This is a note to let you know that I've just added the patch titled
block: Do a full clone when splitting discard bios
to the 3.14-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:
block-do-a-full-clone-when-splitting-discard-bios.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f3f5da624e0a891c34d8cd513c57f1d9b0c7dadc Mon Sep 17 00:00:00 2001
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Date: Wed, 22 Jul 2015 07:57:12 -0400
Subject: block: Do a full clone when splitting discard bios
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
commit f3f5da624e0a891c34d8cd513c57f1d9b0c7dadc upstream.
This fixes a data corruption bug when using discard on top of MD linear,
raid0 and raid10 personalities.
Commit 20d0189b1012 "block: Introduce new bio_split()" permits sharing
the bio_vec between the two resulting bios. That is fine for read/write
requests where the bio_vec is immutable. For discards, however, we need
to be able to attach a payload and update the bio_vec so the page can
get mapped to a scatterlist entry. Therefore the bio_vec can not be
shared when splitting discards and we must do a full clone.
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Reported-by: Seunguk Shin <seunguk.shin@xxxxxxxxxxx>
Tested-by: Seunguk Shin <seunguk.shin@xxxxxxxxxxx>
Cc: Seunguk Shin <seunguk.shin@xxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/bio.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1806,8 +1806,9 @@ EXPORT_SYMBOL(bio_endio_nodec);
* Allocates and returns a new bio which represents @sectors from the start of
* @bio, and updates @bio to represent the remaining sectors.
*
- * The newly allocated bio will point to @bio's bi_io_vec; it is the caller's
- * responsibility to ensure that @bio is not freed before the split.
+ * Unless this is a discard request the newly allocated bio will point
+ * to @bio's bi_io_vec; it is the caller's responsibility to ensure that
+ * @bio is not freed before the split.
*/
struct bio *bio_split(struct bio *bio, int sectors,
gfp_t gfp, struct bio_set *bs)
@@ -1817,7 +1818,15 @@ struct bio *bio_split(struct bio *bio, i
BUG_ON(sectors <= 0);
BUG_ON(sectors >= bio_sectors(bio));
- split = bio_clone_fast(bio, gfp, bs);
+ /*
+ * Discards need a mutable bio_vec to accommodate the payload
+ * required by the DSM TRIM and UNMAP commands.
+ */
+ if (bio->bi_rw & REQ_DISCARD)
+ split = bio_clone_bioset(bio, gfp, bs);
+ else
+ split = bio_clone_fast(bio, gfp, bs);
+
if (!split)
return NULL;
Patches currently in stable-queue which might be from martin.petersen@xxxxxxxxxx are
queue-3.14/block-do-a-full-clone-when-splitting-discard-bios.patch
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