diff options
| -rw-r--r-- | fs/nilfs2/bmap.c | 783 | ||||
| -rw-r--r-- | fs/nilfs2/bmap.h | 244 | ||||
| -rw-r--r-- | fs/nilfs2/bmap_union.h | 42 |
3 files changed, 1069 insertions, 0 deletions
diff --git a/fs/nilfs2/bmap.c b/fs/nilfs2/bmap.c new file mode 100644 index 000000000000..6fe72addc9c5 --- /dev/null +++ b/fs/nilfs2/bmap.c @@ -0,0 +1,783 @@ +/* + * bmap.c - NILFS block mapping. + * + * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Written by Koji Sato <koji@osrg.net>. + */ + +#include <linux/fs.h> +#include <linux/string.h> +#include <linux/errno.h> +#include "nilfs.h" +#include "bmap.h" +#include "sb.h" +#include "btnode.h" +#include "mdt.h" +#include "dat.h" +#include "alloc.h" + +int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level, + __u64 *ptrp) +{ + __u64 ptr; + int ret; + + down_read(&bmap->b_sem); + ret = (*bmap->b_ops->bop_lookup)(bmap, key, level, ptrp); + if (ret < 0) + goto out; + if (bmap->b_pops->bpop_translate != NULL) { + ret = (*bmap->b_pops->bpop_translate)(bmap, *ptrp, &ptr); + if (ret < 0) + goto out; + *ptrp = ptr; + } + + out: + up_read(&bmap->b_sem); + return ret; +} + + +/** + * nilfs_bmap_lookup - find a record + * @bmap: bmap + * @key: key + * @recp: pointer to record + * + * Description: nilfs_bmap_lookup() finds a record whose key matches @key in + * @bmap. + * + * Return Value: On success, 0 is returned and the record associated with @key + * is stored in the place pointed by @recp. On error, one of the following + * negative error codes is returned. + * + * %-EIO - I/O error. + * + * %-ENOMEM - Insufficient amount of memory available. + * + * %-ENOENT - A record associated with @key does not exist. + */ +int nilfs_bmap_lookup(struct nilfs_bmap *bmap, + unsigned long key, + unsigned long *recp) +{ + __u64 ptr; + int ret; + + /* XXX: use macro for level 1 */ + ret = nilfs_bmap_lookup_at_level(bmap, key, 1, &ptr); + if (recp != NULL) + *recp = ptr; + return ret; +} + +static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr) +{ + __u64 keys[NILFS_BMAP_SMALL_HIGH + 1]; + __u64 ptrs[NILFS_BMAP_SMALL_HIGH + 1]; + int ret, n; + + if (bmap->b_ops->bop_check_insert != NULL) { + ret = (*bmap->b_ops->bop_check_insert)(bmap, key); + if (ret > 0) { + n = (*bmap->b_ops->bop_gather_data)( + bmap, keys, ptrs, NILFS_BMAP_SMALL_HIGH + 1); + if (n < 0) + return n; + ret = nilfs_btree_convert_and_insert( + bmap, key, ptr, keys, ptrs, n, + NILFS_BMAP_LARGE_LOW, NILFS_BMAP_LARGE_HIGH); + if (ret == 0) + bmap->b_u.u_flags |= NILFS_BMAP_LARGE; + + return ret; + } else if (ret < 0) + return ret; + } + + return (*bmap->b_ops->bop_insert)(bmap, key, ptr); +} + +/** + * nilfs_bmap_insert - insert a new key-record pair into a bmap + * @bmap: bmap + * @key: key + * @rec: record + * + * Description: nilfs_bmap_insert() inserts the new key-record pair specified + * by @key and @rec into @bmap. + * + * Return Value: On success, 0 is returned. On error, one of the following + * negative error codes is returned. + * + * %-EIO - I/O error. + * + * %-ENOMEM - Insufficient amount of memory available. + * + * %-EEXIST - A record associated with @key already exist. + */ +int nilfs_bmap_insert(struct nilfs_bmap *bmap, + unsigned long key, + unsigned long rec) +{ + int ret; + + down_write(&bmap->b_sem); + ret = nilfs_bmap_do_insert(bmap, key, rec); + up_write(&bmap->b_sem); + return ret; +} + +static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key) +{ + __u64 keys[NILFS_BMAP_LARGE_LOW + 1]; + __u64 ptrs[NILFS_BMAP_LARGE_LOW + 1]; + int ret, n; + + if (bmap->b_ops->bop_check_delete != NULL) { + ret = (*bmap->b_ops->bop_check_delete)(bmap, key); + if (ret > 0) { + n = (*bmap->b_ops->bop_gather_data)( + bmap, keys, ptrs, NILFS_BMAP_LARGE_LOW + 1); + if (n < 0) + return n; + ret = nilfs_direct_delete_and_convert( + bmap, key, keys, ptrs, n, + NILFS_BMAP_SMALL_LOW, NILFS_BMAP_SMALL_HIGH); + if (ret == 0) + bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE; + + return ret; + } else if (ret < 0) + return ret; + } + + return (*bmap->b_ops->bop_delete)(bmap, key); +} + +int nilfs_bmap_last_key(struct nilfs_bmap *bmap, unsigned long *key) +{ + __u64 lastkey; + int ret; + + down_read(&bmap->b_sem); + ret = (*bmap->b_ops->bop_last_key)(bmap, &lastkey); + if (!ret) + *key = lastkey; + up_read(&bmap->b_sem); + return ret; +} + +/** + * nilfs_bmap_delete - delete a key-record pair from a bmap + * @bmap: bmap + * @key: key + * + * Description: nilfs_bmap_delete() deletes the key-record pair specified by + * @key from @bmap. + * + * Return Value: On success, 0 is returned. On error, one of the following + * negative error codes is returned. + * + * %-EIO - I/O error. + * + * %-ENOMEM - Insufficient amount of memory available. + * + * %-ENOENT - A record associated with @key does not exist. + */ +int nilfs_bmap_delete(struct nilfs_bmap *bmap, unsigned long key) +{ + int ret; + + down_write(&bmap->b_sem); + ret = nilfs_bmap_do_delete(bmap, key); + up_write(&bmap->b_sem); + return ret; +} + +static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, unsigned long key) +{ + __u64 lastkey; + int ret; + + ret = (*bmap->b_ops->bop_last_key)(bmap, &lastkey); + if (ret < 0) { + if (ret == -ENOENT) + ret = 0; + return ret; + } + + while (key <= lastkey) { + ret = nilfs_bmap_do_delete(bmap, lastkey); + if (ret < 0) + return ret; + ret = (*bmap->b_ops->bop_last_key)(bmap, &lastkey); + if (ret < 0) { + if (ret == -ENOENT) + ret = 0; + return ret; + } + } + return 0; +} + +/** + * nilfs_bmap_truncate - truncate a bmap to a specified key + * @bmap: bmap + * @key: key + * + * Description: nilfs_bmap_truncate() removes key-record pairs whose keys are + * greater than or equal to @key from @bmap. + * + * Return Value: On success, 0 is returned. On error, one of the following + * negative error codes is returned. + * + * %-EIO - I/O error. + * + * %-ENOMEM - Insufficient amount of memory available. + */ +int nilfs_bmap_truncate(struct nilfs_bmap *bmap, unsigned long key) +{ + int ret; + + down_write(&bmap->b_sem); + ret = nilfs_bmap_do_truncate(bmap, key); + up_write(&bmap->b_sem); + return ret; +} + +/** + * nilfs_bmap_clear - free resources a bmap holds + * @bmap: bmap + * + * Description: nilfs_bmap_clear() frees resources associated with @bmap. + */ +void nilfs_bmap_clear(struct nilfs_bmap *bmap) +{ + down_write(&bmap->b_sem); + if (bmap->b_ops->bop_clear != NULL) + (*bmap->b_ops->bop_clear)(bmap); + up_write(&bmap->b_sem); +} + +/** + * nilfs_bmap_propagate - propagate dirty state + * @bmap: bmap + * @bh: buffer head + * + * Description: nilfs_bmap_propagate() marks the buffers that directly or + * indirectly refer to the block specified by @bh dirty. + * + * Return Value: On success, 0 is returned. On error, one of the following + * negative error codes is returned. + * + * %-EIO - I/O error. + * + * %-ENOMEM - Insufficient amount of memory available. + */ +int nilfs_bmap_propagate(struct nilfs_bmap *bmap, struct buffer_head *bh) +{ + int ret; + + down_write(&bmap->b_sem); + ret = (*bmap->b_ops->bop_propagate)(bmap, bh); + up_write(&bmap->b_sem); + return ret; +} + +/** + * nilfs_bmap_lookup_dirty_buffers - + * @bmap: bmap + * @listp: pointer to buffer head list + */ +void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *bmap, + struct list_head *listp) +{ + if (bmap->b_ops->bop_lookup_dirty_buffers != NULL) + (*bmap->b_ops->bop_lookup_dirty_buffers)(bmap, listp); +} + +/** + * nilfs_bmap_assign - assign a new block number to a block + * @bmap: bmap + * @bhp: pointer to buffer head + * @blocknr: block number + * @binfo: block information + * + * Description: nilfs_bmap_assign() assigns the block number @blocknr to the + * buffer specified by @bh. + * + * Return Value: On success, 0 is returned and the buffer head of a newly + * create buffer and the block information associated with the buffer are + * stored in the place pointed by @bh and @binfo, respectively. On error, one + * of the following negative error codes is returned. + * + * %-EIO - I/O error. + * + * %-ENOMEM - Insufficient amount of memory available. + */ +int nilfs_bmap_assign(struct nilfs_bmap *bmap, + struct buffer_head **bh, + unsigned long blocknr, + union nilfs_binfo *binfo) +{ + int ret; + + down_write(&bmap->b_sem); + ret = (*bmap->b_ops->bop_assign)(bmap, bh, blocknr, binfo); + up_write(&bmap->b_sem); + return ret; +} + +/** + * nilfs_bmap_mark - mark block dirty + * @bmap: bmap + * @key: key + * @level: level + * + * Description: nilfs_bmap_mark() marks the block specified by @key and @level + * as dirty. + * + * Return Value: On success, 0 is returned. On error, one of the following + * negative error codes is returned. + * + * %-EIO - I/O error. + * + * %-ENOMEM - Insufficient amount of memory available. + */ +int nilfs_bmap_mark(struct nilfs_bmap *bmap, __u64 key, int level) +{ + int ret; + + if (bmap->b_ops->bop_mark == NULL) + return 0; + + down_write(&bmap->b_sem); + ret = (*bmap->b_ops->bop_mark)(bmap, key, level); + up_write(&bmap->b_sem); + return ret; +} + +/** + * nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state + * @bmap: bmap + * + * Description: nilfs_test_and_clear() is the atomic operation to test and + * clear the dirty state of @bmap. + * + * Return Value: 1 is returned if @bmap is dirty, or 0 if clear. + */ +int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap) +{ + int ret; + + down_write(&bmap->b_sem); + ret = nilfs_bmap_dirty(bmap); + nilfs_bmap_clear_dirty(bmap); + up_write(&bmap->b_sem); + return ret; +} + + +/* + * Internal use only + */ + +void nilfs_bmap_add_blocks(const struct nilfs_bmap *bmap, int n) +{ + inode_add_bytes(bmap->b_inode, (1 << bmap->b_inode->i_blkbits) * n); + if (NILFS_MDT(bmap->b_inode)) + nilfs_mdt_mark_dirty(bmap->b_inode); + else + mark_inode_dirty(bmap->b_inode); +} + +void nilfs_bmap_sub_blocks(const struct nilfs_bmap *bmap, int n) +{ + inode_sub_bytes(bmap->b_inode, (1 << bmap->b_inode->i_blkbits) * n); + if (NILFS_MDT(bmap->b_inode)) + nilfs_mdt_mark_dirty(bmap->b_inode); + else + mark_inode_dirty(bmap->b_inode); +} + +int nilfs_bmap_get_block(const struct nilfs_bmap *bmap, __u64 ptr, + struct buffer_head **bhp) +{ + return nilfs_btnode_get(&NILFS_BMAP_I(bmap)->i_btnode_cache, + ptr, 0, bhp, 0); +} + +void nilfs_bmap_put_block(const struct nilfs_bmap *bmap, + struct buffer_head *bh) +{ + brelse(bh); +} + +int nilfs_bmap_get_new_block(const struct nilfs_bmap *bmap, __u64 ptr, + struct buffer_head **bhp) +{ + int ret; + + ret = nilfs_btnode_get(&NILFS_BMAP_I(bmap)->i_btnode_cache, + ptr, 0, bhp, 1); + if (ret < 0) + return ret; + set_buffer_nilfs_volatile(*bhp); + return 0; +} + +void nilfs_bmap_delete_block(const struct nilfs_bmap *bmap, + struct buffer_head *bh) +{ + nilfs_btnode_delete(bh); +} + +__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap, + const struct buffer_head *bh) +{ + struct buffer_head *pbh; + __u64 key; + + key = page_index(bh->b_page) << (PAGE_CACHE_SHIFT - + bmap->b_inode->i_blkbits); + for (pbh = page_buffers(bh->b_page); pbh != bh; + pbh = pbh->b_this_page, key++); + + return key; +} + +__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *bmap, __u64 key) +{ + __s64 diff; + + diff = key - bmap->b_last_allocated_key; + if ((nilfs_bmap_keydiff_abs(diff) < NILFS_INODE_BMAP_SIZE) && + (bmap->b_last_allocated_ptr != NILFS_BMAP_INVALID_PTR) && + (bmap->b_last_allocated_ptr + diff > 0)) + return bmap->b_last_allocated_ptr + diff; + else + return NILFS_BMAP_INVALID_PTR; +} + +static struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap) +{ + return nilfs_dat_inode(NILFS_I_NILFS(bmap->b_inode)); +} + +#define NILFS_BMAP_GROUP_DIV 8 +__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *bmap) +{ + struct inode *dat = nilfs_bmap_get_dat(bmap); + unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat); + unsigned long group = bmap->b_inode->i_ino / entries_per_group; + + return group * entries_per_group + + (bmap->b_inode->i_ino % NILFS_BMAP_GROUP_DIV) * + (entries_per_group / NILFS_BMAP_GROUP_DIV); +} + +static int nilfs_bmap_prepare_alloc_v(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + return nilfs_dat_prepare_alloc(nilfs_bmap_get_dat(bmap), &req->bpr_req); +} + +static void nilfs_bmap_commit_alloc_v(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + nilfs_dat_commit_alloc(nilfs_bmap_get_dat(bmap), &req->bpr_req); +} + +static void nilfs_bmap_abort_alloc_v(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + nilfs_dat_abort_alloc(nilfs_bmap_get_dat(bmap), &req->bpr_req); +} + +static int nilfs_bmap_prepare_start_v(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + return nilfs_dat_prepare_start(nilfs_bmap_get_dat(bmap), &req->bpr_req); +} + +static void nilfs_bmap_commit_start_v(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req, + sector_t blocknr) +{ + nilfs_dat_commit_start(nilfs_bmap_get_dat(bmap), &req->bpr_req, + blocknr); +} + +static void nilfs_bmap_abort_start_v(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + nilfs_dat_abort_start(nilfs_bmap_get_dat(bmap), &req->bpr_req); +} + +static int nilfs_bmap_prepare_end_v(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + return nilfs_dat_prepare_end(nilfs_bmap_get_dat(bmap), &req->bpr_req); +} + +static void nilfs_bmap_commit_end_v(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + nilfs_dat_commit_end(nilfs_bmap_get_dat(bmap), &req->bpr_req, 0); +} + +static void nilfs_bmap_commit_end_vmdt(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + nilfs_dat_commit_end(nilfs_bmap_get_dat(bmap), &req->bpr_req, 1); +} + +static void nilfs_bmap_abort_end_v(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + nilfs_dat_abort_end(nilfs_bmap_get_dat(bmap), &req->bpr_req); +} + +int nilfs_bmap_move_v(const struct nilfs_bmap *bmap, __u64 vblocknr, + sector_t blocknr) +{ + return nilfs_dat_move(nilfs_bmap_get_dat(bmap), vblocknr, blocknr); +} + +int nilfs_bmap_mark_dirty(const struct nilfs_bmap *bmap, __u64 vblocknr) +{ + return nilfs_dat_mark_dirty(nilfs_bmap_get_dat(bmap), vblocknr); +} + +int nilfs_bmap_prepare_update(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *oldreq, + union nilfs_bmap_ptr_req *newreq) +{ + int ret; + + ret = (*bmap->b_pops->bpop_prepare_end_ptr)(bmap, oldreq); + if (ret < 0) + return ret; + ret = (*bmap->b_pops->bpop_prepare_alloc_ptr)(bmap, newreq); + if (ret < 0) + (*bmap->b_pops->bpop_abort_end_ptr)(bmap, oldreq); + + return ret; +} + +void nilfs_bmap_commit_update(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *oldreq, + union nilfs_bmap_ptr_req *newreq) +{ + (*bmap->b_pops->bpop_commit_end_ptr)(bmap, oldreq); + (*bmap->b_pops->bpop_commit_alloc_ptr)(bmap, newreq); +} + +void nilfs_bmap_abort_update(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *oldreq, + union nilfs_bmap_ptr_req *newreq) +{ + (*bmap->b_pops->bpop_abort_end_ptr)(bmap, oldreq); + (*bmap->b_pops->bpop_abort_alloc_ptr)(bmap, newreq); +} + +static int nilfs_bmap_translate_v(const struct nilfs_bmap *bmap, __u64 ptr, + __u64 *ptrp) +{ + sector_t blocknr; + int ret; + + ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), ptr, &blocknr); + if (ret < 0) + return ret; + if (ptrp != NULL) + *ptrp = blocknr; + return 0; +} + +static int nilfs_bmap_prepare_alloc_p(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + /* ignore target ptr */ + req->bpr_ptr = bmap->b_last_allocated_ptr++; + return 0; +} + +static void nilfs_bmap_commit_alloc_p(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + /* do nothing */ +} + +static void nilfs_bmap_abort_alloc_p(struct nilfs_bmap *bmap, + union nilfs_bmap_ptr_req *req) +{ + bmap->b_last_allocated_ptr--; +} + +static const struct nilfs_bmap_ptr_operations nilfs_bmap_ptr_ops_v = { + .bpop_prepare_alloc_ptr = nilfs_bmap_prepare_alloc_v, + .bpop_commit_alloc_ptr = nilfs_bmap_commit_alloc_v, + .bpop_abort_alloc_ptr = nilfs_bmap_abort_alloc_v, + .bpop_prepare_start_ptr = nilfs_bmap_prepare_start_v, + .bpop_commit_start_ptr = nilfs_bmap_commit_start_v, + .bpop_abort_start_ptr = nilfs_bmap_abort_start_v, + .bpop_prepare_end_ptr = nilfs_bmap_prepare_end_v, + .bpop_commit_end_ptr = nilfs_bmap_commit_end_v, + .bpop_abort_end_ptr = nilfs_bmap_abort_end_v, + + .bpop_translate = nilfs_bmap_translate_v, +}; + +static const struct nilfs_bmap_ptr_operations nilfs_bmap_ptr_ops_vmdt = { + .bpop_prepare_alloc_ptr = nilfs_bmap_prepare_alloc_v, + .bpop_commit_alloc_ptr = nilfs_bmap_commit_alloc_v, + .bpop_abort_alloc_ptr = nilfs_bmap_abort_alloc_v, + .bpop_prepare_start_ptr = nilfs_bmap_prepare_start_v, + .bpop_commit_start_ptr = nilfs_bmap_commit_start_v, + .bpop_abort_start_ptr = nilfs_bmap_abort_start_v, + .bpop_prepare_end_ptr = nilfs_bmap_prepare_end_v, + .bpop_commit_end_ptr = nilfs_bmap_commit_end_vmdt, + .bpop_abort_end_ptr = nilfs_bmap_abort_end_v, + + .bpop_translate = nilfs_bmap_translate_v, +}; + +static const struct nilfs_bmap_ptr_operations nilfs_bmap_ptr_ops_p = { + .bpop_prepare_alloc_ptr = nilfs_bmap_prepare_alloc_p, + .bpop_commit_alloc_ptr = nilfs_bmap_commit_alloc_p, + .bpop_abort_alloc_ptr = nilfs_bmap_abort_alloc_p, + .bpop_prepare_start_ptr = NULL, + .bpop_commit_start_ptr = NULL, + .bpop_abort_start_ptr = NULL, + .bpop_prepare_end_ptr = NULL, + .bpop_commit_end_ptr = NULL, + .bpop_abort_end_ptr = NULL, + + .bpop_translate = NULL, +}; + +static const struct nilfs_bmap_ptr_operations nilfs_bmap_ptr_ops_gc = { + .bpop_prepare_alloc_ptr = NULL, + .bpop_commit_alloc_ptr = NULL, + .bpop_abort_alloc_ptr = NULL, + .bpop_prepare_start_ptr = NULL, + .bpop_commit_start_ptr = NULL, + .bpop_abort_start_ptr = NULL, + .bpop_prepare_end_ptr = NULL, + .bpop_commit_end_ptr = NULL, + .bpop_abort_end_ptr = NULL, + + .bpop_translate = NULL, +}; + +/** + * nilfs_bmap_read - read a bmap from an inode + * @bmap: bmap + * @raw_inode: on-disk inode + * + * Description: nilfs_bmap_read() initializes the bmap @bmap. + * + * Return Value: On success, 0 is returned. On error, the following negative + * error code is returned. + * + * %-ENOMEM - Insufficient amount of memory available. + */ +int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode) +{ + if (raw_inode == NULL) + memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE); + else + memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE); + + init_rwsem(&bmap->b_sem); + bmap->b_state = 0; + bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode; + switch (bmap->b_inode->i_ino) { + case NILFS_DAT_INO: + bmap->b_pops = &nilfs_bmap_ptr_ops_p; + bmap->b_last_allocated_key = 0; /* XXX: use macro */ + bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT; + break; + case NILFS_CPFILE_INO: + case NILFS_SUFILE_INO: + bmap->b_pops = &nilfs_bmap_ptr_ops_vmdt; + bmap->b_last_allocated_key = 0; /* XXX: use macro */ + bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR; + break; + default: + bmap->b_pops = &nilfs_bmap_ptr_ops_v; + bmap->b_last_allocated_key = 0; /* XXX: use macro */ + bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR; + break; + } + + return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ? + nilfs_btree_init(bmap, + NILFS_BMAP_LARGE_LOW, + NILFS_BMAP_LARGE_HIGH) : + nilfs_direct_init(bmap, + NILFS_BMAP_SMALL_LOW, + NILFS_BMAP_SMALL_HIGH); +} + +/** + * nilfs_bmap_write - write back a bmap to an inode + * @bmap: bmap + * @raw_inode: on-disk inode + * + * Description: nilfs_bmap_write() stores @bmap in @raw_inode. + */ +void nilfs_bmap_write(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode) +{ + down_write(&bmap->b_sem); + memcpy(raw_inode->i_bmap, bmap->b_u.u_data, + NILFS_INODE_BMAP_SIZE * sizeof(__le64)); + if (bmap->b_inode->i_ino == NILFS_DAT_INO) + bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT; + + up_write(&bmap->b_sem); +} + +void nilfs_bmap_init_gc(struct nilfs_bmap *bmap) +{ + memset(&bmap->b_u, 0, NILFS_BMAP_SIZE); + init_rwsem(&bmap->b_sem); + bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode; + bmap->b_pops = &nilfs_bmap_ptr_ops_gc; + bmap->b_last_allocated_key = 0; + bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR; + bmap->b_state = 0; + nilfs_btree_init_gc(bmap); +} + +void nilfs_bmap_init_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap) +{ + memcpy(gcbmap, bmap, sizeof(union nilfs_bmap_union)); + init_rwsem(&gcbmap->b_sem); + gcbmap->b_inode = &NILFS_BMAP_I(gcbmap)->vfs_inode; +} + +void nilfs_bmap_commit_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap) +{ + memcpy(bmap, gcbmap, sizeof(union nilfs_bmap_union)); + init_rwsem(&bmap->b_sem); + bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode; +} diff --git a/fs/nilfs2/bmap.h b/fs/nilfs2/bmap.h new file mode 100644 index 000000000000..4f2708abb1ba --- /dev/null +++ b/fs/nilfs2/bmap.h @@ -0,0 +1,244 @@ +/* + * bmap.h - NILFS block mapping. + * + * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Written by Koji Sato <koji@osrg.net>. + */ + +#ifndef _NILFS_BMAP_H +#define _NILFS_BMAP_H + +#include <linux/types.h> +#include <linux/fs.h> +#include <linux/buffer_head.h> +#include <linux/nilfs2_fs.h> +#include "alloc.h" + +#define NILFS_BMAP_INVALID_PTR 0 + +#define nilfs_bmap_dkey_to_key(dkey) le64_to_cpu(dkey) +#define nilfs_bmap_key_to_dkey(key) cpu_to_le64(key) +#define nilfs_bmap_dptr_to_ptr(dptr) le64_to_cpu(dptr) +#define nilfs_bmap_ptr_to_dptr(ptr) cpu_to_le64(ptr) + +#define nilfs_bmap_keydiff_abs(diff) ((diff) < 0 ? -(diff) : (diff)) + + +struct nilfs_bmap; + +/** + * union nilfs_bmap_ptr_req - request for bmap ptr + * @bpr_ptr: bmap pointer + * @bpr_req: request for persistent allocator + */ +union nilfs_bmap_ptr_req { + __u64 bpr_ptr; + struct nilfs_palloc_req bpr_req; +}; + +/** + * struct nilfs_bmap_stats - bmap statistics + * @bs_nblocks: number of blocks created or deleted + */ +struct nilfs_bmap_stats { + unsigned int bs_nblocks; +}; + +/** + * struct nilfs_bmap_operations - bmap operation table + */ +struct nilfs_bmap_operations { + int (*bop_lookup)(const struct nilfs_bmap *, __u64, int, __u64 *); + int (*bop_insert)(struct nilfs_bmap *, __u64, __u64); + int (*bop_delete)(struct nilfs_bmap *, __u64); + void (*bop_clear)(struct nilfs_bmap *); + + int (*bop_propagate)(const struct nilfs_bmap *, struct buffer_head *); + void (*bop_lookup_dirty_buffers)(struct nilfs_bmap *, + struct list_head *); + + int (*bop_assign)(struct nilfs_bmap *, + struct buffer_head **, + sector_t, + union nilfs_binfo *); + int (*bop_mark)(struct nilfs_bmap *, __u64, int); + + /* The following functions are internal use only. */ + int (*bop_last_key)(const struct nilfs_bmap *, __u64 *); + int (*bop_check_insert)(const struct nilfs_bmap *, __u64); + int (*bop_check_delete)(struct nilfs_bmap *, __u64); + int (*bop_gather_data)(struct nilfs_bmap *, __u64 *, __u64 *, int); +}; + + +/** + * struct nilfs_bmap_ptr_operations - bmap ptr operation table + */ +struct nilfs_bmap_ptr_operations { + int (*bpop_prepare_alloc_ptr)(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *); + void (*bpop_commit_alloc_ptr)(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *); + void (*bpop_abort_alloc_ptr)(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *); + int (*bpop_prepare_start_ptr)(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *); + void (*bpop_commit_start_ptr)(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *, + sector_t); + void (*bpop_abort_start_ptr)(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *); + int (*bpop_prepare_end_ptr)(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *); + void (*bpop_commit_end_ptr)(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *); + void (*bpop_abort_end_ptr)(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *); + + int (*bpop_translate)(const struct nilfs_bmap *, __u64, __u64 *); +}; + + +#define NILFS_BMAP_SIZE (NILFS_INODE_BMAP_SIZE * sizeof(__le64)) +#define NILFS_BMAP_KEY_BIT (sizeof(unsigned long) * 8 /* CHAR_BIT */) +#define NILFS_BMAP_NEW_PTR_INIT \ + (1UL << (sizeof(unsigned long) * 8 /* CHAR_BIT */ - 1)) + +static inline int nilfs_bmap_is_new_ptr(unsigned long ptr) +{ + return !!(ptr & NILFS_BMAP_NEW_PTR_INIT); +} + + +/** + * struct nilfs_bmap - bmap structure + * @b_u: raw data + * @b_sem: semaphore + * @b_inode: owner of bmap + * @b_ops: bmap operation table + * @b_pops: bmap ptr operation table + * @b_low: low watermark of conversion + * @b_high: high watermark of conversion + * @b_last_allocated_key: last allocated key for data block + * @b_last_allocated_ptr: last allocated ptr for data block + * @b_state: state + */ +struct nilfs_bmap { + union { + __u8 u_flags; + __le64 u_data[NILFS_BMAP_SIZE / sizeof(__le64)]; + } b_u; + struct rw_semaphore b_sem; + struct inode *b_inode; + const struct nilfs_bmap_operations *b_ops; + const struct nilfs_bmap_ptr_operations *b_pops; + __u64 b_low; + __u64 b_high; + __u64 b_last_allocated_key; + __u64 b_last_allocated_ptr; + int b_state; +}; + +/* state */ +#define NILFS_BMAP_DIRTY 0x00000001 + + +int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *); +int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *); +void nilfs_bmap_write(struct nilfs_bmap *, struct nilfs_inode *); +int nilfs_bmap_lookup(struct nilfs_bmap *, unsigned long, unsigned long *); +int nilfs_bmap_insert(struct nilfs_bmap *, unsigned long, unsigned long); +int nilfs_bmap_delete(struct nilfs_bmap *, unsigned long); +int nilfs_bmap_last_key(struct nilfs_bmap *, unsigned long *); +int nilfs_bmap_truncate(struct nilfs_bmap *, unsigned long); +void nilfs_bmap_clear(struct nilfs_bmap *); +int nilfs_bmap_propagate(struct nilfs_bmap *, struct buffer_head *); +void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *, struct list_head *); +int nilfs_bmap_assign(struct nilfs_bmap *, struct buffer_head **, + unsigned long, union nilfs_binfo *); +int nilfs_bmap_lookup_at_level(struct nilfs_bmap *, __u64, int, __u64 *); +int nilfs_bmap_mark(struct nilfs_bmap *, __u64, int); + +void nilfs_bmap_init_gc(struct nilfs_bmap *); +void nilfs_bmap_init_gcdat(struct nilfs_bmap *, struct nilfs_bmap *); +void nilfs_bmap_commit_gcdat(struct nilfs_bmap *, struct nilfs_bmap *); + + +/* + * Internal use only + */ + +int nilfs_bmap_move_v(const struct nilfs_bmap *, __u64, sector_t); +int nilfs_bmap_mark_dirty(const struct nilfs_bmap *, __u64); + + +__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *, + const struct buffer_head *); + +__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *, __u64); +__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *); + +int nilfs_bmap_prepare_update(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *, + union nilfs_bmap_ptr_req *); +void nilfs_bmap_commit_update(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *, + union nilfs_bmap_ptr_req *); +void nilfs_bmap_abort_update(struct nilfs_bmap *, + union nilfs_bmap_ptr_req *, + union nilfs_bmap_ptr_req *); + +void nilfs_bmap_add_blocks(const struct nilfs_bmap *, int); +void nilfs_bmap_sub_blocks(const struct nilfs_bmap *, int); + + +int nilfs_bmap_get_block(const struct nilfs_bmap *, __u64, + struct buffer_head **); +void nilfs_bmap_put_block(const struct nilfs_bmap *, struct buffer_head *); +int nilfs_bmap_get_new_block(const struct nilfs_bmap *, __u64, + struct buffer_head **); +void nilfs_bmap_delete_block(const struct nilfs_bmap *, struct buffer_head *); + + +/* Assume that bmap semaphore is locked. */ +static inline int nilfs_bmap_dirty(const struct nilfs_bmap *bmap) +{ + return !!(bmap->b_state & NILFS_BMAP_DIRTY); +} + +/* Assume that bmap semaphore is locked. */ +static inline void nilfs_bmap_set_dirty(struct nilfs_bmap *bmap) +{ + bmap->b_state |= NILFS_BMAP_DIRTY; +} + +/* Assume that bmap semaphore is locked. */ +static inline void nilfs_bmap_clear_dirty(struct nilfs_bmap *bmap) +{ + bmap->b_state &= ~NILFS_BMAP_DIRTY; +} + + +#define NILFS_BMAP_LARGE 0x1 + +#define NILFS_BMAP_SMALL_LOW NILFS_DIRECT_KEY_MIN +#define NILFS_BMAP_SMALL_HIGH NILFS_DIRECT_KEY_MAX +#define NILFS_BMAP_LARGE_LOW NILFS_BTREE_ROOT_NCHILDREN_MAX +#define NILFS_BMAP_LARGE_HIGH NILFS_BTREE_KEY_MAX + +#endif /* _NILFS_BMAP_H */ diff --git a/fs/nilfs2/bmap_union.h b/fs/nilfs2/bmap_union.h new file mode 100644 index 000000000000..d41509bff47b --- /dev/null +++ b/fs/nilfs2/bmap_union.h @@ -0,0 +1,42 @@ +/* + * bmap_union.h - NILFS block mapping. + * + * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Written by Koji Sato <koji@osrg.net>. + */ + +#ifndef _NILFS_BMAP_UNION_H +#define _NILFS_BMAP_UNION_H + +#include "bmap.h" +#include "direct.h" +#include "btree.h" + +/** + * nilfs_bmap_union - + * @bi_bmap: bmap structure + * @bi_btree: direct map structure + * @bi_direct: B-tree structure + */ +union nilfs_bmap_union { + struct nilfs_bmap bi_bmap; + struct nilfs_direct bi_direct; + struct nilfs_btree bi_btree; +}; + +#endif /* _NILFS_BMAP_UNION_H */ |
