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2130 zvol DKIOCFREE uses nested DMU transactions
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--- old/usr/src/uts/common/fs/zfs/zvol.c
+++ new/usr/src/uts/common/fs/zfs/zvol.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 *
24 24 * Portions Copyright 2010 Robert Milkowski
25 25 *
26 26 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
27 27 */
28 28
29 29 /*
30 30 * ZFS volume emulation driver.
31 31 *
32 32 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
33 33 * Volumes are accessed through the symbolic links named:
34 34 *
35 35 * /dev/zvol/dsk/<pool_name>/<dataset_name>
36 36 * /dev/zvol/rdsk/<pool_name>/<dataset_name>
37 37 *
38 38 * These links are created by the /dev filesystem (sdev_zvolops.c).
39 39 * Volumes are persistent through reboot. No user command needs to be
40 40 * run before opening and using a device.
41 41 */
42 42
43 43 #include <sys/types.h>
44 44 #include <sys/param.h>
45 45 #include <sys/errno.h>
46 46 #include <sys/uio.h>
47 47 #include <sys/buf.h>
48 48 #include <sys/modctl.h>
49 49 #include <sys/open.h>
50 50 #include <sys/kmem.h>
51 51 #include <sys/conf.h>
52 52 #include <sys/cmn_err.h>
53 53 #include <sys/stat.h>
54 54 #include <sys/zap.h>
55 55 #include <sys/spa.h>
56 56 #include <sys/zio.h>
57 57 #include <sys/dmu_traverse.h>
58 58 #include <sys/dnode.h>
59 59 #include <sys/dsl_dataset.h>
60 60 #include <sys/dsl_prop.h>
61 61 #include <sys/dkio.h>
62 62 #include <sys/efi_partition.h>
63 63 #include <sys/byteorder.h>
64 64 #include <sys/pathname.h>
65 65 #include <sys/ddi.h>
66 66 #include <sys/sunddi.h>
67 67 #include <sys/crc32.h>
68 68 #include <sys/dirent.h>
69 69 #include <sys/policy.h>
70 70 #include <sys/fs/zfs.h>
71 71 #include <sys/zfs_ioctl.h>
72 72 #include <sys/mkdev.h>
73 73 #include <sys/zil.h>
74 74 #include <sys/refcount.h>
75 75 #include <sys/zfs_znode.h>
76 76 #include <sys/zfs_rlock.h>
77 77 #include <sys/vdev_disk.h>
78 78 #include <sys/vdev_impl.h>
79 79 #include <sys/zvol.h>
80 80 #include <sys/dumphdr.h>
81 81 #include <sys/zil_impl.h>
82 82
83 83 #include "zfs_namecheck.h"
84 84
85 85 void *zfsdev_state;
86 86 static char *zvol_tag = "zvol_tag";
87 87
88 88 #define ZVOL_DUMPSIZE "dumpsize"
89 89
90 90 /*
91 91 * This lock protects the zfsdev_state structure from being modified
92 92 * while it's being used, e.g. an open that comes in before a create
93 93 * finishes. It also protects temporary opens of the dataset so that,
94 94 * e.g., an open doesn't get a spurious EBUSY.
95 95 */
96 96 kmutex_t zfsdev_state_lock;
97 97 static uint32_t zvol_minors;
98 98
99 99 typedef struct zvol_extent {
100 100 list_node_t ze_node;
101 101 dva_t ze_dva; /* dva associated with this extent */
102 102 uint64_t ze_nblks; /* number of blocks in extent */
103 103 } zvol_extent_t;
104 104
105 105 /*
106 106 * The in-core state of each volume.
107 107 */
108 108 typedef struct zvol_state {
109 109 char zv_name[MAXPATHLEN]; /* pool/dd name */
110 110 uint64_t zv_volsize; /* amount of space we advertise */
111 111 uint64_t zv_volblocksize; /* volume block size */
112 112 minor_t zv_minor; /* minor number */
113 113 uint8_t zv_min_bs; /* minimum addressable block shift */
114 114 uint8_t zv_flags; /* readonly, dumpified, etc. */
115 115 objset_t *zv_objset; /* objset handle */
116 116 uint32_t zv_open_count[OTYPCNT]; /* open counts */
117 117 uint32_t zv_total_opens; /* total open count */
118 118 zilog_t *zv_zilog; /* ZIL handle */
119 119 list_t zv_extents; /* List of extents for dump */
120 120 znode_t zv_znode; /* for range locking */
121 121 dmu_buf_t *zv_dbuf; /* bonus handle */
122 122 } zvol_state_t;
123 123
124 124 /*
125 125 * zvol specific flags
126 126 */
127 127 #define ZVOL_RDONLY 0x1
128 128 #define ZVOL_DUMPIFIED 0x2
129 129 #define ZVOL_EXCL 0x4
130 130 #define ZVOL_WCE 0x8
131 131
132 132 /*
133 133 * zvol maximum transfer in one DMU tx.
134 134 */
135 135 int zvol_maxphys = DMU_MAX_ACCESS/2;
136 136
137 137 extern int zfs_set_prop_nvlist(const char *, zprop_source_t,
138 138 nvlist_t *, nvlist_t **);
139 139 static int zvol_remove_zv(zvol_state_t *);
140 140 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio);
141 141 static int zvol_dumpify(zvol_state_t *zv);
142 142 static int zvol_dump_fini(zvol_state_t *zv);
143 143 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
144 144
145 145 static void
146 146 zvol_size_changed(uint64_t volsize, major_t maj, minor_t min)
147 147 {
148 148 dev_t dev = makedevice(maj, min);
149 149
150 150 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
151 151 "Size", volsize) == DDI_SUCCESS);
152 152 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
153 153 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS);
154 154
155 155 /* Notify specfs to invalidate the cached size */
156 156 spec_size_invalidate(dev, VBLK);
157 157 spec_size_invalidate(dev, VCHR);
158 158 }
159 159
160 160 int
161 161 zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
162 162 {
163 163 if (volsize == 0)
164 164 return (EINVAL);
165 165
166 166 if (volsize % blocksize != 0)
167 167 return (EINVAL);
168 168
169 169 #ifdef _ILP32
170 170 if (volsize - 1 > SPEC_MAXOFFSET_T)
171 171 return (EOVERFLOW);
172 172 #endif
173 173 return (0);
174 174 }
175 175
176 176 int
177 177 zvol_check_volblocksize(uint64_t volblocksize)
178 178 {
179 179 if (volblocksize < SPA_MINBLOCKSIZE ||
180 180 volblocksize > SPA_MAXBLOCKSIZE ||
181 181 !ISP2(volblocksize))
182 182 return (EDOM);
183 183
184 184 return (0);
185 185 }
186 186
187 187 int
188 188 zvol_get_stats(objset_t *os, nvlist_t *nv)
189 189 {
190 190 int error;
191 191 dmu_object_info_t doi;
192 192 uint64_t val;
193 193
194 194 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
195 195 if (error)
196 196 return (error);
197 197
198 198 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
199 199
200 200 error = dmu_object_info(os, ZVOL_OBJ, &doi);
201 201
202 202 if (error == 0) {
203 203 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
204 204 doi.doi_data_block_size);
205 205 }
206 206
207 207 return (error);
208 208 }
209 209
210 210 static zvol_state_t *
211 211 zvol_minor_lookup(const char *name)
212 212 {
213 213 minor_t minor;
214 214 zvol_state_t *zv;
215 215
216 216 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
217 217
218 218 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
219 219 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
220 220 if (zv == NULL)
221 221 continue;
222 222 if (strcmp(zv->zv_name, name) == 0)
223 223 return (zv);
224 224 }
225 225
226 226 return (NULL);
227 227 }
228 228
229 229 /* extent mapping arg */
230 230 struct maparg {
231 231 zvol_state_t *ma_zv;
232 232 uint64_t ma_blks;
233 233 };
234 234
235 235 /*ARGSUSED*/
236 236 static int
237 237 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
238 238 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
239 239 {
240 240 struct maparg *ma = arg;
241 241 zvol_extent_t *ze;
242 242 int bs = ma->ma_zv->zv_volblocksize;
243 243
244 244 if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
245 245 return (0);
246 246
247 247 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
248 248 ma->ma_blks++;
249 249
250 250 /* Abort immediately if we have encountered gang blocks */
251 251 if (BP_IS_GANG(bp))
252 252 return (EFRAGS);
253 253
254 254 /*
255 255 * See if the block is at the end of the previous extent.
256 256 */
257 257 ze = list_tail(&ma->ma_zv->zv_extents);
258 258 if (ze &&
259 259 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
260 260 DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
261 261 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
262 262 ze->ze_nblks++;
263 263 return (0);
264 264 }
265 265
266 266 dprintf_bp(bp, "%s", "next blkptr:");
267 267
268 268 /* start a new extent */
269 269 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
270 270 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */
271 271 ze->ze_nblks = 1;
272 272 list_insert_tail(&ma->ma_zv->zv_extents, ze);
273 273 return (0);
274 274 }
275 275
276 276 static void
277 277 zvol_free_extents(zvol_state_t *zv)
278 278 {
279 279 zvol_extent_t *ze;
280 280
281 281 while (ze = list_head(&zv->zv_extents)) {
282 282 list_remove(&zv->zv_extents, ze);
283 283 kmem_free(ze, sizeof (zvol_extent_t));
284 284 }
285 285 }
286 286
287 287 static int
288 288 zvol_get_lbas(zvol_state_t *zv)
289 289 {
290 290 objset_t *os = zv->zv_objset;
291 291 struct maparg ma;
292 292 int err;
293 293
294 294 ma.ma_zv = zv;
295 295 ma.ma_blks = 0;
296 296 zvol_free_extents(zv);
297 297
298 298 /* commit any in-flight changes before traversing the dataset */
299 299 txg_wait_synced(dmu_objset_pool(os), 0);
300 300 err = traverse_dataset(dmu_objset_ds(os), 0,
301 301 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
302 302 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
303 303 zvol_free_extents(zv);
304 304 return (err ? err : EIO);
305 305 }
306 306
307 307 return (0);
308 308 }
309 309
310 310 /* ARGSUSED */
311 311 void
312 312 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
313 313 {
314 314 zfs_creat_t *zct = arg;
315 315 nvlist_t *nvprops = zct->zct_props;
316 316 int error;
317 317 uint64_t volblocksize, volsize;
318 318
319 319 VERIFY(nvlist_lookup_uint64(nvprops,
320 320 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
321 321 if (nvlist_lookup_uint64(nvprops,
322 322 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
323 323 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
324 324
325 325 /*
326 326 * These properties must be removed from the list so the generic
327 327 * property setting step won't apply to them.
328 328 */
329 329 VERIFY(nvlist_remove_all(nvprops,
330 330 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
331 331 (void) nvlist_remove_all(nvprops,
332 332 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
333 333
334 334 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
335 335 DMU_OT_NONE, 0, tx);
336 336 ASSERT(error == 0);
337 337
338 338 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
339 339 DMU_OT_NONE, 0, tx);
340 340 ASSERT(error == 0);
341 341
342 342 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
343 343 ASSERT(error == 0);
344 344 }
345 345
346 346 /*
347 347 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we
348 348 * implement DKIOCFREE/free-long-range.
349 349 */
350 350 static int
351 351 zvol_replay_truncate(zvol_state_t *zv, lr_truncate_t *lr, boolean_t byteswap)
352 352 {
353 353 uint64_t offset, length;
354 354
355 355 if (byteswap)
356 356 byteswap_uint64_array(lr, sizeof (*lr));
357 357
358 358 offset = lr->lr_offset;
359 359 length = lr->lr_length;
360 360
361 361 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length));
362 362 }
363 363
364 364 /*
365 365 * Replay a TX_WRITE ZIL transaction that didn't get committed
366 366 * after a system failure
367 367 */
368 368 static int
369 369 zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap)
370 370 {
371 371 objset_t *os = zv->zv_objset;
372 372 char *data = (char *)(lr + 1); /* data follows lr_write_t */
373 373 uint64_t offset, length;
374 374 dmu_tx_t *tx;
375 375 int error;
376 376
377 377 if (byteswap)
378 378 byteswap_uint64_array(lr, sizeof (*lr));
379 379
380 380 offset = lr->lr_offset;
381 381 length = lr->lr_length;
382 382
383 383 /* If it's a dmu_sync() block, write the whole block */
384 384 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
385 385 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
386 386 if (length < blocksize) {
387 387 offset -= offset % blocksize;
388 388 length = blocksize;
389 389 }
390 390 }
391 391
392 392 tx = dmu_tx_create(os);
393 393 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length);
394 394 error = dmu_tx_assign(tx, TXG_WAIT);
395 395 if (error) {
396 396 dmu_tx_abort(tx);
397 397 } else {
398 398 dmu_write(os, ZVOL_OBJ, offset, length, data, tx);
399 399 dmu_tx_commit(tx);
400 400 }
401 401
402 402 return (error);
403 403 }
404 404
405 405 /* ARGSUSED */
406 406 static int
407 407 zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap)
408 408 {
409 409 return (ENOTSUP);
410 410 }
411 411
412 412 /*
413 413 * Callback vectors for replaying records.
414 414 * Only TX_WRITE and TX_TRUNCATE are needed for zvol.
415 415 */
416 416 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
417 417 zvol_replay_err, /* 0 no such transaction type */
418 418 zvol_replay_err, /* TX_CREATE */
419 419 zvol_replay_err, /* TX_MKDIR */
420 420 zvol_replay_err, /* TX_MKXATTR */
421 421 zvol_replay_err, /* TX_SYMLINK */
422 422 zvol_replay_err, /* TX_REMOVE */
423 423 zvol_replay_err, /* TX_RMDIR */
424 424 zvol_replay_err, /* TX_LINK */
425 425 zvol_replay_err, /* TX_RENAME */
426 426 zvol_replay_write, /* TX_WRITE */
427 427 zvol_replay_truncate, /* TX_TRUNCATE */
428 428 zvol_replay_err, /* TX_SETATTR */
429 429 zvol_replay_err, /* TX_ACL */
430 430 zvol_replay_err, /* TX_CREATE_ACL */
431 431 zvol_replay_err, /* TX_CREATE_ATTR */
432 432 zvol_replay_err, /* TX_CREATE_ACL_ATTR */
433 433 zvol_replay_err, /* TX_MKDIR_ACL */
434 434 zvol_replay_err, /* TX_MKDIR_ATTR */
435 435 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */
436 436 zvol_replay_err, /* TX_WRITE2 */
437 437 };
438 438
439 439 int
440 440 zvol_name2minor(const char *name, minor_t *minor)
441 441 {
442 442 zvol_state_t *zv;
443 443
444 444 mutex_enter(&zfsdev_state_lock);
445 445 zv = zvol_minor_lookup(name);
446 446 if (minor && zv)
447 447 *minor = zv->zv_minor;
448 448 mutex_exit(&zfsdev_state_lock);
449 449 return (zv ? 0 : -1);
450 450 }
451 451
452 452 /*
453 453 * Create a minor node (plus a whole lot more) for the specified volume.
454 454 */
455 455 int
456 456 zvol_create_minor(const char *name)
457 457 {
458 458 zfs_soft_state_t *zs;
459 459 zvol_state_t *zv;
460 460 objset_t *os;
461 461 dmu_object_info_t doi;
462 462 minor_t minor = 0;
463 463 char chrbuf[30], blkbuf[30];
464 464 int error;
465 465
466 466 mutex_enter(&zfsdev_state_lock);
467 467
468 468 if (zvol_minor_lookup(name) != NULL) {
469 469 mutex_exit(&zfsdev_state_lock);
470 470 return (EEXIST);
471 471 }
472 472
473 473 /* lie and say we're read-only */
474 474 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os);
475 475
476 476 if (error) {
477 477 mutex_exit(&zfsdev_state_lock);
478 478 return (error);
479 479 }
480 480
481 481 if ((minor = zfsdev_minor_alloc()) == 0) {
482 482 dmu_objset_disown(os, FTAG);
483 483 mutex_exit(&zfsdev_state_lock);
484 484 return (ENXIO);
485 485 }
486 486
487 487 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) {
488 488 dmu_objset_disown(os, FTAG);
489 489 mutex_exit(&zfsdev_state_lock);
490 490 return (EAGAIN);
491 491 }
492 492 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
493 493 (char *)name);
494 494
495 495 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor);
496 496
497 497 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
498 498 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
499 499 ddi_soft_state_free(zfsdev_state, minor);
500 500 dmu_objset_disown(os, FTAG);
501 501 mutex_exit(&zfsdev_state_lock);
502 502 return (EAGAIN);
503 503 }
504 504
505 505 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor);
506 506
507 507 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
508 508 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
509 509 ddi_remove_minor_node(zfs_dip, chrbuf);
510 510 ddi_soft_state_free(zfsdev_state, minor);
511 511 dmu_objset_disown(os, FTAG);
512 512 mutex_exit(&zfsdev_state_lock);
513 513 return (EAGAIN);
514 514 }
515 515
516 516 zs = ddi_get_soft_state(zfsdev_state, minor);
517 517 zs->zss_type = ZSST_ZVOL;
518 518 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
519 519 (void) strlcpy(zv->zv_name, name, MAXPATHLEN);
520 520 zv->zv_min_bs = DEV_BSHIFT;
521 521 zv->zv_minor = minor;
522 522 zv->zv_objset = os;
523 523 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os)))
524 524 zv->zv_flags |= ZVOL_RDONLY;
525 525 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL);
526 526 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare,
527 527 sizeof (rl_t), offsetof(rl_t, r_node));
528 528 list_create(&zv->zv_extents, sizeof (zvol_extent_t),
529 529 offsetof(zvol_extent_t, ze_node));
530 530 /* get and cache the blocksize */
531 531 error = dmu_object_info(os, ZVOL_OBJ, &doi);
532 532 ASSERT(error == 0);
533 533 zv->zv_volblocksize = doi.doi_data_block_size;
534 534
535 535 if (spa_writeable(dmu_objset_spa(os))) {
536 536 if (zil_replay_disable)
537 537 zil_destroy(dmu_objset_zil(os), B_FALSE);
538 538 else
539 539 zil_replay(os, zv, zvol_replay_vector);
540 540 }
541 541 dmu_objset_disown(os, FTAG);
542 542 zv->zv_objset = NULL;
543 543
544 544 zvol_minors++;
545 545
546 546 mutex_exit(&zfsdev_state_lock);
547 547
548 548 return (0);
549 549 }
550 550
551 551 /*
552 552 * Remove minor node for the specified volume.
553 553 */
554 554 static int
555 555 zvol_remove_zv(zvol_state_t *zv)
556 556 {
557 557 char nmbuf[20];
558 558 minor_t minor = zv->zv_minor;
559 559
560 560 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
561 561 if (zv->zv_total_opens != 0)
562 562 return (EBUSY);
563 563
564 564 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor);
565 565 ddi_remove_minor_node(zfs_dip, nmbuf);
566 566
567 567 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor);
568 568 ddi_remove_minor_node(zfs_dip, nmbuf);
569 569
570 570 avl_destroy(&zv->zv_znode.z_range_avl);
571 571 mutex_destroy(&zv->zv_znode.z_range_lock);
572 572
573 573 kmem_free(zv, sizeof (zvol_state_t));
574 574
575 575 ddi_soft_state_free(zfsdev_state, minor);
576 576
577 577 zvol_minors--;
578 578 return (0);
579 579 }
580 580
581 581 int
582 582 zvol_remove_minor(const char *name)
583 583 {
584 584 zvol_state_t *zv;
585 585 int rc;
586 586
587 587 mutex_enter(&zfsdev_state_lock);
588 588 if ((zv = zvol_minor_lookup(name)) == NULL) {
589 589 mutex_exit(&zfsdev_state_lock);
590 590 return (ENXIO);
591 591 }
592 592 rc = zvol_remove_zv(zv);
593 593 mutex_exit(&zfsdev_state_lock);
594 594 return (rc);
595 595 }
596 596
597 597 int
598 598 zvol_first_open(zvol_state_t *zv)
599 599 {
600 600 objset_t *os;
601 601 uint64_t volsize;
602 602 int error;
603 603 uint64_t readonly;
604 604
605 605 /* lie and say we're read-only */
606 606 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE,
607 607 zvol_tag, &os);
608 608 if (error)
609 609 return (error);
610 610
611 611 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
612 612 if (error) {
613 613 ASSERT(error == 0);
614 614 dmu_objset_disown(os, zvol_tag);
615 615 return (error);
616 616 }
617 617 zv->zv_objset = os;
618 618 error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf);
619 619 if (error) {
620 620 dmu_objset_disown(os, zvol_tag);
621 621 return (error);
622 622 }
623 623 zv->zv_volsize = volsize;
624 624 zv->zv_zilog = zil_open(os, zvol_get_data);
625 625 zvol_size_changed(zv->zv_volsize, ddi_driver_major(zfs_dip),
626 626 zv->zv_minor);
627 627
628 628 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly,
629 629 NULL) == 0);
630 630 if (readonly || dmu_objset_is_snapshot(os) ||
631 631 !spa_writeable(dmu_objset_spa(os)))
632 632 zv->zv_flags |= ZVOL_RDONLY;
633 633 else
634 634 zv->zv_flags &= ~ZVOL_RDONLY;
635 635 return (error);
636 636 }
637 637
638 638 void
639 639 zvol_last_close(zvol_state_t *zv)
640 640 {
641 641 zil_close(zv->zv_zilog);
642 642 zv->zv_zilog = NULL;
643 643 dmu_buf_rele(zv->zv_dbuf, zvol_tag);
644 644 zv->zv_dbuf = NULL;
645 645 dmu_objset_disown(zv->zv_objset, zvol_tag);
646 646 zv->zv_objset = NULL;
647 647 }
648 648
649 649 int
650 650 zvol_prealloc(zvol_state_t *zv)
651 651 {
652 652 objset_t *os = zv->zv_objset;
653 653 dmu_tx_t *tx;
654 654 uint64_t refd, avail, usedobjs, availobjs;
655 655 uint64_t resid = zv->zv_volsize;
656 656 uint64_t off = 0;
657 657
658 658 /* Check the space usage before attempting to allocate the space */
659 659 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
660 660 if (avail < zv->zv_volsize)
661 661 return (ENOSPC);
662 662
663 663 /* Free old extents if they exist */
664 664 zvol_free_extents(zv);
665 665
666 666 while (resid != 0) {
667 667 int error;
668 668 uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE);
669 669
670 670 tx = dmu_tx_create(os);
671 671 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
672 672 error = dmu_tx_assign(tx, TXG_WAIT);
673 673 if (error) {
674 674 dmu_tx_abort(tx);
675 675 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
676 676 return (error);
677 677 }
678 678 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
679 679 dmu_tx_commit(tx);
680 680 off += bytes;
681 681 resid -= bytes;
682 682 }
683 683 txg_wait_synced(dmu_objset_pool(os), 0);
684 684
685 685 return (0);
686 686 }
687 687
688 688 int
689 689 zvol_update_volsize(objset_t *os, uint64_t volsize)
690 690 {
691 691 dmu_tx_t *tx;
692 692 int error;
693 693
694 694 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
695 695
696 696 tx = dmu_tx_create(os);
697 697 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
698 698 error = dmu_tx_assign(tx, TXG_WAIT);
699 699 if (error) {
700 700 dmu_tx_abort(tx);
701 701 return (error);
702 702 }
703 703
704 704 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1,
705 705 &volsize, tx);
706 706 dmu_tx_commit(tx);
707 707
708 708 if (error == 0)
709 709 error = dmu_free_long_range(os,
710 710 ZVOL_OBJ, volsize, DMU_OBJECT_END);
711 711 return (error);
712 712 }
713 713
714 714 void
715 715 zvol_remove_minors(const char *name)
716 716 {
717 717 zvol_state_t *zv;
718 718 char *namebuf;
719 719 minor_t minor;
720 720
721 721 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP);
722 722 (void) strncpy(namebuf, name, strlen(name));
723 723 (void) strcat(namebuf, "/");
724 724 mutex_enter(&zfsdev_state_lock);
725 725 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
726 726
727 727 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
728 728 if (zv == NULL)
729 729 continue;
730 730 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0)
731 731 (void) zvol_remove_zv(zv);
732 732 }
733 733 kmem_free(namebuf, strlen(name) + 2);
734 734
735 735 mutex_exit(&zfsdev_state_lock);
736 736 }
737 737
738 738 int
739 739 zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
740 740 {
741 741 zvol_state_t *zv = NULL;
742 742 objset_t *os;
743 743 int error;
744 744 dmu_object_info_t doi;
745 745 uint64_t old_volsize = 0ULL;
746 746 uint64_t readonly;
747 747
748 748 mutex_enter(&zfsdev_state_lock);
749 749 zv = zvol_minor_lookup(name);
750 750 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
751 751 mutex_exit(&zfsdev_state_lock);
752 752 return (error);
753 753 }
754 754
755 755 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 ||
756 756 (error = zvol_check_volsize(volsize,
757 757 doi.doi_data_block_size)) != 0)
758 758 goto out;
759 759
760 760 VERIFY(dsl_prop_get_integer(name, "readonly", &readonly,
761 761 NULL) == 0);
762 762 if (readonly) {
763 763 error = EROFS;
764 764 goto out;
765 765 }
766 766
767 767 error = zvol_update_volsize(os, volsize);
768 768 /*
769 769 * Reinitialize the dump area to the new size. If we
770 770 * failed to resize the dump area then restore it back to
771 771 * its original size.
772 772 */
773 773 if (zv && error == 0) {
774 774 if (zv->zv_flags & ZVOL_DUMPIFIED) {
775 775 old_volsize = zv->zv_volsize;
776 776 zv->zv_volsize = volsize;
777 777 if ((error = zvol_dumpify(zv)) != 0 ||
778 778 (error = dumpvp_resize()) != 0) {
779 779 (void) zvol_update_volsize(os, old_volsize);
780 780 zv->zv_volsize = old_volsize;
781 781 error = zvol_dumpify(zv);
782 782 }
783 783 }
784 784 if (error == 0) {
785 785 zv->zv_volsize = volsize;
786 786 zvol_size_changed(volsize, maj, zv->zv_minor);
787 787 }
788 788 }
789 789
790 790 /*
791 791 * Generate a LUN expansion event.
792 792 */
793 793 if (zv && error == 0) {
794 794 sysevent_id_t eid;
795 795 nvlist_t *attr;
796 796 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
797 797
798 798 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV,
799 799 zv->zv_minor);
800 800
801 801 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
802 802 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
803 803
804 804 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
805 805 ESC_DEV_DLE, attr, &eid, DDI_SLEEP);
806 806
807 807 nvlist_free(attr);
808 808 kmem_free(physpath, MAXPATHLEN);
809 809 }
810 810
811 811 out:
812 812 dmu_objset_rele(os, FTAG);
813 813
814 814 mutex_exit(&zfsdev_state_lock);
815 815
816 816 return (error);
817 817 }
818 818
819 819 /*ARGSUSED*/
820 820 int
821 821 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr)
822 822 {
823 823 zvol_state_t *zv;
824 824 int err = 0;
825 825
826 826 mutex_enter(&zfsdev_state_lock);
827 827
828 828 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL);
829 829 if (zv == NULL) {
830 830 mutex_exit(&zfsdev_state_lock);
831 831 return (ENXIO);
832 832 }
833 833
834 834 if (zv->zv_total_opens == 0)
835 835 err = zvol_first_open(zv);
836 836 if (err) {
837 837 mutex_exit(&zfsdev_state_lock);
838 838 return (err);
839 839 }
840 840 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
841 841 err = EROFS;
842 842 goto out;
843 843 }
844 844 if (zv->zv_flags & ZVOL_EXCL) {
845 845 err = EBUSY;
846 846 goto out;
847 847 }
848 848 if (flag & FEXCL) {
849 849 if (zv->zv_total_opens != 0) {
850 850 err = EBUSY;
851 851 goto out;
852 852 }
853 853 zv->zv_flags |= ZVOL_EXCL;
854 854 }
855 855
856 856 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) {
857 857 zv->zv_open_count[otyp]++;
858 858 zv->zv_total_opens++;
859 859 }
860 860 mutex_exit(&zfsdev_state_lock);
861 861
862 862 return (err);
863 863 out:
864 864 if (zv->zv_total_opens == 0)
865 865 zvol_last_close(zv);
866 866 mutex_exit(&zfsdev_state_lock);
867 867 return (err);
868 868 }
869 869
870 870 /*ARGSUSED*/
871 871 int
872 872 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr)
873 873 {
874 874 minor_t minor = getminor(dev);
875 875 zvol_state_t *zv;
876 876 int error = 0;
877 877
878 878 mutex_enter(&zfsdev_state_lock);
879 879
880 880 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
881 881 if (zv == NULL) {
882 882 mutex_exit(&zfsdev_state_lock);
883 883 return (ENXIO);
884 884 }
885 885
886 886 if (zv->zv_flags & ZVOL_EXCL) {
887 887 ASSERT(zv->zv_total_opens == 1);
888 888 zv->zv_flags &= ~ZVOL_EXCL;
889 889 }
890 890
891 891 /*
892 892 * If the open count is zero, this is a spurious close.
893 893 * That indicates a bug in the kernel / DDI framework.
894 894 */
895 895 ASSERT(zv->zv_open_count[otyp] != 0);
896 896 ASSERT(zv->zv_total_opens != 0);
897 897
898 898 /*
899 899 * You may get multiple opens, but only one close.
900 900 */
901 901 zv->zv_open_count[otyp]--;
902 902 zv->zv_total_opens--;
903 903
904 904 if (zv->zv_total_opens == 0)
905 905 zvol_last_close(zv);
906 906
907 907 mutex_exit(&zfsdev_state_lock);
908 908 return (error);
909 909 }
910 910
911 911 static void
912 912 zvol_get_done(zgd_t *zgd, int error)
913 913 {
914 914 if (zgd->zgd_db)
915 915 dmu_buf_rele(zgd->zgd_db, zgd);
916 916
917 917 zfs_range_unlock(zgd->zgd_rl);
918 918
919 919 if (error == 0 && zgd->zgd_bp)
920 920 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
921 921
922 922 kmem_free(zgd, sizeof (zgd_t));
923 923 }
924 924
925 925 /*
926 926 * Get data to generate a TX_WRITE intent log record.
927 927 */
928 928 static int
929 929 zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
930 930 {
931 931 zvol_state_t *zv = arg;
932 932 objset_t *os = zv->zv_objset;
933 933 uint64_t object = ZVOL_OBJ;
934 934 uint64_t offset = lr->lr_offset;
935 935 uint64_t size = lr->lr_length; /* length of user data */
936 936 blkptr_t *bp = &lr->lr_blkptr;
937 937 dmu_buf_t *db;
938 938 zgd_t *zgd;
939 939 int error;
940 940
941 941 ASSERT(zio != NULL);
942 942 ASSERT(size != 0);
943 943
944 944 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
945 945 zgd->zgd_zilog = zv->zv_zilog;
946 946 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER);
947 947
948 948 /*
949 949 * Write records come in two flavors: immediate and indirect.
950 950 * For small writes it's cheaper to store the data with the
951 951 * log record (immediate); for large writes it's cheaper to
952 952 * sync the data and get a pointer to it (indirect) so that
953 953 * we don't have to write the data twice.
954 954 */
955 955 if (buf != NULL) { /* immediate write */
956 956 error = dmu_read(os, object, offset, size, buf,
957 957 DMU_READ_NO_PREFETCH);
958 958 } else {
959 959 size = zv->zv_volblocksize;
960 960 offset = P2ALIGN(offset, size);
961 961 error = dmu_buf_hold(os, object, offset, zgd, &db,
962 962 DMU_READ_NO_PREFETCH);
963 963 if (error == 0) {
964 964 zgd->zgd_db = db;
965 965 zgd->zgd_bp = bp;
966 966
967 967 ASSERT(db->db_offset == offset);
968 968 ASSERT(db->db_size == size);
969 969
970 970 error = dmu_sync(zio, lr->lr_common.lrc_txg,
971 971 zvol_get_done, zgd);
972 972
973 973 if (error == 0)
974 974 return (0);
975 975 }
976 976 }
977 977
978 978 zvol_get_done(zgd, error);
979 979
980 980 return (error);
981 981 }
982 982
983 983 /*
984 984 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
985 985 *
986 986 * We store data in the log buffers if it's small enough.
987 987 * Otherwise we will later flush the data out via dmu_sync().
988 988 */
989 989 ssize_t zvol_immediate_write_sz = 32768;
990 990
991 991 static void
992 992 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid,
993 993 boolean_t sync)
994 994 {
995 995 uint32_t blocksize = zv->zv_volblocksize;
996 996 zilog_t *zilog = zv->zv_zilog;
997 997 boolean_t slogging;
998 998 ssize_t immediate_write_sz;
999 999
1000 1000 if (zil_replaying(zilog, tx))
1001 1001 return;
1002 1002
1003 1003 immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
1004 1004 ? 0 : zvol_immediate_write_sz;
1005 1005
1006 1006 slogging = spa_has_slogs(zilog->zl_spa) &&
1007 1007 (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY);
1008 1008
1009 1009 while (resid) {
1010 1010 itx_t *itx;
1011 1011 lr_write_t *lr;
1012 1012 ssize_t len;
1013 1013 itx_wr_state_t write_state;
1014 1014
1015 1015 /*
1016 1016 * Unlike zfs_log_write() we can be called with
1017 1017 * upto DMU_MAX_ACCESS/2 (5MB) writes.
1018 1018 */
1019 1019 if (blocksize > immediate_write_sz && !slogging &&
1020 1020 resid >= blocksize && off % blocksize == 0) {
1021 1021 write_state = WR_INDIRECT; /* uses dmu_sync */
1022 1022 len = blocksize;
1023 1023 } else if (sync) {
1024 1024 write_state = WR_COPIED;
1025 1025 len = MIN(ZIL_MAX_LOG_DATA, resid);
1026 1026 } else {
1027 1027 write_state = WR_NEED_COPY;
1028 1028 len = MIN(ZIL_MAX_LOG_DATA, resid);
1029 1029 }
1030 1030
1031 1031 itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
1032 1032 (write_state == WR_COPIED ? len : 0));
1033 1033 lr = (lr_write_t *)&itx->itx_lr;
1034 1034 if (write_state == WR_COPIED && dmu_read(zv->zv_objset,
1035 1035 ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) {
1036 1036 zil_itx_destroy(itx);
1037 1037 itx = zil_itx_create(TX_WRITE, sizeof (*lr));
1038 1038 lr = (lr_write_t *)&itx->itx_lr;
1039 1039 write_state = WR_NEED_COPY;
1040 1040 }
1041 1041
1042 1042 itx->itx_wr_state = write_state;
1043 1043 if (write_state == WR_NEED_COPY)
1044 1044 itx->itx_sod += len;
1045 1045 lr->lr_foid = ZVOL_OBJ;
1046 1046 lr->lr_offset = off;
1047 1047 lr->lr_length = len;
1048 1048 lr->lr_blkoff = 0;
1049 1049 BP_ZERO(&lr->lr_blkptr);
1050 1050
1051 1051 itx->itx_private = zv;
1052 1052 itx->itx_sync = sync;
1053 1053
1054 1054 zil_itx_assign(zilog, itx, tx);
1055 1055
1056 1056 off += len;
1057 1057 resid -= len;
1058 1058 }
1059 1059 }
1060 1060
1061 1061 static int
1062 1062 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size,
1063 1063 boolean_t doread, boolean_t isdump)
1064 1064 {
1065 1065 vdev_disk_t *dvd;
1066 1066 int c;
1067 1067 int numerrors = 0;
1068 1068
1069 1069 for (c = 0; c < vd->vdev_children; c++) {
1070 1070 ASSERT(vd->vdev_ops == &vdev_mirror_ops ||
1071 1071 vd->vdev_ops == &vdev_replacing_ops ||
1072 1072 vd->vdev_ops == &vdev_spare_ops);
1073 1073 int err = zvol_dumpio_vdev(vd->vdev_child[c],
1074 1074 addr, offset, size, doread, isdump);
1075 1075 if (err != 0) {
1076 1076 numerrors++;
1077 1077 } else if (doread) {
1078 1078 break;
1079 1079 }
1080 1080 }
1081 1081
1082 1082 if (!vd->vdev_ops->vdev_op_leaf)
1083 1083 return (numerrors < vd->vdev_children ? 0 : EIO);
1084 1084
1085 1085 if (doread && !vdev_readable(vd))
1086 1086 return (EIO);
1087 1087 else if (!doread && !vdev_writeable(vd))
1088 1088 return (EIO);
1089 1089
1090 1090 dvd = vd->vdev_tsd;
1091 1091 ASSERT3P(dvd, !=, NULL);
1092 1092 offset += VDEV_LABEL_START_SIZE;
1093 1093
1094 1094 if (ddi_in_panic() || isdump) {
1095 1095 ASSERT(!doread);
1096 1096 if (doread)
1097 1097 return (EIO);
1098 1098 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
1099 1099 lbtodb(size)));
1100 1100 } else {
1101 1101 return (vdev_disk_physio(dvd->vd_lh, addr, size, offset,
1102 1102 doread ? B_READ : B_WRITE));
1103 1103 }
1104 1104 }
1105 1105
1106 1106 static int
1107 1107 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
1108 1108 boolean_t doread, boolean_t isdump)
1109 1109 {
1110 1110 vdev_t *vd;
1111 1111 int error;
1112 1112 zvol_extent_t *ze;
1113 1113 spa_t *spa = dmu_objset_spa(zv->zv_objset);
1114 1114
1115 1115 /* Must be sector aligned, and not stradle a block boundary. */
1116 1116 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
1117 1117 P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
1118 1118 return (EINVAL);
1119 1119 }
1120 1120 ASSERT(size <= zv->zv_volblocksize);
1121 1121
1122 1122 /* Locate the extent this belongs to */
1123 1123 ze = list_head(&zv->zv_extents);
1124 1124 while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
1125 1125 offset -= ze->ze_nblks * zv->zv_volblocksize;
1126 1126 ze = list_next(&zv->zv_extents, ze);
1127 1127 }
1128 1128
1129 1129 if (!ddi_in_panic())
1130 1130 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
1131 1131
1132 1132 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
1133 1133 offset += DVA_GET_OFFSET(&ze->ze_dva);
1134 1134 error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump);
1135 1135
1136 1136 if (!ddi_in_panic())
1137 1137 spa_config_exit(spa, SCL_STATE, FTAG);
1138 1138
1139 1139 return (error);
1140 1140 }
1141 1141
1142 1142 int
1143 1143 zvol_strategy(buf_t *bp)
1144 1144 {
1145 1145 zfs_soft_state_t *zs = NULL;
1146 1146 zvol_state_t *zv;
1147 1147 uint64_t off, volsize;
1148 1148 size_t resid;
1149 1149 char *addr;
1150 1150 objset_t *os;
1151 1151 rl_t *rl;
1152 1152 int error = 0;
1153 1153 boolean_t doread = bp->b_flags & B_READ;
1154 1154 boolean_t is_dump;
1155 1155 boolean_t sync;
1156 1156
1157 1157 if (getminor(bp->b_edev) == 0) {
1158 1158 error = EINVAL;
1159 1159 } else {
1160 1160 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev));
1161 1161 if (zs == NULL)
1162 1162 error = ENXIO;
1163 1163 else if (zs->zss_type != ZSST_ZVOL)
1164 1164 error = EINVAL;
1165 1165 }
1166 1166
1167 1167 if (error) {
1168 1168 bioerror(bp, error);
1169 1169 biodone(bp);
1170 1170 return (0);
1171 1171 }
1172 1172
1173 1173 zv = zs->zss_data;
1174 1174
1175 1175 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) {
1176 1176 bioerror(bp, EROFS);
1177 1177 biodone(bp);
1178 1178 return (0);
1179 1179 }
1180 1180
1181 1181 off = ldbtob(bp->b_blkno);
1182 1182 volsize = zv->zv_volsize;
1183 1183
1184 1184 os = zv->zv_objset;
1185 1185 ASSERT(os != NULL);
1186 1186
1187 1187 bp_mapin(bp);
1188 1188 addr = bp->b_un.b_addr;
1189 1189 resid = bp->b_bcount;
1190 1190
1191 1191 if (resid > 0 && (off < 0 || off >= volsize)) {
1192 1192 bioerror(bp, EIO);
1193 1193 biodone(bp);
1194 1194 return (0);
1195 1195 }
1196 1196
1197 1197 is_dump = zv->zv_flags & ZVOL_DUMPIFIED;
1198 1198 sync = ((!(bp->b_flags & B_ASYNC) &&
1199 1199 !(zv->zv_flags & ZVOL_WCE)) ||
1200 1200 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) &&
1201 1201 !doread && !is_dump;
1202 1202
1203 1203 /*
1204 1204 * There must be no buffer changes when doing a dmu_sync() because
1205 1205 * we can't change the data whilst calculating the checksum.
1206 1206 */
1207 1207 rl = zfs_range_lock(&zv->zv_znode, off, resid,
1208 1208 doread ? RL_READER : RL_WRITER);
1209 1209
1210 1210 while (resid != 0 && off < volsize) {
1211 1211 size_t size = MIN(resid, zvol_maxphys);
1212 1212 if (is_dump) {
1213 1213 size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
1214 1214 error = zvol_dumpio(zv, addr, off, size,
1215 1215 doread, B_FALSE);
1216 1216 } else if (doread) {
1217 1217 error = dmu_read(os, ZVOL_OBJ, off, size, addr,
1218 1218 DMU_READ_PREFETCH);
1219 1219 } else {
1220 1220 dmu_tx_t *tx = dmu_tx_create(os);
1221 1221 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size);
1222 1222 error = dmu_tx_assign(tx, TXG_WAIT);
1223 1223 if (error) {
1224 1224 dmu_tx_abort(tx);
1225 1225 } else {
1226 1226 dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
1227 1227 zvol_log_write(zv, tx, off, size, sync);
1228 1228 dmu_tx_commit(tx);
1229 1229 }
1230 1230 }
1231 1231 if (error) {
1232 1232 /* convert checksum errors into IO errors */
1233 1233 if (error == ECKSUM)
1234 1234 error = EIO;
1235 1235 break;
1236 1236 }
1237 1237 off += size;
1238 1238 addr += size;
1239 1239 resid -= size;
1240 1240 }
1241 1241 zfs_range_unlock(rl);
1242 1242
1243 1243 if ((bp->b_resid = resid) == bp->b_bcount)
1244 1244 bioerror(bp, off > volsize ? EINVAL : error);
1245 1245
1246 1246 if (sync)
1247 1247 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1248 1248 biodone(bp);
1249 1249
1250 1250 return (0);
1251 1251 }
1252 1252
1253 1253 /*
1254 1254 * Set the buffer count to the zvol maximum transfer.
1255 1255 * Using our own routine instead of the default minphys()
1256 1256 * means that for larger writes we write bigger buffers on X86
1257 1257 * (128K instead of 56K) and flush the disk write cache less often
1258 1258 * (every zvol_maxphys - currently 1MB) instead of minphys (currently
1259 1259 * 56K on X86 and 128K on sparc).
1260 1260 */
1261 1261 void
1262 1262 zvol_minphys(struct buf *bp)
1263 1263 {
1264 1264 if (bp->b_bcount > zvol_maxphys)
1265 1265 bp->b_bcount = zvol_maxphys;
1266 1266 }
1267 1267
1268 1268 int
1269 1269 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
1270 1270 {
1271 1271 minor_t minor = getminor(dev);
1272 1272 zvol_state_t *zv;
1273 1273 int error = 0;
1274 1274 uint64_t size;
1275 1275 uint64_t boff;
1276 1276 uint64_t resid;
1277 1277
1278 1278 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1279 1279 if (zv == NULL)
1280 1280 return (ENXIO);
1281 1281
1282 1282 boff = ldbtob(blkno);
1283 1283 resid = ldbtob(nblocks);
1284 1284
1285 1285 VERIFY3U(boff + resid, <=, zv->zv_volsize);
1286 1286
1287 1287 while (resid) {
1288 1288 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
1289 1289 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
1290 1290 if (error)
1291 1291 break;
1292 1292 boff += size;
1293 1293 addr += size;
1294 1294 resid -= size;
1295 1295 }
1296 1296
1297 1297 return (error);
1298 1298 }
1299 1299
1300 1300 /*ARGSUSED*/
1301 1301 int
1302 1302 zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
1303 1303 {
1304 1304 minor_t minor = getminor(dev);
1305 1305 zvol_state_t *zv;
1306 1306 uint64_t volsize;
1307 1307 rl_t *rl;
1308 1308 int error = 0;
1309 1309
1310 1310 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1311 1311 if (zv == NULL)
1312 1312 return (ENXIO);
1313 1313
1314 1314 volsize = zv->zv_volsize;
1315 1315 if (uio->uio_resid > 0 &&
1316 1316 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
1317 1317 return (EIO);
1318 1318
1319 1319 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1320 1320 error = physio(zvol_strategy, NULL, dev, B_READ,
1321 1321 zvol_minphys, uio);
1322 1322 return (error);
1323 1323 }
1324 1324
1325 1325 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1326 1326 RL_READER);
1327 1327 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1328 1328 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1329 1329
1330 1330 /* don't read past the end */
1331 1331 if (bytes > volsize - uio->uio_loffset)
1332 1332 bytes = volsize - uio->uio_loffset;
1333 1333
1334 1334 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes);
1335 1335 if (error) {
1336 1336 /* convert checksum errors into IO errors */
1337 1337 if (error == ECKSUM)
1338 1338 error = EIO;
1339 1339 break;
1340 1340 }
1341 1341 }
1342 1342 zfs_range_unlock(rl);
1343 1343 return (error);
1344 1344 }
1345 1345
1346 1346 /*ARGSUSED*/
1347 1347 int
1348 1348 zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
1349 1349 {
1350 1350 minor_t minor = getminor(dev);
1351 1351 zvol_state_t *zv;
1352 1352 uint64_t volsize;
1353 1353 rl_t *rl;
1354 1354 int error = 0;
1355 1355 boolean_t sync;
1356 1356
1357 1357 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1358 1358 if (zv == NULL)
1359 1359 return (ENXIO);
1360 1360
1361 1361 volsize = zv->zv_volsize;
1362 1362 if (uio->uio_resid > 0 &&
1363 1363 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
1364 1364 return (EIO);
1365 1365
1366 1366 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1367 1367 error = physio(zvol_strategy, NULL, dev, B_WRITE,
1368 1368 zvol_minphys, uio);
1369 1369 return (error);
1370 1370 }
1371 1371
1372 1372 sync = !(zv->zv_flags & ZVOL_WCE) ||
1373 1373 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
1374 1374
1375 1375 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1376 1376 RL_WRITER);
1377 1377 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1378 1378 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1379 1379 uint64_t off = uio->uio_loffset;
1380 1380 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1381 1381
1382 1382 if (bytes > volsize - off) /* don't write past the end */
1383 1383 bytes = volsize - off;
1384 1384
1385 1385 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
1386 1386 error = dmu_tx_assign(tx, TXG_WAIT);
1387 1387 if (error) {
1388 1388 dmu_tx_abort(tx);
1389 1389 break;
1390 1390 }
1391 1391 error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx);
1392 1392 if (error == 0)
1393 1393 zvol_log_write(zv, tx, off, bytes, sync);
1394 1394 dmu_tx_commit(tx);
1395 1395
1396 1396 if (error)
1397 1397 break;
1398 1398 }
1399 1399 zfs_range_unlock(rl);
1400 1400 if (sync)
1401 1401 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1402 1402 return (error);
1403 1403 }
1404 1404
1405 1405 int
1406 1406 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
1407 1407 {
1408 1408 struct uuid uuid = EFI_RESERVED;
1409 1409 efi_gpe_t gpe = { 0 };
1410 1410 uint32_t crc;
1411 1411 dk_efi_t efi;
1412 1412 int length;
1413 1413 char *ptr;
1414 1414
1415 1415 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
1416 1416 return (EFAULT);
1417 1417 ptr = (char *)(uintptr_t)efi.dki_data_64;
1418 1418 length = efi.dki_length;
1419 1419 /*
1420 1420 * Some clients may attempt to request a PMBR for the
1421 1421 * zvol. Currently this interface will return EINVAL to
1422 1422 * such requests. These requests could be supported by
1423 1423 * adding a check for lba == 0 and consing up an appropriate
1424 1424 * PMBR.
1425 1425 */
1426 1426 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
1427 1427 return (EINVAL);
1428 1428
1429 1429 gpe.efi_gpe_StartingLBA = LE_64(34ULL);
1430 1430 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
1431 1431 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
1432 1432
1433 1433 if (efi.dki_lba == 1) {
1434 1434 efi_gpt_t gpt = { 0 };
1435 1435
1436 1436 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
1437 1437 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
1438 1438 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
1439 1439 gpt.efi_gpt_MyLBA = LE_64(1ULL);
1440 1440 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
1441 1441 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
1442 1442 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
1443 1443 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
1444 1444 gpt.efi_gpt_SizeOfPartitionEntry =
1445 1445 LE_32(sizeof (efi_gpe_t));
1446 1446 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
1447 1447 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
1448 1448 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
1449 1449 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
1450 1450 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
1451 1451 flag))
1452 1452 return (EFAULT);
1453 1453 ptr += sizeof (gpt);
1454 1454 length -= sizeof (gpt);
1455 1455 }
1456 1456 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
1457 1457 length), flag))
1458 1458 return (EFAULT);
1459 1459 return (0);
1460 1460 }
1461 1461
1462 1462 /*
1463 1463 * BEGIN entry points to allow external callers access to the volume.
1464 1464 */
1465 1465 /*
1466 1466 * Return the volume parameters needed for access from an external caller.
1467 1467 * These values are invariant as long as the volume is held open.
1468 1468 */
1469 1469 int
1470 1470 zvol_get_volume_params(minor_t minor, uint64_t *blksize,
1471 1471 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl,
1472 1472 void **rl_hdl, void **bonus_hdl)
1473 1473 {
1474 1474 zvol_state_t *zv;
1475 1475
1476 1476 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1477 1477 if (zv == NULL)
1478 1478 return (ENXIO);
1479 1479 if (zv->zv_flags & ZVOL_DUMPIFIED)
1480 1480 return (ENXIO);
1481 1481
1482 1482 ASSERT(blksize && max_xfer_len && minor_hdl &&
1483 1483 objset_hdl && zil_hdl && rl_hdl && bonus_hdl);
1484 1484
1485 1485 *blksize = zv->zv_volblocksize;
1486 1486 *max_xfer_len = (uint64_t)zvol_maxphys;
1487 1487 *minor_hdl = zv;
1488 1488 *objset_hdl = zv->zv_objset;
1489 1489 *zil_hdl = zv->zv_zilog;
1490 1490 *rl_hdl = &zv->zv_znode;
1491 1491 *bonus_hdl = zv->zv_dbuf;
1492 1492 return (0);
1493 1493 }
1494 1494
1495 1495 /*
1496 1496 * Return the current volume size to an external caller.
1497 1497 * The size can change while the volume is open.
1498 1498 */
1499 1499 uint64_t
1500 1500 zvol_get_volume_size(void *minor_hdl)
1501 1501 {
1502 1502 zvol_state_t *zv = minor_hdl;
1503 1503
1504 1504 return (zv->zv_volsize);
1505 1505 }
1506 1506
1507 1507 /*
1508 1508 * Return the current WCE setting to an external caller.
1509 1509 * The WCE setting can change while the volume is open.
1510 1510 */
1511 1511 int
1512 1512 zvol_get_volume_wce(void *minor_hdl)
1513 1513 {
1514 1514 zvol_state_t *zv = minor_hdl;
1515 1515
1516 1516 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0);
1517 1517 }
1518 1518
1519 1519 /*
1520 1520 * Entry point for external callers to zvol_log_write
1521 1521 */
1522 1522 void
1523 1523 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid,
1524 1524 boolean_t sync)
1525 1525 {
1526 1526 zvol_state_t *zv = minor_hdl;
1527 1527
1528 1528 zvol_log_write(zv, tx, off, resid, sync);
1529 1529 }
1530 1530 /*
1531 1531 * END entry points to allow external callers access to the volume.
1532 1532 */
1533 1533
1534 1534 /*
1535 1535 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE.
1536 1536 */
1537 1537 static void
1538 1538 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len,
1539 1539 boolean_t sync)
1540 1540 {
1541 1541 itx_t *itx;
1542 1542 lr_truncate_t *lr;
1543 1543 zilog_t *zilog = zv->zv_zilog;
1544 1544
1545 1545 if (zil_replaying(zilog, tx))
1546 1546 return;
1547 1547
1548 1548 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr));
1549 1549 lr = (lr_truncate_t *)&itx->itx_lr;
1550 1550 lr->lr_foid = ZVOL_OBJ;
1551 1551 lr->lr_offset = off;
1552 1552 lr->lr_length = len;
1553 1553
1554 1554 itx->itx_sync = sync;
1555 1555 zil_itx_assign(zilog, itx, tx);
1556 1556 }
1557 1557
1558 1558 /*
1559 1559 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I).
1560 1560 * Also a dirtbag dkio ioctl for unmap/free-block functionality.
1561 1561 */
1562 1562 /*ARGSUSED*/
1563 1563 int
1564 1564 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
1565 1565 {
1566 1566 zvol_state_t *zv;
1567 1567 struct dk_cinfo dki;
1568 1568 struct dk_minfo dkm;
1569 1569 struct dk_callback *dkc;
1570 1570 int error = 0;
1571 1571 rl_t *rl;
1572 1572
1573 1573 mutex_enter(&zfsdev_state_lock);
1574 1574
1575 1575 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL);
1576 1576
1577 1577 if (zv == NULL) {
1578 1578 mutex_exit(&zfsdev_state_lock);
1579 1579 return (ENXIO);
1580 1580 }
1581 1581 ASSERT(zv->zv_total_opens > 0);
1582 1582
1583 1583 switch (cmd) {
1584 1584
1585 1585 case DKIOCINFO:
1586 1586 bzero(&dki, sizeof (dki));
1587 1587 (void) strcpy(dki.dki_cname, "zvol");
1588 1588 (void) strcpy(dki.dki_dname, "zvol");
1589 1589 dki.dki_ctype = DKC_UNKNOWN;
1590 1590 dki.dki_unit = getminor(dev);
1591 1591 dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs);
1592 1592 mutex_exit(&zfsdev_state_lock);
1593 1593 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
1594 1594 error = EFAULT;
1595 1595 return (error);
1596 1596
1597 1597 case DKIOCGMEDIAINFO:
1598 1598 bzero(&dkm, sizeof (dkm));
1599 1599 dkm.dki_lbsize = 1U << zv->zv_min_bs;
1600 1600 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
1601 1601 dkm.dki_media_type = DK_UNKNOWN;
1602 1602 mutex_exit(&zfsdev_state_lock);
1603 1603 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
1604 1604 error = EFAULT;
1605 1605 return (error);
1606 1606
1607 1607 case DKIOCGETEFI:
1608 1608 {
1609 1609 uint64_t vs = zv->zv_volsize;
1610 1610 uint8_t bs = zv->zv_min_bs;
1611 1611
1612 1612 mutex_exit(&zfsdev_state_lock);
1613 1613 error = zvol_getefi((void *)arg, flag, vs, bs);
1614 1614 return (error);
1615 1615 }
1616 1616
1617 1617 case DKIOCFLUSHWRITECACHE:
1618 1618 dkc = (struct dk_callback *)arg;
1619 1619 mutex_exit(&zfsdev_state_lock);
1620 1620 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1621 1621 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
1622 1622 (*dkc->dkc_callback)(dkc->dkc_cookie, error);
1623 1623 error = 0;
1624 1624 }
1625 1625 return (error);
1626 1626
1627 1627 case DKIOCGETWCE:
1628 1628 {
1629 1629 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0;
1630 1630 if (ddi_copyout(&wce, (void *)arg, sizeof (int),
1631 1631 flag))
1632 1632 error = EFAULT;
1633 1633 break;
1634 1634 }
1635 1635 case DKIOCSETWCE:
1636 1636 {
1637 1637 int wce;
1638 1638 if (ddi_copyin((void *)arg, &wce, sizeof (int),
1639 1639 flag)) {
1640 1640 error = EFAULT;
1641 1641 break;
1642 1642 }
1643 1643 if (wce) {
1644 1644 zv->zv_flags |= ZVOL_WCE;
1645 1645 mutex_exit(&zfsdev_state_lock);
1646 1646 } else {
1647 1647 zv->zv_flags &= ~ZVOL_WCE;
1648 1648 mutex_exit(&zfsdev_state_lock);
1649 1649 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1650 1650 }
1651 1651 return (0);
1652 1652 }
1653 1653
1654 1654 case DKIOCGGEOM:
1655 1655 case DKIOCGVTOC:
1656 1656 /*
1657 1657 * commands using these (like prtvtoc) expect ENOTSUP
1658 1658 * since we're emulating an EFI label
1659 1659 */
1660 1660 error = ENOTSUP;
1661 1661 break;
1662 1662
1663 1663 case DKIOCDUMPINIT:
1664 1664 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1665 1665 RL_WRITER);
1666 1666 error = zvol_dumpify(zv);
1667 1667 zfs_range_unlock(rl);
1668 1668 break;
1669 1669
1670 1670 case DKIOCDUMPFINI:
1671 1671 if (!(zv->zv_flags & ZVOL_DUMPIFIED))
1672 1672 break;
1673 1673 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1674 1674 RL_WRITER);
1675 1675 error = zvol_dump_fini(zv);
1676 1676 zfs_range_unlock(rl);
1677 1677 break;
1678 1678
1679 1679 case DKIOCFREE:
1680 1680 {
1681 1681 dkioc_free_t df;
1682 1682 dmu_tx_t *tx;
1683 1683
1684 1684 if (ddi_copyin((void *)arg, &df, sizeof (df), flag)) {
1685 1685 error = EFAULT;
1686 1686 break;
1687 1687 }
1688 1688
1689 1689 /*
1690 1690 * Apply Postel's Law to length-checking. If they overshoot,
1691 1691 * just blank out until the end, if there's a need to blank
1692 1692 * out anything.
1693 1693 */
1694 1694 if (df.df_start >= zv->zv_volsize)
1695 1695 break; /* No need to do anything... */
1696 1696 if (df.df_start + df.df_length > zv->zv_volsize)
1697 1697 df.df_length = DMU_OBJECT_END;
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1698 1698
1699 1699 rl = zfs_range_lock(&zv->zv_znode, df.df_start, df.df_length,
1700 1700 RL_WRITER);
1701 1701 tx = dmu_tx_create(zv->zv_objset);
1702 1702 error = dmu_tx_assign(tx, TXG_WAIT);
1703 1703 if (error != 0) {
1704 1704 dmu_tx_abort(tx);
1705 1705 } else {
1706 1706 zvol_log_truncate(zv, tx, df.df_start,
1707 1707 df.df_length, B_TRUE);
1708 + dmu_tx_commit(tx);
1708 1709 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
1709 1710 df.df_start, df.df_length);
1710 - dmu_tx_commit(tx);
1711 1711 }
1712 1712
1713 1713 zfs_range_unlock(rl);
1714 1714
1715 1715 if (error == 0) {
1716 1716 /*
1717 1717 * If the write-cache is disabled or 'sync' property
1718 1718 * is set to 'always' then treat this as a synchronous
1719 1719 * operation (i.e. commit to zil).
1720 1720 */
1721 1721 if (!(zv->zv_flags & ZVOL_WCE) ||
1722 1722 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS))
1723 1723 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1724 1724
1725 1725 /*
1726 1726 * If the caller really wants synchronous writes, and
1727 1727 * can't wait for them, don't return until the write
1728 1728 * is done.
1729 1729 */
1730 1730 if (df.df_flags & DF_WAIT_SYNC) {
1731 1731 txg_wait_synced(
1732 1732 dmu_objset_pool(zv->zv_objset), 0);
1733 1733 }
1734 1734 }
1735 1735 break;
1736 1736 }
1737 1737
1738 1738 default:
1739 1739 error = ENOTTY;
1740 1740 break;
1741 1741
1742 1742 }
1743 1743 mutex_exit(&zfsdev_state_lock);
1744 1744 return (error);
1745 1745 }
1746 1746
1747 1747 int
1748 1748 zvol_busy(void)
1749 1749 {
1750 1750 return (zvol_minors != 0);
1751 1751 }
1752 1752
1753 1753 void
1754 1754 zvol_init(void)
1755 1755 {
1756 1756 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t),
1757 1757 1) == 0);
1758 1758 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL);
1759 1759 }
1760 1760
1761 1761 void
1762 1762 zvol_fini(void)
1763 1763 {
1764 1764 mutex_destroy(&zfsdev_state_lock);
1765 1765 ddi_soft_state_fini(&zfsdev_state);
1766 1766 }
1767 1767
1768 1768 static int
1769 1769 zvol_dump_init(zvol_state_t *zv, boolean_t resize)
1770 1770 {
1771 1771 dmu_tx_t *tx;
1772 1772 int error = 0;
1773 1773 objset_t *os = zv->zv_objset;
1774 1774 nvlist_t *nv = NULL;
1775 1775 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
1776 1776
1777 1777 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
1778 1778 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0,
1779 1779 DMU_OBJECT_END);
1780 1780 /* wait for dmu_free_long_range to actually free the blocks */
1781 1781 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
1782 1782
1783 1783 tx = dmu_tx_create(os);
1784 1784 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1785 1785 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
1786 1786 error = dmu_tx_assign(tx, TXG_WAIT);
1787 1787 if (error) {
1788 1788 dmu_tx_abort(tx);
1789 1789 return (error);
1790 1790 }
1791 1791
1792 1792 /*
1793 1793 * If we are resizing the dump device then we only need to
1794 1794 * update the refreservation to match the newly updated
1795 1795 * zvolsize. Otherwise, we save off the original state of the
1796 1796 * zvol so that we can restore them if the zvol is ever undumpified.
1797 1797 */
1798 1798 if (resize) {
1799 1799 error = zap_update(os, ZVOL_ZAP_OBJ,
1800 1800 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
1801 1801 &zv->zv_volsize, tx);
1802 1802 } else {
1803 1803 uint64_t checksum, compress, refresrv, vbs, dedup;
1804 1804
1805 1805 error = dsl_prop_get_integer(zv->zv_name,
1806 1806 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
1807 1807 error = error ? error : dsl_prop_get_integer(zv->zv_name,
1808 1808 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL);
1809 1809 error = error ? error : dsl_prop_get_integer(zv->zv_name,
1810 1810 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL);
1811 1811 error = error ? error : dsl_prop_get_integer(zv->zv_name,
1812 1812 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL);
1813 1813 if (version >= SPA_VERSION_DEDUP) {
1814 1814 error = error ? error :
1815 1815 dsl_prop_get_integer(zv->zv_name,
1816 1816 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL);
1817 1817 }
1818 1818
1819 1819 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1820 1820 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
1821 1821 &compress, tx);
1822 1822 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1823 1823 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx);
1824 1824 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1825 1825 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
1826 1826 &refresrv, tx);
1827 1827 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1828 1828 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
1829 1829 &vbs, tx);
1830 1830 error = error ? error : dmu_object_set_blocksize(
1831 1831 os, ZVOL_OBJ, SPA_MAXBLOCKSIZE, 0, tx);
1832 1832 if (version >= SPA_VERSION_DEDUP) {
1833 1833 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1834 1834 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1,
1835 1835 &dedup, tx);
1836 1836 }
1837 1837 if (error == 0)
1838 1838 zv->zv_volblocksize = SPA_MAXBLOCKSIZE;
1839 1839 }
1840 1840 dmu_tx_commit(tx);
1841 1841
1842 1842 /*
1843 1843 * We only need update the zvol's property if we are initializing
1844 1844 * the dump area for the first time.
1845 1845 */
1846 1846 if (!resize) {
1847 1847 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1848 1848 VERIFY(nvlist_add_uint64(nv,
1849 1849 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
1850 1850 VERIFY(nvlist_add_uint64(nv,
1851 1851 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
1852 1852 ZIO_COMPRESS_OFF) == 0);
1853 1853 VERIFY(nvlist_add_uint64(nv,
1854 1854 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
1855 1855 ZIO_CHECKSUM_OFF) == 0);
1856 1856 if (version >= SPA_VERSION_DEDUP) {
1857 1857 VERIFY(nvlist_add_uint64(nv,
1858 1858 zfs_prop_to_name(ZFS_PROP_DEDUP),
1859 1859 ZIO_CHECKSUM_OFF) == 0);
1860 1860 }
1861 1861
1862 1862 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
1863 1863 nv, NULL);
1864 1864 nvlist_free(nv);
1865 1865
1866 1866 if (error)
1867 1867 return (error);
1868 1868 }
1869 1869
1870 1870 /* Allocate the space for the dump */
1871 1871 error = zvol_prealloc(zv);
1872 1872 return (error);
1873 1873 }
1874 1874
1875 1875 static int
1876 1876 zvol_dumpify(zvol_state_t *zv)
1877 1877 {
1878 1878 int error = 0;
1879 1879 uint64_t dumpsize = 0;
1880 1880 dmu_tx_t *tx;
1881 1881 objset_t *os = zv->zv_objset;
1882 1882
1883 1883 if (zv->zv_flags & ZVOL_RDONLY)
1884 1884 return (EROFS);
1885 1885
1886 1886 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
1887 1887 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
1888 1888 boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE;
1889 1889
1890 1890 if ((error = zvol_dump_init(zv, resize)) != 0) {
1891 1891 (void) zvol_dump_fini(zv);
1892 1892 return (error);
1893 1893 }
1894 1894 }
1895 1895
1896 1896 /*
1897 1897 * Build up our lba mapping.
1898 1898 */
1899 1899 error = zvol_get_lbas(zv);
1900 1900 if (error) {
1901 1901 (void) zvol_dump_fini(zv);
1902 1902 return (error);
1903 1903 }
1904 1904
1905 1905 tx = dmu_tx_create(os);
1906 1906 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1907 1907 error = dmu_tx_assign(tx, TXG_WAIT);
1908 1908 if (error) {
1909 1909 dmu_tx_abort(tx);
1910 1910 (void) zvol_dump_fini(zv);
1911 1911 return (error);
1912 1912 }
1913 1913
1914 1914 zv->zv_flags |= ZVOL_DUMPIFIED;
1915 1915 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
1916 1916 &zv->zv_volsize, tx);
1917 1917 dmu_tx_commit(tx);
1918 1918
1919 1919 if (error) {
1920 1920 (void) zvol_dump_fini(zv);
1921 1921 return (error);
1922 1922 }
1923 1923
1924 1924 txg_wait_synced(dmu_objset_pool(os), 0);
1925 1925 return (0);
1926 1926 }
1927 1927
1928 1928 static int
1929 1929 zvol_dump_fini(zvol_state_t *zv)
1930 1930 {
1931 1931 dmu_tx_t *tx;
1932 1932 objset_t *os = zv->zv_objset;
1933 1933 nvlist_t *nv;
1934 1934 int error = 0;
1935 1935 uint64_t checksum, compress, refresrv, vbs, dedup;
1936 1936 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
1937 1937
1938 1938 /*
1939 1939 * Attempt to restore the zvol back to its pre-dumpified state.
1940 1940 * This is a best-effort attempt as it's possible that not all
1941 1941 * of these properties were initialized during the dumpify process
1942 1942 * (i.e. error during zvol_dump_init).
1943 1943 */
1944 1944
1945 1945 tx = dmu_tx_create(os);
1946 1946 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1947 1947 error = dmu_tx_assign(tx, TXG_WAIT);
1948 1948 if (error) {
1949 1949 dmu_tx_abort(tx);
1950 1950 return (error);
1951 1951 }
1952 1952 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
1953 1953 dmu_tx_commit(tx);
1954 1954
1955 1955 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1956 1956 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
1957 1957 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1958 1958 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
1959 1959 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1960 1960 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
1961 1961 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1962 1962 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
1963 1963
1964 1964 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1965 1965 (void) nvlist_add_uint64(nv,
1966 1966 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
1967 1967 (void) nvlist_add_uint64(nv,
1968 1968 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
1969 1969 (void) nvlist_add_uint64(nv,
1970 1970 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
1971 1971 if (version >= SPA_VERSION_DEDUP &&
1972 1972 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1973 1973 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) {
1974 1974 (void) nvlist_add_uint64(nv,
1975 1975 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup);
1976 1976 }
1977 1977 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
1978 1978 nv, NULL);
1979 1979 nvlist_free(nv);
1980 1980
1981 1981 zvol_free_extents(zv);
1982 1982 zv->zv_flags &= ~ZVOL_DUMPIFIED;
1983 1983 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);
1984 1984 /* wait for dmu_free_long_range to actually free the blocks */
1985 1985 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
1986 1986 tx = dmu_tx_create(os);
1987 1987 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
1988 1988 error = dmu_tx_assign(tx, TXG_WAIT);
1989 1989 if (error) {
1990 1990 dmu_tx_abort(tx);
1991 1991 return (error);
1992 1992 }
1993 1993 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0)
1994 1994 zv->zv_volblocksize = vbs;
1995 1995 dmu_tx_commit(tx);
1996 1996
1997 1997 return (0);
1998 1998 }
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