Patch "f2fs: Do not issue small discards in LFS mode" has been added to the 4.12-stable tree

Patch "f2fs: Do not issue small discards in LFS mode" has been added to the 4.12-stable tree

[gregkh]

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

    f2fs: Do not issue small discards in LFS mode

to the 4.12-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-do-not-issue-small-discards-in-lfs-mode.patch
and it can be found in the queue-4.12 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 acfd2810c75b0625897fc119a2d3a9c26cc0e405 Mon Sep 17 00:00:00 2001
From: Damien Le Moal <damien.lemoal@wdc.com>
Date: Fri, 26 May 2017 17:04:40 +0900
Subject: f2fs: Do not issue small discards in LFS mode

From: Damien Le Moal <damien.lemoal@wdc.com>

commit acfd2810c75b0625897fc119a2d3a9c26cc0e405 upstream.

clear_prefree_segments() issues small discards after discarding full
segments. These small discards may not be section aligned, so not zone
aligned on a zoned block device, causing __f2fs_iissue_discard_zone() to fail.
Fix this by not issuing small discards for a volume mounted with the BLKZONED
feature enabled.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/f2fs/segment.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1329,7 +1329,8 @@ find_next:
 					sbi->blocks_per_seg, cur_pos);
 			len = next_pos - cur_pos;
 
-			if (force && len < cpc->trim_minlen)
+			if (f2fs_sb_mounted_blkzoned(sbi->sb) ||
+			    (force && len < cpc->trim_minlen))
 				goto skip;
 
 			f2fs_issue_discard(sbi, entry->start_blkaddr + cur_pos,


Patches currently in stable-queue which might be from damien.lemoal@wdc.com are

queue-4.12/f2fs-do-not-issue-small-discards-in-lfs-mode.patch