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zio: remove io_cmd and DKIOCFLUSHWRITECACHE

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There's no other options, so we can just always assume its a flush.

Includes some light refactoring where a switch statement was doing
control flow that no longer works.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #16064
This commit is contained in:
Rob Norris
2024-04-04 22:34:54 +11:00
committed by Brian Behlendorf
parent cac416f106
commit c9c838aa1f
10 changed files with 106 additions and 157 deletions
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module/os/linux/zfs/vdev_disk.c
+15 -24
View File
@@ -1403,38 +1403,29 @@ vdev_disk_io_start(zio_t *zio)
case ZIO_TYPE_IOCTL:
if (!vdev_readable(v)) {
rw_exit(&vd->vd_lock);
zio->io_error = SET_ERROR(ENXIO);
zio_interrupt(zio);
return;
}
switch (zio->io_cmd) {
case DKIOCFLUSHWRITECACHE:
if (zfs_nocacheflush)
break;
if (v->vdev_nowritecache) {
zio->io_error = SET_ERROR(ENOTSUP);
break;
}
/* Drive not there, can't flush */
error = SET_ERROR(ENXIO);
} else if (zfs_nocacheflush) {
/* Flushing disabled by operator, declare success */
error = 0;
} else if (v->vdev_nowritecache) {
/* This vdev not capable of flushing */
error = SET_ERROR(ENOTSUP);
} else {
/*
* Issue the flush. If successful, the response will
* be handled in the completion callback, so we're done.
*/
error = vdev_disk_io_flush(BDH_BDEV(vd->vd_bdh), zio);
if (error == 0) {
rw_exit(&vd->vd_lock);
return;
}
zio->io_error = error;
break;
default:
zio->io_error = SET_ERROR(ENOTSUP);
}
/* Couldn't issue the flush, so set the error and return it */
rw_exit(&vd->vd_lock);
zio->io_error = error;
zio_execute(zio);
return;