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authorColy Li <i@coly.li>2011-02-24 13:24:25 -0500
committerTheodore Ts'o <tytso@mit.edu>2011-02-24 13:24:25 -0500
commit7c786059293335412f99732c6f4c2a886eab25c2 (patch)
treebd241fdfd00e197b9efe0d2b4cd373cef1e14d39 /fs/ext4
parent235772da3e2adb1f4d71f27ec5475093dd38b2ac (diff)
downloadop-kernel-dev-7c786059293335412f99732c6f4c2a886eab25c2.zip
op-kernel-dev-7c786059293335412f99732c6f4c2a886eab25c2.tar.gz
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')
-rw-r--r--fs/ext4/mballoc.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 7de0e28..b5235c8 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)
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