4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (C) 2008-2010 Lawrence Livermore National Security, LLC.
23 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
24 * Rewritten for Linux by Brian Behlendorf <behlendorf1@llnl.gov>.
26 * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
29 #include <sys/zfs_context.h>
31 #include <sys/vdev_disk.h>
32 #include <sys/vdev_impl.h>
34 #include <sys/fs/zfs.h>
36 #include <sys/sunldi.h>
38 char *zfs_vdev_scheduler
= VDEV_SCHEDULER
;
39 static void *zfs_vdev_holder
= VDEV_HOLDER
;
42 * Virtual device vector for disks.
44 typedef struct dio_request
{
45 zio_t
*dr_zio
; /* Parent ZIO */
46 void *dr_loanbuf
; /* borrowed abd buffer */
47 atomic_t dr_ref
; /* References */
48 int dr_error
; /* Bio error */
49 int dr_bio_count
; /* Count of bio's */
50 struct bio
*dr_bio
[0]; /* Attached bio's */
54 #ifdef HAVE_OPEN_BDEV_EXCLUSIVE
56 vdev_bdev_mode(int smode
)
60 ASSERT3S(smode
& (FREAD
| FWRITE
), !=, 0);
72 vdev_bdev_mode(int smode
)
76 ASSERT3S(smode
& (FREAD
| FWRITE
), !=, 0);
78 if ((smode
& FREAD
) && !(smode
& FWRITE
))
83 #endif /* HAVE_OPEN_BDEV_EXCLUSIVE */
86 bdev_capacity(struct block_device
*bdev
)
88 struct hd_struct
*part
= bdev
->bd_part
;
90 /* The partition capacity referenced by the block device */
92 return (part
->nr_sects
<< 9);
94 /* Otherwise assume the full device capacity */
95 return (get_capacity(bdev
->bd_disk
) << 9);
99 vdev_disk_error(zio_t
*zio
)
102 printk("ZFS: zio error=%d type=%d offset=%llu size=%llu "
103 "flags=%x\n", zio
->io_error
, zio
->io_type
,
104 (u_longlong_t
)zio
->io_offset
, (u_longlong_t
)zio
->io_size
,
110 * Use the Linux 'noop' elevator for zfs managed block devices. This
111 * strikes the ideal balance by allowing the zfs elevator to do all
112 * request ordering and prioritization. While allowing the Linux
113 * elevator to do the maximum front/back merging allowed by the
114 * physical device. This yields the largest possible requests for
115 * the device with the lowest total overhead.
118 vdev_elevator_switch(vdev_t
*v
, char *elevator
)
120 vdev_disk_t
*vd
= v
->vdev_tsd
;
121 struct block_device
*bdev
= vd
->vd_bdev
;
122 struct request_queue
*q
= bdev_get_queue(bdev
);
123 char *device
= bdev
->bd_disk
->disk_name
;
127 * Skip devices which are not whole disks (partitions).
128 * Device-mapper devices are excepted since they may be whole
129 * disks despite the vdev_wholedisk flag, in which case we can
130 * and should switch the elevator. If the device-mapper device
131 * does not have an elevator (i.e. dm-raid, dm-crypt, etc.) the
132 * "Skip devices without schedulers" check below will fail.
134 if (!v
->vdev_wholedisk
&& strncmp(device
, "dm-", 3) != 0)
137 /* Skip devices without schedulers (loop, ram, dm, etc) */
138 if (!q
->elevator
|| !blk_queue_stackable(q
))
141 /* Leave existing scheduler when set to "none" */
142 if ((strncmp(elevator
, "none", 4) == 0) && (strlen(elevator
) == 4))
145 #ifdef HAVE_ELEVATOR_CHANGE
146 error
= elevator_change(q
, elevator
);
149 * For pre-2.6.36 kernels elevator_change() is not available.
150 * Therefore we fall back to using a usermodehelper to echo the
151 * elevator into sysfs; This requires /bin/echo and sysfs to be
152 * mounted which may not be true early in the boot process.
154 #define SET_SCHEDULER_CMD \
155 "exec 0</dev/null " \
156 " 1>/sys/block/%s/queue/scheduler " \
161 char *argv
[] = { "/bin/sh", "-c", NULL
, NULL
};
162 char *envp
[] = { NULL
};
164 argv
[2] = kmem_asprintf(SET_SCHEDULER_CMD
, device
, elevator
);
165 error
= call_usermodehelper(argv
[0], argv
, envp
, UMH_WAIT_PROC
);
168 #endif /* HAVE_ELEVATOR_CHANGE */
170 printk("ZFS: Unable to set \"%s\" scheduler for %s (%s): %d\n",
171 elevator
, v
->vdev_path
, device
, error
);
177 * Expanding a whole disk vdev involves invoking BLKRRPART on the
178 * whole disk device. This poses a problem, because BLKRRPART will
179 * return EBUSY if one of the disk's partitions is open. That's why
180 * we have to do it here, just before opening the data partition.
181 * Unfortunately, BLKRRPART works by dropping all partitions and
182 * recreating them, which means that for a short time window, all
183 * /dev/sdxN device files disappear (until udev recreates them).
184 * This means two things:
185 * - When we open the data partition just after a BLKRRPART, we
186 * can't do it using the normal device file path because of the
187 * obvious race condition with udev. Instead, we use reliable
188 * kernel APIs to get a handle to the new partition device from
189 * the whole disk device.
190 * - Because vdev_disk_open() initially needs to find the device
191 * using its path, multiple vdev_disk_open() invocations in
192 * short succession on the same disk with BLKRRPARTs in the
193 * middle have a high probability of failure (because of the
194 * race condition with udev). A typical situation where this
195 * might happen is when the zpool userspace tool does a
196 * TRYIMPORT immediately followed by an IMPORT. For this
197 * reason, we only invoke BLKRRPART in the module when strictly
198 * necessary (zpool online -e case), and rely on userspace to
199 * do it when possible.
201 static struct block_device
*
202 vdev_disk_rrpart(const char *path
, int mode
, vdev_disk_t
*vd
)
204 #if defined(HAVE_3ARG_BLKDEV_GET) && defined(HAVE_GET_GENDISK)
205 struct block_device
*bdev
, *result
= ERR_PTR(-ENXIO
);
206 struct gendisk
*disk
;
209 bdev
= vdev_bdev_open(path
, vdev_bdev_mode(mode
), zfs_vdev_holder
);
213 disk
= get_gendisk(bdev
->bd_dev
, &partno
);
214 vdev_bdev_close(bdev
, vdev_bdev_mode(mode
));
217 bdev
= bdget(disk_devt(disk
));
219 error
= blkdev_get(bdev
, vdev_bdev_mode(mode
), vd
);
221 error
= ioctl_by_bdev(bdev
, BLKRRPART
, 0);
222 vdev_bdev_close(bdev
, vdev_bdev_mode(mode
));
225 bdev
= bdget_disk(disk
, partno
);
227 error
= blkdev_get(bdev
,
228 vdev_bdev_mode(mode
) | FMODE_EXCL
, vd
);
237 return (ERR_PTR(-EOPNOTSUPP
));
238 #endif /* defined(HAVE_3ARG_BLKDEV_GET) && defined(HAVE_GET_GENDISK) */
242 vdev_disk_open(vdev_t
*v
, uint64_t *psize
, uint64_t *max_psize
,
245 struct block_device
*bdev
= ERR_PTR(-ENXIO
);
247 int count
= 0, mode
, block_size
;
249 /* Must have a pathname and it must be absolute. */
250 if (v
->vdev_path
== NULL
|| v
->vdev_path
[0] != '/') {
251 v
->vdev_stat
.vs_aux
= VDEV_AUX_BAD_LABEL
;
252 return (SET_ERROR(EINVAL
));
256 * Reopen the device if it's not currently open. Otherwise,
257 * just update the physical size of the device.
259 if (v
->vdev_tsd
!= NULL
) {
260 ASSERT(v
->vdev_reopening
);
265 vd
= kmem_zalloc(sizeof (vdev_disk_t
), KM_SLEEP
);
267 return (SET_ERROR(ENOMEM
));
270 * Devices are always opened by the path provided at configuration
271 * time. This means that if the provided path is a udev by-id path
272 * then drives may be recabled without an issue. If the provided
273 * path is a udev by-path path, then the physical location information
274 * will be preserved. This can be critical for more complicated
275 * configurations where drives are located in specific physical
276 * locations to maximize the systems tolerence to component failure.
277 * Alternatively, you can provide your own udev rule to flexibly map
278 * the drives as you see fit. It is not advised that you use the
279 * /dev/[hd]d devices which may be reordered due to probing order.
280 * Devices in the wrong locations will be detected by the higher
281 * level vdev validation.
283 * The specified paths may be briefly removed and recreated in
284 * response to udev events. This should be exceptionally unlikely
285 * because the zpool command makes every effort to verify these paths
286 * have already settled prior to reaching this point. Therefore,
287 * a ENOENT failure at this point is highly likely to be transient
288 * and it is reasonable to sleep and retry before giving up. In
289 * practice delays have been observed to be on the order of 100ms.
291 mode
= spa_mode(v
->vdev_spa
);
292 if (v
->vdev_wholedisk
&& v
->vdev_expanding
)
293 bdev
= vdev_disk_rrpart(v
->vdev_path
, mode
, vd
);
295 while (IS_ERR(bdev
) && count
< 50) {
296 bdev
= vdev_bdev_open(v
->vdev_path
,
297 vdev_bdev_mode(mode
), zfs_vdev_holder
);
298 if (unlikely(PTR_ERR(bdev
) == -ENOENT
)) {
301 } else if (IS_ERR(bdev
)) {
307 dprintf("failed open v->vdev_path=%s, error=%d count=%d\n",
308 v
->vdev_path
, -PTR_ERR(bdev
), count
);
309 kmem_free(vd
, sizeof (vdev_disk_t
));
310 return (SET_ERROR(-PTR_ERR(bdev
)));
317 /* Determine the physical block size */
318 block_size
= vdev_bdev_block_size(vd
->vd_bdev
);
320 /* Clear the nowritecache bit, causes vdev_reopen() to try again. */
321 v
->vdev_nowritecache
= B_FALSE
;
323 /* Inform the ZIO pipeline that we are non-rotational */
324 v
->vdev_nonrot
= blk_queue_nonrot(bdev_get_queue(vd
->vd_bdev
));
326 /* Physical volume size in bytes */
327 *psize
= bdev_capacity(vd
->vd_bdev
);
329 /* TODO: report possible expansion size */
332 /* Based on the minimum sector size set the block size */
333 *ashift
= highbit64(MAX(block_size
, SPA_MINBLOCKSIZE
)) - 1;
335 /* Try to set the io scheduler elevator algorithm */
336 (void) vdev_elevator_switch(v
, zfs_vdev_scheduler
);
342 vdev_disk_close(vdev_t
*v
)
344 vdev_disk_t
*vd
= v
->vdev_tsd
;
346 if (v
->vdev_reopening
|| vd
== NULL
)
349 if (vd
->vd_bdev
!= NULL
)
350 vdev_bdev_close(vd
->vd_bdev
,
351 vdev_bdev_mode(spa_mode(v
->vdev_spa
)));
353 kmem_free(vd
, sizeof (vdev_disk_t
));
357 static dio_request_t
*
358 vdev_disk_dio_alloc(int bio_count
)
363 dr
= kmem_zalloc(sizeof (dio_request_t
) +
364 sizeof (struct bio
*) * bio_count
, KM_SLEEP
);
366 atomic_set(&dr
->dr_ref
, 0);
367 dr
->dr_bio_count
= bio_count
;
370 for (i
= 0; i
< dr
->dr_bio_count
; i
++)
371 dr
->dr_bio
[i
] = NULL
;
378 vdev_disk_dio_free(dio_request_t
*dr
)
382 for (i
= 0; i
< dr
->dr_bio_count
; i
++)
384 bio_put(dr
->dr_bio
[i
]);
386 kmem_free(dr
, sizeof (dio_request_t
) +
387 sizeof (struct bio
*) * dr
->dr_bio_count
);
391 vdev_disk_dio_get(dio_request_t
*dr
)
393 atomic_inc(&dr
->dr_ref
);
397 vdev_disk_dio_put(dio_request_t
*dr
)
399 int rc
= atomic_dec_return(&dr
->dr_ref
);
402 * Free the dio_request when the last reference is dropped and
403 * ensure zio_interpret is called only once with the correct zio
406 zio_t
*zio
= dr
->dr_zio
;
407 void *loanbuf
= dr
->dr_loanbuf
;
408 int error
= dr
->dr_error
;
410 vdev_disk_dio_free(dr
);
413 zio
->io_error
= error
;
414 ASSERT3S(zio
->io_error
, >=, 0);
416 vdev_disk_error(zio
);
417 /* ABD placeholder */
418 if (loanbuf
!= NULL
) {
419 if (zio
->io_type
== ZIO_TYPE_READ
) {
420 abd_copy_from_buf(zio
->io_abd
, loanbuf
,
423 zio_buf_free(loanbuf
, zio
->io_size
);
426 zio_delay_interrupt(zio
);
433 BIO_END_IO_PROTO(vdev_disk_physio_completion
, bio
, error
)
435 dio_request_t
*dr
= bio
->bi_private
;
438 if (dr
->dr_error
== 0) {
439 #ifdef HAVE_1ARG_BIO_END_IO_T
440 dr
->dr_error
= -(bio
->bi_error
);
443 dr
->dr_error
= -(error
);
444 else if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
449 /* Drop reference aquired by __vdev_disk_physio */
450 rc
= vdev_disk_dio_put(dr
);
453 static inline unsigned long
454 bio_nr_pages(void *bio_ptr
, unsigned int bio_size
)
456 return ((((unsigned long)bio_ptr
+ bio_size
+ PAGE_SIZE
- 1) >>
457 PAGE_SHIFT
) - ((unsigned long)bio_ptr
>> PAGE_SHIFT
));
461 bio_map(struct bio
*bio
, void *bio_ptr
, unsigned int bio_size
)
463 unsigned int offset
, size
, i
;
466 offset
= offset_in_page(bio_ptr
);
467 for (i
= 0; i
< bio
->bi_max_vecs
; i
++) {
468 size
= PAGE_SIZE
- offset
;
476 if (is_vmalloc_addr(bio_ptr
))
477 page
= vmalloc_to_page(bio_ptr
);
479 page
= virt_to_page(bio_ptr
);
482 * Some network related block device uses tcp_sendpage, which
483 * doesn't behave well when using 0-count page, this is a
484 * safety net to catch them.
486 ASSERT3S(page_count(page
), >, 0);
488 if (bio_add_page(bio
, page
, size
, offset
) != size
)
499 #ifndef bio_set_op_attrs
500 #define bio_set_op_attrs(bio, rw, flags) \
501 do { (bio)->bi_rw |= (rw)|(flags); } while (0)
505 vdev_submit_bio_impl(struct bio
*bio
)
507 #ifdef HAVE_1ARG_SUBMIT_BIO
515 vdev_submit_bio(struct bio
*bio
)
517 #ifdef HAVE_CURRENT_BIO_TAIL
518 struct bio
**bio_tail
= current
->bio_tail
;
519 current
->bio_tail
= NULL
;
520 vdev_submit_bio_impl(bio
);
521 current
->bio_tail
= bio_tail
;
523 struct bio_list
*bio_list
= current
->bio_list
;
524 current
->bio_list
= NULL
;
525 vdev_submit_bio_impl(bio
);
526 current
->bio_list
= bio_list
;
531 __vdev_disk_physio(struct block_device
*bdev
, zio_t
*zio
, caddr_t kbuf_ptr
,
532 size_t kbuf_size
, uint64_t kbuf_offset
, int rw
, int flags
)
537 int bio_size
, bio_count
= 16;
538 int i
= 0, error
= 0;
539 #if defined(HAVE_BLK_QUEUE_HAVE_BLK_PLUG)
540 struct blk_plug plug
;
543 ASSERT3U(kbuf_offset
+ kbuf_size
, <=, bdev
->bd_inode
->i_size
);
546 dr
= vdev_disk_dio_alloc(bio_count
);
550 if (zio
&& !(zio
->io_flags
& (ZIO_FLAG_IO_RETRY
| ZIO_FLAG_TRYHARD
)))
551 bio_set_flags_failfast(bdev
, &flags
);
556 * When the IO size exceeds the maximum bio size for the request
557 * queue we are forced to break the IO in multiple bio's and wait
558 * for them all to complete. Ideally, all pool users will set
559 * their volume block size to match the maximum request size and
560 * the common case will be one bio per vdev IO request.
563 abd_t
*abd
= zio
->io_abd
;
567 * We can't use abd_borrow_buf routines here since our
568 * completion context is interrupt and abd refcounts
569 * take a mutex (in debug mode).
571 if (abd_is_linear(abd
)) {
572 bio_ptr
= abd_to_buf(abd
);
573 dr
->dr_loanbuf
= NULL
;
575 bio_ptr
= zio_buf_alloc(zio
->io_size
);
576 dr
->dr_loanbuf
= bio_ptr
;
577 if (zio
->io_type
!= ZIO_TYPE_READ
)
578 abd_copy_to_buf(bio_ptr
, abd
, zio
->io_size
);
583 dr
->dr_loanbuf
= NULL
;
586 bio_offset
= kbuf_offset
;
587 bio_size
= kbuf_size
;
588 for (i
= 0; i
<= dr
->dr_bio_count
; i
++) {
590 /* Finished constructing bio's for given buffer */
595 * By default only 'bio_count' bio's per dio are allowed.
596 * However, if we find ourselves in a situation where more
597 * are needed we allocate a larger dio and warn the user.
599 if (dr
->dr_bio_count
== i
) {
601 zio_buf_free(dr
->dr_loanbuf
, zio
->io_size
);
602 vdev_disk_dio_free(dr
);
607 /* bio_alloc() with __GFP_WAIT never returns NULL */
608 dr
->dr_bio
[i
] = bio_alloc(GFP_NOIO
,
609 MIN(bio_nr_pages(bio_ptr
, bio_size
), BIO_MAX_PAGES
));
610 if (unlikely(dr
->dr_bio
[i
] == NULL
)) {
612 zio_buf_free(dr
->dr_loanbuf
, zio
->io_size
);
613 vdev_disk_dio_free(dr
);
617 /* Matching put called by vdev_disk_physio_completion */
618 vdev_disk_dio_get(dr
);
620 dr
->dr_bio
[i
]->bi_bdev
= bdev
;
621 BIO_BI_SECTOR(dr
->dr_bio
[i
]) = bio_offset
>> 9;
622 dr
->dr_bio
[i
]->bi_end_io
= vdev_disk_physio_completion
;
623 dr
->dr_bio
[i
]->bi_private
= dr
;
624 bio_set_op_attrs(dr
->dr_bio
[i
], rw
, flags
);
626 /* Remaining size is returned to become the new size */
627 bio_size
= bio_map(dr
->dr_bio
[i
], bio_ptr
, bio_size
);
629 /* Advance in buffer and construct another bio if needed */
630 bio_ptr
+= BIO_BI_SIZE(dr
->dr_bio
[i
]);
631 bio_offset
+= BIO_BI_SIZE(dr
->dr_bio
[i
]);
634 /* Extra reference to protect dio_request during vdev_submit_bio */
635 vdev_disk_dio_get(dr
);
637 #if defined(HAVE_BLK_QUEUE_HAVE_BLK_PLUG)
638 if (dr
->dr_bio_count
> 1)
639 blk_start_plug(&plug
);
642 /* Submit all bio's associated with this dio */
643 for (i
= 0; i
< dr
->dr_bio_count
; i
++)
645 vdev_submit_bio(dr
->dr_bio
[i
]);
647 #if defined(HAVE_BLK_QUEUE_HAVE_BLK_PLUG)
648 if (dr
->dr_bio_count
> 1)
649 blk_finish_plug(&plug
);
652 (void) vdev_disk_dio_put(dr
);
657 BIO_END_IO_PROTO(vdev_disk_io_flush_completion
, bio
, rc
)
659 zio_t
*zio
= bio
->bi_private
;
660 #ifdef HAVE_1ARG_BIO_END_IO_T
661 int rc
= bio
->bi_error
;
665 if (rc
&& (rc
== -EOPNOTSUPP
))
666 zio
->io_vd
->vdev_nowritecache
= B_TRUE
;
669 ASSERT3S(zio
->io_error
, >=, 0);
671 vdev_disk_error(zio
);
676 vdev_disk_io_flush(struct block_device
*bdev
, zio_t
*zio
)
678 struct request_queue
*q
;
681 q
= bdev_get_queue(bdev
);
685 bio
= bio_alloc(GFP_NOIO
, 0);
686 /* bio_alloc() with __GFP_WAIT never returns NULL */
687 if (unlikely(bio
== NULL
))
690 bio
->bi_end_io
= vdev_disk_io_flush_completion
;
691 bio
->bi_private
= zio
;
693 bio_set_op_attrs(bio
, 0, VDEV_WRITE_FLUSH_FUA
);
694 vdev_submit_bio(bio
);
695 invalidate_bdev(bdev
);
701 vdev_disk_io_start(zio_t
*zio
)
703 vdev_t
*v
= zio
->io_vd
;
704 vdev_disk_t
*vd
= v
->vdev_tsd
;
705 int rw
, flags
, error
;
707 switch (zio
->io_type
) {
710 if (!vdev_readable(v
)) {
711 zio
->io_error
= SET_ERROR(ENXIO
);
716 switch (zio
->io_cmd
) {
717 case DKIOCFLUSHWRITECACHE
:
719 if (zfs_nocacheflush
)
722 if (v
->vdev_nowritecache
) {
723 zio
->io_error
= SET_ERROR(ENOTSUP
);
727 error
= vdev_disk_io_flush(vd
->vd_bdev
, zio
);
731 zio
->io_error
= error
;
732 if (error
== ENOTSUP
)
733 v
->vdev_nowritecache
= B_TRUE
;
738 zio
->io_error
= SET_ERROR(ENOTSUP
);
745 #if defined(HAVE_BLK_QUEUE_HAVE_BIO_RW_UNPLUG)
746 flags
= (1 << BIO_RW_UNPLUG
);
747 #elif defined(REQ_UNPLUG)
756 #if defined(HAVE_BLK_QUEUE_HAVE_BIO_RW_UNPLUG)
757 flags
= (1 << BIO_RW_UNPLUG
);
758 #elif defined(REQ_UNPLUG)
766 zio
->io_error
= SET_ERROR(ENOTSUP
);
771 zio
->io_target_timestamp
= zio_handle_io_delay(zio
);
772 error
= __vdev_disk_physio(vd
->vd_bdev
, zio
, NULL
,
773 zio
->io_size
, zio
->io_offset
, rw
, flags
);
775 zio
->io_error
= error
;
782 vdev_disk_io_done(zio_t
*zio
)
785 * If the device returned EIO, we revalidate the media. If it is
786 * determined the media has changed this triggers the asynchronous
787 * removal of the device from the configuration.
789 if (zio
->io_error
== EIO
) {
790 vdev_t
*v
= zio
->io_vd
;
791 vdev_disk_t
*vd
= v
->vdev_tsd
;
793 if (check_disk_change(vd
->vd_bdev
)) {
794 vdev_bdev_invalidate(vd
->vd_bdev
);
795 v
->vdev_remove_wanted
= B_TRUE
;
796 spa_async_request(zio
->io_spa
, SPA_ASYNC_REMOVE
);
802 vdev_disk_hold(vdev_t
*vd
)
804 ASSERT(spa_config_held(vd
->vdev_spa
, SCL_STATE
, RW_WRITER
));
806 /* We must have a pathname, and it must be absolute. */
807 if (vd
->vdev_path
== NULL
|| vd
->vdev_path
[0] != '/')
811 * Only prefetch path and devid info if the device has
814 if (vd
->vdev_tsd
!= NULL
)
817 /* XXX: Implement me as a vnode lookup for the device */
818 vd
->vdev_name_vp
= NULL
;
819 vd
->vdev_devid_vp
= NULL
;
823 vdev_disk_rele(vdev_t
*vd
)
825 ASSERT(spa_config_held(vd
->vdev_spa
, SCL_STATE
, RW_WRITER
));
827 /* XXX: Implement me as a vnode rele for the device */
830 vdev_ops_t vdev_disk_ops
= {
839 VDEV_TYPE_DISK
, /* name of this vdev type */
840 B_TRUE
/* leaf vdev */
843 module_param(zfs_vdev_scheduler
, charp
, 0644);
844 MODULE_PARM_DESC(zfs_vdev_scheduler
, "I/O scheduler");