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>
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1 changed files with 6 additions and 1 deletions
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@ -635,7 +635,12 @@ static int __mb_check_buddy(struct ext4_buddy *e4b, char *file,
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#define mb_check_buddy(e4b)
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#endif
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/* FIXME!! need more doc */
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/*
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* Divide blocks started from @first with length @len into
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* smaller chunks with power of 2 blocks.
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* Clear the bits in bitmap which the blocks of the chunk(s) covered,
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* then increase bb_counters[] for corresponded chunk size.
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*/
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static void ext4_mb_mark_free_simple(struct super_block *sb,
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void *buddy, ext4_grpblk_t first, ext4_grpblk_t len,
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struct ext4_group_info *grp)
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