xref: /illumos-gate/usr/src/uts/common/fs/zfs/zvol.c (revision c08b16378bf1d808956fc23b8c8ac30f3172a034)
1 /*
2  * CDDL HEADER START
3  *
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.
7  *
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.
12  *
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]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23  *
24  * Portions Copyright 2010 Robert Milkowski
25  *
26  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
27  */
28 
29 /*
30  * ZFS volume emulation driver.
31  *
32  * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
33  * Volumes are accessed through the symbolic links named:
34  *
35  * /dev/zvol/dsk/<pool_name>/<dataset_name>
36  * /dev/zvol/rdsk/<pool_name>/<dataset_name>
37  *
38  * These links are created by the /dev filesystem (sdev_zvolops.c).
39  * Volumes are persistent through reboot.  No user command needs to be
40  * run before opening and using a device.
41  */
42 
43 #include <sys/types.h>
44 #include <sys/param.h>
45 #include <sys/errno.h>
46 #include <sys/uio.h>
47 #include <sys/buf.h>
48 #include <sys/modctl.h>
49 #include <sys/open.h>
50 #include <sys/kmem.h>
51 #include <sys/conf.h>
52 #include <sys/cmn_err.h>
53 #include <sys/stat.h>
54 #include <sys/zap.h>
55 #include <sys/spa.h>
56 #include <sys/zio.h>
57 #include <sys/dmu_traverse.h>
58 #include <sys/dnode.h>
59 #include <sys/dsl_dataset.h>
60 #include <sys/dsl_prop.h>
61 #include <sys/dkio.h>
62 #include <sys/efi_partition.h>
63 #include <sys/byteorder.h>
64 #include <sys/pathname.h>
65 #include <sys/ddi.h>
66 #include <sys/sunddi.h>
67 #include <sys/crc32.h>
68 #include <sys/dirent.h>
69 #include <sys/policy.h>
70 #include <sys/fs/zfs.h>
71 #include <sys/zfs_ioctl.h>
72 #include <sys/mkdev.h>
73 #include <sys/zil.h>
74 #include <sys/refcount.h>
75 #include <sys/zfs_znode.h>
76 #include <sys/zfs_rlock.h>
77 #include <sys/vdev_disk.h>
78 #include <sys/vdev_impl.h>
79 #include <sys/zvol.h>
80 #include <sys/dumphdr.h>
81 #include <sys/zil_impl.h>
82 
83 #include "zfs_namecheck.h"
84 
85 void *zfsdev_state;
86 static char *zvol_tag = "zvol_tag";
87 
88 #define	ZVOL_DUMPSIZE		"dumpsize"
89 
90 /*
91  * This lock protects the zfsdev_state structure from being modified
92  * while it's being used, e.g. an open that comes in before a create
93  * finishes.  It also protects temporary opens of the dataset so that,
94  * e.g., an open doesn't get a spurious EBUSY.
95  */
96 kmutex_t zfsdev_state_lock;
97 static uint32_t zvol_minors;
98 
99 typedef struct zvol_extent {
100 	list_node_t	ze_node;
101 	dva_t		ze_dva;		/* dva associated with this extent */
102 	uint64_t	ze_nblks;	/* number of blocks in extent */
103 } zvol_extent_t;
104 
105 /*
106  * The in-core state of each volume.
107  */
108 typedef struct zvol_state {
109 	char		zv_name[MAXPATHLEN]; /* pool/dd name */
110 	uint64_t	zv_volsize;	/* amount of space we advertise */
111 	uint64_t	zv_volblocksize; /* volume block size */
112 	minor_t		zv_minor;	/* minor number */
113 	uint8_t		zv_min_bs;	/* minimum addressable block shift */
114 	uint8_t		zv_flags;	/* readonly, dumpified, etc. */
115 	objset_t	*zv_objset;	/* objset handle */
116 	uint32_t	zv_open_count[OTYPCNT];	/* open counts */
117 	uint32_t	zv_total_opens;	/* total open count */
118 	zilog_t		*zv_zilog;	/* ZIL handle */
119 	list_t		zv_extents;	/* List of extents for dump */
120 	znode_t		zv_znode;	/* for range locking */
121 	dmu_buf_t	*zv_dbuf;	/* bonus handle */
122 } zvol_state_t;
123 
124 /*
125  * zvol specific flags
126  */
127 #define	ZVOL_RDONLY	0x1
128 #define	ZVOL_DUMPIFIED	0x2
129 #define	ZVOL_EXCL	0x4
130 #define	ZVOL_WCE	0x8
131 
132 /*
133  * zvol maximum transfer in one DMU tx.
134  */
135 int zvol_maxphys = DMU_MAX_ACCESS/2;
136 
137 extern int zfs_set_prop_nvlist(const char *, zprop_source_t,
138     nvlist_t *, nvlist_t **);
139 static int zvol_remove_zv(zvol_state_t *);
140 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio);
141 static int zvol_dumpify(zvol_state_t *zv);
142 static int zvol_dump_fini(zvol_state_t *zv);
143 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
144 
145 static void
146 zvol_size_changed(uint64_t volsize, major_t maj, minor_t min)
147 {
148 	dev_t dev = makedevice(maj, min);
149 
150 	VERIFY(ddi_prop_update_int64(dev, zfs_dip,
151 	    "Size", volsize) == DDI_SUCCESS);
152 	VERIFY(ddi_prop_update_int64(dev, zfs_dip,
153 	    "Nblocks", lbtodb(volsize)) == DDI_SUCCESS);
154 
155 	/* Notify specfs to invalidate the cached size */
156 	spec_size_invalidate(dev, VBLK);
157 	spec_size_invalidate(dev, VCHR);
158 }
159 
160 int
161 zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
162 {
163 	if (volsize == 0)
164 		return (EINVAL);
165 
166 	if (volsize % blocksize != 0)
167 		return (EINVAL);
168 
169 #ifdef _ILP32
170 	if (volsize - 1 > SPEC_MAXOFFSET_T)
171 		return (EOVERFLOW);
172 #endif
173 	return (0);
174 }
175 
176 int
177 zvol_check_volblocksize(uint64_t volblocksize)
178 {
179 	if (volblocksize < SPA_MINBLOCKSIZE ||
180 	    volblocksize > SPA_MAXBLOCKSIZE ||
181 	    !ISP2(volblocksize))
182 		return (EDOM);
183 
184 	return (0);
185 }
186 
187 int
188 zvol_get_stats(objset_t *os, nvlist_t *nv)
189 {
190 	int error;
191 	dmu_object_info_t doi;
192 	uint64_t val;
193 
194 	error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
195 	if (error)
196 		return (error);
197 
198 	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
199 
200 	error = dmu_object_info(os, ZVOL_OBJ, &doi);
201 
202 	if (error == 0) {
203 		dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
204 		    doi.doi_data_block_size);
205 	}
206 
207 	return (error);
208 }
209 
210 static zvol_state_t *
211 zvol_minor_lookup(const char *name)
212 {
213 	minor_t minor;
214 	zvol_state_t *zv;
215 
216 	ASSERT(MUTEX_HELD(&zfsdev_state_lock));
217 
218 	for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
219 		zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
220 		if (zv == NULL)
221 			continue;
222 		if (strcmp(zv->zv_name, name) == 0)
223 			return (zv);
224 	}
225 
226 	return (NULL);
227 }
228 
229 /* extent mapping arg */
230 struct maparg {
231 	zvol_state_t	*ma_zv;
232 	uint64_t	ma_blks;
233 };
234 
235 /*ARGSUSED*/
236 static int
237 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
238     const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
239 {
240 	struct maparg *ma = arg;
241 	zvol_extent_t *ze;
242 	int bs = ma->ma_zv->zv_volblocksize;
243 
244 	if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
245 		return (0);
246 
247 	VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
248 	ma->ma_blks++;
249 
250 	/* Abort immediately if we have encountered gang blocks */
251 	if (BP_IS_GANG(bp))
252 		return (EFRAGS);
253 
254 	/*
255 	 * See if the block is at the end of the previous extent.
256 	 */
257 	ze = list_tail(&ma->ma_zv->zv_extents);
258 	if (ze &&
259 	    DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
260 	    DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
261 	    DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
262 		ze->ze_nblks++;
263 		return (0);
264 	}
265 
266 	dprintf_bp(bp, "%s", "next blkptr:");
267 
268 	/* start a new extent */
269 	ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
270 	ze->ze_dva = bp->blk_dva[0];	/* structure assignment */
271 	ze->ze_nblks = 1;
272 	list_insert_tail(&ma->ma_zv->zv_extents, ze);
273 	return (0);
274 }
275 
276 static void
277 zvol_free_extents(zvol_state_t *zv)
278 {
279 	zvol_extent_t *ze;
280 
281 	while (ze = list_head(&zv->zv_extents)) {
282 		list_remove(&zv->zv_extents, ze);
283 		kmem_free(ze, sizeof (zvol_extent_t));
284 	}
285 }
286 
287 static int
288 zvol_get_lbas(zvol_state_t *zv)
289 {
290 	objset_t *os = zv->zv_objset;
291 	struct maparg	ma;
292 	int		err;
293 
294 	ma.ma_zv = zv;
295 	ma.ma_blks = 0;
296 	zvol_free_extents(zv);
297 
298 	/* commit any in-flight changes before traversing the dataset */
299 	txg_wait_synced(dmu_objset_pool(os), 0);
300 	err = traverse_dataset(dmu_objset_ds(os), 0,
301 	    TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
302 	if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
303 		zvol_free_extents(zv);
304 		return (err ? err : EIO);
305 	}
306 
307 	return (0);
308 }
309 
310 /* ARGSUSED */
311 void
312 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
313 {
314 	zfs_creat_t *zct = arg;
315 	nvlist_t *nvprops = zct->zct_props;
316 	int error;
317 	uint64_t volblocksize, volsize;
318 
319 	VERIFY(nvlist_lookup_uint64(nvprops,
320 	    zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
321 	if (nvlist_lookup_uint64(nvprops,
322 	    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
323 		volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
324 
325 	/*
326 	 * These properties must be removed from the list so the generic
327 	 * property setting step won't apply to them.
328 	 */
329 	VERIFY(nvlist_remove_all(nvprops,
330 	    zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
331 	(void) nvlist_remove_all(nvprops,
332 	    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
333 
334 	error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
335 	    DMU_OT_NONE, 0, tx);
336 	ASSERT(error == 0);
337 
338 	error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
339 	    DMU_OT_NONE, 0, tx);
340 	ASSERT(error == 0);
341 
342 	error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
343 	ASSERT(error == 0);
344 }
345 
346 /*
347  * Replay a TX_TRUNCATE ZIL transaction if asked.  TX_TRUNCATE is how we
348  * implement DKIOCFREE/free-long-range.
349  */
350 static int
351 zvol_replay_truncate(zvol_state_t *zv, lr_truncate_t *lr, boolean_t byteswap)
352 {
353 	uint64_t offset, length;
354 
355 	if (byteswap)
356 		byteswap_uint64_array(lr, sizeof (*lr));
357 
358 	offset = lr->lr_offset;
359 	length = lr->lr_length;
360 
361 	return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length));
362 }
363 
364 /*
365  * Replay a TX_WRITE ZIL transaction that didn't get committed
366  * after a system failure
367  */
368 static int
369 zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap)
370 {
371 	objset_t *os = zv->zv_objset;
372 	char *data = (char *)(lr + 1);	/* data follows lr_write_t */
373 	uint64_t offset, length;
374 	dmu_tx_t *tx;
375 	int error;
376 
377 	if (byteswap)
378 		byteswap_uint64_array(lr, sizeof (*lr));
379 
380 	offset = lr->lr_offset;
381 	length = lr->lr_length;
382 
383 	/* If it's a dmu_sync() block, write the whole block */
384 	if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
385 		uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
386 		if (length < blocksize) {
387 			offset -= offset % blocksize;
388 			length = blocksize;
389 		}
390 	}
391 
392 	tx = dmu_tx_create(os);
393 	dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length);
394 	error = dmu_tx_assign(tx, TXG_WAIT);
395 	if (error) {
396 		dmu_tx_abort(tx);
397 	} else {
398 		dmu_write(os, ZVOL_OBJ, offset, length, data, tx);
399 		dmu_tx_commit(tx);
400 	}
401 
402 	return (error);
403 }
404 
405 /* ARGSUSED */
406 static int
407 zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap)
408 {
409 	return (ENOTSUP);
410 }
411 
412 /*
413  * Callback vectors for replaying records.
414  * Only TX_WRITE and TX_TRUNCATE are needed for zvol.
415  */
416 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
417 	zvol_replay_err,	/* 0 no such transaction type */
418 	zvol_replay_err,	/* TX_CREATE */
419 	zvol_replay_err,	/* TX_MKDIR */
420 	zvol_replay_err,	/* TX_MKXATTR */
421 	zvol_replay_err,	/* TX_SYMLINK */
422 	zvol_replay_err,	/* TX_REMOVE */
423 	zvol_replay_err,	/* TX_RMDIR */
424 	zvol_replay_err,	/* TX_LINK */
425 	zvol_replay_err,	/* TX_RENAME */
426 	zvol_replay_write,	/* TX_WRITE */
427 	zvol_replay_truncate,	/* TX_TRUNCATE */
428 	zvol_replay_err,	/* TX_SETATTR */
429 	zvol_replay_err,	/* TX_ACL */
430 	zvol_replay_err,	/* TX_CREATE_ACL */
431 	zvol_replay_err,	/* TX_CREATE_ATTR */
432 	zvol_replay_err,	/* TX_CREATE_ACL_ATTR */
433 	zvol_replay_err,	/* TX_MKDIR_ACL */
434 	zvol_replay_err,	/* TX_MKDIR_ATTR */
435 	zvol_replay_err,	/* TX_MKDIR_ACL_ATTR */
436 	zvol_replay_err,	/* TX_WRITE2 */
437 };
438 
439 int
440 zvol_name2minor(const char *name, minor_t *minor)
441 {
442 	zvol_state_t *zv;
443 
444 	mutex_enter(&zfsdev_state_lock);
445 	zv = zvol_minor_lookup(name);
446 	if (minor && zv)
447 		*minor = zv->zv_minor;
448 	mutex_exit(&zfsdev_state_lock);
449 	return (zv ? 0 : -1);
450 }
451 
452 /*
453  * Create a minor node (plus a whole lot more) for the specified volume.
454  */
455 int
456 zvol_create_minor(const char *name)
457 {
458 	zfs_soft_state_t *zs;
459 	zvol_state_t *zv;
460 	objset_t *os;
461 	dmu_object_info_t doi;
462 	minor_t minor = 0;
463 	char chrbuf[30], blkbuf[30];
464 	int error;
465 
466 	mutex_enter(&zfsdev_state_lock);
467 
468 	if (zvol_minor_lookup(name) != NULL) {
469 		mutex_exit(&zfsdev_state_lock);
470 		return (EEXIST);
471 	}
472 
473 	/* lie and say we're read-only */
474 	error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os);
475 
476 	if (error) {
477 		mutex_exit(&zfsdev_state_lock);
478 		return (error);
479 	}
480 
481 	if ((minor = zfsdev_minor_alloc()) == 0) {
482 		dmu_objset_disown(os, FTAG);
483 		mutex_exit(&zfsdev_state_lock);
484 		return (ENXIO);
485 	}
486 
487 	if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) {
488 		dmu_objset_disown(os, FTAG);
489 		mutex_exit(&zfsdev_state_lock);
490 		return (EAGAIN);
491 	}
492 	(void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
493 	    (char *)name);
494 
495 	(void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor);
496 
497 	if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
498 	    minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
499 		ddi_soft_state_free(zfsdev_state, minor);
500 		dmu_objset_disown(os, FTAG);
501 		mutex_exit(&zfsdev_state_lock);
502 		return (EAGAIN);
503 	}
504 
505 	(void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor);
506 
507 	if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
508 	    minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
509 		ddi_remove_minor_node(zfs_dip, chrbuf);
510 		ddi_soft_state_free(zfsdev_state, minor);
511 		dmu_objset_disown(os, FTAG);
512 		mutex_exit(&zfsdev_state_lock);
513 		return (EAGAIN);
514 	}
515 
516 	zs = ddi_get_soft_state(zfsdev_state, minor);
517 	zs->zss_type = ZSST_ZVOL;
518 	zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
519 	(void) strlcpy(zv->zv_name, name, MAXPATHLEN);
520 	zv->zv_min_bs = DEV_BSHIFT;
521 	zv->zv_minor = minor;
522 	zv->zv_objset = os;
523 	if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os)))
524 		zv->zv_flags |= ZVOL_RDONLY;
525 	mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL);
526 	avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare,
527 	    sizeof (rl_t), offsetof(rl_t, r_node));
528 	list_create(&zv->zv_extents, sizeof (zvol_extent_t),
529 	    offsetof(zvol_extent_t, ze_node));
530 	/* get and cache the blocksize */
531 	error = dmu_object_info(os, ZVOL_OBJ, &doi);
532 	ASSERT(error == 0);
533 	zv->zv_volblocksize = doi.doi_data_block_size;
534 
535 	if (spa_writeable(dmu_objset_spa(os))) {
536 		if (zil_replay_disable)
537 			zil_destroy(dmu_objset_zil(os), B_FALSE);
538 		else
539 			zil_replay(os, zv, zvol_replay_vector);
540 	}
541 	dmu_objset_disown(os, FTAG);
542 	zv->zv_objset = NULL;
543 
544 	zvol_minors++;
545 
546 	mutex_exit(&zfsdev_state_lock);
547 
548 	return (0);
549 }
550 
551 /*
552  * Remove minor node for the specified volume.
553  */
554 static int
555 zvol_remove_zv(zvol_state_t *zv)
556 {
557 	char nmbuf[20];
558 	minor_t minor = zv->zv_minor;
559 
560 	ASSERT(MUTEX_HELD(&zfsdev_state_lock));
561 	if (zv->zv_total_opens != 0)
562 		return (EBUSY);
563 
564 	(void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor);
565 	ddi_remove_minor_node(zfs_dip, nmbuf);
566 
567 	(void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor);
568 	ddi_remove_minor_node(zfs_dip, nmbuf);
569 
570 	avl_destroy(&zv->zv_znode.z_range_avl);
571 	mutex_destroy(&zv->zv_znode.z_range_lock);
572 
573 	kmem_free(zv, sizeof (zvol_state_t));
574 
575 	ddi_soft_state_free(zfsdev_state, minor);
576 
577 	zvol_minors--;
578 	return (0);
579 }
580 
581 int
582 zvol_remove_minor(const char *name)
583 {
584 	zvol_state_t *zv;
585 	int rc;
586 
587 	mutex_enter(&zfsdev_state_lock);
588 	if ((zv = zvol_minor_lookup(name)) == NULL) {
589 		mutex_exit(&zfsdev_state_lock);
590 		return (ENXIO);
591 	}
592 	rc = zvol_remove_zv(zv);
593 	mutex_exit(&zfsdev_state_lock);
594 	return (rc);
595 }
596 
597 int
598 zvol_first_open(zvol_state_t *zv)
599 {
600 	objset_t *os;
601 	uint64_t volsize;
602 	int error;
603 	uint64_t readonly;
604 
605 	/* lie and say we're read-only */
606 	error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE,
607 	    zvol_tag, &os);
608 	if (error)
609 		return (error);
610 
611 	error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
612 	if (error) {
613 		ASSERT(error == 0);
614 		dmu_objset_disown(os, zvol_tag);
615 		return (error);
616 	}
617 	zv->zv_objset = os;
618 	error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf);
619 	if (error) {
620 		dmu_objset_disown(os, zvol_tag);
621 		return (error);
622 	}
623 	zv->zv_volsize = volsize;
624 	zv->zv_zilog = zil_open(os, zvol_get_data);
625 	zvol_size_changed(zv->zv_volsize, ddi_driver_major(zfs_dip),
626 	    zv->zv_minor);
627 
628 	VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly,
629 	    NULL) == 0);
630 	if (readonly || dmu_objset_is_snapshot(os) ||
631 	    !spa_writeable(dmu_objset_spa(os)))
632 		zv->zv_flags |= ZVOL_RDONLY;
633 	else
634 		zv->zv_flags &= ~ZVOL_RDONLY;
635 	return (error);
636 }
637 
638 void
639 zvol_last_close(zvol_state_t *zv)
640 {
641 	zil_close(zv->zv_zilog);
642 	zv->zv_zilog = NULL;
643 	dmu_buf_rele(zv->zv_dbuf, zvol_tag);
644 	zv->zv_dbuf = NULL;
645 	dmu_objset_disown(zv->zv_objset, zvol_tag);
646 	zv->zv_objset = NULL;
647 }
648 
649 int
650 zvol_prealloc(zvol_state_t *zv)
651 {
652 	objset_t *os = zv->zv_objset;
653 	dmu_tx_t *tx;
654 	uint64_t refd, avail, usedobjs, availobjs;
655 	uint64_t resid = zv->zv_volsize;
656 	uint64_t off = 0;
657 
658 	/* Check the space usage before attempting to allocate the space */
659 	dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
660 	if (avail < zv->zv_volsize)
661 		return (ENOSPC);
662 
663 	/* Free old extents if they exist */
664 	zvol_free_extents(zv);
665 
666 	while (resid != 0) {
667 		int error;
668 		uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE);
669 
670 		tx = dmu_tx_create(os);
671 		dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
672 		error = dmu_tx_assign(tx, TXG_WAIT);
673 		if (error) {
674 			dmu_tx_abort(tx);
675 			(void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
676 			return (error);
677 		}
678 		dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
679 		dmu_tx_commit(tx);
680 		off += bytes;
681 		resid -= bytes;
682 	}
683 	txg_wait_synced(dmu_objset_pool(os), 0);
684 
685 	return (0);
686 }
687 
688 int
689 zvol_update_volsize(objset_t *os, uint64_t volsize)
690 {
691 	dmu_tx_t *tx;
692 	int error;
693 
694 	ASSERT(MUTEX_HELD(&zfsdev_state_lock));
695 
696 	tx = dmu_tx_create(os);
697 	dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
698 	error = dmu_tx_assign(tx, TXG_WAIT);
699 	if (error) {
700 		dmu_tx_abort(tx);
701 		return (error);
702 	}
703 
704 	error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1,
705 	    &volsize, tx);
706 	dmu_tx_commit(tx);
707 
708 	if (error == 0)
709 		error = dmu_free_long_range(os,
710 		    ZVOL_OBJ, volsize, DMU_OBJECT_END);
711 	return (error);
712 }
713 
714 void
715 zvol_remove_minors(const char *name)
716 {
717 	zvol_state_t *zv;
718 	char *namebuf;
719 	minor_t minor;
720 
721 	namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP);
722 	(void) strncpy(namebuf, name, strlen(name));
723 	(void) strcat(namebuf, "/");
724 	mutex_enter(&zfsdev_state_lock);
725 	for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
726 
727 		zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
728 		if (zv == NULL)
729 			continue;
730 		if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0)
731 			(void) zvol_remove_zv(zv);
732 	}
733 	kmem_free(namebuf, strlen(name) + 2);
734 
735 	mutex_exit(&zfsdev_state_lock);
736 }
737 
738 int
739 zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
740 {
741 	zvol_state_t *zv = NULL;
742 	objset_t *os;
743 	int error;
744 	dmu_object_info_t doi;
745 	uint64_t old_volsize = 0ULL;
746 	uint64_t readonly;
747 
748 	mutex_enter(&zfsdev_state_lock);
749 	zv = zvol_minor_lookup(name);
750 	if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
751 		mutex_exit(&zfsdev_state_lock);
752 		return (error);
753 	}
754 
755 	if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 ||
756 	    (error = zvol_check_volsize(volsize,
757 	    doi.doi_data_block_size)) != 0)
758 		goto out;
759 
760 	VERIFY(dsl_prop_get_integer(name, "readonly", &readonly,
761 	    NULL) == 0);
762 	if (readonly) {
763 		error = EROFS;
764 		goto out;
765 	}
766 
767 	error = zvol_update_volsize(os, volsize);
768 	/*
769 	 * Reinitialize the dump area to the new size. If we
770 	 * failed to resize the dump area then restore it back to
771 	 * its original size.
772 	 */
773 	if (zv && error == 0) {
774 		if (zv->zv_flags & ZVOL_DUMPIFIED) {
775 			old_volsize = zv->zv_volsize;
776 			zv->zv_volsize = volsize;
777 			if ((error = zvol_dumpify(zv)) != 0 ||
778 			    (error = dumpvp_resize()) != 0) {
779 				(void) zvol_update_volsize(os, old_volsize);
780 				zv->zv_volsize = old_volsize;
781 				error = zvol_dumpify(zv);
782 			}
783 		}
784 		if (error == 0) {
785 			zv->zv_volsize = volsize;
786 			zvol_size_changed(volsize, maj, zv->zv_minor);
787 		}
788 	}
789 
790 	/*
791 	 * Generate a LUN expansion event.
792 	 */
793 	if (zv && error == 0) {
794 		sysevent_id_t eid;
795 		nvlist_t *attr;
796 		char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
797 
798 		(void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV,
799 		    zv->zv_minor);
800 
801 		VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
802 		VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
803 
804 		(void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
805 		    ESC_DEV_DLE, attr, &eid, DDI_SLEEP);
806 
807 		nvlist_free(attr);
808 		kmem_free(physpath, MAXPATHLEN);
809 	}
810 
811 out:
812 	dmu_objset_rele(os, FTAG);
813 
814 	mutex_exit(&zfsdev_state_lock);
815 
816 	return (error);
817 }
818 
819 /*ARGSUSED*/
820 int
821 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr)
822 {
823 	zvol_state_t *zv;
824 	int err = 0;
825 
826 	mutex_enter(&zfsdev_state_lock);
827 
828 	zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL);
829 	if (zv == NULL) {
830 		mutex_exit(&zfsdev_state_lock);
831 		return (ENXIO);
832 	}
833 
834 	if (zv->zv_total_opens == 0)
835 		err = zvol_first_open(zv);
836 	if (err) {
837 		mutex_exit(&zfsdev_state_lock);
838 		return (err);
839 	}
840 	if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
841 		err = EROFS;
842 		goto out;
843 	}
844 	if (zv->zv_flags & ZVOL_EXCL) {
845 		err = EBUSY;
846 		goto out;
847 	}
848 	if (flag & FEXCL) {
849 		if (zv->zv_total_opens != 0) {
850 			err = EBUSY;
851 			goto out;
852 		}
853 		zv->zv_flags |= ZVOL_EXCL;
854 	}
855 
856 	if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) {
857 		zv->zv_open_count[otyp]++;
858 		zv->zv_total_opens++;
859 	}
860 	mutex_exit(&zfsdev_state_lock);
861 
862 	return (err);
863 out:
864 	if (zv->zv_total_opens == 0)
865 		zvol_last_close(zv);
866 	mutex_exit(&zfsdev_state_lock);
867 	return (err);
868 }
869 
870 /*ARGSUSED*/
871 int
872 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr)
873 {
874 	minor_t minor = getminor(dev);
875 	zvol_state_t *zv;
876 	int error = 0;
877 
878 	mutex_enter(&zfsdev_state_lock);
879 
880 	zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
881 	if (zv == NULL) {
882 		mutex_exit(&zfsdev_state_lock);
883 		return (ENXIO);
884 	}
885 
886 	if (zv->zv_flags & ZVOL_EXCL) {
887 		ASSERT(zv->zv_total_opens == 1);
888 		zv->zv_flags &= ~ZVOL_EXCL;
889 	}
890 
891 	/*
892 	 * If the open count is zero, this is a spurious close.
893 	 * That indicates a bug in the kernel / DDI framework.
894 	 */
895 	ASSERT(zv->zv_open_count[otyp] != 0);
896 	ASSERT(zv->zv_total_opens != 0);
897 
898 	/*
899 	 * You may get multiple opens, but only one close.
900 	 */
901 	zv->zv_open_count[otyp]--;
902 	zv->zv_total_opens--;
903 
904 	if (zv->zv_total_opens == 0)
905 		zvol_last_close(zv);
906 
907 	mutex_exit(&zfsdev_state_lock);
908 	return (error);
909 }
910 
911 static void
912 zvol_get_done(zgd_t *zgd, int error)
913 {
914 	if (zgd->zgd_db)
915 		dmu_buf_rele(zgd->zgd_db, zgd);
916 
917 	zfs_range_unlock(zgd->zgd_rl);
918 
919 	if (error == 0 && zgd->zgd_bp)
920 		zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
921 
922 	kmem_free(zgd, sizeof (zgd_t));
923 }
924 
925 /*
926  * Get data to generate a TX_WRITE intent log record.
927  */
928 static int
929 zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
930 {
931 	zvol_state_t *zv = arg;
932 	objset_t *os = zv->zv_objset;
933 	uint64_t object = ZVOL_OBJ;
934 	uint64_t offset = lr->lr_offset;
935 	uint64_t size = lr->lr_length;	/* length of user data */
936 	blkptr_t *bp = &lr->lr_blkptr;
937 	dmu_buf_t *db;
938 	zgd_t *zgd;
939 	int error;
940 
941 	ASSERT(zio != NULL);
942 	ASSERT(size != 0);
943 
944 	zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
945 	zgd->zgd_zilog = zv->zv_zilog;
946 	zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER);
947 
948 	/*
949 	 * Write records come in two flavors: immediate and indirect.
950 	 * For small writes it's cheaper to store the data with the
951 	 * log record (immediate); for large writes it's cheaper to
952 	 * sync the data and get a pointer to it (indirect) so that
953 	 * we don't have to write the data twice.
954 	 */
955 	if (buf != NULL) {	/* immediate write */
956 		error = dmu_read(os, object, offset, size, buf,
957 		    DMU_READ_NO_PREFETCH);
958 	} else {
959 		size = zv->zv_volblocksize;
960 		offset = P2ALIGN(offset, size);
961 		error = dmu_buf_hold(os, object, offset, zgd, &db,
962 		    DMU_READ_NO_PREFETCH);
963 		if (error == 0) {
964 			zgd->zgd_db = db;
965 			zgd->zgd_bp = bp;
966 
967 			ASSERT(db->db_offset == offset);
968 			ASSERT(db->db_size == size);
969 
970 			error = dmu_sync(zio, lr->lr_common.lrc_txg,
971 			    zvol_get_done, zgd);
972 
973 			if (error == 0)
974 				return (0);
975 		}
976 	}
977 
978 	zvol_get_done(zgd, error);
979 
980 	return (error);
981 }
982 
983 /*
984  * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
985  *
986  * We store data in the log buffers if it's small enough.
987  * Otherwise we will later flush the data out via dmu_sync().
988  */
989 ssize_t zvol_immediate_write_sz = 32768;
990 
991 static void
992 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid,
993     boolean_t sync)
994 {
995 	uint32_t blocksize = zv->zv_volblocksize;
996 	zilog_t *zilog = zv->zv_zilog;
997 	boolean_t slogging;
998 	ssize_t immediate_write_sz;
999 
1000 	if (zil_replaying(zilog, tx))
1001 		return;
1002 
1003 	immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
1004 	    ? 0 : zvol_immediate_write_sz;
1005 
1006 	slogging = spa_has_slogs(zilog->zl_spa) &&
1007 	    (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY);
1008 
1009 	while (resid) {
1010 		itx_t *itx;
1011 		lr_write_t *lr;
1012 		ssize_t len;
1013 		itx_wr_state_t write_state;
1014 
1015 		/*
1016 		 * Unlike zfs_log_write() we can be called with
1017 		 * upto DMU_MAX_ACCESS/2 (5MB) writes.
1018 		 */
1019 		if (blocksize > immediate_write_sz && !slogging &&
1020 		    resid >= blocksize && off % blocksize == 0) {
1021 			write_state = WR_INDIRECT; /* uses dmu_sync */
1022 			len = blocksize;
1023 		} else if (sync) {
1024 			write_state = WR_COPIED;
1025 			len = MIN(ZIL_MAX_LOG_DATA, resid);
1026 		} else {
1027 			write_state = WR_NEED_COPY;
1028 			len = MIN(ZIL_MAX_LOG_DATA, resid);
1029 		}
1030 
1031 		itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
1032 		    (write_state == WR_COPIED ? len : 0));
1033 		lr = (lr_write_t *)&itx->itx_lr;
1034 		if (write_state == WR_COPIED && dmu_read(zv->zv_objset,
1035 		    ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) {
1036 			zil_itx_destroy(itx);
1037 			itx = zil_itx_create(TX_WRITE, sizeof (*lr));
1038 			lr = (lr_write_t *)&itx->itx_lr;
1039 			write_state = WR_NEED_COPY;
1040 		}
1041 
1042 		itx->itx_wr_state = write_state;
1043 		if (write_state == WR_NEED_COPY)
1044 			itx->itx_sod += len;
1045 		lr->lr_foid = ZVOL_OBJ;
1046 		lr->lr_offset = off;
1047 		lr->lr_length = len;
1048 		lr->lr_blkoff = 0;
1049 		BP_ZERO(&lr->lr_blkptr);
1050 
1051 		itx->itx_private = zv;
1052 		itx->itx_sync = sync;
1053 
1054 		zil_itx_assign(zilog, itx, tx);
1055 
1056 		off += len;
1057 		resid -= len;
1058 	}
1059 }
1060 
1061 static int
1062 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size,
1063     boolean_t doread, boolean_t isdump)
1064 {
1065 	vdev_disk_t *dvd;
1066 	int c;
1067 	int numerrors = 0;
1068 
1069 	for (c = 0; c < vd->vdev_children; c++) {
1070 		ASSERT(vd->vdev_ops == &vdev_mirror_ops ||
1071 		    vd->vdev_ops == &vdev_replacing_ops ||
1072 		    vd->vdev_ops == &vdev_spare_ops);
1073 		int err = zvol_dumpio_vdev(vd->vdev_child[c],
1074 		    addr, offset, size, doread, isdump);
1075 		if (err != 0) {
1076 			numerrors++;
1077 		} else if (doread) {
1078 			break;
1079 		}
1080 	}
1081 
1082 	if (!vd->vdev_ops->vdev_op_leaf)
1083 		return (numerrors < vd->vdev_children ? 0 : EIO);
1084 
1085 	if (doread && !vdev_readable(vd))
1086 		return (EIO);
1087 	else if (!doread && !vdev_writeable(vd))
1088 		return (EIO);
1089 
1090 	dvd = vd->vdev_tsd;
1091 	ASSERT3P(dvd, !=, NULL);
1092 	offset += VDEV_LABEL_START_SIZE;
1093 
1094 	if (ddi_in_panic() || isdump) {
1095 		ASSERT(!doread);
1096 		if (doread)
1097 			return (EIO);
1098 		return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
1099 		    lbtodb(size)));
1100 	} else {
1101 		return (vdev_disk_physio(dvd->vd_lh, addr, size, offset,
1102 		    doread ? B_READ : B_WRITE));
1103 	}
1104 }
1105 
1106 static int
1107 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
1108     boolean_t doread, boolean_t isdump)
1109 {
1110 	vdev_t *vd;
1111 	int error;
1112 	zvol_extent_t *ze;
1113 	spa_t *spa = dmu_objset_spa(zv->zv_objset);
1114 
1115 	/* Must be sector aligned, and not stradle a block boundary. */
1116 	if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
1117 	    P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
1118 		return (EINVAL);
1119 	}
1120 	ASSERT(size <= zv->zv_volblocksize);
1121 
1122 	/* Locate the extent this belongs to */
1123 	ze = list_head(&zv->zv_extents);
1124 	while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
1125 		offset -= ze->ze_nblks * zv->zv_volblocksize;
1126 		ze = list_next(&zv->zv_extents, ze);
1127 	}
1128 
1129 	if (!ddi_in_panic())
1130 		spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
1131 
1132 	vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
1133 	offset += DVA_GET_OFFSET(&ze->ze_dva);
1134 	error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump);
1135 
1136 	if (!ddi_in_panic())
1137 		spa_config_exit(spa, SCL_STATE, FTAG);
1138 
1139 	return (error);
1140 }
1141 
1142 int
1143 zvol_strategy(buf_t *bp)
1144 {
1145 	zfs_soft_state_t *zs = NULL;
1146 	zvol_state_t *zv;
1147 	uint64_t off, volsize;
1148 	size_t resid;
1149 	char *addr;
1150 	objset_t *os;
1151 	rl_t *rl;
1152 	int error = 0;
1153 	boolean_t doread = bp->b_flags & B_READ;
1154 	boolean_t is_dump;
1155 	boolean_t sync;
1156 
1157 	if (getminor(bp->b_edev) == 0) {
1158 		error = EINVAL;
1159 	} else {
1160 		zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev));
1161 		if (zs == NULL)
1162 			error = ENXIO;
1163 		else if (zs->zss_type != ZSST_ZVOL)
1164 			error = EINVAL;
1165 	}
1166 
1167 	if (error) {
1168 		bioerror(bp, error);
1169 		biodone(bp);
1170 		return (0);
1171 	}
1172 
1173 	zv = zs->zss_data;
1174 
1175 	if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) {
1176 		bioerror(bp, EROFS);
1177 		biodone(bp);
1178 		return (0);
1179 	}
1180 
1181 	off = ldbtob(bp->b_blkno);
1182 	volsize = zv->zv_volsize;
1183 
1184 	os = zv->zv_objset;
1185 	ASSERT(os != NULL);
1186 
1187 	bp_mapin(bp);
1188 	addr = bp->b_un.b_addr;
1189 	resid = bp->b_bcount;
1190 
1191 	if (resid > 0 && (off < 0 || off >= volsize)) {
1192 		bioerror(bp, EIO);
1193 		biodone(bp);
1194 		return (0);
1195 	}
1196 
1197 	is_dump = zv->zv_flags & ZVOL_DUMPIFIED;
1198 	sync = ((!(bp->b_flags & B_ASYNC) &&
1199 	    !(zv->zv_flags & ZVOL_WCE)) ||
1200 	    (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) &&
1201 	    !doread && !is_dump;
1202 
1203 	/*
1204 	 * There must be no buffer changes when doing a dmu_sync() because
1205 	 * we can't change the data whilst calculating the checksum.
1206 	 */
1207 	rl = zfs_range_lock(&zv->zv_znode, off, resid,
1208 	    doread ? RL_READER : RL_WRITER);
1209 
1210 	while (resid != 0 && off < volsize) {
1211 		size_t size = MIN(resid, zvol_maxphys);
1212 		if (is_dump) {
1213 			size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
1214 			error = zvol_dumpio(zv, addr, off, size,
1215 			    doread, B_FALSE);
1216 		} else if (doread) {
1217 			error = dmu_read(os, ZVOL_OBJ, off, size, addr,
1218 			    DMU_READ_PREFETCH);
1219 		} else {
1220 			dmu_tx_t *tx = dmu_tx_create(os);
1221 			dmu_tx_hold_write(tx, ZVOL_OBJ, off, size);
1222 			error = dmu_tx_assign(tx, TXG_WAIT);
1223 			if (error) {
1224 				dmu_tx_abort(tx);
1225 			} else {
1226 				dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
1227 				zvol_log_write(zv, tx, off, size, sync);
1228 				dmu_tx_commit(tx);
1229 			}
1230 		}
1231 		if (error) {
1232 			/* convert checksum errors into IO errors */
1233 			if (error == ECKSUM)
1234 				error = EIO;
1235 			break;
1236 		}
1237 		off += size;
1238 		addr += size;
1239 		resid -= size;
1240 	}
1241 	zfs_range_unlock(rl);
1242 
1243 	if ((bp->b_resid = resid) == bp->b_bcount)
1244 		bioerror(bp, off > volsize ? EINVAL : error);
1245 
1246 	if (sync)
1247 		zil_commit(zv->zv_zilog, ZVOL_OBJ);
1248 	biodone(bp);
1249 
1250 	return (0);
1251 }
1252 
1253 /*
1254  * Set the buffer count to the zvol maximum transfer.
1255  * Using our own routine instead of the default minphys()
1256  * means that for larger writes we write bigger buffers on X86
1257  * (128K instead of 56K) and flush the disk write cache less often
1258  * (every zvol_maxphys - currently 1MB) instead of minphys (currently
1259  * 56K on X86 and 128K on sparc).
1260  */
1261 void
1262 zvol_minphys(struct buf *bp)
1263 {
1264 	if (bp->b_bcount > zvol_maxphys)
1265 		bp->b_bcount = zvol_maxphys;
1266 }
1267 
1268 int
1269 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
1270 {
1271 	minor_t minor = getminor(dev);
1272 	zvol_state_t *zv;
1273 	int error = 0;
1274 	uint64_t size;
1275 	uint64_t boff;
1276 	uint64_t resid;
1277 
1278 	zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1279 	if (zv == NULL)
1280 		return (ENXIO);
1281 
1282 	boff = ldbtob(blkno);
1283 	resid = ldbtob(nblocks);
1284 
1285 	VERIFY3U(boff + resid, <=, zv->zv_volsize);
1286 
1287 	while (resid) {
1288 		size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
1289 		error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
1290 		if (error)
1291 			break;
1292 		boff += size;
1293 		addr += size;
1294 		resid -= size;
1295 	}
1296 
1297 	return (error);
1298 }
1299 
1300 /*ARGSUSED*/
1301 int
1302 zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
1303 {
1304 	minor_t minor = getminor(dev);
1305 	zvol_state_t *zv;
1306 	uint64_t volsize;
1307 	rl_t *rl;
1308 	int error = 0;
1309 
1310 	zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1311 	if (zv == NULL)
1312 		return (ENXIO);
1313 
1314 	volsize = zv->zv_volsize;
1315 	if (uio->uio_resid > 0 &&
1316 	    (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
1317 		return (EIO);
1318 
1319 	if (zv->zv_flags & ZVOL_DUMPIFIED) {
1320 		error = physio(zvol_strategy, NULL, dev, B_READ,
1321 		    zvol_minphys, uio);
1322 		return (error);
1323 	}
1324 
1325 	rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1326 	    RL_READER);
1327 	while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1328 		uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1329 
1330 		/* don't read past the end */
1331 		if (bytes > volsize - uio->uio_loffset)
1332 			bytes = volsize - uio->uio_loffset;
1333 
1334 		error =  dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes);
1335 		if (error) {
1336 			/* convert checksum errors into IO errors */
1337 			if (error == ECKSUM)
1338 				error = EIO;
1339 			break;
1340 		}
1341 	}
1342 	zfs_range_unlock(rl);
1343 	return (error);
1344 }
1345 
1346 /*ARGSUSED*/
1347 int
1348 zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
1349 {
1350 	minor_t minor = getminor(dev);
1351 	zvol_state_t *zv;
1352 	uint64_t volsize;
1353 	rl_t *rl;
1354 	int error = 0;
1355 	boolean_t sync;
1356 
1357 	zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1358 	if (zv == NULL)
1359 		return (ENXIO);
1360 
1361 	volsize = zv->zv_volsize;
1362 	if (uio->uio_resid > 0 &&
1363 	    (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
1364 		return (EIO);
1365 
1366 	if (zv->zv_flags & ZVOL_DUMPIFIED) {
1367 		error = physio(zvol_strategy, NULL, dev, B_WRITE,
1368 		    zvol_minphys, uio);
1369 		return (error);
1370 	}
1371 
1372 	sync = !(zv->zv_flags & ZVOL_WCE) ||
1373 	    (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
1374 
1375 	rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1376 	    RL_WRITER);
1377 	while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1378 		uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1379 		uint64_t off = uio->uio_loffset;
1380 		dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1381 
1382 		if (bytes > volsize - off)	/* don't write past the end */
1383 			bytes = volsize - off;
1384 
1385 		dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
1386 		error = dmu_tx_assign(tx, TXG_WAIT);
1387 		if (error) {
1388 			dmu_tx_abort(tx);
1389 			break;
1390 		}
1391 		error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx);
1392 		if (error == 0)
1393 			zvol_log_write(zv, tx, off, bytes, sync);
1394 		dmu_tx_commit(tx);
1395 
1396 		if (error)
1397 			break;
1398 	}
1399 	zfs_range_unlock(rl);
1400 	if (sync)
1401 		zil_commit(zv->zv_zilog, ZVOL_OBJ);
1402 	return (error);
1403 }
1404 
1405 int
1406 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
1407 {
1408 	struct uuid uuid = EFI_RESERVED;
1409 	efi_gpe_t gpe = { 0 };
1410 	uint32_t crc;
1411 	dk_efi_t efi;
1412 	int length;
1413 	char *ptr;
1414 
1415 	if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
1416 		return (EFAULT);
1417 	ptr = (char *)(uintptr_t)efi.dki_data_64;
1418 	length = efi.dki_length;
1419 	/*
1420 	 * Some clients may attempt to request a PMBR for the
1421 	 * zvol.  Currently this interface will return EINVAL to
1422 	 * such requests.  These requests could be supported by
1423 	 * adding a check for lba == 0 and consing up an appropriate
1424 	 * PMBR.
1425 	 */
1426 	if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
1427 		return (EINVAL);
1428 
1429 	gpe.efi_gpe_StartingLBA = LE_64(34ULL);
1430 	gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
1431 	UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
1432 
1433 	if (efi.dki_lba == 1) {
1434 		efi_gpt_t gpt = { 0 };
1435 
1436 		gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
1437 		gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
1438 		gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
1439 		gpt.efi_gpt_MyLBA = LE_64(1ULL);
1440 		gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
1441 		gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
1442 		gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
1443 		gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
1444 		gpt.efi_gpt_SizeOfPartitionEntry =
1445 		    LE_32(sizeof (efi_gpe_t));
1446 		CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
1447 		gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
1448 		CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
1449 		gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
1450 		if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
1451 		    flag))
1452 			return (EFAULT);
1453 		ptr += sizeof (gpt);
1454 		length -= sizeof (gpt);
1455 	}
1456 	if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
1457 	    length), flag))
1458 		return (EFAULT);
1459 	return (0);
1460 }
1461 
1462 /*
1463  * BEGIN entry points to allow external callers access to the volume.
1464  */
1465 /*
1466  * Return the volume parameters needed for access from an external caller.
1467  * These values are invariant as long as the volume is held open.
1468  */
1469 int
1470 zvol_get_volume_params(minor_t minor, uint64_t *blksize,
1471     uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl,
1472     void **rl_hdl, void **bonus_hdl)
1473 {
1474 	zvol_state_t *zv;
1475 
1476 	zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1477 	if (zv == NULL)
1478 		return (ENXIO);
1479 	if (zv->zv_flags & ZVOL_DUMPIFIED)
1480 		return (ENXIO);
1481 
1482 	ASSERT(blksize && max_xfer_len && minor_hdl &&
1483 	    objset_hdl && zil_hdl && rl_hdl && bonus_hdl);
1484 
1485 	*blksize = zv->zv_volblocksize;
1486 	*max_xfer_len = (uint64_t)zvol_maxphys;
1487 	*minor_hdl = zv;
1488 	*objset_hdl = zv->zv_objset;
1489 	*zil_hdl = zv->zv_zilog;
1490 	*rl_hdl = &zv->zv_znode;
1491 	*bonus_hdl = zv->zv_dbuf;
1492 	return (0);
1493 }
1494 
1495 /*
1496  * Return the current volume size to an external caller.
1497  * The size can change while the volume is open.
1498  */
1499 uint64_t
1500 zvol_get_volume_size(void *minor_hdl)
1501 {
1502 	zvol_state_t *zv = minor_hdl;
1503 
1504 	return (zv->zv_volsize);
1505 }
1506 
1507 /*
1508  * Return the current WCE setting to an external caller.
1509  * The WCE setting can change while the volume is open.
1510  */
1511 int
1512 zvol_get_volume_wce(void *minor_hdl)
1513 {
1514 	zvol_state_t *zv = minor_hdl;
1515 
1516 	return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0);
1517 }
1518 
1519 /*
1520  * Entry point for external callers to zvol_log_write
1521  */
1522 void
1523 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid,
1524     boolean_t sync)
1525 {
1526 	zvol_state_t *zv = minor_hdl;
1527 
1528 	zvol_log_write(zv, tx, off, resid, sync);
1529 }
1530 /*
1531  * END entry points to allow external callers access to the volume.
1532  */
1533 
1534 /*
1535  * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE.
1536  */
1537 static void
1538 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len,
1539     boolean_t sync)
1540 {
1541 	itx_t *itx;
1542 	lr_truncate_t *lr;
1543 	zilog_t *zilog = zv->zv_zilog;
1544 
1545 	if (zil_replaying(zilog, tx))
1546 		return;
1547 
1548 	itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr));
1549 	lr = (lr_truncate_t *)&itx->itx_lr;
1550 	lr->lr_foid = ZVOL_OBJ;
1551 	lr->lr_offset = off;
1552 	lr->lr_length = len;
1553 
1554 	itx->itx_sync = sync;
1555 	zil_itx_assign(zilog, itx, tx);
1556 }
1557 
1558 /*
1559  * Dirtbag ioctls to support mkfs(1M) for UFS filesystems.  See dkio(7I).
1560  * Also a dirtbag dkio ioctl for unmap/free-block functionality.
1561  */
1562 /*ARGSUSED*/
1563 int
1564 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
1565 {
1566 	zvol_state_t *zv;
1567 	struct dk_cinfo dki;
1568 	struct dk_minfo dkm;
1569 	struct dk_callback *dkc;
1570 	int error = 0;
1571 	rl_t *rl;
1572 
1573 	mutex_enter(&zfsdev_state_lock);
1574 
1575 	zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL);
1576 
1577 	if (zv == NULL) {
1578 		mutex_exit(&zfsdev_state_lock);
1579 		return (ENXIO);
1580 	}
1581 	ASSERT(zv->zv_total_opens > 0);
1582 
1583 	switch (cmd) {
1584 
1585 	case DKIOCINFO:
1586 		bzero(&dki, sizeof (dki));
1587 		(void) strcpy(dki.dki_cname, "zvol");
1588 		(void) strcpy(dki.dki_dname, "zvol");
1589 		dki.dki_ctype = DKC_UNKNOWN;
1590 		dki.dki_unit = getminor(dev);
1591 		dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs);
1592 		mutex_exit(&zfsdev_state_lock);
1593 		if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
1594 			error = EFAULT;
1595 		return (error);
1596 
1597 	case DKIOCGMEDIAINFO:
1598 		bzero(&dkm, sizeof (dkm));
1599 		dkm.dki_lbsize = 1U << zv->zv_min_bs;
1600 		dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
1601 		dkm.dki_media_type = DK_UNKNOWN;
1602 		mutex_exit(&zfsdev_state_lock);
1603 		if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
1604 			error = EFAULT;
1605 		return (error);
1606 
1607 	case DKIOCGETEFI:
1608 		{
1609 			uint64_t vs = zv->zv_volsize;
1610 			uint8_t bs = zv->zv_min_bs;
1611 
1612 			mutex_exit(&zfsdev_state_lock);
1613 			error = zvol_getefi((void *)arg, flag, vs, bs);
1614 			return (error);
1615 		}
1616 
1617 	case DKIOCFLUSHWRITECACHE:
1618 		dkc = (struct dk_callback *)arg;
1619 		mutex_exit(&zfsdev_state_lock);
1620 		zil_commit(zv->zv_zilog, ZVOL_OBJ);
1621 		if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
1622 			(*dkc->dkc_callback)(dkc->dkc_cookie, error);
1623 			error = 0;
1624 		}
1625 		return (error);
1626 
1627 	case DKIOCGETWCE:
1628 		{
1629 			int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0;
1630 			if (ddi_copyout(&wce, (void *)arg, sizeof (int),
1631 			    flag))
1632 				error = EFAULT;
1633 			break;
1634 		}
1635 	case DKIOCSETWCE:
1636 		{
1637 			int wce;
1638 			if (ddi_copyin((void *)arg, &wce, sizeof (int),
1639 			    flag)) {
1640 				error = EFAULT;
1641 				break;
1642 			}
1643 			if (wce) {
1644 				zv->zv_flags |= ZVOL_WCE;
1645 				mutex_exit(&zfsdev_state_lock);
1646 			} else {
1647 				zv->zv_flags &= ~ZVOL_WCE;
1648 				mutex_exit(&zfsdev_state_lock);
1649 				zil_commit(zv->zv_zilog, ZVOL_OBJ);
1650 			}
1651 			return (0);
1652 		}
1653 
1654 	case DKIOCGGEOM:
1655 	case DKIOCGVTOC:
1656 		/*
1657 		 * commands using these (like prtvtoc) expect ENOTSUP
1658 		 * since we're emulating an EFI label
1659 		 */
1660 		error = ENOTSUP;
1661 		break;
1662 
1663 	case DKIOCDUMPINIT:
1664 		rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1665 		    RL_WRITER);
1666 		error = zvol_dumpify(zv);
1667 		zfs_range_unlock(rl);
1668 		break;
1669 
1670 	case DKIOCDUMPFINI:
1671 		if (!(zv->zv_flags & ZVOL_DUMPIFIED))
1672 			break;
1673 		rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1674 		    RL_WRITER);
1675 		error = zvol_dump_fini(zv);
1676 		zfs_range_unlock(rl);
1677 		break;
1678 
1679 	case DKIOCFREE:
1680 	{
1681 		dkioc_free_t df;
1682 		dmu_tx_t *tx;
1683 
1684 		if (ddi_copyin((void *)arg, &df, sizeof (df), flag)) {
1685 			error = EFAULT;
1686 			break;
1687 		}
1688 
1689 		/*
1690 		 * Apply Postel's Law to length-checking.  If they overshoot,
1691 		 * just blank out until the end, if there's a need to blank
1692 		 * out anything.
1693 		 */
1694 		if (df.df_start >= zv->zv_volsize)
1695 			break;	/* No need to do anything... */
1696 		if (df.df_start + df.df_length > zv->zv_volsize)
1697 			df.df_length = DMU_OBJECT_END;
1698 
1699 		rl = zfs_range_lock(&zv->zv_znode, df.df_start, df.df_length,
1700 		    RL_WRITER);
1701 		tx = dmu_tx_create(zv->zv_objset);
1702 		error = dmu_tx_assign(tx, TXG_WAIT);
1703 		if (error != 0) {
1704 			dmu_tx_abort(tx);
1705 		} else {
1706 			zvol_log_truncate(zv, tx, df.df_start,
1707 			    df.df_length, B_TRUE);
1708 			dmu_tx_commit(tx);
1709 			error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
1710 			    df.df_start, df.df_length);
1711 		}
1712 
1713 		zfs_range_unlock(rl);
1714 
1715 		if (error == 0) {
1716 			/*
1717 			 * If the write-cache is disabled or 'sync' property
1718 			 * is set to 'always' then treat this as a synchronous
1719 			 * operation (i.e. commit to zil).
1720 			 */
1721 			if (!(zv->zv_flags & ZVOL_WCE) ||
1722 			    (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS))
1723 				zil_commit(zv->zv_zilog, ZVOL_OBJ);
1724 
1725 			/*
1726 			 * If the caller really wants synchronous writes, and
1727 			 * can't wait for them, don't return until the write
1728 			 * is done.
1729 			 */
1730 			if (df.df_flags & DF_WAIT_SYNC) {
1731 				txg_wait_synced(
1732 				    dmu_objset_pool(zv->zv_objset), 0);
1733 			}
1734 		}
1735 		break;
1736 	}
1737 
1738 	default:
1739 		error = ENOTTY;
1740 		break;
1741 
1742 	}
1743 	mutex_exit(&zfsdev_state_lock);
1744 	return (error);
1745 }
1746 
1747 int
1748 zvol_busy(void)
1749 {
1750 	return (zvol_minors != 0);
1751 }
1752 
1753 void
1754 zvol_init(void)
1755 {
1756 	VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t),
1757 	    1) == 0);
1758 	mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL);
1759 }
1760 
1761 void
1762 zvol_fini(void)
1763 {
1764 	mutex_destroy(&zfsdev_state_lock);
1765 	ddi_soft_state_fini(&zfsdev_state);
1766 }
1767 
1768 static int
1769 zvol_dump_init(zvol_state_t *zv, boolean_t resize)
1770 {
1771 	dmu_tx_t *tx;
1772 	int error = 0;
1773 	objset_t *os = zv->zv_objset;
1774 	nvlist_t *nv = NULL;
1775 	uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
1776 
1777 	ASSERT(MUTEX_HELD(&zfsdev_state_lock));
1778 	error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0,
1779 	    DMU_OBJECT_END);
1780 	/* wait for dmu_free_long_range to actually free the blocks */
1781 	txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
1782 
1783 	tx = dmu_tx_create(os);
1784 	dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1785 	dmu_tx_hold_bonus(tx, ZVOL_OBJ);
1786 	error = dmu_tx_assign(tx, TXG_WAIT);
1787 	if (error) {
1788 		dmu_tx_abort(tx);
1789 		return (error);
1790 	}
1791 
1792 	/*
1793 	 * If we are resizing the dump device then we only need to
1794 	 * update the refreservation to match the newly updated
1795 	 * zvolsize. Otherwise, we save off the original state of the
1796 	 * zvol so that we can restore them if the zvol is ever undumpified.
1797 	 */
1798 	if (resize) {
1799 		error = zap_update(os, ZVOL_ZAP_OBJ,
1800 		    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
1801 		    &zv->zv_volsize, tx);
1802 	} else {
1803 		uint64_t checksum, compress, refresrv, vbs, dedup;
1804 
1805 		error = dsl_prop_get_integer(zv->zv_name,
1806 		    zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
1807 		error = error ? error : dsl_prop_get_integer(zv->zv_name,
1808 		    zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL);
1809 		error = error ? error : dsl_prop_get_integer(zv->zv_name,
1810 		    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL);
1811 		error = error ? error : dsl_prop_get_integer(zv->zv_name,
1812 		    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL);
1813 		if (version >= SPA_VERSION_DEDUP) {
1814 			error = error ? error :
1815 			    dsl_prop_get_integer(zv->zv_name,
1816 			    zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL);
1817 		}
1818 
1819 		error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1820 		    zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
1821 		    &compress, tx);
1822 		error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1823 		    zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx);
1824 		error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1825 		    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
1826 		    &refresrv, tx);
1827 		error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1828 		    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
1829 		    &vbs, tx);
1830 		error = error ? error : dmu_object_set_blocksize(
1831 		    os, ZVOL_OBJ, SPA_MAXBLOCKSIZE, 0, tx);
1832 		if (version >= SPA_VERSION_DEDUP) {
1833 			error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1834 			    zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1,
1835 			    &dedup, tx);
1836 		}
1837 		if (error == 0)
1838 			zv->zv_volblocksize = SPA_MAXBLOCKSIZE;
1839 	}
1840 	dmu_tx_commit(tx);
1841 
1842 	/*
1843 	 * We only need update the zvol's property if we are initializing
1844 	 * the dump area for the first time.
1845 	 */
1846 	if (!resize) {
1847 		VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1848 		VERIFY(nvlist_add_uint64(nv,
1849 		    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
1850 		VERIFY(nvlist_add_uint64(nv,
1851 		    zfs_prop_to_name(ZFS_PROP_COMPRESSION),
1852 		    ZIO_COMPRESS_OFF) == 0);
1853 		VERIFY(nvlist_add_uint64(nv,
1854 		    zfs_prop_to_name(ZFS_PROP_CHECKSUM),
1855 		    ZIO_CHECKSUM_OFF) == 0);
1856 		if (version >= SPA_VERSION_DEDUP) {
1857 			VERIFY(nvlist_add_uint64(nv,
1858 			    zfs_prop_to_name(ZFS_PROP_DEDUP),
1859 			    ZIO_CHECKSUM_OFF) == 0);
1860 		}
1861 
1862 		error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
1863 		    nv, NULL);
1864 		nvlist_free(nv);
1865 
1866 		if (error)
1867 			return (error);
1868 	}
1869 
1870 	/* Allocate the space for the dump */
1871 	error = zvol_prealloc(zv);
1872 	return (error);
1873 }
1874 
1875 static int
1876 zvol_dumpify(zvol_state_t *zv)
1877 {
1878 	int error = 0;
1879 	uint64_t dumpsize = 0;
1880 	dmu_tx_t *tx;
1881 	objset_t *os = zv->zv_objset;
1882 
1883 	if (zv->zv_flags & ZVOL_RDONLY)
1884 		return (EROFS);
1885 
1886 	if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
1887 	    8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
1888 		boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE;
1889 
1890 		if ((error = zvol_dump_init(zv, resize)) != 0) {
1891 			(void) zvol_dump_fini(zv);
1892 			return (error);
1893 		}
1894 	}
1895 
1896 	/*
1897 	 * Build up our lba mapping.
1898 	 */
1899 	error = zvol_get_lbas(zv);
1900 	if (error) {
1901 		(void) zvol_dump_fini(zv);
1902 		return (error);
1903 	}
1904 
1905 	tx = dmu_tx_create(os);
1906 	dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1907 	error = dmu_tx_assign(tx, TXG_WAIT);
1908 	if (error) {
1909 		dmu_tx_abort(tx);
1910 		(void) zvol_dump_fini(zv);
1911 		return (error);
1912 	}
1913 
1914 	zv->zv_flags |= ZVOL_DUMPIFIED;
1915 	error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
1916 	    &zv->zv_volsize, tx);
1917 	dmu_tx_commit(tx);
1918 
1919 	if (error) {
1920 		(void) zvol_dump_fini(zv);
1921 		return (error);
1922 	}
1923 
1924 	txg_wait_synced(dmu_objset_pool(os), 0);
1925 	return (0);
1926 }
1927 
1928 static int
1929 zvol_dump_fini(zvol_state_t *zv)
1930 {
1931 	dmu_tx_t *tx;
1932 	objset_t *os = zv->zv_objset;
1933 	nvlist_t *nv;
1934 	int error = 0;
1935 	uint64_t checksum, compress, refresrv, vbs, dedup;
1936 	uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
1937 
1938 	/*
1939 	 * Attempt to restore the zvol back to its pre-dumpified state.
1940 	 * This is a best-effort attempt as it's possible that not all
1941 	 * of these properties were initialized during the dumpify process
1942 	 * (i.e. error during zvol_dump_init).
1943 	 */
1944 
1945 	tx = dmu_tx_create(os);
1946 	dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1947 	error = dmu_tx_assign(tx, TXG_WAIT);
1948 	if (error) {
1949 		dmu_tx_abort(tx);
1950 		return (error);
1951 	}
1952 	(void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
1953 	dmu_tx_commit(tx);
1954 
1955 	(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1956 	    zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
1957 	(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1958 	    zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
1959 	(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1960 	    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
1961 	(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1962 	    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
1963 
1964 	VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1965 	(void) nvlist_add_uint64(nv,
1966 	    zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
1967 	(void) nvlist_add_uint64(nv,
1968 	    zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
1969 	(void) nvlist_add_uint64(nv,
1970 	    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
1971 	if (version >= SPA_VERSION_DEDUP &&
1972 	    zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1973 	    zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) {
1974 		(void) nvlist_add_uint64(nv,
1975 		    zfs_prop_to_name(ZFS_PROP_DEDUP), dedup);
1976 	}
1977 	(void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
1978 	    nv, NULL);
1979 	nvlist_free(nv);
1980 
1981 	zvol_free_extents(zv);
1982 	zv->zv_flags &= ~ZVOL_DUMPIFIED;
1983 	(void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);
1984 	/* wait for dmu_free_long_range to actually free the blocks */
1985 	txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
1986 	tx = dmu_tx_create(os);
1987 	dmu_tx_hold_bonus(tx, ZVOL_OBJ);
1988 	error = dmu_tx_assign(tx, TXG_WAIT);
1989 	if (error) {
1990 		dmu_tx_abort(tx);
1991 		return (error);
1992 	}
1993 	if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0)
1994 		zv->zv_volblocksize = vbs;
1995 	dmu_tx_commit(tx);
1996 
1997 	return (0);
1998 }
1999