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Subject[PATCH] aoe: end barrier bios with EOPNOTSUPP
BugLink: http://bugzilla.kernel.org/show_bug.cgi?id=13942

Bruno Premont noticed that aoe throws a BUG during umount of an XFS in
2.6.31:

[ 5259.349897] aoe: bi_io_vec is NULL
[ 5259.349940] ------------[ cut here ]------------
[ 5259.349958] kernel BUG at /usr/src/linux-2.6/drivers/block/aoe/aoeblk.c:177!
[ 5259.349990] invalid opcode: 0000 [#1]
The bio in question is a barrier. Jens Axboe suggested that such bios
need to be recognized and ended with -EOPNOTSUPP by any driver that
provides its own ->make_request_fn handler and does not handle
barriers.

In testing the changes below eliminate the BUG.

Signed-off-by: Ed L. Cashin <ecashin@coraid.com>
---
After this patch has been reviewed I plan to add this patch to
the aoe quilt tree for linux-next.
drivers/block/aoe/aoeblk.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 2307a27..d6806fb 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -172,6 +172,9 @@ aoeblk_make_request(struct request_queue *q, struct bio *bio)
BUG();
bio_endio(bio, -ENXIO);
return 0;
+ } else if (bio_barrier(bio)) {
+ bio_endio(bio, -EOPNOTSUPP);
+ return 0;
} else if (bio->bi_io_vec == NULL) {
printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
BUG();
--
1.5.6.5

--
Ed Cashin
http://noserose.net/e/
http://www.coraid.com/


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