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60101509 BB |
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) 2008-2010 Lawrence Livermore National Security, LLC. | |
23 | * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). | |
24 | * Rewritten for Linux by Brian Behlendorf <behlendorf1@llnl.gov>. | |
25 | * LLNL-CODE-403049. | |
26 | * | |
27 | * ZFS volume emulation driver. | |
28 | * | |
29 | * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. | |
30 | * Volumes are accessed through the symbolic links named: | |
31 | * | |
32 | * /dev/<pool_name>/<dataset_name> | |
33 | * | |
34 | * Volumes are persistent through reboot and module load. No user command | |
35 | * needs to be run before opening and using a device. | |
460a0213 DM |
36 | * |
37 | * Copyright 2014 Nexenta Systems, Inc. All rights reserved. | |
5428dc51 | 38 | * Copyright (c) 2016 Actifio, Inc. All rights reserved. |
60101509 BB |
39 | */ |
40 | ||
03c6040b | 41 | #include <sys/dbuf.h> |
60101509 BB |
42 | #include <sys/dmu_traverse.h> |
43 | #include <sys/dsl_dataset.h> | |
44 | #include <sys/dsl_prop.h> | |
a0bd735a | 45 | #include <sys/dsl_dir.h> |
60101509 | 46 | #include <sys/zap.h> |
4cb7b9c5 | 47 | #include <sys/zfeature.h> |
60101509 | 48 | #include <sys/zil_impl.h> |
460a0213 | 49 | #include <sys/dmu_tx.h> |
60101509 BB |
50 | #include <sys/zio.h> |
51 | #include <sys/zfs_rlock.h> | |
52 | #include <sys/zfs_znode.h> | |
a0bd735a | 53 | #include <sys/spa_impl.h> |
60101509 | 54 | #include <sys/zvol.h> |
61e90960 | 55 | #include <linux/blkdev_compat.h> |
60101509 | 56 | |
74497b7a | 57 | unsigned int zvol_inhibit_dev = 0; |
60101509 | 58 | unsigned int zvol_major = ZVOL_MAJOR; |
9965059a | 59 | unsigned int zvol_prefetch_bytes = (128 * 1024); |
7c0e5708 | 60 | unsigned long zvol_max_discard_blocks = 16384; |
60101509 | 61 | |
60101509 BB |
62 | static kmutex_t zvol_state_lock; |
63 | static list_t zvol_state_list; | |
60101509 | 64 | |
d45e010d CC |
65 | #define ZVOL_HT_SIZE 1024 |
66 | static struct hlist_head *zvol_htable; | |
67 | #define ZVOL_HT_HEAD(hash) (&zvol_htable[(hash) & (ZVOL_HT_SIZE-1)]) | |
4a5d7f82 MA |
68 | |
69 | static struct ida zvol_ida; | |
d45e010d | 70 | |
60101509 BB |
71 | /* |
72 | * The in-core state of each volume. | |
73 | */ | |
040dab99 | 74 | struct zvol_state { |
4c0d8e50 | 75 | char zv_name[MAXNAMELEN]; /* name */ |
ce37ebd2 BB |
76 | uint64_t zv_volsize; /* advertised space */ |
77 | uint64_t zv_volblocksize; /* volume block size */ | |
60101509 BB |
78 | objset_t *zv_objset; /* objset handle */ |
79 | uint32_t zv_flags; /* ZVOL_* flags */ | |
80 | uint32_t zv_open_count; /* open counts */ | |
81 | uint32_t zv_changed; /* disk changed */ | |
82 | zilog_t *zv_zilog; /* ZIL handle */ | |
d88895a0 | 83 | zfs_rlock_t zv_range_lock; /* range lock */ |
60101509 BB |
84 | dmu_buf_t *zv_dbuf; /* bonus handle */ |
85 | dev_t zv_dev; /* device id */ | |
86 | struct gendisk *zv_disk; /* generic disk */ | |
87 | struct request_queue *zv_queue; /* request queue */ | |
60101509 | 88 | list_node_t zv_next; /* next zvol_state_t linkage */ |
d45e010d CC |
89 | uint64_t zv_hash; /* name hash */ |
90 | struct hlist_node zv_hlink; /* hash link */ | |
040dab99 CC |
91 | atomic_t zv_suspend_ref; /* refcount for suspend */ |
92 | krwlock_t zv_suspend_lock; /* suspend lock */ | |
93 | }; | |
60101509 | 94 | |
a0bd735a BP |
95 | typedef enum { |
96 | ZVOL_ASYNC_CREATE_MINORS, | |
97 | ZVOL_ASYNC_REMOVE_MINORS, | |
98 | ZVOL_ASYNC_RENAME_MINORS, | |
99 | ZVOL_ASYNC_SET_SNAPDEV, | |
100 | ZVOL_ASYNC_MAX | |
101 | } zvol_async_op_t; | |
102 | ||
103 | typedef struct { | |
104 | zvol_async_op_t op; | |
105 | char pool[MAXNAMELEN]; | |
106 | char name1[MAXNAMELEN]; | |
107 | char name2[MAXNAMELEN]; | |
108 | zprop_source_t source; | |
109 | uint64_t snapdev; | |
110 | } zvol_task_t; | |
111 | ||
60101509 BB |
112 | #define ZVOL_RDONLY 0x1 |
113 | ||
d45e010d CC |
114 | static uint64_t |
115 | zvol_name_hash(const char *name) | |
60101509 | 116 | { |
d45e010d CC |
117 | int i; |
118 | uint64_t crc = -1ULL; | |
119 | uint8_t *p = (uint8_t *)name; | |
120 | ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); | |
121 | for (i = 0; i < MAXNAMELEN - 1 && *p; i++, p++) { | |
122 | crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (*p)) & 0xFF]; | |
60101509 | 123 | } |
d45e010d | 124 | return (crc); |
60101509 BB |
125 | } |
126 | ||
127 | /* | |
128 | * Find a zvol_state_t given the full major+minor dev_t. | |
129 | */ | |
130 | static zvol_state_t * | |
131 | zvol_find_by_dev(dev_t dev) | |
132 | { | |
133 | zvol_state_t *zv; | |
134 | ||
135 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
136 | for (zv = list_head(&zvol_state_list); zv != NULL; | |
ce37ebd2 | 137 | zv = list_next(&zvol_state_list, zv)) { |
60101509 | 138 | if (zv->zv_dev == dev) |
ce37ebd2 | 139 | return (zv); |
60101509 BB |
140 | } |
141 | ||
ce37ebd2 | 142 | return (NULL); |
60101509 BB |
143 | } |
144 | ||
145 | /* | |
d45e010d | 146 | * Find a zvol_state_t given the name and hash generated by zvol_name_hash. |
60101509 BB |
147 | */ |
148 | static zvol_state_t * | |
d45e010d | 149 | zvol_find_by_name_hash(const char *name, uint64_t hash) |
60101509 BB |
150 | { |
151 | zvol_state_t *zv; | |
d45e010d | 152 | struct hlist_node *p; |
60101509 BB |
153 | |
154 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
d45e010d CC |
155 | hlist_for_each(p, ZVOL_HT_HEAD(hash)) { |
156 | zv = hlist_entry(p, zvol_state_t, zv_hlink); | |
157 | if (zv->zv_hash == hash && | |
158 | strncmp(zv->zv_name, name, MAXNAMELEN) == 0) | |
ce37ebd2 | 159 | return (zv); |
60101509 | 160 | } |
ce37ebd2 | 161 | return (NULL); |
60101509 BB |
162 | } |
163 | ||
d45e010d CC |
164 | /* |
165 | * Find a zvol_state_t given the name provided at zvol_alloc() time. | |
166 | */ | |
167 | static zvol_state_t * | |
168 | zvol_find_by_name(const char *name) | |
169 | { | |
170 | return (zvol_find_by_name_hash(name, zvol_name_hash(name))); | |
171 | } | |
172 | ||
6c285672 JL |
173 | |
174 | /* | |
175 | * Given a path, return TRUE if path is a ZVOL. | |
176 | */ | |
177 | boolean_t | |
178 | zvol_is_zvol(const char *device) | |
179 | { | |
180 | struct block_device *bdev; | |
181 | unsigned int major; | |
182 | ||
e02aaf17 | 183 | bdev = vdev_lookup_bdev(device); |
6c285672 JL |
184 | if (IS_ERR(bdev)) |
185 | return (B_FALSE); | |
186 | ||
187 | major = MAJOR(bdev->bd_dev); | |
188 | bdput(bdev); | |
189 | ||
190 | if (major == zvol_major) | |
ce37ebd2 | 191 | return (B_TRUE); |
6c285672 JL |
192 | |
193 | return (B_FALSE); | |
194 | } | |
195 | ||
60101509 BB |
196 | /* |
197 | * ZFS_IOC_CREATE callback handles dmu zvol and zap object creation. | |
198 | */ | |
199 | void | |
200 | zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) | |
201 | { | |
202 | zfs_creat_t *zct = arg; | |
203 | nvlist_t *nvprops = zct->zct_props; | |
204 | int error; | |
205 | uint64_t volblocksize, volsize; | |
206 | ||
207 | VERIFY(nvlist_lookup_uint64(nvprops, | |
208 | zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); | |
209 | if (nvlist_lookup_uint64(nvprops, | |
210 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) | |
211 | volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); | |
212 | ||
213 | /* | |
214 | * These properties must be removed from the list so the generic | |
215 | * property setting step won't apply to them. | |
216 | */ | |
217 | VERIFY(nvlist_remove_all(nvprops, | |
218 | zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); | |
219 | (void) nvlist_remove_all(nvprops, | |
220 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); | |
221 | ||
222 | error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, | |
223 | DMU_OT_NONE, 0, tx); | |
224 | ASSERT(error == 0); | |
225 | ||
226 | error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, | |
227 | DMU_OT_NONE, 0, tx); | |
228 | ASSERT(error == 0); | |
229 | ||
230 | error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); | |
231 | ASSERT(error == 0); | |
232 | } | |
233 | ||
234 | /* | |
235 | * ZFS_IOC_OBJSET_STATS entry point. | |
236 | */ | |
237 | int | |
238 | zvol_get_stats(objset_t *os, nvlist_t *nv) | |
239 | { | |
240 | int error; | |
241 | dmu_object_info_t *doi; | |
242 | uint64_t val; | |
243 | ||
244 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); | |
245 | if (error) | |
ce37ebd2 | 246 | return (SET_ERROR(error)); |
60101509 BB |
247 | |
248 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); | |
ce37ebd2 | 249 | doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP); |
60101509 BB |
250 | error = dmu_object_info(os, ZVOL_OBJ, doi); |
251 | ||
252 | if (error == 0) { | |
253 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, | |
254 | doi->doi_data_block_size); | |
255 | } | |
256 | ||
ce37ebd2 | 257 | kmem_free(doi, sizeof (dmu_object_info_t)); |
60101509 | 258 | |
ce37ebd2 | 259 | return (SET_ERROR(error)); |
60101509 BB |
260 | } |
261 | ||
35d3e322 BB |
262 | static void |
263 | zvol_size_changed(zvol_state_t *zv, uint64_t volsize) | |
264 | { | |
265 | struct block_device *bdev; | |
266 | ||
267 | bdev = bdget_disk(zv->zv_disk, 0); | |
268 | if (bdev == NULL) | |
269 | return; | |
35d3e322 BB |
270 | set_capacity(zv->zv_disk, volsize >> 9); |
271 | zv->zv_volsize = volsize; | |
272 | check_disk_size_change(zv->zv_disk, bdev); | |
35d3e322 BB |
273 | |
274 | bdput(bdev); | |
275 | } | |
276 | ||
60101509 BB |
277 | /* |
278 | * Sanity check volume size. | |
279 | */ | |
280 | int | |
281 | zvol_check_volsize(uint64_t volsize, uint64_t blocksize) | |
282 | { | |
283 | if (volsize == 0) | |
2e528b49 | 284 | return (SET_ERROR(EINVAL)); |
60101509 BB |
285 | |
286 | if (volsize % blocksize != 0) | |
2e528b49 | 287 | return (SET_ERROR(EINVAL)); |
60101509 BB |
288 | |
289 | #ifdef _ILP32 | |
82ec9d41 | 290 | if (volsize - 1 > SPEC_MAXOFFSET_T) |
2e528b49 | 291 | return (SET_ERROR(EOVERFLOW)); |
60101509 BB |
292 | #endif |
293 | return (0); | |
294 | } | |
295 | ||
296 | /* | |
297 | * Ensure the zap is flushed then inform the VFS of the capacity change. | |
298 | */ | |
299 | static int | |
35d3e322 | 300 | zvol_update_volsize(uint64_t volsize, objset_t *os) |
60101509 | 301 | { |
60101509 BB |
302 | dmu_tx_t *tx; |
303 | int error; | |
513168ab | 304 | uint64_t txg; |
60101509 BB |
305 | |
306 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
307 | ||
df554c14 | 308 | tx = dmu_tx_create(os); |
60101509 | 309 | dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); |
19d55079 | 310 | dmu_tx_mark_netfree(tx); |
60101509 BB |
311 | error = dmu_tx_assign(tx, TXG_WAIT); |
312 | if (error) { | |
313 | dmu_tx_abort(tx); | |
ce37ebd2 | 314 | return (SET_ERROR(error)); |
60101509 | 315 | } |
513168ab | 316 | txg = dmu_tx_get_txg(tx); |
60101509 | 317 | |
df554c14 | 318 | error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, |
60101509 BB |
319 | &volsize, tx); |
320 | dmu_tx_commit(tx); | |
321 | ||
513168ab | 322 | txg_wait_synced(dmu_objset_pool(os), txg); |
323 | ||
35d3e322 BB |
324 | if (error == 0) |
325 | error = dmu_free_long_range(os, | |
326 | ZVOL_OBJ, volsize, DMU_OBJECT_END); | |
60101509 | 327 | |
35d3e322 BB |
328 | return (error); |
329 | } | |
60101509 | 330 | |
35d3e322 BB |
331 | static int |
332 | zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize) | |
333 | { | |
334 | zvol_size_changed(zv, volsize); | |
60101509 | 335 | |
35d3e322 BB |
336 | /* |
337 | * We should post a event here describing the expansion. However, | |
338 | * the zfs_ereport_post() interface doesn't nicely support posting | |
339 | * events for zvols, it assumes events relate to vdevs or zios. | |
340 | */ | |
60101509 BB |
341 | |
342 | return (0); | |
343 | } | |
344 | ||
345 | /* | |
346 | * Set ZFS_PROP_VOLSIZE set entry point. | |
347 | */ | |
348 | int | |
349 | zvol_set_volsize(const char *name, uint64_t volsize) | |
350 | { | |
35d3e322 | 351 | zvol_state_t *zv = NULL; |
60101509 | 352 | objset_t *os = NULL; |
60101509 | 353 | int error; |
35d3e322 BB |
354 | dmu_object_info_t *doi; |
355 | uint64_t readonly; | |
356 | boolean_t owned = B_FALSE; | |
60101509 | 357 | |
13fe0198 MA |
358 | error = dsl_prop_get_integer(name, |
359 | zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); | |
360 | if (error != 0) | |
ce37ebd2 | 361 | return (SET_ERROR(error)); |
13fe0198 | 362 | if (readonly) |
2e528b49 | 363 | return (SET_ERROR(EROFS)); |
13fe0198 | 364 | |
60101509 | 365 | mutex_enter(&zvol_state_lock); |
60101509 | 366 | zv = zvol_find_by_name(name); |
35d3e322 BB |
367 | |
368 | if (zv == NULL || zv->zv_objset == NULL) { | |
369 | if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, | |
370 | FTAG, &os)) != 0) { | |
371 | mutex_exit(&zvol_state_lock); | |
372 | return (SET_ERROR(error)); | |
373 | } | |
374 | owned = B_TRUE; | |
375 | if (zv != NULL) | |
376 | zv->zv_objset = os; | |
377 | } else { | |
040dab99 | 378 | rw_enter(&zv->zv_suspend_lock, RW_READER); |
35d3e322 | 379 | os = zv->zv_objset; |
60101509 BB |
380 | } |
381 | ||
ce37ebd2 | 382 | doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP); |
60101509 | 383 | |
ce37ebd2 BB |
384 | if ((error = dmu_object_info(os, ZVOL_OBJ, doi)) || |
385 | (error = zvol_check_volsize(volsize, doi->doi_data_block_size))) | |
35d3e322 | 386 | goto out; |
60101509 | 387 | |
35d3e322 | 388 | error = zvol_update_volsize(volsize, os); |
ce37ebd2 | 389 | kmem_free(doi, sizeof (dmu_object_info_t)); |
60101509 | 390 | |
35d3e322 BB |
391 | if (error == 0 && zv != NULL) |
392 | error = zvol_update_live_volsize(zv, volsize); | |
393 | out: | |
394 | if (owned) { | |
395 | dmu_objset_disown(os, FTAG); | |
396 | if (zv != NULL) | |
397 | zv->zv_objset = NULL; | |
040dab99 CC |
398 | } else { |
399 | rw_exit(&zv->zv_suspend_lock); | |
35d3e322 | 400 | } |
60101509 | 401 | mutex_exit(&zvol_state_lock); |
35d3e322 | 402 | return (error); |
60101509 BB |
403 | } |
404 | ||
405 | /* | |
406 | * Sanity check volume block size. | |
407 | */ | |
408 | int | |
4cb7b9c5 | 409 | zvol_check_volblocksize(const char *name, uint64_t volblocksize) |
60101509 | 410 | { |
4cb7b9c5 BB |
411 | /* Record sizes above 128k need the feature to be enabled */ |
412 | if (volblocksize > SPA_OLD_MAXBLOCKSIZE) { | |
413 | spa_t *spa; | |
414 | int error; | |
415 | ||
416 | if ((error = spa_open(name, &spa, FTAG)) != 0) | |
417 | return (error); | |
418 | ||
419 | if (!spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { | |
420 | spa_close(spa, FTAG); | |
421 | return (SET_ERROR(ENOTSUP)); | |
422 | } | |
423 | ||
424 | /* | |
425 | * We don't allow setting the property above 1MB, | |
426 | * unless the tunable has been changed. | |
427 | */ | |
428 | if (volblocksize > zfs_max_recordsize) | |
429 | return (SET_ERROR(EDOM)); | |
430 | ||
431 | spa_close(spa, FTAG); | |
432 | } | |
433 | ||
60101509 BB |
434 | if (volblocksize < SPA_MINBLOCKSIZE || |
435 | volblocksize > SPA_MAXBLOCKSIZE || | |
436 | !ISP2(volblocksize)) | |
2e528b49 | 437 | return (SET_ERROR(EDOM)); |
60101509 BB |
438 | |
439 | return (0); | |
440 | } | |
441 | ||
442 | /* | |
443 | * Set ZFS_PROP_VOLBLOCKSIZE set entry point. | |
444 | */ | |
445 | int | |
446 | zvol_set_volblocksize(const char *name, uint64_t volblocksize) | |
447 | { | |
448 | zvol_state_t *zv; | |
449 | dmu_tx_t *tx; | |
450 | int error; | |
451 | ||
452 | mutex_enter(&zvol_state_lock); | |
453 | ||
454 | zv = zvol_find_by_name(name); | |
455 | if (zv == NULL) { | |
2e528b49 | 456 | error = SET_ERROR(ENXIO); |
60101509 BB |
457 | goto out; |
458 | } | |
459 | ||
ba6a2402 | 460 | if (zv->zv_flags & ZVOL_RDONLY) { |
2e528b49 | 461 | error = SET_ERROR(EROFS); |
60101509 BB |
462 | goto out; |
463 | } | |
464 | ||
040dab99 CC |
465 | rw_enter(&zv->zv_suspend_lock, RW_READER); |
466 | ||
60101509 BB |
467 | tx = dmu_tx_create(zv->zv_objset); |
468 | dmu_tx_hold_bonus(tx, ZVOL_OBJ); | |
469 | error = dmu_tx_assign(tx, TXG_WAIT); | |
470 | if (error) { | |
471 | dmu_tx_abort(tx); | |
472 | } else { | |
473 | error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, | |
474 | volblocksize, 0, tx); | |
475 | if (error == ENOTSUP) | |
2e528b49 | 476 | error = SET_ERROR(EBUSY); |
60101509 BB |
477 | dmu_tx_commit(tx); |
478 | if (error == 0) | |
479 | zv->zv_volblocksize = volblocksize; | |
480 | } | |
040dab99 | 481 | rw_exit(&zv->zv_suspend_lock); |
60101509 BB |
482 | out: |
483 | mutex_exit(&zvol_state_lock); | |
484 | ||
ce37ebd2 | 485 | return (SET_ERROR(error)); |
60101509 BB |
486 | } |
487 | ||
460a0213 DM |
488 | /* |
489 | * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we | |
490 | * implement DKIOCFREE/free-long-range. | |
491 | */ | |
492 | static int | |
493 | zvol_replay_truncate(zvol_state_t *zv, lr_truncate_t *lr, boolean_t byteswap) | |
494 | { | |
495 | uint64_t offset, length; | |
496 | ||
497 | if (byteswap) | |
498 | byteswap_uint64_array(lr, sizeof (*lr)); | |
499 | ||
500 | offset = lr->lr_offset; | |
501 | length = lr->lr_length; | |
502 | ||
503 | return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); | |
504 | } | |
505 | ||
60101509 BB |
506 | /* |
507 | * Replay a TX_WRITE ZIL transaction that didn't get committed | |
508 | * after a system failure | |
509 | */ | |
510 | static int | |
511 | zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) | |
512 | { | |
513 | objset_t *os = zv->zv_objset; | |
514 | char *data = (char *)(lr + 1); /* data follows lr_write_t */ | |
515 | uint64_t off = lr->lr_offset; | |
516 | uint64_t len = lr->lr_length; | |
517 | dmu_tx_t *tx; | |
518 | int error; | |
519 | ||
520 | if (byteswap) | |
521 | byteswap_uint64_array(lr, sizeof (*lr)); | |
522 | ||
523 | tx = dmu_tx_create(os); | |
524 | dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); | |
525 | error = dmu_tx_assign(tx, TXG_WAIT); | |
526 | if (error) { | |
527 | dmu_tx_abort(tx); | |
528 | } else { | |
529 | dmu_write(os, ZVOL_OBJ, off, len, data, tx); | |
530 | dmu_tx_commit(tx); | |
531 | } | |
532 | ||
ce37ebd2 | 533 | return (SET_ERROR(error)); |
60101509 BB |
534 | } |
535 | ||
536 | static int | |
537 | zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) | |
538 | { | |
2e528b49 | 539 | return (SET_ERROR(ENOTSUP)); |
60101509 BB |
540 | } |
541 | ||
542 | /* | |
543 | * Callback vectors for replaying records. | |
460a0213 | 544 | * Only TX_WRITE and TX_TRUNCATE are needed for zvol. |
60101509 | 545 | */ |
b01615d5 RY |
546 | zil_replay_func_t zvol_replay_vector[TX_MAX_TYPE] = { |
547 | (zil_replay_func_t)zvol_replay_err, /* no such transaction type */ | |
548 | (zil_replay_func_t)zvol_replay_err, /* TX_CREATE */ | |
549 | (zil_replay_func_t)zvol_replay_err, /* TX_MKDIR */ | |
550 | (zil_replay_func_t)zvol_replay_err, /* TX_MKXATTR */ | |
551 | (zil_replay_func_t)zvol_replay_err, /* TX_SYMLINK */ | |
552 | (zil_replay_func_t)zvol_replay_err, /* TX_REMOVE */ | |
553 | (zil_replay_func_t)zvol_replay_err, /* TX_RMDIR */ | |
554 | (zil_replay_func_t)zvol_replay_err, /* TX_LINK */ | |
555 | (zil_replay_func_t)zvol_replay_err, /* TX_RENAME */ | |
556 | (zil_replay_func_t)zvol_replay_write, /* TX_WRITE */ | |
460a0213 | 557 | (zil_replay_func_t)zvol_replay_truncate, /* TX_TRUNCATE */ |
b01615d5 RY |
558 | (zil_replay_func_t)zvol_replay_err, /* TX_SETATTR */ |
559 | (zil_replay_func_t)zvol_replay_err, /* TX_ACL */ | |
60101509 BB |
560 | }; |
561 | ||
562 | /* | |
563 | * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. | |
564 | * | |
565 | * We store data in the log buffers if it's small enough. | |
566 | * Otherwise we will later flush the data out via dmu_sync(). | |
567 | */ | |
568 | ssize_t zvol_immediate_write_sz = 32768; | |
569 | ||
570 | static void | |
ce37ebd2 BB |
571 | zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset, |
572 | uint64_t size, int sync) | |
60101509 BB |
573 | { |
574 | uint32_t blocksize = zv->zv_volblocksize; | |
575 | zilog_t *zilog = zv->zv_zilog; | |
576 | boolean_t slogging; | |
ab85f845 | 577 | ssize_t immediate_write_sz; |
60101509 BB |
578 | |
579 | if (zil_replaying(zilog, tx)) | |
580 | return; | |
581 | ||
ab85f845 | 582 | immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) |
02730c33 | 583 | ? 0 : zvol_immediate_write_sz; |
ab85f845 | 584 | slogging = spa_has_slogs(zilog->zl_spa) && |
02730c33 | 585 | (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); |
60101509 BB |
586 | |
587 | while (size) { | |
588 | itx_t *itx; | |
589 | lr_write_t *lr; | |
590 | ssize_t len; | |
591 | itx_wr_state_t write_state; | |
592 | ||
593 | /* | |
594 | * Unlike zfs_log_write() we can be called with | |
595 | * up to DMU_MAX_ACCESS/2 (5MB) writes. | |
596 | */ | |
ab85f845 | 597 | if (blocksize > immediate_write_sz && !slogging && |
60101509 BB |
598 | size >= blocksize && offset % blocksize == 0) { |
599 | write_state = WR_INDIRECT; /* uses dmu_sync */ | |
600 | len = blocksize; | |
601 | } else if (sync) { | |
602 | write_state = WR_COPIED; | |
603 | len = MIN(ZIL_MAX_LOG_DATA, size); | |
604 | } else { | |
605 | write_state = WR_NEED_COPY; | |
606 | len = MIN(ZIL_MAX_LOG_DATA, size); | |
607 | } | |
608 | ||
609 | itx = zil_itx_create(TX_WRITE, sizeof (*lr) + | |
610 | (write_state == WR_COPIED ? len : 0)); | |
611 | lr = (lr_write_t *)&itx->itx_lr; | |
612 | if (write_state == WR_COPIED && dmu_read(zv->zv_objset, | |
613 | ZVOL_OBJ, offset, len, lr+1, DMU_READ_NO_PREFETCH) != 0) { | |
614 | zil_itx_destroy(itx); | |
615 | itx = zil_itx_create(TX_WRITE, sizeof (*lr)); | |
616 | lr = (lr_write_t *)&itx->itx_lr; | |
617 | write_state = WR_NEED_COPY; | |
618 | } | |
619 | ||
620 | itx->itx_wr_state = write_state; | |
621 | if (write_state == WR_NEED_COPY) | |
622 | itx->itx_sod += len; | |
623 | lr->lr_foid = ZVOL_OBJ; | |
624 | lr->lr_offset = offset; | |
625 | lr->lr_length = len; | |
626 | lr->lr_blkoff = 0; | |
627 | BP_ZERO(&lr->lr_blkptr); | |
628 | ||
629 | itx->itx_private = zv; | |
630 | itx->itx_sync = sync; | |
631 | ||
632 | (void) zil_itx_assign(zilog, itx, tx); | |
633 | ||
634 | offset += len; | |
635 | size -= len; | |
636 | } | |
637 | } | |
638 | ||
37f9dac5 | 639 | static int |
a765a34a | 640 | zvol_write(zvol_state_t *zv, uio_t *uio, boolean_t sync) |
60101509 | 641 | { |
a765a34a | 642 | uint64_t volsize = zv->zv_volsize; |
60101509 | 643 | rl_t *rl; |
a765a34a | 644 | int error = 0; |
60101509 | 645 | |
5428dc51 BP |
646 | ASSERT(zv && zv->zv_open_count > 0); |
647 | ||
d88895a0 CC |
648 | rl = zfs_range_lock(&zv->zv_range_lock, uio->uio_loffset, |
649 | uio->uio_resid, RL_WRITER); | |
b18019d2 | 650 | |
a765a34a RY |
651 | while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { |
652 | uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); | |
653 | uint64_t off = uio->uio_loffset; | |
654 | dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); | |
b18019d2 | 655 | |
a765a34a RY |
656 | if (bytes > volsize - off) /* don't write past the end */ |
657 | bytes = volsize - off; | |
2727b9d3 | 658 | |
a765a34a | 659 | dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); |
60101509 | 660 | |
a765a34a RY |
661 | /* This will only fail for ENOSPC */ |
662 | error = dmu_tx_assign(tx, TXG_WAIT); | |
663 | if (error) { | |
664 | dmu_tx_abort(tx); | |
665 | break; | |
666 | } | |
667 | error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx); | |
668 | if (error == 0) | |
669 | zvol_log_write(zv, tx, off, bytes, sync); | |
670 | dmu_tx_commit(tx); | |
60101509 | 671 | |
a765a34a RY |
672 | if (error) |
673 | break; | |
60101509 | 674 | } |
60101509 | 675 | zfs_range_unlock(rl); |
a765a34a | 676 | if (sync) |
60101509 | 677 | zil_commit(zv->zv_zilog, ZVOL_OBJ); |
37f9dac5 | 678 | return (error); |
60101509 BB |
679 | } |
680 | ||
460a0213 DM |
681 | /* |
682 | * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. | |
683 | */ | |
684 | static void | |
685 | zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, | |
686 | boolean_t sync) | |
687 | { | |
688 | itx_t *itx; | |
689 | lr_truncate_t *lr; | |
690 | zilog_t *zilog = zv->zv_zilog; | |
691 | ||
692 | if (zil_replaying(zilog, tx)) | |
693 | return; | |
694 | ||
695 | itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); | |
696 | lr = (lr_truncate_t *)&itx->itx_lr; | |
697 | lr->lr_foid = ZVOL_OBJ; | |
698 | lr->lr_offset = off; | |
699 | lr->lr_length = len; | |
700 | ||
701 | itx->itx_sync = sync; | |
702 | zil_itx_assign(zilog, itx, tx); | |
703 | } | |
704 | ||
37f9dac5 RY |
705 | static int |
706 | zvol_discard(struct bio *bio) | |
30930fba | 707 | { |
37f9dac5 RY |
708 | zvol_state_t *zv = bio->bi_bdev->bd_disk->private_data; |
709 | uint64_t start = BIO_BI_SECTOR(bio) << 9; | |
710 | uint64_t size = BIO_BI_SIZE(bio); | |
711 | uint64_t end = start + size; | |
30930fba ED |
712 | int error; |
713 | rl_t *rl; | |
460a0213 | 714 | dmu_tx_t *tx; |
30930fba | 715 | |
5428dc51 BP |
716 | ASSERT(zv && zv->zv_open_count > 0); |
717 | ||
37f9dac5 RY |
718 | if (end > zv->zv_volsize) |
719 | return (SET_ERROR(EIO)); | |
30930fba | 720 | |
089fa91b | 721 | /* |
cf41432c BB |
722 | * Align the request to volume block boundaries when a secure erase is |
723 | * not required. This will prevent dnode_free_range() from zeroing out | |
724 | * the unaligned parts which is slow (read-modify-write) and useless | |
725 | * since we are not freeing any space by doing so. | |
089fa91b | 726 | */ |
cf41432c | 727 | if (!bio_is_secure_erase(bio)) { |
fa565676 RY |
728 | start = P2ROUNDUP(start, zv->zv_volblocksize); |
729 | end = P2ALIGN(end, zv->zv_volblocksize); | |
f52ebcb3 | 730 | size = end - start; |
fa565676 | 731 | } |
089fa91b | 732 | |
37f9dac5 RY |
733 | if (start >= end) |
734 | return (0); | |
30930fba | 735 | |
d88895a0 | 736 | rl = zfs_range_lock(&zv->zv_range_lock, start, size, RL_WRITER); |
460a0213 DM |
737 | tx = dmu_tx_create(zv->zv_objset); |
738 | dmu_tx_mark_netfree(tx); | |
739 | error = dmu_tx_assign(tx, TXG_WAIT); | |
740 | if (error != 0) { | |
741 | dmu_tx_abort(tx); | |
742 | } else { | |
743 | zvol_log_truncate(zv, tx, start, size, B_TRUE); | |
744 | dmu_tx_commit(tx); | |
745 | error = dmu_free_long_range(zv->zv_objset, | |
746 | ZVOL_OBJ, start, size); | |
747 | } | |
30930fba ED |
748 | |
749 | zfs_range_unlock(rl); | |
37f9dac5 RY |
750 | |
751 | return (error); | |
30930fba | 752 | } |
30930fba | 753 | |
37f9dac5 | 754 | static int |
a765a34a | 755 | zvol_read(zvol_state_t *zv, uio_t *uio) |
60101509 | 756 | { |
a765a34a | 757 | uint64_t volsize = zv->zv_volsize; |
60101509 | 758 | rl_t *rl; |
a765a34a | 759 | int error = 0; |
b18019d2 | 760 | |
5428dc51 BP |
761 | ASSERT(zv && zv->zv_open_count > 0); |
762 | ||
d88895a0 CC |
763 | rl = zfs_range_lock(&zv->zv_range_lock, uio->uio_loffset, |
764 | uio->uio_resid, RL_READER); | |
a765a34a RY |
765 | while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { |
766 | uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); | |
60101509 | 767 | |
a765a34a RY |
768 | /* don't read past the end */ |
769 | if (bytes > volsize - uio->uio_loffset) | |
770 | bytes = volsize - uio->uio_loffset; | |
60101509 | 771 | |
19a47cb1 | 772 | error = dmu_read_uio_dbuf(zv->zv_dbuf, uio, bytes); |
a765a34a RY |
773 | if (error) { |
774 | /* convert checksum errors into IO errors */ | |
775 | if (error == ECKSUM) | |
776 | error = SET_ERROR(EIO); | |
777 | break; | |
778 | } | |
779 | } | |
60101509 | 780 | zfs_range_unlock(rl); |
37f9dac5 | 781 | return (error); |
60101509 BB |
782 | } |
783 | ||
37f9dac5 RY |
784 | static MAKE_REQUEST_FN_RET |
785 | zvol_request(struct request_queue *q, struct bio *bio) | |
60101509 | 786 | { |
a765a34a | 787 | uio_t uio; |
60101509 | 788 | zvol_state_t *zv = q->queuedata; |
37f9dac5 | 789 | fstrans_cookie_t cookie = spl_fstrans_mark(); |
8198d18c RY |
790 | int rw = bio_data_dir(bio); |
791 | #ifdef HAVE_GENERIC_IO_ACCT | |
792 | unsigned long start = jiffies; | |
793 | #endif | |
37f9dac5 | 794 | int error = 0; |
60101509 | 795 | |
040dab99 CC |
796 | rw_enter(&zv->zv_suspend_lock, RW_READER); |
797 | ||
a765a34a RY |
798 | uio.uio_bvec = &bio->bi_io_vec[BIO_BI_IDX(bio)]; |
799 | uio.uio_skip = BIO_BI_SKIP(bio); | |
800 | uio.uio_resid = BIO_BI_SIZE(bio); | |
801 | uio.uio_iovcnt = bio->bi_vcnt - BIO_BI_IDX(bio); | |
802 | uio.uio_loffset = BIO_BI_SECTOR(bio) << 9; | |
803 | uio.uio_limit = MAXOFFSET_T; | |
804 | uio.uio_segflg = UIO_BVEC; | |
805 | ||
806 | if (bio_has_data(bio) && uio.uio_loffset + uio.uio_resid > | |
807 | zv->zv_volsize) { | |
37f9dac5 | 808 | printk(KERN_INFO |
a765a34a | 809 | "%s: bad access: offset=%llu, size=%lu\n", |
37f9dac5 | 810 | zv->zv_disk->disk_name, |
a765a34a RY |
811 | (long long unsigned)uio.uio_loffset, |
812 | (long unsigned)uio.uio_resid); | |
37f9dac5 | 813 | error = SET_ERROR(EIO); |
8198d18c | 814 | goto out1; |
37f9dac5 RY |
815 | } |
816 | ||
a765a34a | 817 | generic_start_io_acct(rw, bio_sectors(bio), &zv->zv_disk->part0); |
8198d18c RY |
818 | |
819 | if (rw == WRITE) { | |
37f9dac5 RY |
820 | if (unlikely(zv->zv_flags & ZVOL_RDONLY)) { |
821 | error = SET_ERROR(EROFS); | |
8198d18c | 822 | goto out2; |
60101509 BB |
823 | } |
824 | ||
cf41432c | 825 | if (bio_is_discard(bio) || bio_is_secure_erase(bio)) { |
37f9dac5 | 826 | error = zvol_discard(bio); |
8198d18c | 827 | goto out2; |
37f9dac5 | 828 | } |
60101509 | 829 | |
a765a34a RY |
830 | /* |
831 | * Some requests are just for flush and nothing else. | |
832 | */ | |
833 | if (uio.uio_resid == 0) { | |
cf41432c | 834 | if (bio_is_flush(bio)) |
a765a34a RY |
835 | zil_commit(zv->zv_zilog, ZVOL_OBJ); |
836 | goto out2; | |
837 | } | |
838 | ||
839 | error = zvol_write(zv, &uio, | |
cf41432c BB |
840 | bio_is_flush(bio) || bio_is_fua(bio) || |
841 | zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); | |
37f9dac5 | 842 | } else |
a765a34a | 843 | error = zvol_read(zv, &uio); |
30930fba | 844 | |
8198d18c RY |
845 | out2: |
846 | generic_end_io_acct(rw, &zv->zv_disk->part0, start); | |
847 | out1: | |
784a7fe5 | 848 | BIO_END_IO(bio, -error); |
040dab99 | 849 | rw_exit(&zv->zv_suspend_lock); |
37f9dac5 RY |
850 | spl_fstrans_unmark(cookie); |
851 | #ifdef HAVE_MAKE_REQUEST_FN_RET_INT | |
852 | return (0); | |
1a093716 CC |
853 | #elif defined(HAVE_MAKE_REQUEST_FN_RET_QC) |
854 | return (BLK_QC_T_NONE); | |
37f9dac5 | 855 | #endif |
60101509 BB |
856 | } |
857 | ||
858 | static void | |
859 | zvol_get_done(zgd_t *zgd, int error) | |
860 | { | |
861 | if (zgd->zgd_db) | |
862 | dmu_buf_rele(zgd->zgd_db, zgd); | |
863 | ||
864 | zfs_range_unlock(zgd->zgd_rl); | |
865 | ||
866 | if (error == 0 && zgd->zgd_bp) | |
867 | zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); | |
868 | ||
869 | kmem_free(zgd, sizeof (zgd_t)); | |
870 | } | |
871 | ||
872 | /* | |
873 | * Get data to generate a TX_WRITE intent log record. | |
874 | */ | |
875 | static int | |
876 | zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) | |
877 | { | |
878 | zvol_state_t *zv = arg; | |
879 | objset_t *os = zv->zv_objset; | |
03c6040b | 880 | uint64_t object = ZVOL_OBJ; |
60101509 BB |
881 | uint64_t offset = lr->lr_offset; |
882 | uint64_t size = lr->lr_length; | |
03c6040b | 883 | blkptr_t *bp = &lr->lr_blkptr; |
60101509 BB |
884 | dmu_buf_t *db; |
885 | zgd_t *zgd; | |
886 | int error; | |
887 | ||
888 | ASSERT(zio != NULL); | |
889 | ASSERT(size != 0); | |
890 | ||
79c76d5b | 891 | zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP); |
60101509 | 892 | zgd->zgd_zilog = zv->zv_zilog; |
d88895a0 CC |
893 | zgd->zgd_rl = zfs_range_lock(&zv->zv_range_lock, offset, size, |
894 | RL_READER); | |
60101509 BB |
895 | |
896 | /* | |
897 | * Write records come in two flavors: immediate and indirect. | |
898 | * For small writes it's cheaper to store the data with the | |
899 | * log record (immediate); for large writes it's cheaper to | |
900 | * sync the data and get a pointer to it (indirect) so that | |
901 | * we don't have to write the data twice. | |
902 | */ | |
903 | if (buf != NULL) { /* immediate write */ | |
03c6040b | 904 | error = dmu_read(os, object, offset, size, buf, |
60101509 BB |
905 | DMU_READ_NO_PREFETCH); |
906 | } else { | |
907 | size = zv->zv_volblocksize; | |
908 | offset = P2ALIGN_TYPED(offset, size, uint64_t); | |
03c6040b | 909 | error = dmu_buf_hold(os, object, offset, zgd, &db, |
60101509 BB |
910 | DMU_READ_NO_PREFETCH); |
911 | if (error == 0) { | |
03c6040b GW |
912 | blkptr_t *obp = dmu_buf_get_blkptr(db); |
913 | if (obp) { | |
914 | ASSERT(BP_IS_HOLE(bp)); | |
915 | *bp = *obp; | |
916 | } | |
917 | ||
60101509 BB |
918 | zgd->zgd_db = db; |
919 | zgd->zgd_bp = &lr->lr_blkptr; | |
920 | ||
921 | ASSERT(db != NULL); | |
922 | ASSERT(db->db_offset == offset); | |
923 | ASSERT(db->db_size == size); | |
924 | ||
925 | error = dmu_sync(zio, lr->lr_common.lrc_txg, | |
926 | zvol_get_done, zgd); | |
927 | ||
928 | if (error == 0) | |
929 | return (0); | |
930 | } | |
931 | } | |
932 | ||
933 | zvol_get_done(zgd, error); | |
934 | ||
ce37ebd2 | 935 | return (SET_ERROR(error)); |
60101509 BB |
936 | } |
937 | ||
938 | /* | |
d45e010d | 939 | * The zvol_state_t's are inserted into zvol_state_list and zvol_htable. |
60101509 BB |
940 | */ |
941 | static void | |
d45e010d | 942 | zvol_insert(zvol_state_t *zv) |
60101509 | 943 | { |
60101509 | 944 | ASSERT(MUTEX_HELD(&zvol_state_lock)); |
d45e010d CC |
945 | ASSERT3U(MINOR(zv->zv_dev) & ZVOL_MINOR_MASK, ==, 0); |
946 | list_insert_head(&zvol_state_list, zv); | |
947 | hlist_add_head(&zv->zv_hlink, ZVOL_HT_HEAD(zv->zv_hash)); | |
60101509 BB |
948 | } |
949 | ||
950 | /* | |
951 | * Simply remove the zvol from to list of zvols. | |
952 | */ | |
953 | static void | |
d45e010d | 954 | zvol_remove(zvol_state_t *zv) |
60101509 BB |
955 | { |
956 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
d45e010d CC |
957 | list_remove(&zvol_state_list, zv); |
958 | hlist_del(&zv->zv_hlink); | |
60101509 BB |
959 | } |
960 | ||
040dab99 CC |
961 | /* |
962 | * Setup zv after we just own the zv->objset | |
963 | */ | |
60101509 | 964 | static int |
040dab99 | 965 | zvol_setup_zv(zvol_state_t *zv) |
60101509 | 966 | { |
60101509 BB |
967 | uint64_t volsize; |
968 | int error; | |
969 | uint64_t ro; | |
040dab99 | 970 | objset_t *os = zv->zv_objset; |
1ee159f4 BP |
971 | |
972 | error = dsl_prop_get_integer(zv->zv_name, "readonly", &ro, NULL); | |
973 | if (error) | |
040dab99 | 974 | return (SET_ERROR(error)); |
60101509 BB |
975 | |
976 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); | |
1ee159f4 | 977 | if (error) |
040dab99 | 978 | return (SET_ERROR(error)); |
60101509 | 979 | |
040dab99 | 980 | error = dmu_bonus_hold(os, ZVOL_OBJ, zv, &zv->zv_dbuf); |
1ee159f4 | 981 | if (error) |
040dab99 | 982 | return (SET_ERROR(error)); |
60101509 BB |
983 | |
984 | set_capacity(zv->zv_disk, volsize >> 9); | |
985 | zv->zv_volsize = volsize; | |
986 | zv->zv_zilog = zil_open(os, zvol_get_data); | |
987 | ||
a4430fce GW |
988 | if (ro || dmu_objset_is_snapshot(os) || |
989 | !spa_writeable(dmu_objset_spa(os))) { | |
babf3f9b MM |
990 | set_disk_ro(zv->zv_disk, 1); |
991 | zv->zv_flags |= ZVOL_RDONLY; | |
60101509 | 992 | } else { |
babf3f9b MM |
993 | set_disk_ro(zv->zv_disk, 0); |
994 | zv->zv_flags &= ~ZVOL_RDONLY; | |
60101509 | 995 | } |
040dab99 | 996 | return (0); |
60101509 BB |
997 | } |
998 | ||
040dab99 CC |
999 | /* |
1000 | * Shutdown every zv_objset related stuff except zv_objset itself. | |
1001 | * The is the reverse of zvol_setup_zv. | |
1002 | */ | |
60101509 | 1003 | static void |
040dab99 | 1004 | zvol_shutdown_zv(zvol_state_t *zv) |
60101509 BB |
1005 | { |
1006 | zil_close(zv->zv_zilog); | |
1007 | zv->zv_zilog = NULL; | |
04434775 | 1008 | |
040dab99 | 1009 | dmu_buf_rele(zv->zv_dbuf, zv); |
60101509 | 1010 | zv->zv_dbuf = NULL; |
04434775 MA |
1011 | |
1012 | /* | |
1013 | * Evict cached data | |
1014 | */ | |
1015 | if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) && | |
1016 | !(zv->zv_flags & ZVOL_RDONLY)) | |
1017 | txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); | |
1018 | (void) dmu_objset_evict_dbufs(zv->zv_objset); | |
040dab99 CC |
1019 | } |
1020 | ||
1021 | /* | |
1022 | * return the proper tag for rollback and recv | |
1023 | */ | |
1024 | void * | |
1025 | zvol_tag(zvol_state_t *zv) | |
1026 | { | |
1027 | ASSERT(RW_WRITE_HELD(&zv->zv_suspend_lock)); | |
1028 | return (zv->zv_open_count > 0 ? zv : NULL); | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * Suspend the zvol for recv and rollback. | |
1033 | */ | |
1034 | zvol_state_t * | |
1035 | zvol_suspend(const char *name) | |
1036 | { | |
1037 | zvol_state_t *zv; | |
1038 | ||
1039 | mutex_enter(&zvol_state_lock); | |
1040 | zv = zvol_find_by_name(name); | |
1041 | if (zv == NULL) | |
1042 | goto out; | |
04434775 | 1043 | |
040dab99 CC |
1044 | /* block all I/O, release in zvol_resume. */ |
1045 | rw_enter(&zv->zv_suspend_lock, RW_WRITER); | |
1046 | ||
1047 | atomic_inc(&zv->zv_suspend_ref); | |
1048 | ||
1049 | if (zv->zv_open_count > 0) | |
1050 | zvol_shutdown_zv(zv); | |
1051 | out: | |
1052 | mutex_exit(&zvol_state_lock); | |
1053 | return (zv); | |
1054 | } | |
1055 | ||
1056 | int | |
1057 | zvol_resume(zvol_state_t *zv) | |
1058 | { | |
1059 | int error = 0; | |
1060 | ||
1061 | ASSERT(RW_WRITE_HELD(&zv->zv_suspend_lock)); | |
1062 | if (zv->zv_open_count > 0) { | |
1063 | VERIFY0(dmu_objset_hold(zv->zv_name, zv, &zv->zv_objset)); | |
1064 | VERIFY3P(zv->zv_objset->os_dsl_dataset->ds_owner, ==, zv); | |
1065 | VERIFY(dsl_dataset_long_held(zv->zv_objset->os_dsl_dataset)); | |
1066 | dmu_objset_rele(zv->zv_objset, zv); | |
1067 | ||
1068 | error = zvol_setup_zv(zv); | |
1069 | } | |
1070 | rw_exit(&zv->zv_suspend_lock); | |
1071 | /* | |
1072 | * We need this because we don't hold zvol_state_lock while releasing | |
1073 | * zv_suspend_lock. zvol_remove_minors_impl thus cannot check | |
1074 | * zv_suspend_lock to determine it is safe to free because rwlock is | |
1075 | * not inherent atomic. | |
1076 | */ | |
1077 | atomic_dec(&zv->zv_suspend_ref); | |
1078 | ||
1079 | return (SET_ERROR(error)); | |
1080 | } | |
1081 | ||
1082 | static int | |
1083 | zvol_first_open(zvol_state_t *zv) | |
1084 | { | |
1085 | objset_t *os; | |
1086 | int error; | |
1087 | ||
1088 | /* lie and say we're read-only */ | |
1089 | error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, 1, zv, &os); | |
1090 | if (error) | |
1091 | return (SET_ERROR(-error)); | |
1092 | ||
1093 | zv->zv_objset = os; | |
1094 | ||
1095 | error = zvol_setup_zv(zv); | |
1096 | ||
1097 | if (error) { | |
1098 | dmu_objset_disown(os, zv); | |
1099 | zv->zv_objset = NULL; | |
1100 | } | |
1101 | ||
1102 | return (SET_ERROR(-error)); | |
1103 | } | |
1104 | ||
1105 | static void | |
1106 | zvol_last_close(zvol_state_t *zv) | |
1107 | { | |
1108 | zvol_shutdown_zv(zv); | |
1109 | ||
1110 | dmu_objset_disown(zv->zv_objset, zv); | |
60101509 BB |
1111 | zv->zv_objset = NULL; |
1112 | } | |
1113 | ||
1114 | static int | |
1115 | zvol_open(struct block_device *bdev, fmode_t flag) | |
1116 | { | |
5428dc51 | 1117 | zvol_state_t *zv; |
040dab99 | 1118 | int error = 0, drop_mutex = 0, drop_suspend = 0; |
60101509 BB |
1119 | |
1120 | /* | |
1121 | * If the caller is already holding the mutex do not take it | |
a0bd735a | 1122 | * again, this will happen as part of zvol_create_minor_impl(). |
60101509 BB |
1123 | * Once add_disk() is called the device is live and the kernel |
1124 | * will attempt to open it to read the partition information. | |
1125 | */ | |
1126 | if (!mutex_owned(&zvol_state_lock)) { | |
1127 | mutex_enter(&zvol_state_lock); | |
1128 | drop_mutex = 1; | |
1129 | } | |
1130 | ||
5428dc51 BP |
1131 | /* |
1132 | * Obtain a copy of private_data under the lock to make sure | |
899662e3 | 1133 | * that either the result of zvol_free() setting |
5428dc51 BP |
1134 | * bdev->bd_disk->private_data to NULL is observed, or zvol_free() |
1135 | * is not called on this zv because of the positive zv_open_count. | |
1136 | */ | |
1137 | zv = bdev->bd_disk->private_data; | |
1138 | if (zv == NULL) { | |
1139 | error = -ENXIO; | |
1140 | goto out_mutex; | |
1141 | } | |
60101509 BB |
1142 | |
1143 | if (zv->zv_open_count == 0) { | |
040dab99 CC |
1144 | /* make sure zvol is not suspended when first open */ |
1145 | rw_enter(&zv->zv_suspend_lock, RW_READER); | |
1146 | drop_suspend = 1; | |
1147 | ||
60101509 BB |
1148 | error = zvol_first_open(zv); |
1149 | if (error) | |
1150 | goto out_mutex; | |
1151 | } | |
1152 | ||
ba6a2402 | 1153 | if ((flag & FMODE_WRITE) && (zv->zv_flags & ZVOL_RDONLY)) { |
60101509 BB |
1154 | error = -EROFS; |
1155 | goto out_open_count; | |
1156 | } | |
1157 | ||
1158 | zv->zv_open_count++; | |
1159 | ||
5428dc51 BP |
1160 | check_disk_change(bdev); |
1161 | ||
60101509 BB |
1162 | out_open_count: |
1163 | if (zv->zv_open_count == 0) | |
1164 | zvol_last_close(zv); | |
60101509 | 1165 | out_mutex: |
040dab99 CC |
1166 | if (drop_suspend) |
1167 | rw_exit(&zv->zv_suspend_lock); | |
60101509 BB |
1168 | if (drop_mutex) |
1169 | mutex_exit(&zvol_state_lock); | |
1170 | ||
ce37ebd2 | 1171 | return (SET_ERROR(error)); |
60101509 BB |
1172 | } |
1173 | ||
a1d9543a CD |
1174 | #ifdef HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID |
1175 | static void | |
1176 | #else | |
60101509 | 1177 | static int |
a1d9543a | 1178 | #endif |
60101509 BB |
1179 | zvol_release(struct gendisk *disk, fmode_t mode) |
1180 | { | |
1181 | zvol_state_t *zv = disk->private_data; | |
1182 | int drop_mutex = 0; | |
1183 | ||
5428dc51 BP |
1184 | ASSERT(zv && zv->zv_open_count > 0); |
1185 | ||
60101509 BB |
1186 | if (!mutex_owned(&zvol_state_lock)) { |
1187 | mutex_enter(&zvol_state_lock); | |
1188 | drop_mutex = 1; | |
1189 | } | |
1190 | ||
040dab99 CC |
1191 | /* make sure zvol is not suspended when last close */ |
1192 | if (zv->zv_open_count == 1) | |
1193 | rw_enter(&zv->zv_suspend_lock, RW_READER); | |
1194 | ||
5428dc51 | 1195 | zv->zv_open_count--; |
040dab99 | 1196 | if (zv->zv_open_count == 0) { |
5428dc51 | 1197 | zvol_last_close(zv); |
040dab99 CC |
1198 | rw_exit(&zv->zv_suspend_lock); |
1199 | } | |
60101509 BB |
1200 | |
1201 | if (drop_mutex) | |
1202 | mutex_exit(&zvol_state_lock); | |
1203 | ||
a1d9543a | 1204 | #ifndef HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID |
60101509 | 1205 | return (0); |
a1d9543a | 1206 | #endif |
60101509 BB |
1207 | } |
1208 | ||
1209 | static int | |
1210 | zvol_ioctl(struct block_device *bdev, fmode_t mode, | |
ce37ebd2 | 1211 | unsigned int cmd, unsigned long arg) |
60101509 BB |
1212 | { |
1213 | zvol_state_t *zv = bdev->bd_disk->private_data; | |
1214 | int error = 0; | |
1215 | ||
5428dc51 | 1216 | ASSERT(zv && zv->zv_open_count > 0); |
60101509 | 1217 | |
040dab99 | 1218 | rw_enter(&zv->zv_suspend_lock, RW_READER); |
60101509 BB |
1219 | switch (cmd) { |
1220 | case BLKFLSBUF: | |
1221 | zil_commit(zv->zv_zilog, ZVOL_OBJ); | |
1222 | break; | |
4c0d8e50 FN |
1223 | case BLKZNAME: |
1224 | error = copy_to_user((void *)arg, zv->zv_name, MAXNAMELEN); | |
1225 | break; | |
60101509 BB |
1226 | |
1227 | default: | |
1228 | error = -ENOTTY; | |
1229 | break; | |
60101509 | 1230 | } |
040dab99 | 1231 | rw_exit(&zv->zv_suspend_lock); |
60101509 | 1232 | |
ce37ebd2 | 1233 | return (SET_ERROR(error)); |
60101509 BB |
1234 | } |
1235 | ||
1236 | #ifdef CONFIG_COMPAT | |
1237 | static int | |
1238 | zvol_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
ce37ebd2 | 1239 | unsigned cmd, unsigned long arg) |
60101509 | 1240 | { |
ce37ebd2 | 1241 | return (zvol_ioctl(bdev, mode, cmd, arg)); |
60101509 BB |
1242 | } |
1243 | #else | |
ce37ebd2 | 1244 | #define zvol_compat_ioctl NULL |
60101509 BB |
1245 | #endif |
1246 | ||
1247 | static int zvol_media_changed(struct gendisk *disk) | |
1248 | { | |
1249 | zvol_state_t *zv = disk->private_data; | |
1250 | ||
5428dc51 BP |
1251 | ASSERT(zv && zv->zv_open_count > 0); |
1252 | ||
ce37ebd2 | 1253 | return (zv->zv_changed); |
60101509 BB |
1254 | } |
1255 | ||
1256 | static int zvol_revalidate_disk(struct gendisk *disk) | |
1257 | { | |
1258 | zvol_state_t *zv = disk->private_data; | |
1259 | ||
5428dc51 BP |
1260 | ASSERT(zv && zv->zv_open_count > 0); |
1261 | ||
60101509 BB |
1262 | zv->zv_changed = 0; |
1263 | set_capacity(zv->zv_disk, zv->zv_volsize >> 9); | |
1264 | ||
ce37ebd2 | 1265 | return (0); |
60101509 BB |
1266 | } |
1267 | ||
1268 | /* | |
1269 | * Provide a simple virtual geometry for legacy compatibility. For devices | |
1270 | * smaller than 1 MiB a small head and sector count is used to allow very | |
1271 | * tiny devices. For devices over 1 Mib a standard head and sector count | |
1272 | * is used to keep the cylinders count reasonable. | |
1273 | */ | |
1274 | static int | |
1275 | zvol_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
1276 | { | |
1277 | zvol_state_t *zv = bdev->bd_disk->private_data; | |
5428dc51 BP |
1278 | sector_t sectors; |
1279 | ||
1280 | ASSERT(zv && zv->zv_open_count > 0); | |
1281 | ||
1282 | sectors = get_capacity(zv->zv_disk); | |
60101509 BB |
1283 | |
1284 | if (sectors > 2048) { | |
1285 | geo->heads = 16; | |
1286 | geo->sectors = 63; | |
1287 | } else { | |
1288 | geo->heads = 2; | |
1289 | geo->sectors = 4; | |
1290 | } | |
1291 | ||
1292 | geo->start = 0; | |
1293 | geo->cylinders = sectors / (geo->heads * geo->sectors); | |
1294 | ||
ce37ebd2 | 1295 | return (0); |
60101509 BB |
1296 | } |
1297 | ||
1298 | static struct kobject * | |
1299 | zvol_probe(dev_t dev, int *part, void *arg) | |
1300 | { | |
1301 | zvol_state_t *zv; | |
1302 | struct kobject *kobj; | |
1303 | ||
1304 | mutex_enter(&zvol_state_lock); | |
1305 | zv = zvol_find_by_dev(dev); | |
23a61ccc | 1306 | kobj = zv ? get_disk(zv->zv_disk) : NULL; |
60101509 BB |
1307 | mutex_exit(&zvol_state_lock); |
1308 | ||
ce37ebd2 | 1309 | return (kobj); |
60101509 BB |
1310 | } |
1311 | ||
1312 | #ifdef HAVE_BDEV_BLOCK_DEVICE_OPERATIONS | |
1313 | static struct block_device_operations zvol_ops = { | |
ce37ebd2 BB |
1314 | .open = zvol_open, |
1315 | .release = zvol_release, | |
1316 | .ioctl = zvol_ioctl, | |
1317 | .compat_ioctl = zvol_compat_ioctl, | |
1318 | .media_changed = zvol_media_changed, | |
1319 | .revalidate_disk = zvol_revalidate_disk, | |
1320 | .getgeo = zvol_getgeo, | |
1321 | .owner = THIS_MODULE, | |
60101509 BB |
1322 | }; |
1323 | ||
1324 | #else /* HAVE_BDEV_BLOCK_DEVICE_OPERATIONS */ | |
1325 | ||
1326 | static int | |
1327 | zvol_open_by_inode(struct inode *inode, struct file *file) | |
1328 | { | |
ce37ebd2 | 1329 | return (zvol_open(inode->i_bdev, file->f_mode)); |
60101509 BB |
1330 | } |
1331 | ||
1332 | static int | |
1333 | zvol_release_by_inode(struct inode *inode, struct file *file) | |
1334 | { | |
ce37ebd2 | 1335 | return (zvol_release(inode->i_bdev->bd_disk, file->f_mode)); |
60101509 BB |
1336 | } |
1337 | ||
1338 | static int | |
1339 | zvol_ioctl_by_inode(struct inode *inode, struct file *file, | |
ce37ebd2 | 1340 | unsigned int cmd, unsigned long arg) |
60101509 | 1341 | { |
b1c58213 | 1342 | if (file == NULL || inode == NULL) |
ce37ebd2 BB |
1343 | return (SET_ERROR(-EINVAL)); |
1344 | ||
1345 | return (zvol_ioctl(inode->i_bdev, file->f_mode, cmd, arg)); | |
60101509 BB |
1346 | } |
1347 | ||
ce37ebd2 | 1348 | #ifdef CONFIG_COMPAT |
60101509 BB |
1349 | static long |
1350 | zvol_compat_ioctl_by_inode(struct file *file, | |
ce37ebd2 | 1351 | unsigned int cmd, unsigned long arg) |
60101509 | 1352 | { |
b1c58213 | 1353 | if (file == NULL) |
ce37ebd2 BB |
1354 | return (SET_ERROR(-EINVAL)); |
1355 | ||
1356 | return (zvol_compat_ioctl(file->f_dentry->d_inode->i_bdev, | |
1357 | file->f_mode, cmd, arg)); | |
60101509 | 1358 | } |
ce37ebd2 BB |
1359 | #else |
1360 | #define zvol_compat_ioctl_by_inode NULL | |
1361 | #endif | |
60101509 BB |
1362 | |
1363 | static struct block_device_operations zvol_ops = { | |
ce37ebd2 BB |
1364 | .open = zvol_open_by_inode, |
1365 | .release = zvol_release_by_inode, | |
1366 | .ioctl = zvol_ioctl_by_inode, | |
1367 | .compat_ioctl = zvol_compat_ioctl_by_inode, | |
1368 | .media_changed = zvol_media_changed, | |
1369 | .revalidate_disk = zvol_revalidate_disk, | |
1370 | .getgeo = zvol_getgeo, | |
1371 | .owner = THIS_MODULE, | |
60101509 BB |
1372 | }; |
1373 | #endif /* HAVE_BDEV_BLOCK_DEVICE_OPERATIONS */ | |
1374 | ||
1375 | /* | |
1376 | * Allocate memory for a new zvol_state_t and setup the required | |
1377 | * request queue and generic disk structures for the block device. | |
1378 | */ | |
1379 | static zvol_state_t * | |
1380 | zvol_alloc(dev_t dev, const char *name) | |
1381 | { | |
1382 | zvol_state_t *zv; | |
1383 | ||
79c76d5b | 1384 | zv = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); |
60101509 | 1385 | |
2a3871d4 RY |
1386 | list_link_init(&zv->zv_next); |
1387 | ||
37f9dac5 | 1388 | zv->zv_queue = blk_alloc_queue(GFP_ATOMIC); |
60101509 BB |
1389 | if (zv->zv_queue == NULL) |
1390 | goto out_kmem; | |
1391 | ||
37f9dac5 | 1392 | blk_queue_make_request(zv->zv_queue, zvol_request); |
cf41432c | 1393 | blk_queue_set_write_cache(zv->zv_queue, B_TRUE, B_TRUE); |
b18019d2 | 1394 | |
60101509 BB |
1395 | zv->zv_disk = alloc_disk(ZVOL_MINORS); |
1396 | if (zv->zv_disk == NULL) | |
1397 | goto out_queue; | |
1398 | ||
1399 | zv->zv_queue->queuedata = zv; | |
1400 | zv->zv_dev = dev; | |
1401 | zv->zv_open_count = 0; | |
4c0d8e50 | 1402 | strlcpy(zv->zv_name, name, MAXNAMELEN); |
60101509 | 1403 | |
d88895a0 | 1404 | zfs_rlock_init(&zv->zv_range_lock); |
040dab99 | 1405 | rw_init(&zv->zv_suspend_lock, NULL, RW_DEFAULT, NULL); |
3c4988c8 | 1406 | |
60101509 BB |
1407 | zv->zv_disk->major = zvol_major; |
1408 | zv->zv_disk->first_minor = (dev & MINORMASK); | |
1409 | zv->zv_disk->fops = &zvol_ops; | |
1410 | zv->zv_disk->private_data = zv; | |
1411 | zv->zv_disk->queue = zv->zv_queue; | |
4c0d8e50 FN |
1412 | snprintf(zv->zv_disk->disk_name, DISK_NAME_LEN, "%s%d", |
1413 | ZVOL_DEV_NAME, (dev & MINORMASK)); | |
60101509 | 1414 | |
ce37ebd2 | 1415 | return (zv); |
60101509 BB |
1416 | |
1417 | out_queue: | |
1418 | blk_cleanup_queue(zv->zv_queue); | |
1419 | out_kmem: | |
1420 | kmem_free(zv, sizeof (zvol_state_t)); | |
0a6bef26 | 1421 | |
ce37ebd2 | 1422 | return (NULL); |
60101509 BB |
1423 | } |
1424 | ||
1425 | /* | |
899662e3 CC |
1426 | * Used for taskq, if used out side zvol_state_lock, you need to clear |
1427 | * zv_disk->private_data inside lock first. | |
60101509 BB |
1428 | */ |
1429 | static void | |
899662e3 | 1430 | zvol_free_impl(void *arg) |
60101509 | 1431 | { |
899662e3 | 1432 | zvol_state_t *zv = arg; |
5428dc51 BP |
1433 | ASSERT(zv->zv_open_count == 0); |
1434 | ||
040dab99 | 1435 | rw_destroy(&zv->zv_suspend_lock); |
d88895a0 | 1436 | zfs_rlock_destroy(&zv->zv_range_lock); |
60101509 | 1437 | |
5428dc51 BP |
1438 | zv->zv_disk->private_data = NULL; |
1439 | ||
60101509 BB |
1440 | del_gendisk(zv->zv_disk); |
1441 | blk_cleanup_queue(zv->zv_queue); | |
1442 | put_disk(zv->zv_disk); | |
1443 | ||
d45e010d | 1444 | ida_simple_remove(&zvol_ida, MINOR(zv->zv_dev) >> ZVOL_MINOR_BITS); |
60101509 BB |
1445 | kmem_free(zv, sizeof (zvol_state_t)); |
1446 | } | |
1447 | ||
899662e3 CC |
1448 | /* |
1449 | * Cleanup then free a zvol_state_t which was created by zvol_alloc(). | |
1450 | */ | |
1451 | static void | |
1452 | zvol_free(zvol_state_t *zv) | |
1453 | { | |
1454 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
1455 | zvol_free_impl(zv); | |
1456 | } | |
1457 | ||
a0bd735a BP |
1458 | /* |
1459 | * Create a block device minor node and setup the linkage between it | |
1460 | * and the specified volume. Once this function returns the block | |
1461 | * device is live and ready for use. | |
1462 | */ | |
60101509 | 1463 | static int |
a0bd735a | 1464 | zvol_create_minor_impl(const char *name) |
60101509 BB |
1465 | { |
1466 | zvol_state_t *zv; | |
1467 | objset_t *os; | |
1468 | dmu_object_info_t *doi; | |
1469 | uint64_t volsize; | |
9965059a | 1470 | uint64_t len; |
60101509 BB |
1471 | unsigned minor = 0; |
1472 | int error = 0; | |
d45e010d CC |
1473 | int idx; |
1474 | uint64_t hash = zvol_name_hash(name); | |
1475 | ||
1476 | idx = ida_simple_get(&zvol_ida, 0, 0, kmem_flags_convert(KM_SLEEP)); | |
1477 | if (idx < 0) | |
1478 | return (SET_ERROR(-idx)); | |
1479 | minor = idx << ZVOL_MINOR_BITS; | |
60101509 | 1480 | |
a0bd735a | 1481 | mutex_enter(&zvol_state_lock); |
60101509 | 1482 | |
d45e010d | 1483 | zv = zvol_find_by_name_hash(name, hash); |
60101509 | 1484 | if (zv) { |
2e528b49 | 1485 | error = SET_ERROR(EEXIST); |
60101509 BB |
1486 | goto out; |
1487 | } | |
1488 | ||
79c76d5b | 1489 | doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP); |
60101509 | 1490 | |
040dab99 | 1491 | error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os); |
60101509 BB |
1492 | if (error) |
1493 | goto out_doi; | |
1494 | ||
1495 | error = dmu_object_info(os, ZVOL_OBJ, doi); | |
1496 | if (error) | |
1497 | goto out_dmu_objset_disown; | |
1498 | ||
1499 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); | |
1500 | if (error) | |
1501 | goto out_dmu_objset_disown; | |
1502 | ||
60101509 BB |
1503 | zv = zvol_alloc(MKDEV(zvol_major, minor), name); |
1504 | if (zv == NULL) { | |
2e528b49 | 1505 | error = SET_ERROR(EAGAIN); |
60101509 BB |
1506 | goto out_dmu_objset_disown; |
1507 | } | |
d45e010d | 1508 | zv->zv_hash = hash; |
60101509 BB |
1509 | |
1510 | if (dmu_objset_is_snapshot(os)) | |
1511 | zv->zv_flags |= ZVOL_RDONLY; | |
1512 | ||
1513 | zv->zv_volblocksize = doi->doi_data_block_size; | |
1514 | zv->zv_volsize = volsize; | |
1515 | zv->zv_objset = os; | |
1516 | ||
1517 | set_capacity(zv->zv_disk, zv->zv_volsize >> 9); | |
1518 | ||
c495fe2c | 1519 | blk_queue_max_hw_sectors(zv->zv_queue, (DMU_MAX_ACCESS / 4) >> 9); |
34037afe ED |
1520 | blk_queue_max_segments(zv->zv_queue, UINT16_MAX); |
1521 | blk_queue_max_segment_size(zv->zv_queue, UINT_MAX); | |
1522 | blk_queue_physical_block_size(zv->zv_queue, zv->zv_volblocksize); | |
1523 | blk_queue_io_opt(zv->zv_queue, zv->zv_volblocksize); | |
7c0e5708 ED |
1524 | blk_queue_max_discard_sectors(zv->zv_queue, |
1525 | (zvol_max_discard_blocks * zv->zv_volblocksize) >> 9); | |
ee5fd0bb | 1526 | blk_queue_discard_granularity(zv->zv_queue, zv->zv_volblocksize); |
30930fba | 1527 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, zv->zv_queue); |
37f9dac5 | 1528 | #ifdef QUEUE_FLAG_NONROT |
34037afe ED |
1529 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zv->zv_queue); |
1530 | #endif | |
c6a3a222 RY |
1531 | #ifdef QUEUE_FLAG_ADD_RANDOM |
1532 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, zv->zv_queue); | |
1533 | #endif | |
34037afe | 1534 | |
a4430fce GW |
1535 | if (spa_writeable(dmu_objset_spa(os))) { |
1536 | if (zil_replay_disable) | |
1537 | zil_destroy(dmu_objset_zil(os), B_FALSE); | |
1538 | else | |
1539 | zil_replay(os, zv, zvol_replay_vector); | |
1540 | } | |
60101509 | 1541 | |
9965059a BB |
1542 | /* |
1543 | * When udev detects the addition of the device it will immediately | |
1544 | * invoke blkid(8) to determine the type of content on the device. | |
1545 | * Prefetching the blocks commonly scanned by blkid(8) will speed | |
1546 | * up this process. | |
1547 | */ | |
1548 | len = MIN(MAX(zvol_prefetch_bytes, 0), SPA_MAXBLOCKSIZE); | |
1549 | if (len > 0) { | |
fcff0f35 PD |
1550 | dmu_prefetch(os, ZVOL_OBJ, 0, 0, len, ZIO_PRIORITY_SYNC_READ); |
1551 | dmu_prefetch(os, ZVOL_OBJ, 0, volsize - len, len, | |
02730c33 | 1552 | ZIO_PRIORITY_SYNC_READ); |
9965059a BB |
1553 | } |
1554 | ||
f74a147c | 1555 | zv->zv_objset = NULL; |
60101509 | 1556 | out_dmu_objset_disown: |
040dab99 | 1557 | dmu_objset_disown(os, FTAG); |
60101509 | 1558 | out_doi: |
ce37ebd2 | 1559 | kmem_free(doi, sizeof (dmu_object_info_t)); |
60101509 BB |
1560 | out: |
1561 | ||
1562 | if (error == 0) { | |
1563 | zvol_insert(zv); | |
5428dc51 BP |
1564 | /* |
1565 | * Drop the lock to prevent deadlock with sys_open() -> | |
1566 | * zvol_open(), which first takes bd_disk->bd_mutex and then | |
1567 | * takes zvol_state_lock, whereas this code path first takes | |
1568 | * zvol_state_lock, and then takes bd_disk->bd_mutex. | |
1569 | */ | |
1570 | mutex_exit(&zvol_state_lock); | |
60101509 | 1571 | add_disk(zv->zv_disk); |
a0bd735a BP |
1572 | } else { |
1573 | mutex_exit(&zvol_state_lock); | |
d45e010d | 1574 | ida_simple_remove(&zvol_ida, idx); |
60101509 BB |
1575 | } |
1576 | ||
ce37ebd2 | 1577 | return (SET_ERROR(error)); |
60101509 BB |
1578 | } |
1579 | ||
ba6a2402 BB |
1580 | /* |
1581 | * Rename a block device minor mode for the specified volume. | |
1582 | */ | |
1583 | static void | |
a0bd735a | 1584 | zvol_rename_minor(zvol_state_t *zv, const char *newname) |
ba6a2402 BB |
1585 | { |
1586 | int readonly = get_disk_ro(zv->zv_disk); | |
1587 | ||
1588 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
1589 | ||
040dab99 | 1590 | rw_enter(&zv->zv_suspend_lock, RW_READER); |
ba6a2402 | 1591 | strlcpy(zv->zv_name, newname, sizeof (zv->zv_name)); |
040dab99 CC |
1592 | rw_exit(&zv->zv_suspend_lock); |
1593 | ||
1594 | /* move to new hashtable entry */ | |
1595 | zv->zv_hash = zvol_name_hash(zv->zv_name); | |
1596 | hlist_del(&zv->zv_hlink); | |
1597 | hlist_add_head(&zv->zv_hlink, ZVOL_HT_HEAD(zv->zv_hash)); | |
ba6a2402 BB |
1598 | |
1599 | /* | |
1600 | * The block device's read-only state is briefly changed causing | |
1601 | * a KOBJ_CHANGE uevent to be issued. This ensures udev detects | |
1602 | * the name change and fixes the symlinks. This does not change | |
1603 | * ZVOL_RDONLY in zv->zv_flags so the actual read-only state never | |
1604 | * changes. This would normally be done using kobject_uevent() but | |
1605 | * that is a GPL-only symbol which is why we need this workaround. | |
1606 | */ | |
1607 | set_disk_ro(zv->zv_disk, !readonly); | |
1608 | set_disk_ro(zv->zv_disk, readonly); | |
1609 | } | |
1610 | ||
7ac557ce CC |
1611 | typedef struct minors_job { |
1612 | list_t *list; | |
1613 | list_node_t link; | |
1614 | /* input */ | |
1615 | char *name; | |
1616 | /* output */ | |
1617 | int error; | |
1618 | } minors_job_t; | |
1619 | ||
1620 | /* | |
1621 | * Prefetch zvol dnodes for the minors_job | |
1622 | */ | |
1623 | static void | |
1624 | zvol_prefetch_minors_impl(void *arg) | |
1625 | { | |
1626 | minors_job_t *job = arg; | |
1627 | char *dsname = job->name; | |
1628 | objset_t *os = NULL; | |
1629 | ||
040dab99 | 1630 | job->error = dmu_objset_own(dsname, DMU_OST_ZVOL, B_TRUE, FTAG, |
7ac557ce CC |
1631 | &os); |
1632 | if (job->error == 0) { | |
1633 | dmu_prefetch(os, ZVOL_OBJ, 0, 0, 0, ZIO_PRIORITY_SYNC_READ); | |
040dab99 | 1634 | dmu_objset_disown(os, FTAG); |
7ac557ce CC |
1635 | } |
1636 | } | |
a0bd735a BP |
1637 | |
1638 | /* | |
1639 | * Mask errors to continue dmu_objset_find() traversal | |
1640 | */ | |
1641 | static int | |
1642 | zvol_create_snap_minor_cb(const char *dsname, void *arg) | |
1643 | { | |
7ac557ce CC |
1644 | minors_job_t *j = arg; |
1645 | list_t *minors_list = j->list; | |
1646 | const char *name = j->name; | |
a0bd735a | 1647 | |
1ee159f4 BP |
1648 | ASSERT0(MUTEX_HELD(&spa_namespace_lock)); |
1649 | ||
a0bd735a BP |
1650 | /* skip the designated dataset */ |
1651 | if (name && strcmp(dsname, name) == 0) | |
1652 | return (0); | |
1653 | ||
1654 | /* at this point, the dsname should name a snapshot */ | |
1655 | if (strchr(dsname, '@') == 0) { | |
1656 | dprintf("zvol_create_snap_minor_cb(): " | |
02730c33 | 1657 | "%s is not a shapshot name\n", dsname); |
a0bd735a | 1658 | } else { |
7ac557ce CC |
1659 | minors_job_t *job; |
1660 | char *n = strdup(dsname); | |
1661 | if (n == NULL) | |
1662 | return (0); | |
1663 | ||
1664 | job = kmem_alloc(sizeof (minors_job_t), KM_SLEEP); | |
1665 | job->name = n; | |
1666 | job->list = minors_list; | |
1667 | job->error = 0; | |
1668 | list_insert_tail(minors_list, job); | |
1669 | /* don't care if dispatch fails, because job->error is 0 */ | |
1670 | taskq_dispatch(system_taskq, zvol_prefetch_minors_impl, job, | |
1671 | TQ_SLEEP); | |
a0bd735a BP |
1672 | } |
1673 | ||
1674 | return (0); | |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | * Mask errors to continue dmu_objset_find() traversal | |
1679 | */ | |
60101509 | 1680 | static int |
13fe0198 | 1681 | zvol_create_minors_cb(const char *dsname, void *arg) |
60101509 | 1682 | { |
a0bd735a BP |
1683 | uint64_t snapdev; |
1684 | int error; | |
7ac557ce | 1685 | list_t *minors_list = arg; |
a0bd735a | 1686 | |
1ee159f4 BP |
1687 | ASSERT0(MUTEX_HELD(&spa_namespace_lock)); |
1688 | ||
a0bd735a BP |
1689 | error = dsl_prop_get_integer(dsname, "snapdev", &snapdev, NULL); |
1690 | if (error) | |
1691 | return (0); | |
1692 | ||
1693 | /* | |
1694 | * Given the name and the 'snapdev' property, create device minor nodes | |
1695 | * with the linkages to zvols/snapshots as needed. | |
1696 | * If the name represents a zvol, create a minor node for the zvol, then | |
1697 | * check if its snapshots are 'visible', and if so, iterate over the | |
1698 | * snapshots and create device minor nodes for those. | |
1699 | */ | |
1700 | if (strchr(dsname, '@') == 0) { | |
7ac557ce CC |
1701 | minors_job_t *job; |
1702 | char *n = strdup(dsname); | |
1703 | if (n == NULL) | |
1704 | return (0); | |
1705 | ||
1706 | job = kmem_alloc(sizeof (minors_job_t), KM_SLEEP); | |
1707 | job->name = n; | |
1708 | job->list = minors_list; | |
1709 | job->error = 0; | |
1710 | list_insert_tail(minors_list, job); | |
1711 | /* don't care if dispatch fails, because job->error is 0 */ | |
1712 | taskq_dispatch(system_taskq, zvol_prefetch_minors_impl, job, | |
1713 | TQ_SLEEP); | |
1714 | ||
1715 | if (snapdev == ZFS_SNAPDEV_VISIBLE) { | |
a0bd735a BP |
1716 | /* |
1717 | * traverse snapshots only, do not traverse children, | |
1718 | * and skip the 'dsname' | |
1719 | */ | |
1720 | error = dmu_objset_find((char *)dsname, | |
7ac557ce | 1721 | zvol_create_snap_minor_cb, (void *)job, |
a0bd735a | 1722 | DS_FIND_SNAPSHOTS); |
a0bd735a BP |
1723 | } |
1724 | } else { | |
1725 | dprintf("zvol_create_minors_cb(): %s is not a zvol name\n", | |
02730c33 | 1726 | dsname); |
a0bd735a | 1727 | } |
60101509 | 1728 | |
d5674448 | 1729 | return (0); |
60101509 BB |
1730 | } |
1731 | ||
1732 | /* | |
a0bd735a BP |
1733 | * Create minors for the specified dataset, including children and snapshots. |
1734 | * Pay attention to the 'snapdev' property and iterate over the snapshots | |
1735 | * only if they are 'visible'. This approach allows one to assure that the | |
1736 | * snapshot metadata is read from disk only if it is needed. | |
1737 | * | |
1738 | * The name can represent a dataset to be recursively scanned for zvols and | |
1739 | * their snapshots, or a single zvol snapshot. If the name represents a | |
1740 | * dataset, the scan is performed in two nested stages: | |
1741 | * - scan the dataset for zvols, and | |
1742 | * - for each zvol, create a minor node, then check if the zvol's snapshots | |
1743 | * are 'visible', and only then iterate over the snapshots if needed | |
1744 | * | |
4e33ba4c | 1745 | * If the name represents a snapshot, a check is performed if the snapshot is |
a0bd735a BP |
1746 | * 'visible' (which also verifies that the parent is a zvol), and if so, |
1747 | * a minor node for that snapshot is created. | |
60101509 | 1748 | */ |
a0bd735a BP |
1749 | static int |
1750 | zvol_create_minors_impl(const char *name) | |
60101509 | 1751 | { |
60101509 | 1752 | int error = 0; |
5428dc51 | 1753 | fstrans_cookie_t cookie; |
a0bd735a | 1754 | char *atp, *parent; |
7ac557ce CC |
1755 | list_t minors_list; |
1756 | minors_job_t *job; | |
60101509 | 1757 | |
5428dc51 BP |
1758 | if (zvol_inhibit_dev) |
1759 | return (0); | |
1760 | ||
7ac557ce CC |
1761 | /* |
1762 | * This is the list for prefetch jobs. Whenever we found a match | |
1763 | * during dmu_objset_find, we insert a minors_job to the list and do | |
1764 | * taskq_dispatch to parallel prefetch zvol dnodes. Note we don't need | |
1765 | * any lock because all list operation is done on the current thread. | |
1766 | * | |
1767 | * We will use this list to do zvol_create_minor_impl after prefetch | |
1768 | * so we don't have to traverse using dmu_objset_find again. | |
1769 | */ | |
1770 | list_create(&minors_list, sizeof (minors_job_t), | |
1771 | offsetof(minors_job_t, link)); | |
1772 | ||
a0bd735a BP |
1773 | parent = kmem_alloc(MAXPATHLEN, KM_SLEEP); |
1774 | (void) strlcpy(parent, name, MAXPATHLEN); | |
1775 | ||
1776 | if ((atp = strrchr(parent, '@')) != NULL) { | |
1777 | uint64_t snapdev; | |
1778 | ||
1779 | *atp = '\0'; | |
1780 | error = dsl_prop_get_integer(parent, "snapdev", | |
1781 | &snapdev, NULL); | |
1782 | ||
1783 | if (error == 0 && snapdev == ZFS_SNAPDEV_VISIBLE) | |
1784 | error = zvol_create_minor_impl(name); | |
1785 | } else { | |
1786 | cookie = spl_fstrans_mark(); | |
1787 | error = dmu_objset_find(parent, zvol_create_minors_cb, | |
7ac557ce | 1788 | &minors_list, DS_FIND_CHILDREN); |
a0bd735a BP |
1789 | spl_fstrans_unmark(cookie); |
1790 | } | |
1791 | ||
1792 | kmem_free(parent, MAXPATHLEN); | |
7ac557ce CC |
1793 | taskq_wait_outstanding(system_taskq, 0); |
1794 | ||
1795 | /* | |
1796 | * Prefetch is completed, we can do zvol_create_minor_impl | |
1797 | * sequentially. | |
1798 | */ | |
1799 | while ((job = list_head(&minors_list)) != NULL) { | |
1800 | list_remove(&minors_list, job); | |
1801 | if (!job->error) | |
1802 | zvol_create_minor_impl(job->name); | |
1803 | strfree(job->name); | |
1804 | kmem_free(job, sizeof (minors_job_t)); | |
1805 | } | |
1806 | ||
1807 | list_destroy(&minors_list); | |
ba6a2402 BB |
1808 | |
1809 | return (SET_ERROR(error)); | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * Remove minors for specified dataset including children and snapshots. | |
1814 | */ | |
a0bd735a BP |
1815 | static void |
1816 | zvol_remove_minors_impl(const char *name) | |
ba6a2402 BB |
1817 | { |
1818 | zvol_state_t *zv, *zv_next; | |
1819 | int namelen = ((name) ? strlen(name) : 0); | |
899662e3 | 1820 | taskqid_t t, tid = TASKQID_INVALID; |
ba6a2402 | 1821 | |
74497b7a | 1822 | if (zvol_inhibit_dev) |
ba6a2402 | 1823 | return; |
74497b7a | 1824 | |
60101509 | 1825 | mutex_enter(&zvol_state_lock); |
ba6a2402 BB |
1826 | |
1827 | for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { | |
1828 | zv_next = list_next(&zvol_state_list, zv); | |
1829 | ||
1830 | if (name == NULL || strcmp(zv->zv_name, name) == 0 || | |
1831 | (strncmp(zv->zv_name, name, namelen) == 0 && | |
5428dc51 BP |
1832 | (zv->zv_name[namelen] == '/' || |
1833 | zv->zv_name[namelen] == '@'))) { | |
1834 | ||
1835 | /* If in use, leave alone */ | |
040dab99 CC |
1836 | if (zv->zv_open_count > 0 || |
1837 | atomic_read(&zv->zv_suspend_ref)) | |
5428dc51 BP |
1838 | continue; |
1839 | ||
ba6a2402 | 1840 | zvol_remove(zv); |
899662e3 CC |
1841 | |
1842 | /* clear this so zvol_open won't open it */ | |
1843 | zv->zv_disk->private_data = NULL; | |
1844 | ||
1845 | /* try parallel zv_free, if failed do it in place */ | |
1846 | t = taskq_dispatch(system_taskq, zvol_free_impl, zv, | |
1847 | TQ_SLEEP); | |
1848 | if (t == TASKQID_INVALID) | |
1849 | zvol_free(zv); | |
1850 | else | |
1851 | tid = t; | |
60101509 | 1852 | } |
60101509 | 1853 | } |
ba6a2402 | 1854 | mutex_exit(&zvol_state_lock); |
899662e3 CC |
1855 | if (tid != TASKQID_INVALID) |
1856 | taskq_wait_outstanding(system_taskq, tid); | |
60101509 BB |
1857 | } |
1858 | ||
a0bd735a BP |
1859 | /* Remove minor for this specific snapshot only */ |
1860 | static void | |
1861 | zvol_remove_minor_impl(const char *name) | |
1862 | { | |
1863 | zvol_state_t *zv, *zv_next; | |
1864 | ||
1865 | if (zvol_inhibit_dev) | |
1866 | return; | |
1867 | ||
1868 | if (strchr(name, '@') == NULL) | |
1869 | return; | |
1870 | ||
1871 | mutex_enter(&zvol_state_lock); | |
1872 | ||
1873 | for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { | |
1874 | zv_next = list_next(&zvol_state_list, zv); | |
1875 | ||
1876 | if (strcmp(zv->zv_name, name) == 0) { | |
1877 | /* If in use, leave alone */ | |
040dab99 CC |
1878 | if (zv->zv_open_count > 0 || |
1879 | atomic_read(&zv->zv_suspend_ref)) | |
a0bd735a BP |
1880 | continue; |
1881 | zvol_remove(zv); | |
1882 | zvol_free(zv); | |
1883 | break; | |
1884 | } | |
1885 | } | |
1886 | ||
1887 | mutex_exit(&zvol_state_lock); | |
1888 | } | |
1889 | ||
60101509 | 1890 | /* |
ba6a2402 | 1891 | * Rename minors for specified dataset including children and snapshots. |
60101509 | 1892 | */ |
a0bd735a BP |
1893 | static void |
1894 | zvol_rename_minors_impl(const char *oldname, const char *newname) | |
60101509 BB |
1895 | { |
1896 | zvol_state_t *zv, *zv_next; | |
ba6a2402 BB |
1897 | int oldnamelen, newnamelen; |
1898 | char *name; | |
60101509 | 1899 | |
74497b7a DH |
1900 | if (zvol_inhibit_dev) |
1901 | return; | |
1902 | ||
ba6a2402 BB |
1903 | oldnamelen = strlen(oldname); |
1904 | newnamelen = strlen(newname); | |
79c76d5b | 1905 | name = kmem_alloc(MAXNAMELEN, KM_SLEEP); |
60101509 BB |
1906 | |
1907 | mutex_enter(&zvol_state_lock); | |
ba6a2402 | 1908 | |
60101509 BB |
1909 | for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { |
1910 | zv_next = list_next(&zvol_state_list, zv); | |
1911 | ||
5428dc51 BP |
1912 | /* If in use, leave alone */ |
1913 | if (zv->zv_open_count > 0) | |
1914 | continue; | |
1915 | ||
ba6a2402 | 1916 | if (strcmp(zv->zv_name, oldname) == 0) { |
a0bd735a | 1917 | zvol_rename_minor(zv, newname); |
ba6a2402 BB |
1918 | } else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 && |
1919 | (zv->zv_name[oldnamelen] == '/' || | |
1920 | zv->zv_name[oldnamelen] == '@')) { | |
1921 | snprintf(name, MAXNAMELEN, "%s%c%s", newname, | |
1922 | zv->zv_name[oldnamelen], | |
1923 | zv->zv_name + oldnamelen + 1); | |
a0bd735a | 1924 | zvol_rename_minor(zv, name); |
60101509 BB |
1925 | } |
1926 | } | |
ba6a2402 | 1927 | |
60101509 | 1928 | mutex_exit(&zvol_state_lock); |
ba6a2402 BB |
1929 | |
1930 | kmem_free(name, MAXNAMELEN); | |
60101509 BB |
1931 | } |
1932 | ||
a0bd735a BP |
1933 | typedef struct zvol_snapdev_cb_arg { |
1934 | uint64_t snapdev; | |
1935 | } zvol_snapdev_cb_arg_t; | |
1936 | ||
0b4d1b58 | 1937 | static int |
4ea3f864 GM |
1938 | zvol_set_snapdev_cb(const char *dsname, void *param) |
1939 | { | |
a0bd735a | 1940 | zvol_snapdev_cb_arg_t *arg = param; |
0b4d1b58 ED |
1941 | |
1942 | if (strchr(dsname, '@') == NULL) | |
ba6a2402 | 1943 | return (0); |
0b4d1b58 | 1944 | |
a0bd735a | 1945 | switch (arg->snapdev) { |
0b4d1b58 | 1946 | case ZFS_SNAPDEV_VISIBLE: |
a0bd735a | 1947 | (void) zvol_create_minor_impl(dsname); |
0b4d1b58 ED |
1948 | break; |
1949 | case ZFS_SNAPDEV_HIDDEN: | |
a0bd735a | 1950 | (void) zvol_remove_minor_impl(dsname); |
0b4d1b58 ED |
1951 | break; |
1952 | } | |
ba6a2402 BB |
1953 | |
1954 | return (0); | |
0b4d1b58 ED |
1955 | } |
1956 | ||
a0bd735a BP |
1957 | static void |
1958 | zvol_set_snapdev_impl(char *name, uint64_t snapdev) | |
1959 | { | |
1960 | zvol_snapdev_cb_arg_t arg = {snapdev}; | |
1961 | fstrans_cookie_t cookie = spl_fstrans_mark(); | |
1962 | /* | |
1963 | * The zvol_set_snapdev_sync() sets snapdev appropriately | |
1964 | * in the dataset hierarchy. Here, we only scan snapshots. | |
1965 | */ | |
1966 | dmu_objset_find(name, zvol_set_snapdev_cb, &arg, DS_FIND_SNAPSHOTS); | |
1967 | spl_fstrans_unmark(cookie); | |
1968 | } | |
1969 | ||
1970 | static zvol_task_t * | |
1971 | zvol_task_alloc(zvol_async_op_t op, const char *name1, const char *name2, | |
1972 | uint64_t snapdev) | |
1973 | { | |
1974 | zvol_task_t *task; | |
1975 | char *delim; | |
1976 | ||
1977 | /* Never allow tasks on hidden names. */ | |
1978 | if (name1[0] == '$') | |
1979 | return (NULL); | |
1980 | ||
1981 | task = kmem_zalloc(sizeof (zvol_task_t), KM_SLEEP); | |
1982 | task->op = op; | |
1983 | task->snapdev = snapdev; | |
1984 | delim = strchr(name1, '/'); | |
1985 | strlcpy(task->pool, name1, delim ? (delim - name1 + 1) : MAXNAMELEN); | |
1986 | ||
1987 | strlcpy(task->name1, name1, MAXNAMELEN); | |
1988 | if (name2 != NULL) | |
1989 | strlcpy(task->name2, name2, MAXNAMELEN); | |
1990 | ||
1991 | return (task); | |
1992 | } | |
1993 | ||
1994 | static void | |
1995 | zvol_task_free(zvol_task_t *task) | |
1996 | { | |
1997 | kmem_free(task, sizeof (zvol_task_t)); | |
1998 | } | |
1999 | ||
2000 | /* | |
2001 | * The worker thread function performed asynchronously. | |
2002 | */ | |
2003 | static void | |
2004 | zvol_task_cb(void *param) | |
2005 | { | |
2006 | zvol_task_t *task = (zvol_task_t *)param; | |
2007 | ||
2008 | switch (task->op) { | |
2009 | case ZVOL_ASYNC_CREATE_MINORS: | |
2010 | (void) zvol_create_minors_impl(task->name1); | |
2011 | break; | |
2012 | case ZVOL_ASYNC_REMOVE_MINORS: | |
2013 | zvol_remove_minors_impl(task->name1); | |
2014 | break; | |
2015 | case ZVOL_ASYNC_RENAME_MINORS: | |
2016 | zvol_rename_minors_impl(task->name1, task->name2); | |
2017 | break; | |
2018 | case ZVOL_ASYNC_SET_SNAPDEV: | |
2019 | zvol_set_snapdev_impl(task->name1, task->snapdev); | |
2020 | break; | |
2021 | default: | |
2022 | VERIFY(0); | |
2023 | break; | |
2024 | } | |
2025 | ||
2026 | zvol_task_free(task); | |
2027 | } | |
2028 | ||
2029 | typedef struct zvol_set_snapdev_arg { | |
2030 | const char *zsda_name; | |
2031 | uint64_t zsda_value; | |
2032 | zprop_source_t zsda_source; | |
2033 | dmu_tx_t *zsda_tx; | |
2034 | } zvol_set_snapdev_arg_t; | |
2035 | ||
2036 | /* | |
2037 | * Sanity check the dataset for safe use by the sync task. No additional | |
2038 | * conditions are imposed. | |
2039 | */ | |
2040 | static int | |
2041 | zvol_set_snapdev_check(void *arg, dmu_tx_t *tx) | |
2042 | { | |
2043 | zvol_set_snapdev_arg_t *zsda = arg; | |
2044 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
2045 | dsl_dir_t *dd; | |
2046 | int error; | |
2047 | ||
2048 | error = dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL); | |
2049 | if (error != 0) | |
2050 | return (error); | |
2051 | ||
2052 | dsl_dir_rele(dd, FTAG); | |
2053 | ||
2054 | return (error); | |
2055 | } | |
2056 | ||
2057 | static int | |
2058 | zvol_set_snapdev_sync_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) | |
2059 | { | |
2060 | zvol_set_snapdev_arg_t *zsda = arg; | |
2061 | char dsname[MAXNAMELEN]; | |
2062 | zvol_task_t *task; | |
2063 | ||
2064 | dsl_dataset_name(ds, dsname); | |
2065 | dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_SNAPDEV), | |
2066 | zsda->zsda_source, sizeof (zsda->zsda_value), 1, | |
2067 | &zsda->zsda_value, zsda->zsda_tx); | |
2068 | ||
2069 | task = zvol_task_alloc(ZVOL_ASYNC_SET_SNAPDEV, dsname, | |
2070 | NULL, zsda->zsda_value); | |
2071 | if (task == NULL) | |
2072 | return (0); | |
2073 | ||
2074 | (void) taskq_dispatch(dp->dp_spa->spa_zvol_taskq, zvol_task_cb, | |
02730c33 | 2075 | task, TQ_SLEEP); |
a0bd735a BP |
2076 | return (0); |
2077 | } | |
2078 | ||
2079 | /* | |
2080 | * Traverse all child snapshot datasets and apply snapdev appropriately. | |
2081 | */ | |
2082 | static void | |
2083 | zvol_set_snapdev_sync(void *arg, dmu_tx_t *tx) | |
2084 | { | |
2085 | zvol_set_snapdev_arg_t *zsda = arg; | |
2086 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
2087 | dsl_dir_t *dd; | |
2088 | ||
2089 | VERIFY0(dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL)); | |
2090 | zsda->zsda_tx = tx; | |
2091 | ||
2092 | dmu_objset_find_dp(dp, dd->dd_object, zvol_set_snapdev_sync_cb, | |
2093 | zsda, DS_FIND_CHILDREN); | |
2094 | ||
2095 | dsl_dir_rele(dd, FTAG); | |
2096 | } | |
2097 | ||
0b4d1b58 | 2098 | int |
a0bd735a BP |
2099 | zvol_set_snapdev(const char *ddname, zprop_source_t source, uint64_t snapdev) |
2100 | { | |
2101 | zvol_set_snapdev_arg_t zsda; | |
5428dc51 | 2102 | |
a0bd735a BP |
2103 | zsda.zsda_name = ddname; |
2104 | zsda.zsda_source = source; | |
2105 | zsda.zsda_value = snapdev; | |
5428dc51 | 2106 | |
a0bd735a BP |
2107 | return (dsl_sync_task(ddname, zvol_set_snapdev_check, |
2108 | zvol_set_snapdev_sync, &zsda, 0, ZFS_SPACE_CHECK_NONE)); | |
2109 | } | |
2110 | ||
2111 | void | |
2112 | zvol_create_minors(spa_t *spa, const char *name, boolean_t async) | |
2113 | { | |
2114 | zvol_task_t *task; | |
2115 | taskqid_t id; | |
2116 | ||
2117 | task = zvol_task_alloc(ZVOL_ASYNC_CREATE_MINORS, name, NULL, ~0ULL); | |
2118 | if (task == NULL) | |
2119 | return; | |
2120 | ||
2121 | id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP); | |
48d3eb40 | 2122 | if ((async == B_FALSE) && (id != TASKQID_INVALID)) |
a0bd735a BP |
2123 | taskq_wait_id(spa->spa_zvol_taskq, id); |
2124 | } | |
2125 | ||
2126 | void | |
2127 | zvol_remove_minors(spa_t *spa, const char *name, boolean_t async) | |
2128 | { | |
2129 | zvol_task_t *task; | |
2130 | taskqid_t id; | |
2131 | ||
2132 | task = zvol_task_alloc(ZVOL_ASYNC_REMOVE_MINORS, name, NULL, ~0ULL); | |
2133 | if (task == NULL) | |
2134 | return; | |
5428dc51 | 2135 | |
a0bd735a | 2136 | id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP); |
48d3eb40 | 2137 | if ((async == B_FALSE) && (id != TASKQID_INVALID)) |
a0bd735a BP |
2138 | taskq_wait_id(spa->spa_zvol_taskq, id); |
2139 | } | |
2140 | ||
2141 | void | |
2142 | zvol_rename_minors(spa_t *spa, const char *name1, const char *name2, | |
2143 | boolean_t async) | |
2144 | { | |
2145 | zvol_task_t *task; | |
2146 | taskqid_t id; | |
2147 | ||
2148 | task = zvol_task_alloc(ZVOL_ASYNC_RENAME_MINORS, name1, name2, ~0ULL); | |
2149 | if (task == NULL) | |
2150 | return; | |
2151 | ||
2152 | id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP); | |
48d3eb40 | 2153 | if ((async == B_FALSE) && (id != TASKQID_INVALID)) |
a0bd735a | 2154 | taskq_wait_id(spa->spa_zvol_taskq, id); |
0b4d1b58 ED |
2155 | } |
2156 | ||
60101509 BB |
2157 | int |
2158 | zvol_init(void) | |
2159 | { | |
d45e010d | 2160 | int i, error; |
60101509 | 2161 | |
2a3871d4 | 2162 | list_create(&zvol_state_list, sizeof (zvol_state_t), |
ce37ebd2 | 2163 | offsetof(zvol_state_t, zv_next)); |
2a3871d4 | 2164 | mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); |
4a5d7f82 | 2165 | ida_init(&zvol_ida); |
2a3871d4 | 2166 | |
d45e010d CC |
2167 | zvol_htable = kmem_alloc(ZVOL_HT_SIZE * sizeof (struct hlist_head), |
2168 | KM_SLEEP); | |
2169 | if (!zvol_htable) { | |
2170 | error = ENOMEM; | |
2171 | goto out; | |
2172 | } | |
2173 | for (i = 0; i < ZVOL_HT_SIZE; i++) | |
2174 | INIT_HLIST_HEAD(&zvol_htable[i]); | |
2175 | ||
60101509 BB |
2176 | error = register_blkdev(zvol_major, ZVOL_DRIVER); |
2177 | if (error) { | |
2178 | printk(KERN_INFO "ZFS: register_blkdev() failed %d\n", error); | |
d45e010d | 2179 | goto out_free; |
60101509 BB |
2180 | } |
2181 | ||
2182 | blk_register_region(MKDEV(zvol_major, 0), 1UL << MINORBITS, | |
ce37ebd2 | 2183 | THIS_MODULE, zvol_probe, NULL, NULL); |
60101509 | 2184 | |
60101509 | 2185 | return (0); |
2a3871d4 | 2186 | |
d45e010d CC |
2187 | out_free: |
2188 | kmem_free(zvol_htable, ZVOL_HT_SIZE * sizeof (struct hlist_head)); | |
37f9dac5 | 2189 | out: |
2a3871d4 RY |
2190 | mutex_destroy(&zvol_state_lock); |
2191 | list_destroy(&zvol_state_list); | |
2192 | ||
ce37ebd2 | 2193 | return (SET_ERROR(error)); |
60101509 BB |
2194 | } |
2195 | ||
2196 | void | |
2197 | zvol_fini(void) | |
2198 | { | |
a0bd735a BP |
2199 | zvol_remove_minors_impl(NULL); |
2200 | ||
60101509 BB |
2201 | blk_unregister_region(MKDEV(zvol_major, 0), 1UL << MINORBITS); |
2202 | unregister_blkdev(zvol_major, ZVOL_DRIVER); | |
d45e010d | 2203 | kmem_free(zvol_htable, ZVOL_HT_SIZE * sizeof (struct hlist_head)); |
a0bd735a | 2204 | |
60101509 | 2205 | list_destroy(&zvol_state_list); |
a0bd735a | 2206 | mutex_destroy(&zvol_state_lock); |
f2d8bdc6 CC |
2207 | |
2208 | ida_destroy(&zvol_ida); | |
60101509 BB |
2209 | } |
2210 | ||
02730c33 | 2211 | /* BEGIN CSTYLED */ |
74497b7a DH |
2212 | module_param(zvol_inhibit_dev, uint, 0644); |
2213 | MODULE_PARM_DESC(zvol_inhibit_dev, "Do not create zvol device nodes"); | |
2214 | ||
30a9524e | 2215 | module_param(zvol_major, uint, 0444); |
60101509 BB |
2216 | MODULE_PARM_DESC(zvol_major, "Major number for zvol device"); |
2217 | ||
7c0e5708 | 2218 | module_param(zvol_max_discard_blocks, ulong, 0444); |
ce37ebd2 | 2219 | MODULE_PARM_DESC(zvol_max_discard_blocks, "Max number of blocks to discard"); |
9965059a BB |
2220 | |
2221 | module_param(zvol_prefetch_bytes, uint, 0644); | |
2222 | MODULE_PARM_DESC(zvol_prefetch_bytes, "Prefetch N bytes at zvol start+end"); | |
02730c33 | 2223 | /* END CSTYLED */ |