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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>
This commit is contained in:
Coly Li 2011-02-24 13:24:25 -05:00 committed by Theodore Ts'o
parent 235772da3e
commit 7c78605929
1 changed files with 6 additions and 1 deletions
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7
fs/ext4/mballoc.c
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@ -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)