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f2fs: fix recording invalid last_victim

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When doing garbage collection, we try to record segment offset which
locates at next one of last victim, using it as the start offset in
next searching.

But in some corner cases, recorded offset may cross the end of main
segment area, it will cause incorrectly searching in dirty_segmap
bitmap. This patch adds modular operation to avoid this issue.

Reported-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2017-03-21 20:09:45 +08:00 committed by Jaegeuk Kim
parent 8f73cbb7d4
commit 9897159a7b
1 changed files with 1 additions and 0 deletions
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fs/f2fs/gc.c
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@ -361,6 +361,7 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
sbi->last_victim[p.gc_mode] = last_victim + 1;
else
sbi->last_victim[p.gc_mode] = segno + 1;
sbi->last_victim[p.gc_mode] %= MAIN_SEGS(sbi);
break;
}
}