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authorChao Yu <yuchao0@huawei.com>2017-03-21 15:09:45 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2017-03-24 22:10:48 +0300
commit9897159a7b1aa98ec0bc8fc053ab822e6634e7fa (patch)
treeb60c808243ffc2ce2538769c8d979bd04ade01a6 /fs/f2fs/gc.c
parent8f73cbb7d4f300eda84a00ffe8bf9f7cf2d3ea06 (diff)
downloadlinux-9897159a7b1aa98ec0bc8fc053ab822e6634e7fa.tar.xz
f2fs: fix recording invalid last_victim
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>
Diffstat (limited to 'fs/f2fs/gc.c')
-rw-r--r--fs/f2fs/gc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 418fd9881646..939be88a8833 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -361,6 +361,7 @@ next:
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;
}
}