| /* |
| * 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. |
| * |
| * 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 "btree.h" |
| #include "direct.h" |
| #include "btnode.h" |
| #include "mdt.h" |
| #include "dat.h" |
| #include "alloc.h" |
| |
| struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap) |
| { |
| struct the_nilfs *nilfs = bmap->b_inode->i_sb->s_fs_info; |
| |
| return nilfs->ns_dat; |
| } |
| |
| static int nilfs_bmap_convert_error(struct nilfs_bmap *bmap, |
| const char *fname, int err) |
| { |
| struct inode *inode = bmap->b_inode; |
| |
| if (err == -EINVAL) { |
| nilfs_error(inode->i_sb, fname, |
| "broken bmap (inode number=%lu)\n", inode->i_ino); |
| err = -EIO; |
| } |
| return err; |
| } |
| |
| /** |
| * nilfs_bmap_lookup_at_level - find a data block or node block |
| * @bmap: bmap |
| * @key: key |
| * @level: level |
| * @ptrp: place to store the value associated to @key |
| * |
| * Description: nilfs_bmap_lookup_at_level() finds a record whose key |
| * matches @key in the block at @level of the bmap. |
| * |
| * Return Value: On success, 0 is returned and the record associated with @key |
| * is stored in the place pointed by @ptrp. 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_at_level(struct nilfs_bmap *bmap, __u64 key, int level, |
| __u64 *ptrp) |
| { |
| sector_t blocknr; |
| int ret; |
| |
| down_read(&bmap->b_sem); |
| ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp); |
| if (ret < 0) { |
| ret = nilfs_bmap_convert_error(bmap, __func__, ret); |
| goto out; |
| } |
| if (NILFS_BMAP_USE_VBN(bmap)) { |
| ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp, |
| &blocknr); |
| if (!ret) |
| *ptrp = blocknr; |
| } |
| |
| out: |
| up_read(&bmap->b_sem); |
| return ret; |
| } |
| |
| int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp, |
| unsigned maxblocks) |
| { |
| int ret; |
| |
| down_read(&bmap->b_sem); |
| ret = bmap->b_ops->bop_lookup_contig(bmap, key, ptrp, maxblocks); |
| up_read(&bmap->b_sem); |
| |
| return nilfs_bmap_convert_error(bmap, __func__, 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); |
| 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, __u64 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 nilfs_bmap_convert_error(bmap, __func__, 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); |
| 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); |
| } |
| |
| /** |
| * nilfs_bmap_seek_key - seek a valid entry and return its key |
| * @bmap: bmap struct |
| * @start: start key number |
| * @keyp: place to store valid key |
| * |
| * Description: nilfs_bmap_seek_key() seeks a valid key on @bmap |
| * starting from @start, and stores it to @keyp if found. |
| * |
| * 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 - No valid entry was found |
| */ |
| int nilfs_bmap_seek_key(struct nilfs_bmap *bmap, __u64 start, __u64 *keyp) |
| { |
| int ret; |
| |
| down_read(&bmap->b_sem); |
| ret = bmap->b_ops->bop_seek_key(bmap, start, keyp); |
| up_read(&bmap->b_sem); |
| |
| if (ret < 0) |
| ret = nilfs_bmap_convert_error(bmap, __func__, ret); |
| return ret; |
| } |
| |
| int nilfs_bmap_last_key(struct nilfs_bmap *bmap, __u64 *keyp) |
| { |
| int ret; |
| |
| down_read(&bmap->b_sem); |
| ret = bmap->b_ops->bop_last_key(bmap, keyp); |
| up_read(&bmap->b_sem); |
| |
| if (ret < 0) |
| ret = nilfs_bmap_convert_error(bmap, __func__, ret); |
| 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, __u64 key) |
| { |
| int ret; |
| |
| down_write(&bmap->b_sem); |
| ret = nilfs_bmap_do_delete(bmap, key); |
| up_write(&bmap->b_sem); |
| |
| return nilfs_bmap_convert_error(bmap, __func__, ret); |
| } |
| |
| static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, __u64 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, __u64 key) |
| { |
| int ret; |
| |
| down_write(&bmap->b_sem); |
| ret = nilfs_bmap_do_truncate(bmap, key); |
| up_write(&bmap->b_sem); |
| |
| return nilfs_bmap_convert_error(bmap, __func__, 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 nilfs_bmap_convert_error(bmap, __func__, 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 nilfs_bmap_convert_error(bmap, __func__, 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 nilfs_bmap_convert_error(bmap, __func__, 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 |
| */ |
| __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_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; |
| } |
| |
| #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 struct lock_class_key nilfs_bmap_dat_lock_key; |
| static struct lock_class_key nilfs_bmap_mdt_lock_key; |
| |
| /** |
| * 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_ptr_type = NILFS_BMAP_PTR_P; |
| bmap->b_last_allocated_key = 0; |
| bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT; |
| lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key); |
| break; |
| case NILFS_CPFILE_INO: |
| case NILFS_SUFILE_INO: |
| bmap->b_ptr_type = NILFS_BMAP_PTR_VS; |
| bmap->b_last_allocated_key = 0; |
| bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR; |
| lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key); |
| break; |
| case NILFS_IFILE_INO: |
| lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key); |
| /* Fall through */ |
| default: |
| bmap->b_ptr_type = NILFS_BMAP_PTR_VM; |
| bmap->b_last_allocated_key = 0; |
| bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR; |
| break; |
| } |
| |
| return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ? |
| nilfs_btree_init(bmap) : nilfs_direct_init(bmap); |
| } |
| |
| /** |
| * 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_ptr_type = NILFS_BMAP_PTR_U; |
| 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_save(const struct nilfs_bmap *bmap, |
| struct nilfs_bmap_store *store) |
| { |
| memcpy(store->data, bmap->b_u.u_data, sizeof(store->data)); |
| store->last_allocated_key = bmap->b_last_allocated_key; |
| store->last_allocated_ptr = bmap->b_last_allocated_ptr; |
| store->state = bmap->b_state; |
| } |
| |
| void nilfs_bmap_restore(struct nilfs_bmap *bmap, |
| const struct nilfs_bmap_store *store) |
| { |
| memcpy(bmap->b_u.u_data, store->data, sizeof(store->data)); |
| bmap->b_last_allocated_key = store->last_allocated_key; |
| bmap->b_last_allocated_ptr = store->last_allocated_ptr; |
| bmap->b_state = store->state; |
| } |