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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
#include "lock_dlm.h"
int gdlm_drop_count;
int gdlm_drop_period;
const struct lm_lockops gdlm_ops;
static struct gdlm_ls *init_gdlm(lm_callback_t cb, struct gfs2_sbd *sdp,
int flags, char *table_name)
{
struct gdlm_ls *ls;
char buf[256], *p;
ls = kzalloc(sizeof(struct gdlm_ls), GFP_KERNEL);
if (!ls)
return NULL;
ls->drop_locks_count = gdlm_drop_count;
ls->drop_locks_period = gdlm_drop_period;
ls->fscb = cb;
ls->sdp = sdp;
ls->fsflags = flags;
spin_lock_init(&ls->async_lock);
INIT_LIST_HEAD(&ls->complete);
INIT_LIST_HEAD(&ls->blocking);
INIT_LIST_HEAD(&ls->delayed);
INIT_LIST_HEAD(&ls->submit);
INIT_LIST_HEAD(&ls->all_locks);
init_waitqueue_head(&ls->thread_wait);
init_waitqueue_head(&ls->wait_control);
ls->thread1 = NULL;
ls->thread2 = NULL;
ls->drop_time = jiffies;
ls->jid = -1;
strncpy(buf, table_name, 256);
buf[255] = '\0';
p = strchr(buf, ':');
if (!p) {
log_info("invalid table_name \"%s\"", table_name);
kfree(ls);
return NULL;
}
*p = '\0';
p++;
strncpy(ls->clustername, buf, GDLM_NAME_LEN);
strncpy(ls->fsname, p, GDLM_NAME_LEN);
return ls;
}
static int make_args(struct gdlm_ls *ls, char *data_arg, int *nodir)
{
char data[256];
char *options, *x, *y;
int error = 0;
memset(data, 0, 256);
strncpy(data, data_arg, 255);
for (options = data; (x = strsep(&options, ":")); ) {
if (!*x)
continue;
y = strchr(x, '=');
if (y)
*y++ = 0;
if (!strcmp(x, "jid")) {
if (!y) {
log_error("need argument to jid");
error = -EINVAL;
break;
}
sscanf(y, "%u", &ls->jid);
} else if (!strcmp(x, "first")) {
if (!y) {
log_error("need argument to first");
error = -EINVAL;
break;
}
sscanf(y, "%u", &ls->first);
} else if (!strcmp(x, "id")) {
if (!y) {
log_error("need argument to id");
error = -EINVAL;
break;
}
sscanf(y, "%u", &ls->id);
} else if (!strcmp(x, "nodir")) {
if (!y) {
log_error("need argument to nodir");
error = -EINVAL;
break;
}
sscanf(y, "%u", nodir);
} else {
log_error("unkonwn option: %s", x);
error = -EINVAL;
break;
}
}
return error;
}
static int gdlm_mount(char *table_name, char *host_data,
lm_callback_t cb, void *cb_data,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct,
struct kobject *fskobj)
{
struct gdlm_ls *ls;
int error = -ENOMEM, nodir = 0;
if (min_lvb_size > GDLM_LVB_SIZE)
goto out;
ls = init_gdlm(cb, cb_data, flags, table_name);
if (!ls)
goto out;
error = make_args(ls, host_data, &nodir);
if (error)
goto out;
error = gdlm_init_threads(ls);
if (error)
goto out_free;
error = gdlm_kobject_setup(ls, fskobj);
if (error)
goto out_thread;
error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
&ls->dlm_lockspace,
nodir ? DLM_LSFL_NODIR : 0,
GDLM_LVB_SIZE);
if (error) {
log_error("dlm_new_lockspace error %d", error);
goto out_kobj;
}
lockstruct->ls_jid = ls->jid;
lockstruct->ls_first = ls->first;
lockstruct->ls_lockspace = ls;
lockstruct->ls_ops = &gdlm_ops;
lockstruct->ls_flags = 0;
lockstruct->ls_lvb_size = GDLM_LVB_SIZE;
return 0;
out_kobj:
gdlm_kobject_release(ls);
out_thread:
gdlm_release_threads(ls);
out_free:
kfree(ls);
out:
return error;
}
static void gdlm_unmount(void *lockspace)
{
struct gdlm_ls *ls = lockspace;
int rv;
log_debug("unmount flags %lx", ls->flags);
/* FIXME: serialize unmount and withdraw in case they
happen at once. Also, if unmount follows withdraw,
wait for withdraw to finish. */
if (test_bit(DFL_WITHDRAW, &ls->flags))
goto out;
gdlm_kobject_release(ls);
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
rv = gdlm_release_all_locks(ls);
if (rv)
log_info("gdlm_unmount: %d stray locks freed", rv);
out:
kfree(ls);
}
static void gdlm_recovery_done(void *lockspace, unsigned int jid,
unsigned int message)
{
struct gdlm_ls *ls = lockspace;
ls->recover_jid_done = jid;
ls->recover_jid_status = message;
kobject_uevent(&ls->kobj, KOBJ_CHANGE);
}
static void gdlm_others_may_mount(void *lockspace)
{
struct gdlm_ls *ls = lockspace;
ls->first_done = 1;
kobject_uevent(&ls->kobj, KOBJ_CHANGE);
}
/* Userspace gets the offline uevent, blocks new gfs locks on
other mounters, and lets us know (sets WITHDRAW flag). Then,
userspace leaves the mount group while we leave the lockspace. */
static void gdlm_withdraw(void *lockspace)
{
struct gdlm_ls *ls = lockspace;
kobject_uevent(&ls->kobj, KOBJ_OFFLINE);
wait_event_interruptible(ls->wait_control,
test_bit(DFL_WITHDRAW, &ls->flags));
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
gdlm_release_all_locks(ls);
gdlm_kobject_release(ls);
}
const struct lm_lockops gdlm_ops = {
.lm_proto_name = "lock_dlm",
.lm_mount = gdlm_mount,
.lm_others_may_mount = gdlm_others_may_mount,
.lm_unmount = gdlm_unmount,
.lm_withdraw = gdlm_withdraw,
.lm_get_lock = gdlm_get_lock,
.lm_put_lock = gdlm_put_lock,
.lm_lock = gdlm_lock,
.lm_unlock = gdlm_unlock,
.lm_plock = gdlm_plock,
.lm_punlock = gdlm_punlock,
.lm_plock_get = gdlm_plock_get,
.lm_cancel = gdlm_cancel,
.lm_hold_lvb = gdlm_hold_lvb,
.lm_unhold_lvb = gdlm_unhold_lvb,
.lm_recovery_done = gdlm_recovery_done,
.lm_owner = THIS_MODULE,
};
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