Commit 83b2944f authored Sep 30, 2013 by Darrick J. Wong Committed by Linus Torvalds Sep 30, 2013

mm/bounce.c: fix a regression where MS_SNAP_STABLE (stable pages snapshotting) was ignored



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 6bc454d1 ("bounce: Refactor
__blk_queue_bounce to not use bi_io_vec")

Reported-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: <stable@vger.kernel.org>	[3.10+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 4c1c7be9

mm/bounce.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -204,6 +204,8 @@ static void __blk_queue_bounce(struct request_queue q, struct bio *bio_orig,
		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;

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