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OpenZFS 7448 - ZFS doesn't notice when disk vdevs have no write cache 

Authored by: Hans Rosenfeld <hans.rosenfeld@nexenta.com>
Reviewed by: Dan Fields <dan.fields@nexenta.com>
Reviewed by: Alek Pinchuk <alek.pinchuk@nexenta.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com>
Reviewed-by: Don Brady <don.brady@intel.com>
Reviewed-by: Tim Chase <tim@chase2k.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: George Melikov <mail@gmelikov.ru>

OpenZFS-issue: https://www.illumos.org/issues/7448
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/295438b
Closes #5737
This commit is contained in:
George Melikov 2017-02-04 20:23:50 +03:00 committed by Brian Behlendorf
parent 0a252daed3
commit 298ec40b6d
2 changed files with 10 additions and 2 deletions
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2
module/zfs/vdev_disk.c
View File

@ -693,8 +693,6 @@ vdev_disk_io_start(zio_t *zio)
return;
zio->io_error = error;
if (error == ENOTSUP)
v->vdev_nowritecache = B_TRUE;
break;

10
module/zfs/zio.c
View File

@ -3393,6 +3393,16 @@ zio_vdev_io_assess(zio_t *zio)
vd->vdev_cant_write = B_TRUE;
}
/*
* If a cache flush returns ENOTSUP or ENOTTY, we know that no future
* attempts will ever succeed. In this case we set a persistent bit so
* that we don't bother with it in the future.
*/
if ((zio->io_error == ENOTSUP || zio->io_error == ENOTTY) &&
zio->io_type == ZIO_TYPE_IOCTL &&
zio->io_cmd == DKIOCFLUSHWRITECACHE && vd != NULL)
vd->vdev_nowritecache = B_TRUE;
if (zio->io_error)
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;