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

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

[gregkh]

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

    reiserfs: 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:
     reiserfs-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 d8747d642ec4ce96adf17ae35652a5e4015cfe02 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Tue, 2 May 2017 13:16:18 +0200
Subject: reiserfs: Make flush bios explicitely sync

From: Jan Kara <jack@suse.cz>

commit d8747d642ec4ce96adf17ae35652a5e4015cfe02 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: reiserfs-devel@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/reiserfs/journal.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -1112,7 +1112,7 @@ static int flush_commit_list(struct supe
 		depth = reiserfs_write_unlock_nested(s);
 		if (reiserfs_barrier_flush(s))
 			__sync_dirty_buffer(jl->j_commit_bh,
-					REQ_PREFLUSH | REQ_FUA);
+					REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
 		else
 			sync_dirty_buffer(jl->j_commit_bh);
 		reiserfs_write_lock_nested(s, depth);
@@ -1271,7 +1271,7 @@ static int _update_journal_header_block(
 
 		if (reiserfs_barrier_flush(sb))
 			__sync_dirty_buffer(journal->j_header_bh,
-					REQ_PREFLUSH | REQ_FUA);
+					REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
 		else
 			sync_dirty_buffer(journal->j_header_bh);
 


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

queue-4.11/reiserfs-make-flush-bios-explicitely-sync.patch
queue-4.11/ext4-fix-data-corruption-with-ext4_get_blocks_zero.patch
queue-4.11/cfq-iosched-fix-the-delay-of-cfq_group-s-vdisktime-under-iops-mode.patch
queue-4.11/ext4-fix-fdatasync-2-after-extent-manipulation-operations.patch
queue-4.11/gfs2-make-flush-bios-explicitely-sync.patch
queue-4.11/block-avoid-that-blk_exit_rl-triggers-a-use-after-free.patch
queue-4.11/ext4-fix-seek_hole.patch