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| author | Lukas Czerner <lczerner@redhat.com> | 2013-04-03 23:32:34 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-04-03 23:32:34 -0400 |
| commit | bd86298e60b84b5e6d2da3e75c4ce2f6b70bdeed (patch) | |
| tree | 8da632bbc3acfcc7e7416da820de87d56f2168a4 /fs/ext4/ext4.h | |
| parent | 689110098c7df10fab8800d3bf8e727c21f426fb (diff) | |
| download | lwn-bd86298e60b84b5e6d2da3e75c4ce2f6b70bdeed.tar.gz lwn-bd86298e60b84b5e6d2da3e75c4ce2f6b70bdeed.zip | |
ext4: introduce ext4_get_group_number()
Currently on many places in ext4 we're using
ext4_get_group_no_and_offset() even though we're only interested in
knowing the block group of the particular block, not the offset within
the block group so we can use more efficient way to compute block
group.
This patch introduces ext4_get_group_number() which computes block
group for a given block much more efficiently. Use this function
instead of ext4_get_group_no_and_offset() everywhere where we're only
interested in knowing the block group.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index cc58aa8e9869..a0637e5057ae 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1793,9 +1793,6 @@ ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) */ #define ERR_BAD_DX_DIR -75000 -void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, - ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); - /* * Timeout and state flag for lazy initialization inode thread. */ @@ -1917,6 +1914,13 @@ int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, struct buffer_head *bh); /* balloc.c */ +extern void ext4_get_group_no_and_offset(struct super_block *sb, + ext4_fsblk_t blocknr, + ext4_group_t *blockgrpp, + ext4_grpblk_t *offsetp); +extern ext4_group_t ext4_get_group_number(struct super_block *sb, + ext4_fsblk_t block); + extern void ext4_validate_block_bitmap(struct super_block *sb, struct ext4_group_desc *desc, unsigned int block_group, |