This is a note to let you know that I've just added the patch titled
mm/bounce.c: fix a regression where MS_SNAP_STABLE (stable pages snapshotting) was ignored
to the 3.11-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:
mm-bounce.c-fix-a-regression-where-ms_snap_stable-stable-pages-snapshotting-was-ignored.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 83b2944fd2532b92db099cb3ada12df32a05b368 Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Date: Mon, 30 Sep 2013 13:45:09 -0700
Subject: mm/bounce.c: fix a regression where MS_SNAP_STABLE (stable pages snapshotting) was ignored
From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
commit 83b2944fd2532b92db099cb3ada12df32a05b368 upstream.
The "force" parameter in __blk_queue_bounce was being ignored, which
means that stable page snapshots are not always happening (on ext3).
This of course leads to DIF disks reporting checksum errors, so fix this
regression.
The regression was introduced in commit 6bc454d15004 ("bounce: Refactor
__blk_queue_bounce to not use bi_io_vec")
Reported-by: Mel Gorman <mgorman@xxxxxxx>
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Cc: Kent Overstreet <koverstreet@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/bounce.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -204,6 +204,8 @@ static void __blk_queue_bounce(struct re
struct bio_vec *to, *from;
unsigned i;
+ if (force)
+ goto bounce;
bio_for_each_segment(from, *bio_orig, i)
if (page_to_pfn(from->bv_page) > queue_bounce_pfn(q))
goto bounce;
Patches currently in stable-queue which might be from darrick.wong@xxxxxxxxxx are
queue-3.11/mm-bounce.c-fix-a-regression-where-ms_snap_stable-stable-pages-snapshotting-was-ignored.patch
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