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@xxxxxxxxxxxxxxx> know about it. >From acfd2810c75b0625897fc119a2d3a9c26cc0e405 Mon Sep 17 00:00:00 2001 From: Damien Le Moal <damien.lemoal@xxxxxxx> 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@xxxxxxx> 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@xxxxxxx> Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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@xxxxxxx are queue-4.12/f2fs-do-not-issue-small-discards-in-lfs-mode.patch