Patch "f2fs: relax node version check for victim data in gc" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    f2fs: relax node version check for victim data in gc

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     f2fs-relax-node-version-check-for-victim-data-in-gc.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Mar 19 09:58:12 CET 2018
From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Tue, 21 Mar 2017 10:59:50 -0400
Subject: f2fs: relax node version check for victim data in gc

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 alive

So, this patch fixes subtle corrupted case where node version does not match
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/f2fs/gc.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -522,8 +522,10 @@ static bool is_alive(struct f2fs_sb_info
 	get_node_info(sbi, nid, dni);
 
 	if (sum->version != 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);
 	}
 
 	*nofs = ofs_of_node(node_page);


Patches currently in stable-queue which might be from jaegeuk@kernel.org are

queue-4.4/f2fs-relax-node-version-check-for-victim-data-in-gc.patch