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linux/block
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Mark McLoughlin 6cafb12dc8 block: silently error unsupported empty barriers too 
With 2.6.32-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 52b1fd5a27
  Author: Mikulas Patocka <mpatocka@redhat.com>
    dm: send empty barriers to targets in dm_flush

We should silently 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>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Neil Brown <neilb@suse.de>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-10-24 14:14:31 +02:00
..
as-iosched.c
blk-barrier.c block: allow large discard requests 2009-10-01 21:19:34 +02:00
blk-core.c block: silently error unsupported empty barriers too 2009-10-24 14:14:31 +02:00
blk-exec.c
blk-integrity.c
blk-ioc.c
blk-iopoll.c
blk-map.c
blk-merge.c block: Seperate read and write statistics of in_flight requests v2 2009-10-06 20:16:55 +02:00
blk-settings.c blk-settings: fix function parameter kernel-doc notation 2009-10-12 08:20:47 +02:00
blk-softirq.c
blk-sysfs.c Add missing blk_trace_remove_sysfs to be in pair with blk_trace_init_sysfs 2009-10-01 21:15:46 +02:00
blk-tag.c block: use proper BLK_RW_ASYNC in blk_queue_start_tag() 2009-10-06 20:19:02 +02:00
blk-timeout.c
blk.h
bsg.c
cfq-iosched.c cfq-iosched: avoid probable slice overrun when idling 2009-10-08 08:43:32 +02:00
compat_ioctl.c block: Topology ioctls 2009-10-03 20:52:01 +02:00
deadline-iosched.c
elevator.c elv_iosched_store(): fix strstrip() misuse 2009-10-09 08:48:08 +02:00
genhd.c block: Seperate read and write statistics of in_flight requests v2 2009-10-06 20:16:55 +02:00
ioctl.c block: Topology ioctls 2009-10-03 20:52:01 +02:00
Kconfig
Kconfig.iosched
Makefile
noop-iosched.c
scsi_ioctl.c