From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Subject: 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 6bc454d1 ("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>
Cc: <stable@xxxxxxxxxxxxxxx> [3.10+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/bounce.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/bounce.c~mm-bouncec-wix-a-regression-where-ms_snap_stable-stable-pages-snapshotting-was-ignored mm/bounce.c
--- a/mm/bounce.c~mm-bouncec-wix-a-regression-where-ms_snap_stable-stable-pages-snapshotting-was-ignored
+++ a/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;
_
--
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