lkml.org 
[lkml]   [2009]   [Aug]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH] block: silently error unsupported empty barriers too
From
Date
With 2.6.31-rc5 in a KVM guest using dm and virtio_blk, we see the
following errors:

end_request: I/O error, dev vda, sector 0
end_request: I/O error, dev vda, sector 0

The errors go away if dm stops submitting empty barriers, by reverting:

commit 52b1fd5a27c625c78373e024bf570af3c9d44a79
Author: Mikulas Patocka <mpatocka@redhat.com>
dm: send empty barriers to targets in dm_flush

We should error all barriers, even empty barriers, on devices like
virtio_blk which don't support them.

See also:

https://bugzilla.redhat.com/514901

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Alasdair G Kergon <agk@redhat.com>
Cc: Neil Brown <neilb@suse.de>
---
block/blk-core.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index e3299a7..35ad2bb 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1163,8 +1163,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
const int unplug = bio_unplug(bio);
int rw_flags;

- if (bio_barrier(bio) && bio_has_data(bio) &&
- (q->next_ordered == QUEUE_ORDERED_NONE)) {
+ if (bio_barrier(bio) && (q->next_ordered == QUEUE_ORDERED_NONE)) {
bio_endio(bio, -EOPNOTSUPP);
return 0;
}
--
1.6.4


\
 
 \ /
  Last update: 2009-08-06 13:17    [W:0.098 / U:0.440 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site