f2fs: fix uninitialized skipped_gc_rwsem

[ Upstream commit c17caf0ba3aa3411b96c71b4ce24be1040b8f3e8 ]

When f2fs skipped a gc round during victim migration, there was a bug which
would skip all upcoming gc rounds unconditionally because skipped_gc_rwsem
was not initialized. It fixes the bug by correctly initializing the
skipped_gc_rwsem inside the gc loop.

Fixes: 6f8d4455060d ("f2fs: avoid fi->i_gc_rwsem[WRITE] lock in f2fs_gc")
Signed-off-by: Yonggil Song <yonggil.song@samsung.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index ee68364..aa928d1 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1792,8 +1792,8 @@ int f2fs_gc(struct f2fs_sb_info *sbi, struct f2fs_gc_control *gc_control)
                                prefree_segments(sbi));
 
        cpc.reason = __get_cp_reason(sbi);
-       sbi->skipped_gc_rwsem = 0;
 gc_more:
+       sbi->skipped_gc_rwsem = 0;
        if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
                ret = -EINVAL;
                goto stop;