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author | Alex Tomas <alex@clusterfs.com> | 2008-01-29 04:58:27 (GMT) |
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committer | Theodore Ts'o <tytso@mit.edu> | 2008-01-29 04:58:27 (GMT) |
commit | 1988b51e476bd097d910c9245b53f2e38aedaf0d (patch) | |
tree | a36b860ac1a49b359d6dc5fd7af9916cf034cac8 /fs/ext4 | |
parent | aa02ad67d9b308290fde390682cd039b29f7ab85 (diff) | |
download | linux-1988b51e476bd097d910c9245b53f2e38aedaf0d.tar.xz |
ext4: Add new functions for searching extent tree
Add the functions ext4_ext_search_left() and ext4_ext_search_right(),
which are used by mballoc during ext4_ext_get_blocks to decided whether
to merge extent information.
Signed-off-by: Alex Tomas <alex@clusterfs.com>
Signed-off-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Johann Lombardi <johann@clusterfs.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r-- | fs/ext4/extents.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 01eda5c..f5cf2a9 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -1017,6 +1017,148 @@ out: } /* + * search the closest allocated block to the left for *logical + * and returns it at @logical + it's physical address at @phys + * if *logical is the smallest allocated block, the function + * returns 0 at @phys + * return value contains 0 (success) or error code + */ +int +ext4_ext_search_left(struct inode *inode, struct ext4_ext_path *path, + ext4_lblk_t *logical, ext4_fsblk_t *phys) +{ + struct ext4_extent_idx *ix; + struct ext4_extent *ex; + int depth; + + BUG_ON(path == NULL); + depth = path->p_depth; + *phys = 0; + + if (depth == 0 && path->p_ext == NULL) + return 0; + + /* usually extent in the path covers blocks smaller + * then *logical, but it can be that extent is the + * first one in the file */ + + ex = path[depth].p_ext; + if (*logical < le32_to_cpu(ex->ee_block)) { + BUG_ON(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex); + while (--depth >= 0) { + ix = path[depth].p_idx; + BUG_ON(ix != EXT_FIRST_INDEX(path[depth].p_hdr)); + } + return 0; + } + + BUG_ON(*logical < le32_to_cpu(ex->ee_block) + le16_to_cpu(ex->ee_len)); + + *logical = le32_to_cpu(ex->ee_block) + le16_to_cpu(ex->ee_len) - 1; + *phys = ext_pblock(ex) + le16_to_cpu(ex->ee_len) - 1; + return 0; +} + +/* + * search the closest allocated block to the right for *logical + * and returns it at @logical + it's physical address at @phys + * if *logical is the smallest allocated block, the function + * returns 0 at @phys + * return value contains 0 (success) or error code + */ +int +ext4_ext_search_right(struct inode *inode, struct ext4_ext_path *path, + ext4_lblk_t *logical, ext4_fsblk_t *phys) +{ + struct buffer_head *bh = NULL; + struct ext4_extent_header *eh; + struct ext4_extent_idx *ix; + struct ext4_extent *ex; + ext4_fsblk_t block; + int depth; + + BUG_ON(path == NULL); + depth = path->p_depth; + *phys = 0; + + if (depth == 0 && path->p_ext == NULL) + return 0; + + /* usually extent in the path covers blocks smaller + * then *logical, but it can be that extent is the + * first one in the file */ + + ex = path[depth].p_ext; + if (*logical < le32_to_cpu(ex->ee_block)) { + BUG_ON(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex); + while (--depth >= 0) { + ix = path[depth].p_idx; + BUG_ON(ix != EXT_FIRST_INDEX(path[depth].p_hdr)); + } + *logical = le32_to_cpu(ex->ee_block); + *phys = ext_pblock(ex); + return 0; + } + + BUG_ON(*logical < le32_to_cpu(ex->ee_block) + le16_to_cpu(ex->ee_len)); + + if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) { + /* next allocated block in this leaf */ + ex++; + *logical = le32_to_cpu(ex->ee_block); + *phys = ext_pblock(ex); + return 0; + } + + /* go up and search for index to the right */ + while (--depth >= 0) { + ix = path[depth].p_idx; + if (ix != EXT_LAST_INDEX(path[depth].p_hdr)) + break; + } + + if (depth < 0) { + /* we've gone up to the root and + * found no index to the right */ + return 0; + } + + /* we've found index to the right, let's + * follow it and find the closest allocated + * block to the right */ + ix++; + block = idx_pblock(ix); + while (++depth < path->p_depth) { + bh = sb_bread(inode->i_sb, block); + if (bh == NULL) + return -EIO; + eh = ext_block_hdr(bh); + if (ext4_ext_check_header(inode, eh, depth)) { + put_bh(bh); + return -EIO; + } + ix = EXT_FIRST_INDEX(eh); + block = idx_pblock(ix); + put_bh(bh); + } + + bh = sb_bread(inode->i_sb, block); + if (bh == NULL) + return -EIO; + eh = ext_block_hdr(bh); + if (ext4_ext_check_header(inode, eh, path->p_depth - depth)) { + put_bh(bh); + return -EIO; + } + ex = EXT_FIRST_EXTENT(eh); + *logical = le32_to_cpu(ex->ee_block); + *phys = ext_pblock(ex); + put_bh(bh); + return 0; + +} + +/* * ext4_ext_next_allocated_block: * returns allocated block in subsequent extent or EXT_MAX_BLOCK. * NOTE: it considers block number from index entry as |