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| author | Coly Li <i@coly.li> | 2011-02-24 21:24:25 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-02-24 21:24:25 +0300 |
| commit | 7c786059293335412f99732c6f4c2a886eab25c2 (patch) | |
| tree | bd241fdfd00e197b9efe0d2b4cd373cef1e14d39 /fs/ext4/mballoc.c | |
| parent | 235772da3e2adb1f4d71f27ec5475093dd38b2ac (diff) | |
| download | linux-7c786059293335412f99732c6f4c2a886eab25c2.tar.xz | |
mballoc: add comments to ext4_mb_mark_free_simple()
This patch adds comments to ext4_mb_mark_free_simple to make it more
understandable.
Signed-off-by: Coly Li <bosong.ly@taobao.com>
Cc: Alex Tomas <alex@clusterfs.com>
Cc: Theodore Tso <tytso@google.com>
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 7de0e2824436..b5235c8a2e78 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -635,7 +635,12 @@ static int __mb_check_buddy(struct ext4_buddy *e4b, char *file, #define mb_check_buddy(e4b) #endif -/* FIXME!! need more doc */ +/* + * Divide blocks started from @first with length @len into + * smaller chunks with power of 2 blocks. + * Clear the bits in bitmap which the blocks of the chunk(s) covered, + * then increase bb_counters[] for corresponded chunk size. + */ static void ext4_mb_mark_free_simple(struct super_block *sb, void *buddy, ext4_grpblk_t first, ext4_grpblk_t len, struct ext4_group_info *grp) |