diff options
Diffstat (limited to 'drivers/staging')
25 files changed, 0 insertions, 10331 deletions
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig index e3402d5644dd..e25e1e19e7a7 100644 --- a/drivers/staging/Kconfig +++ b/drivers/staging/Kconfig @@ -122,8 +122,6 @@ source "drivers/staging/android/Kconfig" source "drivers/staging/telephony/Kconfig" -source "drivers/staging/ramster/Kconfig" - source "drivers/staging/ozwpan/Kconfig" source "drivers/staging/ccg/Kconfig" diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile index 3be59d02cae4..7ab2d51e50ba 100644 --- a/drivers/staging/Makefile +++ b/drivers/staging/Makefile @@ -54,7 +54,6 @@ obj-$(CONFIG_MFD_NVEC) += nvec/ obj-$(CONFIG_DRM_OMAP) += omapdrm/ obj-$(CONFIG_ANDROID) += android/ obj-$(CONFIG_PHONE) += telephony/ -obj-$(CONFIG_RAMSTER) += ramster/ obj-$(CONFIG_USB_WPAN_HCD) += ozwpan/ obj-$(CONFIG_USB_G_CCG) += ccg/ obj-$(CONFIG_WIMAX_GDM72XX) += gdm72xx/ diff --git a/drivers/staging/ramster/Kconfig b/drivers/staging/ramster/Kconfig deleted file mode 100644 index 8349887827dc..000000000000 --- a/drivers/staging/ramster/Kconfig +++ /dev/null @@ -1,13 +0,0 @@ -config RAMSTER - bool "Cross-machine RAM capacity sharing, aka peer-to-peer tmem" - depends on (CLEANCACHE || FRONTSWAP) && CONFIGFS_FS=y && !ZCACHE && !XVMALLOC && !HIGHMEM && NET - select LZO_COMPRESS - select LZO_DECOMPRESS - default n - help - RAMster allows RAM on other machines in a cluster to be utilized - dynamically and symmetrically instead of swapping to a local swap - disk, thus improving performance on memory-constrained workloads - while minimizing total RAM across the cluster. RAMster, like - zcache, compresses swap pages into local RAM, but then remotifies - the compressed pages to another node in the RAMster cluster. diff --git a/drivers/staging/ramster/Makefile b/drivers/staging/ramster/Makefile deleted file mode 100644 index bcc13c87f996..000000000000 --- a/drivers/staging/ramster/Makefile +++ /dev/null @@ -1 +0,0 @@ -obj-$(CONFIG_RAMSTER) += zcache-main.o tmem.o r2net.o xvmalloc.o cluster/ diff --git a/drivers/staging/ramster/TODO b/drivers/staging/ramster/TODO deleted file mode 100644 index 46fcf0c58acf..000000000000 --- a/drivers/staging/ramster/TODO +++ /dev/null @@ -1,13 +0,0 @@ -For this staging driver, RAMster duplicates code from drivers/staging/zcache -then incorporates changes to the local copy of the code. For V5, it also -directly incorporates the soon-to-be-removed drivers/staging/zram/xvmalloc.[ch] -as all testing has been done with xvmalloc rather than the new zsmalloc. -Before RAMster can be promoted from staging, the zcache and RAMster drivers -should be either merged or reorganized to separate out common code. - -Until V4, RAMster duplicated code from fs/ocfs2/cluster, but this made -RAMster incompatible with ocfs2 running in the same kernel and included -lots of code that could be removed. As of V5, the ocfs2 code has been -mined and made RAMster-specific, made to communicate with a userland -ramster-tools package rather than ocfs2-tools, and can co-exist with ocfs2 -both in the same kernel and in userland on the same machine. diff --git a/drivers/staging/ramster/cluster/Makefile b/drivers/staging/ramster/cluster/Makefile deleted file mode 100644 index 9c6943652c01..000000000000 --- a/drivers/staging/ramster/cluster/Makefile +++ /dev/null @@ -1,3 +0,0 @@ -obj-$(CONFIG_RAMSTER) += ramster_nodemanager.o - -ramster_nodemanager-objs := heartbeat.o masklog.o nodemanager.o tcp.o diff --git a/drivers/staging/ramster/cluster/heartbeat.c b/drivers/staging/ramster/cluster/heartbeat.c deleted file mode 100644 index 00209490756e..000000000000 --- a/drivers/staging/ramster/cluster/heartbeat.c +++ /dev/null @@ -1,464 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * Copyright (C) 2004, 2005, 2012 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/configfs.h> - -#include "heartbeat.h" -#include "tcp.h" -#include "nodemanager.h" - -#include "masklog.h" - -/* - * The first heartbeat pass had one global thread that would serialize all hb - * callback calls. This global serializing sem should only be removed once - * we've made sure that all callees can deal with being called concurrently - * from multiple hb region threads. - */ -static DECLARE_RWSEM(r2hb_callback_sem); - -/* - * multiple hb threads are watching multiple regions. A node is live - * whenever any of the threads sees activity from the node in its region. - */ -static DEFINE_SPINLOCK(r2hb_live_lock); -static unsigned long r2hb_live_node_bitmap[BITS_TO_LONGS(R2NM_MAX_NODES)]; - -static struct r2hb_callback { - struct list_head list; -} r2hb_callbacks[R2HB_NUM_CB]; - -enum r2hb_heartbeat_modes { - R2HB_HEARTBEAT_LOCAL = 0, - R2HB_HEARTBEAT_GLOBAL, - R2HB_HEARTBEAT_NUM_MODES, -}; - -char *r2hb_heartbeat_mode_desc[R2HB_HEARTBEAT_NUM_MODES] = { - "local", /* R2HB_HEARTBEAT_LOCAL */ - "global", /* R2HB_HEARTBEAT_GLOBAL */ -}; - -unsigned int r2hb_dead_threshold = R2HB_DEFAULT_DEAD_THRESHOLD; -unsigned int r2hb_heartbeat_mode = R2HB_HEARTBEAT_LOCAL; - -/* Only sets a new threshold if there are no active regions. - * - * No locking or otherwise interesting code is required for reading - * r2hb_dead_threshold as it can't change once regions are active and - * it's not interesting to anyone until then anyway. */ -static void r2hb_dead_threshold_set(unsigned int threshold) -{ - if (threshold > R2HB_MIN_DEAD_THRESHOLD) { - spin_lock(&r2hb_live_lock); - r2hb_dead_threshold = threshold; - spin_unlock(&r2hb_live_lock); - } -} - -static int r2hb_global_hearbeat_mode_set(unsigned int hb_mode) -{ - int ret = -1; - - if (hb_mode < R2HB_HEARTBEAT_NUM_MODES) { - spin_lock(&r2hb_live_lock); - r2hb_heartbeat_mode = hb_mode; - ret = 0; - spin_unlock(&r2hb_live_lock); - } - - return ret; -} - -void r2hb_exit(void) -{ -} - -int r2hb_init(void) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(r2hb_callbacks); i++) - INIT_LIST_HEAD(&r2hb_callbacks[i].list); - - memset(r2hb_live_node_bitmap, 0, sizeof(r2hb_live_node_bitmap)); - - return 0; -} - -/* if we're already in a callback then we're already serialized by the sem */ -static void r2hb_fill_node_map_from_callback(unsigned long *map, - unsigned bytes) -{ - BUG_ON(bytes < (BITS_TO_LONGS(R2NM_MAX_NODES) * sizeof(unsigned long))); - - memcpy(map, &r2hb_live_node_bitmap, bytes); -} - -/* - * get a map of all nodes that are heartbeating in any regions - */ -void r2hb_fill_node_map(unsigned long *map, unsigned bytes) -{ - /* callers want to serialize this map and callbacks so that they - * can trust that they don't miss nodes coming to the party */ - down_read(&r2hb_callback_sem); - spin_lock(&r2hb_live_lock); - r2hb_fill_node_map_from_callback(map, bytes); - spin_unlock(&r2hb_live_lock); - up_read(&r2hb_callback_sem); -} -EXPORT_SYMBOL_GPL(r2hb_fill_node_map); - -/* - * heartbeat configfs bits. The heartbeat set is a default set under - * the cluster set in nodemanager.c. - */ - -/* heartbeat set */ - -struct r2hb_hb_group { - struct config_group hs_group; - /* some stuff? */ -}; - -static struct r2hb_hb_group *to_r2hb_hb_group(struct config_group *group) -{ - return group ? - container_of(group, struct r2hb_hb_group, hs_group) - : NULL; -} - -static struct config_item r2hb_config_item; - -static struct config_item *r2hb_hb_group_make_item(struct config_group *group, - const char *name) -{ - int ret; - - if (strlen(name) > R2HB_MAX_REGION_NAME_LEN) { - ret = -ENAMETOOLONG; - goto free; - } - - config_item_put(&r2hb_config_item); - - return &r2hb_config_item; -free: - return ERR_PTR(ret); -} - -static void r2hb_hb_group_drop_item(struct config_group *group, - struct config_item *item) -{ - if (r2hb_global_heartbeat_active()) { - printk(KERN_NOTICE "ramster: Heartbeat %s " - "on region %s (%s)\n", - "stopped/aborted", config_item_name(item), - "no region"); - } - - config_item_put(item); -} - -struct r2hb_hb_group_attribute { - struct configfs_attribute attr; - ssize_t (*show)(struct r2hb_hb_group *, char *); - ssize_t (*store)(struct r2hb_hb_group *, const char *, size_t); -}; - -static ssize_t r2hb_hb_group_show(struct config_item *item, - struct configfs_attribute *attr, - char *page) -{ - struct r2hb_hb_group *reg = to_r2hb_hb_group(to_config_group(item)); - struct r2hb_hb_group_attribute *r2hb_hb_group_attr = - container_of(attr, struct r2hb_hb_group_attribute, attr); - ssize_t ret = 0; - - if (r2hb_hb_group_attr->show) - ret = r2hb_hb_group_attr->show(reg, page); - return ret; -} - -static ssize_t r2hb_hb_group_store(struct config_item *item, - struct configfs_attribute *attr, - const char *page, size_t count) -{ - struct r2hb_hb_group *reg = to_r2hb_hb_group(to_config_group(item)); - struct r2hb_hb_group_attribute *r2hb_hb_group_attr = - container_of(attr, struct r2hb_hb_group_attribute, attr); - ssize_t ret = -EINVAL; - - if (r2hb_hb_group_attr->store) - ret = r2hb_hb_group_attr->store(reg, page, count); - return ret; -} - -static ssize_t r2hb_hb_group_threshold_show(struct r2hb_hb_group *group, - char *page) -{ - return sprintf(page, "%u\n", r2hb_dead_threshold); -} - -static ssize_t r2hb_hb_group_threshold_store(struct r2hb_hb_group *group, - const char *page, - size_t count) -{ - unsigned long tmp; - char *p = (char *)page; - int err; - - err = kstrtoul(p, 10, &tmp); - if (err) - return err; - - /* this will validate ranges for us. */ - r2hb_dead_threshold_set((unsigned int) tmp); - - return count; -} - -static -ssize_t r2hb_hb_group_mode_show(struct r2hb_hb_group *group, - char *page) -{ - return sprintf(page, "%s\n", - r2hb_heartbeat_mode_desc[r2hb_heartbeat_mode]); -} - -static -ssize_t r2hb_hb_group_mode_store(struct r2hb_hb_group *group, - const char *page, size_t count) -{ - unsigned int i; - int ret; - size_t len; - - len = (page[count - 1] == '\n') ? count - 1 : count; - if (!len) - return -EINVAL; - - for (i = 0; i < R2HB_HEARTBEAT_NUM_MODES; ++i) { - if (strnicmp(page, r2hb_heartbeat_mode_desc[i], len)) - continue; - - ret = r2hb_global_hearbeat_mode_set(i); - if (!ret) - printk(KERN_NOTICE "ramster: Heartbeat mode " - "set to %s\n", - r2hb_heartbeat_mode_desc[i]); - return count; - } - - return -EINVAL; - -} - -static struct r2hb_hb_group_attribute r2hb_hb_group_attr_threshold = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "dead_threshold", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2hb_hb_group_threshold_show, - .store = r2hb_hb_group_threshold_store, -}; - -static struct r2hb_hb_group_attribute r2hb_hb_group_attr_mode = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "mode", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2hb_hb_group_mode_show, - .store = r2hb_hb_group_mode_store, -}; - -static struct configfs_attribute *r2hb_hb_group_attrs[] = { - &r2hb_hb_group_attr_threshold.attr, - &r2hb_hb_group_attr_mode.attr, - NULL, -}; - -static struct configfs_item_operations r2hb_hearbeat_group_item_ops = { - .show_attribute = r2hb_hb_group_show, - .store_attribute = r2hb_hb_group_store, -}; - -static struct configfs_group_operations r2hb_hb_group_group_ops = { - .make_item = r2hb_hb_group_make_item, - .drop_item = r2hb_hb_group_drop_item, -}; - -static struct config_item_type r2hb_hb_group_type = { - .ct_group_ops = &r2hb_hb_group_group_ops, - .ct_item_ops = &r2hb_hearbeat_group_item_ops, - .ct_attrs = r2hb_hb_group_attrs, - .ct_owner = THIS_MODULE, -}; - -/* this is just here to avoid touching group in heartbeat.h which the - * entire damn world #includes */ -struct config_group *r2hb_alloc_hb_set(void) -{ - struct r2hb_hb_group *hs = NULL; - struct config_group *ret = NULL; - - hs = kzalloc(sizeof(struct r2hb_hb_group), GFP_KERNEL); - if (hs == NULL) - goto out; - - config_group_init_type_name(&hs->hs_group, "heartbeat", - &r2hb_hb_group_type); - - ret = &hs->hs_group; -out: - if (ret == NULL) - kfree(hs); - return ret; -} - -void r2hb_free_hb_set(struct config_group *group) -{ - struct r2hb_hb_group *hs = to_r2hb_hb_group(group); - kfree(hs); -} - -/* hb callback registration and issuing */ - -static struct r2hb_callback *hbcall_from_type(enum r2hb_callback_type type) -{ - if (type == R2HB_NUM_CB) - return ERR_PTR(-EINVAL); - - return &r2hb_callbacks[type]; -} - -void r2hb_setup_callback(struct r2hb_callback_func *hc, - enum r2hb_callback_type type, - r2hb_cb_func *func, - void *data, - int priority) -{ - INIT_LIST_HEAD(&hc->hc_item); - hc->hc_func = func; - hc->hc_data = data; - hc->hc_priority = priority; - hc->hc_type = type; - hc->hc_magic = R2HB_CB_MAGIC; -} -EXPORT_SYMBOL_GPL(r2hb_setup_callback); - -int r2hb_register_callback(const char *region_uuid, - struct r2hb_callback_func *hc) -{ - struct r2hb_callback_func *tmp; - struct list_head *iter; - struct r2hb_callback *hbcall; - int ret; - - BUG_ON(hc->hc_magic != R2HB_CB_MAGIC); - BUG_ON(!list_empty(&hc->hc_item)); - - hbcall = hbcall_from_type(hc->hc_type); - if (IS_ERR(hbcall)) { - ret = PTR_ERR(hbcall); - goto out; - } - - down_write(&r2hb_callback_sem); - - list_for_each(iter, &hbcall->list) { - tmp = list_entry(iter, struct r2hb_callback_func, hc_item); - if (hc->hc_priority < tmp->hc_priority) { - list_add_tail(&hc->hc_item, iter); - break; - } - } - if (list_empty(&hc->hc_item)) - list_add_tail(&hc->hc_item, &hbcall->list); - - up_write(&r2hb_callback_sem); - ret = 0; -out: - mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n", - ret, __builtin_return_address(0), hc); - return ret; -} -EXPORT_SYMBOL_GPL(r2hb_register_callback); - -void r2hb_unregister_callback(const char *region_uuid, - struct r2hb_callback_func *hc) -{ - BUG_ON(hc->hc_magic != R2HB_CB_MAGIC); - - mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n", - __builtin_return_address(0), hc); - - /* XXX Can this happen _with_ a region reference? */ - if (list_empty(&hc->hc_item)) - return; - - down_write(&r2hb_callback_sem); - - list_del_init(&hc->hc_item); - - up_write(&r2hb_callback_sem); -} -EXPORT_SYMBOL_GPL(r2hb_unregister_callback); - -int r2hb_check_node_heartbeating_from_callback(u8 node_num) -{ - unsigned long testing_map[BITS_TO_LONGS(R2NM_MAX_NODES)]; - - r2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); - if (!test_bit(node_num, testing_map)) { - mlog(ML_HEARTBEAT, - "node (%u) does not have heartbeating enabled.\n", - node_num); - return 0; - } - - return 1; -} -EXPORT_SYMBOL_GPL(r2hb_check_node_heartbeating_from_callback); - -void r2hb_stop_all_regions(void) -{ -} -EXPORT_SYMBOL_GPL(r2hb_stop_all_regions); - -/* - * this is just a hack until we get the plumbing which flips file systems - * read only and drops the hb ref instead of killing the node dead. - */ -int r2hb_global_heartbeat_active(void) -{ - return (r2hb_heartbeat_mode == R2HB_HEARTBEAT_GLOBAL); -} -EXPORT_SYMBOL(r2hb_global_heartbeat_active); - -/* added for RAMster */ -void r2hb_manual_set_node_heartbeating(int node_num) -{ - if (node_num < R2NM_MAX_NODES) - set_bit(node_num, r2hb_live_node_bitmap); -} -EXPORT_SYMBOL(r2hb_manual_set_node_heartbeating); diff --git a/drivers/staging/ramster/cluster/heartbeat.h b/drivers/staging/ramster/cluster/heartbeat.h deleted file mode 100644 index 6cbc775bd63b..000000000000 --- a/drivers/staging/ramster/cluster/heartbeat.h +++ /dev/null @@ -1,87 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * heartbeat.h - * - * Function prototypes - * - * Copyright (C) 2004 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - * - */ - -#ifndef R2CLUSTER_HEARTBEAT_H -#define R2CLUSTER_HEARTBEAT_H - -#define R2HB_REGION_TIMEOUT_MS 2000 - -#define R2HB_MAX_REGION_NAME_LEN 32 - -/* number of changes to be seen as live */ -#define R2HB_LIVE_THRESHOLD 2 -/* number of equal samples to be seen as dead */ -extern unsigned int r2hb_dead_threshold; -#define R2HB_DEFAULT_DEAD_THRESHOLD 31 -/* Otherwise MAX_WRITE_TIMEOUT will be zero... */ -#define R2HB_MIN_DEAD_THRESHOLD 2 -#define R2HB_MAX_WRITE_TIMEOUT_MS \ - (R2HB_REGION_TIMEOUT_MS * (r2hb_dead_threshold - 1)) - -#define R2HB_CB_MAGIC 0x51d1e4ec - -/* callback stuff */ -enum r2hb_callback_type { - R2HB_NODE_DOWN_CB = 0, - R2HB_NODE_UP_CB, - R2HB_NUM_CB -}; - -struct r2nm_node; -typedef void (r2hb_cb_func)(struct r2nm_node *, int, void *); - -struct r2hb_callback_func { - u32 hc_magic; - struct list_head hc_item; - r2hb_cb_func *hc_func; - void *hc_data; - int hc_priority; - enum r2hb_callback_type hc_type; -}; - -struct config_group *r2hb_alloc_hb_set(void); -void r2hb_free_hb_set(struct config_group *group); - -void r2hb_setup_callback(struct r2hb_callback_func *hc, - enum r2hb_callback_type type, - r2hb_cb_func *func, - void *data, - int priority); -int r2hb_register_callback(const char *region_uuid, - struct r2hb_callback_func *hc); -void r2hb_unregister_callback(const char *region_uuid, - struct r2hb_callback_func *hc); -void r2hb_fill_node_map(unsigned long *map, - unsigned bytes); -void r2hb_exit(void); -int r2hb_init(void); -int r2hb_check_node_heartbeating_from_callback(u8 node_num); -void r2hb_stop_all_regions(void); -int r2hb_get_all_regions(char *region_uuids, u8 numregions); -int r2hb_global_heartbeat_active(void); -void r2hb_manual_set_node_heartbeating(int); - -#endif /* R2CLUSTER_HEARTBEAT_H */ diff --git a/drivers/staging/ramster/cluster/masklog.c b/drivers/staging/ramster/cluster/masklog.c deleted file mode 100644 index 1261d8579aae..000000000000 --- a/drivers/staging/ramster/cluster/masklog.c +++ /dev/null @@ -1,155 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * Copyright (C) 2004, 2005, 2012 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/proc_fs.h> -#include <linux/seq_file.h> -#include <linux/string.h> -#include <linux/uaccess.h> - -#include "masklog.h" - -struct mlog_bits r2_mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK); -EXPORT_SYMBOL_GPL(r2_mlog_and_bits); -struct mlog_bits r2_mlog_not_bits = MLOG_BITS_RHS(0); -EXPORT_SYMBOL_GPL(r2_mlog_not_bits); - -static ssize_t mlog_mask_show(u64 mask, char *buf) -{ - char *state; - - if (__mlog_test_u64(mask, r2_mlog_and_bits)) - state = "allow"; - else if (__mlog_test_u64(mask, r2_mlog_not_bits)) - state = "deny"; - else - state = "off"; - - return snprintf(buf, PAGE_SIZE, "%s\n", state); -} - -static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count) -{ - if (!strnicmp(buf, "allow", 5)) { - __mlog_set_u64(mask, r2_mlog_and_bits); - __mlog_clear_u64(mask, r2_mlog_not_bits); - } else if (!strnicmp(buf, "deny", 4)) { - __mlog_set_u64(mask, r2_mlog_not_bits); - __mlog_clear_u64(mask, r2_mlog_and_bits); - } else if (!strnicmp(buf, "off", 3)) { - __mlog_clear_u64(mask, r2_mlog_not_bits); - __mlog_clear_u64(mask, r2_mlog_and_bits); - } else - return -EINVAL; - - return count; -} - -struct mlog_attribute { - struct attribute attr; - u64 mask; -}; - -#define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr) - -#define define_mask(_name) { \ - .attr = { \ - .name = #_name, \ - .mode = S_IRUGO | S_IWUSR, \ - }, \ - .mask = ML_##_name, \ -} - -static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = { - define_mask(TCP), - define_mask(MSG), - define_mask(SOCKET), - define_mask(HEARTBEAT), - define_mask(HB_BIO), - define_mask(DLMFS), - define_mask(DLM), - define_mask(DLM_DOMAIN), - define_mask(DLM_THREAD), - define_mask(DLM_MASTER), - define_mask(DLM_RECOVERY), - define_mask(DLM_GLUE), - define_mask(VOTE), - define_mask(CONN), - define_mask(QUORUM), - define_mask(BASTS), - define_mask(CLUSTER), - define_mask(ERROR), - define_mask(NOTICE), - define_mask(KTHREAD), -}; - -static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, }; - -static ssize_t mlog_show(struct kobject *obj, struct attribute *attr, - char *buf) -{ - struct mlog_attribute *mlog_attr = to_mlog_attr(attr); - - return mlog_mask_show(mlog_attr->mask, buf); -} - -static ssize_t mlog_store(struct kobject *obj, struct attribute *attr, - const char *buf, size_t count) -{ - struct mlog_attribute *mlog_attr = to_mlog_attr(attr); - - return mlog_mask_store(mlog_attr->mask, buf, count); -} - -static const struct sysfs_ops mlog_attr_ops = { - .show = mlog_show, - .store = mlog_store, -}; - -static struct kobj_type mlog_ktype = { - .default_attrs = mlog_attr_ptrs, - .sysfs_ops = &mlog_attr_ops, -}; - -static struct kset mlog_kset = { - .kobj = {.ktype = &mlog_ktype}, -}; - -int r2_mlog_sys_init(struct kset *r2cb_kset) -{ - int i = 0; - - while (mlog_attrs[i].attr.mode) { - mlog_attr_ptrs[i] = &mlog_attrs[i].attr; - i++; - } - mlog_attr_ptrs[i] = NULL; - - kobject_set_name(&mlog_kset.kobj, "logmask"); - mlog_kset.kobj.kset = r2cb_kset; - return kset_register(&mlog_kset); -} - -void r2_mlog_sys_shutdown(void) -{ - kset_unregister(&mlog_kset); -} diff --git a/drivers/staging/ramster/cluster/masklog.h b/drivers/staging/ramster/cluster/masklog.h deleted file mode 100644 index 918ae110b699..000000000000 --- a/drivers/staging/ramster/cluster/masklog.h +++ /dev/null @@ -1,220 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * Copyright (C) 2005, 2012 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ - -#ifndef R2CLUSTER_MASKLOG_H -#define R2CLUSTER_MASKLOG_H - -/* - * For now this is a trivial wrapper around printk() that gives the critical - * ability to enable sets of debugging output at run-time. In the future this - * will almost certainly be redirected to relayfs so that it can pay a - * substantially lower heisenberg tax. - * - * Callers associate the message with a bitmask and a global bitmask is - * maintained with help from /proc. If any of the bits match the message is - * output. - * - * We must have efficient bit tests on i386 and it seems gcc still emits crazy - * code for the 64bit compare. It emits very good code for the dual unsigned - * long tests, though, completely avoiding tests that can never pass if the - * caller gives a constant bitmask that fills one of the longs with all 0s. So - * the desire is to have almost all of the calls decided on by comparing just - * one of the longs. This leads to having infrequently given bits that are - * frequently matched in the high bits. - * - * _ERROR and _NOTICE are used for messages that always go to the console and - * have appropriate KERN_ prefixes. We wrap these in our function instead of - * just calling printk() so that this can eventually make its way through - * relayfs along with the debugging messages. Everything else gets KERN_DEBUG. - * The inline tests and macro dance give GCC the opportunity to quite cleverly - * only emit the appropriage printk() when the caller passes in a constant - * mask, as is almost always the case. - * - * All this bitmask nonsense is managed from the files under - * /sys/fs/r2cb/logmask/. Reading the files gives a straightforward - * indication of which bits are allowed (allow) or denied (off/deny). - * ENTRY deny - * EXIT deny - * TCP off - * MSG off - * SOCKET off - * ERROR allow - * NOTICE allow - * - * Writing changes the state of a given bit and requires a strictly formatted - * single write() call: - * - * write(fd, "allow", 5); - * - * Echoing allow/deny/off string into the logmask files can flip the bits - * on or off as expected; here is the bash script for example: - * - * log_mask="/sys/fs/r2cb/log_mask" - * for node in ENTRY EXIT TCP MSG SOCKET ERROR NOTICE; do - * echo allow >"$log_mask"/"$node" - * done - * - * The debugfs.ramster tool can also flip the bits with the -l option: - * - * debugfs.ramster -l TCP allow - */ - -/* for task_struct */ -#include <linux/sched.h> - -/* bits that are frequently given and infrequently matched in the low word */ -/* NOTE: If you add a flag, you need to also update masklog.c! */ -#define ML_TCP 0x0000000000000001ULL /* net cluster/tcp.c */ -#define ML_MSG 0x0000000000000002ULL /* net network messages */ -#define ML_SOCKET 0x0000000000000004ULL /* net socket lifetime */ -#define ML_HEARTBEAT 0x0000000000000008ULL /* hb all heartbeat tracking */ -#define ML_HB_BIO 0x0000000000000010ULL /* hb io tracing */ -#define ML_DLMFS 0x0000000000000020ULL /* dlm user dlmfs */ -#define ML_DLM 0x0000000000000040ULL /* dlm general debugging */ -#define ML_DLM_DOMAIN 0x0000000000000080ULL /* dlm domain debugging */ -#define ML_DLM_THREAD 0x0000000000000100ULL /* dlm domain thread */ -#define ML_DLM_MASTER 0x0000000000000200ULL /* dlm master functions */ -#define ML_DLM_RECOVERY 0x0000000000000400ULL /* dlm master functions */ -#define ML_DLM_GLUE 0x0000000000000800ULL /* ramster dlm glue layer */ -#define ML_VOTE 0x0000000000001000ULL /* ramster node messaging */ -#define ML_CONN 0x0000000000002000ULL /* net connection management */ -#define ML_QUORUM 0x0000000000004000ULL /* net connection quorum */ -#define ML_BASTS 0x0000000000008000ULL /* dlmglue asts and basts */ -#define ML_CLUSTER 0x0000000000010000ULL /* cluster stack */ - -/* bits that are infrequently given and frequently matched in the high word */ -#define ML_ERROR 0x1000000000000000ULL /* sent to KERN_ERR */ -#define ML_NOTICE 0x2000000000000000ULL /* setn to KERN_NOTICE */ -#define ML_KTHREAD 0x4000000000000000ULL /* kernel thread activity */ - -#define MLOG_INITIAL_AND_MASK (ML_ERROR|ML_NOTICE) -#ifndef MLOG_MASK_PREFIX -#define MLOG_MASK_PREFIX 0 -#endif - -/* - * When logging is disabled, force the bit test to 0 for anything other - * than errors and notices, allowing gcc to remove the code completely. - * When enabled, allow all masks. - */ -#if defined(CONFIG_RAMSTER_DEBUG_MASKLOG) -#define ML_ALLOWED_BITS (~0) -#else -#define ML_ALLOWED_BITS (ML_ERROR|ML_NOTICE) -#endif - -#define MLOG_MAX_BITS 64 - -struct mlog_bits { - unsigned long words[MLOG_MAX_BITS / BITS_PER_LONG]; -}; - -extern struct mlog_bits r2_mlog_and_bits, r2_mlog_not_bits; - -#if BITS_PER_LONG == 32 - -#define __mlog_test_u64(mask, bits) \ - ((u32)(mask & 0xffffffff) & bits.words[0] || \ - ((u64)(mask) >> 32) & bits.words[1]) -#define __mlog_set_u64(mask, bits) do { \ - bits.words[0] |= (u32)(mask & 0xffffffff); \ - bits.words[1] |= (u64)(mask) >> 32; \ -} while (0) -#define __mlog_clear_u64(mask, bits) do { \ - bits.words[0] &= ~((u32)(mask & 0xffffffff)); \ - bits.words[1] &= ~((u64)(mask) >> 32); \ -} while (0) -#define MLOG_BITS_RHS(mask) { \ - { \ - [0] = (u32)(mask & 0xffffffff), \ - [1] = (u64)(mask) >> 32, \ - } \ -} - -#else /* 32bit long above, 64bit long below */ - -#define __mlog_test_u64(mask, bits) ((mask) & bits.words[0]) -#define __mlog_set_u64(mask, bits) do { \ - bits.words[0] |= (mask); \ -} while (0) -#define __mlog_clear_u64(mask, bits) do { \ - bits.words[0] &= ~(mask); \ -} while (0) -#define MLOG_BITS_RHS(mask) { { (mask) } } - -#endif - -/* - * smp_processor_id() "helpfully" screams when called outside preemptible - * regions in current kernels. sles doesn't have the variants that don't - * scream. just do this instead of trying to guess which we're building - * against.. *sigh*. - */ -#define __mlog_cpu_guess ({ \ - unsigned long _cpu = get_cpu(); \ - put_cpu(); \ - _cpu; \ -}) - -/* In the following two macros, the whitespace after the ',' just - * before ##args is intentional. Otherwise, gcc 2.95 will eat the - * previous token if args expands to nothing. - */ -#define __mlog_printk(level, fmt, args...) \ - printk(level "(%s,%u,%lu):%s:%d " fmt, current->comm, \ - task_pid_nr(current), __mlog_cpu_guess, \ - __PRETTY_FUNCTION__, __LINE__ , ##args) - -#define mlog(mask, fmt, args...) do { \ - u64 __m = MLOG_MASK_PREFIX | (mask); \ - if ((__m & ML_ALLOWED_BITS) && \ - __mlog_test_u64(__m, r2_mlog_and_bits) && \ - !__mlog_test_u64(__m, r2_mlog_not_bits)) { \ - if (__m & ML_ERROR) \ - __mlog_printk(KERN_ERR, "ERROR: "fmt , ##args); \ - else if (__m & ML_NOTICE) \ - __mlog_printk(KERN_NOTICE, fmt , ##args); \ - else \ - __mlog_printk(KERN_INFO, fmt , ##args); \ - } \ -} while (0) - -#define mlog_errno(st) do { \ - int _st = (st); \ - if (_st != -ERESTARTSYS && _st != -EINTR && \ - _st != AOP_TRUNCATED_PAGE && _st != -ENOSPC) \ - mlog(ML_ERROR, "status = %lld\n", (long long)_st); \ -} while (0) - -#define mlog_bug_on_msg(cond, fmt, args...) do { \ - if (cond) { \ - mlog(ML_ERROR, "bug expression: " #cond "\n"); \ - mlog(ML_ERROR, fmt, ##args); \ - BUG(); \ - } \ -} while (0) - -#include <linux/kobject.h> -#include <linux/sysfs.h> -int r2_mlog_sys_init(struct kset *r2cb_subsys); -void r2_mlog_sys_shutdown(void); - -#endif /* R2CLUSTER_MASKLOG_H */ diff --git a/drivers/staging/ramster/cluster/nodemanager.c b/drivers/staging/ramster/cluster/nodemanager.c deleted file mode 100644 index de0e5c8da6ea..000000000000 --- a/drivers/staging/ramster/cluster/nodemanager.c +++ /dev/null @@ -1,992 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * Copyright (C) 2004, 2005, 2012 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ - -#include <linux/slab.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/configfs.h> - -#include "tcp.h" -#include "nodemanager.h" -#include "heartbeat.h" -#include "masklog.h" - -/* for now we operate under the assertion that there can be only one - * cluster active at a time. Changing this will require trickling - * cluster references throughout where nodes are looked up */ -struct r2nm_cluster *r2nm_single_cluster; - -char *r2nm_fence_method_desc[R2NM_FENCE_METHODS] = { - "reset", /* R2NM_FENCE_RESET */ - "panic", /* R2NM_FENCE_PANIC */ -}; - -struct r2nm_node *r2nm_get_node_by_num(u8 node_num) -{ - struct r2nm_node *node = NULL; - - if (node_num >= R2NM_MAX_NODES || r2nm_single_cluster == NULL) - goto out; - - read_lock(&r2nm_single_cluster->cl_nodes_lock); - node = r2nm_single_cluster->cl_nodes[node_num]; - if (node) - config_item_get(&node->nd_item); - read_unlock(&r2nm_single_cluster->cl_nodes_lock); -out: - return node; -} -EXPORT_SYMBOL_GPL(r2nm_get_node_by_num); - -int r2nm_configured_node_map(unsigned long *map, unsigned bytes) -{ - struct r2nm_cluster *cluster = r2nm_single_cluster; - - BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap))); - - if (cluster == NULL) - return -EINVAL; - - read_lock(&cluster->cl_nodes_lock); - memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap)); - read_unlock(&cluster->cl_nodes_lock); - - return 0; -} -EXPORT_SYMBOL_GPL(r2nm_configured_node_map); - -static struct r2nm_node *r2nm_node_ip_tree_lookup(struct r2nm_cluster *cluster, - __be32 ip_needle, - struct rb_node ***ret_p, - struct rb_node **ret_parent) -{ - struct rb_node **p = &cluster->cl_node_ip_tree.rb_node; - struct rb_node *parent = NULL; - struct r2nm_node *node, *ret = NULL; - - while (*p) { - int cmp; - - parent = *p; - node = rb_entry(parent, struct r2nm_node, nd_ip_node); - - cmp = memcmp(&ip_needle, &node->nd_ipv4_address, - sizeof(ip_needle)); - if (cmp < 0) - p = &(*p)->rb_left; - else if (cmp > 0) - p = &(*p)->rb_right; - else { - ret = node; - break; - } - } - - if (ret_p != NULL) - *ret_p = p; - if (ret_parent != NULL) - *ret_parent = parent; - - return ret; -} - -struct r2nm_node *r2nm_get_node_by_ip(__be32 addr) -{ - struct r2nm_node *node = NULL; - struct r2nm_cluster *cluster = r2nm_single_cluster; - - if (cluster == NULL) - goto out; - - read_lock(&cluster->cl_nodes_lock); - node = r2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL); - if (node) - config_item_get(&node->nd_item); - read_unlock(&cluster->cl_nodes_lock); - -out: - return node; -} -EXPORT_SYMBOL_GPL(r2nm_get_node_by_ip); - -void r2nm_node_put(struct r2nm_node *node) -{ - config_item_put(&node->nd_item); -} -EXPORT_SYMBOL_GPL(r2nm_node_put); - -void r2nm_node_get(struct r2nm_node *node) -{ - config_item_get(&node->nd_item); -} -EXPORT_SYMBOL_GPL(r2nm_node_get); - -u8 r2nm_this_node(void) -{ - u8 node_num = R2NM_MAX_NODES; - - if (r2nm_single_cluster && r2nm_single_cluster->cl_has_local) - node_num = r2nm_single_cluster->cl_local_node; - - return node_num; -} -EXPORT_SYMBOL_GPL(r2nm_this_node); - -/* node configfs bits */ - -static struct r2nm_cluster *to_r2nm_cluster(struct config_item *item) -{ - return item ? - container_of(to_config_group(item), struct r2nm_cluster, - cl_group) - : NULL; -} - -static struct r2nm_node *to_r2nm_node(struct config_item *item) -{ - return item ? container_of(item, struct r2nm_node, nd_item) : NULL; -} - -static void r2nm_node_release(struct config_item *item) -{ - struct r2nm_node *node = to_r2nm_node(item); - kfree(node); -} - -static ssize_t r2nm_node_num_read(struct r2nm_node *node, char *page) -{ - return sprintf(page, "%d\n", node->nd_num); -} - -static struct r2nm_cluster *to_r2nm_cluster_from_node(struct r2nm_node *node) -{ - /* through the first node_set .parent - * mycluster/nodes/mynode == r2nm_cluster->r2nm_node_group->r2nm_node */ - return to_r2nm_cluster(node->nd_item.ci_parent->ci_parent); -} - -enum { - R2NM_NODE_ATTR_NUM = 0, - R2NM_NODE_ATTR_PORT, - R2NM_NODE_ATTR_ADDRESS, - R2NM_NODE_ATTR_LOCAL, -}; - -static ssize_t r2nm_node_num_write(struct r2nm_node *node, const char *page, - size_t count) -{ - struct r2nm_cluster *cluster = to_r2nm_cluster_from_node(node); - unsigned long tmp; - char *p = (char *)page; - int err; - - err = kstrtoul(p, 10, &tmp); - if (err) - return err; - - if (tmp >= R2NM_MAX_NODES) - return -ERANGE; - - /* once we're in the cl_nodes tree networking can look us up by - * node number and try to use our address and port attributes - * to connect to this node.. make sure that they've been set - * before writing the node attribute? */ - if (!test_bit(R2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) || - !test_bit(R2NM_NODE_ATTR_PORT, &node->nd_set_attributes)) - return -EINVAL; /* XXX */ - - write_lock(&cluster->cl_nodes_lock); - if (cluster->cl_nodes[tmp]) - p = NULL; - else { - cluster->cl_nodes[tmp] = node; - node->nd_num = tmp; - set_bit(tmp, cluster->cl_nodes_bitmap); - } - write_unlock(&cluster->cl_nodes_lock); - if (p == NULL) - return -EEXIST; - - return count; -} -static ssize_t r2nm_node_ipv4_port_read(struct r2nm_node *node, char *page) -{ - return sprintf(page, "%u\n", ntohs(node->nd_ipv4_port)); -} - -static ssize_t r2nm_node_ipv4_port_write(struct r2nm_node *node, - const char *page, size_t count) -{ - unsigned long tmp; - char *p = (char *)page; - int err; - - err = kstrtoul(p, 10, &tmp); - if (err) - return err; - - if (tmp == 0) - return -EINVAL; - if (tmp >= (u16)-1) - return -ERANGE; - - node->nd_ipv4_port = htons(tmp); - - return count; -} - -static ssize_t r2nm_node_ipv4_address_read(struct r2nm_node *node, char *page) -{ - return sprintf(page, "%pI4\n", &node->nd_ipv4_address); -} - -static ssize_t r2nm_node_ipv4_address_write(struct r2nm_node *node, - const char *page, - size_t count) -{ - struct r2nm_cluster *cluster = to_r2nm_cluster_from_node(node); - int ret, i; - struct rb_node **p, *parent; - unsigned int octets[4]; - __be32 ipv4_addr = 0; - - ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2], - &octets[1], &octets[0]); - if (ret != 4) - return -EINVAL; - - for (i = 0; i < ARRAY_SIZE(octets); i++) { - if (octets[i] > 255) - return -ERANGE; - be32_add_cpu(&ipv4_addr, octets[i] << (i * 8)); - } - - ret = 0; - write_lock(&cluster->cl_nodes_lock); - if (r2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent)) - ret = -EEXIST; - else { - rb_link_node(&node->nd_ip_node, parent, p); - rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree); - } - write_unlock(&cluster->cl_nodes_lock); - if (ret) - return ret; - - memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr)); - - return count; -} - -static ssize_t r2nm_node_local_read(struct r2nm_node *node, char *page) -{ - return sprintf(page, "%d\n", node->nd_local); -} - -static ssize_t r2nm_node_local_write(struct r2nm_node *node, const char *page, - size_t count) -{ - struct r2nm_cluster *cluster = to_r2nm_cluster_from_node(node); - unsigned long tmp; - char *p = (char *)page; - ssize_t ret; - int err; - - err = kstrtoul(p, 10, &tmp); - if (err) - return err; - - tmp = !!tmp; /* boolean of whether this node wants to be local */ - - /* setting local turns on networking rx for now so we require having - * set everything else first */ - if (!test_bit(R2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) || - !test_bit(R2NM_NODE_ATTR_NUM, &node->nd_set_attributes) || - !test_bit(R2NM_NODE_ATTR_PORT, &node->nd_set_attributes)) - return -EINVAL; /* XXX */ - - /* the only failure case is trying to set a new local node - * when a different one is already set */ - if (tmp && tmp == cluster->cl_has_local && - cluster->cl_local_node != node->nd_num) - return -EBUSY; - - /* bring up the rx thread if we're setting the new local node. */ - if (tmp && !cluster->cl_has_local) { - ret = r2net_start_listening(node); - if (ret) - return ret; - } - - if (!tmp && cluster->cl_has_local && - cluster->cl_local_node == node->nd_num) { - r2net_stop_listening(node); - cluster->cl_local_node = R2NM_INVALID_NODE_NUM; - } - - node->nd_local = tmp; - if (node->nd_local) { - cluster->cl_has_local = tmp; - cluster->cl_local_node = node->nd_num; - } - - return count; -} - -struct r2nm_node_attribute { - struct configfs_attribute attr; - ssize_t (*show)(struct r2nm_node *, char *); - ssize_t (*store)(struct r2nm_node *, const char *, size_t); -}; - -static struct r2nm_node_attribute r2nm_node_attr_num = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "num", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2nm_node_num_read, - .store = r2nm_node_num_write, -}; - -static struct r2nm_node_attribute r2nm_node_attr_ipv4_port = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "ipv4_port", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2nm_node_ipv4_port_read, - .store = r2nm_node_ipv4_port_write, -}; - -static struct r2nm_node_attribute r2nm_node_attr_ipv4_address = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "ipv4_address", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2nm_node_ipv4_address_read, - .store = r2nm_node_ipv4_address_write, -}; - -static struct r2nm_node_attribute r2nm_node_attr_local = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "local", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2nm_node_local_read, - .store = r2nm_node_local_write, -}; - -static struct configfs_attribute *r2nm_node_attrs[] = { - [R2NM_NODE_ATTR_NUM] = &r2nm_node_attr_num.attr, - [R2NM_NODE_ATTR_PORT] = &r2nm_node_attr_ipv4_port.attr, - [R2NM_NODE_ATTR_ADDRESS] = &r2nm_node_attr_ipv4_address.attr, - [R2NM_NODE_ATTR_LOCAL] = &r2nm_node_attr_local.attr, - NULL, -}; - -static int r2nm_attr_index(struct configfs_attribute *attr) -{ - int i; - for (i = 0; i < ARRAY_SIZE(r2nm_node_attrs); i++) { - if (attr == r2nm_node_attrs[i]) - return i; - } - BUG(); - return 0; -} - -static ssize_t r2nm_node_show(struct config_item *item, - struct configfs_attribute *attr, - char *page) -{ - struct r2nm_node *node = to_r2nm_node(item); - struct r2nm_node_attribute *r2nm_node_attr = - container_of(attr, struct r2nm_node_attribute, attr); - ssize_t ret = 0; - - if (r2nm_node_attr->show) - ret = r2nm_node_attr->show(node, page); - return ret; -} - -static ssize_t r2nm_node_store(struct config_item *item, - struct configfs_attribute *attr, - const char *page, size_t count) -{ - struct r2nm_node *node = to_r2nm_node(item); - struct r2nm_node_attribute *r2nm_node_attr = - container_of(attr, struct r2nm_node_attribute, attr); - ssize_t ret; - int attr_index = r2nm_attr_index(attr); - - if (r2nm_node_attr->store == NULL) { - ret = -EINVAL; - goto out; - } - - if (test_bit(attr_index, &node->nd_set_attributes)) - return -EBUSY; - - ret = r2nm_node_attr->store(node, page, count); - if (ret < count) - goto out; - - set_bit(attr_index, &node->nd_set_attributes); -out: - return ret; -} - -static struct configfs_item_operations r2nm_node_item_ops = { - .release = r2nm_node_release, - .show_attribute = r2nm_node_show, - .store_attribute = r2nm_node_store, -}; - -static struct config_item_type r2nm_node_type = { - .ct_item_ops = &r2nm_node_item_ops, - .ct_attrs = r2nm_node_attrs, - .ct_owner = THIS_MODULE, -}; - -/* node set */ - -struct r2nm_node_group { - struct config_group ns_group; - /* some stuff? */ -}; - -#if 0 -static struct r2nm_node_group *to_r2nm_node_group(struct config_group *group) -{ - return group ? - container_of(group, struct r2nm_node_group, ns_group) - : NULL; -} -#endif - -struct r2nm_cluster_attribute { - struct configfs_attribute attr; - ssize_t (*show)(struct r2nm_cluster *, char *); - ssize_t (*store)(struct r2nm_cluster *, const char *, size_t); -}; - -static ssize_t r2nm_cluster_attr_write(const char *page, ssize_t count, - unsigned int *val) -{ - unsigned long tmp; - char *p = (char *)page; - int err; - - err = kstrtoul(p, 10, &tmp); - if (err) - return err; - - if (tmp == 0) - return -EINVAL; - if (tmp >= (u32)-1) - return -ERANGE; - - *val = tmp; - - return count; -} - -static ssize_t r2nm_cluster_attr_idle_timeout_ms_read( - struct r2nm_cluster *cluster, char *page) -{ - return sprintf(page, "%u\n", cluster->cl_idle_timeout_ms); -} - -static ssize_t r2nm_cluster_attr_idle_timeout_ms_write( - struct r2nm_cluster *cluster, const char *page, size_t count) -{ - ssize_t ret; - unsigned int val = 0; - - ret = r2nm_cluster_attr_write(page, count, &val); - - if (ret > 0) { - if (cluster->cl_idle_timeout_ms != val - && r2net_num_connected_peers()) { - mlog(ML_NOTICE, - "r2net: cannot change idle timeout after " - "the first peer has agreed to it." - " %d connected peers\n", - r2net_num_connected_peers()); - ret = -EINVAL; - } else if (val <= cluster->cl_keepalive_delay_ms) { - mlog(ML_NOTICE, "r2net: idle timeout must be larger " - "than keepalive delay\n"); - ret = -EINVAL; - } else { - cluster->cl_idle_timeout_ms = val; - } - } - - return ret; -} - -static ssize_t r2nm_cluster_attr_keepalive_delay_ms_read( - struct r2nm_cluster *cluster, char *page) -{ - return sprintf(page, "%u\n", cluster->cl_keepalive_delay_ms); -} - -static ssize_t r2nm_cluster_attr_keepalive_delay_ms_write( - struct r2nm_cluster *cluster, const char *page, size_t count) -{ - ssize_t ret; - unsigned int val = 0; - - ret = r2nm_cluster_attr_write(page, count, &val); - - if (ret > 0) { - if (cluster->cl_keepalive_delay_ms != val - && r2net_num_connected_peers()) { - mlog(ML_NOTICE, - "r2net: cannot change keepalive delay after" - " the first peer has agreed to it." - " %d connected peers\n", - r2net_num_connected_peers()); - ret = -EINVAL; - } else if (val >= cluster->cl_idle_timeout_ms) { - mlog(ML_NOTICE, "r2net: keepalive delay must be " - "smaller than idle timeout\n"); - ret = -EINVAL; - } else { - cluster->cl_keepalive_delay_ms = val; - } - } - - return ret; -} - -static ssize_t r2nm_cluster_attr_reconnect_delay_ms_read( - struct r2nm_cluster *cluster, char *page) -{ - return sprintf(page, "%u\n", cluster->cl_reconnect_delay_ms); -} - -static ssize_t r2nm_cluster_attr_reconnect_delay_ms_write( - struct r2nm_cluster *cluster, const char *page, size_t count) -{ - return r2nm_cluster_attr_write(page, count, - &cluster->cl_reconnect_delay_ms); -} - -static ssize_t r2nm_cluster_attr_fence_method_read( - struct r2nm_cluster *cluster, char *page) -{ - ssize_t ret = 0; - - if (cluster) - ret = sprintf(page, "%s\n", - r2nm_fence_method_desc[cluster->cl_fence_method]); - return ret; -} - -static ssize_t r2nm_cluster_attr_fence_method_write( - struct r2nm_cluster *cluster, const char *page, size_t count) -{ - unsigned int i; - - if (page[count - 1] != '\n') - goto bail; - - for (i = 0; i < R2NM_FENCE_METHODS; ++i) { - if (count != strlen(r2nm_fence_method_desc[i]) + 1) - continue; - if (strncasecmp(page, r2nm_fence_method_desc[i], count - 1)) - continue; - if (cluster->cl_fence_method != i) { - printk(KERN_INFO "ramster: Changing fence method to %s\n", - r2nm_fence_method_desc[i]); - cluster->cl_fence_method = i; - } - return count; - } - -bail: - return -EINVAL; -} - -static struct r2nm_cluster_attribute r2nm_cluster_attr_idle_timeout_ms = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "idle_timeout_ms", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2nm_cluster_attr_idle_timeout_ms_read, - .store = r2nm_cluster_attr_idle_timeout_ms_write, -}; - -static struct r2nm_cluster_attribute r2nm_cluster_attr_keepalive_delay_ms = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "keepalive_delay_ms", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2nm_cluster_attr_keepalive_delay_ms_read, - .store = r2nm_cluster_attr_keepalive_delay_ms_write, -}; - -static struct r2nm_cluster_attribute r2nm_cluster_attr_reconnect_delay_ms = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "reconnect_delay_ms", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2nm_cluster_attr_reconnect_delay_ms_read, - .store = r2nm_cluster_attr_reconnect_delay_ms_write, -}; - -static struct r2nm_cluster_attribute r2nm_cluster_attr_fence_method = { - .attr = { .ca_owner = THIS_MODULE, - .ca_name = "fence_method", - .ca_mode = S_IRUGO | S_IWUSR }, - .show = r2nm_cluster_attr_fence_method_read, - .store = r2nm_cluster_attr_fence_method_write, -}; - -static struct configfs_attribute *r2nm_cluster_attrs[] = { - &r2nm_cluster_attr_idle_timeout_ms.attr, - &r2nm_cluster_attr_keepalive_delay_ms.attr, - &r2nm_cluster_attr_reconnect_delay_ms.attr, - &r2nm_cluster_attr_fence_method.attr, - NULL, -}; -static ssize_t r2nm_cluster_show(struct config_item *item, - struct configfs_attribute *attr, - char *page) -{ - struct r2nm_cluster *cluster = to_r2nm_cluster(item); - struct r2nm_cluster_attribute *r2nm_cluster_attr = - container_of(attr, struct r2nm_cluster_attribute, attr); - ssize_t ret = 0; - - if (r2nm_cluster_attr->show) - ret = r2nm_cluster_attr->show(cluster, page); - return ret; -} - -static ssize_t r2nm_cluster_store(struct config_item *item, - struct configfs_attribute *attr, - const char *page, size_t count) -{ - struct r2nm_cluster *cluster = to_r2nm_cluster(item); - struct r2nm_cluster_attribute *r2nm_cluster_attr = - container_of(attr, struct r2nm_cluster_attribute, attr); - ssize_t ret; - - if (r2nm_cluster_attr->store == NULL) { - ret = -EINVAL; - goto out; - } - - ret = r2nm_cluster_attr->store(cluster, page, count); - if (ret < count) - goto out; -out: - return ret; -} - -static struct config_item *r2nm_node_group_make_item(struct config_group *group, - const char *name) -{ - struct r2nm_node *node = NULL; - - if (strlen(name) > R2NM_MAX_NAME_LEN) - return ERR_PTR(-ENAMETOOLONG); - - node = kzalloc(sizeof(struct r2nm_node), GFP_KERNEL); - if (node == NULL) - return ERR_PTR(-ENOMEM); - - strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */ - config_item_init_type_name(&node->nd_item, name, &r2nm_node_type); - spin_lock_init(&node->nd_lock); - - mlog(ML_CLUSTER, "r2nm: Registering node %s\n", name); - - return &node->nd_item; -} - -static void r2nm_node_group_drop_item(struct config_group *group, - struct config_item *item) -{ - struct r2nm_node *node = to_r2nm_node(item); - struct r2nm_cluster *cluster = - to_r2nm_cluster(group->cg_item.ci_parent); - - r2net_disconnect_node(node); - - if (cluster->cl_has_local && - (cluster->cl_local_node == node->nd_num)) { - cluster->cl_has_local = 0; - cluster->cl_local_node = R2NM_INVALID_NODE_NUM; - r2net_stop_listening(node); - } - - /* XXX call into net to stop this node from trading messages */ - - write_lock(&cluster->cl_nodes_lock); - - /* XXX sloppy */ - if (node->nd_ipv4_address) - rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree); - - /* nd_num might be 0 if the node number hasn't been set.. */ - if (cluster->cl_nodes[node->nd_num] == node) { - cluster->cl_nodes[node->nd_num] = NULL; - clear_bit(node->nd_num, cluster->cl_nodes_bitmap); - } - write_unlock(&cluster->cl_nodes_lock); - - mlog(ML_CLUSTER, "r2nm: Unregistered node %s\n", - config_item_name(&node->nd_item)); - - config_item_put(item); -} - -static struct configfs_group_operations r2nm_node_group_group_ops = { - .make_item = r2nm_node_group_make_item, - .drop_item = r2nm_node_group_drop_item, -}; - -static struct config_item_type r2nm_node_group_type = { - .ct_group_ops = &r2nm_node_group_group_ops, - .ct_owner = THIS_MODULE, -}; - -/* cluster */ - -static void r2nm_cluster_release(struct config_item *item) -{ - struct r2nm_cluster *cluster = to_r2nm_cluster(item); - - kfree(cluster->cl_group.default_groups); - kfree(cluster); -} - -static struct configfs_item_operations r2nm_cluster_item_ops = { - .release = r2nm_cluster_release, - .show_attribute = r2nm_cluster_show, - .store_attribute = r2nm_cluster_store, -}; - -static struct config_item_type r2nm_cluster_type = { - .ct_item_ops = &r2nm_cluster_item_ops, - .ct_attrs = r2nm_cluster_attrs, - .ct_owner = THIS_MODULE, -}; - -/* cluster set */ - -struct r2nm_cluster_group { - struct configfs_subsystem cs_subsys; - /* some stuff? */ -}; - -#if 0 -static struct r2nm_cluster_group * -to_r2nm_cluster_group(struct config_group *group) -{ - return group ? - container_of(to_configfs_subsystem(group), - struct r2nm_cluster_group, cs_subsys) - : NULL; -} -#endif - -static struct config_group * -r2nm_cluster_group_make_group(struct config_group *group, - const char *name) -{ - struct r2nm_cluster *cluster = NULL; - struct r2nm_node_group *ns = NULL; - struct config_group *r2hb_group = NULL, *ret = NULL; - void *defs = NULL; - - /* this runs under the parent dir's i_mutex; there can be only - * one caller in here at a time */ - if (r2nm_single_cluster) - return ERR_PTR(-ENOSPC); - - cluster = kzalloc(sizeof(struct r2nm_cluster), GFP_KERNEL); - ns = kzalloc(sizeof(struct r2nm_node_group), GFP_KERNEL); - defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL); - r2hb_group = r2hb_alloc_hb_set(); - if (cluster == NULL || ns == NULL || r2hb_group == NULL || defs == NULL) - goto out; - - config_group_init_type_name(&cluster->cl_group, name, - &r2nm_cluster_type); - config_group_init_type_name(&ns->ns_group, "node", - &r2nm_node_group_type); - - cluster->cl_group.default_groups = defs; - cluster->cl_group.default_groups[0] = &ns->ns_group; - cluster->cl_group.default_groups[1] = r2hb_group; - cluster->cl_group.default_groups[2] = NULL; - rwlock_init(&cluster->cl_nodes_lock); - cluster->cl_node_ip_tree = RB_ROOT; - cluster->cl_reconnect_delay_ms = R2NET_RECONNECT_DELAY_MS_DEFAULT; - cluster->cl_idle_timeout_ms = R2NET_IDLE_TIMEOUT_MS_DEFAULT; - cluster->cl_keepalive_delay_ms = R2NET_KEEPALIVE_DELAY_MS_DEFAULT; - cluster->cl_fence_method = R2NM_FENCE_RESET; - - ret = &cluster->cl_group; - r2nm_single_cluster = cluster; - -out: - if (ret == NULL) { - kfree(cluster); - kfree(ns); - r2hb_free_hb_set(r2hb_group); - kfree(defs); - ret = ERR_PTR(-ENOMEM); - } - - return ret; -} - -static void r2nm_cluster_group_drop_item(struct config_group *group, - struct config_item *item) -{ - struct r2nm_cluster *cluster = to_r2nm_cluster(item); - int i; - struct config_item *killme; - - BUG_ON(r2nm_single_cluster != cluster); - r2nm_single_cluster = NULL; - - for (i = 0; cluster->cl_group.default_groups[i]; i++) { - killme = &cluster->cl_group.default_groups[i]->cg_item; - cluster->cl_group.default_groups[i] = NULL; - config_item_put(killme); - } - - config_item_put(item); -} - -static struct configfs_group_operations r2nm_cluster_group_group_ops = { - .make_group = r2nm_cluster_group_make_group, - .drop_item = r2nm_cluster_group_drop_item, -}; - -static struct config_item_type r2nm_cluster_group_type = { - .ct_group_ops = &r2nm_cluster_group_group_ops, - .ct_owner = THIS_MODULE, -}; - -static struct r2nm_cluster_group r2nm_cluster_group = { - .cs_subsys = { - .su_group = { - .cg_item = { - .ci_namebuf = "cluster", - .ci_type = &r2nm_cluster_group_type, - }, - }, - }, -}; - -int r2nm_depend_item(struct config_item *item) -{ - return configfs_depend_item(&r2nm_cluster_group.cs_subsys, item); -} - -void r2nm_undepend_item(struct config_item *item) -{ - configfs_undepend_item(&r2nm_cluster_group.cs_subsys, item); -} - -int r2nm_depend_this_node(void) -{ - int ret = 0; - struct r2nm_node *local_node; - - local_node = r2nm_get_node_by_num(r2nm_this_node()); - if (!local_node) { - ret = -EINVAL; - goto out; - } - - ret = r2nm_depend_item(&local_node->nd_item); - r2nm_node_put(local_node); - -out: - return ret; -} - -void r2nm_undepend_this_node(void) -{ - struct r2nm_node *local_node; - - local_node = r2nm_get_node_by_num(r2nm_this_node()); - BUG_ON(!local_node); - - r2nm_undepend_item(&local_node->nd_item); - r2nm_node_put(local_node); -} - - -static void __exit exit_r2nm(void) -{ - /* XXX sync with hb callbacks and shut down hb? */ - r2net_unregister_hb_callbacks(); - configfs_unregister_subsystem(&r2nm_cluster_group.cs_subsys); - - r2net_exit(); - r2hb_exit(); -} - -static int __init init_r2nm(void) -{ - int ret = -1; - - ret = r2hb_init(); - if (ret) - goto out; - - ret = r2net_init(); - if (ret) - goto out_r2hb; - - ret = r2net_register_hb_callbacks(); - if (ret) - goto out_r2net; - - config_group_init(&r2nm_cluster_group.cs_subsys.su_group); - mutex_init(&r2nm_cluster_group.cs_subsys.su_mutex); - ret = configfs_register_subsystem(&r2nm_cluster_group.cs_subsys); - if (ret) { - printk(KERN_ERR "nodemanager: Registration returned %d\n", ret); - goto out_callbacks; - } - - if (!ret) - goto out; - - configfs_unregister_subsystem(&r2nm_cluster_group.cs_subsys); -out_callbacks: - r2net_unregister_hb_callbacks(); -out_r2net: - r2net_exit(); -out_r2hb: - r2hb_exit(); -out: - return ret; -} - -MODULE_AUTHOR("Oracle"); -MODULE_LICENSE("GPL"); - -module_init(init_r2nm) -module_exit(exit_r2nm) diff --git a/drivers/staging/ramster/cluster/nodemanager.h b/drivers/staging/ramster/cluster/nodemanager.h deleted file mode 100644 index 41a04df5842c..000000000000 --- a/drivers/staging/ramster/cluster/nodemanager.h +++ /dev/null @@ -1,88 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * nodemanager.h - * - * Function prototypes - * - * Copyright (C) 2004 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - * - */ - -#ifndef R2CLUSTER_NODEMANAGER_H -#define R2CLUSTER_NODEMANAGER_H - -#include "ramster_nodemanager.h" - -/* This totally doesn't belong here. */ -#include <linux/configfs.h> -#include <linux/rbtree.h> - -enum r2nm_fence_method { - R2NM_FENCE_RESET = 0, - R2NM_FENCE_PANIC, - R2NM_FENCE_METHODS, /* Number of fence methods */ -}; - -struct r2nm_node { - spinlock_t nd_lock; - struct config_item nd_item; - char nd_name[R2NM_MAX_NAME_LEN+1]; /* replace? */ - __u8 nd_num; - /* only one address per node, as attributes, for now. */ - __be32 nd_ipv4_address; - __be16 nd_ipv4_port; - struct rb_node nd_ip_node; - /* there can be only one local node for now */ - int nd_local; - - unsigned long nd_set_attributes; -}; - -struct r2nm_cluster { - struct config_group cl_group; - unsigned cl_has_local:1; - u8 cl_local_node; - rwlock_t cl_nodes_lock; - struct r2nm_node *cl_nodes[R2NM_MAX_NODES]; - struct rb_root cl_node_ip_tree; - unsigned int cl_idle_timeout_ms; - unsigned int cl_keepalive_delay_ms; - unsigned int cl_reconnect_delay_ms; - enum r2nm_fence_method cl_fence_method; - - /* part of a hack for disk bitmap.. will go eventually. - zab */ - unsigned long cl_nodes_bitmap[BITS_TO_LONGS(R2NM_MAX_NODES)]; -}; - -extern struct r2nm_cluster *r2nm_single_cluster; - -u8 r2nm_this_node(void); - -int r2nm_configured_node_map(unsigned long *map, unsigned bytes); -struct r2nm_node *r2nm_get_node_by_num(u8 node_num); -struct r2nm_node *r2nm_get_node_by_ip(__be32 addr); -void r2nm_node_get(struct r2nm_node *node); -void r2nm_node_put(struct r2nm_node *node); - -int r2nm_depend_item(struct config_item *item); -void r2nm_undepend_item(struct config_item *item); -int r2nm_depend_this_node(void); -void r2nm_undepend_this_node(void); - -#endif /* R2CLUSTER_NODEMANAGER_H */ diff --git a/drivers/staging/ramster/cluster/ramster_nodemanager.h b/drivers/staging/ramster/cluster/ramster_nodemanager.h deleted file mode 100644 index 49f879d943ab..000000000000 --- a/drivers/staging/ramster/cluster/ramster_nodemanager.h +++ /dev/null @@ -1,39 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * ramster_nodemanager.h - * - * Header describing the interface between userspace and the kernel - * for the ramster_nodemanager module. - * - * Copyright (C) 2002, 2004, 2012 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - * - */ - -#ifndef _RAMSTER_NODEMANAGER_H -#define _RAMSTER_NODEMANAGER_H - -#define R2NM_API_VERSION 5 - -#define R2NM_MAX_NODES 255 -#define R2NM_INVALID_NODE_NUM 255 - -/* host name, group name, cluster name all 64 bytes */ -#define R2NM_MAX_NAME_LEN 64 /* __NEW_UTS_LEN */ - -#endif /* _RAMSTER_NODEMANAGER_H */ diff --git a/drivers/staging/ramster/cluster/tcp.c b/drivers/staging/ramster/cluster/tcp.c deleted file mode 100644 index d0a07d722b61..000000000000 --- a/drivers/staging/ramster/cluster/tcp.c +++ /dev/null @@ -1,2256 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * Copyright (C) 2004 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - * - * ---- - * - * Callers for this were originally written against a very simple synchronus - * API. This implementation reflects those simple callers. Some day I'm sure - * we'll need to move to a more robust posting/callback mechanism. - * - * Transmit calls pass in kernel virtual addresses and block copying this into - * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting - * for a failed socket to timeout. TX callers can also pass in a poniter to an - * 'int' which gets filled with an errno off the wire in response to the - * message they send. - * - * Handlers for unsolicited messages are registered. Each socket has a page - * that incoming data is copied into. First the header, then the data. - * Handlers are called from only one thread with a reference to this per-socket - * page. This page is destroyed after the handler call, so it can't be - * referenced beyond the call. Handlers may block but are discouraged from - * doing so. - * - * Any framing errors (bad magic, large payload lengths) close a connection. - * - * Our sock_container holds the state we associate with a socket. It's current - * framing state is held there as well as the refcounting we do around when it - * is safe to tear down the socket. The socket is only finally torn down from - * the container when the container loses all of its references -- so as long - * as you hold a ref on the container you can trust that the socket is valid - * for use with kernel socket APIs. - * - * Connections are initiated between a pair of nodes when the node with the - * higher node number gets a heartbeat callback which indicates that the lower - * numbered node has started heartbeating. The lower numbered node is passive - * and only accepts the connection if the higher numbered node is heartbeating. - */ - -#include <linux/kernel.h> -#include <linux/jiffies.h> -#include <linux/slab.h> -#include <linux/idr.h> -#include <linux/kref.h> -#include <linux/net.h> -#include <linux/export.h> -#include <linux/uaccess.h> -#include <net/tcp.h> - - -#include "heartbeat.h" -#include "tcp.h" -#include "nodemanager.h" -#define MLOG_MASK_PREFIX ML_TCP -#include "masklog.h" - -#include "tcp_internal.h" - -#define SC_NODEF_FMT "node %s (num %u) at %pI4:%u" - -/* - * In the following two log macros, the whitespace after the ',' just - * before ##args is intentional. Otherwise, gcc 2.95 will eat the - * previous token if args expands to nothing. - */ -#define msglog(hdr, fmt, args...) do { \ - typeof(hdr) __hdr = (hdr); \ - mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \ - "key %08x num %u] " fmt, \ - be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \ - be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \ - be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \ - be32_to_cpu(__hdr->msg_num) , ##args); \ -} while (0) - -#define sclog(sc, fmt, args...) do { \ - typeof(sc) __sc = (sc); \ - mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \ - "pg_off %zu] " fmt, __sc, \ - atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \ - __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \ - ##args); \ -} while (0) - -static DEFINE_RWLOCK(r2net_handler_lock); -static struct rb_root r2net_handler_tree = RB_ROOT; - -static struct r2net_node r2net_nodes[R2NM_MAX_NODES]; - -/* XXX someday we'll need better accounting */ -static struct socket *r2net_listen_sock; - -/* - * listen work is only queued by the listening socket callbacks on the - * r2net_wq. teardown detaches the callbacks before destroying the workqueue. - * quorum work is queued as sock containers are shutdown.. stop_listening - * tears down all the node's sock containers, preventing future shutdowns - * and queued quorum work, before canceling delayed quorum work and - * destroying the work queue. - */ -static struct workqueue_struct *r2net_wq; -static struct work_struct r2net_listen_work; - -static struct r2hb_callback_func r2net_hb_up, r2net_hb_down; -#define R2NET_HB_PRI 0x1 - -static struct r2net_handshake *r2net_hand; -static struct r2net_msg *r2net_keep_req, *r2net_keep_resp; - -static int r2net_sys_err_translations[R2NET_ERR_MAX] = { - [R2NET_ERR_NONE] = 0, - [R2NET_ERR_NO_HNDLR] = -ENOPROTOOPT, - [R2NET_ERR_OVERFLOW] = -EOVERFLOW, - [R2NET_ERR_DIED] = -EHOSTDOWN,}; - -/* can't quite avoid *all* internal declarations :/ */ -static void r2net_sc_connect_completed(struct work_struct *work); -static void r2net_rx_until_empty(struct work_struct *work); -static void r2net_shutdown_sc(struct work_struct *work); -static void r2net_listen_data_ready(struct sock *sk, int bytes); -static void r2net_sc_send_keep_req(struct work_struct *work); -static void r2net_idle_timer(unsigned long data); -static void r2net_sc_postpone_idle(struct r2net_sock_container *sc); -static void r2net_sc_reset_idle_timer(struct r2net_sock_container *sc); - -#ifdef CONFIG_DEBUG_FS -static void r2net_init_nst(struct r2net_send_tracking *nst, u32 msgtype, - u32 msgkey, struct task_struct *task, u8 node) -{ - INIT_LIST_HEAD(&nst->st_net_debug_item); - nst->st_task = task; - nst->st_msg_type = msgtype; - nst->st_msg_key = msgkey; - nst->st_node = node; -} - -static inline void r2net_set_nst_sock_time(struct r2net_send_tracking *nst) -{ - nst->st_sock_time = ktime_get(); -} - -static inline void r2net_set_nst_send_time(struct r2net_send_tracking *nst) -{ - nst->st_send_time = ktime_get(); -} - -static inline void r2net_set_nst_status_time(struct r2net_send_tracking *nst) -{ - nst->st_status_time = ktime_get(); -} - -static inline void r2net_set_nst_sock_container(struct r2net_send_tracking *nst, - struct r2net_sock_container *sc) -{ - nst->st_sc = sc; -} - -static inline void r2net_set_nst_msg_id(struct r2net_send_tracking *nst, - u32 msg_id) -{ - nst->st_id = msg_id; -} - -static inline void r2net_set_sock_timer(struct r2net_sock_container *sc) -{ - sc->sc_tv_timer = ktime_get(); -} - -static inline void r2net_set_data_ready_time(struct r2net_sock_container *sc) -{ - sc->sc_tv_data_ready = ktime_get(); -} - -static inline void r2net_set_advance_start_time(struct r2net_sock_container *sc) -{ - sc->sc_tv_advance_start = ktime_get(); -} - -static inline void r2net_set_advance_stop_time(struct r2net_sock_container *sc) -{ - sc->sc_tv_advance_stop = ktime_get(); -} - -static inline void r2net_set_func_start_time(struct r2net_sock_container *sc) -{ - sc->sc_tv_func_start = ktime_get(); -} - -static inline void r2net_set_func_stop_time(struct r2net_sock_container *sc) -{ - sc->sc_tv_func_stop = ktime_get(); -} - -#else /* CONFIG_DEBUG_FS */ -# define r2net_init_nst(a, b, c, d, e) -# define r2net_set_nst_sock_time(a) -# define r2net_set_nst_send_time(a) -# define r2net_set_nst_status_time(a) -# define r2net_set_nst_sock_container(a, b) -# define r2net_set_nst_msg_id(a, b) -# define r2net_set_sock_timer(a) -# define r2net_set_data_ready_time(a) -# define r2net_set_advance_start_time(a) -# define r2net_set_advance_stop_time(a) -# define r2net_set_func_start_time(a) -# define r2net_set_func_stop_time(a) -#endif /* CONFIG_DEBUG_FS */ - -#ifdef CONFIG_RAMSTER_FS_STATS -static ktime_t r2net_get_func_run_time(struct r2net_sock_container *sc) -{ - return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start); -} - -static void r2net_update_send_stats(struct r2net_send_tracking *nst, - struct r2net_sock_container *sc) -{ - sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total, - ktime_sub(ktime_get(), - nst->st_status_time)); - sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total, - ktime_sub(nst->st_status_time, - nst->st_send_time)); - sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total, - ktime_sub(nst->st_send_time, - nst->st_sock_time)); - sc->sc_send_count++; -} - -static void r2net_update_recv_stats(struct r2net_sock_container *sc) -{ - sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total, - r2net_get_func_run_time(sc)); - sc->sc_recv_count++; -} - -#else - -# define r2net_update_send_stats(a, b) - -# define r2net_update_recv_stats(sc) - -#endif /* CONFIG_RAMSTER_FS_STATS */ - -static inline int r2net_reconnect_delay(void) -{ - return r2nm_single_cluster->cl_reconnect_delay_ms; -} - -static inline int r2net_keepalive_delay(void) -{ - return r2nm_single_cluster->cl_keepalive_delay_ms; -} - -static inline int r2net_idle_timeout(void) -{ - return r2nm_single_cluster->cl_idle_timeout_ms; -} - -static inline int r2net_sys_err_to_errno(enum r2net_system_error err) -{ - int trans; - BUG_ON(err >= R2NET_ERR_MAX); - trans = r2net_sys_err_translations[err]; - - /* Just in case we mess up the translation table above */ - BUG_ON(err != R2NET_ERR_NONE && trans == 0); - return trans; -} - -struct r2net_node *r2net_nn_from_num(u8 node_num) -{ - BUG_ON(node_num >= ARRAY_SIZE(r2net_nodes)); - return &r2net_nodes[node_num]; -} - -static u8 r2net_num_from_nn(struct r2net_node *nn) -{ - BUG_ON(nn == NULL); - return nn - r2net_nodes; -} - -/* ------------------------------------------------------------ */ - -static int r2net_prep_nsw(struct r2net_node *nn, struct r2net_status_wait *nsw) -{ - int ret = 0; - - do { - if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) { - ret = -EAGAIN; - break; - } - spin_lock(&nn->nn_lock); - ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id); - if (ret == 0) - list_add_tail(&nsw->ns_node_item, - &nn->nn_status_list); - spin_unlock(&nn->nn_lock); - } while (ret == -EAGAIN); - - if (ret == 0) { - init_waitqueue_head(&nsw->ns_wq); - nsw->ns_sys_status = R2NET_ERR_NONE; - nsw->ns_status = 0; - } - - return ret; -} - -static void r2net_complete_nsw_locked(struct r2net_node *nn, - struct r2net_status_wait *nsw, - enum r2net_system_error sys_status, - s32 status) -{ - assert_spin_locked(&nn->nn_lock); - - if (!list_empty(&nsw->ns_node_item)) { - list_del_init(&nsw->ns_node_item); - nsw->ns_sys_status = sys_status; - nsw->ns_status = status; - idr_remove(&nn->nn_status_idr, nsw->ns_id); - wake_up(&nsw->ns_wq); - } -} - -static void r2net_complete_nsw(struct r2net_node *nn, - struct r2net_status_wait *nsw, - u64 id, enum r2net_system_error sys_status, - s32 status) -{ - spin_lock(&nn->nn_lock); - if (nsw == NULL) { - if (id > INT_MAX) - goto out; - - nsw = idr_find(&nn->nn_status_idr, id); - if (nsw == NULL) - goto out; - } - - r2net_complete_nsw_locked(nn, nsw, sys_status, status); - -out: - spin_unlock(&nn->nn_lock); - return; -} - -static void r2net_complete_nodes_nsw(struct r2net_node *nn) -{ - struct r2net_status_wait *nsw, *tmp; - unsigned int num_kills = 0; - - assert_spin_locked(&nn->nn_lock); - - list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) { - r2net_complete_nsw_locked(nn, nsw, R2NET_ERR_DIED, 0); - num_kills++; - } - - mlog(0, "completed %d messages for node %u\n", num_kills, - r2net_num_from_nn(nn)); -} - -static int r2net_nsw_completed(struct r2net_node *nn, - struct r2net_status_wait *nsw) -{ - int completed; - spin_lock(&nn->nn_lock); - completed = list_empty(&nsw->ns_node_item); - spin_unlock(&nn->nn_lock); - return completed; -} - -/* ------------------------------------------------------------ */ - -static void sc_kref_release(struct kref *kref) -{ - struct r2net_sock_container *sc = container_of(kref, - struct r2net_sock_container, sc_kref); - BUG_ON(timer_pending(&sc->sc_idle_timeout)); - - sclog(sc, "releasing\n"); - - if (sc->sc_sock) { - sock_release(sc->sc_sock); - sc->sc_sock = NULL; - } - - r2nm_undepend_item(&sc->sc_node->nd_item); - r2nm_node_put(sc->sc_node); - sc->sc_node = NULL; - - r2net_debug_del_sc(sc); - kfree(sc); -} - -static void sc_put(struct r2net_sock_container *sc) -{ - sclog(sc, "put\n"); - kref_put(&sc->sc_kref, sc_kref_release); -} -static void sc_get(struct r2net_sock_container *sc) -{ - sclog(sc, "get\n"); - kref_get(&sc->sc_kref); -} -static struct r2net_sock_container *sc_alloc(struct r2nm_node *node) -{ - struct r2net_sock_container *sc, *ret = NULL; - struct page *page = NULL; - int status = 0; - - page = alloc_page(GFP_NOFS); - sc = kzalloc(sizeof(*sc), GFP_NOFS); - if (sc == NULL || page == NULL) - goto out; - - kref_init(&sc->sc_kref); - r2nm_node_get(node); - sc->sc_node = node; - - /* pin the node item of the remote node */ - status = r2nm_depend_item(&node->nd_item); - if (status) { - mlog_errno(status); - r2nm_node_put(node); - goto out; - } - INIT_WORK(&sc->sc_connect_work, r2net_sc_connect_completed); - INIT_WORK(&sc->sc_rx_work, r2net_rx_until_empty); - INIT_WORK(&sc->sc_shutdown_work, r2net_shutdown_sc); - INIT_DELAYED_WORK(&sc->sc_keepalive_work, r2net_sc_send_keep_req); - - init_timer(&sc->sc_idle_timeout); - sc->sc_idle_timeout.function = r2net_idle_timer; - sc->sc_idle_timeout.data = (unsigned long)sc; - - sclog(sc, "alloced\n"); - - ret = sc; - sc->sc_page = page; - r2net_debug_add_sc(sc); - sc = NULL; - page = NULL; - -out: - if (page) - __free_page(page); - kfree(sc); - - return ret; -} - -/* ------------------------------------------------------------ */ - -static void r2net_sc_queue_work(struct r2net_sock_container *sc, - struct work_struct *work) -{ - sc_get(sc); - if (!queue_work(r2net_wq, work)) - sc_put(sc); -} -static void r2net_sc_queue_delayed_work(struct r2net_sock_container *sc, - struct delayed_work *work, - int delay) -{ - sc_get(sc); - if (!queue_delayed_work(r2net_wq, work, delay)) - sc_put(sc); -} -static void r2net_sc_cancel_delayed_work(struct r2net_sock_container *sc, - struct delayed_work *work) -{ - if (cancel_delayed_work(work)) - sc_put(sc); -} - -static atomic_t r2net_connected_peers = ATOMIC_INIT(0); - -int r2net_num_connected_peers(void) -{ - return atomic_read(&r2net_connected_peers); -} - -static void r2net_set_nn_state(struct r2net_node *nn, - struct r2net_sock_container *sc, - unsigned valid, int err) -{ - int was_valid = nn->nn_sc_valid; - int was_err = nn->nn_persistent_error; - struct r2net_sock_container *old_sc = nn->nn_sc; - - assert_spin_locked(&nn->nn_lock); - - if (old_sc && !sc) - atomic_dec(&r2net_connected_peers); - else if (!old_sc && sc) - atomic_inc(&r2net_connected_peers); - - /* the node num comparison and single connect/accept path should stop - * an non-null sc from being overwritten with another */ - BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); - mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); - mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); - - if (was_valid && !valid && err == 0) - err = -ENOTCONN; - - mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", - r2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, - nn->nn_persistent_error, err); - - nn->nn_sc = sc; - nn->nn_sc_valid = valid ? 1 : 0; - nn->nn_persistent_error = err; - - /* mirrors r2net_tx_can_proceed() */ - if (nn->nn_persistent_error || nn->nn_sc_valid) - wake_up(&nn->nn_sc_wq); - - if (!was_err && nn->nn_persistent_error) { - queue_delayed_work(r2net_wq, &nn->nn_still_up, - msecs_to_jiffies(R2NET_QUORUM_DELAY_MS)); - } - - if (was_valid && !valid) { - printk(KERN_NOTICE "ramster: No longer connected to " - SC_NODEF_FMT "\n", - old_sc->sc_node->nd_name, old_sc->sc_node->nd_num, - &old_sc->sc_node->nd_ipv4_address, - ntohs(old_sc->sc_node->nd_ipv4_port)); - r2net_complete_nodes_nsw(nn); - } - - if (!was_valid && valid) { - cancel_delayed_work(&nn->nn_connect_expired); - printk(KERN_NOTICE "ramster: %s " SC_NODEF_FMT "\n", - r2nm_this_node() > sc->sc_node->nd_num ? - "Connected to" : "Accepted connection from", - sc->sc_node->nd_name, sc->sc_node->nd_num, - &sc->sc_node->nd_ipv4_address, - ntohs(sc->sc_node->nd_ipv4_port)); - } - - /* trigger the connecting worker func as long as we're not valid, - * it will back off if it shouldn't connect. This can be called - * from node config teardown and so needs to be careful about - * the work queue actually being up. */ - if (!valid && r2net_wq) { - unsigned long delay; - /* delay if we're within a RECONNECT_DELAY of the - * last attempt */ - delay = (nn->nn_last_connect_attempt + - msecs_to_jiffies(r2net_reconnect_delay())) - - jiffies; - if (delay > msecs_to_jiffies(r2net_reconnect_delay())) - delay = 0; - mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); - queue_delayed_work(r2net_wq, &nn->nn_connect_work, delay); - - /* - * Delay the expired work after idle timeout. - * - * We might have lots of failed connection attempts that run - * through here but we only cancel the connect_expired work when - * a connection attempt succeeds. So only the first enqueue of - * the connect_expired work will do anything. The rest will see - * that it's already queued and do nothing. - */ - delay += msecs_to_jiffies(r2net_idle_timeout()); - queue_delayed_work(r2net_wq, &nn->nn_connect_expired, delay); - } - - /* keep track of the nn's sc ref for the caller */ - if ((old_sc == NULL) && sc) - sc_get(sc); - if (old_sc && (old_sc != sc)) { - r2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); - sc_put(old_sc); - } -} - -/* see r2net_register_callbacks() */ -static void r2net_data_ready(struct sock *sk, int bytes) -{ - void (*ready)(struct sock *sk, int bytes); - - read_lock(&sk->sk_callback_lock); - if (sk->sk_user_data) { - struct r2net_sock_container *sc = sk->sk_user_data; - sclog(sc, "data_ready hit\n"); - r2net_set_data_ready_time(sc); - r2net_sc_queue_work(sc, &sc->sc_rx_work); - ready = sc->sc_data_ready; - } else { - ready = sk->sk_data_ready; - } - read_unlock(&sk->sk_callback_lock); - - ready(sk, bytes); -} - -/* see r2net_register_callbacks() */ -static void r2net_state_change(struct sock *sk) -{ - void (*state_change)(struct sock *sk); - struct r2net_sock_container *sc; - - read_lock(&sk->sk_callback_lock); - sc = sk->sk_user_data; - if (sc == NULL) { - state_change = sk->sk_state_change; - goto out; - } - - sclog(sc, "state_change to %d\n", sk->sk_state); - - state_change = sc->sc_state_change; - - switch (sk->sk_state) { - - /* ignore connecting sockets as they make progress */ - case TCP_SYN_SENT: - case TCP_SYN_RECV: - break; - case TCP_ESTABLISHED: - r2net_sc_queue_work(sc, &sc->sc_connect_work); - break; - default: - printk(KERN_INFO "ramster: Connection to " - SC_NODEF_FMT " shutdown, state %d\n", - sc->sc_node->nd_name, sc->sc_node->nd_num, - &sc->sc_node->nd_ipv4_address, - ntohs(sc->sc_node->nd_ipv4_port), sk->sk_state); - r2net_sc_queue_work(sc, &sc->sc_shutdown_work); - break; - - } -out: - read_unlock(&sk->sk_callback_lock); - state_change(sk); -} - -/* - * we register callbacks so we can queue work on events before calling - * the original callbacks. our callbacks are careful to test user_data - * to discover when they've reaced with r2net_unregister_callbacks(). - */ -static void r2net_register_callbacks(struct sock *sk, - struct r2net_sock_container *sc) -{ - write_lock_bh(&sk->sk_callback_lock); - - /* accepted sockets inherit the old listen socket data ready */ - if (sk->sk_data_ready == r2net_listen_data_ready) { - sk->sk_data_ready = sk->sk_user_data; - sk->sk_user_data = NULL; - } - - BUG_ON(sk->sk_user_data != NULL); - sk->sk_user_data = sc; - sc_get(sc); - - sc->sc_data_ready = sk->sk_data_ready; - sc->sc_state_change = sk->sk_state_change; - sk->sk_data_ready = r2net_data_ready; - sk->sk_state_change = r2net_state_change; - - mutex_init(&sc->sc_send_lock); - - write_unlock_bh(&sk->sk_callback_lock); -} - -static int r2net_unregister_callbacks(struct sock *sk, - struct r2net_sock_container *sc) -{ - int ret = 0; - - write_lock_bh(&sk->sk_callback_lock); - if (sk->sk_user_data == sc) { - ret = 1; - sk->sk_user_data = NULL; - sk->sk_data_ready = sc->sc_data_ready; - sk->sk_state_change = sc->sc_state_change; - } - write_unlock_bh(&sk->sk_callback_lock); - - return ret; -} - -/* - * this is a little helper that is called by callers who have seen a problem - * with an sc and want to detach it from the nn if someone already hasn't beat - * them to it. if an error is given then the shutdown will be persistent - * and pending transmits will be canceled. - */ -static void r2net_ensure_shutdown(struct r2net_node *nn, - struct r2net_sock_container *sc, - int err) -{ - spin_lock(&nn->nn_lock); - if (nn->nn_sc == sc) - r2net_set_nn_state(nn, NULL, 0, err); - spin_unlock(&nn->nn_lock); -} - -/* - * This work queue function performs the blocking parts of socket shutdown. A - * few paths lead here. set_nn_state will trigger this callback if it sees an - * sc detached from the nn. state_change will also trigger this callback - * directly when it sees errors. In that case we need to call set_nn_state - * ourselves as state_change couldn't get the nn_lock and call set_nn_state - * itself. - */ -static void r2net_shutdown_sc(struct work_struct *work) -{ - struct r2net_sock_container *sc = - container_of(work, struct r2net_sock_container, - sc_shutdown_work); - struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); - - sclog(sc, "shutting down\n"); - - /* drop the callbacks ref and call shutdown only once */ - if (r2net_unregister_callbacks(sc->sc_sock->sk, sc)) { - /* we shouldn't flush as we're in the thread, the - * races with pending sc work structs are harmless */ - del_timer_sync(&sc->sc_idle_timeout); - r2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); - sc_put(sc); - kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR); - } - - /* not fatal so failed connects before the other guy has our - * heartbeat can be retried */ - r2net_ensure_shutdown(nn, sc, 0); - sc_put(sc); -} - -/* ------------------------------------------------------------ */ - -static int r2net_handler_cmp(struct r2net_msg_handler *nmh, u32 msg_type, - u32 key) -{ - int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); - - if (ret == 0) - ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); - - return ret; -} - -static struct r2net_msg_handler * -r2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, - struct rb_node **ret_parent) -{ - struct rb_node **p = &r2net_handler_tree.rb_node; - struct rb_node *parent = NULL; - struct r2net_msg_handler *nmh, *ret = NULL; - int cmp; - - while (*p) { - parent = *p; - nmh = rb_entry(parent, struct r2net_msg_handler, nh_node); - cmp = r2net_handler_cmp(nmh, msg_type, key); - - if (cmp < 0) - p = &(*p)->rb_left; - else if (cmp > 0) - p = &(*p)->rb_right; - else { - ret = nmh; - break; - } - } - - if (ret_p != NULL) - *ret_p = p; - if (ret_parent != NULL) - *ret_parent = parent; - - return ret; -} - -static void r2net_handler_kref_release(struct kref *kref) -{ - struct r2net_msg_handler *nmh; - nmh = container_of(kref, struct r2net_msg_handler, nh_kref); - - kfree(nmh); -} - -static void r2net_handler_put(struct r2net_msg_handler *nmh) -{ - kref_put(&nmh->nh_kref, r2net_handler_kref_release); -} - -/* max_len is protection for the handler func. incoming messages won't - * be given to the handler if their payload is longer than the max. */ -int r2net_register_handler(u32 msg_type, u32 key, u32 max_len, - r2net_msg_handler_func *func, void *data, - r2net_post_msg_handler_func *post_func, - struct list_head *unreg_list) -{ - struct r2net_msg_handler *nmh = NULL; - struct rb_node **p, *parent; - int ret = 0; - - if (max_len > R2NET_MAX_PAYLOAD_BYTES) { - mlog(0, "max_len for message handler out of range: %u\n", - max_len); - ret = -EINVAL; - goto out; - } - - if (!msg_type) { - mlog(0, "no message type provided: %u, %p\n", msg_type, func); - ret = -EINVAL; - goto out; - - } - if (!func) { - mlog(0, "no message handler provided: %u, %p\n", - msg_type, func); - ret = -EINVAL; - goto out; - } - - nmh = kzalloc(sizeof(struct r2net_msg_handler), GFP_NOFS); - if (nmh == NULL) { - ret = -ENOMEM; - goto out; - } - - nmh->nh_func = func; - nmh->nh_func_data = data; - nmh->nh_post_func = post_func; - nmh->nh_msg_type = msg_type; - nmh->nh_max_len = max_len; - nmh->nh_key = key; - /* the tree and list get this ref.. they're both removed in - * unregister when this ref is dropped */ - kref_init(&nmh->nh_kref); - INIT_LIST_HEAD(&nmh->nh_unregister_item); - - write_lock(&r2net_handler_lock); - if (r2net_handler_tree_lookup(msg_type, key, &p, &parent)) - ret = -EEXIST; - else { - rb_link_node(&nmh->nh_node, parent, p); - rb_insert_color(&nmh->nh_node, &r2net_handler_tree); - list_add_tail(&nmh->nh_unregister_item, unreg_list); - - mlog(ML_TCP, "registered handler func %p type %u key %08x\n", - func, msg_type, key); - /* we've had some trouble with handlers seemingly vanishing. */ - mlog_bug_on_msg(r2net_handler_tree_lookup(msg_type, key, &p, - &parent) == NULL, - "couldn't find handler we *just* registered " - "for type %u key %08x\n", msg_type, key); - } - write_unlock(&r2net_handler_lock); - if (ret) - goto out; - -out: - if (ret) - kfree(nmh); - - return ret; -} -EXPORT_SYMBOL_GPL(r2net_register_handler); - -void r2net_unregister_handler_list(struct list_head *list) -{ - struct r2net_msg_handler *nmh, *n; - - write_lock(&r2net_handler_lock); - list_for_each_entry_safe(nmh, n, list, nh_unregister_item) { - mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", - nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); - rb_erase(&nmh->nh_node, &r2net_handler_tree); - list_del_init(&nmh->nh_unregister_item); - kref_put(&nmh->nh_kref, r2net_handler_kref_release); - } - write_unlock(&r2net_handler_lock); -} -EXPORT_SYMBOL_GPL(r2net_unregister_handler_list); - -static struct r2net_msg_handler *r2net_handler_get(u32 msg_type, u32 key) -{ - struct r2net_msg_handler *nmh; - - read_lock(&r2net_handler_lock); - nmh = r2net_handler_tree_lookup(msg_type, key, NULL, NULL); - if (nmh) - kref_get(&nmh->nh_kref); - read_unlock(&r2net_handler_lock); - - return nmh; -} - -/* ------------------------------------------------------------ */ - -static int r2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) -{ - int ret; - mm_segment_t oldfs; - struct kvec vec = { - .iov_len = len, - .iov_base = data, - }; - struct msghdr msg = { - .msg_iovlen = 1, - .msg_iov = (struct iovec *)&vec, - .msg_flags = MSG_DONTWAIT, - }; - - oldfs = get_fs(); - set_fs(get_ds()); - ret = sock_recvmsg(sock, &msg, len, msg.msg_flags); - set_fs(oldfs); - - return ret; -} - -static int r2net_send_tcp_msg(struct socket *sock, struct kvec *vec, - size_t veclen, size_t total) -{ - int ret; - mm_segment_t oldfs; - struct msghdr msg = { - .msg_iov = (struct iovec *)vec, - .msg_iovlen = veclen, - }; - - if (sock == NULL) { - ret = -EINVAL; - goto out; - } - - oldfs = get_fs(); - set_fs(get_ds()); - ret = sock_sendmsg(sock, &msg, total); - set_fs(oldfs); - if (ret != total) { - mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, - total); - if (ret >= 0) - ret = -EPIPE; /* should be smarter, I bet */ - goto out; - } - - ret = 0; -out: - if (ret < 0) - mlog(0, "returning error: %d\n", ret); - return ret; -} - -static void r2net_sendpage(struct r2net_sock_container *sc, - void *kmalloced_virt, - size_t size) -{ - struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); - ssize_t ret; - - while (1) { - mutex_lock(&sc->sc_send_lock); - ret = sc->sc_sock->ops->sendpage(sc->sc_sock, - virt_to_page(kmalloced_virt), - (long)kmalloced_virt & ~PAGE_MASK, - size, MSG_DONTWAIT); - mutex_unlock(&sc->sc_send_lock); - if (ret == size) - break; - if (ret == (ssize_t)-EAGAIN) { - mlog(0, "sendpage of size %zu to " SC_NODEF_FMT - " returned EAGAIN\n", size, sc->sc_node->nd_name, - sc->sc_node->nd_num, - &sc->sc_node->nd_ipv4_address, - ntohs(sc->sc_node->nd_ipv4_port)); - cond_resched(); - continue; - } - mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT - " failed with %zd\n", size, sc->sc_node->nd_name, - sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, - ntohs(sc->sc_node->nd_ipv4_port), ret); - r2net_ensure_shutdown(nn, sc, 0); - break; - } -} - -static void r2net_init_msg(struct r2net_msg *msg, u16 data_len, - u16 msg_type, u32 key) -{ - memset(msg, 0, sizeof(struct r2net_msg)); - msg->magic = cpu_to_be16(R2NET_MSG_MAGIC); - msg->data_len = cpu_to_be16(data_len); - msg->msg_type = cpu_to_be16(msg_type); - msg->sys_status = cpu_to_be32(R2NET_ERR_NONE); - msg->status = 0; - msg->key = cpu_to_be32(key); -} - -static int r2net_tx_can_proceed(struct r2net_node *nn, - struct r2net_sock_container **sc_ret, - int *error) -{ - int ret = 0; - - spin_lock(&nn->nn_lock); - if (nn->nn_persistent_error) { - ret = 1; - *sc_ret = NULL; - *error = nn->nn_persistent_error; - } else if (nn->nn_sc_valid) { - kref_get(&nn->nn_sc->sc_kref); - - ret = 1; - *sc_ret = nn->nn_sc; - *error = 0; - } - spin_unlock(&nn->nn_lock); - - return ret; -} - -/* Get a map of all nodes to which this node is currently connected to */ -void r2net_fill_node_map(unsigned long *map, unsigned bytes) -{ - struct r2net_sock_container *sc; - int node, ret; - - BUG_ON(bytes < (BITS_TO_LONGS(R2NM_MAX_NODES) * sizeof(unsigned long))); - - memset(map, 0, bytes); - for (node = 0; node < R2NM_MAX_NODES; ++node) { - r2net_tx_can_proceed(r2net_nn_from_num(node), &sc, &ret); - if (!ret) { - set_bit(node, map); - sc_put(sc); - } - } -} -EXPORT_SYMBOL_GPL(r2net_fill_node_map); - -int r2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, - size_t caller_veclen, u8 target_node, int *status) -{ - int ret = 0; - struct r2net_msg *msg = NULL; - size_t veclen, caller_bytes = 0; - struct kvec *vec = NULL; - struct r2net_sock_container *sc = NULL; - struct r2net_node *nn = r2net_nn_from_num(target_node); - struct r2net_status_wait nsw = { - .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), - }; - struct r2net_send_tracking nst; - - /* this may be a general bug fix */ - init_waitqueue_head(&nsw.ns_wq); - - r2net_init_nst(&nst, msg_type, key, current, target_node); - - if (r2net_wq == NULL) { - mlog(0, "attempt to tx without r2netd running\n"); - ret = -ESRCH; - goto out; - } - - if (caller_veclen == 0) { - mlog(0, "bad kvec array length\n"); - ret = -EINVAL; - goto out; - } - - caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); - if (caller_bytes > R2NET_MAX_PAYLOAD_BYTES) { - mlog(0, "total payload len %zu too large\n", caller_bytes); - ret = -EINVAL; - goto out; - } - - if (target_node == r2nm_this_node()) { - ret = -ELOOP; - goto out; - } - - r2net_debug_add_nst(&nst); - - r2net_set_nst_sock_time(&nst); - - wait_event(nn->nn_sc_wq, r2net_tx_can_proceed(nn, &sc, &ret)); - if (ret) - goto out; - - r2net_set_nst_sock_container(&nst, sc); - - veclen = caller_veclen + 1; - vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); - if (vec == NULL) { - mlog(0, "failed to %zu element kvec!\n", veclen); - ret = -ENOMEM; - goto out; - } - - msg = kmalloc(sizeof(struct r2net_msg), GFP_ATOMIC); - if (!msg) { - mlog(0, "failed to allocate a r2net_msg!\n"); - ret = -ENOMEM; - goto out; - } - - r2net_init_msg(msg, caller_bytes, msg_type, key); - - vec[0].iov_len = sizeof(struct r2net_msg); - vec[0].iov_base = msg; - memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); - - ret = r2net_prep_nsw(nn, &nsw); - if (ret) - goto out; - - msg->msg_num = cpu_to_be32(nsw.ns_id); - r2net_set_nst_msg_id(&nst, nsw.ns_id); - - r2net_set_nst_send_time(&nst); - - /* finally, convert the message header to network byte-order - * and send */ - mutex_lock(&sc->sc_send_lock); - ret = r2net_send_tcp_msg(sc->sc_sock, vec, veclen, - sizeof(struct r2net_msg) + caller_bytes); - mutex_unlock(&sc->sc_send_lock); - msglog(msg, "sending returned %d\n", ret); - if (ret < 0) { - mlog(0, "error returned from r2net_send_tcp_msg=%d\n", ret); - goto out; - } - - /* wait on other node's handler */ - r2net_set_nst_status_time(&nst); - wait_event(nsw.ns_wq, r2net_nsw_completed(nn, &nsw)); - - r2net_update_send_stats(&nst, sc); - - /* Note that we avoid overwriting the callers status return - * variable if a system error was reported on the other - * side. Callers beware. */ - ret = r2net_sys_err_to_errno(nsw.ns_sys_status); - if (status && !ret) - *status = nsw.ns_status; - - mlog(0, "woken, returning system status %d, user status %d\n", - ret, nsw.ns_status); -out: - r2net_debug_del_nst(&nst); /* must be before dropping sc and node */ - if (sc) - sc_put(sc); - kfree(vec); - kfree(msg); - r2net_complete_nsw(nn, &nsw, 0, 0, 0); - return ret; -} -EXPORT_SYMBOL_GPL(r2net_send_message_vec); - -int r2net_send_message(u32 msg_type, u32 key, void *data, u32 len, - u8 target_node, int *status) -{ - struct kvec vec = { - .iov_base = data, - .iov_len = len, - }; - return r2net_send_message_vec(msg_type, key, &vec, 1, - target_node, status); -} -EXPORT_SYMBOL_GPL(r2net_send_message); - -static int r2net_send_status_magic(struct socket *sock, struct r2net_msg *hdr, - enum r2net_system_error syserr, int err) -{ - struct kvec vec = { - .iov_base = hdr, - .iov_len = sizeof(struct r2net_msg), - }; - - BUG_ON(syserr >= R2NET_ERR_MAX); - - /* leave other fields intact from the incoming message, msg_num - * in particular */ - hdr->sys_status = cpu_to_be32(syserr); - hdr->status = cpu_to_be32(err); - /* twiddle the magic */ - hdr->magic = cpu_to_be16(R2NET_MSG_STATUS_MAGIC); - hdr->data_len = 0; - - msglog(hdr, "about to send status magic %d\n", err); - /* hdr has been in host byteorder this whole time */ - return r2net_send_tcp_msg(sock, &vec, 1, sizeof(struct r2net_msg)); -} - -/* - * "data magic" is a long version of "status magic" where the message - * payload actually contains data to be passed in reply to certain messages - */ -static int r2net_send_data_magic(struct r2net_sock_container *sc, - struct r2net_msg *hdr, - void *data, size_t data_len, - enum r2net_system_error syserr, int err) -{ - struct kvec vec[2]; - int ret; - - vec[0].iov_base = hdr; - vec[0].iov_len = sizeof(struct r2net_msg); - vec[1].iov_base = data; - vec[1].iov_len = data_len; - - BUG_ON(syserr >= R2NET_ERR_MAX); - - /* leave other fields intact from the incoming message, msg_num - * in particular */ - hdr->sys_status = cpu_to_be32(syserr); - hdr->status = cpu_to_be32(err); - hdr->magic = cpu_to_be16(R2NET_MSG_DATA_MAGIC); /* twiddle magic */ - hdr->data_len = cpu_to_be16(data_len); - - msglog(hdr, "about to send data magic %d\n", err); - /* hdr has been in host byteorder this whole time */ - ret = r2net_send_tcp_msg(sc->sc_sock, vec, 2, - sizeof(struct r2net_msg) + data_len); - return ret; -} - -/* - * called by a message handler to convert an otherwise normal reply - * message into a "data magic" message - */ -void r2net_force_data_magic(struct r2net_msg *hdr, u16 msgtype, u32 msgkey) -{ - hdr->magic = cpu_to_be16(R2NET_MSG_DATA_MAGIC); - hdr->msg_type = cpu_to_be16(msgtype); - hdr->key = cpu_to_be32(msgkey); -} - -/* this returns -errno if the header was unknown or too large, etc. - * after this is called the buffer us reused for the next message */ -static int r2net_process_message(struct r2net_sock_container *sc, - struct r2net_msg *hdr) -{ - struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); - int ret = 0, handler_status; - enum r2net_system_error syserr; - struct r2net_msg_handler *nmh = NULL; - void *ret_data = NULL; - int data_magic = 0; - - msglog(hdr, "processing message\n"); - - r2net_sc_postpone_idle(sc); - - switch (be16_to_cpu(hdr->magic)) { - - case R2NET_MSG_STATUS_MAGIC: - /* special type for returning message status */ - r2net_complete_nsw(nn, NULL, be32_to_cpu(hdr->msg_num), - be32_to_cpu(hdr->sys_status), - be32_to_cpu(hdr->status)); - goto out; - case R2NET_MSG_KEEP_REQ_MAGIC: - r2net_sendpage(sc, r2net_keep_resp, sizeof(*r2net_keep_resp)); - goto out; - case R2NET_MSG_KEEP_RESP_MAGIC: - goto out; - case R2NET_MSG_MAGIC: - break; - case R2NET_MSG_DATA_MAGIC: - /* - * unlike a normal status magic, a data magic DOES - * (MUST) have a handler, so the control flow is - * a little funky here as a result - */ - data_magic = 1; - break; - default: - msglog(hdr, "bad magic\n"); - ret = -EINVAL; - goto out; - break; - } - - /* find a handler for it */ - handler_status = 0; - nmh = r2net_handler_get(be16_to_cpu(hdr->msg_type), - be32_to_cpu(hdr->key)); - if (!nmh) { - mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", - be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); - syserr = R2NET_ERR_NO_HNDLR; - goto out_respond; - } - - syserr = R2NET_ERR_NONE; - - if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) - syserr = R2NET_ERR_OVERFLOW; - - if (syserr != R2NET_ERR_NONE) - goto out_respond; - - r2net_set_func_start_time(sc); - sc->sc_msg_key = be32_to_cpu(hdr->key); - sc->sc_msg_type = be16_to_cpu(hdr->msg_type); - handler_status = (nmh->nh_func)(hdr, sizeof(struct r2net_msg) + - be16_to_cpu(hdr->data_len), - nmh->nh_func_data, &ret_data); - if (data_magic) { - /* - * handler handled data sent in reply to request - * so complete the transaction - */ - r2net_complete_nsw(nn, NULL, be32_to_cpu(hdr->msg_num), - be32_to_cpu(hdr->sys_status), handler_status); - goto out; - } - /* - * handler changed magic to DATA_MAGIC to reply to request for data, - * implies ret_data points to data to return and handler_status - * is the number of bytes of data - */ - if (be16_to_cpu(hdr->magic) == R2NET_MSG_DATA_MAGIC) { - ret = r2net_send_data_magic(sc, hdr, - ret_data, handler_status, - syserr, 0); - hdr = NULL; - mlog(0, "sending data reply %d, syserr %d returned %d\n", - handler_status, syserr, ret); - r2net_set_func_stop_time(sc); - - r2net_update_recv_stats(sc); - goto out; - } - r2net_set_func_stop_time(sc); - - r2net_update_recv_stats(sc); - -out_respond: - /* this destroys the hdr, so don't use it after this */ - mutex_lock(&sc->sc_send_lock); - ret = r2net_send_status_magic(sc->sc_sock, hdr, syserr, - handler_status); - mutex_unlock(&sc->sc_send_lock); - hdr = NULL; - mlog(0, "sending handler status %d, syserr %d returned %d\n", - handler_status, syserr, ret); - - if (nmh) { - BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL); - if (nmh->nh_post_func) - (nmh->nh_post_func)(handler_status, nmh->nh_func_data, - ret_data); - } - -out: - if (nmh) - r2net_handler_put(nmh); - return ret; -} - -static int r2net_check_handshake(struct r2net_sock_container *sc) -{ - struct r2net_handshake *hand = page_address(sc->sc_page); - struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); - - if (hand->protocol_version != cpu_to_be64(R2NET_PROTOCOL_VERSION)) { - printk(KERN_NOTICE "ramster: " SC_NODEF_FMT " Advertised net " - "protocol version %llu but %llu is required. " - "Disconnecting.\n", sc->sc_node->nd_name, - sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, - ntohs(sc->sc_node->nd_ipv4_port), - (unsigned long long)be64_to_cpu(hand->protocol_version), - R2NET_PROTOCOL_VERSION); - - /* don't bother reconnecting if its the wrong version. */ - r2net_ensure_shutdown(nn, sc, -ENOTCONN); - return -1; - } - - /* - * Ensure timeouts are consistent with other nodes, otherwise - * we can end up with one node thinking that the other must be down, - * but isn't. This can ultimately cause corruption. - */ - if (be32_to_cpu(hand->r2net_idle_timeout_ms) != - r2net_idle_timeout()) { - printk(KERN_NOTICE "ramster: " SC_NODEF_FMT " uses a network " - "idle timeout of %u ms, but we use %u ms locally. " - "Disconnecting.\n", sc->sc_node->nd_name, - sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, - ntohs(sc->sc_node->nd_ipv4_port), - be32_to_cpu(hand->r2net_idle_timeout_ms), - r2net_idle_timeout()); - r2net_ensure_shutdown(nn, sc, -ENOTCONN); - return -1; - } - - if (be32_to_cpu(hand->r2net_keepalive_delay_ms) != - r2net_keepalive_delay()) { - printk(KERN_NOTICE "ramster: " SC_NODEF_FMT " uses a keepalive " - "delay of %u ms, but we use %u ms locally. " - "Disconnecting.\n", sc->sc_node->nd_name, - sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, - ntohs(sc->sc_node->nd_ipv4_port), - be32_to_cpu(hand->r2net_keepalive_delay_ms), - r2net_keepalive_delay()); - r2net_ensure_shutdown(nn, sc, -ENOTCONN); - return -1; - } - - if (be32_to_cpu(hand->r2hb_heartbeat_timeout_ms) != - R2HB_MAX_WRITE_TIMEOUT_MS) { - printk(KERN_NOTICE "ramster: " SC_NODEF_FMT " uses a heartbeat " - "timeout of %u ms, but we use %u ms locally. " - "Disconnecting.\n", sc->sc_node->nd_name, - sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, - ntohs(sc->sc_node->nd_ipv4_port), - be32_to_cpu(hand->r2hb_heartbeat_timeout_ms), - R2HB_MAX_WRITE_TIMEOUT_MS); - r2net_ensure_shutdown(nn, sc, -ENOTCONN); - return -1; - } - - sc->sc_handshake_ok = 1; - - spin_lock(&nn->nn_lock); - /* set valid and queue the idle timers only if it hasn't been - * shut down already */ - if (nn->nn_sc == sc) { - r2net_sc_reset_idle_timer(sc); - atomic_set(&nn->nn_timeout, 0); - r2net_set_nn_state(nn, sc, 1, 0); - } - spin_unlock(&nn->nn_lock); - - /* shift everything up as though it wasn't there */ - sc->sc_page_off -= sizeof(struct r2net_handshake); - if (sc->sc_page_off) - memmove(hand, hand + 1, sc->sc_page_off); - - return 0; -} - -/* this demuxes the queued rx bytes into header or payload bits and calls - * handlers as each full message is read off the socket. it returns -error, - * == 0 eof, or > 0 for progress made.*/ -static int r2net_advance_rx(struct r2net_sock_container *sc) -{ - struct r2net_msg *hdr; - int ret = 0; - void *data; - size_t datalen; - - sclog(sc, "receiving\n"); - r2net_set_advance_start_time(sc); - - if (unlikely(sc->sc_handshake_ok == 0)) { - if (sc->sc_page_off < sizeof(struct r2net_handshake)) { - data = page_address(sc->sc_page) + sc->sc_page_off; - datalen = sizeof(struct r2net_handshake) - - sc->sc_page_off; - ret = r2net_recv_tcp_msg(sc->sc_sock, data, datalen); - if (ret > 0) - sc->sc_page_off += ret; - } - - if (sc->sc_page_off == sizeof(struct r2net_handshake)) { - r2net_check_handshake(sc); - if (unlikely(sc->sc_handshake_ok == 0)) - ret = -EPROTO; - } - goto out; - } - - /* do we need more header? */ - if (sc->sc_page_off < sizeof(struct r2net_msg)) { - data = page_address(sc->sc_page) + sc->sc_page_off; - datalen = sizeof(struct r2net_msg) - sc->sc_page_off; - ret = r2net_recv_tcp_msg(sc->sc_sock, data, datalen); - if (ret > 0) { - sc->sc_page_off += ret; - /* only swab incoming here.. we can - * only get here once as we cross from - * being under to over */ - if (sc->sc_page_off == sizeof(struct r2net_msg)) { - hdr = page_address(sc->sc_page); - if (be16_to_cpu(hdr->data_len) > - R2NET_MAX_PAYLOAD_BYTES) - ret = -EOVERFLOW; - } - } - if (ret <= 0) - goto out; - } - - if (sc->sc_page_off < sizeof(struct r2net_msg)) { - /* oof, still don't have a header */ - goto out; - } - - /* this was swabbed above when we first read it */ - hdr = page_address(sc->sc_page); - - msglog(hdr, "at page_off %zu\n", sc->sc_page_off); - - /* do we need more payload? */ - if (sc->sc_page_off - sizeof(struct r2net_msg) < - be16_to_cpu(hdr->data_len)) { - /* need more payload */ - data = page_address(sc->sc_page) + sc->sc_page_off; - datalen = (sizeof(struct r2net_msg) + - be16_to_cpu(hdr->data_len)) - - sc->sc_page_off; - ret = r2net_recv_tcp_msg(sc->sc_sock, data, datalen); - if (ret > 0) - sc->sc_page_off += ret; - if (ret <= 0) - goto out; - } - - if (sc->sc_page_off - sizeof(struct r2net_msg) == - be16_to_cpu(hdr->data_len)) { - /* we can only get here once, the first time we read - * the payload.. so set ret to progress if the handler - * works out. after calling this the message is toast */ - ret = r2net_process_message(sc, hdr); - if (ret == 0) - ret = 1; - sc->sc_page_off = 0; - } - -out: - sclog(sc, "ret = %d\n", ret); - r2net_set_advance_stop_time(sc); - return ret; -} - -/* this work func is triggerd by data ready. it reads until it can read no - * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing - * our work the work struct will be marked and we'll be called again. */ -static void r2net_rx_until_empty(struct work_struct *work) -{ - struct r2net_sock_container *sc = - container_of(work, struct r2net_sock_container, sc_rx_work); - int ret; - - do { - ret = r2net_advance_rx(sc); - } while (ret > 0); - - if (ret <= 0 && ret != -EAGAIN) { - struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); - sclog(sc, "saw error %d, closing\n", ret); - /* not permanent so read failed handshake can retry */ - r2net_ensure_shutdown(nn, sc, 0); - } - - sc_put(sc); -} - -static int r2net_set_nodelay(struct socket *sock) -{ - int ret, val = 1; - mm_segment_t oldfs; - - oldfs = get_fs(); - set_fs(KERNEL_DS); - - /* - * Dear unsuspecting programmer, - * - * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level - * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will - * silently turn into SO_DEBUG. - * - * Yours, - * Keeper of hilariously fragile interfaces. - */ - ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, - (char __user *)&val, sizeof(val)); - - set_fs(oldfs); - return ret; -} - -static void r2net_initialize_handshake(void) -{ - r2net_hand->r2hb_heartbeat_timeout_ms = cpu_to_be32( - R2HB_MAX_WRITE_TIMEOUT_MS); - r2net_hand->r2net_idle_timeout_ms = cpu_to_be32(r2net_idle_timeout()); - r2net_hand->r2net_keepalive_delay_ms = cpu_to_be32( - r2net_keepalive_delay()); - r2net_hand->r2net_reconnect_delay_ms = cpu_to_be32( - r2net_reconnect_delay()); -} - -/* ------------------------------------------------------------ */ - -/* called when a connect completes and after a sock is accepted. the - * rx path will see the response and mark the sc valid */ -static void r2net_sc_connect_completed(struct work_struct *work) -{ - struct r2net_sock_container *sc = - container_of(work, struct r2net_sock_container, - sc_connect_work); - - mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", - (unsigned long long)R2NET_PROTOCOL_VERSION, - (unsigned long long)be64_to_cpu(r2net_hand->connector_id)); - - r2net_initialize_handshake(); - r2net_sendpage(sc, r2net_hand, sizeof(*r2net_hand)); - sc_put(sc); -} - -/* this is called as a work_struct func. */ -static void r2net_sc_send_keep_req(struct work_struct *work) -{ - struct r2net_sock_container *sc = - container_of(work, struct r2net_sock_container, - sc_keepalive_work.work); - - r2net_sendpage(sc, r2net_keep_req, sizeof(*r2net_keep_req)); - sc_put(sc); -} - -/* socket shutdown does a del_timer_sync against this as it tears down. - * we can't start this timer until we've got to the point in sc buildup - * where shutdown is going to be involved */ -static void r2net_idle_timer(unsigned long data) -{ - struct r2net_sock_container *sc = (struct r2net_sock_container *)data; -#ifdef CONFIG_DEBUG_FS - unsigned long msecs = ktime_to_ms(ktime_get()) - - ktime_to_ms(sc->sc_tv_timer); -#else - unsigned long msecs = r2net_idle_timeout(); -#endif - - printk(KERN_NOTICE "ramster: Connection to " SC_NODEF_FMT " has been " - "idle for %lu.%lu secs, shutting it down.\n", - sc->sc_node->nd_name, sc->sc_node->nd_num, - &sc->sc_node->nd_ipv4_address, ntohs(sc->sc_node->nd_ipv4_port), - msecs / 1000, msecs % 1000); - - /* - * Initialize the nn_timeout so that the next connection attempt - * will continue in r2net_start_connect. - */ - /* Avoid spurious shutdowns... not sure if this is still necessary */ - pr_err("ramster_idle_timer, skipping shutdown work\n"); -#if 0 - /* old code used to do these two lines */ - atomic_set(&nn->nn_timeout, 1); - r2net_sc_queue_work(sc, &sc->sc_shutdown_work); -#endif -} - -static void r2net_sc_reset_idle_timer(struct r2net_sock_container *sc) -{ - r2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); - r2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, - msecs_to_jiffies(r2net_keepalive_delay())); - r2net_set_sock_timer(sc); - mod_timer(&sc->sc_idle_timeout, - jiffies + msecs_to_jiffies(r2net_idle_timeout())); -} - -static void r2net_sc_postpone_idle(struct r2net_sock_container *sc) -{ - /* Only push out an existing timer */ - if (timer_pending(&sc->sc_idle_timeout)) - r2net_sc_reset_idle_timer(sc); -} - -/* this work func is kicked whenever a path sets the nn state which doesn't - * have valid set. This includes seeing hb come up, losing a connection, - * having a connect attempt fail, etc. This centralizes the logic which decides - * if a connect attempt should be made or if we should give up and all future - * transmit attempts should fail */ -static void r2net_start_connect(struct work_struct *work) -{ - struct r2net_node *nn = - container_of(work, struct r2net_node, nn_connect_work.work); - struct r2net_sock_container *sc = NULL; - struct r2nm_node *node = NULL, *mynode = NULL; - struct socket *sock = NULL; - struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; - int ret = 0, stop; - unsigned int timeout; - - /* if we're greater we initiate tx, otherwise we accept */ - if (r2nm_this_node() <= r2net_num_from_nn(nn)) - goto out; - - /* watch for racing with tearing a node down */ - node = r2nm_get_node_by_num(r2net_num_from_nn(nn)); - if (node == NULL) { - ret = 0; - goto out; - } - - mynode = r2nm_get_node_by_num(r2nm_this_node()); - if (mynode == NULL) { - ret = 0; - goto out; - } - - spin_lock(&nn->nn_lock); - /* - * see if we already have one pending or have given up. - * For nn_timeout, it is set when we close the connection - * because of the idle time out. So it means that we have - * at least connected to that node successfully once, - * now try to connect to it again. - */ - timeout = atomic_read(&nn->nn_timeout); - stop = (nn->nn_sc || - (nn->nn_persistent_error && - (nn->nn_persistent_error != -ENOTCONN || timeout == 0))); - spin_unlock(&nn->nn_lock); - if (stop) - goto out; - - nn->nn_last_connect_attempt = jiffies; - - sc = sc_alloc(node); - if (sc == NULL) { - mlog(0, "couldn't allocate sc\n"); - ret = -ENOMEM; - goto out; - } - - ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); - if (ret < 0) { - mlog(0, "can't create socket: %d\n", ret); - goto out; - } - sc->sc_sock = sock; /* freed by sc_kref_release */ - - sock->sk->sk_allocation = GFP_ATOMIC; - - myaddr.sin_family = AF_INET; - myaddr.sin_addr.s_addr = mynode->nd_ipv4_address; - myaddr.sin_port = htons(0); /* any port */ - - ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, - sizeof(myaddr)); - if (ret) { - mlog(ML_ERROR, "bind failed with %d at address %pI4\n", - ret, &mynode->nd_ipv4_address); - goto out; - } - - ret = r2net_set_nodelay(sc->sc_sock); - if (ret) { - mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); - goto out; - } - - r2net_register_callbacks(sc->sc_sock->sk, sc); - - spin_lock(&nn->nn_lock); - /* handshake completion will set nn->nn_sc_valid */ - r2net_set_nn_state(nn, sc, 0, 0); - spin_unlock(&nn->nn_lock); - - remoteaddr.sin_family = AF_INET; - remoteaddr.sin_addr.s_addr = node->nd_ipv4_address; - remoteaddr.sin_port = node->nd_ipv4_port; - - ret = sc->sc_sock->ops->connect(sc->sc_sock, - (struct sockaddr *)&remoteaddr, - sizeof(remoteaddr), - O_NONBLOCK); - if (ret == -EINPROGRESS) - ret = 0; - -out: - if (ret) { - printk(KERN_NOTICE "ramster: Connect attempt to " SC_NODEF_FMT - " failed with errno %d\n", sc->sc_node->nd_name, - sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, - ntohs(sc->sc_node->nd_ipv4_port), ret); - /* 0 err so that another will be queued and attempted - * from set_nn_state */ - if (sc) - r2net_ensure_shutdown(nn, sc, 0); - } - if (sc) - sc_put(sc); - if (node) - r2nm_node_put(node); - if (mynode) - r2nm_node_put(mynode); - - return; -} - -static void r2net_connect_expired(struct work_struct *work) -{ - struct r2net_node *nn = - container_of(work, struct r2net_node, nn_connect_expired.work); - - spin_lock(&nn->nn_lock); - if (!nn->nn_sc_valid) { - printk(KERN_NOTICE "ramster: No connection established with " - "node %u after %u.%u seconds, giving up.\n", - r2net_num_from_nn(nn), - r2net_idle_timeout() / 1000, - r2net_idle_timeout() % 1000); - - r2net_set_nn_state(nn, NULL, 0, -ENOTCONN); - } - spin_unlock(&nn->nn_lock); -} - -static void r2net_still_up(struct work_struct *work) -{ -} - -/* ------------------------------------------------------------ */ - -void r2net_disconnect_node(struct r2nm_node *node) -{ - struct r2net_node *nn = r2net_nn_from_num(node->nd_num); - - /* don't reconnect until it's heartbeating again */ - spin_lock(&nn->nn_lock); - atomic_set(&nn->nn_timeout, 0); - r2net_set_nn_state(nn, NULL, 0, -ENOTCONN); - spin_unlock(&nn->nn_lock); - - if (r2net_wq) { - cancel_delayed_work(&nn->nn_connect_expired); - cancel_delayed_work(&nn->nn_connect_work); - cancel_delayed_work(&nn->nn_still_up); - flush_workqueue(r2net_wq); - } -} - -static void r2net_hb_node_down_cb(struct r2nm_node *node, int node_num, - void *data) -{ - if (!node) - return; - - if (node_num != r2nm_this_node()) - r2net_disconnect_node(node); - - BUG_ON(atomic_read(&r2net_connected_peers) < 0); -} - -static void r2net_hb_node_up_cb(struct r2nm_node *node, int node_num, - void *data) -{ - struct r2net_node *nn = r2net_nn_from_num(node_num); - - BUG_ON(!node); - - /* ensure an immediate connect attempt */ - nn->nn_last_connect_attempt = jiffies - - (msecs_to_jiffies(r2net_reconnect_delay()) + 1); - - if (node_num != r2nm_this_node()) { - /* believe it or not, accept and node hearbeating testing - * can succeed for this node before we got here.. so - * only use set_nn_state to clear the persistent error - * if that hasn't already happened */ - spin_lock(&nn->nn_lock); - atomic_set(&nn->nn_timeout, 0); - if (nn->nn_persistent_error) - r2net_set_nn_state(nn, NULL, 0, 0); - spin_unlock(&nn->nn_lock); - } -} - -void r2net_unregister_hb_callbacks(void) -{ - r2hb_unregister_callback(NULL, &r2net_hb_up); - r2hb_unregister_callback(NULL, &r2net_hb_down); -} - -int r2net_register_hb_callbacks(void) -{ - int ret; - - r2hb_setup_callback(&r2net_hb_down, R2HB_NODE_DOWN_CB, - r2net_hb_node_down_cb, NULL, R2NET_HB_PRI); - r2hb_setup_callback(&r2net_hb_up, R2HB_NODE_UP_CB, - r2net_hb_node_up_cb, NULL, R2NET_HB_PRI); - - ret = r2hb_register_callback(NULL, &r2net_hb_up); - if (ret == 0) - ret = r2hb_register_callback(NULL, &r2net_hb_down); - - if (ret) - r2net_unregister_hb_callbacks(); - - return ret; -} - -/* ------------------------------------------------------------ */ - -static int r2net_accept_one(struct socket *sock) -{ - int ret, slen; - struct sockaddr_in sin; - struct socket *new_sock = NULL; - struct r2nm_node *node = NULL; - struct r2nm_node *local_node = NULL; - struct r2net_sock_container *sc = NULL; - struct r2net_node *nn; - - BUG_ON(sock == NULL); - ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, - sock->sk->sk_protocol, &new_sock); - if (ret) - goto out; - - new_sock->type = sock->type; - new_sock->ops = sock->ops; - ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); - if (ret < 0) - goto out; - - new_sock->sk->sk_allocation = GFP_ATOMIC; - - ret = r2net_set_nodelay(new_sock); - if (ret) { - mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); - goto out; - } - - slen = sizeof(sin); - ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, - &slen, 1); - if (ret < 0) - goto out; - - node = r2nm_get_node_by_ip(sin.sin_addr.s_addr); - if (node == NULL) { - printk(KERN_NOTICE "ramster: Attempt to connect from unknown " - "node at %pI4:%d\n", &sin.sin_addr.s_addr, - ntohs(sin.sin_port)); - ret = -EINVAL; - goto out; - } - - if (r2nm_this_node() >= node->nd_num) { - local_node = r2nm_get_node_by_num(r2nm_this_node()); - printk(KERN_NOTICE "ramster: Unexpected connect attempt seen " - "at node '%s' (%u, %pI4:%d) from node '%s' (%u, " - "%pI4:%d)\n", local_node->nd_name, local_node->nd_num, - &(local_node->nd_ipv4_address), - ntohs(local_node->nd_ipv4_port), node->nd_name, - node->nd_num, &sin.sin_addr.s_addr, ntohs(sin.sin_port)); - ret = -EINVAL; - goto out; - } - - /* this happens all the time when the other node sees our heartbeat - * and tries to connect before we see their heartbeat */ - if (!r2hb_check_node_heartbeating_from_callback(node->nd_num)) { - mlog(ML_CONN, "attempt to connect from node '%s' at " - "%pI4:%d but it isn't heartbeating\n", - node->nd_name, &sin.sin_addr.s_addr, - ntohs(sin.sin_port)); - ret = -EINVAL; - goto out; - } - - nn = r2net_nn_from_num(node->nd_num); - - spin_lock(&nn->nn_lock); - if (nn->nn_sc) - ret = -EBUSY; - else - ret = 0; - spin_unlock(&nn->nn_lock); - if (ret) { - printk(KERN_NOTICE "ramster: Attempt to connect from node '%s' " - "at %pI4:%d but it already has an open connection\n", - node->nd_name, &sin.sin_addr.s_addr, - ntohs(sin.sin_port)); - goto out; - } - - sc = sc_alloc(node); - if (sc == NULL) { - ret = -ENOMEM; - goto out; - } - - sc->sc_sock = new_sock; - new_sock = NULL; - - spin_lock(&nn->nn_lock); - atomic_set(&nn->nn_timeout, 0); - r2net_set_nn_state(nn, sc, 0, 0); - spin_unlock(&nn->nn_lock); - - r2net_register_callbacks(sc->sc_sock->sk, sc); - r2net_sc_queue_work(sc, &sc->sc_rx_work); - - r2net_initialize_handshake(); - r2net_sendpage(sc, r2net_hand, sizeof(*r2net_hand)); - -out: - if (new_sock) - sock_release(new_sock); - if (node) - r2nm_node_put(node); - if (local_node) - r2nm_node_put(local_node); - if (sc) - sc_put(sc); - return ret; -} - -static void r2net_accept_many(struct work_struct *work) -{ - struct socket *sock = r2net_listen_sock; - while (r2net_accept_one(sock) == 0) - cond_resched(); -} - -static void r2net_listen_data_ready(struct sock *sk, int bytes) -{ - void (*ready)(struct sock *sk, int bytes); - - read_lock(&sk->sk_callback_lock); - ready = sk->sk_user_data; - if (ready == NULL) { /* check for teardown race */ - ready = sk->sk_data_ready; - goto out; - } - - /* ->sk_data_ready is also called for a newly established child socket - * before it has been accepted and the acceptor has set up their - * data_ready.. we only want to queue listen work for our listening - * socket */ - if (sk->sk_state == TCP_LISTEN) { - mlog(ML_TCP, "bytes: %d\n", bytes); - queue_work(r2net_wq, &r2net_listen_work); - } - -out: - read_unlock(&sk->sk_callback_lock); - ready(sk, bytes); -} - -static int r2net_open_listening_sock(__be32 addr, __be16 port) -{ - struct socket *sock = NULL; - int ret; - struct sockaddr_in sin = { - .sin_family = PF_INET, - .sin_addr = { .s_addr = addr }, - .sin_port = port, - }; - - ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); - if (ret < 0) { - printk(KERN_ERR "ramster: Error %d while creating socket\n", - ret); - goto out; - } - - sock->sk->sk_allocation = GFP_ATOMIC; - - write_lock_bh(&sock->sk->sk_callback_lock); - sock->sk->sk_user_data = sock->sk->sk_data_ready; - sock->sk->sk_data_ready = r2net_listen_data_ready; - write_unlock_bh(&sock->sk->sk_callback_lock); - - r2net_listen_sock = sock; - INIT_WORK(&r2net_listen_work, r2net_accept_many); - - sock->sk->sk_reuse = SK_CAN_REUSE; - ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); - if (ret < 0) { - printk(KERN_ERR "ramster: Error %d while binding socket at " - "%pI4:%u\n", ret, &addr, ntohs(port)); - goto out; - } - - ret = sock->ops->listen(sock, 64); - if (ret < 0) - printk(KERN_ERR "ramster: Error %d while listening on %pI4:%u\n", - ret, &addr, ntohs(port)); - -out: - if (ret) { - r2net_listen_sock = NULL; - if (sock) - sock_release(sock); - } - return ret; -} - -/* - * called from node manager when we should bring up our network listening - * socket. node manager handles all the serialization to only call this - * once and to match it with r2net_stop_listening(). note, - * r2nm_this_node() doesn't work yet as we're being called while it - * is being set up. - */ -int r2net_start_listening(struct r2nm_node *node) -{ - int ret = 0; - - BUG_ON(r2net_wq != NULL); - BUG_ON(r2net_listen_sock != NULL); - - mlog(ML_KTHREAD, "starting r2net thread...\n"); - r2net_wq = create_singlethread_workqueue("r2net"); - if (r2net_wq == NULL) { - mlog(ML_ERROR, "unable to launch r2net thread\n"); - return -ENOMEM; /* ? */ - } - - ret = r2net_open_listening_sock(node->nd_ipv4_address, - node->nd_ipv4_port); - if (ret) { - destroy_workqueue(r2net_wq); - r2net_wq = NULL; - } - - return ret; -} - -/* again, r2nm_this_node() doesn't work here as we're involved in - * tearing it down */ -void r2net_stop_listening(struct r2nm_node *node) -{ - struct socket *sock = r2net_listen_sock; - size_t i; - - BUG_ON(r2net_wq == NULL); - BUG_ON(r2net_listen_sock == NULL); - - /* stop the listening socket from generating work */ - write_lock_bh(&sock->sk->sk_callback_lock); - sock->sk->sk_data_ready = sock->sk->sk_user_data; - sock->sk->sk_user_data = NULL; - write_unlock_bh(&sock->sk->sk_callback_lock); - - for (i = 0; i < ARRAY_SIZE(r2net_nodes); i++) { - struct r2nm_node *node = r2nm_get_node_by_num(i); - if (node) { - r2net_disconnect_node(node); - r2nm_node_put(node); - } - } - - /* finish all work and tear down the work queue */ - mlog(ML_KTHREAD, "waiting for r2net thread to exit....\n"); - destroy_workqueue(r2net_wq); - r2net_wq = NULL; - - sock_release(r2net_listen_sock); - r2net_listen_sock = NULL; -} - -void r2net_hb_node_up_manual(int node_num) -{ - struct r2nm_node dummy; - if (r2nm_single_cluster == NULL) - pr_err("ramster: cluster not alive, node_up_manual ignored\n"); - else { - r2hb_manual_set_node_heartbeating(node_num); - r2net_hb_node_up_cb(&dummy, node_num, NULL); - } -} - -/* ------------------------------------------------------------ */ - -int r2net_init(void) -{ - unsigned long i; - - if (r2net_debugfs_init()) - return -ENOMEM; - - r2net_hand = kzalloc(sizeof(struct r2net_handshake), GFP_KERNEL); - r2net_keep_req = kzalloc(sizeof(struct r2net_msg), GFP_KERNEL); - r2net_keep_resp = kzalloc(sizeof(struct r2net_msg), GFP_KERNEL); - if (!r2net_hand || !r2net_keep_req || !r2net_keep_resp) { - kfree(r2net_hand); - kfree(r2net_keep_req); - kfree(r2net_keep_resp); - return -ENOMEM; - } - - r2net_hand->protocol_version = cpu_to_be64(R2NET_PROTOCOL_VERSION); - r2net_hand->connector_id = cpu_to_be64(1); - - r2net_keep_req->magic = cpu_to_be16(R2NET_MSG_KEEP_REQ_MAGIC); - r2net_keep_resp->magic = cpu_to_be16(R2NET_MSG_KEEP_RESP_MAGIC); - - for (i = 0; i < ARRAY_SIZE(r2net_nodes); i++) { - struct r2net_node *nn = r2net_nn_from_num(i); - - atomic_set(&nn->nn_timeout, 0); - spin_lock_init(&nn->nn_lock); - INIT_DELAYED_WORK(&nn->nn_connect_work, r2net_start_connect); - INIT_DELAYED_WORK(&nn->nn_connect_expired, - r2net_connect_expired); - INIT_DELAYED_WORK(&nn->nn_still_up, r2net_still_up); - /* until we see hb from a node we'll return einval */ - nn->nn_persistent_error = -ENOTCONN; - init_waitqueue_head(&nn->nn_sc_wq); - idr_init(&nn->nn_status_idr); - INIT_LIST_HEAD(&nn->nn_status_list); - } - - return 0; -} - -void r2net_exit(void) -{ - kfree(r2net_hand); - kfree(r2net_keep_req); - kfree(r2net_keep_resp); - r2net_debugfs_exit(); -} diff --git a/drivers/staging/ramster/cluster/tcp.h b/drivers/staging/ramster/cluster/tcp.h deleted file mode 100644 index 9d05833452b5..000000000000 --- a/drivers/staging/ramster/cluster/tcp.h +++ /dev/null @@ -1,159 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * tcp.h - * - * Function prototypes - * - * Copyright (C) 2004 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - * - */ - -#ifndef R2CLUSTER_TCP_H -#define R2CLUSTER_TCP_H - -#include <linux/socket.h> -#ifdef __KERNEL__ -#include <net/sock.h> -#include <linux/tcp.h> -#else -#include <sys/socket.h> -#endif -#include <linux/inet.h> -#include <linux/in.h> - -struct r2net_msg { - __be16 magic; - __be16 data_len; - __be16 msg_type; - __be16 pad1; - __be32 sys_status; - __be32 status; - __be32 key; - __be32 msg_num; - __u8 buf[0]; -}; - -typedef int (r2net_msg_handler_func)(struct r2net_msg *msg, u32 len, void *data, - void **ret_data); -typedef void (r2net_post_msg_handler_func)(int status, void *data, - void *ret_data); - -#define R2NET_MAX_PAYLOAD_BYTES (4096 - sizeof(struct r2net_msg)) - -/* same as hb delay, we're waiting for another node to recognize our hb */ -#define R2NET_RECONNECT_DELAY_MS_DEFAULT 2000 - -#define R2NET_KEEPALIVE_DELAY_MS_DEFAULT 2000 -#define R2NET_IDLE_TIMEOUT_MS_DEFAULT 30000 - - -/* TODO: figure this out.... */ -static inline int r2net_link_down(int err, struct socket *sock) -{ - if (sock) { - if (sock->sk->sk_state != TCP_ESTABLISHED && - sock->sk->sk_state != TCP_CLOSE_WAIT) - return 1; - } - - if (err >= 0) - return 0; - switch (err) { - - /* ????????????????????????? */ - case -ERESTARTSYS: - case -EBADF: - /* When the server has died, an ICMP port unreachable - * message prompts ECONNREFUSED. */ - case -ECONNREFUSED: - case -ENOTCONN: - case -ECONNRESET: - case -EPIPE: - return 1; - - } - return 0; -} - -enum { - R2NET_DRIVER_UNINITED, - R2NET_DRIVER_READY, -}; - -int r2net_send_message(u32 msg_type, u32 key, void *data, u32 len, - u8 target_node, int *status); -int r2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec, - size_t veclen, u8 target_node, int *status); - -int r2net_register_handler(u32 msg_type, u32 key, u32 max_len, - r2net_msg_handler_func *func, void *data, - r2net_post_msg_handler_func *post_func, - struct list_head *unreg_list); -void r2net_unregister_handler_list(struct list_head *list); - -void r2net_fill_node_map(unsigned long *map, unsigned bytes); - -void r2net_force_data_magic(struct r2net_msg *, u16, u32); -void r2net_hb_node_up_manual(int); -struct r2net_node *r2net_nn_from_num(u8); - -struct r2nm_node; -int r2net_register_hb_callbacks(void); -void r2net_unregister_hb_callbacks(void); -int r2net_start_listening(struct r2nm_node *node); -void r2net_stop_listening(struct r2nm_node *node); -void r2net_disconnect_node(struct r2nm_node *node); -int r2net_num_connected_peers(void); - -int r2net_init(void); -void r2net_exit(void); - -struct r2net_send_tracking; -struct r2net_sock_container; - -#if 0 -int r2net_debugfs_init(void); -void r2net_debugfs_exit(void); -void r2net_debug_add_nst(struct r2net_send_tracking *nst); -void r2net_debug_del_nst(struct r2net_send_tracking *nst); -void r2net_debug_add_sc(struct r2net_sock_container *sc); -void r2net_debug_del_sc(struct r2net_sock_container *sc); -#else -static inline int r2net_debugfs_init(void) -{ - return 0; -} -static inline void r2net_debugfs_exit(void) -{ -} -static inline void r2net_debug_add_nst(struct r2net_send_tracking *nst) -{ -} -static inline void r2net_debug_del_nst(struct r2net_send_tracking *nst) -{ -} -static inline void r2net_debug_add_sc(struct r2net_sock_container *sc) -{ -} -static inline void r2net_debug_del_sc(struct r2net_sock_container *sc) -{ -} -#endif /* CONFIG_DEBUG_FS */ - -#endif /* R2CLUSTER_TCP_H */ diff --git a/drivers/staging/ramster/cluster/tcp_internal.h b/drivers/staging/ramster/cluster/tcp_internal.h deleted file mode 100644 index 4d8cc9f96fd2..000000000000 --- a/drivers/staging/ramster/cluster/tcp_internal.h +++ /dev/null @@ -1,248 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * Copyright (C) 2005 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ - -#ifndef R2CLUSTER_TCP_INTERNAL_H -#define R2CLUSTER_TCP_INTERNAL_H - -#define R2NET_MSG_MAGIC ((u16)0xfa55) -#define R2NET_MSG_STATUS_MAGIC ((u16)0xfa56) -#define R2NET_MSG_KEEP_REQ_MAGIC ((u16)0xfa57) -#define R2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58) -/* - * "data magic" is a long version of "status magic" where the message - * payload actually contains data to be passed in reply to certain messages - */ -#define R2NET_MSG_DATA_MAGIC ((u16)0xfa59) - -/* we're delaying our quorum decision so that heartbeat will have timed - * out truly dead nodes by the time we come around to making decisions - * on their number */ -#define R2NET_QUORUM_DELAY_MS \ - ((r2hb_dead_threshold + 2) * R2HB_REGION_TIMEOUT_MS) - -/* - * This version number represents quite a lot, unfortunately. It not - * only represents the raw network message protocol on the wire but also - * locking semantics of the file system using the protocol. It should - * be somewhere else, I'm sure, but right now it isn't. - * - * With version 11, we separate out the filesystem locking portion. The - * filesystem now has a major.minor version it negotiates. Version 11 - * introduces this negotiation to the r2dlm protocol, and as such the - * version here in tcp_internal.h should not need to be bumped for - * filesystem locking changes. - * - * New in version 11 - * - Negotiation of filesystem locking in the dlm join. - * - * New in version 10: - * - Meta/data locks combined - * - * New in version 9: - * - All votes removed - * - * New in version 8: - * - Replace delete inode votes with a cluster lock - * - * New in version 7: - * - DLM join domain includes the live nodemap - * - * New in version 6: - * - DLM lockres remote refcount fixes. - * - * New in version 5: - * - Network timeout checking protocol - * - * New in version 4: - * - Remove i_generation from lock names for better stat performance. - * - * New in version 3: - * - Replace dentry votes with a cluster lock - * - * New in version 2: - * - full 64 bit i_size in the metadata lock lvbs - * - introduction of "rw" lock and pushing meta/data locking down - */ -#define R2NET_PROTOCOL_VERSION 11ULL -struct r2net_handshake { - __be64 protocol_version; - __be64 connector_id; - __be32 r2hb_heartbeat_timeout_ms; - __be32 r2net_idle_timeout_ms; - __be32 r2net_keepalive_delay_ms; - __be32 r2net_reconnect_delay_ms; -}; - -struct r2net_node { - /* this is never called from int/bh */ - spinlock_t nn_lock; - - /* set the moment an sc is allocated and a connect is started */ - struct r2net_sock_container *nn_sc; - /* _valid is only set after the handshake passes and tx can happen */ - unsigned nn_sc_valid:1; - /* if this is set tx just returns it */ - int nn_persistent_error; - /* It is only set to 1 after the idle time out. */ - atomic_t nn_timeout; - - /* threads waiting for an sc to arrive wait on the wq for generation - * to increase. it is increased when a connecting socket succeeds - * or fails or when an accepted socket is attached. */ - wait_queue_head_t nn_sc_wq; - - struct idr nn_status_idr; - struct list_head nn_status_list; - - /* connects are attempted from when heartbeat comes up until either hb - * goes down, the node is unconfigured, no connect attempts succeed - * before R2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work - * is queued from set_nn_state both from hb up and from itself if a - * connect attempt fails and so can be self-arming. shutdown is - * careful to first mark the nn such that no connects will be attempted - * before canceling delayed connect work and flushing the queue. */ - struct delayed_work nn_connect_work; - unsigned long nn_last_connect_attempt; - - /* this is queued as nodes come up and is canceled when a connection is - * established. this expiring gives up on the node and errors out - * transmits */ - struct delayed_work nn_connect_expired; - - /* after we give up on a socket we wait a while before deciding - * that it is still heartbeating and that we should do some - * quorum work */ - struct delayed_work nn_still_up; -}; - -struct r2net_sock_container { - struct kref sc_kref; - /* the next two are valid for the life time of the sc */ - struct socket *sc_sock; - struct r2nm_node *sc_node; - - /* all of these sc work structs hold refs on the sc while they are - * queued. they should not be able to ref a freed sc. the teardown - * race is with r2net_wq destruction in r2net_stop_listening() */ - - /* rx and connect work are generated from socket callbacks. sc - * shutdown removes the callbacks and then flushes the work queue */ - struct work_struct sc_rx_work; - struct work_struct sc_connect_work; - /* shutdown work is triggered in two ways. the simple way is - * for a code path calls ensure_shutdown which gets a lock, removes - * the sc from the nn, and queues the work. in this case the - * work is single-shot. the work is also queued from a sock - * callback, though, and in this case the work will find the sc - * still on the nn and will call ensure_shutdown itself.. this - * ends up triggering the shutdown work again, though nothing - * will be done in that second iteration. so work queue teardown - * has to be careful to remove the sc from the nn before waiting - * on the work queue so that the shutdown work doesn't remove the - * sc and rearm itself. - */ - struct work_struct sc_shutdown_work; - - struct timer_list sc_idle_timeout; - struct delayed_work sc_keepalive_work; - - unsigned sc_handshake_ok:1; - - struct page *sc_page; - size_t sc_page_off; - - /* original handlers for the sockets */ - void (*sc_state_change)(struct sock *sk); - void (*sc_data_ready)(struct sock *sk, int bytes); - - u32 sc_msg_key; - u16 sc_msg_type; - -#ifdef CONFIG_DEBUG_FS - struct list_head sc_net_debug_item; - ktime_t sc_tv_timer; - ktime_t sc_tv_data_ready; - ktime_t sc_tv_advance_start; - ktime_t sc_tv_advance_stop; - ktime_t sc_tv_func_start; - ktime_t sc_tv_func_stop; -#endif -#ifdef CONFIG_RAMSTER_FS_STATS - ktime_t sc_tv_acquiry_total; - ktime_t sc_tv_send_total; - ktime_t sc_tv_status_total; - u32 sc_send_count; - u32 sc_recv_count; - ktime_t sc_tv_process_total; -#endif - struct mutex sc_send_lock; -}; - -struct r2net_msg_handler { - struct rb_node nh_node; - u32 nh_max_len; - u32 nh_msg_type; - u32 nh_key; - r2net_msg_handler_func *nh_func; - r2net_msg_handler_func *nh_func_data; - r2net_post_msg_handler_func - *nh_post_func; - struct kref nh_kref; - struct list_head nh_unregister_item; -}; - -enum r2net_system_error { - R2NET_ERR_NONE = 0, - R2NET_ERR_NO_HNDLR, - R2NET_ERR_OVERFLOW, - R2NET_ERR_DIED, - R2NET_ERR_MAX -}; - -struct r2net_status_wait { - enum r2net_system_error ns_sys_status; - s32 ns_status; - int ns_id; - wait_queue_head_t ns_wq; - struct list_head ns_node_item; -}; - -#ifdef CONFIG_DEBUG_FS -/* just for state dumps */ -struct r2net_send_tracking { - struct list_head st_net_debug_item; - struct task_struct *st_task; - struct r2net_sock_container *st_sc; - u32 st_id; - u32 st_msg_type; - u32 st_msg_key; - u8 st_node; - ktime_t st_sock_time; - ktime_t st_send_time; - ktime_t st_status_time; -}; -#else -struct r2net_send_tracking { - u32 dummy; -}; -#endif /* CONFIG_DEBUG_FS */ - -#endif /* R2CLUSTER_TCP_INTERNAL_H */ diff --git a/drivers/staging/ramster/r2net.c b/drivers/staging/ramster/r2net.c deleted file mode 100644 index fc830c3ac74b..000000000000 --- a/drivers/staging/ramster/r2net.c +++ /dev/null @@ -1,401 +0,0 @@ -/* - * r2net.c - * - * Copyright (c) 2011, Dan Magenheimer, Oracle Corp. - * - * Ramster_r2net provides an interface between zcache and r2net. - * - * FIXME: support more than two nodes - */ - -#include <linux/list.h> -#include "cluster/tcp.h" -#include "cluster/nodemanager.h" -#include "tmem.h" -#include "zcache.h" -#include "ramster.h" - -#define RAMSTER_TESTING - -#define RMSTR_KEY 0x77347734 - -enum { - RMSTR_TMEM_PUT_EPH = 100, - RMSTR_TMEM_PUT_PERS, - RMSTR_TMEM_ASYNC_GET_REQUEST, - RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST, - RMSTR_TMEM_ASYNC_GET_REPLY, - RMSTR_TMEM_FLUSH, - RMSTR_TMEM_FLOBJ, - RMSTR_TMEM_DESTROY_POOL, -}; - -#define RMSTR_R2NET_MAX_LEN \ - (R2NET_MAX_PAYLOAD_BYTES - sizeof(struct tmem_xhandle)) - -#include "cluster/tcp_internal.h" - -static struct r2nm_node *r2net_target_node; -static int r2net_target_nodenum; - -int r2net_remote_target_node_set(int node_num) -{ - int ret = -1; - - r2net_target_node = r2nm_get_node_by_num(node_num); - if (r2net_target_node != NULL) { - r2net_target_nodenum = node_num; - r2nm_node_put(r2net_target_node); - ret = 0; - } - return ret; -} - -/* FIXME following buffer should be per-cpu, protected by preempt_disable */ -static char ramster_async_get_buf[R2NET_MAX_PAYLOAD_BYTES]; - -static int ramster_remote_async_get_request_handler(struct r2net_msg *msg, - u32 len, void *data, void **ret_data) -{ - char *pdata; - struct tmem_xhandle xh; - int found; - size_t size = RMSTR_R2NET_MAX_LEN; - u16 msgtype = be16_to_cpu(msg->msg_type); - bool get_and_free = (msgtype == RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST); - unsigned long flags; - - xh = *(struct tmem_xhandle *)msg->buf; - if (xh.xh_data_size > RMSTR_R2NET_MAX_LEN) - BUG(); - pdata = ramster_async_get_buf; - *(struct tmem_xhandle *)pdata = xh; - pdata += sizeof(struct tmem_xhandle); - local_irq_save(flags); - found = zcache_get(xh.client_id, xh.pool_id, &xh.oid, xh.index, - pdata, &size, 1, get_and_free ? 1 : -1); - local_irq_restore(flags); - if (found < 0) { - /* a zero size indicates the get failed */ - size = 0; - } - if (size > RMSTR_R2NET_MAX_LEN) - BUG(); - *ret_data = pdata - sizeof(struct tmem_xhandle); - /* now make caller (r2net_process_message) handle specially */ - r2net_force_data_magic(msg, RMSTR_TMEM_ASYNC_GET_REPLY, RMSTR_KEY); - return size + sizeof(struct tmem_xhandle); -} - -static int ramster_remote_async_get_reply_handler(struct r2net_msg *msg, - u32 len, void *data, void **ret_data) -{ - char *in = (char *)msg->buf; - int datalen = len - sizeof(struct r2net_msg); - int ret = -1; - struct tmem_xhandle *xh = (struct tmem_xhandle *)in; - - in += sizeof(struct tmem_xhandle); - datalen -= sizeof(struct tmem_xhandle); - BUG_ON(datalen < 0 || datalen > PAGE_SIZE); - ret = zcache_localify(xh->pool_id, &xh->oid, xh->index, - in, datalen, xh->extra); -#ifdef RAMSTER_TESTING - if (ret == -EEXIST) - pr_err("TESTING ArrgREP, aborted overwrite on racy put\n"); -#endif - return ret; -} - -int ramster_remote_put_handler(struct r2net_msg *msg, - u32 len, void *data, void **ret_data) -{ - struct tmem_xhandle *xh; - char *p = (char *)msg->buf; - int datalen = len - sizeof(struct r2net_msg) - - sizeof(struct tmem_xhandle); - u16 msgtype = be16_to_cpu(msg->msg_type); - bool ephemeral = (msgtype == RMSTR_TMEM_PUT_EPH); - unsigned long flags; - int ret; - - xh = (struct tmem_xhandle *)p; - p += sizeof(struct tmem_xhandle); - zcache_autocreate_pool(xh->client_id, xh->pool_id, ephemeral); - local_irq_save(flags); - ret = zcache_put(xh->client_id, xh->pool_id, &xh->oid, xh->index, - p, datalen, 1, ephemeral ? 1 : -1); - local_irq_restore(flags); - return ret; -} - -int ramster_remote_flush_handler(struct r2net_msg *msg, - u32 len, void *data, void **ret_data) -{ - struct tmem_xhandle *xh; - char *p = (char *)msg->buf; - - xh = (struct tmem_xhandle *)p; - p += sizeof(struct tmem_xhandle); - (void)zcache_flush(xh->client_id, xh->pool_id, &xh->oid, xh->index); - return 0; -} - -int ramster_remote_flobj_handler(struct r2net_msg *msg, - u32 len, void *data, void **ret_data) -{ - struct tmem_xhandle *xh; - char *p = (char *)msg->buf; - - xh = (struct tmem_xhandle *)p; - p += sizeof(struct tmem_xhandle); - (void)zcache_flush_object(xh->client_id, xh->pool_id, &xh->oid); - return 0; -} - -int ramster_remote_async_get(struct tmem_xhandle *xh, bool free, int remotenode, - size_t expect_size, uint8_t expect_cksum, - void *extra) -{ - int ret = -1, status; - struct r2nm_node *node = NULL; - struct kvec vec[1]; - size_t veclen = 1; - u32 msg_type; - - node = r2nm_get_node_by_num(remotenode); - if (node == NULL) - goto out; - xh->client_id = r2nm_this_node(); /* which node is getting */ - xh->xh_data_cksum = expect_cksum; - xh->xh_data_size = expect_size; - xh->extra = extra; - vec[0].iov_len = sizeof(*xh); - vec[0].iov_base = xh; - if (free) - msg_type = RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST; - else - msg_type = RMSTR_TMEM_ASYNC_GET_REQUEST; - ret = r2net_send_message_vec(msg_type, RMSTR_KEY, - vec, veclen, remotenode, &status); - r2nm_node_put(node); - if (ret < 0) { - /* FIXME handle bad message possibilities here? */ - pr_err("UNTESTED ret<0 in ramster_remote_async_get\n"); - } - ret = status; -out: - return ret; -} - -#ifdef RAMSTER_TESTING -/* leave me here to see if it catches a weird crash */ -static void ramster_check_irq_counts(void) -{ - static int last_hardirq_cnt, last_softirq_cnt, last_preempt_cnt; - int cur_hardirq_cnt, cur_softirq_cnt, cur_preempt_cnt; - - cur_hardirq_cnt = hardirq_count() >> HARDIRQ_SHIFT; - if (cur_hardirq_cnt > last_hardirq_cnt) { - last_hardirq_cnt = cur_hardirq_cnt; - if (!(last_hardirq_cnt&(last_hardirq_cnt-1))) - pr_err("RAMSTER TESTING RRP hardirq_count=%d\n", - last_hardirq_cnt); - } - cur_softirq_cnt = softirq_count() >> SOFTIRQ_SHIFT; - if (cur_softirq_cnt > last_softirq_cnt) { - last_softirq_cnt = cur_softirq_cnt; - if (!(last_softirq_cnt&(last_softirq_cnt-1))) - pr_err("RAMSTER TESTING RRP softirq_count=%d\n", - last_softirq_cnt); - } - cur_preempt_cnt = preempt_count() & PREEMPT_MASK; - if (cur_preempt_cnt > last_preempt_cnt) { - last_preempt_cnt = cur_preempt_cnt; - if (!(last_preempt_cnt&(last_preempt_cnt-1))) - pr_err("RAMSTER TESTING RRP preempt_count=%d\n", - last_preempt_cnt); - } -} -#endif - -int ramster_remote_put(struct tmem_xhandle *xh, char *data, size_t size, - bool ephemeral, int *remotenode) -{ - int nodenum, ret = -1, status; - struct r2nm_node *node = NULL; - struct kvec vec[2]; - size_t veclen = 2; - u32 msg_type; -#ifdef RAMSTER_TESTING - struct r2net_node *nn; -#endif - - BUG_ON(size > RMSTR_R2NET_MAX_LEN); - xh->client_id = r2nm_this_node(); /* which node is putting */ - vec[0].iov_len = sizeof(*xh); - vec[0].iov_base = xh; - vec[1].iov_len = size; - vec[1].iov_base = data; - node = r2net_target_node; - if (!node) - goto out; - - nodenum = r2net_target_nodenum; - - r2nm_node_get(node); - -#ifdef RAMSTER_TESTING - nn = r2net_nn_from_num(nodenum); - WARN_ON_ONCE(nn->nn_persistent_error || !nn->nn_sc_valid); -#endif - - if (ephemeral) - msg_type = RMSTR_TMEM_PUT_EPH; - else - msg_type = RMSTR_TMEM_PUT_PERS; -#ifdef RAMSTER_TESTING - /* leave me here to see if it catches a weird crash */ - ramster_check_irq_counts(); -#endif - - ret = r2net_send_message_vec(msg_type, RMSTR_KEY, vec, veclen, - nodenum, &status); -#ifdef RAMSTER_TESTING - if (ret != 0) { - static unsigned long cnt; - cnt++; - if (!(cnt&(cnt-1))) - pr_err("ramster_remote_put: message failed, ret=%d, cnt=%lu\n", - ret, cnt); - ret = -1; - } -#endif - if (ret < 0) - ret = -1; - else { - ret = status; - *remotenode = nodenum; - } - - r2nm_node_put(node); -out: - return ret; -} - -int ramster_remote_flush(struct tmem_xhandle *xh, int remotenode) -{ - int ret = -1, status; - struct r2nm_node *node = NULL; - struct kvec vec[1]; - size_t veclen = 1; - - node = r2nm_get_node_by_num(remotenode); - BUG_ON(node == NULL); - xh->client_id = r2nm_this_node(); /* which node is flushing */ - vec[0].iov_len = sizeof(*xh); - vec[0].iov_base = xh; - BUG_ON(irqs_disabled()); - BUG_ON(in_softirq()); - ret = r2net_send_message_vec(RMSTR_TMEM_FLUSH, RMSTR_KEY, - vec, veclen, remotenode, &status); - r2nm_node_put(node); - return ret; -} - -int ramster_remote_flush_object(struct tmem_xhandle *xh, int remotenode) -{ - int ret = -1, status; - struct r2nm_node *node = NULL; - struct kvec vec[1]; - size_t veclen = 1; - - node = r2nm_get_node_by_num(remotenode); - BUG_ON(node == NULL); - xh->client_id = r2nm_this_node(); /* which node is flobjing */ - vec[0].iov_len = sizeof(*xh); - vec[0].iov_base = xh; - ret = r2net_send_message_vec(RMSTR_TMEM_FLOBJ, RMSTR_KEY, - vec, veclen, remotenode, &status); - r2nm_node_put(node); - return ret; -} - -/* - * Handler registration - */ - -static LIST_HEAD(r2net_unreg_list); - -static void r2net_unregister_handlers(void) -{ - r2net_unregister_handler_list(&r2net_unreg_list); -} - -int r2net_register_handlers(void) -{ - int status; - - status = r2net_register_handler(RMSTR_TMEM_PUT_EPH, RMSTR_KEY, - RMSTR_R2NET_MAX_LEN, - ramster_remote_put_handler, - NULL, NULL, &r2net_unreg_list); - if (status) - goto bail; - - status = r2net_register_handler(RMSTR_TMEM_PUT_PERS, RMSTR_KEY, - RMSTR_R2NET_MAX_LEN, - ramster_remote_put_handler, - NULL, NULL, &r2net_unreg_list); - if (status) - goto bail; - - status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_REQUEST, RMSTR_KEY, - RMSTR_R2NET_MAX_LEN, - ramster_remote_async_get_request_handler, - NULL, NULL, - &r2net_unreg_list); - if (status) - goto bail; - - status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST, - RMSTR_KEY, RMSTR_R2NET_MAX_LEN, - ramster_remote_async_get_request_handler, - NULL, NULL, - &r2net_unreg_list); - if (status) - goto bail; - - status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_REPLY, RMSTR_KEY, - RMSTR_R2NET_MAX_LEN, - ramster_remote_async_get_reply_handler, - NULL, NULL, - &r2net_unreg_list); - if (status) - goto bail; - - status = r2net_register_handler(RMSTR_TMEM_FLUSH, RMSTR_KEY, - RMSTR_R2NET_MAX_LEN, - ramster_remote_flush_handler, - NULL, NULL, - &r2net_unreg_list); - if (status) - goto bail; - - status = r2net_register_handler(RMSTR_TMEM_FLOBJ, RMSTR_KEY, - RMSTR_R2NET_MAX_LEN, - ramster_remote_flobj_handler, - NULL, NULL, - &r2net_unreg_list); - if (status) - goto bail; - - pr_info("ramster: r2net handlers registered\n"); - -bail: - if (status) { - r2net_unregister_handlers(); - pr_err("ramster: couldn't register r2net handlers\n"); - } - return status; -} diff --git a/drivers/staging/ramster/ramster.h b/drivers/staging/ramster/ramster.h deleted file mode 100644 index 0c9455e8dcd8..000000000000 --- a/drivers/staging/ramster/ramster.h +++ /dev/null @@ -1,118 +0,0 @@ -/* - * ramster.h - * - * Peer-to-peer transcendent memory - * - * Copyright (c) 2009-2012, Dan Magenheimer, Oracle Corp. - */ - -#ifndef _RAMSTER_H_ -#define _RAMSTER_H_ - -/* - * format of remote pampd: - * bit 0 == intransit - * bit 1 == is_remote... if this bit is set, then - * bit 2-9 == remotenode - * bit 10-22 == size - * bit 23-30 == cksum - */ -#define FAKE_PAMPD_INTRANSIT_BITS 1 -#define FAKE_PAMPD_ISREMOTE_BITS 1 -#define FAKE_PAMPD_REMOTENODE_BITS 8 -#define FAKE_PAMPD_REMOTESIZE_BITS 13 -#define FAKE_PAMPD_CHECKSUM_BITS 8 - -#define FAKE_PAMPD_INTRANSIT_SHIFT 0 -#define FAKE_PAMPD_ISREMOTE_SHIFT (FAKE_PAMPD_INTRANSIT_SHIFT + \ - FAKE_PAMPD_INTRANSIT_BITS) -#define FAKE_PAMPD_REMOTENODE_SHIFT (FAKE_PAMPD_ISREMOTE_SHIFT + \ - FAKE_PAMPD_ISREMOTE_BITS) -#define FAKE_PAMPD_REMOTESIZE_SHIFT (FAKE_PAMPD_REMOTENODE_SHIFT + \ - FAKE_PAMPD_REMOTENODE_BITS) -#define FAKE_PAMPD_CHECKSUM_SHIFT (FAKE_PAMPD_REMOTESIZE_SHIFT + \ - FAKE_PAMPD_REMOTESIZE_BITS) - -#define FAKE_PAMPD_MASK(x) ((1UL << (x)) - 1) - -static inline void *pampd_make_remote(int remotenode, size_t size, - unsigned char cksum) -{ - unsigned long fake_pampd = 0; - fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT; - fake_pampd |= ((unsigned long)remotenode & - FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTENODE_BITS)) << - FAKE_PAMPD_REMOTENODE_SHIFT; - fake_pampd |= ((unsigned long)size & - FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTESIZE_BITS)) << - FAKE_PAMPD_REMOTESIZE_SHIFT; - fake_pampd |= ((unsigned long)cksum & - FAKE_PAMPD_MASK(FAKE_PAMPD_CHECKSUM_BITS)) << - FAKE_PAMPD_CHECKSUM_SHIFT; - return (void *)fake_pampd; -} - -static inline unsigned int pampd_remote_node(void *pampd) -{ - unsigned long fake_pampd = (unsigned long)pampd; - return (fake_pampd >> FAKE_PAMPD_REMOTENODE_SHIFT) & - FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTENODE_BITS); -} - -static inline unsigned int pampd_remote_size(void *pampd) -{ - unsigned long fake_pampd = (unsigned long)pampd; - return (fake_pampd >> FAKE_PAMPD_REMOTESIZE_SHIFT) & - FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTESIZE_BITS); -} - -static inline unsigned char pampd_remote_cksum(void *pampd) -{ - unsigned long fake_pampd = (unsigned long)pampd; - return (fake_pampd >> FAKE_PAMPD_CHECKSUM_SHIFT) & - FAKE_PAMPD_MASK(FAKE_PAMPD_CHECKSUM_BITS); -} - -static inline bool pampd_is_remote(void *pampd) -{ - unsigned long fake_pampd = (unsigned long)pampd; - return (fake_pampd >> FAKE_PAMPD_ISREMOTE_SHIFT) & - FAKE_PAMPD_MASK(FAKE_PAMPD_ISREMOTE_BITS); -} - -static inline bool pampd_is_intransit(void *pampd) -{ - unsigned long fake_pampd = (unsigned long)pampd; - return (fake_pampd >> FAKE_PAMPD_INTRANSIT_SHIFT) & - FAKE_PAMPD_MASK(FAKE_PAMPD_INTRANSIT_BITS); -} - -/* note that it is a BUG for intransit to be set without isremote also set */ -static inline void *pampd_mark_intransit(void *pampd) -{ - unsigned long fake_pampd = (unsigned long)pampd; - - fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT; - fake_pampd |= 1UL << FAKE_PAMPD_INTRANSIT_SHIFT; - return (void *)fake_pampd; -} - -static inline void *pampd_mask_intransit_and_remote(void *marked_pampd) -{ - unsigned long pampd = (unsigned long)marked_pampd; - - pampd &= ~(1UL << FAKE_PAMPD_INTRANSIT_SHIFT); - pampd &= ~(1UL << FAKE_PAMPD_ISREMOTE_SHIFT); - return (void *)pampd; -} - -extern int ramster_remote_async_get(struct tmem_xhandle *, - bool, int, size_t, uint8_t, void *extra); -extern int ramster_remote_put(struct tmem_xhandle *, char *, size_t, - bool, int *); -extern int ramster_remote_flush(struct tmem_xhandle *, int); -extern int ramster_remote_flush_object(struct tmem_xhandle *, int); -extern int r2net_register_handlers(void); -extern int r2net_remote_target_node_set(int); - -#endif /* _TMEM_H */ diff --git a/drivers/staging/ramster/tmem.c b/drivers/staging/ramster/tmem.c deleted file mode 100644 index 8f2f6892d8d3..000000000000 --- a/drivers/staging/ramster/tmem.c +++ /dev/null @@ -1,851 +0,0 @@ -/* - * In-kernel transcendent memory (generic implementation) - * - * Copyright (c) 2009-2011, Dan Magenheimer, Oracle Corp. - * - * The primary purpose of Transcedent Memory ("tmem") is to map object-oriented - * "handles" (triples containing a pool id, and object id, and an index), to - * pages in a page-accessible memory (PAM). Tmem references the PAM pages via - * an abstract "pampd" (PAM page-descriptor), which can be operated on by a - * set of functions (pamops). Each pampd contains some representation of - * PAGE_SIZE bytes worth of data. Tmem must support potentially millions of - * pages and must be able to insert, find, and delete these pages at a - * potential frequency of thousands per second concurrently across many CPUs, - * (and, if used with KVM, across many vcpus across many guests). - * Tmem is tracked with a hierarchy of data structures, organized by - * the elements in a handle-tuple: pool_id, object_id, and page index. - * One or more "clients" (e.g. guests) each provide one or more tmem_pools. - * Each pool, contains a hash table of rb_trees of tmem_objs. Each - * tmem_obj contains a radix-tree-like tree of pointers, with intermediate - * nodes called tmem_objnodes. Each leaf pointer in this tree points to - * a pampd, which is accessible only through a small set of callbacks - * registered by the PAM implementation (see tmem_register_pamops). Tmem - * does all memory allocation via a set of callbacks registered by the tmem - * host implementation (e.g. see tmem_register_hostops). - */ - -#include <linux/list.h> -#include <linux/spinlock.h> -#include <linux/atomic.h> -#include <linux/delay.h> - -#include "tmem.h" - -/* data structure sentinels used for debugging... see tmem.h */ -#define POOL_SENTINEL 0x87658765 -#define OBJ_SENTINEL 0x12345678 -#define OBJNODE_SENTINEL 0xfedcba09 - -/* - * A tmem host implementation must use this function to register callbacks - * for memory allocation. - */ -static struct tmem_hostops tmem_hostops; - -static void tmem_objnode_tree_init(void); - -void tmem_register_hostops(struct tmem_hostops *m) -{ - tmem_objnode_tree_init(); - tmem_hostops = *m; -} - -/* - * A tmem host implementation must use this function to register - * callbacks for a page-accessible memory (PAM) implementation - */ -static struct tmem_pamops tmem_pamops; - -void tmem_register_pamops(struct tmem_pamops *m) -{ - tmem_pamops = *m; -} - -/* - * Oid's are potentially very sparse and tmem_objs may have an indeterminately - * short life, being added and deleted at a relatively high frequency. - * So an rb_tree is an ideal data structure to manage tmem_objs. But because - * of the potentially huge number of tmem_objs, each pool manages a hashtable - * of rb_trees to reduce search, insert, delete, and rebalancing time. - * Each hashbucket also has a lock to manage concurrent access. - * - * The following routines manage tmem_objs. When any tmem_obj is accessed, - * the hashbucket lock must be held. - */ - -/* searches for object==oid in pool, returns locked object if found */ -static struct tmem_obj *tmem_obj_find(struct tmem_hashbucket *hb, - struct tmem_oid *oidp) -{ - struct rb_node *rbnode; - struct tmem_obj *obj; - - rbnode = hb->obj_rb_root.rb_node; - while (rbnode) { - BUG_ON(RB_EMPTY_NODE(rbnode)); - obj = rb_entry(rbnode, struct tmem_obj, rb_tree_node); - switch (tmem_oid_compare(oidp, &obj->oid)) { - case 0: /* equal */ - goto out; - case -1: - rbnode = rbnode->rb_left; - break; - case 1: - rbnode = rbnode->rb_right; - break; - } - } - obj = NULL; -out: - return obj; -} - -static void tmem_pampd_destroy_all_in_obj(struct tmem_obj *); - -/* free an object that has no more pampds in it */ -static void tmem_obj_free(struct tmem_obj *obj, struct tmem_hashbucket *hb) -{ - struct tmem_pool *pool; - - BUG_ON(obj == NULL); - ASSERT_SENTINEL(obj, OBJ); - BUG_ON(obj->pampd_count > 0); - pool = obj->pool; - BUG_ON(pool == NULL); - if (obj->objnode_tree_root != NULL) /* may be "stump" with no leaves */ - tmem_pampd_destroy_all_in_obj(obj); - BUG_ON(obj->objnode_tree_root != NULL); - BUG_ON((long)obj->objnode_count != 0); - atomic_dec(&pool->obj_count); - BUG_ON(atomic_read(&pool->obj_count) < 0); - INVERT_SENTINEL(obj, OBJ); - obj->pool = NULL; - tmem_oid_set_invalid(&obj->oid); - rb_erase(&obj->rb_tree_node, &hb->obj_rb_root); -} - -/* - * initialize, and insert an tmem_object_root (called only if find failed) - */ -static void tmem_obj_init(struct tmem_obj *obj, struct tmem_hashbucket *hb, - struct tmem_pool *pool, - struct tmem_oid *oidp) -{ - struct rb_root *root = &hb->obj_rb_root; - struct rb_node **new = &(root->rb_node), *parent = NULL; - struct tmem_obj *this; - - BUG_ON(pool == NULL); - atomic_inc(&pool->obj_count); - obj->objnode_tree_height = 0; - obj->objnode_tree_root = NULL; - obj->pool = pool; - obj->oid = *oidp; - obj->objnode_count = 0; - obj->pampd_count = 0; - (*tmem_pamops.new_obj)(obj); - SET_SENTINEL(obj, OBJ); - while (*new) { - BUG_ON(RB_EMPTY_NODE(*new)); - this = rb_entry(*new, struct tmem_obj, rb_tree_node); - parent = *new; - switch (tmem_oid_compare(oidp, &this->oid)) { - case 0: - BUG(); /* already present; should never happen! */ - break; - case -1: - new = &(*new)->rb_left; - break; - case 1: - new = &(*new)->rb_right; - break; - } - } - rb_link_node(&obj->rb_tree_node, parent, new); - rb_insert_color(&obj->rb_tree_node, root); -} - -/* - * Tmem is managed as a set of tmem_pools with certain attributes, such as - * "ephemeral" vs "persistent". These attributes apply to all tmem_objs - * and all pampds that belong to a tmem_pool. A tmem_pool is created - * or deleted relatively rarely (for example, when a filesystem is - * mounted or unmounted. - */ - -/* flush all data from a pool and, optionally, free it */ -static void tmem_pool_flush(struct tmem_pool *pool, bool destroy) -{ - struct rb_node *rbnode; - struct tmem_obj *obj; - struct tmem_hashbucket *hb = &pool->hashbucket[0]; - int i; - - BUG_ON(pool == NULL); - for (i = 0; i < TMEM_HASH_BUCKETS; i++, hb++) { - spin_lock(&hb->lock); - rbnode = rb_first(&hb->obj_rb_root); - while (rbnode != NULL) { - obj = rb_entry(rbnode, struct tmem_obj, rb_tree_node); - rbnode = rb_next(rbnode); - tmem_pampd_destroy_all_in_obj(obj); - tmem_obj_free(obj, hb); - (*tmem_hostops.obj_free)(obj, pool); - } - spin_unlock(&hb->lock); - } - if (destroy) - list_del(&pool->pool_list); -} - -/* - * A tmem_obj contains a radix-tree-like tree in which the intermediate - * nodes are called tmem_objnodes. (The kernel lib/radix-tree.c implementation - * is very specialized and tuned for specific uses and is not particularly - * suited for use from this code, though some code from the core algorithms has - * been reused, thus the copyright notices below). Each tmem_objnode contains - * a set of pointers which point to either a set of intermediate tmem_objnodes - * or a set of of pampds. - * - * Portions Copyright (C) 2001 Momchil Velikov - * Portions Copyright (C) 2001 Christoph Hellwig - * Portions Copyright (C) 2005 SGI, Christoph Lameter <clameter@sgi.com> - */ - -struct tmem_objnode_tree_path { - struct tmem_objnode *objnode; - int offset; -}; - -/* objnode height_to_maxindex translation */ -static unsigned long tmem_objnode_tree_h2max[OBJNODE_TREE_MAX_PATH + 1]; - -static void tmem_objnode_tree_init(void) -{ - unsigned int ht, tmp; - - for (ht = 0; ht < ARRAY_SIZE(tmem_objnode_tree_h2max); ht++) { - tmp = ht * OBJNODE_TREE_MAP_SHIFT; - if (tmp >= OBJNODE_TREE_INDEX_BITS) - tmem_objnode_tree_h2max[ht] = ~0UL; - else - tmem_objnode_tree_h2max[ht] = - (~0UL >> (OBJNODE_TREE_INDEX_BITS - tmp - 1)) >> 1; - } -} - -static struct tmem_objnode *tmem_objnode_alloc(struct tmem_obj *obj) -{ - struct tmem_objnode *objnode; - - ASSERT_SENTINEL(obj, OBJ); - BUG_ON(obj->pool == NULL); - ASSERT_SENTINEL(obj->pool, POOL); - objnode = (*tmem_hostops.objnode_alloc)(obj->pool); - if (unlikely(objnode == NULL)) - goto out; - objnode->obj = obj; - SET_SENTINEL(objnode, OBJNODE); - memset(&objnode->slots, 0, sizeof(objnode->slots)); - objnode->slots_in_use = 0; - obj->objnode_count++; -out: - return objnode; -} - -static void tmem_objnode_free(struct tmem_objnode *objnode) -{ - struct tmem_pool *pool; - int i; - - BUG_ON(objnode == NULL); - for (i = 0; i < OBJNODE_TREE_MAP_SIZE; i++) - BUG_ON(objnode->slots[i] != NULL); - ASSERT_SENTINEL(objnode, OBJNODE); - INVERT_SENTINEL(objnode, OBJNODE); - BUG_ON(objnode->obj == NULL); - ASSERT_SENTINEL(objnode->obj, OBJ); - pool = objnode->obj->pool; - BUG_ON(pool == NULL); - ASSERT_SENTINEL(pool, POOL); - objnode->obj->objnode_count--; - objnode->obj = NULL; - (*tmem_hostops.objnode_free)(objnode, pool); -} - -/* - * lookup index in object and return associated pampd (or NULL if not found) - */ -static void **__tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index) -{ - unsigned int height, shift; - struct tmem_objnode **slot = NULL; - - BUG_ON(obj == NULL); - ASSERT_SENTINEL(obj, OBJ); - BUG_ON(obj->pool == NULL); - ASSERT_SENTINEL(obj->pool, POOL); - - height = obj->objnode_tree_height; - if (index > tmem_objnode_tree_h2max[obj->objnode_tree_height]) - goto out; - if (height == 0 && obj->objnode_tree_root) { - slot = &obj->objnode_tree_root; - goto out; - } - shift = (height-1) * OBJNODE_TREE_MAP_SHIFT; - slot = &obj->objnode_tree_root; - while (height > 0) { - if (*slot == NULL) - goto out; - slot = (struct tmem_objnode **) - ((*slot)->slots + - ((index >> shift) & OBJNODE_TREE_MAP_MASK)); - shift -= OBJNODE_TREE_MAP_SHIFT; - height--; - } -out: - return slot != NULL ? (void **)slot : NULL; -} - -static void *tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index) -{ - struct tmem_objnode **slot; - - slot = (struct tmem_objnode **)__tmem_pampd_lookup_in_obj(obj, index); - return slot != NULL ? *slot : NULL; -} - -static void *tmem_pampd_replace_in_obj(struct tmem_obj *obj, uint32_t index, - void *new_pampd, bool no_free) -{ - struct tmem_objnode **slot; - void *ret = NULL; - - slot = (struct tmem_objnode **)__tmem_pampd_lookup_in_obj(obj, index); - if ((slot != NULL) && (*slot != NULL)) { - void *old_pampd = *(void **)slot; - *(void **)slot = new_pampd; - if (!no_free) - (*tmem_pamops.free)(old_pampd, obj->pool, - NULL, 0, false); - ret = new_pampd; - } - return ret; -} - -static int tmem_pampd_add_to_obj(struct tmem_obj *obj, uint32_t index, - void *pampd) -{ - int ret = 0; - struct tmem_objnode *objnode = NULL, *newnode, *slot; - unsigned int height, shift; - int offset = 0; - - /* if necessary, extend the tree to be higher */ - if (index > tmem_objnode_tree_h2max[obj->objnode_tree_height]) { - height = obj->objnode_tree_height + 1; - if (index > tmem_objnode_tree_h2max[height]) - while (index > tmem_objnode_tree_h2max[height]) - height++; - if (obj->objnode_tree_root == NULL) { - obj->objnode_tree_height = height; - goto insert; - } - do { - newnode = tmem_objnode_alloc(obj); - if (!newnode) { - ret = -ENOMEM; - goto out; - } - newnode->slots[0] = obj->objnode_tree_root; - newnode->slots_in_use = 1; - obj->objnode_tree_root = newnode; - obj->objnode_tree_height++; - } while (height > obj->objnode_tree_height); - } -insert: - slot = obj->objnode_tree_root; - height = obj->objnode_tree_height; - shift = (height-1) * OBJNODE_TREE_MAP_SHIFT; - while (height > 0) { - if (slot == NULL) { - /* add a child objnode. */ - slot = tmem_objnode_alloc(obj); - if (!slot) { - ret = -ENOMEM; - goto out; - } - if (objnode) { - - objnode->slots[offset] = slot; - objnode->slots_in_use++; - } else - obj->objnode_tree_root = slot; - } - /* go down a level */ - offset = (index >> shift) & OBJNODE_TREE_MAP_MASK; - objnode = slot; - slot = objnode->slots[offset]; - shift -= OBJNODE_TREE_MAP_SHIFT; - height--; - } - BUG_ON(slot != NULL); - if (objnode) { - objnode->slots_in_use++; - objnode->slots[offset] = pampd; - } else - obj->objnode_tree_root = pampd; - obj->pampd_count++; -out: - return ret; -} - -static void *tmem_pampd_delete_from_obj(struct tmem_obj *obj, uint32_t index) -{ - struct tmem_objnode_tree_path path[OBJNODE_TREE_MAX_PATH + 1]; - struct tmem_objnode_tree_path *pathp = path; - struct tmem_objnode *slot = NULL; - unsigned int height, shift; - int offset; - - BUG_ON(obj == NULL); - ASSERT_SENTINEL(obj, OBJ); - BUG_ON(obj->pool == NULL); - ASSERT_SENTINEL(obj->pool, POOL); - height = obj->objnode_tree_height; - if (index > tmem_objnode_tree_h2max[height]) - goto out; - slot = obj->objnode_tree_root; - if (height == 0 && obj->objnode_tree_root) { - obj->objnode_tree_root = NULL; - goto out; - } - shift = (height - 1) * OBJNODE_TREE_MAP_SHIFT; - pathp->objnode = NULL; - do { - if (slot == NULL) - goto out; - pathp++; - offset = (index >> shift) & OBJNODE_TREE_MAP_MASK; - pathp->offset = offset; - pathp->objnode = slot; - slot = slot->slots[offset]; - shift -= OBJNODE_TREE_MAP_SHIFT; - height--; - } while (height > 0); - if (slot == NULL) - goto out; - while (pathp->objnode) { - pathp->objnode->slots[pathp->offset] = NULL; - pathp->objnode->slots_in_use--; - if (pathp->objnode->slots_in_use) { - if (pathp->objnode == obj->objnode_tree_root) { - while (obj->objnode_tree_height > 0 && - obj->objnode_tree_root->slots_in_use == 1 && - obj->objnode_tree_root->slots[0]) { - struct tmem_objnode *to_free = - obj->objnode_tree_root; - - obj->objnode_tree_root = - to_free->slots[0]; - obj->objnode_tree_height--; - to_free->slots[0] = NULL; - to_free->slots_in_use = 0; - tmem_objnode_free(to_free); - } - } - goto out; - } - tmem_objnode_free(pathp->objnode); /* 0 slots used, free it */ - pathp--; - } - obj->objnode_tree_height = 0; - obj->objnode_tree_root = NULL; - -out: - if (slot != NULL) - obj->pampd_count--; - BUG_ON(obj->pampd_count < 0); - return slot; -} - -/* recursively walk the objnode_tree destroying pampds and objnodes */ -static void tmem_objnode_node_destroy(struct tmem_obj *obj, - struct tmem_objnode *objnode, - unsigned int ht) -{ - int i; - - if (ht == 0) - return; - for (i = 0; i < OBJNODE_TREE_MAP_SIZE; i++) { - if (objnode->slots[i]) { - if (ht == 1) { - obj->pampd_count--; - (*tmem_pamops.free)(objnode->slots[i], - obj->pool, NULL, 0, true); - objnode->slots[i] = NULL; - continue; - } - tmem_objnode_node_destroy(obj, objnode->slots[i], ht-1); - tmem_objnode_free(objnode->slots[i]); - objnode->slots[i] = NULL; - } - } -} - -static void tmem_pampd_destroy_all_in_obj(struct tmem_obj *obj) -{ - if (obj->objnode_tree_root == NULL) - return; - if (obj->objnode_tree_height == 0) { - obj->pampd_count--; - (*tmem_pamops.free)(obj->objnode_tree_root, - obj->pool, NULL, 0, true); - } else { - tmem_objnode_node_destroy(obj, obj->objnode_tree_root, - obj->objnode_tree_height); - tmem_objnode_free(obj->objnode_tree_root); - obj->objnode_tree_height = 0; - } - obj->objnode_tree_root = NULL; - (*tmem_pamops.free_obj)(obj->pool, obj); -} - -/* - * Tmem is operated on by a set of well-defined actions: - * "put", "get", "flush", "flush_object", "new pool" and "destroy pool". - * (The tmem ABI allows for subpages and exchanges but these operations - * are not included in this implementation.) - * - * These "tmem core" operations are implemented in the following functions. - */ - -/* - * "Put" a page, e.g. copy a page from the kernel into newly allocated - * PAM space (if such space is available). Tmem_put is complicated by - * a corner case: What if a page with matching handle already exists in - * tmem? To guarantee coherency, one of two actions is necessary: Either - * the data for the page must be overwritten, or the page must be - * "flushed" so that the data is not accessible to a subsequent "get". - * Since these "duplicate puts" are relatively rare, this implementation - * always flushes for simplicity. - */ -int tmem_put(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index, - char *data, size_t size, bool raw, int ephemeral) -{ - struct tmem_obj *obj = NULL, *objfound = NULL, *objnew = NULL; - void *pampd = NULL, *pampd_del = NULL; - int ret = -ENOMEM; - struct tmem_hashbucket *hb; - - hb = &pool->hashbucket[tmem_oid_hash(oidp)]; - spin_lock(&hb->lock); - obj = objfound = tmem_obj_find(hb, oidp); - if (obj != NULL) { - pampd = tmem_pampd_lookup_in_obj(objfound, index); - if (pampd != NULL) { - /* if found, is a dup put, flush the old one */ - pampd_del = tmem_pampd_delete_from_obj(obj, index); - BUG_ON(pampd_del != pampd); - (*tmem_pamops.free)(pampd, pool, oidp, index, true); - if (obj->pampd_count == 0) { - objnew = obj; - objfound = NULL; - } - pampd = NULL; - } - } else { - obj = objnew = (*tmem_hostops.obj_alloc)(pool); - if (unlikely(obj == NULL)) { - ret = -ENOMEM; - goto out; - } - tmem_obj_init(obj, hb, pool, oidp); - } - BUG_ON(obj == NULL); - BUG_ON(((objnew != obj) && (objfound != obj)) || (objnew == objfound)); - pampd = (*tmem_pamops.create)(data, size, raw, ephemeral, - obj->pool, &obj->oid, index); - if (unlikely(pampd == NULL)) - goto free; - ret = tmem_pampd_add_to_obj(obj, index, pampd); - if (unlikely(ret == -ENOMEM)) - /* may have partially built objnode tree ("stump") */ - goto delete_and_free; - goto out; - -delete_and_free: - (void)tmem_pampd_delete_from_obj(obj, index); -free: - if (pampd) - (*tmem_pamops.free)(pampd, pool, NULL, 0, true); - if (objnew) { - tmem_obj_free(objnew, hb); - (*tmem_hostops.obj_free)(objnew, pool); - } -out: - spin_unlock(&hb->lock); - return ret; -} - -void *tmem_localify_get_pampd(struct tmem_pool *pool, struct tmem_oid *oidp, - uint32_t index, struct tmem_obj **ret_obj, - void **saved_hb) -{ - struct tmem_hashbucket *hb; - struct tmem_obj *obj = NULL; - void *pampd = NULL; - - hb = &pool->hashbucket[tmem_oid_hash(oidp)]; - spin_lock(&hb->lock); - obj = tmem_obj_find(hb, oidp); - if (likely(obj != NULL)) - pampd = tmem_pampd_lookup_in_obj(obj, index); - *ret_obj = obj; - *saved_hb = (void *)hb; - /* note, hashbucket remains locked */ - return pampd; -} - -void tmem_localify_finish(struct tmem_obj *obj, uint32_t index, - void *pampd, void *saved_hb, bool delete) -{ - struct tmem_hashbucket *hb = (struct tmem_hashbucket *)saved_hb; - - BUG_ON(!spin_is_locked(&hb->lock)); - if (pampd != NULL) { - BUG_ON(obj == NULL); - (void)tmem_pampd_replace_in_obj(obj, index, pampd, 1); - } else if (delete) { - BUG_ON(obj == NULL); - (void)tmem_pampd_delete_from_obj(obj, index); - } - spin_unlock(&hb->lock); -} - -static int tmem_repatriate(void **ppampd, struct tmem_hashbucket *hb, - struct tmem_pool *pool, struct tmem_oid *oidp, - uint32_t index, bool free, char *data) -{ - void *old_pampd = *ppampd, *new_pampd = NULL; - bool intransit = false; - int ret = 0; - - - if (!is_ephemeral(pool)) - new_pampd = (*tmem_pamops.repatriate_preload)( - old_pampd, pool, oidp, index, &intransit); - if (intransit) - ret = -EAGAIN; - else if (new_pampd != NULL) - *ppampd = new_pampd; - /* must release the hb->lock else repatriate can't sleep */ - spin_unlock(&hb->lock); - if (!intransit) - ret = (*tmem_pamops.repatriate)(old_pampd, new_pampd, pool, - oidp, index, free, data); - return ret; -} - -/* - * "Get" a page, e.g. if one can be found, copy the tmem page with the - * matching handle from PAM space to the kernel. By tmem definition, - * when a "get" is successful on an ephemeral page, the page is "flushed", - * and when a "get" is successful on a persistent page, the page is retained - * in tmem. Note that to preserve - * coherency, "get" can never be skipped if tmem contains the data. - * That is, if a get is done with a certain handle and fails, any - * subsequent "get" must also fail (unless of course there is a - * "put" done with the same handle). - - */ -int tmem_get(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index, - char *data, size_t *size, bool raw, int get_and_free) -{ - struct tmem_obj *obj; - void *pampd; - bool ephemeral = is_ephemeral(pool); - int ret = -1; - struct tmem_hashbucket *hb; - bool free = (get_and_free == 1) || ((get_and_free == 0) && ephemeral); - bool lock_held = 0; - void **ppampd; - -again: - hb = &pool->hashbucket[tmem_oid_hash(oidp)]; - spin_lock(&hb->lock); - lock_held = 1; - obj = tmem_obj_find(hb, oidp); - if (obj == NULL) - goto out; - ppampd = __tmem_pampd_lookup_in_obj(obj, index); - if (ppampd == NULL) - goto out; - if (tmem_pamops.is_remote(*ppampd)) { - ret = tmem_repatriate(ppampd, hb, pool, oidp, - index, free, data); - lock_held = 0; /* note hb->lock has been unlocked */ - if (ret == -EAGAIN) { - /* rare I think, but should cond_resched()??? */ - usleep_range(10, 1000); - goto again; - } else if (ret != 0) { - if (ret != -ENOENT) - pr_err("UNTESTED case in tmem_get, ret=%d\n", - ret); - ret = -1; - goto out; - } - goto out; - } - if (free) - pampd = tmem_pampd_delete_from_obj(obj, index); - else - pampd = tmem_pampd_lookup_in_obj(obj, index); - if (pampd == NULL) - goto out; - if (free) { - if (obj->pampd_count == 0) { - tmem_obj_free(obj, hb); - (*tmem_hostops.obj_free)(obj, pool); - obj = NULL; - } - } - if (free) - ret = (*tmem_pamops.get_data_and_free)( - data, size, raw, pampd, pool, oidp, index); - else - ret = (*tmem_pamops.get_data)( - data, size, raw, pampd, pool, oidp, index); - if (ret < 0) - goto out; - ret = 0; -out: - if (lock_held) - spin_unlock(&hb->lock); - return ret; -} - -/* - * If a page in tmem matches the handle, "flush" this page from tmem such - * that any subsequent "get" does not succeed (unless, of course, there - * was another "put" with the same handle). - */ -int tmem_flush_page(struct tmem_pool *pool, - struct tmem_oid *oidp, uint32_t index) -{ - struct tmem_obj *obj; - void *pampd; - int ret = -1; - struct tmem_hashbucket *hb; - - hb = &pool->hashbucket[tmem_oid_hash(oidp)]; - spin_lock(&hb->lock); - obj = tmem_obj_find(hb, oidp); - if (obj == NULL) - goto out; - pampd = tmem_pampd_delete_from_obj(obj, index); - if (pampd == NULL) - goto out; - (*tmem_pamops.free)(pampd, pool, oidp, index, true); - if (obj->pampd_count == 0) { - tmem_obj_free(obj, hb); - (*tmem_hostops.obj_free)(obj, pool); - } - ret = 0; - -out: - spin_unlock(&hb->lock); - return ret; -} - -/* - * If a page in tmem matches the handle, replace the page so that any - * subsequent "get" gets the new page. Returns the new page if - * there was a page to replace, else returns NULL. - */ -int tmem_replace(struct tmem_pool *pool, struct tmem_oid *oidp, - uint32_t index, void *new_pampd) -{ - struct tmem_obj *obj; - int ret = -1; - struct tmem_hashbucket *hb; - - hb = &pool->hashbucket[tmem_oid_hash(oidp)]; - spin_lock(&hb->lock); - obj = tmem_obj_find(hb, oidp); - if (obj == NULL) - goto out; - new_pampd = tmem_pampd_replace_in_obj(obj, index, new_pampd, 0); - ret = (*tmem_pamops.replace_in_obj)(new_pampd, obj); -out: - spin_unlock(&hb->lock); - return ret; -} - -/* - * "Flush" all pages in tmem matching this oid. - */ -int tmem_flush_object(struct tmem_pool *pool, struct tmem_oid *oidp) -{ - struct tmem_obj *obj; - struct tmem_hashbucket *hb; - int ret = -1; - - hb = &pool->hashbucket[tmem_oid_hash(oidp)]; - spin_lock(&hb->lock); - obj = tmem_obj_find(hb, oidp); - if (obj == NULL) - goto out; - tmem_pampd_destroy_all_in_obj(obj); - tmem_obj_free(obj, hb); - (*tmem_hostops.obj_free)(obj, pool); - ret = 0; - -out: - spin_unlock(&hb->lock); - return ret; -} - -/* - * "Flush" all pages (and tmem_objs) from this tmem_pool and disable - * all subsequent access to this tmem_pool. - */ -int tmem_destroy_pool(struct tmem_pool *pool) -{ - int ret = -1; - - if (pool == NULL) - goto out; - tmem_pool_flush(pool, 1); - ret = 0; -out: - return ret; -} - -static LIST_HEAD(tmem_global_pool_list); - -/* - * Create a new tmem_pool with the provided flag and return - * a pool id provided by the tmem host implementation. - */ -void tmem_new_pool(struct tmem_pool *pool, uint32_t flags) -{ - int persistent = flags & TMEM_POOL_PERSIST; - int shared = flags & TMEM_POOL_SHARED; - struct tmem_hashbucket *hb = &pool->hashbucket[0]; - int i; - - for (i = 0; i < TMEM_HASH_BUCKETS; i++, hb++) { - hb->obj_rb_root = RB_ROOT; - spin_lock_init(&hb->lock); - } - INIT_LIST_HEAD(&pool->pool_list); - atomic_set(&pool->obj_count, 0); - SET_SENTINEL(pool, POOL); - list_add_tail(&pool->pool_list, &tmem_global_pool_list); - pool->persistent = persistent; - pool->shared = shared; -} diff --git a/drivers/staging/ramster/tmem.h b/drivers/staging/ramster/tmem.h deleted file mode 100644 index 47f1918c8314..000000000000 --- a/drivers/staging/ramster/tmem.h +++ /dev/null @@ -1,244 +0,0 @@ -/* - * tmem.h - * - * Transcendent memory - * - * Copyright (c) 2009-2011, Dan Magenheimer, Oracle Corp. - */ - -#ifndef _TMEM_H_ -#define _TMEM_H_ - -#include <linux/highmem.h> -#include <linux/hash.h> -#include <linux/atomic.h> - -/* - * These are pre-defined by the Xen<->Linux ABI - */ -#define TMEM_PUT_PAGE 4 -#define TMEM_GET_PAGE 5 -#define TMEM_FLUSH_PAGE 6 -#define TMEM_FLUSH_OBJECT 7 -#define TMEM_POOL_PERSIST 1 -#define TMEM_POOL_SHARED 2 -#define TMEM_POOL_PRECOMPRESSED 4 -#define TMEM_POOL_PAGESIZE_SHIFT 4 -#define TMEM_POOL_PAGESIZE_MASK 0xf -#define TMEM_POOL_RESERVED_BITS 0x00ffff00 - -/* - * sentinels have proven very useful for debugging but can be removed - * or disabled before final merge. - */ -#define SENTINELS -#ifdef SENTINELS -#define DECL_SENTINEL uint32_t sentinel; -#define SET_SENTINEL(_x, _y) (_x->sentinel = _y##_SENTINEL) -#define INVERT_SENTINEL(_x, _y) (_x->sentinel = ~_y##_SENTINEL) -#define ASSERT_SENTINEL(_x, _y) WARN_ON(_x->sentinel != _y##_SENTINEL) -#define ASSERT_INVERTED_SENTINEL(_x, _y) WARN_ON(_x->sentinel != ~_y##_SENTINEL) -#else -#define DECL_SENTINEL -#define SET_SENTINEL(_x, _y) do { } while (0) -#define INVERT_SENTINEL(_x, _y) do { } while (0) -#define ASSERT_SENTINEL(_x, _y) do { } while (0) -#define ASSERT_INVERTED_SENTINEL(_x, _y) do { } while (0) -#endif - -#define ASSERT_SPINLOCK(_l) WARN_ON(!spin_is_locked(_l)) - -/* - * A pool is the highest-level data structure managed by tmem and - * usually corresponds to a large independent set of pages such as - * a filesystem. Each pool has an id, and certain attributes and counters. - * It also contains a set of hash buckets, each of which contains an rbtree - * of objects and a lock to manage concurrency within the pool. - */ - -#define TMEM_HASH_BUCKET_BITS 8 -#define TMEM_HASH_BUCKETS (1<<TMEM_HASH_BUCKET_BITS) - -struct tmem_hashbucket { - struct rb_root obj_rb_root; - spinlock_t lock; -}; - -struct tmem_pool { - void *client; /* "up" for some clients, avoids table lookup */ - struct list_head pool_list; - uint32_t pool_id; - bool persistent; - bool shared; - atomic_t obj_count; - atomic_t refcount; - struct tmem_hashbucket hashbucket[TMEM_HASH_BUCKETS]; - DECL_SENTINEL -}; - -#define is_persistent(_p) (_p->persistent) -#define is_ephemeral(_p) (!(_p->persistent)) - -/* - * An object id ("oid") is large: 192-bits (to ensure, for example, files - * in a modern filesystem can be uniquely identified). - */ - -struct tmem_oid { - uint64_t oid[3]; -}; - -struct tmem_xhandle { - uint8_t client_id; - uint8_t xh_data_cksum; - uint16_t xh_data_size; - uint16_t pool_id; - struct tmem_oid oid; - uint32_t index; - void *extra; -}; - -static inline struct tmem_xhandle tmem_xhandle_fill(uint16_t client_id, - struct tmem_pool *pool, - struct tmem_oid *oidp, - uint32_t index) -{ - struct tmem_xhandle xh; - xh.client_id = client_id; - xh.xh_data_cksum = (uint8_t)-1; - xh.xh_data_size = (uint16_t)-1; - xh.pool_id = pool->pool_id; - xh.oid = *oidp; - xh.index = index; - return xh; -} - -static inline void tmem_oid_set_invalid(struct tmem_oid *oidp) -{ - oidp->oid[0] = oidp->oid[1] = oidp->oid[2] = -1UL; -} - -static inline bool tmem_oid_valid(struct tmem_oid *oidp) -{ - return oidp->oid[0] != -1UL || oidp->oid[1] != -1UL || - oidp->oid[2] != -1UL; -} - -static inline int tmem_oid_compare(struct tmem_oid *left, - struct tmem_oid *right) -{ - int ret; - - if (left->oid[2] == right->oid[2]) { - if (left->oid[1] == right->oid[1]) { - if (left->oid[0] == right->oid[0]) - ret = 0; - else if (left->oid[0] < right->oid[0]) - ret = -1; - else - return 1; - } else if (left->oid[1] < right->oid[1]) - ret = -1; - else - ret = 1; - } else if (left->oid[2] < right->oid[2]) - ret = -1; - else - ret = 1; - return ret; -} - -static inline unsigned tmem_oid_hash(struct tmem_oid *oidp) -{ - return hash_long(oidp->oid[0] ^ oidp->oid[1] ^ oidp->oid[2], - TMEM_HASH_BUCKET_BITS); -} - -/* - * A tmem_obj contains an identifier (oid), pointers to the parent - * pool and the rb_tree to which it belongs, counters, and an ordered - * set of pampds, structured in a radix-tree-like tree. The intermediate - * nodes of the tree are called tmem_objnodes. - */ - -struct tmem_objnode; - -struct tmem_obj { - struct tmem_oid oid; - struct tmem_pool *pool; - struct rb_node rb_tree_node; - struct tmem_objnode *objnode_tree_root; - unsigned int objnode_tree_height; - unsigned long objnode_count; - long pampd_count; - /* for current design of ramster, all pages belonging to - * an object reside on the same remotenode and extra is - * used to record the number of the remotenode so a - * flush-object operation can specify it */ - void *extra; /* for use by pampd implementation */ - DECL_SENTINEL -}; - -#define OBJNODE_TREE_MAP_SHIFT 6 -#define OBJNODE_TREE_MAP_SIZE (1UL << OBJNODE_TREE_MAP_SHIFT) -#define OBJNODE_TREE_MAP_MASK (OBJNODE_TREE_MAP_SIZE-1) -#define OBJNODE_TREE_INDEX_BITS (8 /* CHAR_BIT */ * sizeof(unsigned long)) -#define OBJNODE_TREE_MAX_PATH \ - (OBJNODE_TREE_INDEX_BITS/OBJNODE_TREE_MAP_SHIFT + 2) - -struct tmem_objnode { - struct tmem_obj *obj; - DECL_SENTINEL - void *slots[OBJNODE_TREE_MAP_SIZE]; - unsigned int slots_in_use; -}; - -/* pampd abstract datatype methods provided by the PAM implementation */ -struct tmem_pamops { - void *(*create)(char *, size_t, bool, int, - struct tmem_pool *, struct tmem_oid *, uint32_t); - int (*get_data)(char *, size_t *, bool, void *, struct tmem_pool *, - struct tmem_oid *, uint32_t); - int (*get_data_and_free)(char *, size_t *, bool, void *, - struct tmem_pool *, struct tmem_oid *, - uint32_t); - void (*free)(void *, struct tmem_pool *, - struct tmem_oid *, uint32_t, bool); - void (*free_obj)(struct tmem_pool *, struct tmem_obj *); - bool (*is_remote)(void *); - void *(*repatriate_preload)(void *, struct tmem_pool *, - struct tmem_oid *, uint32_t, bool *); - int (*repatriate)(void *, void *, struct tmem_pool *, - struct tmem_oid *, uint32_t, bool, void *); - void (*new_obj)(struct tmem_obj *); - int (*replace_in_obj)(void *, struct tmem_obj *); -}; -extern void tmem_register_pamops(struct tmem_pamops *m); - -/* memory allocation methods provided by the host implementation */ -struct tmem_hostops { - struct tmem_obj *(*obj_alloc)(struct tmem_pool *); - void (*obj_free)(struct tmem_obj *, struct tmem_pool *); - struct tmem_objnode *(*objnode_alloc)(struct tmem_pool *); - void (*objnode_free)(struct tmem_objnode *, struct tmem_pool *); -}; -extern void tmem_register_hostops(struct tmem_hostops *m); - -/* core tmem accessor functions */ -extern int tmem_put(struct tmem_pool *, struct tmem_oid *, uint32_t index, - char *, size_t, bool, int); -extern int tmem_get(struct tmem_pool *, struct tmem_oid *, uint32_t index, - char *, size_t *, bool, int); -extern int tmem_replace(struct tmem_pool *, struct tmem_oid *, uint32_t index, - void *); -extern void *tmem_localify_get_pampd(struct tmem_pool *, struct tmem_oid *, - uint32_t index, struct tmem_obj **, - void **); -extern void tmem_localify_finish(struct tmem_obj *, uint32_t index, - void *, void *, bool); -extern int tmem_flush_page(struct tmem_pool *, struct tmem_oid *, - uint32_t index); -extern int tmem_flush_object(struct tmem_pool *, struct tmem_oid *); -extern int tmem_destroy_pool(struct tmem_pool *); -extern void tmem_new_pool(struct tmem_pool *, uint32_t); -#endif /* _TMEM_H */ diff --git a/drivers/staging/ramster/xvmalloc.c b/drivers/staging/ramster/xvmalloc.c deleted file mode 100644 index 44ceb0b823a9..000000000000 --- a/drivers/staging/ramster/xvmalloc.c +++ /dev/null @@ -1,509 +0,0 @@ -/* - * xvmalloc memory allocator - * - * Copyright (C) 2008, 2009, 2010 Nitin Gupta - * - * This code is released using a dual license strategy: BSD/GPL - * You can choose the licence that better fits your requirements. - * - * Released under the terms of 3-clause BSD License - * Released under the terms of GNU General Public License Version 2.0 - */ - -#ifdef CONFIG_ZRAM_DEBUG -#define DEBUG -#endif - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/bitops.h> -#include <linux/errno.h> -#include <linux/highmem.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/slab.h> - -#include "xvmalloc.h" -#include "xvmalloc_int.h" - -static void stat_inc(u64 *value) -{ - *value = *value + 1; -} - -static void stat_dec(u64 *value) -{ - *value = *value - 1; -} - -static int test_flag(struct block_header *block, enum blockflags flag) -{ - return block->prev & BIT(flag); -} - -static void set_flag(struct block_header *block, enum blockflags flag) -{ - block->prev |= BIT(flag); -} - -static void clear_flag(struct block_header *block, enum blockflags flag) -{ - block->prev &= ~BIT(flag); -} - -/* - * Given <page, offset> pair, provide a dereferencable pointer. - * This is called from xv_malloc/xv_free path, so it - * needs to be fast. - */ -static void *get_ptr_atomic(struct page *page, u16 offset) -{ - unsigned char *base; - - base = kmap_atomic(page); - return base + offset; -} - -static void put_ptr_atomic(void *ptr) -{ - kunmap_atomic(ptr); -} - -static u32 get_blockprev(struct block_header *block) -{ - return block->prev & PREV_MASK; -} - -static void set_blockprev(struct block_header *block, u16 new_offset) -{ - block->prev = new_offset | (block->prev & FLAGS_MASK); -} - -static struct block_header *BLOCK_NEXT(struct block_header *block) -{ - return (struct block_header *) - ((char *)block + block->size + XV_ALIGN); -} - -/* - * Get index of free list containing blocks of maximum size - * which is less than or equal to given size. - */ -static u32 get_index_for_insert(u32 size) -{ - if (unlikely(size > XV_MAX_ALLOC_SIZE)) - size = XV_MAX_ALLOC_SIZE; - size &= ~FL_DELTA_MASK; - return (size - XV_MIN_ALLOC_SIZE) >> FL_DELTA_SHIFT; -} - -/* - * Get index of free list having blocks of size greater than - * or equal to requested size. - */ -static u32 get_index(u32 size) -{ - if (unlikely(size < XV_MIN_ALLOC_SIZE)) - size = XV_MIN_ALLOC_SIZE; - size = ALIGN(size, FL_DELTA); - return (size - XV_MIN_ALLOC_SIZE) >> FL_DELTA_SHIFT; -} - -/** - * find_block - find block of at least given size - * @pool: memory pool to search from - * @size: size of block required - * @page: page containing required block - * @offset: offset within the page where block is located. - * - * Searches two level bitmap to locate block of at least - * the given size. If such a block is found, it provides - * <page, offset> to identify this block and returns index - * in freelist where we found this block. - * Otherwise, returns 0 and <page, offset> params are not touched. - */ -static u32 find_block(struct xv_pool *pool, u32 size, - struct page **page, u32 *offset) -{ - ulong flbitmap, slbitmap; - u32 flindex, slindex, slbitstart; - - /* There are no free blocks in this pool */ - if (!pool->flbitmap) - return 0; - - /* Get freelist index corresponding to this size */ - slindex = get_index(size); - slbitmap = pool->slbitmap[slindex / BITS_PER_LONG]; - slbitstart = slindex % BITS_PER_LONG; - - /* - * If freelist is not empty at this index, we found the - * block - head of this list. This is approximate best-fit match. - */ - if (test_bit(slbitstart, &slbitmap)) { - *page = pool->freelist[slindex].page; - *offset = pool->freelist[slindex].offset; - return slindex; - } - - /* - * No best-fit found. Search a bit further in bitmap for a free block. - * Second level bitmap consists of series of 32-bit chunks. Search - * further in the chunk where we expected a best-fit, starting from - * index location found above. - */ - slbitstart++; - slbitmap >>= slbitstart; - - /* Skip this search if we were already at end of this bitmap chunk */ - if ((slbitstart != BITS_PER_LONG) && slbitmap) { - slindex += __ffs(slbitmap) + 1; - *page = pool->freelist[slindex].page; - *offset = pool->freelist[slindex].offset; - return slindex; - } - - /* Now do a full two-level bitmap search to find next nearest fit */ - flindex = slindex / BITS_PER_LONG; - - flbitmap = (pool->flbitmap) >> (flindex + 1); - if (!flbitmap) - return 0; - - flindex += __ffs(flbitmap) + 1; - slbitmap = pool->slbitmap[flindex]; - slindex = (flindex * BITS_PER_LONG) + __ffs(slbitmap); - *page = pool->freelist[slindex].page; - *offset = pool->freelist[slindex].offset; - - return slindex; -} - -/* - * Insert block at <page, offset> in freelist of given pool. - * freelist used depends on block size. - */ -static void insert_block(struct xv_pool *pool, struct page *page, u32 offset, - struct block_header *block) -{ - u32 flindex, slindex; - struct block_header *nextblock; - - slindex = get_index_for_insert(block->size); - flindex = slindex / BITS_PER_LONG; - - block->link.prev_page = NULL; - block->link.prev_offset = 0; - block->link.next_page = pool->freelist[slindex].page; - block->link.next_offset = pool->freelist[slindex].offset; - pool->freelist[slindex].page = page; - pool->freelist[slindex].offset = offset; - - if (block->link.next_page) { - nextblock = get_ptr_atomic(block->link.next_page, - block->link.next_offset); - nextblock->link.prev_page = page; - nextblock->link.prev_offset = offset; - put_ptr_atomic(nextblock); - /* If there was a next page then the free bits are set. */ - return; - } - - __set_bit(slindex % BITS_PER_LONG, &pool->slbitmap[flindex]); - __set_bit(flindex, &pool->flbitmap); -} - -/* - * Remove block from freelist. Index 'slindex' identifies the freelist. - */ -static void remove_block(struct xv_pool *pool, struct page *page, u32 offset, - struct block_header *block, u32 slindex) -{ - u32 flindex = slindex / BITS_PER_LONG; - struct block_header *tmpblock; - - if (block->link.prev_page) { - tmpblock = get_ptr_atomic(block->link.prev_page, - block->link.prev_offset); - tmpblock->link.next_page = block->link.next_page; - tmpblock->link.next_offset = block->link.next_offset; - put_ptr_atomic(tmpblock); - } - - if (block->link.next_page) { - tmpblock = get_ptr_atomic(block->link.next_page, - block->link.next_offset); - tmpblock->link.prev_page = block->link.prev_page; - tmpblock->link.prev_offset = block->link.prev_offset; - put_ptr_atomic(tmpblock); - } - - /* Is this block is at the head of the freelist? */ - if (pool->freelist[slindex].page == page - && pool->freelist[slindex].offset == offset) { - - pool->freelist[slindex].page = block->link.next_page; - pool->freelist[slindex].offset = block->link.next_offset; - - if (pool->freelist[slindex].page) { - struct block_header *tmpblock; - tmpblock = get_ptr_atomic(pool->freelist[slindex].page, - pool->freelist[slindex].offset); - tmpblock->link.prev_page = NULL; - tmpblock->link.prev_offset = 0; - put_ptr_atomic(tmpblock); - } else { - /* This freelist bucket is empty */ - __clear_bit(slindex % BITS_PER_LONG, - &pool->slbitmap[flindex]); - if (!pool->slbitmap[flindex]) - __clear_bit(flindex, &pool->flbitmap); - } - } - - block->link.prev_page = NULL; - block->link.prev_offset = 0; - block->link.next_page = NULL; - block->link.next_offset = 0; -} - -/* - * Allocate a page and add it to freelist of given pool. - */ -static int grow_pool(struct xv_pool *pool, gfp_t flags) -{ - struct page *page; - struct block_header *block; - - page = alloc_page(flags); - if (unlikely(!page)) - return -ENOMEM; - - stat_inc(&pool->total_pages); - - spin_lock(&pool->lock); - block = get_ptr_atomic(page, 0); - - block->size = PAGE_SIZE - XV_ALIGN; - set_flag(block, BLOCK_FREE); - clear_flag(block, PREV_FREE); - set_blockprev(block, 0); - - insert_block(pool, page, 0, block); - - put_ptr_atomic(block); - spin_unlock(&pool->lock); - - return 0; -} - -/* - * Create a memory pool. Allocates freelist, bitmaps and other - * per-pool metadata. - */ -struct xv_pool *xv_create_pool(void) -{ - u32 ovhd_size; - struct xv_pool *pool; - - ovhd_size = roundup(sizeof(*pool), PAGE_SIZE); - pool = kzalloc(ovhd_size, GFP_KERNEL); - if (!pool) - return NULL; - - spin_lock_init(&pool->lock); - - return pool; -} -EXPORT_SYMBOL_GPL(xv_create_pool); - -void xv_destroy_pool(struct xv_pool *pool) -{ - kfree(pool); -} -EXPORT_SYMBOL_GPL(xv_destroy_pool); - -/** - * xv_malloc - Allocate block of given size from pool. - * @pool: pool to allocate from - * @size: size of block to allocate - * @page: page no. that holds the object - * @offset: location of object within page - * - * On success, <page, offset> identifies block allocated - * and 0 is returned. On failure, <page, offset> is set to - * 0 and -ENOMEM is returned. - * - * Allocation requests with size > XV_MAX_ALLOC_SIZE will fail. - */ -int xv_malloc(struct xv_pool *pool, u32 size, struct page **page, - u32 *offset, gfp_t flags) -{ - int error; - u32 index, tmpsize, origsize, tmpoffset; - struct block_header *block, *tmpblock; - - *page = NULL; - *offset = 0; - origsize = size; - - if (unlikely(!size || size > XV_MAX_ALLOC_SIZE)) - return -ENOMEM; - - size = ALIGN(size, XV_ALIGN); - - spin_lock(&pool->lock); - - index = find_block(pool, size, page, offset); - - if (!*page) { - spin_unlock(&pool->lock); - if (flags & GFP_NOWAIT) - return -ENOMEM; - error = grow_pool(pool, flags); - if (unlikely(error)) - return error; - - spin_lock(&pool->lock); - index = find_block(pool, size, page, offset); - } - - if (!*page) { - spin_unlock(&pool->lock); - return -ENOMEM; - } - - block = get_ptr_atomic(*page, *offset); - - remove_block(pool, *page, *offset, block, index); - - /* Split the block if required */ - tmpoffset = *offset + size + XV_ALIGN; - tmpsize = block->size - size; - tmpblock = (struct block_header *)((char *)block + size + XV_ALIGN); - if (tmpsize) { - tmpblock->size = tmpsize - XV_ALIGN; - set_flag(tmpblock, BLOCK_FREE); - clear_flag(tmpblock, PREV_FREE); - - set_blockprev(tmpblock, *offset); - if (tmpblock->size >= XV_MIN_ALLOC_SIZE) - insert_block(pool, *page, tmpoffset, tmpblock); - - if (tmpoffset + XV_ALIGN + tmpblock->size != PAGE_SIZE) { - tmpblock = BLOCK_NEXT(tmpblock); - set_blockprev(tmpblock, tmpoffset); - } - } else { - /* This block is exact fit */ - if (tmpoffset != PAGE_SIZE) - clear_flag(tmpblock, PREV_FREE); - } - - block->size = origsize; - clear_flag(block, BLOCK_FREE); - - put_ptr_atomic(block); - spin_unlock(&pool->lock); - - *offset += XV_ALIGN; - - return 0; -} -EXPORT_SYMBOL_GPL(xv_malloc); - -/* - * Free block identified with <page, offset> - */ -void xv_free(struct xv_pool *pool, struct page *page, u32 offset) -{ - void *page_start; - struct block_header *block, *tmpblock; - - offset -= XV_ALIGN; - - spin_lock(&pool->lock); - - page_start = get_ptr_atomic(page, 0); - block = (struct block_header *)((char *)page_start + offset); - - /* Catch double free bugs */ - BUG_ON(test_flag(block, BLOCK_FREE)); - - block->size = ALIGN(block->size, XV_ALIGN); - - tmpblock = BLOCK_NEXT(block); - if (offset + block->size + XV_ALIGN == PAGE_SIZE) - tmpblock = NULL; - - /* Merge next block if its free */ - if (tmpblock && test_flag(tmpblock, BLOCK_FREE)) { - /* - * Blocks smaller than XV_MIN_ALLOC_SIZE - * are not inserted in any free list. - */ - if (tmpblock->size >= XV_MIN_ALLOC_SIZE) { - remove_block(pool, page, - offset + block->size + XV_ALIGN, tmpblock, - get_index_for_insert(tmpblock->size)); - } - block->size += tmpblock->size + XV_ALIGN; - } - - /* Merge previous block if its free */ - if (test_flag(block, PREV_FREE)) { - tmpblock = (struct block_header *)((char *)(page_start) + - get_blockprev(block)); - offset = offset - tmpblock->size - XV_ALIGN; - - if (tmpblock->size >= XV_MIN_ALLOC_SIZE) - remove_block(pool, page, offset, tmpblock, - get_index_for_insert(tmpblock->size)); - - tmpblock->size += block->size + XV_ALIGN; - block = tmpblock; - } - - /* No used objects in this page. Free it. */ - if (block->size == PAGE_SIZE - XV_ALIGN) { - put_ptr_atomic(page_start); - spin_unlock(&pool->lock); - - __free_page(page); - stat_dec(&pool->total_pages); - return; - } - - set_flag(block, BLOCK_FREE); - if (block->size >= XV_MIN_ALLOC_SIZE) - insert_block(pool, page, offset, block); - - if (offset + block->size + XV_ALIGN != PAGE_SIZE) { - tmpblock = BLOCK_NEXT(block); - set_flag(tmpblock, PREV_FREE); - set_blockprev(tmpblock, offset); - } - - put_ptr_atomic(page_start); - spin_unlock(&pool->lock); -} -EXPORT_SYMBOL_GPL(xv_free); - -u32 xv_get_object_size(void *obj) -{ - struct block_header *blk; - - blk = (struct block_header *)((char *)(obj) - XV_ALIGN); - return blk->size; -} -EXPORT_SYMBOL_GPL(xv_get_object_size); - -/* - * Returns total memory used by allocator (userdata + metadata) - */ -u64 xv_get_total_size_bytes(struct xv_pool *pool) -{ - return pool->total_pages << PAGE_SHIFT; -} -EXPORT_SYMBOL_GPL(xv_get_total_size_bytes); diff --git a/drivers/staging/ramster/xvmalloc.h b/drivers/staging/ramster/xvmalloc.h deleted file mode 100644 index 5b1a81aa5faf..000000000000 --- a/drivers/staging/ramster/xvmalloc.h +++ /dev/null @@ -1,30 +0,0 @@ -/* - * xvmalloc memory allocator - * - * Copyright (C) 2008, 2009, 2010 Nitin Gupta - * - * This code is released using a dual license strategy: BSD/GPL - * You can choose the licence that better fits your requirements. - * - * Released under the terms of 3-clause BSD License - * Released under the terms of GNU General Public License Version 2.0 - */ - -#ifndef _XV_MALLOC_H_ -#define _XV_MALLOC_H_ - -#include <linux/types.h> - -struct xv_pool; - -struct xv_pool *xv_create_pool(void); -void xv_destroy_pool(struct xv_pool *pool); - -int xv_malloc(struct xv_pool *pool, u32 size, struct page **page, - u32 *offset, gfp_t flags); -void xv_free(struct xv_pool *pool, struct page *page, u32 offset); - -u32 xv_get_object_size(void *obj); -u64 xv_get_total_size_bytes(struct xv_pool *pool); - -#endif diff --git a/drivers/staging/ramster/xvmalloc_int.h b/drivers/staging/ramster/xvmalloc_int.h deleted file mode 100644 index b5f1f7febcf6..000000000000 --- a/drivers/staging/ramster/xvmalloc_int.h +++ /dev/null @@ -1,95 +0,0 @@ -/* - * xvmalloc memory allocator - * - * Copyright (C) 2008, 2009, 2010 Nitin Gupta - * - * This code is released using a dual license strategy: BSD/GPL - * You can choose the licence that better fits your requirements. - * - * Released under the terms of 3-clause BSD License - * Released under the terms of GNU General Public License Version 2.0 - */ - -#ifndef _XV_MALLOC_INT_H_ -#define _XV_MALLOC_INT_H_ - -#include <linux/kernel.h> -#include <linux/types.h> - -/* User configurable params */ - -/* Must be power of two */ -#ifdef CONFIG_64BIT -#define XV_ALIGN_SHIFT 3 -#else -#define XV_ALIGN_SHIFT 2 -#endif -#define XV_ALIGN (1 << XV_ALIGN_SHIFT) -#define XV_ALIGN_MASK (XV_ALIGN - 1) - -/* This must be greater than sizeof(link_free) */ -#define XV_MIN_ALLOC_SIZE 32 -#define XV_MAX_ALLOC_SIZE (PAGE_SIZE - XV_ALIGN) - -/* - * Free lists are separated by FL_DELTA bytes - * This value is 3 for 4k pages and 4 for 64k pages, for any - * other page size, a conservative (PAGE_SHIFT - 9) is used. - */ -#if PAGE_SHIFT == 16 -#define FL_DELTA_SHIFT 4 -#else -#define FL_DELTA_SHIFT (PAGE_SHIFT - 9) -#endif -#define FL_DELTA (1 << FL_DELTA_SHIFT) -#define FL_DELTA_MASK (FL_DELTA - 1) -#define NUM_FREE_LISTS ((XV_MAX_ALLOC_SIZE - XV_MIN_ALLOC_SIZE) \ - / FL_DELTA + 1) - -#define MAX_FLI DIV_ROUND_UP(NUM_FREE_LISTS, BITS_PER_LONG) - -/* End of user params */ - -enum blockflags { - BLOCK_FREE, - PREV_FREE, - __NR_BLOCKFLAGS, -}; - -#define FLAGS_MASK XV_ALIGN_MASK -#define PREV_MASK (~FLAGS_MASK) - -struct freelist_entry { - struct page *page; - u16 offset; - u16 pad; -}; - -struct link_free { - struct page *prev_page; - struct page *next_page; - u16 prev_offset; - u16 next_offset; -}; - -struct block_header { - union { - /* This common header must be XV_ALIGN bytes */ - u8 common[XV_ALIGN]; - struct { - u16 size; - u16 prev; - }; - }; - struct link_free link; -}; - -struct xv_pool { - ulong flbitmap; - ulong slbitmap[MAX_FLI]; - u64 total_pages; /* stats */ - struct freelist_entry freelist[NUM_FREE_LISTS]; - spinlock_t lock; -}; - -#endif diff --git a/drivers/staging/ramster/zcache-main.c b/drivers/staging/ramster/zcache-main.c deleted file mode 100644 index d46764b5aaba..000000000000 --- a/drivers/staging/ramster/zcache-main.c +++ /dev/null @@ -1,3320 +0,0 @@ -/* - * zcache.c - * - * Copyright (c) 2010-2012, Dan Magenheimer, Oracle Corp. - * Copyright (c) 2010,2011, Nitin Gupta - * - * Zcache provides an in-kernel "host implementation" for transcendent memory - * and, thus indirectly, for cleancache and frontswap. Zcache includes two - * page-accessible memory [1] interfaces, both utilizing lzo1x compression: - * 1) "compression buddies" ("zbud") is used for ephemeral pages - * 2) xvmalloc is used for persistent pages. - * Xvmalloc (based on the TLSF allocator) has very low fragmentation - * so maximizes space efficiency, while zbud allows pairs (and potentially, - * in the future, more than a pair of) compressed pages to be closely linked - * so that reclaiming can be done via the kernel's physical-page-oriented - * "shrinker" interface. - * - * [1] For a definition of page-accessible memory (aka PAM), see: - * http://marc.info/?l=linux-mm&m=127811271605009 - * RAMSTER TODO: - * - handle remotifying of buddied pages (see zbud_remotify_zbpg) - * - kernel boot params: nocleancache/nofrontswap don't always work?!? - */ - -#include <linux/module.h> -#include <linux/cpu.h> -#include <linux/highmem.h> -#include <linux/list.h> -#include <linux/lzo.h> -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/types.h> -#include <linux/atomic.h> -#include <linux/math64.h> -#include "tmem.h" -#include "zcache.h" -#include "ramster.h" -#include "cluster/tcp.h" - -#include "xvmalloc.h" /* temporary until change to zsmalloc */ - -#define RAMSTER_TESTING - -#if (!defined(CONFIG_CLEANCACHE) && !defined(CONFIG_FRONTSWAP)) -#error "ramster is useless without CONFIG_CLEANCACHE or CONFIG_FRONTSWAP" -#endif -#ifdef CONFIG_CLEANCACHE -#include <linux/cleancache.h> -#endif -#ifdef CONFIG_FRONTSWAP -#include <linux/frontswap.h> -#endif - -enum ramster_remotify_op { - RAMSTER_REMOTIFY_EPH_PUT, - RAMSTER_REMOTIFY_PERS_PUT, - RAMSTER_REMOTIFY_FLUSH_PAGE, - RAMSTER_REMOTIFY_FLUSH_OBJ, - RAMSTER_INTRANSIT_PERS -}; - -struct ramster_remotify_hdr { - enum ramster_remotify_op op; - struct list_head list; -}; - -#define ZBH_SENTINEL 0x43214321 -#define ZBPG_SENTINEL 0xdeadbeef - -#define ZBUD_MAX_BUDS 2 - -struct zbud_hdr { - struct ramster_remotify_hdr rem_op; - uint16_t client_id; - uint16_t pool_id; - struct tmem_oid oid; - uint32_t index; - uint16_t size; /* compressed size in bytes, zero means unused */ - DECL_SENTINEL -}; - -#define ZVH_SENTINEL 0x43214321 -static const int zv_max_page_size = (PAGE_SIZE / 8) * 7; - -struct zv_hdr { - struct ramster_remotify_hdr rem_op; - uint16_t client_id; - uint16_t pool_id; - struct tmem_oid oid; - uint32_t index; - DECL_SENTINEL -}; - -struct flushlist_node { - struct ramster_remotify_hdr rem_op; - struct tmem_xhandle xh; -}; - -union { - struct ramster_remotify_hdr rem_op; - struct zv_hdr zv; - struct zbud_hdr zbud; - struct flushlist_node flist; -} remotify_list_node; - -static LIST_HEAD(zcache_rem_op_list); -static DEFINE_SPINLOCK(zcache_rem_op_list_lock); - -#if 0 -/* this is more aggressive but may cause other problems? */ -#define ZCACHE_GFP_MASK (GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN) -#else -#define ZCACHE_GFP_MASK \ - (__GFP_FS | __GFP_NORETRY | __GFP_NOWARN | __GFP_NOMEMALLOC) -#endif - -#define MAX_POOLS_PER_CLIENT 16 - -#define MAX_CLIENTS 16 -#define LOCAL_CLIENT ((uint16_t)-1) - -MODULE_LICENSE("GPL"); - -struct zcache_client { - struct tmem_pool *tmem_pools[MAX_POOLS_PER_CLIENT]; - struct xv_pool *xvpool; - bool allocated; - atomic_t refcount; -}; - -static struct zcache_client zcache_host; -static struct zcache_client zcache_clients[MAX_CLIENTS]; - -static inline uint16_t get_client_id_from_client(struct zcache_client *cli) -{ - BUG_ON(cli == NULL); - if (cli == &zcache_host) - return LOCAL_CLIENT; - return cli - &zcache_clients[0]; -} - -static inline bool is_local_client(struct zcache_client *cli) -{ - return cli == &zcache_host; -} - -/********** - * Compression buddies ("zbud") provides for packing two (or, possibly - * in the future, more) compressed ephemeral pages into a single "raw" - * (physical) page and tracking them with data structures so that - * the raw pages can be easily reclaimed. - * - * A zbud page ("zbpg") is an aligned page containing a list_head, - * a lock, and two "zbud headers". The remainder of the physical - * page is divided up into aligned 64-byte "chunks" which contain - * the compressed data for zero, one, or two zbuds. Each zbpg - * resides on: (1) an "unused list" if it has no zbuds; (2) a - * "buddied" list if it is fully populated with two zbuds; or - * (3) one of PAGE_SIZE/64 "unbuddied" lists indexed by how many chunks - * the one unbuddied zbud uses. The data inside a zbpg cannot be - * read or written unless the zbpg's lock is held. - */ - -struct zbud_page { - struct list_head bud_list; - spinlock_t lock; - struct zbud_hdr buddy[ZBUD_MAX_BUDS]; - DECL_SENTINEL - /* followed by NUM_CHUNK aligned CHUNK_SIZE-byte chunks */ -}; - -#define CHUNK_SHIFT 6 -#define CHUNK_SIZE (1 << CHUNK_SHIFT) -#define CHUNK_MASK (~(CHUNK_SIZE-1)) -#define NCHUNKS (((PAGE_SIZE - sizeof(struct zbud_page)) & \ - CHUNK_MASK) >> CHUNK_SHIFT) -#define MAX_CHUNK (NCHUNKS-1) - -static struct { - struct list_head list; - unsigned count; -} zbud_unbuddied[NCHUNKS]; -/* list N contains pages with N chunks USED and NCHUNKS-N unused */ -/* element 0 is never used but optimizing that isn't worth it */ -static unsigned long zbud_cumul_chunk_counts[NCHUNKS]; - -struct list_head zbud_buddied_list; -static unsigned long zcache_zbud_buddied_count; - -/* protects the buddied list and all unbuddied lists */ -static DEFINE_SPINLOCK(zbud_budlists_spinlock); - -static atomic_t zcache_zbud_curr_raw_pages; -static atomic_t zcache_zbud_curr_zpages; -static unsigned long zcache_zbud_curr_zbytes; -static unsigned long zcache_zbud_cumul_zpages; -static unsigned long zcache_zbud_cumul_zbytes; -static unsigned long zcache_compress_poor; -static unsigned long zcache_policy_percent_exceeded; -static unsigned long zcache_mean_compress_poor; - -/* - * RAMster counters - * - Remote pages are pages with a local pampd but the data is remote - * - Foreign pages are pages stored locally but belonging to another node - */ -static atomic_t ramster_remote_pers_pages = ATOMIC_INIT(0); -static unsigned long ramster_pers_remotify_enable; -static unsigned long ramster_eph_remotify_enable; -static unsigned long ramster_eph_pages_remoted; -static unsigned long ramster_eph_pages_remote_failed; -static unsigned long ramster_pers_pages_remoted; -static unsigned long ramster_pers_pages_remote_failed; -static unsigned long ramster_pers_pages_remote_nomem; -static unsigned long ramster_remote_objects_flushed; -static unsigned long ramster_remote_object_flushes_failed; -static unsigned long ramster_remote_pages_flushed; -static unsigned long ramster_remote_page_flushes_failed; -static unsigned long ramster_remote_eph_pages_succ_get; -static unsigned long ramster_remote_pers_pages_succ_get; -static unsigned long ramster_remote_eph_pages_unsucc_get; -static unsigned long ramster_remote_pers_pages_unsucc_get; -static atomic_t ramster_curr_flnode_count = ATOMIC_INIT(0); -static unsigned long ramster_curr_flnode_count_max; -static atomic_t ramster_foreign_eph_pampd_count = ATOMIC_INIT(0); -static unsigned long ramster_foreign_eph_pampd_count_max; -static atomic_t ramster_foreign_pers_pampd_count = ATOMIC_INIT(0); -static unsigned long ramster_foreign_pers_pampd_count_max; - -/* forward references */ -static void *zcache_get_free_page(void); -static void zcache_free_page(void *p); - -/* - * zbud helper functions - */ - -static inline unsigned zbud_max_buddy_size(void) -{ - return MAX_CHUNK << CHUNK_SHIFT; -} - -static inline unsigned zbud_size_to_chunks(unsigned size) -{ - BUG_ON(size == 0 || size > zbud_max_buddy_size()); - return (size + CHUNK_SIZE - 1) >> CHUNK_SHIFT; -} - -static inline int zbud_budnum(struct zbud_hdr *zh) -{ - unsigned offset = (unsigned long)zh & (PAGE_SIZE - 1); - struct zbud_page *zbpg = NULL; - unsigned budnum = -1U; - int i; - - for (i = 0; i < ZBUD_MAX_BUDS; i++) - if (offset == offsetof(typeof(*zbpg), buddy[i])) { - budnum = i; - break; - } - BUG_ON(budnum == -1U); - return budnum; -} - -static char *zbud_data(struct zbud_hdr *zh, unsigned size) -{ - struct zbud_page *zbpg; - char *p; - unsigned budnum; - - ASSERT_SENTINEL(zh, ZBH); - budnum = zbud_budnum(zh); - BUG_ON(size == 0 || size > zbud_max_buddy_size()); - zbpg = container_of(zh, struct zbud_page, buddy[budnum]); - ASSERT_SPINLOCK(&zbpg->lock); - p = (char *)zbpg; - if (budnum == 0) - p += ((sizeof(struct zbud_page) + CHUNK_SIZE - 1) & - CHUNK_MASK); - else if (budnum == 1) - p += PAGE_SIZE - ((size + CHUNK_SIZE - 1) & CHUNK_MASK); - return p; -} - -static void zbud_copy_from_pampd(char *data, size_t *size, struct zbud_hdr *zh) -{ - struct zbud_page *zbpg; - char *p; - unsigned budnum; - - ASSERT_SENTINEL(zh, ZBH); - budnum = zbud_budnum(zh); - zbpg = container_of(zh, struct zbud_page, buddy[budnum]); - spin_lock(&zbpg->lock); - BUG_ON(zh->size > *size); - p = (char *)zbpg; - if (budnum == 0) - p += ((sizeof(struct zbud_page) + CHUNK_SIZE - 1) & - CHUNK_MASK); - else if (budnum == 1) - p += PAGE_SIZE - ((zh->size + CHUNK_SIZE - 1) & CHUNK_MASK); - /* client should be filled in by caller */ - memcpy(data, p, zh->size); - *size = zh->size; - spin_unlock(&zbpg->lock); -} - -/* - * zbud raw page management - */ - -static struct zbud_page *zbud_alloc_raw_page(void) -{ - struct zbud_page *zbpg = NULL; - struct zbud_hdr *zh0, *zh1; - zbpg = zcache_get_free_page(); - if (likely(zbpg != NULL)) { - INIT_LIST_HEAD(&zbpg->bud_list); - zh0 = &zbpg->buddy[0]; zh1 = &zbpg->buddy[1]; - spin_lock_init(&zbpg->lock); - atomic_inc(&zcache_zbud_curr_raw_pages); - INIT_LIST_HEAD(&zbpg->bud_list); - SET_SENTINEL(zbpg, ZBPG); - zh0->size = 0; zh1->size = 0; - tmem_oid_set_invalid(&zh0->oid); - tmem_oid_set_invalid(&zh1->oid); - } - return zbpg; -} - -static void zbud_free_raw_page(struct zbud_page *zbpg) -{ - struct zbud_hdr *zh0 = &zbpg->buddy[0], *zh1 = &zbpg->buddy[1]; - - ASSERT_SENTINEL(zbpg, ZBPG); - BUG_ON(!list_empty(&zbpg->bud_list)); - ASSERT_SPINLOCK(&zbpg->lock); - BUG_ON(zh0->size != 0 || tmem_oid_valid(&zh0->oid)); - BUG_ON(zh1->size != 0 || tmem_oid_valid(&zh1->oid)); - INVERT_SENTINEL(zbpg, ZBPG); - spin_unlock(&zbpg->lock); - atomic_dec(&zcache_zbud_curr_raw_pages); - zcache_free_page(zbpg); -} - -/* - * core zbud handling routines - */ - -static unsigned zbud_free(struct zbud_hdr *zh) -{ - unsigned size; - - ASSERT_SENTINEL(zh, ZBH); - BUG_ON(!tmem_oid_valid(&zh->oid)); - size = zh->size; - BUG_ON(zh->size == 0 || zh->size > zbud_max_buddy_size()); - zh->size = 0; - tmem_oid_set_invalid(&zh->oid); - INVERT_SENTINEL(zh, ZBH); - zcache_zbud_curr_zbytes -= size; - atomic_dec(&zcache_zbud_curr_zpages); - return size; -} - -static void zbud_free_and_delist(struct zbud_hdr *zh) -{ - unsigned chunks; - struct zbud_hdr *zh_other; - unsigned budnum = zbud_budnum(zh), size; - struct zbud_page *zbpg = - container_of(zh, struct zbud_page, buddy[budnum]); - - /* FIXME, should be BUG_ON, pool destruction path doesn't disable - * interrupts tmem_destroy_pool()->tmem_pampd_destroy_all_in_obj()-> - * tmem_objnode_node_destroy()-> zcache_pampd_free() */ - WARN_ON(!irqs_disabled()); - spin_lock(&zbpg->lock); - if (list_empty(&zbpg->bud_list)) { - /* ignore zombie page... see zbud_evict_pages() */ - spin_unlock(&zbpg->lock); - return; - } - size = zbud_free(zh); - ASSERT_SPINLOCK(&zbpg->lock); - zh_other = &zbpg->buddy[(budnum == 0) ? 1 : 0]; - if (zh_other->size == 0) { /* was unbuddied: unlist and free */ - chunks = zbud_size_to_chunks(size) ; - spin_lock(&zbud_budlists_spinlock); - BUG_ON(list_empty(&zbud_unbuddied[chunks].list)); - list_del_init(&zbpg->bud_list); - zbud_unbuddied[chunks].count--; - spin_unlock(&zbud_budlists_spinlock); - zbud_free_raw_page(zbpg); - } else { /* was buddied: move remaining buddy to unbuddied list */ - chunks = zbud_size_to_chunks(zh_other->size) ; - spin_lock(&zbud_budlists_spinlock); - list_del_init(&zbpg->bud_list); - zcache_zbud_buddied_count--; - list_add_tail(&zbpg->bud_list, &zbud_unbuddied[chunks].list); - zbud_unbuddied[chunks].count++; - spin_unlock(&zbud_budlists_spinlock); - spin_unlock(&zbpg->lock); - } -} - -static struct zbud_hdr *zbud_create(uint16_t client_id, uint16_t pool_id, - struct tmem_oid *oid, - uint32_t index, struct page *page, - void *cdata, unsigned size) -{ - struct zbud_hdr *zh0, *zh1, *zh = NULL; - struct zbud_page *zbpg = NULL, *ztmp; - unsigned nchunks; - char *to; - int i, found_good_buddy = 0; - - nchunks = zbud_size_to_chunks(size) ; - for (i = MAX_CHUNK - nchunks + 1; i > 0; i--) { - spin_lock(&zbud_budlists_spinlock); - if (!list_empty(&zbud_unbuddied[i].list)) { - list_for_each_entry_safe(zbpg, ztmp, - &zbud_unbuddied[i].list, bud_list) { - if (spin_trylock(&zbpg->lock)) { - found_good_buddy = i; - goto found_unbuddied; - } - } - } - spin_unlock(&zbud_budlists_spinlock); - } - /* didn't find a good buddy, try allocating a new page */ - zbpg = zbud_alloc_raw_page(); - if (unlikely(zbpg == NULL)) - goto out; - /* ok, have a page, now compress the data before taking locks */ - spin_lock(&zbud_budlists_spinlock); - spin_lock(&zbpg->lock); - list_add_tail(&zbpg->bud_list, &zbud_unbuddied[nchunks].list); - zbud_unbuddied[nchunks].count++; - zh = &zbpg->buddy[0]; - goto init_zh; - -found_unbuddied: - ASSERT_SPINLOCK(&zbpg->lock); - zh0 = &zbpg->buddy[0]; zh1 = &zbpg->buddy[1]; - BUG_ON(!((zh0->size == 0) ^ (zh1->size == 0))); - if (zh0->size != 0) { /* buddy0 in use, buddy1 is vacant */ - ASSERT_SENTINEL(zh0, ZBH); - zh = zh1; - } else if (zh1->size != 0) { /* buddy1 in use, buddy0 is vacant */ - ASSERT_SENTINEL(zh1, ZBH); - zh = zh0; - } else - BUG(); - list_del_init(&zbpg->bud_list); - zbud_unbuddied[found_good_buddy].count--; - list_add_tail(&zbpg->bud_list, &zbud_buddied_list); - zcache_zbud_buddied_count++; - -init_zh: - SET_SENTINEL(zh, ZBH); - zh->size = size; - zh->index = index; - zh->oid = *oid; - zh->pool_id = pool_id; - zh->client_id = client_id; - to = zbud_data(zh, size); - memcpy(to, cdata, size); - spin_unlock(&zbpg->lock); - spin_unlock(&zbud_budlists_spinlock); - zbud_cumul_chunk_counts[nchunks]++; - atomic_inc(&zcache_zbud_curr_zpages); - zcache_zbud_cumul_zpages++; - zcache_zbud_curr_zbytes += size; - zcache_zbud_cumul_zbytes += size; -out: - return zh; -} - -static int zbud_decompress(struct page *page, struct zbud_hdr *zh) -{ - struct zbud_page *zbpg; - unsigned budnum = zbud_budnum(zh); - size_t out_len = PAGE_SIZE; - char *to_va, *from_va; - unsigned size; - int ret = 0; - - zbpg = container_of(zh, struct zbud_page, buddy[budnum]); - spin_lock(&zbpg->lock); - if (list_empty(&zbpg->bud_list)) { - /* ignore zombie page... see zbud_evict_pages() */ - ret = -EINVAL; - goto out; - } - ASSERT_SENTINEL(zh, ZBH); - BUG_ON(zh->size == 0 || zh->size > zbud_max_buddy_size()); - to_va = kmap_atomic(page); - size = zh->size; - from_va = zbud_data(zh, size); - ret = lzo1x_decompress_safe(from_va, size, to_va, &out_len); - BUG_ON(ret != LZO_E_OK); - BUG_ON(out_len != PAGE_SIZE); - kunmap_atomic(to_va); -out: - spin_unlock(&zbpg->lock); - return ret; -} - -/* - * The following routines handle shrinking of ephemeral pages by evicting - * pages "least valuable" first. - */ - -static unsigned long zcache_evicted_raw_pages; -static unsigned long zcache_evicted_buddied_pages; -static unsigned long zcache_evicted_unbuddied_pages; - -static struct tmem_pool *zcache_get_pool_by_id(uint16_t cli_id, - uint16_t poolid); -static void zcache_put_pool(struct tmem_pool *pool); - -/* - * Flush and free all zbuds in a zbpg, then free the pageframe - */ -static void zbud_evict_zbpg(struct zbud_page *zbpg) -{ - struct zbud_hdr *zh; - int i, j; - uint32_t pool_id[ZBUD_MAX_BUDS], client_id[ZBUD_MAX_BUDS]; - uint32_t index[ZBUD_MAX_BUDS]; - struct tmem_oid oid[ZBUD_MAX_BUDS]; - struct tmem_pool *pool; - unsigned long flags; - - ASSERT_SPINLOCK(&zbpg->lock); - for (i = 0, j = 0; i < ZBUD_MAX_BUDS; i++) { - zh = &zbpg->buddy[i]; - if (zh->size) { - client_id[j] = zh->client_id; - pool_id[j] = zh->pool_id; - oid[j] = zh->oid; - index[j] = zh->index; - j++; - } - } - spin_unlock(&zbpg->lock); - for (i = 0; i < j; i++) { - pool = zcache_get_pool_by_id(client_id[i], pool_id[i]); - BUG_ON(pool == NULL); - local_irq_save(flags); - /* these flushes should dispose of any local storage */ - tmem_flush_page(pool, &oid[i], index[i]); - local_irq_restore(flags); - zcache_put_pool(pool); - } -} - -/* - * Free nr pages. This code is funky because we want to hold the locks - * protecting various lists for as short a time as possible, and in some - * circumstances the list may change asynchronously when the list lock is - * not held. In some cases we also trylock not only to avoid waiting on a - * page in use by another cpu, but also to avoid potential deadlock due to - * lock inversion. - */ -static void zbud_evict_pages(int nr) -{ - struct zbud_page *zbpg; - int i, newly_unused_pages = 0; - - - /* now try freeing unbuddied pages, starting with least space avail */ - for (i = 0; i < MAX_CHUNK; i++) { -retry_unbud_list_i: - spin_lock_bh(&zbud_budlists_spinlock); - if (list_empty(&zbud_unbuddied[i].list)) { - spin_unlock_bh(&zbud_budlists_spinlock); - continue; - } - list_for_each_entry(zbpg, &zbud_unbuddied[i].list, bud_list) { - if (unlikely(!spin_trylock(&zbpg->lock))) - continue; - zbud_unbuddied[i].count--; - spin_unlock(&zbud_budlists_spinlock); - zcache_evicted_unbuddied_pages++; - /* want budlists unlocked when doing zbpg eviction */ - zbud_evict_zbpg(zbpg); - newly_unused_pages++; - local_bh_enable(); - if (--nr <= 0) - goto evict_unused; - goto retry_unbud_list_i; - } - spin_unlock_bh(&zbud_budlists_spinlock); - } - - /* as a last resort, free buddied pages */ -retry_bud_list: - spin_lock_bh(&zbud_budlists_spinlock); - if (list_empty(&zbud_buddied_list)) { - spin_unlock_bh(&zbud_budlists_spinlock); - goto evict_unused; - } - list_for_each_entry(zbpg, &zbud_buddied_list, bud_list) { - if (unlikely(!spin_trylock(&zbpg->lock))) - continue; - zcache_zbud_buddied_count--; - spin_unlock(&zbud_budlists_spinlock); - zcache_evicted_buddied_pages++; - /* want budlists unlocked when doing zbpg eviction */ - zbud_evict_zbpg(zbpg); - newly_unused_pages++; - local_bh_enable(); - if (--nr <= 0) - goto evict_unused; - goto retry_bud_list; - } - spin_unlock_bh(&zbud_budlists_spinlock); - -evict_unused: - return; -} - -static DEFINE_PER_CPU(unsigned char *, zcache_remoteputmem); - -static int zbud_remotify_zbud(struct tmem_xhandle *xh, char *data, - size_t size) -{ - struct tmem_pool *pool; - int i, remotenode, ret = -1; - unsigned char cksum, *p; - unsigned long flags; - - for (p = data, cksum = 0, i = 0; i < size; i++) - cksum += *p; - ret = ramster_remote_put(xh, data, size, true, &remotenode); - if (ret == 0) { - /* data was successfully remoted so change the local version - * to point to the remote node where it landed */ - pool = zcache_get_pool_by_id(LOCAL_CLIENT, xh->pool_id); - BUG_ON(pool == NULL); - local_irq_save(flags); - /* tmem_replace will also free up any local space */ - (void)tmem_replace(pool, &xh->oid, xh->index, - pampd_make_remote(remotenode, size, cksum)); - local_irq_restore(flags); - zcache_put_pool(pool); - ramster_eph_pages_remoted++; - ret = 0; - } else - ramster_eph_pages_remote_failed++; - return ret; -} - -static int zbud_remotify_zbpg(struct zbud_page *zbpg) -{ - struct zbud_hdr *zh1, *zh2 = NULL; - struct tmem_xhandle xh1, xh2 = { 0 }; - char *data1 = NULL, *data2 = NULL; - size_t size1 = 0, size2 = 0; - int ret = 0; - unsigned char *tmpmem = __get_cpu_var(zcache_remoteputmem); - - ASSERT_SPINLOCK(&zbpg->lock); - if (zbpg->buddy[0].size == 0) - zh1 = &zbpg->buddy[1]; - else if (zbpg->buddy[1].size == 0) - zh1 = &zbpg->buddy[0]; - else { - zh1 = &zbpg->buddy[0]; - zh2 = &zbpg->buddy[1]; - } - /* don't remotify pages that are already remotified */ - if (zh1->client_id != LOCAL_CLIENT) - zh1 = NULL; - if ((zh2 != NULL) && (zh2->client_id != LOCAL_CLIENT)) - zh2 = NULL; - - /* copy the data and metadata so can release lock */ - if (zh1 != NULL) { - xh1.client_id = zh1->client_id; - xh1.pool_id = zh1->pool_id; - xh1.oid = zh1->oid; - xh1.index = zh1->index; - size1 = zh1->size; - data1 = zbud_data(zh1, size1); - memcpy(tmpmem, zbud_data(zh1, size1), size1); - data1 = tmpmem; - tmpmem += size1; - } - if (zh2 != NULL) { - xh2.client_id = zh2->client_id; - xh2.pool_id = zh2->pool_id; - xh2.oid = zh2->oid; - xh2.index = zh2->index; - size2 = zh2->size; - memcpy(tmpmem, zbud_data(zh2, size2), size2); - data2 = tmpmem; - } - spin_unlock(&zbpg->lock); - preempt_enable(); - - /* OK, no locks held anymore, remotify one or both zbuds */ - if (zh1 != NULL) - ret = zbud_remotify_zbud(&xh1, data1, size1); - if (zh2 != NULL) - ret |= zbud_remotify_zbud(&xh2, data2, size2); - return ret; -} - -void zbud_remotify_pages(int nr) -{ - struct zbud_page *zbpg; - int i, ret; - - /* - * for now just try remotifying unbuddied pages, starting with - * least space avail - */ - for (i = 0; i < MAX_CHUNK; i++) { -retry_unbud_list_i: - preempt_disable(); /* enable in zbud_remotify_zbpg */ - spin_lock_bh(&zbud_budlists_spinlock); - if (list_empty(&zbud_unbuddied[i].list)) { - spin_unlock_bh(&zbud_budlists_spinlock); - preempt_enable(); - continue; /* next i in for loop */ - } - list_for_each_entry(zbpg, &zbud_unbuddied[i].list, bud_list) { - if (unlikely(!spin_trylock(&zbpg->lock))) - continue; /* next list_for_each_entry */ - zbud_unbuddied[i].count--; - /* want budlists unlocked when doing zbpg remotify */ - spin_unlock_bh(&zbud_budlists_spinlock); - ret = zbud_remotify_zbpg(zbpg); - /* preemption is re-enabled in zbud_remotify_zbpg */ - if (ret == 0) { - if (--nr <= 0) - goto out; - goto retry_unbud_list_i; - } - /* if fail to remotify any page, quit */ - pr_err("TESTING zbud_remotify_pages failed on page," - " trying to re-add\n"); - spin_lock_bh(&zbud_budlists_spinlock); - spin_lock(&zbpg->lock); - list_add_tail(&zbpg->bud_list, &zbud_unbuddied[i].list); - zbud_unbuddied[i].count++; - spin_unlock(&zbpg->lock); - spin_unlock_bh(&zbud_budlists_spinlock); - pr_err("TESTING zbud_remotify_pages failed on page," - " finished re-add\n"); - goto out; - } - spin_unlock_bh(&zbud_budlists_spinlock); - preempt_enable(); - } - -next_buddied_zbpg: - preempt_disable(); /* enable in zbud_remotify_zbpg */ - spin_lock_bh(&zbud_budlists_spinlock); - if (list_empty(&zbud_buddied_list)) - goto unlock_out; - list_for_each_entry(zbpg, &zbud_buddied_list, bud_list) { - if (unlikely(!spin_trylock(&zbpg->lock))) - continue; /* next list_for_each_entry */ - zcache_zbud_buddied_count--; - /* want budlists unlocked when doing zbpg remotify */ - spin_unlock_bh(&zbud_budlists_spinlock); - ret = zbud_remotify_zbpg(zbpg); - /* preemption is re-enabled in zbud_remotify_zbpg */ - if (ret == 0) { - if (--nr <= 0) - goto out; - goto next_buddied_zbpg; - } - /* if fail to remotify any page, quit */ - pr_err("TESTING zbud_remotify_pages failed on BUDDIED page," - " trying to re-add\n"); - spin_lock_bh(&zbud_budlists_spinlock); - spin_lock(&zbpg->lock); - list_add_tail(&zbpg->bud_list, &zbud_buddied_list); - zcache_zbud_buddied_count++; - spin_unlock(&zbpg->lock); - spin_unlock_bh(&zbud_budlists_spinlock); - pr_err("TESTING zbud_remotify_pages failed on BUDDIED page," - " finished re-add\n"); - goto out; - } -unlock_out: - spin_unlock_bh(&zbud_budlists_spinlock); - preempt_enable(); -out: - return; -} - -/* the "flush list" asynchronously collects pages to remotely flush */ -#define FLUSH_ENTIRE_OBJECT ((uint32_t)-1) -static void ramster_flnode_free(struct flushlist_node *, - struct tmem_pool *); - -static void zcache_remote_flush_page(struct flushlist_node *flnode) -{ - struct tmem_xhandle *xh; - int remotenode, ret; - - preempt_disable(); - xh = &flnode->xh; - remotenode = flnode->xh.client_id; - ret = ramster_remote_flush(xh, remotenode); - if (ret >= 0) - ramster_remote_pages_flushed++; - else - ramster_remote_page_flushes_failed++; - preempt_enable_no_resched(); - ramster_flnode_free(flnode, NULL); -} - -static void zcache_remote_flush_object(struct flushlist_node *flnode) -{ - struct tmem_xhandle *xh; - int remotenode, ret; - - preempt_disable(); - xh = &flnode->xh; - remotenode = flnode->xh.client_id; - ret = ramster_remote_flush_object(xh, remotenode); - if (ret >= 0) - ramster_remote_objects_flushed++; - else - ramster_remote_object_flushes_failed++; - preempt_enable_no_resched(); - ramster_flnode_free(flnode, NULL); -} - -static void zcache_remote_eph_put(struct zbud_hdr *zbud) -{ - /* FIXME */ -} - -static void zcache_remote_pers_put(struct zv_hdr *zv) -{ - struct tmem_xhandle xh; - uint16_t size; - bool ephemeral; - int remotenode, ret = -1; - char *data; - struct tmem_pool *pool; - unsigned long flags; - unsigned char cksum; - char *p; - int i; - unsigned char *tmpmem = __get_cpu_var(zcache_remoteputmem); - - ASSERT_SENTINEL(zv, ZVH); - BUG_ON(zv->client_id != LOCAL_CLIENT); - local_bh_disable(); - xh.client_id = zv->client_id; - xh.pool_id = zv->pool_id; - xh.oid = zv->oid; - xh.index = zv->index; - size = xv_get_object_size(zv) - sizeof(*zv); - BUG_ON(size == 0 || size > zv_max_page_size); - data = (char *)zv + sizeof(*zv); - for (p = data, cksum = 0, i = 0; i < size; i++) - cksum += *p; - memcpy(tmpmem, data, size); - data = tmpmem; - pool = zcache_get_pool_by_id(zv->client_id, zv->pool_id); - ephemeral = is_ephemeral(pool); - zcache_put_pool(pool); - /* now OK to release lock set in caller */ - spin_unlock(&zcache_rem_op_list_lock); - local_bh_enable(); - preempt_disable(); - ret = ramster_remote_put(&xh, data, size, ephemeral, &remotenode); - preempt_enable_no_resched(); - if (ret != 0) { - /* - * This is some form of a memory leak... if the remote put - * fails, there will never be another attempt to remotify - * this page. But since we've dropped the zv pointer, - * the page may have been freed or the data replaced - * so we can't just "put it back" in the remote op list. - * Even if we could, not sure where to put it in the list - * because there may be flushes that must be strictly - * ordered vs the put. So leave this as a FIXME for now. - * But count them so we know if it becomes a problem. - */ - ramster_pers_pages_remote_failed++; - goto out; - } else - atomic_inc(&ramster_remote_pers_pages); - ramster_pers_pages_remoted++; - /* - * data was successfully remoted so change the local version to - * point to the remote node where it landed - */ - local_bh_disable(); - pool = zcache_get_pool_by_id(LOCAL_CLIENT, xh.pool_id); - local_irq_save(flags); - (void)tmem_replace(pool, &xh.oid, xh.index, - pampd_make_remote(remotenode, size, cksum)); - local_irq_restore(flags); - zcache_put_pool(pool); - local_bh_enable(); -out: - return; -} - -static void zcache_do_remotify_ops(int nr) -{ - struct ramster_remotify_hdr *rem_op; - union remotify_list_node *u; - - while (1) { - if (!nr) - goto out; - spin_lock(&zcache_rem_op_list_lock); - if (list_empty(&zcache_rem_op_list)) { - spin_unlock(&zcache_rem_op_list_lock); - goto out; - } - rem_op = list_first_entry(&zcache_rem_op_list, - struct ramster_remotify_hdr, list); - list_del_init(&rem_op->list); - if (rem_op->op != RAMSTER_REMOTIFY_PERS_PUT) - spin_unlock(&zcache_rem_op_list_lock); - u = (union remotify_list_node *)rem_op; - switch (rem_op->op) { - case RAMSTER_REMOTIFY_EPH_PUT: -BUG(); - zcache_remote_eph_put((struct zbud_hdr *)rem_op); - break; - case RAMSTER_REMOTIFY_PERS_PUT: - zcache_remote_pers_put((struct zv_hdr *)rem_op); - break; - case RAMSTER_REMOTIFY_FLUSH_PAGE: - zcache_remote_flush_page((struct flushlist_node *)u); - break; - case RAMSTER_REMOTIFY_FLUSH_OBJ: - zcache_remote_flush_object((struct flushlist_node *)u); - break; - default: - BUG(); - } - } -out: - return; -} - -/* - * Communicate interface revision with userspace - */ -#include "cluster/ramster_nodemanager.h" -static unsigned long ramster_interface_revision = R2NM_API_VERSION; - -/* - * For now, just push over a few pages every few seconds to - * ensure that it basically works - */ -static struct workqueue_struct *ramster_remotify_workqueue; -static void ramster_remotify_process(struct work_struct *work); -static DECLARE_DELAYED_WORK(ramster_remotify_worker, - ramster_remotify_process); - -static void ramster_remotify_queue_delayed_work(unsigned long delay) -{ - if (!queue_delayed_work(ramster_remotify_workqueue, - &ramster_remotify_worker, delay)) - pr_err("ramster_remotify: bad workqueue\n"); -} - - -static int use_frontswap; -static int use_cleancache; -static int ramster_remote_target_nodenum = -1; -static void ramster_remotify_process(struct work_struct *work) -{ - static bool remotify_in_progress; - - BUG_ON(irqs_disabled()); - if (remotify_in_progress) - ramster_remotify_queue_delayed_work(HZ); - else if (ramster_remote_target_nodenum != -1) { - remotify_in_progress = true; -#ifdef CONFIG_CLEANCACHE - if (use_cleancache && ramster_eph_remotify_enable) - zbud_remotify_pages(5000); /* FIXME is this a good number? */ -#endif -#ifdef CONFIG_FRONTSWAP - if (use_frontswap && ramster_pers_remotify_enable) - zcache_do_remotify_ops(500); /* FIXME is this a good number? */ -#endif - remotify_in_progress = false; - ramster_remotify_queue_delayed_work(HZ); - } -} - -static void ramster_remotify_init(void) -{ - unsigned long n = 60UL; - ramster_remotify_workqueue = - create_singlethread_workqueue("ramster_remotify"); - ramster_remotify_queue_delayed_work(n * HZ); -} - - -static void zbud_init(void) -{ - int i; - - INIT_LIST_HEAD(&zbud_buddied_list); - zcache_zbud_buddied_count = 0; - for (i = 0; i < NCHUNKS; i++) { - INIT_LIST_HEAD(&zbud_unbuddied[i].list); - zbud_unbuddied[i].count = 0; - } -} - -#ifdef CONFIG_SYSFS -/* - * These sysfs routines show a nice distribution of how many zbpg's are - * currently (and have ever been placed) in each unbuddied list. It's fun - * to watch but can probably go away before final merge. - */ -static int zbud_show_unbuddied_list_counts(char *buf) -{ - int i; - char *p = buf; - - for (i = 0; i < NCHUNKS; i++) - p += sprintf(p, "%u ", zbud_unbuddied[i].count); - return p - buf; -} - -static int zbud_show_cumul_chunk_counts(char *buf) -{ - unsigned long i, chunks = 0, total_chunks = 0, sum_total_chunks = 0; - unsigned long total_chunks_lte_21 = 0, total_chunks_lte_32 = 0; - unsigned long total_chunks_lte_42 = 0; - char *p = buf; - - for (i = 0; i < NCHUNKS; i++) { - p += sprintf(p, "%lu ", zbud_cumul_chunk_counts[i]); - chunks += zbud_cumul_chunk_counts[i]; - total_chunks += zbud_cumul_chunk_counts[i]; - sum_total_chunks += i * zbud_cumul_chunk_counts[i]; - if (i == 21) - total_chunks_lte_21 = total_chunks; - if (i == 32) - total_chunks_lte_32 = total_chunks; - if (i == 42) - total_chunks_lte_42 = total_chunks; - } - p += sprintf(p, "<=21:%lu <=32:%lu <=42:%lu, mean:%lu\n", - total_chunks_lte_21, total_chunks_lte_32, total_chunks_lte_42, - chunks == 0 ? 0 : sum_total_chunks / chunks); - return p - buf; -} -#endif - -/********** - * This "zv" PAM implementation combines the TLSF-based xvMalloc - * with lzo1x compression to maximize the amount of data that can - * be packed into a physical page. - * - * Zv represents a PAM page with the index and object (plus a "size" value - * necessary for decompression) immediately preceding the compressed data. - */ - -/* rudimentary policy limits */ -/* total number of persistent pages may not exceed this percentage */ -static unsigned int zv_page_count_policy_percent = 75; -/* - * byte count defining poor compression; pages with greater zsize will be - * rejected - */ -static unsigned int zv_max_zsize = (PAGE_SIZE / 8) * 7; -/* - * byte count defining poor *mean* compression; pages with greater zsize - * will be rejected until sufficient better-compressed pages are accepted - * driving the mean below this threshold - */ -static unsigned int zv_max_mean_zsize = (PAGE_SIZE / 8) * 5; - -static atomic_t zv_curr_dist_counts[NCHUNKS]; -static atomic_t zv_cumul_dist_counts[NCHUNKS]; - - -static struct zv_hdr *zv_create(struct zcache_client *cli, uint32_t pool_id, - struct tmem_oid *oid, uint32_t index, - void *cdata, unsigned clen) -{ - struct page *page; - struct zv_hdr *zv = NULL; - uint32_t offset; - int alloc_size = clen + sizeof(struct zv_hdr); - int chunks = (alloc_size + (CHUNK_SIZE - 1)) >> CHUNK_SHIFT; - int ret; - - BUG_ON(!irqs_disabled()); - BUG_ON(chunks >= NCHUNKS); - ret = xv_malloc(cli->xvpool, clen + sizeof(struct zv_hdr), - &page, &offset, ZCACHE_GFP_MASK); - if (unlikely(ret)) - goto out; - atomic_inc(&zv_curr_dist_counts[chunks]); - atomic_inc(&zv_cumul_dist_counts[chunks]); - zv = kmap_atomic(page) + offset; - zv->index = index; - zv->oid = *oid; - zv->pool_id = pool_id; - SET_SENTINEL(zv, ZVH); - INIT_LIST_HEAD(&zv->rem_op.list); - zv->client_id = get_client_id_from_client(cli); - zv->rem_op.op = RAMSTER_REMOTIFY_PERS_PUT; - if (zv->client_id == LOCAL_CLIENT) { - spin_lock(&zcache_rem_op_list_lock); - list_add_tail(&zv->rem_op.list, &zcache_rem_op_list); - spin_unlock(&zcache_rem_op_list_lock); - } - memcpy((char *)zv + sizeof(struct zv_hdr), cdata, clen); - kunmap_atomic(zv); -out: - return zv; -} - -/* similar to zv_create, but just reserve space, no data yet */ -static struct zv_hdr *zv_alloc(struct tmem_pool *pool, - struct tmem_oid *oid, uint32_t index, - unsigned clen) -{ - struct zcache_client *cli = pool->client; - struct page *page; - struct zv_hdr *zv = NULL; - uint32_t offset; - int ret; - - BUG_ON(!irqs_disabled()); - BUG_ON(!is_local_client(pool->client)); - ret = xv_malloc(cli->xvpool, clen + sizeof(struct zv_hdr), - &page, &offset, ZCACHE_GFP_MASK); - if (unlikely(ret)) - goto out; - zv = kmap_atomic(page) + offset; - SET_SENTINEL(zv, ZVH); - INIT_LIST_HEAD(&zv->rem_op.list); - zv->client_id = LOCAL_CLIENT; - zv->rem_op.op = RAMSTER_INTRANSIT_PERS; - zv->index = index; - zv->oid = *oid; - zv->pool_id = pool->pool_id; - kunmap_atomic(zv); -out: - return zv; -} - -static void zv_free(struct xv_pool *xvpool, struct zv_hdr *zv) -{ - unsigned long flags; - struct page *page; - uint32_t offset; - uint16_t size = xv_get_object_size(zv); - int chunks = (size + (CHUNK_SIZE - 1)) >> CHUNK_SHIFT; - - ASSERT_SENTINEL(zv, ZVH); - BUG_ON(chunks >= NCHUNKS); - atomic_dec(&zv_curr_dist_counts[chunks]); - size -= sizeof(*zv); - spin_lock(&zcache_rem_op_list_lock); - size = xv_get_object_size(zv) - sizeof(*zv); - BUG_ON(size == 0); - INVERT_SENTINEL(zv, ZVH); - if (!list_empty(&zv->rem_op.list)) - list_del_init(&zv->rem_op.list); - spin_unlock(&zcache_rem_op_list_lock); - page = virt_to_page(zv); - offset = (unsigned long)zv & ~PAGE_MASK; - local_irq_save(flags); - xv_free(xvpool, page, offset); - local_irq_restore(flags); -} - -static void zv_decompress(struct page *page, struct zv_hdr *zv) -{ - size_t clen = PAGE_SIZE; - char *to_va; - unsigned size; - int ret; - - ASSERT_SENTINEL(zv, ZVH); - size = xv_get_object_size(zv) - sizeof(*zv); - BUG_ON(size == 0); - to_va = kmap_atomic(page); - ret = lzo1x_decompress_safe((char *)zv + sizeof(*zv), - size, to_va, &clen); - kunmap_atomic(to_va); - BUG_ON(ret != LZO_E_OK); - BUG_ON(clen != PAGE_SIZE); -} - -static void zv_copy_from_pampd(char *data, size_t *bufsize, struct zv_hdr *zv) -{ - unsigned size; - - ASSERT_SENTINEL(zv, ZVH); - size = xv_get_object_size(zv) - sizeof(*zv); - BUG_ON(size == 0 || size > zv_max_page_size); - BUG_ON(size > *bufsize); - memcpy(data, (char *)zv + sizeof(*zv), size); - *bufsize = size; -} - -static void zv_copy_to_pampd(struct zv_hdr *zv, char *data, size_t size) -{ - unsigned zv_size; - - ASSERT_SENTINEL(zv, ZVH); - zv_size = xv_get_object_size(zv) - sizeof(*zv); - BUG_ON(zv_size != size); - BUG_ON(zv_size == 0 || zv_size > zv_max_page_size); - memcpy((char *)zv + sizeof(*zv), data, size); -} - -#ifdef CONFIG_SYSFS -/* - * show a distribution of compression stats for zv pages. - */ - -static int zv_curr_dist_counts_show(char *buf) -{ - unsigned long i, n, chunks = 0, sum_total_chunks = 0; - char *p = buf; - - for (i = 0; i < NCHUNKS; i++) { - n = atomic_read(&zv_curr_dist_counts[i]); - p += sprintf(p, "%lu ", n); - chunks += n; - sum_total_chunks += i * n; - } - p += sprintf(p, "mean:%lu\n", - chunks == 0 ? 0 : sum_total_chunks / chunks); - return p - buf; -} - -static int zv_cumul_dist_counts_show(char *buf) -{ - unsigned long i, n, chunks = 0, sum_total_chunks = 0; - char *p = buf; - - for (i = 0; i < NCHUNKS; i++) { - n = atomic_read(&zv_cumul_dist_counts[i]); - p += sprintf(p, "%lu ", n); - chunks += n; - sum_total_chunks += i * n; - } - p += sprintf(p, "mean:%lu\n", - chunks == 0 ? 0 : sum_total_chunks / chunks); - return p - buf; -} - -/* - * setting zv_max_zsize via sysfs causes all persistent (e.g. swap) - * pages that don't compress to less than this value (including metadata - * overhead) to be rejected. We don't allow the value to get too close - * to PAGE_SIZE. - */ -static ssize_t zv_max_zsize_show(struct kobject *kobj, - struct kobj_attribute *attr, - char *buf) -{ - return sprintf(buf, "%u\n", zv_max_zsize); -} - -static ssize_t zv_max_zsize_store(struct kobject *kobj, - struct kobj_attribute *attr, - const char *buf, size_t count) -{ - unsigned long val; - int err; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - err = kstrtoul(buf, 10, &val); - if (err || (val == 0) || (val > (PAGE_SIZE / 8) * 7)) - return -EINVAL; - zv_max_zsize = val; - return count; -} - -/* - * setting zv_max_mean_zsize via sysfs causes all persistent (e.g. swap) - * pages that don't compress to less than this value (including metadata - * overhead) to be rejected UNLESS the mean compression is also smaller - * than this value. In other words, we are load-balancing-by-zsize the - * accepted pages. Again, we don't allow the value to get too close - * to PAGE_SIZE. - */ -static ssize_t zv_max_mean_zsize_show(struct kobject *kobj, - struct kobj_attribute *attr, - char *buf) -{ - return sprintf(buf, "%u\n", zv_max_mean_zsize); -} - -static ssize_t zv_max_mean_zsize_store(struct kobject *kobj, - struct kobj_attribute *attr, - const char *buf, size_t count) -{ - unsigned long val; - int err; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - err = kstrtoul(buf, 10, &val); - if (err || (val == 0) || (val > (PAGE_SIZE / 8) * 7)) - return -EINVAL; - zv_max_mean_zsize = val; - return count; -} - -/* - * setting zv_page_count_policy_percent via sysfs sets an upper bound of - * persistent (e.g. swap) pages that will be retained according to: - * (zv_page_count_policy_percent * totalram_pages) / 100) - * when that limit is reached, further puts will be rejected (until - * some pages have been flushed). Note that, due to compression, - * this number may exceed 100; it defaults to 75 and we set an - * arbitrary limit of 150. A poor choice will almost certainly result - * in OOM's, so this value should only be changed prudently. - */ -static ssize_t zv_page_count_policy_percent_show(struct kobject *kobj, - struct kobj_attribute *attr, - char *buf) -{ - return sprintf(buf, "%u\n", zv_page_count_policy_percent); -} - -static ssize_t zv_page_count_policy_percent_store(struct kobject *kobj, - struct kobj_attribute *attr, - const char *buf, size_t count) -{ - unsigned long val; - int err; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - err = kstrtoul(buf, 10, &val); - if (err || (val == 0) || (val > 150)) - return -EINVAL; - zv_page_count_policy_percent = val; - return count; -} - -static struct kobj_attribute zcache_zv_max_zsize_attr = { - .attr = { .name = "zv_max_zsize", .mode = 0644 }, - .show = zv_max_zsize_show, - .store = zv_max_zsize_store, -}; - -static struct kobj_attribute zcache_zv_max_mean_zsize_attr = { - .attr = { .name = "zv_max_mean_zsize", .mode = 0644 }, - .show = zv_max_mean_zsize_show, - .store = zv_max_mean_zsize_store, -}; - -static struct kobj_attribute zcache_zv_page_count_policy_percent_attr = { - .attr = { .name = "zv_page_count_policy_percent", - .mode = 0644 }, - .show = zv_page_count_policy_percent_show, - .store = zv_page_count_policy_percent_store, -}; -#endif - -/* - * zcache core code starts here - */ - -/* useful stats not collected by cleancache or frontswap */ -static unsigned long zcache_flush_total; -static unsigned long zcache_flush_found; -static unsigned long zcache_flobj_total; -static unsigned long zcache_flobj_found; -static unsigned long zcache_failed_eph_puts; -static unsigned long zcache_nonactive_puts; -static unsigned long zcache_failed_pers_puts; - -/* - * Tmem operations assume the poolid implies the invoking client. - * Zcache only has one client (the kernel itself): LOCAL_CLIENT. - * RAMster has each client numbered by cluster node, and a KVM version - * of zcache would have one client per guest and each client might - * have a poolid==N. - */ -static struct tmem_pool *zcache_get_pool_by_id(uint16_t cli_id, uint16_t poolid) -{ - struct tmem_pool *pool = NULL; - struct zcache_client *cli = NULL; - - if (cli_id == LOCAL_CLIENT) - cli = &zcache_host; - else { - if (cli_id >= MAX_CLIENTS) - goto out; - cli = &zcache_clients[cli_id]; - if (cli == NULL) - goto out; - atomic_inc(&cli->refcount); - } - if (poolid < MAX_POOLS_PER_CLIENT) { - pool = cli->tmem_pools[poolid]; - if (pool != NULL) - atomic_inc(&pool->refcount); - } -out: - return pool; -} - -static void zcache_put_pool(struct tmem_pool *pool) -{ - struct zcache_client *cli = NULL; - - if (pool == NULL) - BUG(); - cli = pool->client; - atomic_dec(&pool->refcount); - atomic_dec(&cli->refcount); -} - -int zcache_new_client(uint16_t cli_id) -{ - struct zcache_client *cli = NULL; - int ret = -1; - - if (cli_id == LOCAL_CLIENT) - cli = &zcache_host; - else if ((unsigned int)cli_id < MAX_CLIENTS) - cli = &zcache_clients[cli_id]; - if (cli == NULL) - goto out; - if (cli->allocated) - goto out; - cli->allocated = 1; -#ifdef CONFIG_FRONTSWAP - cli->xvpool = xv_create_pool(); - if (cli->xvpool == NULL) - goto out; -#endif - ret = 0; -out: - return ret; -} - -/* counters for debugging */ -static unsigned long zcache_failed_get_free_pages; -static unsigned long zcache_failed_alloc; -static unsigned long zcache_put_to_flush; - -/* - * for now, used named slabs so can easily track usage; later can - * either just use kmalloc, or perhaps add a slab-like allocator - * to more carefully manage total memory utilization - */ -static struct kmem_cache *zcache_objnode_cache; -static struct kmem_cache *zcache_obj_cache; -static struct kmem_cache *ramster_flnode_cache; -static atomic_t zcache_curr_obj_count = ATOMIC_INIT(0); -static unsigned long zcache_curr_obj_count_max; -static atomic_t zcache_curr_objnode_count = ATOMIC_INIT(0); -static unsigned long zcache_curr_objnode_count_max; - -/* - * to avoid memory allocation recursion (e.g. due to direct reclaim), we - * preload all necessary data structures so the hostops callbacks never - * actually do a malloc - */ -struct zcache_preload { - void *page; - struct tmem_obj *obj; - int nr; - struct tmem_objnode *objnodes[OBJNODE_TREE_MAX_PATH]; - struct flushlist_node *flnode; -}; -static DEFINE_PER_CPU(struct zcache_preload, zcache_preloads) = { 0, }; - -static int zcache_do_preload(struct tmem_pool *pool) -{ - struct zcache_preload *kp; - struct tmem_objnode *objnode; - struct tmem_obj *obj; - struct flushlist_node *flnode; - void *page; - int ret = -ENOMEM; - - if (unlikely(zcache_objnode_cache == NULL)) - goto out; - if (unlikely(zcache_obj_cache == NULL)) - goto out; - preempt_disable(); - kp = &__get_cpu_var(zcache_preloads); - while (kp->nr < ARRAY_SIZE(kp->objnodes)) { - preempt_enable_no_resched(); - objnode = kmem_cache_alloc(zcache_objnode_cache, - ZCACHE_GFP_MASK); - if (unlikely(objnode == NULL)) { - zcache_failed_alloc++; - goto out; - } - preempt_disable(); - kp = &__get_cpu_var(zcache_preloads); - if (kp->nr < ARRAY_SIZE(kp->objnodes)) - kp->objnodes[kp->nr++] = objnode; - else - kmem_cache_free(zcache_objnode_cache, objnode); - } - preempt_enable_no_resched(); - obj = kmem_cache_alloc(zcache_obj_cache, ZCACHE_GFP_MASK); - if (unlikely(obj == NULL)) { - zcache_failed_alloc++; - goto out; - } - flnode = kmem_cache_alloc(ramster_flnode_cache, ZCACHE_GFP_MASK); - if (unlikely(flnode == NULL)) { - zcache_failed_alloc++; - goto out; - } - if (is_ephemeral(pool)) { - page = (void *)__get_free_page(ZCACHE_GFP_MASK); - if (unlikely(page == NULL)) { - zcache_failed_get_free_pages++; - kmem_cache_free(zcache_obj_cache, obj); - kmem_cache_free(ramster_flnode_cache, flnode); - goto out; - } - } - preempt_disable(); - kp = &__get_cpu_var(zcache_preloads); - if (kp->obj == NULL) - kp->obj = obj; - else - kmem_cache_free(zcache_obj_cache, obj); - if (kp->flnode == NULL) - kp->flnode = flnode; - else - kmem_cache_free(ramster_flnode_cache, flnode); - if (is_ephemeral(pool)) { - if (kp->page == NULL) - kp->page = page; - else - free_page((unsigned long)page); - } - ret = 0; -out: - return ret; -} - -static int ramster_do_preload_flnode_only(struct tmem_pool *pool) -{ - struct zcache_preload *kp; - struct flushlist_node *flnode; - int ret = -ENOMEM; - - BUG_ON(!irqs_disabled()); - if (unlikely(ramster_flnode_cache == NULL)) - BUG(); - kp = &__get_cpu_var(zcache_preloads); - flnode = kmem_cache_alloc(ramster_flnode_cache, GFP_ATOMIC); - if (unlikely(flnode == NULL) && kp->flnode == NULL) - BUG(); /* FIXME handle more gracefully, but how??? */ - else if (kp->flnode == NULL) - kp->flnode = flnode; - else - kmem_cache_free(ramster_flnode_cache, flnode); - return ret; -} - -static void *zcache_get_free_page(void) -{ - struct zcache_preload *kp; - void *page; - - kp = &__get_cpu_var(zcache_preloads); - page = kp->page; - BUG_ON(page == NULL); - kp->page = NULL; - return page; -} - -static void zcache_free_page(void *p) -{ - free_page((unsigned long)p); -} - -/* - * zcache implementation for tmem host ops - */ - -static struct tmem_objnode *zcache_objnode_alloc(struct tmem_pool *pool) -{ - struct tmem_objnode *objnode = NULL; - unsigned long count; - struct zcache_preload *kp; - - kp = &__get_cpu_var(zcache_preloads); - if (kp->nr <= 0) - goto out; - objnode = kp->objnodes[kp->nr - 1]; - BUG_ON(objnode == NULL); - kp->objnodes[kp->nr - 1] = NULL; - kp->nr--; - count = atomic_inc_return(&zcache_curr_objnode_count); - if (count > zcache_curr_objnode_count_max) - zcache_curr_objnode_count_max = count; -out: - return objnode; -} - -static void zcache_objnode_free(struct tmem_objnode *objnode, - struct tmem_pool *pool) -{ - atomic_dec(&zcache_curr_objnode_count); - BUG_ON(atomic_read(&zcache_curr_objnode_count) < 0); - kmem_cache_free(zcache_objnode_cache, objnode); -} - -static struct tmem_obj *zcache_obj_alloc(struct tmem_pool *pool) -{ - struct tmem_obj *obj = NULL; - unsigned long count; - struct zcache_preload *kp; - - kp = &__get_cpu_var(zcache_preloads); - obj = kp->obj; - BUG_ON(obj == NULL); - kp->obj = NULL; - count = atomic_inc_return(&zcache_curr_obj_count); - if (count > zcache_curr_obj_count_max) - zcache_curr_obj_count_max = count; - return obj; -} - -static void zcache_obj_free(struct tmem_obj *obj, struct tmem_pool *pool) -{ - atomic_dec(&zcache_curr_obj_count); - BUG_ON(atomic_read(&zcache_curr_obj_count) < 0); - kmem_cache_free(zcache_obj_cache, obj); -} - -static struct flushlist_node *ramster_flnode_alloc(struct tmem_pool *pool) -{ - struct flushlist_node *flnode = NULL; - struct zcache_preload *kp; - int count; - - kp = &__get_cpu_var(zcache_preloads); - flnode = kp->flnode; - BUG_ON(flnode == NULL); - kp->flnode = NULL; - count = atomic_inc_return(&ramster_curr_flnode_count); - if (count > ramster_curr_flnode_count_max) - ramster_curr_flnode_count_max = count; - return flnode; -} - -static void ramster_flnode_free(struct flushlist_node *flnode, - struct tmem_pool *pool) -{ - atomic_dec(&ramster_curr_flnode_count); - BUG_ON(atomic_read(&ramster_curr_flnode_count) < 0); - kmem_cache_free(ramster_flnode_cache, flnode); -} - -static struct tmem_hostops zcache_hostops = { - .obj_alloc = zcache_obj_alloc, - .obj_free = zcache_obj_free, - .objnode_alloc = zcache_objnode_alloc, - .objnode_free = zcache_objnode_free, -}; - -/* - * zcache implementations for PAM page descriptor ops - */ - - -static inline void dec_and_check(atomic_t *pvar) -{ - atomic_dec(pvar); - /* later when all accounting is fixed, make this a BUG */ - WARN_ON_ONCE(atomic_read(pvar) < 0); -} - -static atomic_t zcache_curr_eph_pampd_count = ATOMIC_INIT(0); -static unsigned long zcache_curr_eph_pampd_count_max; -static atomic_t zcache_curr_pers_pampd_count = ATOMIC_INIT(0); -static unsigned long zcache_curr_pers_pampd_count_max; - -/* forward reference */ -static int zcache_compress(struct page *from, void **out_va, size_t *out_len); - -static int zcache_pampd_eph_create(char *data, size_t size, bool raw, - struct tmem_pool *pool, struct tmem_oid *oid, - uint32_t index, void **pampd) -{ - int ret = -1; - void *cdata = data; - size_t clen = size; - struct zcache_client *cli = pool->client; - uint16_t client_id = get_client_id_from_client(cli); - struct page *page = NULL; - unsigned long count; - - if (!raw) { - page = virt_to_page(data); - ret = zcache_compress(page, &cdata, &clen); - if (ret == 0) - goto out; - if (clen == 0 || clen > zbud_max_buddy_size()) { - zcache_compress_poor++; - goto out; - } - } - *pampd = (void *)zbud_create(client_id, pool->pool_id, oid, - index, page, cdata, clen); - if (*pampd == NULL) { - ret = -ENOMEM; - goto out; - } - ret = 0; - count = atomic_inc_return(&zcache_curr_eph_pampd_count); - if (count > zcache_curr_eph_pampd_count_max) - zcache_curr_eph_pampd_count_max = count; - if (client_id != LOCAL_CLIENT) { - count = atomic_inc_return(&ramster_foreign_eph_pampd_count); - if (count > ramster_foreign_eph_pampd_count_max) - ramster_foreign_eph_pampd_count_max = count; - } -out: - return ret; -} - -static int zcache_pampd_pers_create(char *data, size_t size, bool raw, - struct tmem_pool *pool, struct tmem_oid *oid, - uint32_t index, void **pampd) -{ - int ret = -1; - void *cdata = data; - size_t clen = size; - struct zcache_client *cli = pool->client; - struct page *page; - unsigned long count; - unsigned long zv_mean_zsize; - struct zv_hdr *zv; - long curr_pers_pampd_count; - u64 total_zsize; -#ifdef RAMSTER_TESTING - static bool pampd_neg_warned; -#endif - - curr_pers_pampd_count = atomic_read(&zcache_curr_pers_pampd_count) - - atomic_read(&ramster_remote_pers_pages); -#ifdef RAMSTER_TESTING - /* should always be positive, but warn if accounting is off */ - if (!pampd_neg_warned) { - pr_warn("ramster: bad accounting for curr_pers_pampd_count\n"); - pampd_neg_warned = true; - } -#endif - if (curr_pers_pampd_count > - (zv_page_count_policy_percent * totalram_pages) / 100) { - zcache_policy_percent_exceeded++; - goto out; - } - if (raw) - goto ok_to_create; - page = virt_to_page(data); - if (zcache_compress(page, &cdata, &clen) == 0) - goto out; - /* reject if compression is too poor */ - if (clen > zv_max_zsize) { - zcache_compress_poor++; - goto out; - } - /* reject if mean compression is too poor */ - if ((clen > zv_max_mean_zsize) && (curr_pers_pampd_count > 0)) { - total_zsize = xv_get_total_size_bytes(cli->xvpool); - zv_mean_zsize = div_u64(total_zsize, curr_pers_pampd_count); - if (zv_mean_zsize > zv_max_mean_zsize) { - zcache_mean_compress_poor++; - goto out; - } - } -ok_to_create: - *pampd = (void *)zv_create(cli, pool->pool_id, oid, index, cdata, clen); - if (*pampd == NULL) { - ret = -ENOMEM; - goto out; - } - ret = 0; - count = atomic_inc_return(&zcache_curr_pers_pampd_count); - if (count > zcache_curr_pers_pampd_count_max) - zcache_curr_pers_pampd_count_max = count; - if (is_local_client(cli)) - goto out; - zv = *(struct zv_hdr **)pampd; - count = atomic_inc_return(&ramster_foreign_pers_pampd_count); - if (count > ramster_foreign_pers_pampd_count_max) - ramster_foreign_pers_pampd_count_max = count; -out: - return ret; -} - -static void *zcache_pampd_create(char *data, size_t size, bool raw, int eph, - struct tmem_pool *pool, struct tmem_oid *oid, - uint32_t index) -{ - void *pampd = NULL; - int ret; - bool ephemeral; - - BUG_ON(preemptible()); - ephemeral = (eph == 1) || ((eph == 0) && is_ephemeral(pool)); - if (ephemeral) - ret = zcache_pampd_eph_create(data, size, raw, pool, - oid, index, &pampd); - else - ret = zcache_pampd_pers_create(data, size, raw, pool, - oid, index, &pampd); - /* FIXME add some counters here for failed creates? */ - return pampd; -} - -/* - * fill the pageframe corresponding to the struct page with the data - * from the passed pampd - */ -static int zcache_pampd_get_data(char *data, size_t *bufsize, bool raw, - void *pampd, struct tmem_pool *pool, - struct tmem_oid *oid, uint32_t index) -{ - int ret = 0; - - BUG_ON(preemptible()); - BUG_ON(is_ephemeral(pool)); /* Fix later for shared pools? */ - BUG_ON(pampd_is_remote(pampd)); - if (raw) - zv_copy_from_pampd(data, bufsize, pampd); - else - zv_decompress(virt_to_page(data), pampd); - return ret; -} - -static int zcache_pampd_get_data_and_free(char *data, size_t *bufsize, bool raw, - void *pampd, struct tmem_pool *pool, - struct tmem_oid *oid, uint32_t index) -{ - int ret = 0; - unsigned long flags; - struct zcache_client *cli = pool->client; - - BUG_ON(preemptible()); - BUG_ON(pampd_is_remote(pampd)); - if (is_ephemeral(pool)) { - local_irq_save(flags); - if (raw) - zbud_copy_from_pampd(data, bufsize, pampd); - else - ret = zbud_decompress(virt_to_page(data), pampd); - zbud_free_and_delist((struct zbud_hdr *)pampd); - local_irq_restore(flags); - if (!is_local_client(cli)) - dec_and_check(&ramster_foreign_eph_pampd_count); - dec_and_check(&zcache_curr_eph_pampd_count); - } else { - if (is_local_client(cli)) - BUG(); - if (raw) - zv_copy_from_pampd(data, bufsize, pampd); - else - zv_decompress(virt_to_page(data), pampd); - zv_free(cli->xvpool, pampd); - if (!is_local_client(cli)) - dec_and_check(&ramster_foreign_pers_pampd_count); - dec_and_check(&zcache_curr_pers_pampd_count); - ret = 0; - } - return ret; -} - -static bool zcache_pampd_is_remote(void *pampd) -{ - return pampd_is_remote(pampd); -} - -/* - * free the pampd and remove it from any zcache lists - * pampd must no longer be pointed to from any tmem data structures! - */ -static void zcache_pampd_free(void *pampd, struct tmem_pool *pool, - struct tmem_oid *oid, uint32_t index, bool acct) -{ - struct zcache_client *cli = pool->client; - bool eph = is_ephemeral(pool); - struct zv_hdr *zv; - - BUG_ON(preemptible()); - if (pampd_is_remote(pampd)) { - WARN_ON(acct == false); - if (oid == NULL) { - /* - * a NULL oid means to ignore this pampd free - * as the remote freeing will be handled elsewhere - */ - } else if (eph) { - /* FIXME remote flush optional but probably good idea */ - /* FIXME get these working properly again */ - dec_and_check(&zcache_curr_eph_pampd_count); - } else if (pampd_is_intransit(pampd)) { - /* did a pers remote get_and_free, so just free local */ - pampd = pampd_mask_intransit_and_remote(pampd); - goto local_pers; - } else { - struct flushlist_node *flnode = - ramster_flnode_alloc(pool); - - flnode->xh.client_id = pampd_remote_node(pampd); - flnode->xh.pool_id = pool->pool_id; - flnode->xh.oid = *oid; - flnode->xh.index = index; - flnode->rem_op.op = RAMSTER_REMOTIFY_FLUSH_PAGE; - spin_lock(&zcache_rem_op_list_lock); - list_add(&flnode->rem_op.list, &zcache_rem_op_list); - spin_unlock(&zcache_rem_op_list_lock); - dec_and_check(&zcache_curr_pers_pampd_count); - dec_and_check(&ramster_remote_pers_pages); - } - } else if (eph) { - zbud_free_and_delist((struct zbud_hdr *)pampd); - if (!is_local_client(pool->client)) - dec_and_check(&ramster_foreign_eph_pampd_count); - if (acct) - /* FIXME get these working properly again */ - dec_and_check(&zcache_curr_eph_pampd_count); - } else { -local_pers: - zv = (struct zv_hdr *)pampd; - if (!is_local_client(pool->client)) - dec_and_check(&ramster_foreign_pers_pampd_count); - zv_free(cli->xvpool, zv); - if (acct) - /* FIXME get these working properly again */ - dec_and_check(&zcache_curr_pers_pampd_count); - } -} - -static void zcache_pampd_free_obj(struct tmem_pool *pool, - struct tmem_obj *obj) -{ - struct flushlist_node *flnode; - - BUG_ON(preemptible()); - if (obj->extra == NULL) - return; - BUG_ON(!pampd_is_remote(obj->extra)); - flnode = ramster_flnode_alloc(pool); - flnode->xh.client_id = pampd_remote_node(obj->extra); - flnode->xh.pool_id = pool->pool_id; - flnode->xh.oid = obj->oid; - flnode->xh.index = FLUSH_ENTIRE_OBJECT; - flnode->rem_op.op = RAMSTER_REMOTIFY_FLUSH_OBJ; - spin_lock(&zcache_rem_op_list_lock); - list_add(&flnode->rem_op.list, &zcache_rem_op_list); - spin_unlock(&zcache_rem_op_list_lock); -} - -void zcache_pampd_new_obj(struct tmem_obj *obj) -{ - obj->extra = NULL; -} - -int zcache_pampd_replace_in_obj(void *new_pampd, struct tmem_obj *obj) -{ - int ret = -1; - - if (new_pampd != NULL) { - if (obj->extra == NULL) - obj->extra = new_pampd; - /* enforce that all remote pages in an object reside - * in the same node! */ - else if (pampd_remote_node(new_pampd) != - pampd_remote_node((void *)(obj->extra))) - BUG(); - ret = 0; - } - return ret; -} - -/* - * Called by the message handler after a (still compressed) page has been - * fetched from the remote machine in response to an "is_remote" tmem_get - * or persistent tmem_localify. For a tmem_get, "extra" is the address of - * the page that is to be filled to successfully resolve the tmem_get; for - * a (persistent) tmem_localify, "extra" is NULL (as the data is placed only - * in the local zcache). "data" points to "size" bytes of (compressed) data - * passed in the message. In the case of a persistent remote get, if - * pre-allocation was successful (see zcache_repatriate_preload), the page - * is placed into both local zcache and at "extra". - */ -int zcache_localify(int pool_id, struct tmem_oid *oidp, - uint32_t index, char *data, size_t size, - void *extra) -{ - int ret = -ENOENT; - unsigned long flags; - struct tmem_pool *pool; - bool ephemeral, delete = false; - size_t clen = PAGE_SIZE; - void *pampd, *saved_hb; - struct tmem_obj *obj; - - pool = zcache_get_pool_by_id(LOCAL_CLIENT, pool_id); - if (unlikely(pool == NULL)) - /* pool doesn't exist anymore */ - goto out; - ephemeral = is_ephemeral(pool); - local_irq_save(flags); /* FIXME: maybe only disable softirqs? */ - pampd = tmem_localify_get_pampd(pool, oidp, index, &obj, &saved_hb); - if (pampd == NULL) { - /* hmmm... must have been a flush while waiting */ -#ifdef RAMSTER_TESTING - pr_err("UNTESTED pampd==NULL in zcache_localify\n"); -#endif - if (ephemeral) - ramster_remote_eph_pages_unsucc_get++; - else - ramster_remote_pers_pages_unsucc_get++; - obj = NULL; - goto finish; - } else if (unlikely(!pampd_is_remote(pampd))) { - /* hmmm... must have been a dup put while waiting */ -#ifdef RAMSTER_TESTING - pr_err("UNTESTED dup while waiting in zcache_localify\n"); -#endif - if (ephemeral) - ramster_remote_eph_pages_unsucc_get++; - else - ramster_remote_pers_pages_unsucc_get++; - obj = NULL; - pampd = NULL; - ret = -EEXIST; - goto finish; - } else if (size == 0) { - /* no remote data, delete the local is_remote pampd */ - pampd = NULL; - if (ephemeral) - ramster_remote_eph_pages_unsucc_get++; - else - BUG(); - delete = true; - goto finish; - } - if (!ephemeral && pampd_is_intransit(pampd)) { - /* localify to zcache */ - pampd = pampd_mask_intransit_and_remote(pampd); - zv_copy_to_pampd(pampd, data, size); - } else { - pampd = NULL; - obj = NULL; - } - if (extra != NULL) { - /* decompress direct-to-memory to complete remotify */ - ret = lzo1x_decompress_safe((char *)data, size, - (char *)extra, &clen); - BUG_ON(ret != LZO_E_OK); - BUG_ON(clen != PAGE_SIZE); - } - if (ephemeral) - ramster_remote_eph_pages_succ_get++; - else - ramster_remote_pers_pages_succ_get++; - ret = 0; -finish: - tmem_localify_finish(obj, index, pampd, saved_hb, delete); - zcache_put_pool(pool); - local_irq_restore(flags); -out: - return ret; -} - -/* - * Called on a remote persistent tmem_get to attempt to preallocate - * local storage for the data contained in the remote persistent page. - * If successfully preallocated, returns the pampd, marked as remote and - * in_transit. Else returns NULL. Note that the appropriate tmem data - * structure must be locked. - */ -static void *zcache_pampd_repatriate_preload(void *pampd, - struct tmem_pool *pool, - struct tmem_oid *oid, - uint32_t index, - bool *intransit) -{ - int clen = pampd_remote_size(pampd); - void *ret_pampd = NULL; - unsigned long flags; - - if (!pampd_is_remote(pampd)) - BUG(); - if (is_ephemeral(pool)) - BUG(); - if (pampd_is_intransit(pampd)) { - /* - * to avoid multiple allocations (and maybe a memory leak) - * don't preallocate if already in the process of being - * repatriated - */ - *intransit = true; - goto out; - } - *intransit = false; - local_irq_save(flags); - ret_pampd = (void *)zv_alloc(pool, oid, index, clen); - if (ret_pampd != NULL) { - /* - * a pampd is marked intransit if it is remote and space has - * been allocated for it locally (note, only happens for - * persistent pages, in which case the remote copy is freed) - */ - ret_pampd = pampd_mark_intransit(ret_pampd); - dec_and_check(&ramster_remote_pers_pages); - } else - ramster_pers_pages_remote_nomem++; - local_irq_restore(flags); -out: - return ret_pampd; -} - -/* - * Called on a remote tmem_get to invoke a message to fetch the page. - * Might sleep so no tmem locks can be held. "extra" is passed - * all the way through the round-trip messaging to zcache_localify. - */ -static int zcache_pampd_repatriate(void *fake_pampd, void *real_pampd, - struct tmem_pool *pool, - struct tmem_oid *oid, uint32_t index, - bool free, void *extra) -{ - struct tmem_xhandle xh; - int ret; - - if (pampd_is_intransit(real_pampd)) - /* have local space pre-reserved, so free remote copy */ - free = true; - xh = tmem_xhandle_fill(LOCAL_CLIENT, pool, oid, index); - /* unreliable request/response for now */ - ret = ramster_remote_async_get(&xh, free, - pampd_remote_node(fake_pampd), - pampd_remote_size(fake_pampd), - pampd_remote_cksum(fake_pampd), - extra); -#ifdef RAMSTER_TESTING - if (ret != 0 && ret != -ENOENT) - pr_err("TESTING zcache_pampd_repatriate returns, ret=%d\n", - ret); -#endif - return ret; -} - -static struct tmem_pamops zcache_pamops = { - .create = zcache_pampd_create, - .get_data = zcache_pampd_get_data, - .free = zcache_pampd_free, - .get_data_and_free = zcache_pampd_get_data_and_free, - .free_obj = zcache_pampd_free_obj, - .is_remote = zcache_pampd_is_remote, - .repatriate_preload = zcache_pampd_repatriate_preload, - .repatriate = zcache_pampd_repatriate, - .new_obj = zcache_pampd_new_obj, - .replace_in_obj = zcache_pampd_replace_in_obj, -}; - -/* - * zcache compression/decompression and related per-cpu stuff - */ - -#define LZO_WORKMEM_BYTES LZO1X_1_MEM_COMPRESS -#define LZO_DSTMEM_PAGE_ORDER 1 -static DEFINE_PER_CPU(unsigned char *, zcache_workmem); -static DEFINE_PER_CPU(unsigned char *, zcache_dstmem); - -static int zcache_compress(struct page *from, void **out_va, size_t *out_len) -{ - int ret = 0; - unsigned char *dmem = __get_cpu_var(zcache_dstmem); - unsigned char *wmem = __get_cpu_var(zcache_workmem); - char *from_va; - - BUG_ON(!irqs_disabled()); - if (unlikely(dmem == NULL || wmem == NULL)) - goto out; /* no buffer, so can't compress */ - from_va = kmap_atomic(from); - mb(); - ret = lzo1x_1_compress(from_va, PAGE_SIZE, dmem, out_len, wmem); - BUG_ON(ret != LZO_E_OK); - *out_va = dmem; - kunmap_atomic(from_va); - ret = 1; -out: - return ret; -} - - -static int zcache_cpu_notifier(struct notifier_block *nb, - unsigned long action, void *pcpu) -{ - int cpu = (long)pcpu; - struct zcache_preload *kp; - - switch (action) { - case CPU_UP_PREPARE: - per_cpu(zcache_dstmem, cpu) = (void *)__get_free_pages( - GFP_KERNEL | __GFP_REPEAT, - LZO_DSTMEM_PAGE_ORDER), - per_cpu(zcache_workmem, cpu) = - kzalloc(LZO1X_MEM_COMPRESS, - GFP_KERNEL | __GFP_REPEAT); - per_cpu(zcache_remoteputmem, cpu) = - kzalloc(PAGE_SIZE, GFP_KERNEL | __GFP_REPEAT); - break; - case CPU_DEAD: - case CPU_UP_CANCELED: - kfree(per_cpu(zcache_remoteputmem, cpu)); - per_cpu(zcache_remoteputmem, cpu) = NULL; - free_pages((unsigned long)per_cpu(zcache_dstmem, cpu), - LZO_DSTMEM_PAGE_ORDER); - per_cpu(zcache_dstmem, cpu) = NULL; - kfree(per_cpu(zcache_workmem, cpu)); - per_cpu(zcache_workmem, cpu) = NULL; - kp = &per_cpu(zcache_preloads, cpu); - while (kp->nr) { - kmem_cache_free(zcache_objnode_cache, - kp->objnodes[kp->nr - 1]); - kp->objnodes[kp->nr - 1] = NULL; - kp->nr--; - } - if (kp->obj) { - kmem_cache_free(zcache_obj_cache, kp->obj); - kp->obj = NULL; - } - if (kp->flnode) { - kmem_cache_free(ramster_flnode_cache, kp->flnode); - kp->flnode = NULL; - } - if (kp->page) { - free_page((unsigned long)kp->page); - kp->page = NULL; - } - break; - default: - break; - } - return NOTIFY_OK; -} - -static struct notifier_block zcache_cpu_notifier_block = { - .notifier_call = zcache_cpu_notifier -}; - -#ifdef CONFIG_SYSFS -#define ZCACHE_SYSFS_RO(_name) \ - static ssize_t zcache_##_name##_show(struct kobject *kobj, \ - struct kobj_attribute *attr, char *buf) \ - { \ - return sprintf(buf, "%lu\n", zcache_##_name); \ - } \ - static struct kobj_attribute zcache_##_name##_attr = { \ - .attr = { .name = __stringify(_name), .mode = 0444 }, \ - .show = zcache_##_name##_show, \ - } - -#define ZCACHE_SYSFS_RO_ATOMIC(_name) \ - static ssize_t zcache_##_name##_show(struct kobject *kobj, \ - struct kobj_attribute *attr, char *buf) \ - { \ - return sprintf(buf, "%d\n", atomic_read(&zcache_##_name)); \ - } \ - static struct kobj_attribute zcache_##_name##_attr = { \ - .attr = { .name = __stringify(_name), .mode = 0444 }, \ - .show = zcache_##_name##_show, \ - } - -#define ZCACHE_SYSFS_RO_CUSTOM(_name, _func) \ - static ssize_t zcache_##_name##_show(struct kobject *kobj, \ - struct kobj_attribute *attr, char *buf) \ - { \ - return _func(buf); \ - } \ - static struct kobj_attribute zcache_##_name##_attr = { \ - .attr = { .name = __stringify(_name), .mode = 0444 }, \ - .show = zcache_##_name##_show, \ - } - -ZCACHE_SYSFS_RO(curr_obj_count_max); -ZCACHE_SYSFS_RO(curr_objnode_count_max); -ZCACHE_SYSFS_RO(flush_total); -ZCACHE_SYSFS_RO(flush_found); -ZCACHE_SYSFS_RO(flobj_total); -ZCACHE_SYSFS_RO(flobj_found); -ZCACHE_SYSFS_RO(failed_eph_puts); -ZCACHE_SYSFS_RO(nonactive_puts); -ZCACHE_SYSFS_RO(failed_pers_puts); -ZCACHE_SYSFS_RO(zbud_curr_zbytes); -ZCACHE_SYSFS_RO(zbud_cumul_zpages); -ZCACHE_SYSFS_RO(zbud_cumul_zbytes); -ZCACHE_SYSFS_RO(zbud_buddied_count); -ZCACHE_SYSFS_RO(evicted_raw_pages); -ZCACHE_SYSFS_RO(evicted_unbuddied_pages); -ZCACHE_SYSFS_RO(evicted_buddied_pages); -ZCACHE_SYSFS_RO(failed_get_free_pages); -ZCACHE_SYSFS_RO(failed_alloc); -ZCACHE_SYSFS_RO(put_to_flush); -ZCACHE_SYSFS_RO(compress_poor); -ZCACHE_SYSFS_RO(mean_compress_poor); -ZCACHE_SYSFS_RO(policy_percent_exceeded); -ZCACHE_SYSFS_RO_ATOMIC(zbud_curr_raw_pages); -ZCACHE_SYSFS_RO_ATOMIC(zbud_curr_zpages); -ZCACHE_SYSFS_RO_ATOMIC(curr_obj_count); -ZCACHE_SYSFS_RO_ATOMIC(curr_objnode_count); -ZCACHE_SYSFS_RO_CUSTOM(zbud_unbuddied_list_counts, - zbud_show_unbuddied_list_counts); -ZCACHE_SYSFS_RO_CUSTOM(zbud_cumul_chunk_counts, - zbud_show_cumul_chunk_counts); -ZCACHE_SYSFS_RO_CUSTOM(zv_curr_dist_counts, - zv_curr_dist_counts_show); -ZCACHE_SYSFS_RO_CUSTOM(zv_cumul_dist_counts, - zv_cumul_dist_counts_show); - -static struct attribute *zcache_attrs[] = { - &zcache_curr_obj_count_attr.attr, - &zcache_curr_obj_count_max_attr.attr, - &zcache_curr_objnode_count_attr.attr, - &zcache_curr_objnode_count_max_attr.attr, - &zcache_flush_total_attr.attr, - &zcache_flobj_total_attr.attr, - &zcache_flush_found_attr.attr, - &zcache_flobj_found_attr.attr, - &zcache_failed_eph_puts_attr.attr, - &zcache_nonactive_puts_attr.attr, - &zcache_failed_pers_puts_attr.attr, - &zcache_policy_percent_exceeded_attr.attr, - &zcache_compress_poor_attr.attr, - &zcache_mean_compress_poor_attr.attr, - &zcache_zbud_curr_raw_pages_attr.attr, - &zcache_zbud_curr_zpages_attr.attr, - &zcache_zbud_curr_zbytes_attr.attr, - &zcache_zbud_cumul_zpages_attr.attr, - &zcache_zbud_cumul_zbytes_attr.attr, - &zcache_zbud_buddied_count_attr.attr, - &zcache_evicted_raw_pages_attr.attr, - &zcache_evicted_unbuddied_pages_attr.attr, - &zcache_evicted_buddied_pages_attr.attr, - &zcache_failed_get_free_pages_attr.attr, - &zcache_failed_alloc_attr.attr, - &zcache_put_to_flush_attr.attr, - &zcache_zbud_unbuddied_list_counts_attr.attr, - &zcache_zbud_cumul_chunk_counts_attr.attr, - &zcache_zv_curr_dist_counts_attr.attr, - &zcache_zv_cumul_dist_counts_attr.attr, - &zcache_zv_max_zsize_attr.attr, - &zcache_zv_max_mean_zsize_attr.attr, - &zcache_zv_page_count_policy_percent_attr.attr, - NULL, -}; - -static struct attribute_group zcache_attr_group = { - .attrs = zcache_attrs, - .name = "zcache", -}; - -#define RAMSTER_SYSFS_RO(_name) \ - static ssize_t ramster_##_name##_show(struct kobject *kobj, \ - struct kobj_attribute *attr, char *buf) \ - { \ - return sprintf(buf, "%lu\n", ramster_##_name); \ - } \ - static struct kobj_attribute ramster_##_name##_attr = { \ - .attr = { .name = __stringify(_name), .mode = 0444 }, \ - .show = ramster_##_name##_show, \ - } - -#define RAMSTER_SYSFS_RW(_name) \ - static ssize_t ramster_##_name##_show(struct kobject *kobj, \ - struct kobj_attribute *attr, char *buf) \ - { \ - return sprintf(buf, "%lu\n", ramster_##_name); \ - } \ - static ssize_t ramster_##_name##_store(struct kobject *kobj, \ - struct kobj_attribute *attr, const char *buf, size_t count) \ - { \ - int err; \ - unsigned long enable; \ - err = kstrtoul(buf, 10, &enable); \ - if (err) \ - return -EINVAL; \ - ramster_##_name = enable; \ - return count; \ - } \ - static struct kobj_attribute ramster_##_name##_attr = { \ - .attr = { .name = __stringify(_name), .mode = 0644 }, \ - .show = ramster_##_name##_show, \ - .store = ramster_##_name##_store, \ - } - -#define RAMSTER_SYSFS_RO_ATOMIC(_name) \ - static ssize_t ramster_##_name##_show(struct kobject *kobj, \ - struct kobj_attribute *attr, char *buf) \ - { \ - return sprintf(buf, "%d\n", atomic_read(&ramster_##_name)); \ - } \ - static struct kobj_attribute ramster_##_name##_attr = { \ - .attr = { .name = __stringify(_name), .mode = 0444 }, \ - .show = ramster_##_name##_show, \ - } - -RAMSTER_SYSFS_RO(interface_revision); -RAMSTER_SYSFS_RO_ATOMIC(remote_pers_pages); -RAMSTER_SYSFS_RW(pers_remotify_enable); -RAMSTER_SYSFS_RW(eph_remotify_enable); -RAMSTER_SYSFS_RO(eph_pages_remoted); -RAMSTER_SYSFS_RO(eph_pages_remote_failed); -RAMSTER_SYSFS_RO(pers_pages_remoted); -RAMSTER_SYSFS_RO(pers_pages_remote_failed); -RAMSTER_SYSFS_RO(pers_pages_remote_nomem); -RAMSTER_SYSFS_RO(remote_pages_flushed); -RAMSTER_SYSFS_RO(remote_page_flushes_failed); -RAMSTER_SYSFS_RO(remote_objects_flushed); -RAMSTER_SYSFS_RO(remote_object_flushes_failed); -RAMSTER_SYSFS_RO(remote_eph_pages_succ_get); -RAMSTER_SYSFS_RO(remote_eph_pages_unsucc_get); -RAMSTER_SYSFS_RO(remote_pers_pages_succ_get); -RAMSTER_SYSFS_RO(remote_pers_pages_unsucc_get); -RAMSTER_SYSFS_RO_ATOMIC(foreign_eph_pampd_count); -RAMSTER_SYSFS_RO(foreign_eph_pampd_count_max); -RAMSTER_SYSFS_RO_ATOMIC(foreign_pers_pampd_count); -RAMSTER_SYSFS_RO(foreign_pers_pampd_count_max); -RAMSTER_SYSFS_RO_ATOMIC(curr_flnode_count); -RAMSTER_SYSFS_RO(curr_flnode_count_max); - -#define MANUAL_NODES 8 -static bool ramster_nodes_manual_up[MANUAL_NODES]; -static ssize_t ramster_manual_node_up_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) -{ - int i; - char *p = buf; - for (i = 0; i < MANUAL_NODES; i++) - if (ramster_nodes_manual_up[i]) - p += sprintf(p, "%d ", i); - p += sprintf(p, "\n"); - return p - buf; -} - -static ssize_t ramster_manual_node_up_store(struct kobject *kobj, - struct kobj_attribute *attr, const char *buf, size_t count) -{ - int err; - unsigned long node_num; - - err = kstrtoul(buf, 10, &node_num); - if (err) { - pr_err("ramster: bad strtoul?\n"); - return -EINVAL; - } - if (node_num >= MANUAL_NODES) { - pr_err("ramster: bad node_num=%lu?\n", node_num); - return -EINVAL; - } - if (ramster_nodes_manual_up[node_num]) { - pr_err("ramster: node %d already up, ignoring\n", - (int)node_num); - } else { - ramster_nodes_manual_up[node_num] = true; - r2net_hb_node_up_manual((int)node_num); - } - return count; -} - -static struct kobj_attribute ramster_manual_node_up_attr = { - .attr = { .name = "manual_node_up", .mode = 0644 }, - .show = ramster_manual_node_up_show, - .store = ramster_manual_node_up_store, -}; - -static ssize_t ramster_remote_target_nodenum_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) -{ - if (ramster_remote_target_nodenum == -1UL) - return sprintf(buf, "unset\n"); - else - return sprintf(buf, "%d\n", ramster_remote_target_nodenum); -} - -static ssize_t ramster_remote_target_nodenum_store(struct kobject *kobj, - struct kobj_attribute *attr, const char *buf, size_t count) -{ - int err; - unsigned long node_num; - - err = kstrtoul(buf, 10, &node_num); - if (err) { - pr_err("ramster: bad strtoul?\n"); - return -EINVAL; - } else if (node_num == -1UL) { - pr_err("ramster: disabling all remotification, " - "data may still reside on remote nodes however\n"); - return -EINVAL; - } else if (node_num >= MANUAL_NODES) { - pr_err("ramster: bad node_num=%lu?\n", node_num); - return -EINVAL; - } else if (!ramster_nodes_manual_up[node_num]) { - pr_err("ramster: node %d not up, ignoring setting " - "of remotification target\n", (int)node_num); - } else if (r2net_remote_target_node_set((int)node_num) >= 0) { - pr_info("ramster: node %d set as remotification target\n", - (int)node_num); - ramster_remote_target_nodenum = (int)node_num; - } else { - pr_err("ramster: bad num to node node_num=%d?\n", - (int)node_num); - return -EINVAL; - } - return count; -} - -static struct kobj_attribute ramster_remote_target_nodenum_attr = { - .attr = { .name = "remote_target_nodenum", .mode = 0644 }, - .show = ramster_remote_target_nodenum_show, - .store = ramster_remote_target_nodenum_store, -}; - - -static struct attribute *ramster_attrs[] = { - &ramster_interface_revision_attr.attr, - &ramster_pers_remotify_enable_attr.attr, - &ramster_eph_remotify_enable_attr.attr, - &ramster_remote_pers_pages_attr.attr, - &ramster_eph_pages_remoted_attr.attr, - &ramster_eph_pages_remote_failed_attr.attr, - &ramster_pers_pages_remoted_attr.attr, - &ramster_pers_pages_remote_failed_attr.attr, - &ramster_pers_pages_remote_nomem_attr.attr, - &ramster_remote_pages_flushed_attr.attr, - &ramster_remote_page_flushes_failed_attr.attr, - &ramster_remote_objects_flushed_attr.attr, - &ramster_remote_object_flushes_failed_attr.attr, - &ramster_remote_eph_pages_succ_get_attr.attr, - &ramster_remote_eph_pages_unsucc_get_attr.attr, - &ramster_remote_pers_pages_succ_get_attr.attr, - &ramster_remote_pers_pages_unsucc_get_attr.attr, - &ramster_foreign_eph_pampd_count_attr.attr, - &ramster_foreign_eph_pampd_count_max_attr.attr, - &ramster_foreign_pers_pampd_count_attr.attr, - &ramster_foreign_pers_pampd_count_max_attr.attr, - &ramster_curr_flnode_count_attr.attr, - &ramster_curr_flnode_count_max_attr.attr, - &ramster_manual_node_up_attr.attr, - &ramster_remote_target_nodenum_attr.attr, - NULL, -}; - -static struct attribute_group ramster_attr_group = { - .attrs = ramster_attrs, - .name = "ramster", -}; - -#endif /* CONFIG_SYSFS */ -/* - * When zcache is disabled ("frozen"), pools can be created and destroyed, - * but all puts (and thus all other operations that require memory allocation) - * must fail. If zcache is unfrozen, accepts puts, then frozen again, - * data consistency requires all puts while frozen to be converted into - * flushes. - */ -static bool zcache_freeze; - -/* - * zcache shrinker interface (only useful for ephemeral pages, so zbud only) - */ -static int shrink_zcache_memory(struct shrinker *shrink, - struct shrink_control *sc) -{ - int ret = -1; - int nr = sc->nr_to_scan; - gfp_t gfp_mask = sc->gfp_mask; - - if (nr >= 0) { - if (!(gfp_mask & __GFP_FS)) - /* does this case really need to be skipped? */ - goto out; - zbud_evict_pages(nr); - } - ret = (int)atomic_read(&zcache_zbud_curr_raw_pages); -out: - return ret; -} - -static struct shrinker zcache_shrinker = { - .shrink = shrink_zcache_memory, - .seeks = DEFAULT_SEEKS, -}; - -/* - * zcache shims between cleancache/frontswap ops and tmem - */ - -int zcache_put(int cli_id, int pool_id, struct tmem_oid *oidp, - uint32_t index, char *data, size_t size, - bool raw, int ephemeral) -{ - struct tmem_pool *pool; - int ret = -1; - - BUG_ON(!irqs_disabled()); - pool = zcache_get_pool_by_id(cli_id, pool_id); - if (unlikely(pool == NULL)) - goto out; - if (!zcache_freeze && zcache_do_preload(pool) == 0) { - /* preload does preempt_disable on success */ - ret = tmem_put(pool, oidp, index, data, size, raw, ephemeral); - if (ret < 0) { - if (is_ephemeral(pool)) - zcache_failed_eph_puts++; - else - zcache_failed_pers_puts++; - } - zcache_put_pool(pool); - preempt_enable_no_resched(); - } else { - zcache_put_to_flush++; - if (atomic_read(&pool->obj_count) > 0) - /* the put fails whether the flush succeeds or not */ - (void)tmem_flush_page(pool, oidp, index); - zcache_put_pool(pool); - } -out: - return ret; -} - -int zcache_get(int cli_id, int pool_id, struct tmem_oid *oidp, - uint32_t index, char *data, size_t *sizep, - bool raw, int get_and_free) -{ - struct tmem_pool *pool; - int ret = -1; - bool eph; - - if (!raw) { - BUG_ON(irqs_disabled()); - BUG_ON(in_softirq()); - } - pool = zcache_get_pool_by_id(cli_id, pool_id); - eph = is_ephemeral(pool); - if (likely(pool != NULL)) { - if (atomic_read(&pool->obj_count) > 0) - ret = tmem_get(pool, oidp, index, data, sizep, - raw, get_and_free); - zcache_put_pool(pool); - } - WARN_ONCE((!eph && (ret != 0)), "zcache_get fails on persistent pool, " - "bad things are very likely to happen soon\n"); -#ifdef RAMSTER_TESTING - if (ret != 0 && ret != -1 && !(ret == -EINVAL && is_ephemeral(pool))) - pr_err("TESTING zcache_get tmem_get returns ret=%d\n", ret); -#endif - if (ret == -EAGAIN) - BUG(); /* FIXME... don't need this anymore??? let's ensure */ - return ret; -} - -int zcache_flush(int cli_id, int pool_id, - struct tmem_oid *oidp, uint32_t index) -{ - struct tmem_pool *pool; - int ret = -1; - unsigned long flags; - - local_irq_save(flags); - zcache_flush_total++; - pool = zcache_get_pool_by_id(cli_id, pool_id); - ramster_do_preload_flnode_only(pool); - if (likely(pool != NULL)) { - if (atomic_read(&pool->obj_count) > 0) - ret = tmem_flush_page(pool, oidp, index); - zcache_put_pool(pool); - } - if (ret >= 0) - zcache_flush_found++; - local_irq_restore(flags); - return ret; -} - -int zcache_flush_object(int cli_id, int pool_id, struct tmem_oid *oidp) -{ - struct tmem_pool *pool; - int ret = -1; - unsigned long flags; - - local_irq_save(flags); - zcache_flobj_total++; - pool = zcache_get_pool_by_id(cli_id, pool_id); - ramster_do_preload_flnode_only(pool); - if (likely(pool != NULL)) { - if (atomic_read(&pool->obj_count) > 0) - ret = tmem_flush_object(pool, oidp); - zcache_put_pool(pool); - } - if (ret >= 0) - zcache_flobj_found++; - local_irq_restore(flags); - return ret; -} - -int zcache_client_destroy_pool(int cli_id, int pool_id) -{ - struct tmem_pool *pool = NULL; - struct zcache_client *cli = NULL; - int ret = -1; - - if (pool_id < 0) - goto out; - if (cli_id == LOCAL_CLIENT) - cli = &zcache_host; - else if ((unsigned int)cli_id < MAX_CLIENTS) - cli = &zcache_clients[cli_id]; - if (cli == NULL) - goto out; - atomic_inc(&cli->refcount); - pool = cli->tmem_pools[pool_id]; - if (pool == NULL) - goto out; - cli->tmem_pools[pool_id] = NULL; - /* wait for pool activity on other cpus to quiesce */ - while (atomic_read(&pool->refcount) != 0) - ; - atomic_dec(&cli->refcount); - local_bh_disable(); - ret = tmem_destroy_pool(pool); - local_bh_enable(); - kfree(pool); - pr_info("ramster: destroyed pool id=%d cli_id=%d\n", pool_id, cli_id); -out: - return ret; -} - -static int zcache_destroy_pool(int pool_id) -{ - return zcache_client_destroy_pool(LOCAL_CLIENT, pool_id); -} - -int zcache_new_pool(uint16_t cli_id, uint32_t flags) -{ - int poolid = -1; - struct tmem_pool *pool; - struct zcache_client *cli = NULL; - - if (cli_id == LOCAL_CLIENT) - cli = &zcache_host; - else if ((unsigned int)cli_id < MAX_CLIENTS) - cli = &zcache_clients[cli_id]; - if (cli == NULL) - goto out; - atomic_inc(&cli->refcount); - pool = kmalloc(sizeof(struct tmem_pool), GFP_ATOMIC); - if (pool == NULL) { - pr_info("ramster: pool creation failed: out of memory\n"); - goto out; - } - - for (poolid = 0; poolid < MAX_POOLS_PER_CLIENT; poolid++) - if (cli->tmem_pools[poolid] == NULL) - break; - if (poolid >= MAX_POOLS_PER_CLIENT) { - pr_info("ramster: pool creation failed: max exceeded\n"); - kfree(pool); - poolid = -1; - goto out; - } - atomic_set(&pool->refcount, 0); - pool->client = cli; - pool->pool_id = poolid; - tmem_new_pool(pool, flags); - cli->tmem_pools[poolid] = pool; - if (cli_id == LOCAL_CLIENT) - pr_info("ramster: created %s tmem pool, id=%d, local client\n", - flags & TMEM_POOL_PERSIST ? "persistent" : "ephemeral", - poolid); - else - pr_info("ramster: created %s tmem pool, id=%d, client=%d\n", - flags & TMEM_POOL_PERSIST ? "persistent" : "ephemeral", - poolid, cli_id); -out: - if (cli != NULL) - atomic_dec(&cli->refcount); - return poolid; -} - -static int zcache_local_new_pool(uint32_t flags) -{ - return zcache_new_pool(LOCAL_CLIENT, flags); -} - -int zcache_autocreate_pool(int cli_id, int pool_id, bool ephemeral) -{ - struct tmem_pool *pool; - struct zcache_client *cli = NULL; - uint32_t flags = ephemeral ? 0 : TMEM_POOL_PERSIST; - int ret = -1; - - if (cli_id == LOCAL_CLIENT) - goto out; - if (pool_id >= MAX_POOLS_PER_CLIENT) - goto out; - else if ((unsigned int)cli_id < MAX_CLIENTS) - cli = &zcache_clients[cli_id]; - if ((ephemeral && !use_cleancache) || (!ephemeral && !use_frontswap)) - BUG(); /* FIXME, handle more gracefully later */ - if (!cli->allocated) { - if (zcache_new_client(cli_id)) - BUG(); /* FIXME, handle more gracefully later */ - cli = &zcache_clients[cli_id]; - } - atomic_inc(&cli->refcount); - pool = cli->tmem_pools[pool_id]; - if (pool != NULL) { - if (pool->persistent && ephemeral) { - pr_err("zcache_autocreate_pool: type mismatch\n"); - goto out; - } - ret = 0; - goto out; - } - pool = kmalloc(sizeof(struct tmem_pool), GFP_KERNEL); - if (pool == NULL) { - pr_info("ramster: pool creation failed: out of memory\n"); - goto out; - } - atomic_set(&pool->refcount, 0); - pool->client = cli; - pool->pool_id = pool_id; - tmem_new_pool(pool, flags); - cli->tmem_pools[pool_id] = pool; - pr_info("ramster: AUTOcreated %s tmem poolid=%d, for remote client=%d\n", - flags & TMEM_POOL_PERSIST ? "persistent" : "ephemeral", - pool_id, cli_id); - ret = 0; -out: - if (cli == NULL) - BUG(); /* FIXME, handle more gracefully later */ - /* pr_err("zcache_autocreate_pool: failed\n"); */ - if (cli != NULL) - atomic_dec(&cli->refcount); - return ret; -} - -/********** - * Two kernel functionalities currently can be layered on top of tmem. - * These are "cleancache" which is used as a second-chance cache for clean - * page cache pages; and "frontswap" which is used for swap pages - * to avoid writes to disk. A generic "shim" is provided here for each - * to translate in-kernel semantics to zcache semantics. - */ - -#ifdef CONFIG_CLEANCACHE -static void zcache_cleancache_put_page(int pool_id, - struct cleancache_filekey key, - pgoff_t index, struct page *page) -{ - u32 ind = (u32) index; - struct tmem_oid oid = *(struct tmem_oid *)&key; - -#ifdef __PG_WAS_ACTIVE - if (!PageWasActive(page)) { - zcache_nonactive_puts++; - return; - } -#endif - if (likely(ind == index)) { - char *kva = page_address(page); - - (void)zcache_put(LOCAL_CLIENT, pool_id, &oid, index, - kva, PAGE_SIZE, 0, 1); - } -} - -static int zcache_cleancache_get_page(int pool_id, - struct cleancache_filekey key, - pgoff_t index, struct page *page) -{ - u32 ind = (u32) index; - struct tmem_oid oid = *(struct tmem_oid *)&key; - int ret = -1; - - preempt_disable(); - if (likely(ind == index)) { - char *kva = page_address(page); - size_t size = PAGE_SIZE; - - ret = zcache_get(LOCAL_CLIENT, pool_id, &oid, index, - kva, &size, 0, 0); -#ifdef __PG_WAS_ACTIVE - if (ret == 0) - SetPageWasActive(page); -#endif - } - preempt_enable(); - return ret; -} - -static void zcache_cleancache_flush_page(int pool_id, - struct cleancache_filekey key, - pgoff_t index) -{ - u32 ind = (u32) index; - struct tmem_oid oid = *(struct tmem_oid *)&key; - - if (likely(ind == index)) - (void)zcache_flush(LOCAL_CLIENT, pool_id, &oid, ind); -} - -static void zcache_cleancache_flush_inode(int pool_id, - struct cleancache_filekey key) -{ - struct tmem_oid oid = *(struct tmem_oid *)&key; - - (void)zcache_flush_object(LOCAL_CLIENT, pool_id, &oid); -} - -static void zcache_cleancache_flush_fs(int pool_id) -{ - if (pool_id >= 0) - (void)zcache_destroy_pool(pool_id); -} - -static int zcache_cleancache_init_fs(size_t pagesize) -{ - BUG_ON(sizeof(struct cleancache_filekey) != - sizeof(struct tmem_oid)); - BUG_ON(pagesize != PAGE_SIZE); - return zcache_local_new_pool(0); -} - -static int zcache_cleancache_init_shared_fs(char *uuid, size_t pagesize) -{ - /* shared pools are unsupported and map to private */ - BUG_ON(sizeof(struct cleancache_filekey) != - sizeof(struct tmem_oid)); - BUG_ON(pagesize != PAGE_SIZE); - return zcache_local_new_pool(0); -} - -static struct cleancache_ops zcache_cleancache_ops = { - .put_page = zcache_cleancache_put_page, - .get_page = zcache_cleancache_get_page, - .invalidate_page = zcache_cleancache_flush_page, - .invalidate_inode = zcache_cleancache_flush_inode, - .invalidate_fs = zcache_cleancache_flush_fs, - .init_shared_fs = zcache_cleancache_init_shared_fs, - .init_fs = zcache_cleancache_init_fs -}; - -struct cleancache_ops zcache_cleancache_register_ops(void) -{ - struct cleancache_ops old_ops = - cleancache_register_ops(&zcache_cleancache_ops); - - return old_ops; -} -#endif - -#ifdef CONFIG_FRONTSWAP -/* a single tmem poolid is used for all frontswap "types" (swapfiles) */ -static int zcache_frontswap_poolid = -1; - -/* - * Swizzling increases objects per swaptype, increasing tmem concurrency - * for heavy swaploads. Later, larger nr_cpus -> larger SWIZ_BITS - */ -#define SWIZ_BITS 8 -#define SWIZ_MASK ((1 << SWIZ_BITS) - 1) -#define _oswiz(_type, _ind) ((_type << SWIZ_BITS) | (_ind & SWIZ_MASK)) -#define iswiz(_ind) (_ind >> SWIZ_BITS) - -static inline struct tmem_oid oswiz(unsigned type, u32 ind) -{ - struct tmem_oid oid = { .oid = { 0 } }; - oid.oid[0] = _oswiz(type, ind); - return oid; -} - -static int zcache_frontswap_store(unsigned type, pgoff_t offset, - struct page *page) -{ - u64 ind64 = (u64)offset; - u32 ind = (u32)offset; - struct tmem_oid oid = oswiz(type, ind); - int ret = -1; - unsigned long flags; - char *kva; - - BUG_ON(!PageLocked(page)); - if (likely(ind64 == ind)) { - local_irq_save(flags); - kva = page_address(page); - ret = zcache_put(LOCAL_CLIENT, zcache_frontswap_poolid, - &oid, iswiz(ind), kva, PAGE_SIZE, 0, 0); - local_irq_restore(flags); - } - return ret; -} - -/* returns 0 if the page was successfully gotten from frontswap, -1 if - * was not present (should never happen!) */ -static int zcache_frontswap_load(unsigned type, pgoff_t offset, - struct page *page) -{ - u64 ind64 = (u64)offset; - u32 ind = (u32)offset; - struct tmem_oid oid = oswiz(type, ind); - int ret = -1; - - preempt_disable(); /* FIXME, remove this? */ - BUG_ON(!PageLocked(page)); - if (likely(ind64 == ind)) { - char *kva = page_address(page); - size_t size = PAGE_SIZE; - - ret = zcache_get(LOCAL_CLIENT, zcache_frontswap_poolid, - &oid, iswiz(ind), kva, &size, 0, -1); - } - preempt_enable(); /* FIXME, remove this? */ - return ret; -} - -/* flush a single page from frontswap */ -static void zcache_frontswap_flush_page(unsigned type, pgoff_t offset) -{ - u64 ind64 = (u64)offset; - u32 ind = (u32)offset; - struct tmem_oid oid = oswiz(type, ind); - - if (likely(ind64 == ind)) - (void)zcache_flush(LOCAL_CLIENT, zcache_frontswap_poolid, - &oid, iswiz(ind)); -} - -/* flush all pages from the passed swaptype */ -static void zcache_frontswap_flush_area(unsigned type) -{ - struct tmem_oid oid; - int ind; - - for (ind = SWIZ_MASK; ind >= 0; ind--) { - oid = oswiz(type, ind); - (void)zcache_flush_object(LOCAL_CLIENT, - zcache_frontswap_poolid, &oid); - } -} - -static void zcache_frontswap_init(unsigned ignored) -{ - /* a single tmem poolid is used for all frontswap "types" (swapfiles) */ - if (zcache_frontswap_poolid < 0) - zcache_frontswap_poolid = - zcache_local_new_pool(TMEM_POOL_PERSIST); -} - -static struct frontswap_ops zcache_frontswap_ops = { - .store = zcache_frontswap_store, - .load = zcache_frontswap_load, - .invalidate_page = zcache_frontswap_flush_page, - .invalidate_area = zcache_frontswap_flush_area, - .init = zcache_frontswap_init -}; - -struct frontswap_ops zcache_frontswap_register_ops(void) -{ - struct frontswap_ops old_ops = - frontswap_register_ops(&zcache_frontswap_ops); - - return old_ops; -} -#endif - -/* - * frontswap selfshrinking - */ - -#ifdef CONFIG_FRONTSWAP -/* In HZ, controls frequency of worker invocation. */ -static unsigned int selfshrink_interval __read_mostly = 5; - -static void selfshrink_process(struct work_struct *work); -static DECLARE_DELAYED_WORK(selfshrink_worker, selfshrink_process); - -/* Enable/disable with sysfs. */ -static bool frontswap_selfshrinking __read_mostly; - -/* Enable/disable with kernel boot option. */ -static bool use_frontswap_selfshrink __initdata = true; - -/* - * The default values for the following parameters were deemed reasonable - * by experimentation, may be workload-dependent, and can all be - * adjusted via sysfs. - */ - -/* Control rate for frontswap shrinking. Higher hysteresis is slower. */ -static unsigned int frontswap_hysteresis __read_mostly = 20; - -/* - * Number of selfshrink worker invocations to wait before observing that - * frontswap selfshrinking should commence. Note that selfshrinking does - * not use a separate worker thread. - */ -static unsigned int frontswap_inertia __read_mostly = 3; - -/* Countdown to next invocation of frontswap_shrink() */ -static unsigned long frontswap_inertia_counter; - -/* - * Invoked by the selfshrink worker thread, uses current number of pages - * in frontswap (frontswap_curr_pages()), previous status, and control - * values (hysteresis and inertia) to determine if frontswap should be - * shrunk and what the new frontswap size should be. Note that - * frontswap_shrink is essentially a partial swapoff that immediately - * transfers pages from the "swap device" (frontswap) back into kernel - * RAM; despite the name, frontswap "shrinking" is very different from - * the "shrinker" interface used by the kernel MM subsystem to reclaim - * memory. - */ -static void frontswap_selfshrink(void) -{ - static unsigned long cur_frontswap_pages; - static unsigned long last_frontswap_pages; - static unsigned long tgt_frontswap_pages; - - last_frontswap_pages = cur_frontswap_pages; - cur_frontswap_pages = frontswap_curr_pages(); - if (!cur_frontswap_pages || - (cur_frontswap_pages > last_frontswap_pages)) { - frontswap_inertia_counter = frontswap_inertia; - return; - } - if (frontswap_inertia_counter && --frontswap_inertia_counter) - return; - if (cur_frontswap_pages <= frontswap_hysteresis) - tgt_frontswap_pages = 0; - else - tgt_frontswap_pages = cur_frontswap_pages - - (cur_frontswap_pages / frontswap_hysteresis); - frontswap_shrink(tgt_frontswap_pages); -} - -static int __init ramster_nofrontswap_selfshrink_setup(char *s) -{ - use_frontswap_selfshrink = false; - return 1; -} - -__setup("noselfshrink", ramster_nofrontswap_selfshrink_setup); - -static void selfshrink_process(struct work_struct *work) -{ - if (frontswap_selfshrinking && frontswap_enabled) { - frontswap_selfshrink(); - schedule_delayed_work(&selfshrink_worker, - selfshrink_interval * HZ); - } -} - -static int ramster_enabled; - -static int __init ramster_selfshrink_init(void) -{ - frontswap_selfshrinking = ramster_enabled && use_frontswap_selfshrink; - if (frontswap_selfshrinking) - pr_info("ramster: Initializing frontswap " - "selfshrinking driver.\n"); - else - return -ENODEV; - - schedule_delayed_work(&selfshrink_worker, selfshrink_interval * HZ); - - return 0; -} - -subsys_initcall(ramster_selfshrink_init); -#endif - -/* - * zcache initialization - * NOTE FOR NOW ramster MUST BE PROVIDED AS A KERNEL BOOT PARAMETER OR - * NOTHING HAPPENS! - */ - -static int ramster_enabled; - -static int __init enable_ramster(char *s) -{ - ramster_enabled = 1; - return 1; -} -__setup("ramster", enable_ramster); - -/* allow independent dynamic disabling of cleancache and frontswap */ - -static int use_cleancache = 1; - -static int __init no_cleancache(char *s) -{ - pr_info("INIT no_cleancache called\n"); - use_cleancache = 0; - return 1; -} - -/* - * FIXME: need to guarantee this gets checked before zcache_init is called - * What is the correct way to achieve this? - */ -early_param("nocleancache", no_cleancache); - -static int use_frontswap = 1; - -static int __init no_frontswap(char *s) -{ - pr_info("INIT no_frontswap called\n"); - use_frontswap = 0; - return 1; -} - -__setup("nofrontswap", no_frontswap); - -static int __init zcache_init(void) -{ - int ret = 0; - -#ifdef CONFIG_SYSFS - ret = sysfs_create_group(mm_kobj, &zcache_attr_group); - ret = sysfs_create_group(mm_kobj, &ramster_attr_group); - if (ret) { - pr_err("ramster: can't create sysfs\n"); - goto out; - } -#endif /* CONFIG_SYSFS */ -#if defined(CONFIG_CLEANCACHE) || defined(CONFIG_FRONTSWAP) - if (ramster_enabled) { - unsigned int cpu; - - (void)r2net_register_handlers(); - tmem_register_hostops(&zcache_hostops); - tmem_register_pamops(&zcache_pamops); - ret = register_cpu_notifier(&zcache_cpu_notifier_block); - if (ret) { - pr_err("ramster: can't register cpu notifier\n"); - goto out; - } - for_each_online_cpu(cpu) { - void *pcpu = (void *)(long)cpu; - zcache_cpu_notifier(&zcache_cpu_notifier_block, - CPU_UP_PREPARE, pcpu); - } - } - zcache_objnode_cache = kmem_cache_create("zcache_objnode", - sizeof(struct tmem_objnode), 0, 0, NULL); - zcache_obj_cache = kmem_cache_create("zcache_obj", - sizeof(struct tmem_obj), 0, 0, NULL); - ramster_flnode_cache = kmem_cache_create("ramster_flnode", - sizeof(struct flushlist_node), 0, 0, NULL); -#endif -#ifdef CONFIG_CLEANCACHE - pr_info("INIT ramster_enabled=%d use_cleancache=%d\n", - ramster_enabled, use_cleancache); - if (ramster_enabled && use_cleancache) { - struct cleancache_ops old_ops; - - zbud_init(); - register_shrinker(&zcache_shrinker); - old_ops = zcache_cleancache_register_ops(); - pr_info("ramster: cleancache enabled using kernel " - "transcendent memory and compression buddies\n"); - if (old_ops.init_fs != NULL) - pr_warning("ramster: cleancache_ops overridden"); - } -#endif -#ifdef CONFIG_FRONTSWAP - pr_info("INIT ramster_enabled=%d use_frontswap=%d\n", - ramster_enabled, use_frontswap); - if (ramster_enabled && use_frontswap) { - struct frontswap_ops old_ops; - - zcache_new_client(LOCAL_CLIENT); - old_ops = zcache_frontswap_register_ops(); - pr_info("ramster: frontswap enabled using kernel " - "transcendent memory and xvmalloc\n"); - if (old_ops.init != NULL) - pr_warning("ramster: frontswap_ops overridden"); - } - if (ramster_enabled && (use_frontswap || use_cleancache)) - ramster_remotify_init(); -#endif -out: - return ret; -} - -module_init(zcache_init) diff --git a/drivers/staging/ramster/zcache.h b/drivers/staging/ramster/zcache.h deleted file mode 100644 index 250b121c22e5..000000000000 --- a/drivers/staging/ramster/zcache.h +++ /dev/null @@ -1,22 +0,0 @@ -/* - * zcache.h - * - * External zcache functions - * - * Copyright (c) 2009-2012, Dan Magenheimer, Oracle Corp. - */ - -#ifndef _ZCACHE_H_ -#define _ZCACHE_H_ - -extern int zcache_put(int, int, struct tmem_oid *, uint32_t, - char *, size_t, bool, int); -extern int zcache_autocreate_pool(int, int, bool); -extern int zcache_get(int, int, struct tmem_oid *, uint32_t, - char *, size_t *, bool, int); -extern int zcache_flush(int, int, struct tmem_oid *, uint32_t); -extern int zcache_flush_object(int, int, struct tmem_oid *); -extern int zcache_localify(int, struct tmem_oid *, uint32_t, - char *, size_t, void *); - -#endif /* _ZCACHE_H */ |
