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 * Copyright (c) 2006-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
25 * All rights reserved.
26 *
27 * Portions Copyright 2010 Robert Milkowski
28 *
29 * Copyright 2017 Nexenta Systems, Inc. All rights reserved.
30 * Copyright (c) 2012, 2017 by Delphix. All rights reserved.
31 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
32 * Copyright (c) 2014 Integros [integros.com]
33 * Copyright (c) 2016 Actifio, Inc. All rights reserved.
34 */
35
36 /* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */
37
38 /*
39 * ZFS volume emulation driver.
40 *
41 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
42 * Volumes are accessed through the symbolic links named:
43 *
44 * /dev/zvol/dsk/<pool_name>/<dataset_name>
45 * /dev/zvol/rdsk/<pool_name>/<dataset_name>
46 *
47 * These links are created by the /dev filesystem (sdev_zvolops.c).
48 * Volumes are persistent through reboot. No user command needs to be
49 * run before opening and using a device.
50 *
51 * FreeBSD notes.
52 * On FreeBSD ZVOLs are simply GEOM providers like any other storage device
53 * in the system.
54 */
55
56 #include <sys/types.h>
57 #include <sys/param.h>
58 #include <sys/kernel.h>
59 #include <sys/errno.h>
60 #include <sys/uio.h>
61 #include <sys/bio.h>
62 #include <sys/buf.h>
63 #include <sys/kmem.h>
64 #include <sys/conf.h>
65 #include <sys/cmn_err.h>
66 #include <sys/stat.h>
67 #include <sys/zap.h>
68 #include <sys/spa.h>
69 #include <sys/spa_impl.h>
70 #include <sys/zio.h>
71 #include <sys/disk.h>
72 #include <sys/dmu_traverse.h>
73 #include <sys/dnode.h>
74 #include <sys/dsl_dataset.h>
75 #include <sys/dsl_prop.h>
76 #include <sys/dkio.h>
77 #include <sys/byteorder.h>
78 #include <sys/sunddi.h>
79 #include <sys/dirent.h>
80 #include <sys/policy.h>
81 #include <sys/queue.h>
82 #include <sys/fs/zfs.h>
83 #include <sys/zfs_ioctl.h>
84 #include <sys/zil.h>
85 #include <sys/refcount.h>
86 #include <sys/zfs_znode.h>
87 #include <sys/zfs_rlock.h>
88 #include <sys/vdev_impl.h>
89 #include <sys/vdev_raidz.h>
90 #include <sys/zvol.h>
91 #include <sys/zil_impl.h>
92 #include <sys/dbuf.h>
93 #include <sys/dmu_tx.h>
94 #include <sys/zfeature.h>
95 #include <sys/zio_checksum.h>
96 #include <sys/zil_impl.h>
97 #include <sys/filio.h>
98 #include <sys/zfs_rlock.h>
99 #include <sys/dataset_kstats.h>
100
101 #include <geom/geom.h>
102
103 #include "zfs_namecheck.h"
104
105 #ifndef illumos
106 struct g_class zfs_zvol_class = {
107 .name = "ZFS::ZVOL",
108 .version = G_VERSION,
109 };
110
111 DECLARE_GEOM_CLASS(zfs_zvol_class, zfs_zvol);
112
113 #endif
114 void *zfsdev_state;
115 static char *zvol_tag = "zvol_tag";
116
117 #define ZVOL_DUMPSIZE "dumpsize"
118
119 /*
120 * This lock protects the zfsdev_state structure from being modified
121 * while it's being used, e.g. an open that comes in before a create
122 * finishes. It also protects temporary opens of the dataset so that,
123 * e.g., an open doesn't get a spurious EBUSY.
124 */
125 #ifdef illumos
126 kmutex_t zfsdev_state_lock;
127 #else
128 /*
129 * In FreeBSD we've replaced the upstream zfsdev_state_lock with the
130 * spa_namespace_lock in the ZVOL code.
131 */
132 #define zfsdev_state_lock spa_namespace_lock
133 #endif
134 static uint32_t zvol_minors;
135
136 #ifndef illumos
137 SYSCTL_DECL(_vfs_zfs);
138 SYSCTL_NODE(_vfs_zfs, OID_AUTO, vol, CTLFLAG_RW, 0, "ZFS VOLUME");
139 static int volmode = ZFS_VOLMODE_GEOM;
140 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, mode, CTLFLAG_RWTUN, &volmode, 0,
141 "Expose as GEOM providers (1), device files (2) or neither");
142 static boolean_t zpool_on_zvol = B_FALSE;
143 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, recursive, CTLFLAG_RWTUN, &zpool_on_zvol, 0,
144 "Allow zpools to use zvols as vdevs (DANGEROUS)");
145
146 #endif
147 typedef struct zvol_extent {
148 list_node_t ze_node;
149 dva_t ze_dva; /* dva associated with this extent */
150 uint64_t ze_nblks; /* number of blocks in extent */
151 } zvol_extent_t;
152
153 /*
154 * The in-core state of each volume.
155 */
156 typedef struct zvol_state {
157 #ifndef illumos
158 LIST_ENTRY(zvol_state) zv_links;
159 #endif
160 char zv_name[MAXPATHLEN]; /* pool/dd name */
161 uint64_t zv_volsize; /* amount of space we advertise */
162 uint64_t zv_volblocksize; /* volume block size */
163 #ifdef illumos
164 minor_t zv_minor; /* minor number */
165 #else
166 struct cdev *zv_dev; /* non-GEOM device */
167 struct g_provider *zv_provider; /* GEOM provider */
168 #endif
169 uint8_t zv_min_bs; /* minimum addressable block shift */
170 uint8_t zv_flags; /* readonly, dumpified, etc. */
171 objset_t *zv_objset; /* objset handle */
172 #ifdef illumos
173 uint32_t zv_open_count[OTYPCNT]; /* open counts */
174 #endif
175 uint32_t zv_total_opens; /* total open count */
176 uint32_t zv_sync_cnt; /* synchronous open count */
177 zilog_t *zv_zilog; /* ZIL handle */
178 list_t zv_extents; /* List of extents for dump */
179 rangelock_t zv_rangelock;
180 dnode_t *zv_dn; /* dnode hold */
181 dataset_kstats_t zv_kstat; /* zvol kstats */
182 #ifndef illumos
183 int zv_state;
184 int zv_volmode; /* Provide GEOM or cdev */
185 struct bio_queue_head zv_queue;
186 struct mtx zv_queue_mtx; /* zv_queue mutex */
187 #endif
188 } zvol_state_t;
189
190 typedef enum {
191 ZVOL_ASYNC_CREATE_MINORS,
192 ZVOL_ASYNC_REMOVE_MINORS,
193 ZVOL_ASYNC_RENAME_MINORS,
194 ZVOL_ASYNC_MAX
195 } zvol_async_op_t;
196
197 typedef struct {
198 zvol_async_op_t op;
199 char pool[ZFS_MAX_DATASET_NAME_LEN];
200 char name1[ZFS_MAX_DATASET_NAME_LEN];
201 char name2[ZFS_MAX_DATASET_NAME_LEN];
202 } zvol_task_t;
203
204 #ifndef illumos
205 static LIST_HEAD(, zvol_state) all_zvols;
206 #endif
207 /*
208 * zvol specific flags
209 */
210 #define ZVOL_RDONLY 0x1
211 #define ZVOL_DUMPIFIED 0x2
212 #define ZVOL_EXCL 0x4
213 #define ZVOL_WCE 0x8
214
215 /*
216 * zvol maximum transfer in one DMU tx.
217 */
218 int zvol_maxphys = DMU_MAX_ACCESS/2;
219
220 /*
221 * Toggle unmap functionality.
222 */
223 boolean_t zvol_unmap_enabled = B_TRUE;
224
225 /*
226 * If true, unmaps requested as synchronous are executed synchronously,
227 * otherwise all unmaps are asynchronous.
228 */
229 boolean_t zvol_unmap_sync_enabled = B_FALSE;
230
231 #ifndef illumos
232 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_enabled, CTLFLAG_RWTUN,
233 &zvol_unmap_enabled, 0,
234 "Enable UNMAP functionality");
235
236 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_sync_enabled, CTLFLAG_RWTUN,
237 &zvol_unmap_sync_enabled, 0,
238 "UNMAPs requested as sync are executed synchronously");
239
240 static d_open_t zvol_d_open;
241 static d_close_t zvol_d_close;
242 static d_read_t zvol_read;
243 static d_write_t zvol_write;
244 static d_ioctl_t zvol_d_ioctl;
245 static d_strategy_t zvol_strategy;
246
247 static struct cdevsw zvol_cdevsw = {
248 .d_version = D_VERSION,
249 .d_open = zvol_d_open,
250 .d_close = zvol_d_close,
251 .d_read = zvol_read,
252 .d_write = zvol_write,
253 .d_ioctl = zvol_d_ioctl,
254 .d_strategy = zvol_strategy,
255 .d_name = "zvol",
256 .d_flags = D_DISK | D_TRACKCLOSE,
257 };
258
259 static void zvol_geom_run(zvol_state_t *zv);
260 static void zvol_geom_destroy(zvol_state_t *zv);
261 static int zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace);
262 static void zvol_geom_start(struct bio *bp);
263 static void zvol_geom_worker(void *arg);
264 static void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
265 uint64_t len, boolean_t sync);
266 #endif /* !illumos */
267
268 extern int zfs_set_prop_nvlist(const char *, zprop_source_t,
269 nvlist_t *, nvlist_t *);
270 static int zvol_remove_zv(zvol_state_t *);
271 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf,
272 struct lwb *lwb, zio_t *zio);
273 static int zvol_dumpify(zvol_state_t *zv);
274 static int zvol_dump_fini(zvol_state_t *zv);
275 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
276
277 static void
zvol_size_changed(zvol_state_t * zv,uint64_t volsize)278 zvol_size_changed(zvol_state_t *zv, uint64_t volsize)
279 {
280 #ifdef illumos
281 dev_t dev = makedevice(ddi_driver_major(zfs_dip), zv->zv_minor);
282
283 zv->zv_volsize = volsize;
284 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
285 "Size", volsize) == DDI_SUCCESS);
286 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
287 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS);
288
289 /* Notify specfs to invalidate the cached size */
290 spec_size_invalidate(dev, VBLK);
291 spec_size_invalidate(dev, VCHR);
292 #else /* !illumos */
293 zv->zv_volsize = volsize;
294 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
295 struct g_provider *pp;
296
297 pp = zv->zv_provider;
298 if (pp == NULL)
299 return;
300 g_topology_lock();
301
302 /*
303 * Do not invoke resize event when initial size was zero.
304 * ZVOL initializes the size on first open, this is not
305 * real resizing.
306 */
307 if (pp->mediasize == 0)
308 pp->mediasize = zv->zv_volsize;
309 else
310 g_resize_provider(pp, zv->zv_volsize);
311 g_topology_unlock();
312 }
313 #endif /* illumos */
314 }
315
316 int
zvol_check_volsize(uint64_t volsize,uint64_t blocksize)317 zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
318 {
319 if (volsize == 0)
320 return (SET_ERROR(EINVAL));
321
322 if (volsize % blocksize != 0)
323 return (SET_ERROR(EINVAL));
324
325 #ifdef _ILP32
326 if (volsize - 1 > SPEC_MAXOFFSET_T)
327 return (SET_ERROR(EOVERFLOW));
328 #endif
329 return (0);
330 }
331
332 int
zvol_check_volblocksize(uint64_t volblocksize)333 zvol_check_volblocksize(uint64_t volblocksize)
334 {
335 if (volblocksize < SPA_MINBLOCKSIZE ||
336 volblocksize > SPA_OLD_MAXBLOCKSIZE ||
337 !ISP2(volblocksize))
338 return (SET_ERROR(EDOM));
339
340 return (0);
341 }
342
343 int
zvol_get_stats(objset_t * os,nvlist_t * nv)344 zvol_get_stats(objset_t *os, nvlist_t *nv)
345 {
346 int error;
347 dmu_object_info_t doi;
348 uint64_t val;
349
350 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
351 if (error)
352 return (error);
353
354 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
355
356 error = dmu_object_info(os, ZVOL_OBJ, &doi);
357
358 if (error == 0) {
359 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
360 doi.doi_data_block_size);
361 }
362
363 return (error);
364 }
365
366 static zvol_state_t *
zvol_minor_lookup(const char * name)367 zvol_minor_lookup(const char *name)
368 {
369 #ifdef illumos
370 minor_t minor;
371 #endif
372 zvol_state_t *zv;
373
374 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
375
376 #ifdef illumos
377 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
378 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
379 if (zv == NULL)
380 continue;
381 #else
382 LIST_FOREACH(zv, &all_zvols, zv_links) {
383 #endif
384 if (strcmp(zv->zv_name, name) == 0)
385 return (zv);
386 }
387
388 return (NULL);
389 }
390
391 /* extent mapping arg */
392 struct maparg {
393 zvol_state_t *ma_zv;
394 uint64_t ma_blks;
395 };
396
397 /*ARGSUSED*/
398 static int
399 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
400 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
401 {
402 struct maparg *ma = arg;
403 zvol_extent_t *ze;
404 int bs = ma->ma_zv->zv_volblocksize;
405
406 if (bp == NULL || BP_IS_HOLE(bp) ||
407 zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
408 return (0);
409
410 VERIFY(!BP_IS_EMBEDDED(bp));
411
412 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
413 ma->ma_blks++;
414
415 /* Abort immediately if we have encountered gang blocks */
416 if (BP_IS_GANG(bp))
417 return (SET_ERROR(EFRAGS));
418
419 /*
420 * See if the block is at the end of the previous extent.
421 */
422 ze = list_tail(&ma->ma_zv->zv_extents);
423 if (ze &&
424 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
425 DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
426 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
427 ze->ze_nblks++;
428 return (0);
429 }
430
431 dprintf_bp(bp, "%s", "next blkptr:");
432
433 /* start a new extent */
434 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
435 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */
436 ze->ze_nblks = 1;
437 list_insert_tail(&ma->ma_zv->zv_extents, ze);
438 return (0);
439 }
440
441 static void
442 zvol_free_extents(zvol_state_t *zv)
443 {
444 zvol_extent_t *ze;
445
446 while (ze = list_head(&zv->zv_extents)) {
447 list_remove(&zv->zv_extents, ze);
448 kmem_free(ze, sizeof (zvol_extent_t));
449 }
450 }
451
452 static int
453 zvol_get_lbas(zvol_state_t *zv)
454 {
455 objset_t *os = zv->zv_objset;
456 struct maparg ma;
457 int err;
458
459 ma.ma_zv = zv;
460 ma.ma_blks = 0;
461 zvol_free_extents(zv);
462
463 /* commit any in-flight changes before traversing the dataset */
464 txg_wait_synced(dmu_objset_pool(os), 0);
465 err = traverse_dataset(dmu_objset_ds(os), 0,
466 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
467 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
468 zvol_free_extents(zv);
469 return (err ? err : EIO);
470 }
471
472 return (0);
473 }
474
475 /* ARGSUSED */
476 void
477 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
478 {
479 zfs_creat_t *zct = arg;
480 nvlist_t *nvprops = zct->zct_props;
481 int error;
482 uint64_t volblocksize, volsize;
483
484 VERIFY(nvlist_lookup_uint64(nvprops,
485 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
486 if (nvlist_lookup_uint64(nvprops,
487 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
488 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
489
490 /*
491 * These properties must be removed from the list so the generic
492 * property setting step won't apply to them.
493 */
494 VERIFY(nvlist_remove_all(nvprops,
495 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
496 (void) nvlist_remove_all(nvprops,
497 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
498
499 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
500 DMU_OT_NONE, 0, tx);
501 ASSERT(error == 0);
502
503 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
504 DMU_OT_NONE, 0, tx);
505 ASSERT(error == 0);
506
507 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
508 ASSERT(error == 0);
509 }
510
511 /*
512 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we
513 * implement DKIOCFREE/free-long-range.
514 */
515 static int
516 zvol_replay_truncate(void *arg1, void *arg2, boolean_t byteswap)
517 {
518 zvol_state_t *zv = arg1;
519 lr_truncate_t *lr = arg2;
520 uint64_t offset, length;
521
522 if (byteswap)
523 byteswap_uint64_array(lr, sizeof (*lr));
524
525 offset = lr->lr_offset;
526 length = lr->lr_length;
527
528 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length));
529 }
530
531 /*
532 * Replay a TX_WRITE ZIL transaction that didn't get committed
533 * after a system failure
534 */
535 static int
536 zvol_replay_write(void *arg1, void *arg2, boolean_t byteswap)
537 {
538 zvol_state_t *zv = arg1;
539 lr_write_t *lr = arg2;
540 objset_t *os = zv->zv_objset;
541 char *data = (char *)(lr + 1); /* data follows lr_write_t */
542 uint64_t offset, length;
543 dmu_tx_t *tx;
544 int error;
545
546 if (byteswap)
547 byteswap_uint64_array(lr, sizeof (*lr));
548
549 offset = lr->lr_offset;
550 length = lr->lr_length;
551
552 /* If it's a dmu_sync() block, write the whole block */
553 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
554 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
555 if (length < blocksize) {
556 offset -= offset % blocksize;
557 length = blocksize;
558 }
559 }
560
561 tx = dmu_tx_create(os);
562 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length);
563 error = dmu_tx_assign(tx, TXG_WAIT);
564 if (error) {
565 dmu_tx_abort(tx);
566 } else {
567 dmu_write(os, ZVOL_OBJ, offset, length, data, tx);
568 dmu_tx_commit(tx);
569 }
570
571 return (error);
572 }
573
574 /* ARGSUSED */
575 static int
576 zvol_replay_err(void *arg1, void *arg2, boolean_t byteswap)
577 {
578 return (SET_ERROR(ENOTSUP));
579 }
580
581 /*
582 * Callback vectors for replaying records.
583 * Only TX_WRITE and TX_TRUNCATE are needed for zvol.
584 */
585 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
586 zvol_replay_err, /* 0 no such transaction type */
587 zvol_replay_err, /* TX_CREATE */
588 zvol_replay_err, /* TX_MKDIR */
589 zvol_replay_err, /* TX_MKXATTR */
590 zvol_replay_err, /* TX_SYMLINK */
591 zvol_replay_err, /* TX_REMOVE */
592 zvol_replay_err, /* TX_RMDIR */
593 zvol_replay_err, /* TX_LINK */
594 zvol_replay_err, /* TX_RENAME */
595 zvol_replay_write, /* TX_WRITE */
596 zvol_replay_truncate, /* TX_TRUNCATE */
597 zvol_replay_err, /* TX_SETATTR */
598 zvol_replay_err, /* TX_ACL */
599 zvol_replay_err, /* TX_CREATE_ACL */
600 zvol_replay_err, /* TX_CREATE_ATTR */
601 zvol_replay_err, /* TX_CREATE_ACL_ATTR */
602 zvol_replay_err, /* TX_MKDIR_ACL */
603 zvol_replay_err, /* TX_MKDIR_ATTR */
604 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */
605 zvol_replay_err, /* TX_WRITE2 */
606 };
607
608 #ifdef illumos
609 int
610 zvol_name2minor(const char *name, minor_t *minor)
611 {
612 zvol_state_t *zv;
613
614 mutex_enter(&zfsdev_state_lock);
615 zv = zvol_minor_lookup(name);
616 if (minor && zv)
617 *minor = zv->zv_minor;
618 mutex_exit(&zfsdev_state_lock);
619 return (zv ? 0 : -1);
620 }
621 #endif /* illumos */
622
623 /*
624 * Create a minor node (plus a whole lot more) for the specified volume.
625 */
626 static int
627 zvol_create_minor(const char *name)
628 {
629 zfs_soft_state_t *zs;
630 zvol_state_t *zv;
631 objset_t *os;
632 #ifdef illumos
633 dmu_object_info_t doi;
634 minor_t minor = 0;
635 char chrbuf[30], blkbuf[30];
636 #else
637 struct g_provider *pp;
638 struct g_geom *gp;
639 uint64_t mode;
640 #endif
641 int error;
642
643 #ifndef illumos
644 ZFS_LOG(1, "Creating ZVOL %s...", name);
645 #endif
646
647 mutex_enter(&zfsdev_state_lock);
648
649 if (zvol_minor_lookup(name) != NULL) {
650 mutex_exit(&zfsdev_state_lock);
651 return (SET_ERROR(EEXIST));
652 }
653
654 /* lie and say we're read-only */
655 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os);
656
657 if (error) {
658 mutex_exit(&zfsdev_state_lock);
659 return (error);
660 }
661
662 #ifdef illumos
663 if ((minor = zfsdev_minor_alloc()) == 0) {
664 dmu_objset_disown(os, FTAG);
665 mutex_exit(&zfsdev_state_lock);
666 return (SET_ERROR(ENXIO));
667 }
668
669 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) {
670 dmu_objset_disown(os, FTAG);
671 mutex_exit(&zfsdev_state_lock);
672 return (SET_ERROR(EAGAIN));
673 }
674 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
675 (char *)name);
676
677 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor);
678
679 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
680 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
681 ddi_soft_state_free(zfsdev_state, minor);
682 dmu_objset_disown(os, FTAG);
683 mutex_exit(&zfsdev_state_lock);
684 return (SET_ERROR(EAGAIN));
685 }
686
687 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor);
688
689 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
690 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
691 ddi_remove_minor_node(zfs_dip, chrbuf);
692 ddi_soft_state_free(zfsdev_state, minor);
693 dmu_objset_disown(os, FTAG);
694 mutex_exit(&zfsdev_state_lock);
695 return (SET_ERROR(EAGAIN));
696 }
697
698 zs = ddi_get_soft_state(zfsdev_state, minor);
699 zs->zss_type = ZSST_ZVOL;
700 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
701 #else /* !illumos */
702
703 zv = kmem_zalloc(sizeof(*zv), KM_SLEEP);
704 zv->zv_state = 0;
705 error = dsl_prop_get_integer(name,
706 zfs_prop_to_name(ZFS_PROP_VOLMODE), &mode, NULL);
707 if (error != 0 || mode == ZFS_VOLMODE_DEFAULT)
708 mode = volmode;
709
710 zv->zv_volmode = mode;
711 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
712 g_topology_lock();
713 gp = g_new_geomf(&zfs_zvol_class, "zfs::zvol::%s", name);
714 gp->start = zvol_geom_start;
715 gp->access = zvol_geom_access;
716 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, name);
717 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND;
718 pp->sectorsize = DEV_BSIZE;
719 pp->mediasize = 0;
720 pp->private = zv;
721
722 zv->zv_provider = pp;
723 bioq_init(&zv->zv_queue);
724 mtx_init(&zv->zv_queue_mtx, "zvol", NULL, MTX_DEF);
725 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
726 struct make_dev_args args;
727
728 make_dev_args_init(&args);
729 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
730 args.mda_devsw = &zvol_cdevsw;
731 args.mda_cr = NULL;
732 args.mda_uid = UID_ROOT;
733 args.mda_gid = GID_OPERATOR;
734 args.mda_mode = 0640;
735 args.mda_si_drv2 = zv;
736 error = make_dev_s(&args, &zv->zv_dev,
737 "%s/%s", ZVOL_DRIVER, name);
738 if (error != 0) {
739 kmem_free(zv, sizeof(*zv));
740 dmu_objset_disown(os, FTAG);
741 mutex_exit(&zfsdev_state_lock);
742 return (error);
743 }
744 zv->zv_dev->si_iosize_max = MAXPHYS;
745 }
746 LIST_INSERT_HEAD(&all_zvols, zv, zv_links);
747 #endif /* illumos */
748
749 (void) strlcpy(zv->zv_name, name, MAXPATHLEN);
750 zv->zv_min_bs = DEV_BSHIFT;
751 #ifdef illumos
752 zv->zv_minor = minor;
753 #endif
754 zv->zv_objset = os;
755 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os)))
756 zv->zv_flags |= ZVOL_RDONLY;
757 rangelock_init(&zv->zv_rangelock, NULL, NULL);
758 list_create(&zv->zv_extents, sizeof (zvol_extent_t),
759 offsetof(zvol_extent_t, ze_node));
760 #ifdef illumos
761 /* get and cache the blocksize */
762 error = dmu_object_info(os, ZVOL_OBJ, &doi);
763 ASSERT(error == 0);
764 zv->zv_volblocksize = doi.doi_data_block_size;
765 #endif
766
767 if (spa_writeable(dmu_objset_spa(os))) {
768 if (zil_replay_disable)
769 zil_destroy(dmu_objset_zil(os), B_FALSE);
770 else
771 zil_replay(os, zv, zvol_replay_vector);
772 }
773
774 ASSERT3P(zv->zv_kstat.dk_kstats, ==, NULL);
775 dataset_kstats_create(&zv->zv_kstat, zv->zv_objset);
776
777 dmu_objset_disown(os, FTAG);
778 zv->zv_objset = NULL;
779
780 zvol_minors++;
781
782 mutex_exit(&zfsdev_state_lock);
783 #ifndef illumos
784 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
785 zvol_geom_run(zv);
786 g_topology_unlock();
787 }
788
789 ZFS_LOG(1, "ZVOL %s created.", name);
790 #endif
791
792 return (0);
793 }
794
795 /*
796 * Remove minor node for the specified volume.
797 */
798 static int
799 zvol_remove_zv(zvol_state_t *zv)
800 {
801 #ifdef illumos
802 char nmbuf[20];
803 minor_t minor = zv->zv_minor;
804 #endif
805
806 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
807 if (zv->zv_total_opens != 0)
808 return (SET_ERROR(EBUSY));
809
810 #ifdef illumos
811 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor);
812 ddi_remove_minor_node(zfs_dip, nmbuf);
813
814 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor);
815 ddi_remove_minor_node(zfs_dip, nmbuf);
816 #else
817 ZFS_LOG(1, "ZVOL %s destroyed.", zv->zv_name);
818
819 LIST_REMOVE(zv, zv_links);
820 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
821 g_topology_lock();
822 zvol_geom_destroy(zv);
823 g_topology_unlock();
824 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
825 if (zv->zv_dev != NULL)
826 destroy_dev(zv->zv_dev);
827 }
828 #endif
829
830 rangelock_fini(&zv->zv_rangelock);
831
832 dataset_kstats_destroy(&zv->zv_kstat);
833 kmem_free(zv, sizeof (zvol_state_t));
834 #ifdef illumos
835 ddi_soft_state_free(zfsdev_state, minor);
836 #endif
837 zvol_minors--;
838 return (0);
839 }
840
841 int
842 zvol_first_open(zvol_state_t *zv)
843 {
844 dmu_object_info_t doi;
845 objset_t *os;
846 uint64_t volsize;
847 int error;
848 uint64_t readonly;
849
850 /* lie and say we're read-only */
851 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE,
852 zvol_tag, &os);
853 if (error)
854 return (error);
855
856 zv->zv_objset = os;
857 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
858 if (error) {
859 ASSERT(error == 0);
860 dmu_objset_disown(os, zvol_tag);
861 return (error);
862 }
863
864 /* get and cache the blocksize */
865 error = dmu_object_info(os, ZVOL_OBJ, &doi);
866 if (error) {
867 ASSERT(error == 0);
868 dmu_objset_disown(os, zvol_tag);
869 return (error);
870 }
871 zv->zv_volblocksize = doi.doi_data_block_size;
872
873 error = dnode_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dn);
874 if (error) {
875 dmu_objset_disown(os, zvol_tag);
876 return (error);
877 }
878
879 zvol_size_changed(zv, volsize);
880 zv->zv_zilog = zil_open(os, zvol_get_data);
881
882 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly,
883 NULL) == 0);
884 if (readonly || dmu_objset_is_snapshot(os) ||
885 !spa_writeable(dmu_objset_spa(os)))
886 zv->zv_flags |= ZVOL_RDONLY;
887 else
888 zv->zv_flags &= ~ZVOL_RDONLY;
889 return (error);
890 }
891
892 void
893 zvol_last_close(zvol_state_t *zv)
894 {
895 zil_close(zv->zv_zilog);
896 zv->zv_zilog = NULL;
897
898 dnode_rele(zv->zv_dn, zvol_tag);
899 zv->zv_dn = NULL;
900
901 /*
902 * Evict cached data
903 */
904 if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) &&
905 !(zv->zv_flags & ZVOL_RDONLY))
906 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
907 dmu_objset_evict_dbufs(zv->zv_objset);
908
909 dmu_objset_disown(zv->zv_objset, zvol_tag);
910 zv->zv_objset = NULL;
911 }
912
913 #ifdef illumos
914 int
915 zvol_prealloc(zvol_state_t *zv)
916 {
917 objset_t *os = zv->zv_objset;
918 dmu_tx_t *tx;
919 uint64_t refd, avail, usedobjs, availobjs;
920 uint64_t resid = zv->zv_volsize;
921 uint64_t off = 0;
922
923 /* Check the space usage before attempting to allocate the space */
924 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
925 if (avail < zv->zv_volsize)
926 return (SET_ERROR(ENOSPC));
927
928 /* Free old extents if they exist */
929 zvol_free_extents(zv);
930
931 while (resid != 0) {
932 int error;
933 uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE);
934
935 tx = dmu_tx_create(os);
936 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
937 error = dmu_tx_assign(tx, TXG_WAIT);
938 if (error) {
939 dmu_tx_abort(tx);
940 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
941 return (error);
942 }
943 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
944 dmu_tx_commit(tx);
945 off += bytes;
946 resid -= bytes;
947 }
948 txg_wait_synced(dmu_objset_pool(os), 0);
949
950 return (0);
951 }
952 #endif /* illumos */
953
954 static int
955 zvol_update_volsize(objset_t *os, uint64_t volsize)
956 {
957 dmu_tx_t *tx;
958 int error;
959
960 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
961
962 tx = dmu_tx_create(os);
963 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
964 dmu_tx_mark_netfree(tx);
965 error = dmu_tx_assign(tx, TXG_WAIT);
966 if (error) {
967 dmu_tx_abort(tx);
968 return (error);
969 }
970
971 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1,
972 &volsize, tx);
973 dmu_tx_commit(tx);
974
975 if (error == 0)
976 error = dmu_free_long_range(os,
977 ZVOL_OBJ, volsize, DMU_OBJECT_END);
978 return (error);
979 }
980
981 void
982 zvol_remove_minors_impl(const char *name)
983 {
984 #ifdef illumos
985 zvol_state_t *zv;
986 char *namebuf;
987 minor_t minor;
988
989 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP);
990 (void) strncpy(namebuf, name, strlen(name));
991 (void) strcat(namebuf, "/");
992 mutex_enter(&zfsdev_state_lock);
993 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
994
995 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
996 if (zv == NULL)
997 continue;
998 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0)
999 (void) zvol_remove_zv(zv);
1000 }
1001 kmem_free(namebuf, strlen(name) + 2);
1002
1003 mutex_exit(&zfsdev_state_lock);
1004 #else /* !illumos */
1005 zvol_state_t *zv, *tzv;
1006 size_t namelen;
1007
1008 namelen = strlen(name);
1009
1010 mutex_enter(&zfsdev_state_lock);
1011
1012 LIST_FOREACH_SAFE(zv, &all_zvols, zv_links, tzv) {
1013 if (strcmp(zv->zv_name, name) == 0 ||
1014 (strncmp(zv->zv_name, name, namelen) == 0 &&
1015 strlen(zv->zv_name) > namelen && (zv->zv_name[namelen] == '/' ||
1016 zv->zv_name[namelen] == '@'))) {
1017 (void) zvol_remove_zv(zv);
1018 }
1019 }
1020
1021 mutex_exit(&zfsdev_state_lock);
1022 #endif /* illumos */
1023 }
1024
1025 static int
1026 zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize)
1027 {
1028 uint64_t old_volsize = 0ULL;
1029 int error = 0;
1030
1031 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
1032
1033 /*
1034 * Reinitialize the dump area to the new size. If we
1035 * failed to resize the dump area then restore it back to
1036 * its original size. We must set the new volsize prior
1037 * to calling dumpvp_resize() to ensure that the devices'
1038 * size(9P) is not visible by the dump subsystem.
1039 */
1040 old_volsize = zv->zv_volsize;
1041 zvol_size_changed(zv, volsize);
1042
1043 #ifdef ZVOL_DUMP
1044 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1045 if ((error = zvol_dumpify(zv)) != 0 ||
1046 (error = dumpvp_resize()) != 0) {
1047 int dumpify_error;
1048
1049 (void) zvol_update_volsize(zv->zv_objset, old_volsize);
1050 zvol_size_changed(zv, old_volsize);
1051 dumpify_error = zvol_dumpify(zv);
1052 error = dumpify_error ? dumpify_error : error;
1053 }
1054 }
1055 #endif /* ZVOL_DUMP */
1056
1057 #ifdef illumos
1058 /*
1059 * Generate a LUN expansion event.
1060 */
1061 if (error == 0) {
1062 sysevent_id_t eid;
1063 nvlist_t *attr;
1064 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
1065
1066 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV,
1067 zv->zv_minor);
1068
1069 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1070 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
1071
1072 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
1073 ESC_DEV_DLE, attr, &eid, DDI_SLEEP);
1074
1075 nvlist_free(attr);
1076 kmem_free(physpath, MAXPATHLEN);
1077 }
1078 #endif /* illumos */
1079 return (error);
1080 }
1081
1082 int
1083 zvol_set_volsize(const char *name, uint64_t volsize)
1084 {
1085 zvol_state_t *zv = NULL;
1086 objset_t *os;
1087 int error;
1088 dmu_object_info_t doi;
1089 uint64_t readonly;
1090 boolean_t owned = B_FALSE;
1091
1092 error = dsl_prop_get_integer(name,
1093 zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL);
1094 if (error != 0)
1095 return (error);
1096 if (readonly)
1097 return (SET_ERROR(EROFS));
1098
1099 mutex_enter(&zfsdev_state_lock);
1100 zv = zvol_minor_lookup(name);
1101
1102 if (zv == NULL || zv->zv_objset == NULL) {
1103 if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE,
1104 FTAG, &os)) != 0) {
1105 mutex_exit(&zfsdev_state_lock);
1106 return (error);
1107 }
1108 owned = B_TRUE;
1109 if (zv != NULL)
1110 zv->zv_objset = os;
1111 } else {
1112 os = zv->zv_objset;
1113 }
1114
1115 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 ||
1116 (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0)
1117 goto out;
1118
1119 error = zvol_update_volsize(os, volsize);
1120
1121 if (error == 0 && zv != NULL)
1122 error = zvol_update_live_volsize(zv, volsize);
1123 out:
1124 if (owned) {
1125 dmu_objset_disown(os, FTAG);
1126 if (zv != NULL)
1127 zv->zv_objset = NULL;
1128 }
1129 mutex_exit(&zfsdev_state_lock);
1130 return (error);
1131 }
1132
1133 /*ARGSUSED*/
1134 #ifdef illumos
1135 int
1136 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr)
1137 #else
1138 static int
1139 zvol_open(struct g_provider *pp, int flag, int count)
1140 #endif
1141 {
1142 zvol_state_t *zv;
1143 int err = 0;
1144 #ifdef illumos
1145
1146 mutex_enter(&zfsdev_state_lock);
1147
1148 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL);
1149 if (zv == NULL) {
1150 mutex_exit(&zfsdev_state_lock);
1151 return (SET_ERROR(ENXIO));
1152 }
1153
1154 if (zv->zv_total_opens == 0)
1155 err = zvol_first_open(zv);
1156 if (err) {
1157 mutex_exit(&zfsdev_state_lock);
1158 return (err);
1159 }
1160 #else /* !illumos */
1161 boolean_t locked = B_FALSE;
1162
1163 if (!zpool_on_zvol && tsd_get(zfs_geom_probe_vdev_key) != NULL) {
1164 /*
1165 * if zfs_geom_probe_vdev_key is set, that means that zfs is
1166 * attempting to probe geom providers while looking for a
1167 * replacement for a missing VDEV. In this case, the
1168 * spa_namespace_lock will not be held, but it is still illegal
1169 * to use a zvol as a vdev. Deadlocks can result if another
1170 * thread has spa_namespace_lock
1171 */
1172 return (EOPNOTSUPP);
1173 }
1174 /*
1175 * Protect against recursively entering spa_namespace_lock
1176 * when spa_open() is used for a pool on a (local) ZVOL(s).
1177 * This is needed since we replaced upstream zfsdev_state_lock
1178 * with spa_namespace_lock in the ZVOL code.
1179 * We are using the same trick as spa_open().
1180 * Note that calls in zvol_first_open which need to resolve
1181 * pool name to a spa object will enter spa_open()
1182 * recursively, but that function already has all the
1183 * necessary protection.
1184 */
1185 if (!MUTEX_HELD(&zfsdev_state_lock)) {
1186 mutex_enter(&zfsdev_state_lock);
1187 locked = B_TRUE;
1188 }
1189
1190 zv = pp->private;
1191 if (zv == NULL) {
1192 if (locked)
1193 mutex_exit(&zfsdev_state_lock);
1194 return (SET_ERROR(ENXIO));
1195 }
1196
1197 if (zv->zv_total_opens == 0) {
1198 err = zvol_first_open(zv);
1199 if (err) {
1200 if (locked)
1201 mutex_exit(&zfsdev_state_lock);
1202 return (err);
1203 }
1204 pp->mediasize = zv->zv_volsize;
1205 pp->stripeoffset = 0;
1206 pp->stripesize = zv->zv_volblocksize;
1207 }
1208 #endif /* illumos */
1209 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
1210 err = SET_ERROR(EROFS);
1211 goto out;
1212 }
1213 if (zv->zv_flags & ZVOL_EXCL) {
1214 err = SET_ERROR(EBUSY);
1215 goto out;
1216 }
1217 #ifdef FEXCL
1218 if (flag & FEXCL) {
1219 if (zv->zv_total_opens != 0) {
1220 err = SET_ERROR(EBUSY);
1221 goto out;
1222 }
1223 zv->zv_flags |= ZVOL_EXCL;
1224 }
1225 #endif
1226
1227 #ifdef illumos
1228 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) {
1229 zv->zv_open_count[otyp]++;
1230 zv->zv_total_opens++;
1231 }
1232 mutex_exit(&zfsdev_state_lock);
1233 #else
1234 zv->zv_total_opens += count;
1235 if (locked)
1236 mutex_exit(&zfsdev_state_lock);
1237 #endif
1238
1239 return (err);
1240 out:
1241 if (zv->zv_total_opens == 0)
1242 zvol_last_close(zv);
1243 #ifdef illumos
1244 mutex_exit(&zfsdev_state_lock);
1245 #else
1246 if (locked)
1247 mutex_exit(&zfsdev_state_lock);
1248 #endif
1249 return (err);
1250 }
1251
1252 /*ARGSUSED*/
1253 #ifdef illumos
1254 int
1255 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr)
1256 {
1257 minor_t minor = getminor(dev);
1258 zvol_state_t *zv;
1259 int error = 0;
1260
1261 mutex_enter(&zfsdev_state_lock);
1262
1263 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1264 if (zv == NULL) {
1265 mutex_exit(&zfsdev_state_lock);
1266 #else /* !illumos */
1267 static int
1268 zvol_close(struct g_provider *pp, int flag, int count)
1269 {
1270 zvol_state_t *zv;
1271 int error = 0;
1272 boolean_t locked = B_FALSE;
1273
1274 /* See comment in zvol_open(). */
1275 if (!MUTEX_HELD(&zfsdev_state_lock)) {
1276 mutex_enter(&zfsdev_state_lock);
1277 locked = B_TRUE;
1278 }
1279
1280 zv = pp->private;
1281 if (zv == NULL) {
1282 if (locked)
1283 mutex_exit(&zfsdev_state_lock);
1284 #endif /* illumos */
1285 return (SET_ERROR(ENXIO));
1286 }
1287
1288 if (zv->zv_flags & ZVOL_EXCL) {
1289 ASSERT(zv->zv_total_opens == 1);
1290 zv->zv_flags &= ~ZVOL_EXCL;
1291 }
1292
1293 /*
1294 * If the open count is zero, this is a spurious close.
1295 * That indicates a bug in the kernel / DDI framework.
1296 */
1297 #ifdef illumos
1298 ASSERT(zv->zv_open_count[otyp] != 0);
1299 #endif
1300 ASSERT(zv->zv_total_opens != 0);
1301
1302 /*
1303 * You may get multiple opens, but only one close.
1304 */
1305 #ifdef illumos
1306 zv->zv_open_count[otyp]--;
1307 zv->zv_total_opens--;
1308 #else
1309 zv->zv_total_opens -= count;
1310 #endif
1311
1312 if (zv->zv_total_opens == 0)
1313 zvol_last_close(zv);
1314
1315 #ifdef illumos
1316 mutex_exit(&zfsdev_state_lock);
1317 #else
1318 if (locked)
1319 mutex_exit(&zfsdev_state_lock);
1320 #endif
1321 return (error);
1322 }
1323
1324 /* ARGSUSED */
1325 static void
1326 zvol_get_done(zgd_t *zgd, int error)
1327 {
1328 if (zgd->zgd_db)
1329 dmu_buf_rele(zgd->zgd_db, zgd);
1330
1331 rangelock_exit(zgd->zgd_lr);
1332
1333 kmem_free(zgd, sizeof (zgd_t));
1334 }
1335
1336 /*
1337 * Get data to generate a TX_WRITE intent log record.
1338 */
1339 static int
1340 zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio)
1341 {
1342 zvol_state_t *zv = arg;
1343 uint64_t offset = lr->lr_offset;
1344 uint64_t size = lr->lr_length; /* length of user data */
1345 dmu_buf_t *db;
1346 zgd_t *zgd;
1347 int error;
1348
1349 ASSERT3P(lwb, !=, NULL);
1350 ASSERT3P(zio, !=, NULL);
1351 ASSERT3U(size, !=, 0);
1352
1353 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1354 zgd->zgd_lwb = lwb;
1355
1356 /*
1357 * Write records come in two flavors: immediate and indirect.
1358 * For small writes it's cheaper to store the data with the
1359 * log record (immediate); for large writes it's cheaper to
1360 * sync the data and get a pointer to it (indirect) so that
1361 * we don't have to write the data twice.
1362 */
1363 if (buf != NULL) { /* immediate write */
1364 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size,
1365 RL_READER);
1366 error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf,
1367 DMU_READ_NO_PREFETCH);
1368 } else { /* indirect write */
1369 /*
1370 * Have to lock the whole block to ensure when it's written out
1371 * and its checksum is being calculated that no one can change
1372 * the data. Contrarily to zfs_get_data we need not re-check
1373 * blocksize after we get the lock because it cannot be changed.
1374 */
1375 size = zv->zv_volblocksize;
1376 offset = P2ALIGN(offset, size);
1377 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size,
1378 RL_READER);
1379 error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db,
1380 DMU_READ_NO_PREFETCH);
1381 if (error == 0) {
1382 blkptr_t *bp = &lr->lr_blkptr;
1383
1384 zgd->zgd_db = db;
1385 zgd->zgd_bp = bp;
1386
1387 ASSERT(db->db_offset == offset);
1388 ASSERT(db->db_size == size);
1389
1390 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1391 zvol_get_done, zgd);
1392
1393 if (error == 0)
1394 return (0);
1395 }
1396 }
1397
1398 zvol_get_done(zgd, error);
1399
1400 return (error);
1401 }
1402
1403 /*
1404 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
1405 *
1406 * We store data in the log buffers if it's small enough.
1407 * Otherwise we will later flush the data out via dmu_sync().
1408 */
1409 ssize_t zvol_immediate_write_sz = 32768;
1410 #ifdef _KERNEL
1411 SYSCTL_LONG(_vfs_zfs_vol, OID_AUTO, immediate_write_sz, CTLFLAG_RWTUN,
1412 &zvol_immediate_write_sz, 0, "Minimal size for indirect log write");
1413 #endif
1414
1415 static void
1416 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid,
1417 boolean_t sync)
1418 {
1419 uint32_t blocksize = zv->zv_volblocksize;
1420 zilog_t *zilog = zv->zv_zilog;
1421 itx_wr_state_t write_state;
1422
1423 if (zil_replaying(zilog, tx))
1424 return;
1425
1426 if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
1427 write_state = WR_INDIRECT;
1428 else if (!spa_has_slogs(zilog->zl_spa) &&
1429 resid >= blocksize && blocksize > zvol_immediate_write_sz)
1430 write_state = WR_INDIRECT;
1431 else if (sync)
1432 write_state = WR_COPIED;
1433 else
1434 write_state = WR_NEED_COPY;
1435
1436 while (resid) {
1437 itx_t *itx;
1438 lr_write_t *lr;
1439 itx_wr_state_t wr_state = write_state;
1440 ssize_t len = resid;
1441
1442 if (wr_state == WR_COPIED && resid > zil_max_copied_data(zilog))
1443 wr_state = WR_NEED_COPY;
1444 else if (wr_state == WR_INDIRECT)
1445 len = MIN(blocksize - P2PHASE(off, blocksize), resid);
1446
1447 itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
1448 (wr_state == WR_COPIED ? len : 0));
1449 lr = (lr_write_t *)&itx->itx_lr;
1450 if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn,
1451 off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) {
1452 zil_itx_destroy(itx);
1453 itx = zil_itx_create(TX_WRITE, sizeof (*lr));
1454 lr = (lr_write_t *)&itx->itx_lr;
1455 wr_state = WR_NEED_COPY;
1456 }
1457
1458 itx->itx_wr_state = wr_state;
1459 lr->lr_foid = ZVOL_OBJ;
1460 lr->lr_offset = off;
1461 lr->lr_length = len;
1462 lr->lr_blkoff = 0;
1463 BP_ZERO(&lr->lr_blkptr);
1464
1465 itx->itx_private = zv;
1466
1467 if (!sync && (zv->zv_sync_cnt == 0))
1468 itx->itx_sync = B_FALSE;
1469
1470 zil_itx_assign(zilog, itx, tx);
1471
1472 off += len;
1473 resid -= len;
1474 }
1475 }
1476
1477 #ifdef illumos
1478 static int
1479 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset,
1480 uint64_t size, boolean_t doread, boolean_t isdump)
1481 {
1482 vdev_disk_t *dvd;
1483 int c;
1484 int numerrors = 0;
1485
1486 if (vd->vdev_ops == &vdev_mirror_ops ||
1487 vd->vdev_ops == &vdev_replacing_ops ||
1488 vd->vdev_ops == &vdev_spare_ops) {
1489 for (c = 0; c < vd->vdev_children; c++) {
1490 int err = zvol_dumpio_vdev(vd->vdev_child[c],
1491 addr, offset, origoffset, size, doread, isdump);
1492 if (err != 0) {
1493 numerrors++;
1494 } else if (doread) {
1495 break;
1496 }
1497 }
1498 }
1499
1500 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops)
1501 return (numerrors < vd->vdev_children ? 0 : EIO);
1502
1503 if (doread && !vdev_readable(vd))
1504 return (SET_ERROR(EIO));
1505 else if (!doread && !vdev_writeable(vd))
1506 return (SET_ERROR(EIO));
1507
1508 if (vd->vdev_ops == &vdev_raidz_ops) {
1509 return (vdev_raidz_physio(vd,
1510 addr, size, offset, origoffset, doread, isdump));
1511 }
1512
1513 offset += VDEV_LABEL_START_SIZE;
1514
1515 if (ddi_in_panic() || isdump) {
1516 ASSERT(!doread);
1517 if (doread)
1518 return (SET_ERROR(EIO));
1519 dvd = vd->vdev_tsd;
1520 ASSERT3P(dvd, !=, NULL);
1521 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
1522 lbtodb(size)));
1523 } else {
1524 dvd = vd->vdev_tsd;
1525 ASSERT3P(dvd, !=, NULL);
1526 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size,
1527 offset, doread ? B_READ : B_WRITE));
1528 }
1529 }
1530
1531 static int
1532 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
1533 boolean_t doread, boolean_t isdump)
1534 {
1535 vdev_t *vd;
1536 int error;
1537 zvol_extent_t *ze;
1538 spa_t *spa = dmu_objset_spa(zv->zv_objset);
1539
1540 /* Must be sector aligned, and not stradle a block boundary. */
1541 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
1542 P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
1543 return (SET_ERROR(EINVAL));
1544 }
1545 ASSERT(size <= zv->zv_volblocksize);
1546
1547 /* Locate the extent this belongs to */
1548 ze = list_head(&zv->zv_extents);
1549 while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
1550 offset -= ze->ze_nblks * zv->zv_volblocksize;
1551 ze = list_next(&zv->zv_extents, ze);
1552 }
1553
1554 if (ze == NULL)
1555 return (SET_ERROR(EINVAL));
1556
1557 if (!ddi_in_panic())
1558 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
1559
1560 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
1561 offset += DVA_GET_OFFSET(&ze->ze_dva);
1562 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva),
1563 size, doread, isdump);
1564
1565 if (!ddi_in_panic())
1566 spa_config_exit(spa, SCL_STATE, FTAG);
1567
1568 return (error);
1569 }
1570
1571 int
1572 zvol_strategy(buf_t *bp)
1573 {
1574 zfs_soft_state_t *zs = NULL;
1575 #else /* !illumos */
1576 void
1577 zvol_strategy(struct bio *bp)
1578 {
1579 #endif /* illumos */
1580 zvol_state_t *zv;
1581 uint64_t off, volsize;
1582 size_t resid;
1583 char *addr;
1584 objset_t *os;
1585 int error = 0;
1586 #ifdef illumos
1587 boolean_t doread = bp->b_flags & B_READ;
1588 #else
1589 boolean_t doread = 0;
1590 #endif
1591 boolean_t is_dumpified;
1592 boolean_t sync;
1593
1594 #ifdef illumos
1595 if (getminor(bp->b_edev) == 0) {
1596 error = SET_ERROR(EINVAL);
1597 } else {
1598 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev));
1599 if (zs == NULL)
1600 error = SET_ERROR(ENXIO);
1601 else if (zs->zss_type != ZSST_ZVOL)
1602 error = SET_ERROR(EINVAL);
1603 }
1604
1605 if (error) {
1606 bioerror(bp, error);
1607 biodone(bp);
1608 return (0);
1609 }
1610
1611 zv = zs->zss_data;
1612
1613 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) {
1614 bioerror(bp, EROFS);
1615 biodone(bp);
1616 return (0);
1617 }
1618
1619 off = ldbtob(bp->b_blkno);
1620 #else /* !illumos */
1621 if (bp->bio_to)
1622 zv = bp->bio_to->private;
1623 else
1624 zv = bp->bio_dev->si_drv2;
1625
1626 if (zv == NULL) {
1627 error = SET_ERROR(ENXIO);
1628 goto out;
1629 }
1630
1631 if (bp->bio_cmd != BIO_READ && (zv->zv_flags & ZVOL_RDONLY)) {
1632 error = SET_ERROR(EROFS);
1633 goto out;
1634 }
1635
1636 switch (bp->bio_cmd) {
1637 case BIO_FLUSH:
1638 goto sync;
1639 case BIO_READ:
1640 doread = 1;
1641 case BIO_WRITE:
1642 case BIO_DELETE:
1643 break;
1644 default:
1645 error = EOPNOTSUPP;
1646 goto out;
1647 }
1648
1649 off = bp->bio_offset;
1650 #endif /* illumos */
1651 volsize = zv->zv_volsize;
1652
1653 os = zv->zv_objset;
1654 ASSERT(os != NULL);
1655
1656 #ifdef illumos
1657 bp_mapin(bp);
1658 addr = bp->b_un.b_addr;
1659 resid = bp->b_bcount;
1660
1661 if (resid > 0 && (off < 0 || off >= volsize)) {
1662 bioerror(bp, EIO);
1663 biodone(bp);
1664 return (0);
1665 }
1666
1667 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED;
1668 sync = ((!(bp->b_flags & B_ASYNC) &&
1669 !(zv->zv_flags & ZVOL_WCE)) ||
1670 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) &&
1671 !doread && !is_dumpified;
1672 #else /* !illumos */
1673 addr = bp->bio_data;
1674 resid = bp->bio_length;
1675
1676 if (resid > 0 && (off < 0 || off >= volsize)) {
1677 error = SET_ERROR(EIO);
1678 goto out;
1679 }
1680
1681 is_dumpified = B_FALSE;
1682 sync = !doread && !is_dumpified &&
1683 zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS;
1684 #endif /* illumos */
1685
1686 /*
1687 * There must be no buffer changes when doing a dmu_sync() because
1688 * we can't change the data whilst calculating the checksum.
1689 */
1690 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, off, resid,
1691 doread ? RL_READER : RL_WRITER);
1692
1693 #ifndef illumos
1694 if (bp->bio_cmd == BIO_DELETE) {
1695 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1696 error = dmu_tx_assign(tx, TXG_WAIT);
1697 if (error != 0) {
1698 dmu_tx_abort(tx);
1699 } else {
1700 zvol_log_truncate(zv, tx, off, resid, sync);
1701 dmu_tx_commit(tx);
1702 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
1703 off, resid);
1704 resid = 0;
1705 }
1706 goto unlock;
1707 }
1708 #endif
1709 while (resid != 0 && off < volsize) {
1710 size_t size = MIN(resid, zvol_maxphys);
1711 #ifdef illumos
1712 if (is_dumpified) {
1713 size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
1714 error = zvol_dumpio(zv, addr, off, size,
1715 doread, B_FALSE);
1716 } else if (doread) {
1717 #else
1718 if (doread) {
1719 #endif
1720 error = dmu_read(os, ZVOL_OBJ, off, size, addr,
1721 DMU_READ_PREFETCH);
1722 } else {
1723 dmu_tx_t *tx = dmu_tx_create(os);
1724 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size);
1725 error = dmu_tx_assign(tx, TXG_WAIT);
1726 if (error) {
1727 dmu_tx_abort(tx);
1728 } else {
1729 dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
1730 zvol_log_write(zv, tx, off, size, sync);
1731 dmu_tx_commit(tx);
1732 }
1733 }
1734 if (error) {
1735 /* convert checksum errors into IO errors */
1736 if (error == ECKSUM)
1737 error = SET_ERROR(EIO);
1738 break;
1739 }
1740 off += size;
1741 addr += size;
1742 resid -= size;
1743 }
1744 #ifndef illumos
1745 unlock:
1746 #endif
1747 rangelock_exit(lr);
1748
1749 #ifdef illumos
1750 if ((bp->b_resid = resid) == bp->b_bcount)
1751 bioerror(bp, off > volsize ? EINVAL : error);
1752
1753 if (sync)
1754 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1755 biodone(bp);
1756
1757 return (0);
1758 #else /* !illumos */
1759 bp->bio_completed = bp->bio_length - resid;
1760 if (bp->bio_completed < bp->bio_length && off > volsize)
1761 error = EINVAL;
1762
1763 switch (bp->bio_cmd) {
1764 case BIO_FLUSH:
1765 break;
1766 case BIO_READ:
1767 dataset_kstats_update_read_kstats(&zv->zv_kstat,
1768 bp->bio_completed);
1769 break;
1770 case BIO_WRITE:
1771 dataset_kstats_update_write_kstats(&zv->zv_kstat,
1772 bp->bio_completed);
1773 break;
1774 case BIO_DELETE:
1775 break;
1776 default:
1777 break;
1778 }
1779
1780 if (sync) {
1781 sync:
1782 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1783 }
1784 out:
1785 if (bp->bio_to)
1786 g_io_deliver(bp, error);
1787 else
1788 biofinish(bp, NULL, error);
1789 #endif /* illumos */
1790 }
1791
1792 #ifdef illumos
1793 /*
1794 * Set the buffer count to the zvol maximum transfer.
1795 * Using our own routine instead of the default minphys()
1796 * means that for larger writes we write bigger buffers on X86
1797 * (128K instead of 56K) and flush the disk write cache less often
1798 * (every zvol_maxphys - currently 1MB) instead of minphys (currently
1799 * 56K on X86 and 128K on sparc).
1800 */
1801 void
1802 zvol_minphys(struct buf *bp)
1803 {
1804 if (bp->b_bcount > zvol_maxphys)
1805 bp->b_bcount = zvol_maxphys;
1806 }
1807
1808 int
1809 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
1810 {
1811 minor_t minor = getminor(dev);
1812 zvol_state_t *zv;
1813 int error = 0;
1814 uint64_t size;
1815 uint64_t boff;
1816 uint64_t resid;
1817
1818 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1819 if (zv == NULL)
1820 return (SET_ERROR(ENXIO));
1821
1822 if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0)
1823 return (SET_ERROR(EINVAL));
1824
1825 boff = ldbtob(blkno);
1826 resid = ldbtob(nblocks);
1827
1828 VERIFY3U(boff + resid, <=, zv->zv_volsize);
1829
1830 while (resid) {
1831 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
1832 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
1833 if (error)
1834 break;
1835 boff += size;
1836 addr += size;
1837 resid -= size;
1838 }
1839
1840 return (error);
1841 }
1842
1843 /*ARGSUSED*/
1844 int
1845 zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
1846 {
1847 minor_t minor = getminor(dev);
1848 #else /* !illumos */
1849 int
1850 zvol_read(struct cdev *dev, struct uio *uio, int ioflag)
1851 {
1852 #endif /* illumos */
1853 zvol_state_t *zv;
1854 uint64_t volsize;
1855 int error = 0;
1856
1857 #ifdef illumos
1858 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1859 if (zv == NULL)
1860 return (SET_ERROR(ENXIO));
1861 #else
1862 zv = dev->si_drv2;
1863 #endif
1864
1865 volsize = zv->zv_volsize;
1866 /* uio_loffset == volsize isn't an error as its required for EOF processing. */
1867 if (uio->uio_resid > 0 &&
1868 (uio->uio_loffset < 0 || uio->uio_loffset > volsize))
1869 return (SET_ERROR(EIO));
1870
1871 #ifdef illumos
1872 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1873 error = physio(zvol_strategy, NULL, dev, B_READ,
1874 zvol_minphys, uio);
1875 return (error);
1876 }
1877 #endif
1878
1879 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock,
1880 uio->uio_loffset, uio->uio_resid, RL_READER);
1881 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1882 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1883
1884 /* don't read past the end */
1885 if (bytes > volsize - uio->uio_loffset)
1886 bytes = volsize - uio->uio_loffset;
1887
1888 error = dmu_read_uio_dnode(zv->zv_dn, uio, bytes);
1889 if (error) {
1890 /* convert checksum errors into IO errors */
1891 if (error == ECKSUM)
1892 error = SET_ERROR(EIO);
1893 break;
1894 }
1895 }
1896 rangelock_exit(lr);
1897
1898 return (error);
1899 }
1900
1901 #ifdef illumos
1902 /*ARGSUSED*/
1903 int
1904 zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
1905 {
1906 minor_t minor = getminor(dev);
1907 #else /* !illumos */
1908 int
1909 zvol_write(struct cdev *dev, struct uio *uio, int ioflag)
1910 {
1911 #endif /* illumos */
1912 zvol_state_t *zv;
1913 uint64_t volsize;
1914 int error = 0;
1915 boolean_t sync;
1916
1917 #ifdef illumos
1918 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1919 if (zv == NULL)
1920 return (SET_ERROR(ENXIO));
1921 #else
1922 zv = dev->si_drv2;
1923 #endif
1924
1925 volsize = zv->zv_volsize;
1926 /* uio_loffset == volsize isn't an error as its required for EOF processing. */
1927 if (uio->uio_resid > 0 &&
1928 (uio->uio_loffset < 0 || uio->uio_loffset > volsize))
1929 return (SET_ERROR(EIO));
1930
1931 #ifdef illumos
1932 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1933 error = physio(zvol_strategy, NULL, dev, B_WRITE,
1934 zvol_minphys, uio);
1935 return (error);
1936 }
1937
1938 sync = !(zv->zv_flags & ZVOL_WCE) ||
1939 #else
1940 sync = (ioflag & IO_SYNC) ||
1941 #endif
1942 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
1943
1944 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock,
1945 uio->uio_loffset, uio->uio_resid, RL_WRITER);
1946 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1947 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1948 uint64_t off = uio->uio_loffset;
1949 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1950
1951 if (bytes > volsize - off) /* don't write past the end */
1952 bytes = volsize - off;
1953
1954 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
1955 error = dmu_tx_assign(tx, TXG_WAIT);
1956 if (error) {
1957 dmu_tx_abort(tx);
1958 break;
1959 }
1960 error = dmu_write_uio_dnode(zv->zv_dn, uio, bytes, tx);
1961 if (error == 0)
1962 zvol_log_write(zv, tx, off, bytes, sync);
1963 dmu_tx_commit(tx);
1964
1965 if (error)
1966 break;
1967 }
1968 rangelock_exit(lr);
1969
1970 if (sync)
1971 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1972 return (error);
1973 }
1974
1975 #ifdef illumos
1976 int
1977 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
1978 {
1979 struct uuid uuid = EFI_RESERVED;
1980 efi_gpe_t gpe = { 0 };
1981 uint32_t crc;
1982 dk_efi_t efi;
1983 int length;
1984 char *ptr;
1985
1986 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
1987 return (SET_ERROR(EFAULT));
1988 ptr = (char *)(uintptr_t)efi.dki_data_64;
1989 length = efi.dki_length;
1990 /*
1991 * Some clients may attempt to request a PMBR for the
1992 * zvol. Currently this interface will return EINVAL to
1993 * such requests. These requests could be supported by
1994 * adding a check for lba == 0 and consing up an appropriate
1995 * PMBR.
1996 */
1997 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
1998 return (SET_ERROR(EINVAL));
1999
2000 gpe.efi_gpe_StartingLBA = LE_64(34ULL);
2001 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
2002 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
2003
2004 if (efi.dki_lba == 1) {
2005 efi_gpt_t gpt = { 0 };
2006
2007 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
2008 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
2009 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
2010 gpt.efi_gpt_MyLBA = LE_64(1ULL);
2011 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
2012 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
2013 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
2014 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
2015 gpt.efi_gpt_SizeOfPartitionEntry =
2016 LE_32(sizeof (efi_gpe_t));
2017 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
2018 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
2019 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
2020 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
2021 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
2022 flag))
2023 return (SET_ERROR(EFAULT));
2024 ptr += sizeof (gpt);
2025 length -= sizeof (gpt);
2026 }
2027 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
2028 length), flag))
2029 return (SET_ERROR(EFAULT));
2030 return (0);
2031 }
2032
2033 /*
2034 * BEGIN entry points to allow external callers access to the volume.
2035 */
2036 /*
2037 * Return the volume parameters needed for access from an external caller.
2038 * These values are invariant as long as the volume is held open.
2039 */
2040 int
2041 zvol_get_volume_params(minor_t minor, uint64_t *blksize,
2042 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl,
2043 void **rl_hdl, void **dnode_hdl)
2044 {
2045 zvol_state_t *zv;
2046
2047 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
2048 if (zv == NULL)
2049 return (SET_ERROR(ENXIO));
2050 if (zv->zv_flags & ZVOL_DUMPIFIED)
2051 return (SET_ERROR(ENXIO));
2052
2053 ASSERT(blksize && max_xfer_len && minor_hdl &&
2054 objset_hdl && zil_hdl && rl_hdl && dnode_hdl);
2055
2056 *blksize = zv->zv_volblocksize;
2057 *max_xfer_len = (uint64_t)zvol_maxphys;
2058 *minor_hdl = zv;
2059 *objset_hdl = zv->zv_objset;
2060 *zil_hdl = zv->zv_zilog;
2061 *rl_hdl = &zv->zv_rangelock;
2062 *dnode_hdl = zv->zv_dn;
2063 return (0);
2064 }
2065
2066 /*
2067 * Return the current volume size to an external caller.
2068 * The size can change while the volume is open.
2069 */
2070 uint64_t
2071 zvol_get_volume_size(void *minor_hdl)
2072 {
2073 zvol_state_t *zv = minor_hdl;
2074
2075 return (zv->zv_volsize);
2076 }
2077
2078 /*
2079 * Return the current WCE setting to an external caller.
2080 * The WCE setting can change while the volume is open.
2081 */
2082 int
2083 zvol_get_volume_wce(void *minor_hdl)
2084 {
2085 zvol_state_t *zv = minor_hdl;
2086
2087 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0);
2088 }
2089
2090 /*
2091 * Entry point for external callers to zvol_log_write
2092 */
2093 void
2094 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid,
2095 boolean_t sync)
2096 {
2097 zvol_state_t *zv = minor_hdl;
2098
2099 zvol_log_write(zv, tx, off, resid, sync);
2100 }
2101 /*
2102 * END entry points to allow external callers access to the volume.
2103 */
2104 #endif /* illumos */
2105
2106 /*
2107 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE.
2108 */
2109 static void
2110 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len,
2111 boolean_t sync)
2112 {
2113 itx_t *itx;
2114 lr_truncate_t *lr;
2115 zilog_t *zilog = zv->zv_zilog;
2116
2117 if (zil_replaying(zilog, tx))
2118 return;
2119
2120 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr));
2121 lr = (lr_truncate_t *)&itx->itx_lr;
2122 lr->lr_foid = ZVOL_OBJ;
2123 lr->lr_offset = off;
2124 lr->lr_length = len;
2125
2126 itx->itx_sync = (sync || zv->zv_sync_cnt != 0);
2127 zil_itx_assign(zilog, itx, tx);
2128 }
2129
2130 #ifdef illumos
2131 /*
2132 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I).
2133 * Also a dirtbag dkio ioctl for unmap/free-block functionality.
2134 */
2135 /*ARGSUSED*/
2136 int
2137 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
2138 {
2139 zvol_state_t *zv;
2140 struct dk_callback *dkc;
2141 int error = 0;
2142 locked_range_t *lr;
2143
2144 mutex_enter(&zfsdev_state_lock);
2145
2146 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL);
2147
2148 if (zv == NULL) {
2149 mutex_exit(&zfsdev_state_lock);
2150 return (SET_ERROR(ENXIO));
2151 }
2152 ASSERT(zv->zv_total_opens > 0);
2153
2154 switch (cmd) {
2155
2156 case DKIOCINFO:
2157 {
2158 struct dk_cinfo dki;
2159
2160 bzero(&dki, sizeof (dki));
2161 (void) strcpy(dki.dki_cname, "zvol");
2162 (void) strcpy(dki.dki_dname, "zvol");
2163 dki.dki_ctype = DKC_UNKNOWN;
2164 dki.dki_unit = getminor(dev);
2165 dki.dki_maxtransfer =
2166 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs);
2167 mutex_exit(&zfsdev_state_lock);
2168 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
2169 error = SET_ERROR(EFAULT);
2170 return (error);
2171 }
2172
2173 case DKIOCGMEDIAINFO:
2174 {
2175 struct dk_minfo dkm;
2176
2177 bzero(&dkm, sizeof (dkm));
2178 dkm.dki_lbsize = 1U << zv->zv_min_bs;
2179 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
2180 dkm.dki_media_type = DK_UNKNOWN;
2181 mutex_exit(&zfsdev_state_lock);
2182 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
2183 error = SET_ERROR(EFAULT);
2184 return (error);
2185 }
2186
2187 case DKIOCGMEDIAINFOEXT:
2188 {
2189 struct dk_minfo_ext dkmext;
2190
2191 bzero(&dkmext, sizeof (dkmext));
2192 dkmext.dki_lbsize = 1U << zv->zv_min_bs;
2193 dkmext.dki_pbsize = zv->zv_volblocksize;
2194 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
2195 dkmext.dki_media_type = DK_UNKNOWN;
2196 mutex_exit(&zfsdev_state_lock);
2197 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag))
2198 error = SET_ERROR(EFAULT);
2199 return (error);
2200 }
2201
2202 case DKIOCGETEFI:
2203 {
2204 uint64_t vs = zv->zv_volsize;
2205 uint8_t bs = zv->zv_min_bs;
2206
2207 mutex_exit(&zfsdev_state_lock);
2208 error = zvol_getefi((void *)arg, flag, vs, bs);
2209 return (error);
2210 }
2211
2212 case DKIOCFLUSHWRITECACHE:
2213 dkc = (struct dk_callback *)arg;
2214 mutex_exit(&zfsdev_state_lock);
2215 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2216 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
2217 (*dkc->dkc_callback)(dkc->dkc_cookie, error);
2218 error = 0;
2219 }
2220 return (error);
2221
2222 case DKIOCGETWCE:
2223 {
2224 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0;
2225 if (ddi_copyout(&wce, (void *)arg, sizeof (int),
2226 flag))
2227 error = SET_ERROR(EFAULT);
2228 break;
2229 }
2230 case DKIOCSETWCE:
2231 {
2232 int wce;
2233 if (ddi_copyin((void *)arg, &wce, sizeof (int),
2234 flag)) {
2235 error = SET_ERROR(EFAULT);
2236 break;
2237 }
2238 if (wce) {
2239 zv->zv_flags |= ZVOL_WCE;
2240 mutex_exit(&zfsdev_state_lock);
2241 } else {
2242 zv->zv_flags &= ~ZVOL_WCE;
2243 mutex_exit(&zfsdev_state_lock);
2244 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2245 }
2246 return (0);
2247 }
2248
2249 case DKIOCGGEOM:
2250 case DKIOCGVTOC:
2251 /*
2252 * commands using these (like prtvtoc) expect ENOTSUP
2253 * since we're emulating an EFI label
2254 */
2255 error = SET_ERROR(ENOTSUP);
2256 break;
2257
2258 case DKIOCDUMPINIT:
2259 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize,
2260 RL_WRITER);
2261 error = zvol_dumpify(zv);
2262 rangelock_exit(lr);
2263 break;
2264
2265 case DKIOCDUMPFINI:
2266 if (!(zv->zv_flags & ZVOL_DUMPIFIED))
2267 break;
2268 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize,
2269 RL_WRITER);
2270 error = zvol_dump_fini(zv);
2271 rangelock_exit(lr);
2272 break;
2273
2274 case DKIOCFREE:
2275 {
2276 dkioc_free_list_t *dfl;
2277 dmu_tx_t *tx;
2278
2279 if (!zvol_unmap_enabled)
2280 break;
2281
2282 if (!(flag & FKIOCTL)) {
2283 error = dfl_copyin((void *)arg, &dfl, flag, KM_SLEEP);
2284 if (error != 0)
2285 break;
2286 } else {
2287 dfl = (dkioc_free_list_t *)arg;
2288 ASSERT3U(dfl->dfl_num_exts, <=, DFL_COPYIN_MAX_EXTS);
2289 if (dfl->dfl_num_exts > DFL_COPYIN_MAX_EXTS) {
2290 error = SET_ERROR(EINVAL);
2291 break;
2292 }
2293 }
2294
2295 mutex_exit(&zfsdev_state_lock);
2296
2297 for (int i = 0; i < dfl->dfl_num_exts; i++) {
2298 uint64_t start = dfl->dfl_exts[i].dfle_start,
2299 length = dfl->dfl_exts[i].dfle_length,
2300 end = start + length;
2301
2302 /*
2303 * Apply Postel's Law to length-checking. If they
2304 * overshoot, just blank out until the end, if there's
2305 * a need to blank out anything.
2306 */
2307 if (start >= zv->zv_volsize)
2308 continue; /* No need to do anything... */
2309 if (end > zv->zv_volsize) {
2310 end = DMU_OBJECT_END;
2311 length = end - start;
2312 }
2313
2314 lr = rangelock_enter(&zv->zv_rangelock, start, length,
2315 RL_WRITER);
2316 tx = dmu_tx_create(zv->zv_objset);
2317 error = dmu_tx_assign(tx, TXG_WAIT);
2318 if (error != 0) {
2319 dmu_tx_abort(tx);
2320 } else {
2321 zvol_log_truncate(zv, tx, start, length,
2322 B_TRUE);
2323 dmu_tx_commit(tx);
2324 error = dmu_free_long_range(zv->zv_objset,
2325 ZVOL_OBJ, start, length);
2326 }
2327
2328 rangelock_exit(lr);
2329
2330 if (error != 0)
2331 break;
2332 }
2333
2334 /*
2335 * If the write-cache is disabled, 'sync' property
2336 * is set to 'always', or if the caller is asking for
2337 * a synchronous free, commit this operation to the zil.
2338 * This will sync any previous uncommitted writes to the
2339 * zvol object.
2340 * Can be overridden by the zvol_unmap_sync_enabled tunable.
2341 */
2342 if ((error == 0) && zvol_unmap_sync_enabled &&
2343 (!(zv->zv_flags & ZVOL_WCE) ||
2344 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) ||
2345 (dfl->dfl_flags & DF_WAIT_SYNC))) {
2346 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2347 }
2348
2349 if (!(flag & FKIOCTL))
2350 dfl_free(dfl);
2351
2352 return (error);
2353 }
2354
2355 default:
2356 error = SET_ERROR(ENOTTY);
2357 break;
2358
2359 }
2360 mutex_exit(&zfsdev_state_lock);
2361 return (error);
2362 }
2363 #endif /* illumos */
2364
2365 int
2366 zvol_busy(void)
2367 {
2368 return (zvol_minors != 0);
2369 }
2370
2371 void
2372 zvol_init(void)
2373 {
2374 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t),
2375 1) == 0);
2376 #ifdef illumos
2377 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL);
2378 #else
2379 ZFS_LOG(1, "ZVOL Initialized.");
2380 #endif
2381 }
2382
2383 void
2384 zvol_fini(void)
2385 {
2386 #ifdef illumos
2387 mutex_destroy(&zfsdev_state_lock);
2388 #endif
2389 ddi_soft_state_fini(&zfsdev_state);
2390 ZFS_LOG(1, "ZVOL Deinitialized.");
2391 }
2392
2393 #ifdef illumos
2394 /*ARGSUSED*/
2395 static int
2396 zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx)
2397 {
2398 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
2399
2400 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP))
2401 return (1);
2402 return (0);
2403 }
2404
2405 /*ARGSUSED*/
2406 static void
2407 zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx)
2408 {
2409 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
2410
2411 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx);
2412 }
2413
2414 static int
2415 zvol_dump_init(zvol_state_t *zv, boolean_t resize)
2416 {
2417 dmu_tx_t *tx;
2418 int error;
2419 objset_t *os = zv->zv_objset;
2420 spa_t *spa = dmu_objset_spa(os);
2421 vdev_t *vd = spa->spa_root_vdev;
2422 nvlist_t *nv = NULL;
2423 uint64_t version = spa_version(spa);
2424 uint64_t checksum, compress, refresrv, vbs, dedup;
2425
2426 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
2427 ASSERT(vd->vdev_ops == &vdev_root_ops);
2428
2429 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0,
2430 DMU_OBJECT_END);
2431 if (error != 0)
2432 return (error);
2433 /* wait for dmu_free_long_range to actually free the blocks */
2434 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
2435
2436 /*
2437 * If the pool on which the dump device is being initialized has more
2438 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is
2439 * enabled. If so, bump that feature's counter to indicate that the
2440 * feature is active. We also check the vdev type to handle the
2441 * following case:
2442 * # zpool create test raidz disk1 disk2 disk3
2443 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev),
2444 * the raidz vdev itself has 3 children.
2445 */
2446 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) {
2447 if (!spa_feature_is_enabled(spa,
2448 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP))
2449 return (SET_ERROR(ENOTSUP));
2450 (void) dsl_sync_task(spa_name(spa),
2451 zfs_mvdev_dump_feature_check,
2452 zfs_mvdev_dump_activate_feature_sync, NULL,
2453 2, ZFS_SPACE_CHECK_RESERVED);
2454 }
2455
2456 if (!resize) {
2457 error = dsl_prop_get_integer(zv->zv_name,
2458 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
2459 if (error == 0) {
2460 error = dsl_prop_get_integer(zv->zv_name,
2461 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum,
2462 NULL);
2463 }
2464 if (error == 0) {
2465 error = dsl_prop_get_integer(zv->zv_name,
2466 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
2467 &refresrv, NULL);
2468 }
2469 if (error == 0) {
2470 error = dsl_prop_get_integer(zv->zv_name,
2471 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs,
2472 NULL);
2473 }
2474 if (version >= SPA_VERSION_DEDUP && error == 0) {
2475 error = dsl_prop_get_integer(zv->zv_name,
2476 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL);
2477 }
2478 }
2479 if (error != 0)
2480 return (error);
2481
2482 tx = dmu_tx_create(os);
2483 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2484 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
2485 error = dmu_tx_assign(tx, TXG_WAIT);
2486 if (error != 0) {
2487 dmu_tx_abort(tx);
2488 return (error);
2489 }
2490
2491 /*
2492 * If we are resizing the dump device then we only need to
2493 * update the refreservation to match the newly updated
2494 * zvolsize. Otherwise, we save off the original state of the
2495 * zvol so that we can restore them if the zvol is ever undumpified.
2496 */
2497 if (resize) {
2498 error = zap_update(os, ZVOL_ZAP_OBJ,
2499 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
2500 &zv->zv_volsize, tx);
2501 } else {
2502 error = zap_update(os, ZVOL_ZAP_OBJ,
2503 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
2504 &compress, tx);
2505 if (error == 0) {
2506 error = zap_update(os, ZVOL_ZAP_OBJ,
2507 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1,
2508 &checksum, tx);
2509 }
2510 if (error == 0) {
2511 error = zap_update(os, ZVOL_ZAP_OBJ,
2512 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
2513 &refresrv, tx);
2514 }
2515 if (error == 0) {
2516 error = zap_update(os, ZVOL_ZAP_OBJ,
2517 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
2518 &vbs, tx);
2519 }
2520 if (error == 0) {
2521 error = dmu_object_set_blocksize(
2522 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx);
2523 }
2524 if (version >= SPA_VERSION_DEDUP && error == 0) {
2525 error = zap_update(os, ZVOL_ZAP_OBJ,
2526 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1,
2527 &dedup, tx);
2528 }
2529 if (error == 0)
2530 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE;
2531 }
2532 dmu_tx_commit(tx);
2533
2534 /*
2535 * We only need update the zvol's property if we are initializing
2536 * the dump area for the first time.
2537 */
2538 if (error == 0 && !resize) {
2539 /*
2540 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum
2541 * function. Otherwise, use the old default -- OFF.
2542 */
2543 checksum = spa_feature_is_active(spa,
2544 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY :
2545 ZIO_CHECKSUM_OFF;
2546
2547 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
2548 VERIFY(nvlist_add_uint64(nv,
2549 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
2550 VERIFY(nvlist_add_uint64(nv,
2551 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
2552 ZIO_COMPRESS_OFF) == 0);
2553 VERIFY(nvlist_add_uint64(nv,
2554 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
2555 checksum) == 0);
2556 if (version >= SPA_VERSION_DEDUP) {
2557 VERIFY(nvlist_add_uint64(nv,
2558 zfs_prop_to_name(ZFS_PROP_DEDUP),
2559 ZIO_CHECKSUM_OFF) == 0);
2560 }
2561
2562 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
2563 nv, NULL);
2564 nvlist_free(nv);
2565 }
2566
2567 /* Allocate the space for the dump */
2568 if (error == 0)
2569 error = zvol_prealloc(zv);
2570 return (error);
2571 }
2572
2573 static int
2574 zvol_dumpify(zvol_state_t *zv)
2575 {
2576 int error = 0;
2577 uint64_t dumpsize = 0;
2578 dmu_tx_t *tx;
2579 objset_t *os = zv->zv_objset;
2580
2581 if (zv->zv_flags & ZVOL_RDONLY)
2582 return (SET_ERROR(EROFS));
2583
2584 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
2585 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
2586 boolean_t resize = (dumpsize > 0);
2587
2588 if ((error = zvol_dump_init(zv, resize)) != 0) {
2589 (void) zvol_dump_fini(zv);
2590 return (error);
2591 }
2592 }
2593
2594 /*
2595 * Build up our lba mapping.
2596 */
2597 error = zvol_get_lbas(zv);
2598 if (error) {
2599 (void) zvol_dump_fini(zv);
2600 return (error);
2601 }
2602
2603 tx = dmu_tx_create(os);
2604 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2605 error = dmu_tx_assign(tx, TXG_WAIT);
2606 if (error) {
2607 dmu_tx_abort(tx);
2608 (void) zvol_dump_fini(zv);
2609 return (error);
2610 }
2611
2612 zv->zv_flags |= ZVOL_DUMPIFIED;
2613 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
2614 &zv->zv_volsize, tx);
2615 dmu_tx_commit(tx);
2616
2617 if (error) {
2618 (void) zvol_dump_fini(zv);
2619 return (error);
2620 }
2621
2622 txg_wait_synced(dmu_objset_pool(os), 0);
2623 return (0);
2624 }
2625
2626 static int
2627 zvol_dump_fini(zvol_state_t *zv)
2628 {
2629 dmu_tx_t *tx;
2630 objset_t *os = zv->zv_objset;
2631 nvlist_t *nv;
2632 int error = 0;
2633 uint64_t checksum, compress, refresrv, vbs, dedup;
2634 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
2635
2636 /*
2637 * Attempt to restore the zvol back to its pre-dumpified state.
2638 * This is a best-effort attempt as it's possible that not all
2639 * of these properties were initialized during the dumpify process
2640 * (i.e. error during zvol_dump_init).
2641 */
2642
2643 tx = dmu_tx_create(os);
2644 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2645 error = dmu_tx_assign(tx, TXG_WAIT);
2646 if (error) {
2647 dmu_tx_abort(tx);
2648 return (error);
2649 }
2650 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
2651 dmu_tx_commit(tx);
2652
2653 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2654 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
2655 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2656 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
2657 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2658 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
2659 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2660 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
2661
2662 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
2663 (void) nvlist_add_uint64(nv,
2664 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
2665 (void) nvlist_add_uint64(nv,
2666 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
2667 (void) nvlist_add_uint64(nv,
2668 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
2669 if (version >= SPA_VERSION_DEDUP &&
2670 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2671 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) {
2672 (void) nvlist_add_uint64(nv,
2673 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup);
2674 }
2675 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
2676 nv, NULL);
2677 nvlist_free(nv);
2678
2679 zvol_free_extents(zv);
2680 zv->zv_flags &= ~ZVOL_DUMPIFIED;
2681 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);
2682 /* wait for dmu_free_long_range to actually free the blocks */
2683 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
2684 tx = dmu_tx_create(os);
2685 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
2686 error = dmu_tx_assign(tx, TXG_WAIT);
2687 if (error) {
2688 dmu_tx_abort(tx);
2689 return (error);
2690 }
2691 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0)
2692 zv->zv_volblocksize = vbs;
2693 dmu_tx_commit(tx);
2694
2695 return (0);
2696 }
2697 #else /* !illumos */
2698
2699 static void
2700 zvol_geom_run(zvol_state_t *zv)
2701 {
2702 struct g_provider *pp;
2703
2704 pp = zv->zv_provider;
2705 g_error_provider(pp, 0);
2706
2707 kproc_kthread_add(zvol_geom_worker, zv, &system_proc, NULL, 0, 0,
2708 "zfskern", "zvol %s", pp->name + sizeof(ZVOL_DRIVER));
2709 }
2710
2711 static void
2712 zvol_geom_destroy(zvol_state_t *zv)
2713 {
2714 struct g_provider *pp;
2715
2716 g_topology_assert();
2717
2718 mtx_lock(&zv->zv_queue_mtx);
2719 zv->zv_state = 1;
2720 wakeup_one(&zv->zv_queue);
2721 while (zv->zv_state != 2)
2722 msleep(&zv->zv_state, &zv->zv_queue_mtx, 0, "zvol:w", 0);
2723 mtx_destroy(&zv->zv_queue_mtx);
2724
2725 pp = zv->zv_provider;
2726 zv->zv_provider = NULL;
2727 pp->private = NULL;
2728 g_wither_geom(pp->geom, ENXIO);
2729 }
2730
2731 static int
2732 zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace)
2733 {
2734 int count, error, flags;
2735
2736 g_topology_assert();
2737
2738 /*
2739 * To make it easier we expect either open or close, but not both
2740 * at the same time.
2741 */
2742 KASSERT((acr >= 0 && acw >= 0 && ace >= 0) ||
2743 (acr <= 0 && acw <= 0 && ace <= 0),
2744 ("Unsupported access request to %s (acr=%d, acw=%d, ace=%d).",
2745 pp->name, acr, acw, ace));
2746
2747 if (pp->private == NULL) {
2748 if (acr <= 0 && acw <= 0 && ace <= 0)
2749 return (0);
2750 return (pp->error);
2751 }
2752
2753 /*
2754 * We don't pass FEXCL flag to zvol_open()/zvol_close() if ace != 0,
2755 * because GEOM already handles that and handles it a bit differently.
2756 * GEOM allows for multiple read/exclusive consumers and ZFS allows
2757 * only one exclusive consumer, no matter if it is reader or writer.
2758 * I like better the way GEOM works so I'll leave it for GEOM to
2759 * decide what to do.
2760 */
2761
2762 count = acr + acw + ace;
2763 if (count == 0)
2764 return (0);
2765
2766 flags = 0;
2767 if (acr != 0 || ace != 0)
2768 flags |= FREAD;
2769 if (acw != 0)
2770 flags |= FWRITE;
2771
2772 g_topology_unlock();
2773 if (count > 0)
2774 error = zvol_open(pp, flags, count);
2775 else
2776 error = zvol_close(pp, flags, -count);
2777 g_topology_lock();
2778 return (error);
2779 }
2780
2781 static void
2782 zvol_geom_start(struct bio *bp)
2783 {
2784 zvol_state_t *zv;
2785 boolean_t first;
2786
2787 zv = bp->bio_to->private;
2788 ASSERT(zv != NULL);
2789 switch (bp->bio_cmd) {
2790 case BIO_FLUSH:
2791 if (!THREAD_CAN_SLEEP())
2792 goto enqueue;
2793 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2794 g_io_deliver(bp, 0);
2795 break;
2796 case BIO_READ:
2797 case BIO_WRITE:
2798 case BIO_DELETE:
2799 if (!THREAD_CAN_SLEEP())
2800 goto enqueue;
2801 zvol_strategy(bp);
2802 break;
2803 case BIO_GETATTR: {
2804 spa_t *spa = dmu_objset_spa(zv->zv_objset);
2805 uint64_t refd, avail, usedobjs, availobjs, val;
2806
2807 if (g_handleattr_int(bp, "GEOM::candelete", 1))
2808 return;
2809 if (strcmp(bp->bio_attribute, "blocksavail") == 0) {
2810 dmu_objset_space(zv->zv_objset, &refd, &avail,
2811 &usedobjs, &availobjs);
2812 if (g_handleattr_off_t(bp, "blocksavail",
2813 avail / DEV_BSIZE))
2814 return;
2815 } else if (strcmp(bp->bio_attribute, "blocksused") == 0) {
2816 dmu_objset_space(zv->zv_objset, &refd, &avail,
2817 &usedobjs, &availobjs);
2818 if (g_handleattr_off_t(bp, "blocksused",
2819 refd / DEV_BSIZE))
2820 return;
2821 } else if (strcmp(bp->bio_attribute, "poolblocksavail") == 0) {
2822 avail = metaslab_class_get_space(spa_normal_class(spa));
2823 avail -= metaslab_class_get_alloc(spa_normal_class(spa));
2824 if (g_handleattr_off_t(bp, "poolblocksavail",
2825 avail / DEV_BSIZE))
2826 return;
2827 } else if (strcmp(bp->bio_attribute, "poolblocksused") == 0) {
2828 refd = metaslab_class_get_alloc(spa_normal_class(spa));
2829 if (g_handleattr_off_t(bp, "poolblocksused",
2830 refd / DEV_BSIZE))
2831 return;
2832 }
2833 /* FALLTHROUGH */
2834 }
2835 default:
2836 g_io_deliver(bp, EOPNOTSUPP);
2837 break;
2838 }
2839 return;
2840
2841 enqueue:
2842 mtx_lock(&zv->zv_queue_mtx);
2843 first = (bioq_first(&zv->zv_queue) == NULL);
2844 bioq_insert_tail(&zv->zv_queue, bp);
2845 mtx_unlock(&zv->zv_queue_mtx);
2846 if (first)
2847 wakeup_one(&zv->zv_queue);
2848 }
2849
2850 static void
2851 zvol_geom_worker(void *arg)
2852 {
2853 zvol_state_t *zv;
2854 struct bio *bp;
2855
2856 thread_lock(curthread);
2857 sched_prio(curthread, PRIBIO);
2858 thread_unlock(curthread);
2859
2860 zv = arg;
2861 for (;;) {
2862 mtx_lock(&zv->zv_queue_mtx);
2863 bp = bioq_takefirst(&zv->zv_queue);
2864 if (bp == NULL) {
2865 if (zv->zv_state == 1) {
2866 zv->zv_state = 2;
2867 wakeup(&zv->zv_state);
2868 mtx_unlock(&zv->zv_queue_mtx);
2869 kthread_exit();
2870 }
2871 msleep(&zv->zv_queue, &zv->zv_queue_mtx, PRIBIO | PDROP,
2872 "zvol:io", 0);
2873 continue;
2874 }
2875 mtx_unlock(&zv->zv_queue_mtx);
2876 switch (bp->bio_cmd) {
2877 case BIO_FLUSH:
2878 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2879 g_io_deliver(bp, 0);
2880 break;
2881 case BIO_READ:
2882 case BIO_WRITE:
2883 case BIO_DELETE:
2884 zvol_strategy(bp);
2885 break;
2886 default:
2887 g_io_deliver(bp, EOPNOTSUPP);
2888 break;
2889 }
2890 }
2891 }
2892
2893 extern boolean_t dataset_name_hidden(const char *name);
2894
2895 static int
2896 zvol_create_snapshots(objset_t *os, const char *name)
2897 {
2898 uint64_t cookie, obj;
2899 char *sname;
2900 int error, len;
2901
2902 cookie = obj = 0;
2903 sname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2904
2905 #if 0
2906 (void) dmu_objset_find(name, dmu_objset_prefetch, NULL,
2907 DS_FIND_SNAPSHOTS);
2908 #endif
2909
2910 for (;;) {
2911 len = snprintf(sname, MAXPATHLEN, "%s@", name);
2912 if (len >= MAXPATHLEN) {
2913 dmu_objset_rele(os, FTAG);
2914 error = ENAMETOOLONG;
2915 break;
2916 }
2917
2918 dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
2919 error = dmu_snapshot_list_next(os, MAXPATHLEN - len,
2920 sname + len, &obj, &cookie, NULL);
2921 dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
2922 if (error != 0) {
2923 if (error == ENOENT)
2924 error = 0;
2925 break;
2926 }
2927
2928 error = zvol_create_minor(sname);
2929 if (error != 0 && error != EEXIST) {
2930 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
2931 sname, error);
2932 break;
2933 }
2934 }
2935
2936 kmem_free(sname, MAXPATHLEN);
2937 return (error);
2938 }
2939
2940 int
2941 zvol_create_minors_impl(const char *name)
2942 {
2943 uint64_t cookie;
2944 objset_t *os;
2945 char *osname, *p;
2946 int error, len;
2947
2948 if (dataset_name_hidden(name))
2949 return (0);
2950
2951 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
2952 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
2953 name, error);
2954 return (error);
2955 }
2956 if (dmu_objset_type(os) == DMU_OST_ZVOL) {
2957 dsl_dataset_long_hold(os->os_dsl_dataset, FTAG);
2958 dsl_pool_rele(dmu_objset_pool(os), FTAG);
2959 error = zvol_create_minor(name);
2960 if (error == 0 || error == EEXIST) {
2961 error = zvol_create_snapshots(os, name);
2962 } else {
2963 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
2964 name, error);
2965 }
2966 dsl_dataset_long_rele(os->os_dsl_dataset, FTAG);
2967 dsl_dataset_rele(os->os_dsl_dataset, FTAG);
2968 return (error);
2969 }
2970 if (dmu_objset_type(os) != DMU_OST_ZFS) {
2971 dmu_objset_rele(os, FTAG);
2972 return (0);
2973 }
2974
2975 osname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2976 if (snprintf(osname, MAXPATHLEN, "%s/", name) >= MAXPATHLEN) {
2977 dmu_objset_rele(os, FTAG);
2978 kmem_free(osname, MAXPATHLEN);
2979 return (ENOENT);
2980 }
2981 p = osname + strlen(osname);
2982 len = MAXPATHLEN - (p - osname);
2983
2984 #if 0
2985 /* Prefetch the datasets. */
2986 cookie = 0;
2987 while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0) {
2988 if (!dataset_name_hidden(osname))
2989 (void) dmu_objset_prefetch(osname, NULL);
2990 }
2991 #endif
2992
2993 cookie = 0;
2994 while (dmu_dir_list_next(os, MAXPATHLEN - (p - osname), p, NULL,
2995 &cookie) == 0) {
2996 dmu_objset_rele(os, FTAG);
2997 (void)zvol_create_minors_impl(osname);
2998 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
2999 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
3000 name, error);
3001 return (error);
3002 }
3003 }
3004
3005 dmu_objset_rele(os, FTAG);
3006 kmem_free(osname, MAXPATHLEN);
3007 return (0);
3008 }
3009
3010 static void
3011 zvol_rename_minor(zvol_state_t *zv, const char *newname)
3012 {
3013 struct g_geom *gp;
3014 struct g_provider *pp;
3015 struct cdev *dev;
3016
3017 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
3018
3019 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
3020 g_topology_lock();
3021 pp = zv->zv_provider;
3022 ASSERT(pp != NULL);
3023 gp = pp->geom;
3024 ASSERT(gp != NULL);
3025
3026 zv->zv_provider = NULL;
3027 g_wither_provider(pp, ENXIO);
3028
3029 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, newname);
3030 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND;
3031 pp->sectorsize = DEV_BSIZE;
3032 pp->mediasize = zv->zv_volsize;
3033 pp->private = zv;
3034 zv->zv_provider = pp;
3035 g_error_provider(pp, 0);
3036 g_topology_unlock();
3037 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
3038 struct make_dev_args args;
3039
3040 if ((dev = zv->zv_dev) != NULL) {
3041 zv->zv_dev = NULL;
3042 destroy_dev(dev);
3043 if (zv->zv_total_opens > 0) {
3044 zv->zv_flags &= ~ZVOL_EXCL;
3045 zv->zv_total_opens = 0;
3046 zvol_last_close(zv);
3047 }
3048 }
3049
3050 make_dev_args_init(&args);
3051 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
3052 args.mda_devsw = &zvol_cdevsw;
3053 args.mda_cr = NULL;
3054 args.mda_uid = UID_ROOT;
3055 args.mda_gid = GID_OPERATOR;
3056 args.mda_mode = 0640;
3057 args.mda_si_drv2 = zv;
3058 if (make_dev_s(&args, &zv->zv_dev,
3059 "%s/%s", ZVOL_DRIVER, newname) == 0)
3060 zv->zv_dev->si_iosize_max = MAXPHYS;
3061 }
3062 strlcpy(zv->zv_name, newname, sizeof(zv->zv_name));
3063 }
3064
3065 void
3066 zvol_rename_minors_impl(const char *oldname, const char *newname)
3067 {
3068 char name[MAXPATHLEN];
3069 struct g_provider *pp;
3070 struct g_geom *gp;
3071 size_t oldnamelen, newnamelen;
3072 zvol_state_t *zv;
3073 char *namebuf;
3074 boolean_t locked = B_FALSE;
3075
3076 oldnamelen = strlen(oldname);
3077 newnamelen = strlen(newname);
3078
3079 /* See comment in zvol_open(). */
3080 if (!MUTEX_HELD(&zfsdev_state_lock)) {
3081 mutex_enter(&zfsdev_state_lock);
3082 locked = B_TRUE;
3083 }
3084
3085 LIST_FOREACH(zv, &all_zvols, zv_links) {
3086 if (strcmp(zv->zv_name, oldname) == 0) {
3087 zvol_rename_minor(zv, newname);
3088 } else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 &&
3089 (zv->zv_name[oldnamelen] == '/' ||
3090 zv->zv_name[oldnamelen] == '@')) {
3091 snprintf(name, sizeof(name), "%s%c%s", newname,
3092 zv->zv_name[oldnamelen],
3093 zv->zv_name + oldnamelen + 1);
3094 zvol_rename_minor(zv, name);
3095 }
3096 }
3097
3098 if (locked)
3099 mutex_exit(&zfsdev_state_lock);
3100 }
3101
3102 static zvol_task_t *
3103 zvol_task_alloc(zvol_async_op_t op, const char *name1, const char *name2)
3104 {
3105 zvol_task_t *task;
3106 char *delim;
3107
3108 task = kmem_zalloc(sizeof (zvol_task_t), KM_SLEEP);
3109 task->op = op;
3110 delim = strchr(name1, '/');
3111 strlcpy(task->pool, name1, delim ? (delim - name1 + 1) : MAXNAMELEN);
3112
3113 strlcpy(task->name1, name1, MAXNAMELEN);
3114 if (name2 != NULL)
3115 strlcpy(task->name2, name2, MAXNAMELEN);
3116
3117 return (task);
3118 }
3119
3120 static void
3121 zvol_task_free(zvol_task_t *task)
3122 {
3123 kmem_free(task, sizeof (zvol_task_t));
3124 }
3125
3126 /*
3127 * The worker thread function performed asynchronously.
3128 */
3129 static void
3130 zvol_task_cb(void *param)
3131 {
3132 zvol_task_t *task = (zvol_task_t *)param;
3133
3134 switch (task->op) {
3135 case ZVOL_ASYNC_CREATE_MINORS:
3136 (void) zvol_create_minors_impl(task->name1);
3137 break;
3138 case ZVOL_ASYNC_REMOVE_MINORS:
3139 zvol_remove_minors_impl(task->name1);
3140 break;
3141 case ZVOL_ASYNC_RENAME_MINORS:
3142 zvol_rename_minors_impl(task->name1, task->name2);
3143 break;
3144 default:
3145 VERIFY(0);
3146 break;
3147 }
3148
3149 zvol_task_free(task);
3150 }
3151
3152 static void
3153 zvol_minors_helper(spa_t *spa, zvol_async_op_t op, const char *name1,
3154 const char *name2)
3155 {
3156 zvol_task_t *task;
3157
3158 if (dataset_name_hidden(name1))
3159 return;
3160 if (name2 != NULL && dataset_name_hidden(name2))
3161 return;
3162 task = zvol_task_alloc(op, name1, name2);
3163 (void)taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP);
3164 }
3165
3166 void
3167 zvol_create_minors(spa_t *spa, const char *name)
3168 {
3169 zvol_minors_helper(spa, ZVOL_ASYNC_CREATE_MINORS, name, NULL);
3170 }
3171
3172 void
3173 zvol_remove_minors(spa_t *spa, const char *name)
3174 {
3175 zvol_minors_helper(spa, ZVOL_ASYNC_REMOVE_MINORS, name, NULL);
3176 }
3177
3178 void
3179 zvol_rename_minors(spa_t *spa, const char *oldname, const char *newname)
3180 {
3181 zvol_minors_helper(spa, ZVOL_ASYNC_RENAME_MINORS, oldname, newname);
3182 }
3183
3184 static int
3185 zvol_d_open(struct cdev *dev, int flags, int fmt, struct thread *td)
3186 {
3187 zvol_state_t *zv = dev->si_drv2;
3188 int err = 0;
3189
3190 mutex_enter(&zfsdev_state_lock);
3191 if (zv->zv_total_opens == 0)
3192 err = zvol_first_open(zv);
3193 if (err) {
3194 mutex_exit(&zfsdev_state_lock);
3195 return (err);
3196 }
3197 if ((flags & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
3198 err = SET_ERROR(EROFS);
3199 goto out;
3200 }
3201 if (zv->zv_flags & ZVOL_EXCL) {
3202 err = SET_ERROR(EBUSY);
3203 goto out;
3204 }
3205 #ifdef FEXCL
3206 if (flags & FEXCL) {
3207 if (zv->zv_total_opens != 0) {
3208 err = SET_ERROR(EBUSY);
3209 goto out;
3210 }
3211 zv->zv_flags |= ZVOL_EXCL;
3212 }
3213 #endif
3214
3215 zv->zv_total_opens++;
3216 if (flags & (FSYNC | FDSYNC)) {
3217 zv->zv_sync_cnt++;
3218 if (zv->zv_sync_cnt == 1)
3219 zil_async_to_sync(zv->zv_zilog, ZVOL_OBJ);
3220 }
3221 mutex_exit(&zfsdev_state_lock);
3222 return (err);
3223 out:
3224 if (zv->zv_total_opens == 0)
3225 zvol_last_close(zv);
3226 mutex_exit(&zfsdev_state_lock);
3227 return (err);
3228 }
3229
3230 static int
3231 zvol_d_close(struct cdev *dev, int flags, int fmt, struct thread *td)
3232 {
3233 zvol_state_t *zv = dev->si_drv2;
3234
3235 mutex_enter(&zfsdev_state_lock);
3236 if (zv->zv_flags & ZVOL_EXCL) {
3237 ASSERT(zv->zv_total_opens == 1);
3238 zv->zv_flags &= ~ZVOL_EXCL;
3239 }
3240
3241 /*
3242 * If the open count is zero, this is a spurious close.
3243 * That indicates a bug in the kernel / DDI framework.
3244 */
3245 ASSERT(zv->zv_total_opens != 0);
3246
3247 /*
3248 * You may get multiple opens, but only one close.
3249 */
3250 zv->zv_total_opens--;
3251 if (flags & (FSYNC | FDSYNC))
3252 zv->zv_sync_cnt--;
3253
3254 if (zv->zv_total_opens == 0)
3255 zvol_last_close(zv);
3256
3257 mutex_exit(&zfsdev_state_lock);
3258 return (0);
3259 }
3260
3261 static int
3262 zvol_d_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
3263 {
3264 zvol_state_t *zv;
3265 locked_range_t *lr;
3266 off_t offset, length;
3267 int i, error;
3268 boolean_t sync;
3269
3270 zv = dev->si_drv2;
3271
3272 error = 0;
3273 KASSERT(zv->zv_total_opens > 0,
3274 ("Device with zero access count in zvol_d_ioctl"));
3275
3276 i = IOCPARM_LEN(cmd);
3277 switch (cmd) {
3278 case DIOCGSECTORSIZE:
3279 *(u_int *)data = DEV_BSIZE;
3280 break;
3281 case DIOCGMEDIASIZE:
3282 *(off_t *)data = zv->zv_volsize;
3283 break;
3284 case DIOCGFLUSH:
3285 zil_commit(zv->zv_zilog, ZVOL_OBJ);
3286 break;
3287 case DIOCGDELETE:
3288 if (!zvol_unmap_enabled)
3289 break;
3290
3291 offset = ((off_t *)data)[0];
3292 length = ((off_t *)data)[1];
3293 if ((offset % DEV_BSIZE) != 0 || (length % DEV_BSIZE) != 0 ||
3294 offset < 0 || offset >= zv->zv_volsize ||
3295 length <= 0) {
3296 printf("%s: offset=%jd length=%jd\n", __func__, offset,
3297 length);
3298 error = EINVAL;
3299 break;
3300 }
3301
3302 lr = rangelock_enter(&zv->zv_rangelock, offset, length,
3303 RL_WRITER);
3304 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
3305 error = dmu_tx_assign(tx, TXG_WAIT);
3306 if (error != 0) {
3307 sync = FALSE;
3308 dmu_tx_abort(tx);
3309 } else {
3310 sync = (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
3311 zvol_log_truncate(zv, tx, offset, length, sync);
3312 dmu_tx_commit(tx);
3313 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
3314 offset, length);
3315 }
3316 rangelock_exit(lr);
3317 if (sync)
3318 zil_commit(zv->zv_zilog, ZVOL_OBJ);
3319 break;
3320 case DIOCGSTRIPESIZE:
3321 *(off_t *)data = zv->zv_volblocksize;
3322 break;
3323 case DIOCGSTRIPEOFFSET:
3324 *(off_t *)data = 0;
3325 break;
3326 case DIOCGATTR: {
3327 spa_t *spa = dmu_objset_spa(zv->zv_objset);
3328 struct diocgattr_arg *arg = (struct diocgattr_arg *)data;
3329 uint64_t refd, avail, usedobjs, availobjs;
3330
3331 if (strcmp(arg->name, "GEOM::candelete") == 0)
3332 arg->value.i = 1;
3333 else if (strcmp(arg->name, "blocksavail") == 0) {
3334 dmu_objset_space(zv->zv_objset, &refd, &avail,
3335 &usedobjs, &availobjs);
3336 arg->value.off = avail / DEV_BSIZE;
3337 } else if (strcmp(arg->name, "blocksused") == 0) {
3338 dmu_objset_space(zv->zv_objset, &refd, &avail,
3339 &usedobjs, &availobjs);
3340 arg->value.off = refd / DEV_BSIZE;
3341 } else if (strcmp(arg->name, "poolblocksavail") == 0) {
3342 avail = metaslab_class_get_space(spa_normal_class(spa));
3343 avail -= metaslab_class_get_alloc(spa_normal_class(spa));
3344 arg->value.off = avail / DEV_BSIZE;
3345 } else if (strcmp(arg->name, "poolblocksused") == 0) {
3346 refd = metaslab_class_get_alloc(spa_normal_class(spa));
3347 arg->value.off = refd / DEV_BSIZE;
3348 } else
3349 error = ENOIOCTL;
3350 break;
3351 }
3352 case FIOSEEKHOLE:
3353 case FIOSEEKDATA: {
3354 off_t *off = (off_t *)data;
3355 uint64_t noff;
3356 boolean_t hole;
3357
3358 hole = (cmd == FIOSEEKHOLE);
3359 noff = *off;
3360 error = dmu_offset_next(zv->zv_objset, ZVOL_OBJ, hole, &noff);
3361 *off = noff;
3362 break;
3363 }
3364 default:
3365 error = ENOIOCTL;
3366 }
3367
3368 return (error);
3369 }
3370 #endif /* illumos */
3371