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

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 <[email protected]> know about it.

From: Damien Le Moal <[email protected]>
Date: Fri, 26 May 2017 17:04:40 +0900
Subject: f2fs: Do not issue small discards in LFS mode

From: Damien Le Moal <[email protected]>

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.

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

@@ -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 [email protected] are

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