Commit 9897159a authored Mar 21, 2017 by Chao Yu Committed by Jaegeuk Kim Mar 24, 2017

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>

parent 8f73cbb7

fs/f2fs/gc.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}
		}

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