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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Jaegeuk Kim <jaegeuk@kernel.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 085/219] f2fs: relax node version check for
 victim data in gc
Thread-Topic: [PATCH AUTOSEL for 4.9 085/219] f2fs: relax node version check
 for victim data in gc
Thread-Index: AQHTsz79pQcrRuTEJk2OK0zmav35Aw==
Date:   Sat, 3 Mar 2018 22:28:45 +0000
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From: Jaegeuk Kim <jaegeuk@kernel.org>

[ Upstream commit c13ff37e359bb3eacf4e1760dcea8d9760aa7459 ]

- has_not_enough_free_secs
node_secs: 0  dent_secs: 0  freed:0  free_segments:103  reserved:104

          - f2fs_gc
             - get_victim_by_default
alloc_mode 0, gc_mode 1, max_search 2672, offset 4654, ofs_unit 1

                - do_garbage_collect
start_segno 3976, end_segno 3977   type 0

                  - is_alive
nid 22797, blkaddr 2131882, ofs_in_node 0, version 0x8/0x0

                   - gc_data_segment 766, segno 3976, block 512/426 not ali=
ve

So, this patch fixes subtle corrupted case where node version does not matc=
h
to summary version which results in infinite loop by gc.

Reported-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 fs/f2fs/gc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 34a69e7ed90b..17ab23f64bba 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -538,8 +538,10 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct =
f2fs_summary *sum,
 	get_node_info(sbi, nid, dni);
=20
 	if (sum->version !=3D dni->version) {
-		f2fs_put_page(node_page, 1);
-		return false;
+		f2fs_msg(sbi->sb, KERN_WARNING,
+				"%s: valid data with mismatched node version.",
+				__func__);
+		set_sbi_flag(sbi, SBI_NEED_FSCK);
 	}
=20
 	*nofs =3D ofs_of_node(node_page);
--=20
2.14.1