Patch "gfs2: Make flush bios explicitely sync" has been added to the 4.11-stable tree

[<gregkh@linuxfoundation.org>]

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

    gfs2: Make flush bios explicitely sync

to the 4.11-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:
     gfs2-make-flush-bios-explicitely-sync.patch
and it can be found in the queue-4.11 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 0f0b9b63e14fc3f66e4d342df016c9b071c5abed Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Tue, 2 May 2017 13:14:13 +0200
Subject: gfs2: Make flush bios explicitely sync

From: Jan Kara <jack@suse.cz>

commit 0f0b9b63e14fc3f66e4d342df016c9b071c5abed upstream.

Commit b685d3d65ac7 "block: treat REQ_FUA and REQ_PREFLUSH as
synchronous" removed REQ_SYNC flag from WRITE_{FUA|PREFLUSH|...}
definitions.  generic_make_request_checks() however strips REQ_FUA and
REQ_PREFLUSH flags from a bio when the storage doesn't report volatile
write cache and thus write effectively becomes asynchronous which can
lead to performance regressions

Fix the problem by making sure all bios which are synchronous are
properly marked with REQ_SYNC.

Fixes: b685d3d65ac791406e0dfd8779cc9b3707fea5a3
CC: Steven Whitehouse <swhiteho@redhat.com>
CC: cluster-devel@redhat.com
Acked-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/gfs2/log.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -659,7 +659,7 @@ static void log_write_header(struct gfs2
 	struct gfs2_log_header *lh;
 	unsigned int tail;
 	u32 hash;
-	int op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META;
+	int op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC;
 	struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
 	enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 	lh = page_address(page);


Patches currently in stable-queue which might be from jack@suse.cz are

queue-4.11/gfs2-make-flush-bios-explicitely-sync.patch