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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. |
a448a255 | 39 | * Copyright (c) 2012, 2018 by Delphix. All rights reserved. |
60101509 BB |
40 | */ |
41 | ||
5559ba09 BP |
42 | /* |
43 | * Note on locking of zvol state structures. | |
44 | * | |
45 | * These structures are used to maintain internal state used to emulate block | |
46 | * devices on top of zvols. In particular, management of device minor number | |
47 | * operations - create, remove, rename, and set_snapdev - involves access to | |
48 | * these structures. The zvol_state_lock is primarily used to protect the | |
49 | * zvol_state_list. The zv->zv_state_lock is used to protect the contents | |
50 | * of the zvol_state_t structures, as well as to make sure that when the | |
51 | * time comes to remove the structure from the list, it is not in use, and | |
52 | * therefore, it can be taken off zvol_state_list and freed. | |
53 | * | |
58404a73 BP |
54 | * The zv_suspend_lock was introduced to allow for suspending I/O to a zvol, |
55 | * e.g. for the duration of receive and rollback operations. This lock can be | |
56 | * held for significant periods of time. Given that it is undesirable to hold | |
57 | * mutexes for long periods of time, the following lock ordering applies: | |
58 | * - take zvol_state_lock if necessary, to protect zvol_state_list | |
59 | * - take zv_suspend_lock if necessary, by the code path in question | |
60 | * - take zv_state_lock to protect zvol_state_t | |
61 | * | |
62 | * The minor operations are issued to spa->spa_zvol_taskq queues, that are | |
5559ba09 BP |
63 | * single-threaded (to preserve order of minor operations), and are executed |
64 | * through the zvol_task_cb that dispatches the specific operations. Therefore, | |
65 | * these operations are serialized per pool. Consequently, we can be certain | |
66 | * that for a given zvol, there is only one operation at a time in progress. | |
67 | * That is why one can be sure that first, zvol_state_t for a given zvol is | |
68 | * allocated and placed on zvol_state_list, and then other minor operations | |
69 | * for this zvol are going to proceed in the order of issue. | |
70 | * | |
71 | * It is also worth keeping in mind that once add_disk() is called, the zvol is | |
72 | * announced to the world, and zvol_open()/zvol_release() can be called at any | |
73 | * time. Incidentally, add_disk() itself calls zvol_open()->zvol_first_open() | |
74 | * and zvol_release()->zvol_last_close() directly as well. | |
75 | */ | |
76 | ||
a448a255 | 77 | #include <sys/dataset_kstats.h> |
03c6040b | 78 | #include <sys/dbuf.h> |
60101509 BB |
79 | #include <sys/dmu_traverse.h> |
80 | #include <sys/dsl_dataset.h> | |
81 | #include <sys/dsl_prop.h> | |
a0bd735a | 82 | #include <sys/dsl_dir.h> |
60101509 | 83 | #include <sys/zap.h> |
4cb7b9c5 | 84 | #include <sys/zfeature.h> |
60101509 | 85 | #include <sys/zil_impl.h> |
460a0213 | 86 | #include <sys/dmu_tx.h> |
60101509 BB |
87 | #include <sys/zio.h> |
88 | #include <sys/zfs_rlock.h> | |
a0bd735a | 89 | #include <sys/spa_impl.h> |
60101509 | 90 | #include <sys/zvol.h> |
a448a255 | 91 | |
61e90960 | 92 | #include <linux/blkdev_compat.h> |
a448a255 | 93 | #include <linux/task_io_accounting_ops.h> |
60101509 | 94 | |
74497b7a | 95 | unsigned int zvol_inhibit_dev = 0; |
60101509 | 96 | unsigned int zvol_major = ZVOL_MAJOR; |
692e55b8 | 97 | unsigned int zvol_threads = 32; |
8fa5250f | 98 | unsigned int zvol_request_sync = 0; |
9965059a | 99 | unsigned int zvol_prefetch_bytes = (128 * 1024); |
7c0e5708 | 100 | unsigned long zvol_max_discard_blocks = 16384; |
cf8738d8 | 101 | unsigned int zvol_volmode = ZFS_VOLMODE_GEOM; |
60101509 | 102 | |
692e55b8 | 103 | static taskq_t *zvol_taskq; |
7b98f0d9 | 104 | static krwlock_t zvol_state_lock; |
60101509 | 105 | static list_t zvol_state_list; |
60101509 | 106 | |
d45e010d CC |
107 | #define ZVOL_HT_SIZE 1024 |
108 | static struct hlist_head *zvol_htable; | |
109 | #define ZVOL_HT_HEAD(hash) (&zvol_htable[(hash) & (ZVOL_HT_SIZE-1)]) | |
4a5d7f82 MA |
110 | |
111 | static struct ida zvol_ida; | |
d45e010d | 112 | |
60101509 BB |
113 | /* |
114 | * The in-core state of each volume. | |
115 | */ | |
040dab99 | 116 | struct zvol_state { |
4c0d8e50 | 117 | char zv_name[MAXNAMELEN]; /* name */ |
ce37ebd2 BB |
118 | uint64_t zv_volsize; /* advertised space */ |
119 | uint64_t zv_volblocksize; /* volume block size */ | |
60101509 BB |
120 | objset_t *zv_objset; /* objset handle */ |
121 | uint32_t zv_flags; /* ZVOL_* flags */ | |
122 | uint32_t zv_open_count; /* open counts */ | |
123 | uint32_t zv_changed; /* disk changed */ | |
124 | zilog_t *zv_zilog; /* ZIL handle */ | |
5d43cc9a | 125 | rangelock_t zv_rangelock; /* for range locking */ |
5228cf01 | 126 | dnode_t *zv_dn; /* dnode hold */ |
60101509 BB |
127 | dev_t zv_dev; /* device id */ |
128 | struct gendisk *zv_disk; /* generic disk */ | |
129 | struct request_queue *zv_queue; /* request queue */ | |
a448a255 | 130 | dataset_kstats_t zv_kstat; /* zvol kstats */ |
60101509 | 131 | list_node_t zv_next; /* next zvol_state_t linkage */ |
d45e010d CC |
132 | uint64_t zv_hash; /* name hash */ |
133 | struct hlist_node zv_hlink; /* hash link */ | |
5559ba09 | 134 | kmutex_t zv_state_lock; /* protects zvol_state_t */ |
040dab99 CC |
135 | atomic_t zv_suspend_ref; /* refcount for suspend */ |
136 | krwlock_t zv_suspend_lock; /* suspend lock */ | |
137 | }; | |
60101509 | 138 | |
a0bd735a BP |
139 | typedef enum { |
140 | ZVOL_ASYNC_CREATE_MINORS, | |
141 | ZVOL_ASYNC_REMOVE_MINORS, | |
142 | ZVOL_ASYNC_RENAME_MINORS, | |
143 | ZVOL_ASYNC_SET_SNAPDEV, | |
cf8738d8 | 144 | ZVOL_ASYNC_SET_VOLMODE, |
a0bd735a BP |
145 | ZVOL_ASYNC_MAX |
146 | } zvol_async_op_t; | |
147 | ||
148 | typedef struct { | |
149 | zvol_async_op_t op; | |
150 | char pool[MAXNAMELEN]; | |
151 | char name1[MAXNAMELEN]; | |
152 | char name2[MAXNAMELEN]; | |
153 | zprop_source_t source; | |
cf8738d8 | 154 | uint64_t value; |
a0bd735a BP |
155 | } zvol_task_t; |
156 | ||
60101509 BB |
157 | #define ZVOL_RDONLY 0x1 |
158 | ||
d45e010d CC |
159 | static uint64_t |
160 | zvol_name_hash(const char *name) | |
60101509 | 161 | { |
d45e010d CC |
162 | int i; |
163 | uint64_t crc = -1ULL; | |
164 | uint8_t *p = (uint8_t *)name; | |
165 | ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); | |
166 | for (i = 0; i < MAXNAMELEN - 1 && *p; i++, p++) { | |
167 | crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (*p)) & 0xFF]; | |
60101509 | 168 | } |
d45e010d | 169 | return (crc); |
60101509 BB |
170 | } |
171 | ||
172 | /* | |
58404a73 BP |
173 | * Find a zvol_state_t given the full major+minor dev_t. If found, |
174 | * return with zv_state_lock taken, otherwise, return (NULL) without | |
175 | * taking zv_state_lock. | |
60101509 BB |
176 | */ |
177 | static zvol_state_t * | |
178 | zvol_find_by_dev(dev_t dev) | |
179 | { | |
180 | zvol_state_t *zv; | |
181 | ||
7b98f0d9 | 182 | rw_enter(&zvol_state_lock, RW_READER); |
60101509 | 183 | for (zv = list_head(&zvol_state_list); zv != NULL; |
ce37ebd2 | 184 | zv = list_next(&zvol_state_list, zv)) { |
58404a73 BP |
185 | mutex_enter(&zv->zv_state_lock); |
186 | if (zv->zv_dev == dev) { | |
7b98f0d9 | 187 | rw_exit(&zvol_state_lock); |
ce37ebd2 | 188 | return (zv); |
58404a73 BP |
189 | } |
190 | mutex_exit(&zv->zv_state_lock); | |
60101509 | 191 | } |
7b98f0d9 | 192 | rw_exit(&zvol_state_lock); |
60101509 | 193 | |
ce37ebd2 | 194 | return (NULL); |
60101509 BB |
195 | } |
196 | ||
197 | /* | |
d45e010d | 198 | * Find a zvol_state_t given the name and hash generated by zvol_name_hash. |
58404a73 BP |
199 | * If found, return with zv_suspend_lock and zv_state_lock taken, otherwise, |
200 | * return (NULL) without the taking locks. The zv_suspend_lock is always taken | |
201 | * before zv_state_lock. The mode argument indicates the mode (including none) | |
202 | * for zv_suspend_lock to be taken. | |
60101509 BB |
203 | */ |
204 | static zvol_state_t * | |
58404a73 | 205 | zvol_find_by_name_hash(const char *name, uint64_t hash, int mode) |
60101509 BB |
206 | { |
207 | zvol_state_t *zv; | |
94183a9d | 208 | struct hlist_node *p = NULL; |
60101509 | 209 | |
7b98f0d9 | 210 | rw_enter(&zvol_state_lock, RW_READER); |
d45e010d CC |
211 | hlist_for_each(p, ZVOL_HT_HEAD(hash)) { |
212 | zv = hlist_entry(p, zvol_state_t, zv_hlink); | |
58404a73 | 213 | mutex_enter(&zv->zv_state_lock); |
d45e010d | 214 | if (zv->zv_hash == hash && |
58404a73 BP |
215 | strncmp(zv->zv_name, name, MAXNAMELEN) == 0) { |
216 | /* | |
217 | * this is the right zvol, take the locks in the | |
218 | * right order | |
219 | */ | |
220 | if (mode != RW_NONE && | |
221 | !rw_tryenter(&zv->zv_suspend_lock, mode)) { | |
222 | mutex_exit(&zv->zv_state_lock); | |
223 | rw_enter(&zv->zv_suspend_lock, mode); | |
224 | mutex_enter(&zv->zv_state_lock); | |
225 | /* | |
226 | * zvol cannot be renamed as we continue | |
227 | * to hold zvol_state_lock | |
228 | */ | |
229 | ASSERT(zv->zv_hash == hash && | |
230 | strncmp(zv->zv_name, name, MAXNAMELEN) | |
231 | == 0); | |
232 | } | |
7b98f0d9 | 233 | rw_exit(&zvol_state_lock); |
ce37ebd2 | 234 | return (zv); |
58404a73 BP |
235 | } |
236 | mutex_exit(&zv->zv_state_lock); | |
60101509 | 237 | } |
7b98f0d9 | 238 | rw_exit(&zvol_state_lock); |
58404a73 | 239 | |
ce37ebd2 | 240 | return (NULL); |
60101509 BB |
241 | } |
242 | ||
d45e010d | 243 | /* |
58404a73 BP |
244 | * Find a zvol_state_t given the name. |
245 | * If found, return with zv_suspend_lock and zv_state_lock taken, otherwise, | |
246 | * return (NULL) without the taking locks. The zv_suspend_lock is always taken | |
247 | * before zv_state_lock. The mode argument indicates the mode (including none) | |
248 | * for zv_suspend_lock to be taken. | |
d45e010d CC |
249 | */ |
250 | static zvol_state_t * | |
58404a73 | 251 | zvol_find_by_name(const char *name, int mode) |
d45e010d | 252 | { |
58404a73 | 253 | return (zvol_find_by_name_hash(name, zvol_name_hash(name), mode)); |
d45e010d CC |
254 | } |
255 | ||
6c285672 JL |
256 | |
257 | /* | |
258 | * Given a path, return TRUE if path is a ZVOL. | |
259 | */ | |
260 | boolean_t | |
261 | zvol_is_zvol(const char *device) | |
262 | { | |
263 | struct block_device *bdev; | |
264 | unsigned int major; | |
265 | ||
e02aaf17 | 266 | bdev = vdev_lookup_bdev(device); |
6c285672 JL |
267 | if (IS_ERR(bdev)) |
268 | return (B_FALSE); | |
269 | ||
270 | major = MAJOR(bdev->bd_dev); | |
271 | bdput(bdev); | |
272 | ||
273 | if (major == zvol_major) | |
ce37ebd2 | 274 | return (B_TRUE); |
6c285672 JL |
275 | |
276 | return (B_FALSE); | |
277 | } | |
278 | ||
60101509 BB |
279 | /* |
280 | * ZFS_IOC_CREATE callback handles dmu zvol and zap object creation. | |
281 | */ | |
282 | void | |
283 | zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) | |
284 | { | |
285 | zfs_creat_t *zct = arg; | |
286 | nvlist_t *nvprops = zct->zct_props; | |
287 | int error; | |
288 | uint64_t volblocksize, volsize; | |
289 | ||
290 | VERIFY(nvlist_lookup_uint64(nvprops, | |
291 | zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); | |
292 | if (nvlist_lookup_uint64(nvprops, | |
293 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) | |
294 | volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); | |
295 | ||
296 | /* | |
297 | * These properties must be removed from the list so the generic | |
298 | * property setting step won't apply to them. | |
299 | */ | |
300 | VERIFY(nvlist_remove_all(nvprops, | |
301 | zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); | |
302 | (void) nvlist_remove_all(nvprops, | |
303 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); | |
304 | ||
305 | error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, | |
306 | DMU_OT_NONE, 0, tx); | |
307 | ASSERT(error == 0); | |
308 | ||
309 | error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, | |
310 | DMU_OT_NONE, 0, tx); | |
311 | ASSERT(error == 0); | |
312 | ||
313 | error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); | |
314 | ASSERT(error == 0); | |
315 | } | |
316 | ||
317 | /* | |
318 | * ZFS_IOC_OBJSET_STATS entry point. | |
319 | */ | |
320 | int | |
321 | zvol_get_stats(objset_t *os, nvlist_t *nv) | |
322 | { | |
323 | int error; | |
324 | dmu_object_info_t *doi; | |
325 | uint64_t val; | |
326 | ||
327 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); | |
328 | if (error) | |
ce37ebd2 | 329 | return (SET_ERROR(error)); |
60101509 BB |
330 | |
331 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); | |
ce37ebd2 | 332 | doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP); |
60101509 BB |
333 | error = dmu_object_info(os, ZVOL_OBJ, doi); |
334 | ||
335 | if (error == 0) { | |
336 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, | |
337 | doi->doi_data_block_size); | |
338 | } | |
339 | ||
ce37ebd2 | 340 | kmem_free(doi, sizeof (dmu_object_info_t)); |
60101509 | 341 | |
ce37ebd2 | 342 | return (SET_ERROR(error)); |
60101509 BB |
343 | } |
344 | ||
345 | /* | |
346 | * Sanity check volume size. | |
347 | */ | |
348 | int | |
349 | zvol_check_volsize(uint64_t volsize, uint64_t blocksize) | |
350 | { | |
351 | if (volsize == 0) | |
2e528b49 | 352 | return (SET_ERROR(EINVAL)); |
60101509 BB |
353 | |
354 | if (volsize % blocksize != 0) | |
2e528b49 | 355 | return (SET_ERROR(EINVAL)); |
60101509 BB |
356 | |
357 | #ifdef _ILP32 | |
82ec9d41 | 358 | if (volsize - 1 > SPEC_MAXOFFSET_T) |
2e528b49 | 359 | return (SET_ERROR(EOVERFLOW)); |
60101509 BB |
360 | #endif |
361 | return (0); | |
362 | } | |
363 | ||
364 | /* | |
365 | * Ensure the zap is flushed then inform the VFS of the capacity change. | |
366 | */ | |
367 | static int | |
35d3e322 | 368 | zvol_update_volsize(uint64_t volsize, objset_t *os) |
60101509 | 369 | { |
60101509 BB |
370 | dmu_tx_t *tx; |
371 | int error; | |
513168ab | 372 | uint64_t txg; |
60101509 | 373 | |
df554c14 | 374 | tx = dmu_tx_create(os); |
60101509 | 375 | dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); |
19d55079 | 376 | dmu_tx_mark_netfree(tx); |
60101509 BB |
377 | error = dmu_tx_assign(tx, TXG_WAIT); |
378 | if (error) { | |
379 | dmu_tx_abort(tx); | |
ce37ebd2 | 380 | return (SET_ERROR(error)); |
60101509 | 381 | } |
513168ab | 382 | txg = dmu_tx_get_txg(tx); |
60101509 | 383 | |
df554c14 | 384 | error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, |
60101509 BB |
385 | &volsize, tx); |
386 | dmu_tx_commit(tx); | |
387 | ||
513168ab | 388 | txg_wait_synced(dmu_objset_pool(os), txg); |
389 | ||
35d3e322 BB |
390 | if (error == 0) |
391 | error = dmu_free_long_range(os, | |
392 | ZVOL_OBJ, volsize, DMU_OBJECT_END); | |
60101509 | 393 | |
35d3e322 BB |
394 | return (error); |
395 | } | |
60101509 | 396 | |
60101509 | 397 | /* |
7b98f0d9 BB |
398 | * Set ZFS_PROP_VOLSIZE set entry point. Note that modifying the volume |
399 | * size will result in a udev "change" event being generated. | |
60101509 BB |
400 | */ |
401 | int | |
402 | zvol_set_volsize(const char *name, uint64_t volsize) | |
403 | { | |
60101509 | 404 | objset_t *os = NULL; |
7b98f0d9 | 405 | struct gendisk *disk = NULL; |
35d3e322 | 406 | uint64_t readonly; |
7b98f0d9 | 407 | int error; |
35d3e322 | 408 | boolean_t owned = B_FALSE; |
60101509 | 409 | |
13fe0198 MA |
410 | error = dsl_prop_get_integer(name, |
411 | zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); | |
412 | if (error != 0) | |
ce37ebd2 | 413 | return (SET_ERROR(error)); |
13fe0198 | 414 | if (readonly) |
2e528b49 | 415 | return (SET_ERROR(EROFS)); |
13fe0198 | 416 | |
7b98f0d9 | 417 | zvol_state_t *zv = zvol_find_by_name(name, RW_READER); |
58404a73 BP |
418 | |
419 | ASSERT(zv == NULL || (MUTEX_HELD(&zv->zv_state_lock) && | |
420 | RW_READ_HELD(&zv->zv_suspend_lock))); | |
35d3e322 BB |
421 | |
422 | if (zv == NULL || zv->zv_objset == NULL) { | |
58404a73 BP |
423 | if (zv != NULL) |
424 | rw_exit(&zv->zv_suspend_lock); | |
b5256303 | 425 | if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, B_TRUE, |
35d3e322 | 426 | FTAG, &os)) != 0) { |
5559ba09 BP |
427 | if (zv != NULL) |
428 | mutex_exit(&zv->zv_state_lock); | |
35d3e322 BB |
429 | return (SET_ERROR(error)); |
430 | } | |
431 | owned = B_TRUE; | |
432 | if (zv != NULL) | |
433 | zv->zv_objset = os; | |
434 | } else { | |
435 | os = zv->zv_objset; | |
60101509 BB |
436 | } |
437 | ||
7b98f0d9 | 438 | dmu_object_info_t *doi = kmem_alloc(sizeof (*doi), KM_SLEEP); |
60101509 | 439 | |
ce37ebd2 BB |
440 | if ((error = dmu_object_info(os, ZVOL_OBJ, doi)) || |
441 | (error = zvol_check_volsize(volsize, doi->doi_data_block_size))) | |
35d3e322 | 442 | goto out; |
60101509 | 443 | |
35d3e322 | 444 | error = zvol_update_volsize(volsize, os); |
7b98f0d9 BB |
445 | if (error == 0 && zv != NULL) { |
446 | zv->zv_volsize = volsize; | |
447 | zv->zv_changed = 1; | |
448 | disk = zv->zv_disk; | |
449 | } | |
35d3e322 | 450 | out: |
3f7d0418 | 451 | kmem_free(doi, sizeof (dmu_object_info_t)); |
452 | ||
35d3e322 | 453 | if (owned) { |
b5256303 | 454 | dmu_objset_disown(os, B_TRUE, FTAG); |
35d3e322 BB |
455 | if (zv != NULL) |
456 | zv->zv_objset = NULL; | |
040dab99 CC |
457 | } else { |
458 | rw_exit(&zv->zv_suspend_lock); | |
35d3e322 | 459 | } |
5559ba09 BP |
460 | |
461 | if (zv != NULL) | |
462 | mutex_exit(&zv->zv_state_lock); | |
58404a73 | 463 | |
7b98f0d9 BB |
464 | if (disk != NULL) |
465 | revalidate_disk(disk); | |
466 | ||
5559ba09 | 467 | return (SET_ERROR(error)); |
60101509 BB |
468 | } |
469 | ||
470 | /* | |
471 | * Sanity check volume block size. | |
472 | */ | |
473 | int | |
4cb7b9c5 | 474 | zvol_check_volblocksize(const char *name, uint64_t volblocksize) |
60101509 | 475 | { |
4cb7b9c5 BB |
476 | /* Record sizes above 128k need the feature to be enabled */ |
477 | if (volblocksize > SPA_OLD_MAXBLOCKSIZE) { | |
478 | spa_t *spa; | |
479 | int error; | |
480 | ||
481 | if ((error = spa_open(name, &spa, FTAG)) != 0) | |
482 | return (error); | |
483 | ||
484 | if (!spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { | |
485 | spa_close(spa, FTAG); | |
486 | return (SET_ERROR(ENOTSUP)); | |
487 | } | |
488 | ||
489 | /* | |
490 | * We don't allow setting the property above 1MB, | |
491 | * unless the tunable has been changed. | |
492 | */ | |
493 | if (volblocksize > zfs_max_recordsize) | |
494 | return (SET_ERROR(EDOM)); | |
495 | ||
496 | spa_close(spa, FTAG); | |
497 | } | |
498 | ||
60101509 BB |
499 | if (volblocksize < SPA_MINBLOCKSIZE || |
500 | volblocksize > SPA_MAXBLOCKSIZE || | |
501 | !ISP2(volblocksize)) | |
2e528b49 | 502 | return (SET_ERROR(EDOM)); |
60101509 BB |
503 | |
504 | return (0); | |
505 | } | |
506 | ||
507 | /* | |
508 | * Set ZFS_PROP_VOLBLOCKSIZE set entry point. | |
509 | */ | |
510 | int | |
511 | zvol_set_volblocksize(const char *name, uint64_t volblocksize) | |
512 | { | |
513 | zvol_state_t *zv; | |
514 | dmu_tx_t *tx; | |
515 | int error; | |
516 | ||
58404a73 | 517 | zv = zvol_find_by_name(name, RW_READER); |
60101509 | 518 | |
58404a73 | 519 | if (zv == NULL) |
5559ba09 | 520 | return (SET_ERROR(ENXIO)); |
58404a73 | 521 | |
7b98f0d9 BB |
522 | ASSERT(MUTEX_HELD(&zv->zv_state_lock)); |
523 | ASSERT(RW_READ_HELD(&zv->zv_suspend_lock)); | |
60101509 | 524 | |
ba6a2402 | 525 | if (zv->zv_flags & ZVOL_RDONLY) { |
5559ba09 | 526 | mutex_exit(&zv->zv_state_lock); |
58404a73 | 527 | rw_exit(&zv->zv_suspend_lock); |
5559ba09 | 528 | return (SET_ERROR(EROFS)); |
60101509 BB |
529 | } |
530 | ||
531 | tx = dmu_tx_create(zv->zv_objset); | |
532 | dmu_tx_hold_bonus(tx, ZVOL_OBJ); | |
533 | error = dmu_tx_assign(tx, TXG_WAIT); | |
534 | if (error) { | |
535 | dmu_tx_abort(tx); | |
536 | } else { | |
537 | error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, | |
538 | volblocksize, 0, tx); | |
539 | if (error == ENOTSUP) | |
2e528b49 | 540 | error = SET_ERROR(EBUSY); |
60101509 BB |
541 | dmu_tx_commit(tx); |
542 | if (error == 0) | |
543 | zv->zv_volblocksize = volblocksize; | |
544 | } | |
5559ba09 BP |
545 | |
546 | mutex_exit(&zv->zv_state_lock); | |
58404a73 | 547 | rw_exit(&zv->zv_suspend_lock); |
60101509 | 548 | |
ce37ebd2 | 549 | return (SET_ERROR(error)); |
60101509 BB |
550 | } |
551 | ||
460a0213 DM |
552 | /* |
553 | * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we | |
554 | * implement DKIOCFREE/free-long-range. | |
555 | */ | |
556 | static int | |
867959b5 | 557 | zvol_replay_truncate(void *arg1, void *arg2, boolean_t byteswap) |
460a0213 | 558 | { |
867959b5 BB |
559 | zvol_state_t *zv = arg1; |
560 | lr_truncate_t *lr = arg2; | |
460a0213 DM |
561 | uint64_t offset, length; |
562 | ||
563 | if (byteswap) | |
564 | byteswap_uint64_array(lr, sizeof (*lr)); | |
565 | ||
566 | offset = lr->lr_offset; | |
567 | length = lr->lr_length; | |
568 | ||
569 | return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); | |
570 | } | |
571 | ||
60101509 BB |
572 | /* |
573 | * Replay a TX_WRITE ZIL transaction that didn't get committed | |
574 | * after a system failure | |
575 | */ | |
576 | static int | |
867959b5 | 577 | zvol_replay_write(void *arg1, void *arg2, boolean_t byteswap) |
60101509 | 578 | { |
867959b5 BB |
579 | zvol_state_t *zv = arg1; |
580 | lr_write_t *lr = arg2; | |
60101509 | 581 | objset_t *os = zv->zv_objset; |
5c214ae3 BB |
582 | char *data = (char *)(lr + 1); /* data follows lr_write_t */ |
583 | uint64_t offset, length; | |
60101509 BB |
584 | dmu_tx_t *tx; |
585 | int error; | |
586 | ||
587 | if (byteswap) | |
588 | byteswap_uint64_array(lr, sizeof (*lr)); | |
589 | ||
5c214ae3 BB |
590 | offset = lr->lr_offset; |
591 | length = lr->lr_length; | |
592 | ||
593 | /* If it's a dmu_sync() block, write the whole block */ | |
594 | if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { | |
595 | uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); | |
596 | if (length < blocksize) { | |
597 | offset -= offset % blocksize; | |
598 | length = blocksize; | |
599 | } | |
600 | } | |
601 | ||
60101509 | 602 | tx = dmu_tx_create(os); |
5c214ae3 | 603 | dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); |
60101509 BB |
604 | error = dmu_tx_assign(tx, TXG_WAIT); |
605 | if (error) { | |
606 | dmu_tx_abort(tx); | |
607 | } else { | |
5c214ae3 | 608 | dmu_write(os, ZVOL_OBJ, offset, length, data, tx); |
60101509 BB |
609 | dmu_tx_commit(tx); |
610 | } | |
611 | ||
5c214ae3 | 612 | return (error); |
60101509 BB |
613 | } |
614 | ||
615 | static int | |
867959b5 | 616 | zvol_replay_err(void *arg1, void *arg2, boolean_t byteswap) |
60101509 | 617 | { |
2e528b49 | 618 | return (SET_ERROR(ENOTSUP)); |
60101509 BB |
619 | } |
620 | ||
621 | /* | |
622 | * Callback vectors for replaying records. | |
460a0213 | 623 | * Only TX_WRITE and TX_TRUNCATE are needed for zvol. |
60101509 | 624 | */ |
867959b5 BB |
625 | zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { |
626 | zvol_replay_err, /* no such transaction type */ | |
627 | zvol_replay_err, /* TX_CREATE */ | |
628 | zvol_replay_err, /* TX_MKDIR */ | |
629 | zvol_replay_err, /* TX_MKXATTR */ | |
630 | zvol_replay_err, /* TX_SYMLINK */ | |
631 | zvol_replay_err, /* TX_REMOVE */ | |
632 | zvol_replay_err, /* TX_RMDIR */ | |
633 | zvol_replay_err, /* TX_LINK */ | |
634 | zvol_replay_err, /* TX_RENAME */ | |
635 | zvol_replay_write, /* TX_WRITE */ | |
636 | zvol_replay_truncate, /* TX_TRUNCATE */ | |
637 | zvol_replay_err, /* TX_SETATTR */ | |
638 | zvol_replay_err, /* TX_ACL */ | |
639 | zvol_replay_err, /* TX_CREATE_ATTR */ | |
640 | zvol_replay_err, /* TX_CREATE_ACL_ATTR */ | |
641 | zvol_replay_err, /* TX_MKDIR_ACL */ | |
642 | zvol_replay_err, /* TX_MKDIR_ATTR */ | |
643 | zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ | |
644 | zvol_replay_err, /* TX_WRITE2 */ | |
60101509 BB |
645 | }; |
646 | ||
647 | /* | |
648 | * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. | |
649 | * | |
650 | * We store data in the log buffers if it's small enough. | |
651 | * Otherwise we will later flush the data out via dmu_sync(). | |
652 | */ | |
653 | ssize_t zvol_immediate_write_sz = 32768; | |
654 | ||
655 | static void | |
ce37ebd2 BB |
656 | zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset, |
657 | uint64_t size, int sync) | |
60101509 BB |
658 | { |
659 | uint32_t blocksize = zv->zv_volblocksize; | |
660 | zilog_t *zilog = zv->zv_zilog; | |
1b7c1e5c | 661 | itx_wr_state_t write_state; |
60101509 BB |
662 | |
663 | if (zil_replaying(zilog, tx)) | |
664 | return; | |
665 | ||
1b7c1e5c GDN |
666 | if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) |
667 | write_state = WR_INDIRECT; | |
668 | else if (!spa_has_slogs(zilog->zl_spa) && | |
669 | size >= blocksize && blocksize > zvol_immediate_write_sz) | |
670 | write_state = WR_INDIRECT; | |
671 | else if (sync) | |
672 | write_state = WR_COPIED; | |
673 | else | |
674 | write_state = WR_NEED_COPY; | |
60101509 BB |
675 | |
676 | while (size) { | |
677 | itx_t *itx; | |
678 | lr_write_t *lr; | |
1b7c1e5c GDN |
679 | itx_wr_state_t wr_state = write_state; |
680 | ssize_t len = size; | |
60101509 | 681 | |
1b7c1e5c GDN |
682 | if (wr_state == WR_COPIED && size > ZIL_MAX_COPIED_DATA) |
683 | wr_state = WR_NEED_COPY; | |
684 | else if (wr_state == WR_INDIRECT) | |
685 | len = MIN(blocksize - P2PHASE(offset, blocksize), size); | |
60101509 BB |
686 | |
687 | itx = zil_itx_create(TX_WRITE, sizeof (*lr) + | |
1b7c1e5c | 688 | (wr_state == WR_COPIED ? len : 0)); |
60101509 | 689 | lr = (lr_write_t *)&itx->itx_lr; |
5228cf01 RY |
690 | if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn, |
691 | offset, len, lr+1, DMU_READ_NO_PREFETCH) != 0) { | |
60101509 BB |
692 | zil_itx_destroy(itx); |
693 | itx = zil_itx_create(TX_WRITE, sizeof (*lr)); | |
694 | lr = (lr_write_t *)&itx->itx_lr; | |
1b7c1e5c | 695 | wr_state = WR_NEED_COPY; |
60101509 BB |
696 | } |
697 | ||
1b7c1e5c | 698 | itx->itx_wr_state = wr_state; |
60101509 BB |
699 | lr->lr_foid = ZVOL_OBJ; |
700 | lr->lr_offset = offset; | |
701 | lr->lr_length = len; | |
702 | lr->lr_blkoff = 0; | |
703 | BP_ZERO(&lr->lr_blkptr); | |
704 | ||
705 | itx->itx_private = zv; | |
706 | itx->itx_sync = sync; | |
707 | ||
708 | (void) zil_itx_assign(zilog, itx, tx); | |
709 | ||
710 | offset += len; | |
711 | size -= len; | |
712 | } | |
713 | } | |
714 | ||
692e55b8 CC |
715 | typedef struct zv_request { |
716 | zvol_state_t *zv; | |
717 | struct bio *bio; | |
5d43cc9a | 718 | locked_range_t *lr; |
692e55b8 CC |
719 | } zv_request_t; |
720 | ||
721 | static void | |
722 | uio_from_bio(uio_t *uio, struct bio *bio) | |
60101509 | 723 | { |
692e55b8 CC |
724 | uio->uio_bvec = &bio->bi_io_vec[BIO_BI_IDX(bio)]; |
725 | uio->uio_skip = BIO_BI_SKIP(bio); | |
726 | uio->uio_resid = BIO_BI_SIZE(bio); | |
727 | uio->uio_iovcnt = bio->bi_vcnt - BIO_BI_IDX(bio); | |
728 | uio->uio_loffset = BIO_BI_SECTOR(bio) << 9; | |
729 | uio->uio_limit = MAXOFFSET_T; | |
730 | uio->uio_segflg = UIO_BVEC; | |
731 | } | |
732 | ||
733 | static void | |
734 | zvol_write(void *arg) | |
735 | { | |
a448a255 SD |
736 | int error = 0; |
737 | ||
692e55b8 CC |
738 | zv_request_t *zvr = arg; |
739 | struct bio *bio = zvr->bio; | |
740 | uio_t uio; | |
692e55b8 | 741 | uio_from_bio(&uio, bio); |
60101509 | 742 | |
a448a255 | 743 | zvol_state_t *zv = zvr->zv; |
5428dc51 BP |
744 | ASSERT(zv && zv->zv_open_count > 0); |
745 | ||
a448a255 SD |
746 | ssize_t start_resid = uio.uio_resid; |
747 | unsigned long start_jif = jiffies; | |
787acae0 GDN |
748 | blk_generic_start_io_acct(zv->zv_queue, WRITE, bio_sectors(bio), |
749 | &zv->zv_disk->part0); | |
b18019d2 | 750 | |
a448a255 SD |
751 | boolean_t sync = |
752 | bio_is_fua(bio) || zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS; | |
692e55b8 | 753 | |
a448a255 | 754 | uint64_t volsize = zv->zv_volsize; |
692e55b8 CC |
755 | while (uio.uio_resid > 0 && uio.uio_loffset < volsize) { |
756 | uint64_t bytes = MIN(uio.uio_resid, DMU_MAX_ACCESS >> 1); | |
757 | uint64_t off = uio.uio_loffset; | |
a765a34a | 758 | dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); |
b18019d2 | 759 | |
a765a34a RY |
760 | if (bytes > volsize - off) /* don't write past the end */ |
761 | bytes = volsize - off; | |
2727b9d3 | 762 | |
a765a34a | 763 | dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); |
60101509 | 764 | |
a765a34a RY |
765 | /* This will only fail for ENOSPC */ |
766 | error = dmu_tx_assign(tx, TXG_WAIT); | |
767 | if (error) { | |
768 | dmu_tx_abort(tx); | |
769 | break; | |
770 | } | |
5228cf01 | 771 | error = dmu_write_uio_dnode(zv->zv_dn, &uio, bytes, tx); |
a448a255 | 772 | if (error == 0) { |
a765a34a | 773 | zvol_log_write(zv, tx, off, bytes, sync); |
a448a255 | 774 | } |
a765a34a | 775 | dmu_tx_commit(tx); |
60101509 | 776 | |
a765a34a RY |
777 | if (error) |
778 | break; | |
60101509 | 779 | } |
5d43cc9a | 780 | rangelock_exit(zvr->lr); |
a448a255 SD |
781 | |
782 | int64_t nwritten = start_resid - uio.uio_resid; | |
783 | dataset_kstats_update_write_kstats(&zv->zv_kstat, nwritten); | |
784 | task_io_account_write(nwritten); | |
785 | ||
a765a34a | 786 | if (sync) |
60101509 | 787 | zil_commit(zv->zv_zilog, ZVOL_OBJ); |
692e55b8 CC |
788 | |
789 | rw_exit(&zv->zv_suspend_lock); | |
787acae0 GDN |
790 | blk_generic_end_io_acct(zv->zv_queue, WRITE, &zv->zv_disk->part0, |
791 | start_jif); | |
692e55b8 CC |
792 | BIO_END_IO(bio, -error); |
793 | kmem_free(zvr, sizeof (zv_request_t)); | |
60101509 BB |
794 | } |
795 | ||
460a0213 DM |
796 | /* |
797 | * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. | |
798 | */ | |
799 | static void | |
800 | zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, | |
801 | boolean_t sync) | |
802 | { | |
803 | itx_t *itx; | |
804 | lr_truncate_t *lr; | |
805 | zilog_t *zilog = zv->zv_zilog; | |
806 | ||
807 | if (zil_replaying(zilog, tx)) | |
808 | return; | |
809 | ||
810 | itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); | |
811 | lr = (lr_truncate_t *)&itx->itx_lr; | |
812 | lr->lr_foid = ZVOL_OBJ; | |
813 | lr->lr_offset = off; | |
814 | lr->lr_length = len; | |
815 | ||
816 | itx->itx_sync = sync; | |
817 | zil_itx_assign(zilog, itx, tx); | |
818 | } | |
819 | ||
692e55b8 CC |
820 | static void |
821 | zvol_discard(void *arg) | |
30930fba | 822 | { |
692e55b8 CC |
823 | zv_request_t *zvr = arg; |
824 | struct bio *bio = zvr->bio; | |
825 | zvol_state_t *zv = zvr->zv; | |
37f9dac5 RY |
826 | uint64_t start = BIO_BI_SECTOR(bio) << 9; |
827 | uint64_t size = BIO_BI_SIZE(bio); | |
828 | uint64_t end = start + size; | |
f763c3d1 | 829 | boolean_t sync; |
692e55b8 | 830 | int error = 0; |
460a0213 | 831 | dmu_tx_t *tx; |
692e55b8 | 832 | unsigned long start_jif; |
30930fba | 833 | |
5428dc51 BP |
834 | ASSERT(zv && zv->zv_open_count > 0); |
835 | ||
692e55b8 | 836 | start_jif = jiffies; |
787acae0 GDN |
837 | blk_generic_start_io_acct(zv->zv_queue, WRITE, bio_sectors(bio), |
838 | &zv->zv_disk->part0); | |
692e55b8 | 839 | |
f763c3d1 | 840 | sync = bio_is_fua(bio) || zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS; |
841 | ||
692e55b8 CC |
842 | if (end > zv->zv_volsize) { |
843 | error = SET_ERROR(EIO); | |
f763c3d1 | 844 | goto unlock; |
692e55b8 | 845 | } |
30930fba | 846 | |
089fa91b | 847 | /* |
cf41432c BB |
848 | * Align the request to volume block boundaries when a secure erase is |
849 | * not required. This will prevent dnode_free_range() from zeroing out | |
850 | * the unaligned parts which is slow (read-modify-write) and useless | |
851 | * since we are not freeing any space by doing so. | |
089fa91b | 852 | */ |
cf41432c | 853 | if (!bio_is_secure_erase(bio)) { |
fa565676 RY |
854 | start = P2ROUNDUP(start, zv->zv_volblocksize); |
855 | end = P2ALIGN(end, zv->zv_volblocksize); | |
f52ebcb3 | 856 | size = end - start; |
fa565676 | 857 | } |
089fa91b | 858 | |
37f9dac5 | 859 | if (start >= end) |
f763c3d1 | 860 | goto unlock; |
30930fba | 861 | |
460a0213 DM |
862 | tx = dmu_tx_create(zv->zv_objset); |
863 | dmu_tx_mark_netfree(tx); | |
864 | error = dmu_tx_assign(tx, TXG_WAIT); | |
865 | if (error != 0) { | |
866 | dmu_tx_abort(tx); | |
867 | } else { | |
868 | zvol_log_truncate(zv, tx, start, size, B_TRUE); | |
869 | dmu_tx_commit(tx); | |
870 | error = dmu_free_long_range(zv->zv_objset, | |
871 | ZVOL_OBJ, start, size); | |
872 | } | |
f763c3d1 | 873 | unlock: |
5d43cc9a MA |
874 | rangelock_exit(zvr->lr); |
875 | ||
f763c3d1 | 876 | if (error == 0 && sync) |
877 | zil_commit(zv->zv_zilog, ZVOL_OBJ); | |
878 | ||
692e55b8 | 879 | rw_exit(&zv->zv_suspend_lock); |
787acae0 GDN |
880 | blk_generic_end_io_acct(zv->zv_queue, WRITE, &zv->zv_disk->part0, |
881 | start_jif); | |
692e55b8 CC |
882 | BIO_END_IO(bio, -error); |
883 | kmem_free(zvr, sizeof (zv_request_t)); | |
30930fba | 884 | } |
30930fba | 885 | |
692e55b8 CC |
886 | static void |
887 | zvol_read(void *arg) | |
60101509 | 888 | { |
a448a255 SD |
889 | int error = 0; |
890 | ||
692e55b8 CC |
891 | zv_request_t *zvr = arg; |
892 | struct bio *bio = zvr->bio; | |
893 | uio_t uio; | |
692e55b8 | 894 | uio_from_bio(&uio, bio); |
b18019d2 | 895 | |
a448a255 | 896 | zvol_state_t *zv = zvr->zv; |
5428dc51 BP |
897 | ASSERT(zv && zv->zv_open_count > 0); |
898 | ||
a448a255 SD |
899 | ssize_t start_resid = uio.uio_resid; |
900 | unsigned long start_jif = jiffies; | |
787acae0 GDN |
901 | blk_generic_start_io_acct(zv->zv_queue, READ, bio_sectors(bio), |
902 | &zv->zv_disk->part0); | |
692e55b8 | 903 | |
a448a255 | 904 | uint64_t volsize = zv->zv_volsize; |
692e55b8 CC |
905 | while (uio.uio_resid > 0 && uio.uio_loffset < volsize) { |
906 | uint64_t bytes = MIN(uio.uio_resid, DMU_MAX_ACCESS >> 1); | |
60101509 | 907 | |
a765a34a | 908 | /* don't read past the end */ |
692e55b8 CC |
909 | if (bytes > volsize - uio.uio_loffset) |
910 | bytes = volsize - uio.uio_loffset; | |
60101509 | 911 | |
5228cf01 | 912 | error = dmu_read_uio_dnode(zv->zv_dn, &uio, bytes); |
a765a34a RY |
913 | if (error) { |
914 | /* convert checksum errors into IO errors */ | |
915 | if (error == ECKSUM) | |
916 | error = SET_ERROR(EIO); | |
917 | break; | |
918 | } | |
919 | } | |
5d43cc9a | 920 | rangelock_exit(zvr->lr); |
692e55b8 | 921 | |
a448a255 SD |
922 | int64_t nread = start_resid - uio.uio_resid; |
923 | dataset_kstats_update_read_kstats(&zv->zv_kstat, nread); | |
924 | task_io_account_read(nread); | |
925 | ||
692e55b8 | 926 | rw_exit(&zv->zv_suspend_lock); |
787acae0 GDN |
927 | blk_generic_end_io_acct(zv->zv_queue, READ, &zv->zv_disk->part0, |
928 | start_jif); | |
692e55b8 CC |
929 | BIO_END_IO(bio, -error); |
930 | kmem_free(zvr, sizeof (zv_request_t)); | |
60101509 BB |
931 | } |
932 | ||
37f9dac5 RY |
933 | static MAKE_REQUEST_FN_RET |
934 | zvol_request(struct request_queue *q, struct bio *bio) | |
60101509 BB |
935 | { |
936 | zvol_state_t *zv = q->queuedata; | |
37f9dac5 | 937 | fstrans_cookie_t cookie = spl_fstrans_mark(); |
692e55b8 CC |
938 | uint64_t offset = BIO_BI_SECTOR(bio) << 9; |
939 | uint64_t size = BIO_BI_SIZE(bio); | |
8198d18c | 940 | int rw = bio_data_dir(bio); |
692e55b8 | 941 | zv_request_t *zvr; |
a765a34a | 942 | |
692e55b8 | 943 | if (bio_has_data(bio) && offset + size > zv->zv_volsize) { |
37f9dac5 | 944 | printk(KERN_INFO |
a765a34a | 945 | "%s: bad access: offset=%llu, size=%lu\n", |
37f9dac5 | 946 | zv->zv_disk->disk_name, |
692e55b8 CC |
947 | (long long unsigned)offset, |
948 | (long unsigned)size); | |
37f9dac5 | 949 | |
692e55b8 CC |
950 | BIO_END_IO(bio, -SET_ERROR(EIO)); |
951 | goto out; | |
952 | } | |
8198d18c RY |
953 | |
954 | if (rw == WRITE) { | |
f763c3d1 | 955 | boolean_t need_sync = B_FALSE; |
956 | ||
37f9dac5 | 957 | if (unlikely(zv->zv_flags & ZVOL_RDONLY)) { |
692e55b8 CC |
958 | BIO_END_IO(bio, -SET_ERROR(EROFS)); |
959 | goto out; | |
60101509 BB |
960 | } |
961 | ||
692e55b8 CC |
962 | /* |
963 | * To be released in the I/O function. See the comment on | |
2d76ab9e | 964 | * rangelock_enter() below. |
692e55b8 CC |
965 | */ |
966 | rw_enter(&zv->zv_suspend_lock, RW_READER); | |
967 | ||
968 | /* bio marked as FLUSH need to flush before write */ | |
969 | if (bio_is_flush(bio)) | |
970 | zil_commit(zv->zv_zilog, ZVOL_OBJ); | |
971 | ||
972 | /* Some requests are just for flush and nothing else. */ | |
973 | if (size == 0) { | |
974 | rw_exit(&zv->zv_suspend_lock); | |
975 | BIO_END_IO(bio, 0); | |
976 | goto out; | |
37f9dac5 | 977 | } |
60101509 | 978 | |
692e55b8 CC |
979 | zvr = kmem_alloc(sizeof (zv_request_t), KM_SLEEP); |
980 | zvr->zv = zv; | |
981 | zvr->bio = bio; | |
982 | ||
a765a34a | 983 | /* |
692e55b8 CC |
984 | * To be released in the I/O function. Since the I/O functions |
985 | * are asynchronous, we take it here synchronously to make | |
986 | * sure overlapped I/Os are properly ordered. | |
a765a34a | 987 | */ |
5d43cc9a | 988 | zvr->lr = rangelock_enter(&zv->zv_rangelock, offset, size, |
692e55b8 | 989 | RL_WRITER); |
f763c3d1 | 990 | /* |
991 | * Sync writes and discards execute zil_commit() which may need | |
992 | * to take a RL_READER lock on the whole block being modified | |
993 | * via its zillog->zl_get_data(): to avoid circular dependency | |
994 | * issues with taskq threads execute these requests | |
995 | * synchronously here in zvol_request(). | |
996 | */ | |
997 | need_sync = bio_is_fua(bio) || | |
998 | zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS; | |
692e55b8 | 999 | if (bio_is_discard(bio) || bio_is_secure_erase(bio)) { |
f763c3d1 | 1000 | if (zvol_request_sync || need_sync || |
1001 | taskq_dispatch(zvol_taskq, zvol_discard, zvr, | |
1002 | TQ_SLEEP) == TASKQID_INVALID) | |
692e55b8 CC |
1003 | zvol_discard(zvr); |
1004 | } else { | |
f763c3d1 | 1005 | if (zvol_request_sync || need_sync || |
1006 | taskq_dispatch(zvol_taskq, zvol_write, zvr, | |
1007 | TQ_SLEEP) == TASKQID_INVALID) | |
692e55b8 | 1008 | zvol_write(zvr); |
a765a34a | 1009 | } |
692e55b8 | 1010 | } else { |
9abbee49 TK |
1011 | /* |
1012 | * The SCST driver, and possibly others, may issue READ I/Os | |
1013 | * with a length of zero bytes. These empty I/Os contain no | |
1014 | * data and require no additional handling. | |
1015 | */ | |
1016 | if (size == 0) { | |
1017 | BIO_END_IO(bio, 0); | |
1018 | goto out; | |
1019 | } | |
1020 | ||
692e55b8 CC |
1021 | zvr = kmem_alloc(sizeof (zv_request_t), KM_SLEEP); |
1022 | zvr->zv = zv; | |
1023 | zvr->bio = bio; | |
a765a34a | 1024 | |
692e55b8 | 1025 | rw_enter(&zv->zv_suspend_lock, RW_READER); |
30930fba | 1026 | |
5d43cc9a | 1027 | zvr->lr = rangelock_enter(&zv->zv_rangelock, offset, size, |
692e55b8 CC |
1028 | RL_READER); |
1029 | if (zvol_request_sync || taskq_dispatch(zvol_taskq, | |
1030 | zvol_read, zvr, TQ_SLEEP) == TASKQID_INVALID) | |
1031 | zvol_read(zvr); | |
1032 | } | |
1033 | ||
1034 | out: | |
37f9dac5 RY |
1035 | spl_fstrans_unmark(cookie); |
1036 | #ifdef HAVE_MAKE_REQUEST_FN_RET_INT | |
1037 | return (0); | |
1a093716 CC |
1038 | #elif defined(HAVE_MAKE_REQUEST_FN_RET_QC) |
1039 | return (BLK_QC_T_NONE); | |
37f9dac5 | 1040 | #endif |
60101509 BB |
1041 | } |
1042 | ||
900d09b2 | 1043 | /* ARGSUSED */ |
60101509 BB |
1044 | static void |
1045 | zvol_get_done(zgd_t *zgd, int error) | |
1046 | { | |
1047 | if (zgd->zgd_db) | |
1048 | dmu_buf_rele(zgd->zgd_db, zgd); | |
1049 | ||
5d43cc9a | 1050 | rangelock_exit(zgd->zgd_lr); |
60101509 | 1051 | |
60101509 BB |
1052 | kmem_free(zgd, sizeof (zgd_t)); |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Get data to generate a TX_WRITE intent log record. | |
1057 | */ | |
1058 | static int | |
1ce23dca | 1059 | zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio) |
60101509 BB |
1060 | { |
1061 | zvol_state_t *zv = arg; | |
60101509 BB |
1062 | uint64_t offset = lr->lr_offset; |
1063 | uint64_t size = lr->lr_length; | |
1064 | dmu_buf_t *db; | |
1065 | zgd_t *zgd; | |
1066 | int error; | |
1067 | ||
1ce23dca PS |
1068 | ASSERT3P(lwb, !=, NULL); |
1069 | ASSERT3P(zio, !=, NULL); | |
1070 | ASSERT3U(size, !=, 0); | |
60101509 | 1071 | |
79c76d5b | 1072 | zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP); |
1ce23dca | 1073 | zgd->zgd_lwb = lwb; |
60101509 BB |
1074 | |
1075 | /* | |
1076 | * Write records come in two flavors: immediate and indirect. | |
1077 | * For small writes it's cheaper to store the data with the | |
1078 | * log record (immediate); for large writes it's cheaper to | |
1079 | * sync the data and get a pointer to it (indirect) so that | |
1080 | * we don't have to write the data twice. | |
1081 | */ | |
1082 | if (buf != NULL) { /* immediate write */ | |
5d43cc9a | 1083 | zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, |
f763c3d1 | 1084 | RL_READER); |
5228cf01 | 1085 | error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf, |
60101509 | 1086 | DMU_READ_NO_PREFETCH); |
f763c3d1 | 1087 | } else { /* indirect write */ |
1088 | /* | |
1089 | * Have to lock the whole block to ensure when it's written out | |
1090 | * and its checksum is being calculated that no one can change | |
1091 | * the data. Contrarily to zfs_get_data we need not re-check | |
1092 | * blocksize after we get the lock because it cannot be changed. | |
1093 | */ | |
60101509 BB |
1094 | size = zv->zv_volblocksize; |
1095 | offset = P2ALIGN_TYPED(offset, size, uint64_t); | |
5d43cc9a | 1096 | zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, |
f763c3d1 | 1097 | RL_READER); |
5228cf01 | 1098 | error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db, |
60101509 BB |
1099 | DMU_READ_NO_PREFETCH); |
1100 | if (error == 0) { | |
02dc43bc | 1101 | blkptr_t *bp = &lr->lr_blkptr; |
03c6040b | 1102 | |
60101509 | 1103 | zgd->zgd_db = db; |
02dc43bc | 1104 | zgd->zgd_bp = bp; |
60101509 BB |
1105 | |
1106 | ASSERT(db != NULL); | |
1107 | ASSERT(db->db_offset == offset); | |
1108 | ASSERT(db->db_size == size); | |
1109 | ||
1110 | error = dmu_sync(zio, lr->lr_common.lrc_txg, | |
1111 | zvol_get_done, zgd); | |
1112 | ||
1113 | if (error == 0) | |
1114 | return (0); | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | zvol_get_done(zgd, error); | |
1119 | ||
ce37ebd2 | 1120 | return (SET_ERROR(error)); |
60101509 BB |
1121 | } |
1122 | ||
1123 | /* | |
d45e010d | 1124 | * The zvol_state_t's are inserted into zvol_state_list and zvol_htable. |
60101509 BB |
1125 | */ |
1126 | static void | |
d45e010d | 1127 | zvol_insert(zvol_state_t *zv) |
60101509 | 1128 | { |
7b98f0d9 | 1129 | ASSERT(RW_WRITE_HELD(&zvol_state_lock)); |
d45e010d CC |
1130 | ASSERT3U(MINOR(zv->zv_dev) & ZVOL_MINOR_MASK, ==, 0); |
1131 | list_insert_head(&zvol_state_list, zv); | |
1132 | hlist_add_head(&zv->zv_hlink, ZVOL_HT_HEAD(zv->zv_hash)); | |
60101509 BB |
1133 | } |
1134 | ||
1135 | /* | |
1136 | * Simply remove the zvol from to list of zvols. | |
1137 | */ | |
1138 | static void | |
d45e010d | 1139 | zvol_remove(zvol_state_t *zv) |
60101509 | 1140 | { |
7b98f0d9 | 1141 | ASSERT(RW_WRITE_HELD(&zvol_state_lock)); |
d45e010d CC |
1142 | list_remove(&zvol_state_list, zv); |
1143 | hlist_del(&zv->zv_hlink); | |
60101509 BB |
1144 | } |
1145 | ||
040dab99 CC |
1146 | /* |
1147 | * Setup zv after we just own the zv->objset | |
1148 | */ | |
60101509 | 1149 | static int |
040dab99 | 1150 | zvol_setup_zv(zvol_state_t *zv) |
60101509 | 1151 | { |
60101509 BB |
1152 | uint64_t volsize; |
1153 | int error; | |
1154 | uint64_t ro; | |
040dab99 | 1155 | objset_t *os = zv->zv_objset; |
1ee159f4 | 1156 | |
7b98f0d9 BB |
1157 | ASSERT(MUTEX_HELD(&zv->zv_state_lock)); |
1158 | ASSERT(RW_LOCK_HELD(&zv->zv_suspend_lock)); | |
58404a73 | 1159 | |
1ee159f4 BP |
1160 | error = dsl_prop_get_integer(zv->zv_name, "readonly", &ro, NULL); |
1161 | if (error) | |
040dab99 | 1162 | return (SET_ERROR(error)); |
60101509 BB |
1163 | |
1164 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); | |
1ee159f4 | 1165 | if (error) |
040dab99 | 1166 | return (SET_ERROR(error)); |
60101509 | 1167 | |
5228cf01 | 1168 | error = dnode_hold(os, ZVOL_OBJ, FTAG, &zv->zv_dn); |
1ee159f4 | 1169 | if (error) |
040dab99 | 1170 | return (SET_ERROR(error)); |
60101509 BB |
1171 | |
1172 | set_capacity(zv->zv_disk, volsize >> 9); | |
1173 | zv->zv_volsize = volsize; | |
1174 | zv->zv_zilog = zil_open(os, zvol_get_data); | |
1175 | ||
a4430fce GW |
1176 | if (ro || dmu_objset_is_snapshot(os) || |
1177 | !spa_writeable(dmu_objset_spa(os))) { | |
babf3f9b MM |
1178 | set_disk_ro(zv->zv_disk, 1); |
1179 | zv->zv_flags |= ZVOL_RDONLY; | |
60101509 | 1180 | } else { |
babf3f9b MM |
1181 | set_disk_ro(zv->zv_disk, 0); |
1182 | zv->zv_flags &= ~ZVOL_RDONLY; | |
60101509 | 1183 | } |
040dab99 | 1184 | return (0); |
60101509 BB |
1185 | } |
1186 | ||
040dab99 CC |
1187 | /* |
1188 | * Shutdown every zv_objset related stuff except zv_objset itself. | |
1189 | * The is the reverse of zvol_setup_zv. | |
1190 | */ | |
60101509 | 1191 | static void |
040dab99 | 1192 | zvol_shutdown_zv(zvol_state_t *zv) |
60101509 | 1193 | { |
58404a73 BP |
1194 | ASSERT(MUTEX_HELD(&zv->zv_state_lock) && |
1195 | RW_LOCK_HELD(&zv->zv_suspend_lock)); | |
1196 | ||
60101509 BB |
1197 | zil_close(zv->zv_zilog); |
1198 | zv->zv_zilog = NULL; | |
04434775 | 1199 | |
5228cf01 RY |
1200 | dnode_rele(zv->zv_dn, FTAG); |
1201 | zv->zv_dn = NULL; | |
04434775 MA |
1202 | |
1203 | /* | |
47ab01a1 TC |
1204 | * Evict cached data. We must write out any dirty data before |
1205 | * disowning the dataset. | |
04434775 | 1206 | */ |
47ab01a1 | 1207 | if (!(zv->zv_flags & ZVOL_RDONLY)) |
04434775 MA |
1208 | txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); |
1209 | (void) dmu_objset_evict_dbufs(zv->zv_objset); | |
040dab99 CC |
1210 | } |
1211 | ||
1212 | /* | |
1213 | * return the proper tag for rollback and recv | |
1214 | */ | |
1215 | void * | |
1216 | zvol_tag(zvol_state_t *zv) | |
1217 | { | |
1218 | ASSERT(RW_WRITE_HELD(&zv->zv_suspend_lock)); | |
1219 | return (zv->zv_open_count > 0 ? zv : NULL); | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Suspend the zvol for recv and rollback. | |
1224 | */ | |
1225 | zvol_state_t * | |
1226 | zvol_suspend(const char *name) | |
1227 | { | |
1228 | zvol_state_t *zv; | |
1229 | ||
58404a73 BP |
1230 | zv = zvol_find_by_name(name, RW_WRITER); |
1231 | ||
1232 | if (zv == NULL) | |
5559ba09 | 1233 | return (NULL); |
04434775 | 1234 | |
040dab99 | 1235 | /* block all I/O, release in zvol_resume. */ |
7b98f0d9 BB |
1236 | ASSERT(MUTEX_HELD(&zv->zv_state_lock)); |
1237 | ASSERT(RW_WRITE_HELD(&zv->zv_suspend_lock)); | |
040dab99 CC |
1238 | |
1239 | atomic_inc(&zv->zv_suspend_ref); | |
1240 | ||
1241 | if (zv->zv_open_count > 0) | |
1242 | zvol_shutdown_zv(zv); | |
5559ba09 | 1243 | |
58404a73 BP |
1244 | /* |
1245 | * do not hold zv_state_lock across suspend/resume to | |
1246 | * avoid locking up zvol lookups | |
1247 | */ | |
5559ba09 | 1248 | mutex_exit(&zv->zv_state_lock); |
58404a73 BP |
1249 | |
1250 | /* zv_suspend_lock is released in zvol_resume() */ | |
040dab99 CC |
1251 | return (zv); |
1252 | } | |
1253 | ||
1254 | int | |
1255 | zvol_resume(zvol_state_t *zv) | |
1256 | { | |
1257 | int error = 0; | |
1258 | ||
1259 | ASSERT(RW_WRITE_HELD(&zv->zv_suspend_lock)); | |
2d82116e | 1260 | |
58404a73 BP |
1261 | mutex_enter(&zv->zv_state_lock); |
1262 | ||
040dab99 CC |
1263 | if (zv->zv_open_count > 0) { |
1264 | VERIFY0(dmu_objset_hold(zv->zv_name, zv, &zv->zv_objset)); | |
1265 | VERIFY3P(zv->zv_objset->os_dsl_dataset->ds_owner, ==, zv); | |
1266 | VERIFY(dsl_dataset_long_held(zv->zv_objset->os_dsl_dataset)); | |
1267 | dmu_objset_rele(zv->zv_objset, zv); | |
1268 | ||
1269 | error = zvol_setup_zv(zv); | |
1270 | } | |
58404a73 BP |
1271 | |
1272 | mutex_exit(&zv->zv_state_lock); | |
1273 | ||
040dab99 CC |
1274 | rw_exit(&zv->zv_suspend_lock); |
1275 | /* | |
1276 | * We need this because we don't hold zvol_state_lock while releasing | |
1277 | * zv_suspend_lock. zvol_remove_minors_impl thus cannot check | |
1278 | * zv_suspend_lock to determine it is safe to free because rwlock is | |
1279 | * not inherent atomic. | |
1280 | */ | |
1281 | atomic_dec(&zv->zv_suspend_ref); | |
1282 | ||
1283 | return (SET_ERROR(error)); | |
1284 | } | |
1285 | ||
1286 | static int | |
163a8c28 | 1287 | zvol_first_open(zvol_state_t *zv, boolean_t readonly) |
040dab99 CC |
1288 | { |
1289 | objset_t *os; | |
07783588 | 1290 | int error, locked = 0; |
163a8c28 | 1291 | boolean_t ro; |
07783588 | 1292 | |
58404a73 BP |
1293 | ASSERT(RW_READ_HELD(&zv->zv_suspend_lock)); |
1294 | ASSERT(MUTEX_HELD(&zv->zv_state_lock)); | |
1295 | ||
07783588 BP |
1296 | /* |
1297 | * In all other cases the spa_namespace_lock is taken before the | |
1298 | * bdev->bd_mutex lock. But in this case the Linux __blkdev_get() | |
1299 | * function calls fops->open() with the bdev->bd_mutex lock held. | |
1300 | * This deadlock can be easily observed with zvols used as vdevs. | |
1301 | * | |
1302 | * To avoid a potential lock inversion deadlock we preemptively | |
1303 | * try to take the spa_namespace_lock(). Normally it will not | |
1304 | * be contended and this is safe because spa_open_common() handles | |
1305 | * the case where the caller already holds the spa_namespace_lock. | |
1306 | * | |
1307 | * When it is contended we risk a lock inversion if we were to | |
1308 | * block waiting for the lock. Luckily, the __blkdev_get() | |
1309 | * function allows us to return -ERESTARTSYS which will result in | |
1310 | * bdev->bd_mutex being dropped, reacquired, and fops->open() being | |
1311 | * called again. This process can be repeated safely until both | |
1312 | * locks are acquired. | |
1313 | */ | |
1314 | if (!mutex_owned(&spa_namespace_lock)) { | |
1315 | locked = mutex_tryenter(&spa_namespace_lock); | |
1316 | if (!locked) | |
1317 | return (-SET_ERROR(ERESTARTSYS)); | |
1318 | } | |
040dab99 | 1319 | |
163a8c28 TC |
1320 | ro = (readonly || (strchr(zv->zv_name, '@') != NULL)); |
1321 | error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, ro, B_TRUE, zv, &os); | |
040dab99 | 1322 | if (error) |
07783588 | 1323 | goto out_mutex; |
040dab99 CC |
1324 | |
1325 | zv->zv_objset = os; | |
1326 | ||
1327 | error = zvol_setup_zv(zv); | |
1328 | ||
1329 | if (error) { | |
b5256303 | 1330 | dmu_objset_disown(os, 1, zv); |
040dab99 CC |
1331 | zv->zv_objset = NULL; |
1332 | } | |
1333 | ||
07783588 BP |
1334 | out_mutex: |
1335 | if (locked) | |
1336 | mutex_exit(&spa_namespace_lock); | |
040dab99 CC |
1337 | return (SET_ERROR(-error)); |
1338 | } | |
1339 | ||
1340 | static void | |
1341 | zvol_last_close(zvol_state_t *zv) | |
1342 | { | |
58404a73 BP |
1343 | ASSERT(RW_READ_HELD(&zv->zv_suspend_lock)); |
1344 | ASSERT(MUTEX_HELD(&zv->zv_state_lock)); | |
1345 | ||
040dab99 CC |
1346 | zvol_shutdown_zv(zv); |
1347 | ||
b5256303 | 1348 | dmu_objset_disown(zv->zv_objset, 1, zv); |
60101509 BB |
1349 | zv->zv_objset = NULL; |
1350 | } | |
1351 | ||
1352 | static int | |
1353 | zvol_open(struct block_device *bdev, fmode_t flag) | |
1354 | { | |
5428dc51 | 1355 | zvol_state_t *zv; |
58404a73 | 1356 | int error = 0; |
5146d802 | 1357 | boolean_t drop_suspend = B_TRUE; |
60101509 | 1358 | |
7b98f0d9 | 1359 | rw_enter(&zvol_state_lock, RW_READER); |
5428dc51 | 1360 | /* |
58404a73 BP |
1361 | * Obtain a copy of private_data under the zvol_state_lock to make |
1362 | * sure that either the result of zvol free code path setting | |
5428dc51 BP |
1363 | * bdev->bd_disk->private_data to NULL is observed, or zvol_free() |
1364 | * is not called on this zv because of the positive zv_open_count. | |
1365 | */ | |
1366 | zv = bdev->bd_disk->private_data; | |
1367 | if (zv == NULL) { | |
7b98f0d9 | 1368 | rw_exit(&zvol_state_lock); |
5559ba09 | 1369 | return (SET_ERROR(-ENXIO)); |
5428dc51 | 1370 | } |
58404a73 | 1371 | |
5559ba09 | 1372 | mutex_enter(&zv->zv_state_lock); |
58404a73 BP |
1373 | /* |
1374 | * make sure zvol is not suspended during first open | |
5146d802 BP |
1375 | * (hold zv_suspend_lock) and respect proper lock acquisition |
1376 | * ordering - zv_suspend_lock before zv_state_lock | |
58404a73 | 1377 | */ |
60101509 | 1378 | if (zv->zv_open_count == 0) { |
5146d802 BP |
1379 | if (!rw_tryenter(&zv->zv_suspend_lock, RW_READER)) { |
1380 | mutex_exit(&zv->zv_state_lock); | |
1381 | rw_enter(&zv->zv_suspend_lock, RW_READER); | |
1382 | mutex_enter(&zv->zv_state_lock); | |
1383 | /* check to see if zv_suspend_lock is needed */ | |
1384 | if (zv->zv_open_count != 0) { | |
1385 | rw_exit(&zv->zv_suspend_lock); | |
1386 | drop_suspend = B_FALSE; | |
1387 | } | |
1388 | } | |
58404a73 | 1389 | } else { |
5146d802 | 1390 | drop_suspend = B_FALSE; |
58404a73 | 1391 | } |
7b98f0d9 | 1392 | rw_exit(&zvol_state_lock); |
040dab99 | 1393 | |
5146d802 BP |
1394 | ASSERT(MUTEX_HELD(&zv->zv_state_lock)); |
1395 | ASSERT(zv->zv_open_count != 0 || RW_READ_HELD(&zv->zv_suspend_lock)); | |
1396 | ||
58404a73 | 1397 | if (zv->zv_open_count == 0) { |
163a8c28 | 1398 | error = zvol_first_open(zv, !(flag & FMODE_WRITE)); |
60101509 BB |
1399 | if (error) |
1400 | goto out_mutex; | |
1401 | } | |
1402 | ||
163a8c28 | 1403 | if ((flag & FMODE_WRITE) && (zv->zv_flags & ZVOL_RDONLY)) { |
60101509 BB |
1404 | error = -EROFS; |
1405 | goto out_open_count; | |
1406 | } | |
1407 | ||
1408 | zv->zv_open_count++; | |
1409 | ||
7b98f0d9 BB |
1410 | mutex_exit(&zv->zv_state_lock); |
1411 | if (drop_suspend) | |
1412 | rw_exit(&zv->zv_suspend_lock); | |
1413 | ||
5428dc51 BP |
1414 | check_disk_change(bdev); |
1415 | ||
7b98f0d9 BB |
1416 | return (0); |
1417 | ||
60101509 BB |
1418 | out_open_count: |
1419 | if (zv->zv_open_count == 0) | |
1420 | zvol_last_close(zv); | |
7b98f0d9 | 1421 | |
60101509 | 1422 | out_mutex: |
58404a73 | 1423 | mutex_exit(&zv->zv_state_lock); |
040dab99 CC |
1424 | if (drop_suspend) |
1425 | rw_exit(&zv->zv_suspend_lock); | |
94b25662 AB |
1426 | if (error == -ERESTARTSYS) |
1427 | schedule(); | |
60101509 | 1428 | |
ce37ebd2 | 1429 | return (SET_ERROR(error)); |
60101509 BB |
1430 | } |
1431 | ||
a1d9543a CD |
1432 | #ifdef HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID |
1433 | static void | |
1434 | #else | |
60101509 | 1435 | static int |
a1d9543a | 1436 | #endif |
60101509 BB |
1437 | zvol_release(struct gendisk *disk, fmode_t mode) |
1438 | { | |
5559ba09 | 1439 | zvol_state_t *zv; |
5146d802 | 1440 | boolean_t drop_suspend = B_TRUE; |
60101509 | 1441 | |
7b98f0d9 | 1442 | rw_enter(&zvol_state_lock, RW_READER); |
5559ba09 | 1443 | zv = disk->private_data; |
58404a73 | 1444 | |
5559ba09 | 1445 | mutex_enter(&zv->zv_state_lock); |
5146d802 | 1446 | ASSERT(zv->zv_open_count > 0); |
58404a73 BP |
1447 | /* |
1448 | * make sure zvol is not suspended during last close | |
5146d802 BP |
1449 | * (hold zv_suspend_lock) and respect proper lock acquisition |
1450 | * ordering - zv_suspend_lock before zv_state_lock | |
58404a73 | 1451 | */ |
5146d802 BP |
1452 | if (zv->zv_open_count == 1) { |
1453 | if (!rw_tryenter(&zv->zv_suspend_lock, RW_READER)) { | |
1454 | mutex_exit(&zv->zv_state_lock); | |
1455 | rw_enter(&zv->zv_suspend_lock, RW_READER); | |
1456 | mutex_enter(&zv->zv_state_lock); | |
1457 | /* check to see if zv_suspend_lock is needed */ | |
1458 | if (zv->zv_open_count != 1) { | |
1459 | rw_exit(&zv->zv_suspend_lock); | |
1460 | drop_suspend = B_FALSE; | |
1461 | } | |
1462 | } | |
1463 | } else { | |
1464 | drop_suspend = B_FALSE; | |
1465 | } | |
7b98f0d9 | 1466 | rw_exit(&zvol_state_lock); |
5146d802 BP |
1467 | |
1468 | ASSERT(MUTEX_HELD(&zv->zv_state_lock)); | |
1469 | ASSERT(zv->zv_open_count != 1 || RW_READ_HELD(&zv->zv_suspend_lock)); | |
040dab99 | 1470 | |
5428dc51 | 1471 | zv->zv_open_count--; |
58404a73 | 1472 | if (zv->zv_open_count == 0) |
5428dc51 | 1473 | zvol_last_close(zv); |
60101509 | 1474 | |
5559ba09 | 1475 | mutex_exit(&zv->zv_state_lock); |
60101509 | 1476 | |
58404a73 BP |
1477 | if (drop_suspend) |
1478 | rw_exit(&zv->zv_suspend_lock); | |
1479 | ||
a1d9543a | 1480 | #ifndef HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID |
60101509 | 1481 | return (0); |
a1d9543a | 1482 | #endif |
60101509 BB |
1483 | } |
1484 | ||
1485 | static int | |
1486 | zvol_ioctl(struct block_device *bdev, fmode_t mode, | |
ce37ebd2 | 1487 | unsigned int cmd, unsigned long arg) |
60101509 BB |
1488 | { |
1489 | zvol_state_t *zv = bdev->bd_disk->private_data; | |
1490 | int error = 0; | |
1491 | ||
7b98f0d9 | 1492 | ASSERT3U(zv->zv_open_count, >, 0); |
60101509 BB |
1493 | |
1494 | switch (cmd) { | |
1495 | case BLKFLSBUF: | |
ef1bdf36 BB |
1496 | fsync_bdev(bdev); |
1497 | invalidate_bdev(bdev); | |
1498 | rw_enter(&zv->zv_suspend_lock, RW_READER); | |
1499 | ||
47ab01a1 | 1500 | if (!(zv->zv_flags & ZVOL_RDONLY)) |
ef1bdf36 BB |
1501 | txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); |
1502 | ||
1503 | rw_exit(&zv->zv_suspend_lock); | |
60101509 | 1504 | break; |
ef1bdf36 | 1505 | |
4c0d8e50 | 1506 | case BLKZNAME: |
5559ba09 | 1507 | mutex_enter(&zv->zv_state_lock); |
4c0d8e50 | 1508 | error = copy_to_user((void *)arg, zv->zv_name, MAXNAMELEN); |
5559ba09 | 1509 | mutex_exit(&zv->zv_state_lock); |
4c0d8e50 | 1510 | break; |
60101509 BB |
1511 | |
1512 | default: | |
1513 | error = -ENOTTY; | |
1514 | break; | |
60101509 BB |
1515 | } |
1516 | ||
ce37ebd2 | 1517 | return (SET_ERROR(error)); |
60101509 BB |
1518 | } |
1519 | ||
1520 | #ifdef CONFIG_COMPAT | |
1521 | static int | |
1522 | zvol_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
ce37ebd2 | 1523 | unsigned cmd, unsigned long arg) |
60101509 | 1524 | { |
ce37ebd2 | 1525 | return (zvol_ioctl(bdev, mode, cmd, arg)); |
60101509 BB |
1526 | } |
1527 | #else | |
ce37ebd2 | 1528 | #define zvol_compat_ioctl NULL |
60101509 BB |
1529 | #endif |
1530 | ||
7b98f0d9 BB |
1531 | /* |
1532 | * Linux 2.6.38 preferred interface. | |
1533 | */ | |
1534 | #ifdef HAVE_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS | |
1535 | static unsigned int | |
1536 | zvol_check_events(struct gendisk *disk, unsigned int clearing) | |
1537 | { | |
1538 | unsigned int mask = 0; | |
1539 | ||
1540 | rw_enter(&zvol_state_lock, RW_READER); | |
1541 | ||
1542 | zvol_state_t *zv = disk->private_data; | |
1543 | if (zv != NULL) { | |
1544 | mutex_enter(&zv->zv_state_lock); | |
1545 | mask = zv->zv_changed ? DISK_EVENT_MEDIA_CHANGE : 0; | |
1546 | zv->zv_changed = 0; | |
1547 | mutex_exit(&zv->zv_state_lock); | |
1548 | } | |
1549 | ||
1550 | rw_exit(&zvol_state_lock); | |
1551 | ||
1552 | return (mask); | |
1553 | } | |
1554 | #else | |
60101509 BB |
1555 | static int zvol_media_changed(struct gendisk *disk) |
1556 | { | |
7b98f0d9 BB |
1557 | int changed = 0; |
1558 | ||
1559 | rw_enter(&zvol_state_lock, RW_READER); | |
1560 | ||
60101509 | 1561 | zvol_state_t *zv = disk->private_data; |
7b98f0d9 BB |
1562 | if (zv != NULL) { |
1563 | mutex_enter(&zv->zv_state_lock); | |
1564 | changed = zv->zv_changed; | |
1565 | zv->zv_changed = 0; | |
1566 | mutex_exit(&zv->zv_state_lock); | |
1567 | } | |
60101509 | 1568 | |
7b98f0d9 | 1569 | rw_exit(&zvol_state_lock); |
5428dc51 | 1570 | |
7b98f0d9 | 1571 | return (changed); |
60101509 | 1572 | } |
7b98f0d9 | 1573 | #endif |
60101509 BB |
1574 | |
1575 | static int zvol_revalidate_disk(struct gendisk *disk) | |
1576 | { | |
7b98f0d9 | 1577 | rw_enter(&zvol_state_lock, RW_READER); |
60101509 | 1578 | |
7b98f0d9 BB |
1579 | zvol_state_t *zv = disk->private_data; |
1580 | if (zv != NULL) { | |
1581 | mutex_enter(&zv->zv_state_lock); | |
1582 | set_capacity(zv->zv_disk, zv->zv_volsize >> SECTOR_BITS); | |
1583 | mutex_exit(&zv->zv_state_lock); | |
1584 | } | |
5428dc51 | 1585 | |
7b98f0d9 | 1586 | rw_exit(&zvol_state_lock); |
60101509 | 1587 | |
ce37ebd2 | 1588 | return (0); |
60101509 BB |
1589 | } |
1590 | ||
1591 | /* | |
1592 | * Provide a simple virtual geometry for legacy compatibility. For devices | |
1593 | * smaller than 1 MiB a small head and sector count is used to allow very | |
1594 | * tiny devices. For devices over 1 Mib a standard head and sector count | |
1595 | * is used to keep the cylinders count reasonable. | |
1596 | */ | |
1597 | static int | |
1598 | zvol_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
1599 | { | |
1600 | zvol_state_t *zv = bdev->bd_disk->private_data; | |
5428dc51 BP |
1601 | sector_t sectors; |
1602 | ||
7b98f0d9 | 1603 | ASSERT3U(zv->zv_open_count, >, 0); |
5428dc51 BP |
1604 | |
1605 | sectors = get_capacity(zv->zv_disk); | |
60101509 BB |
1606 | |
1607 | if (sectors > 2048) { | |
1608 | geo->heads = 16; | |
1609 | geo->sectors = 63; | |
1610 | } else { | |
1611 | geo->heads = 2; | |
1612 | geo->sectors = 4; | |
1613 | } | |
1614 | ||
1615 | geo->start = 0; | |
1616 | geo->cylinders = sectors / (geo->heads * geo->sectors); | |
1617 | ||
ce37ebd2 | 1618 | return (0); |
60101509 BB |
1619 | } |
1620 | ||
1621 | static struct kobject * | |
1622 | zvol_probe(dev_t dev, int *part, void *arg) | |
1623 | { | |
1624 | zvol_state_t *zv; | |
1625 | struct kobject *kobj; | |
1626 | ||
60101509 | 1627 | zv = zvol_find_by_dev(dev); |
dd3e1e30 | 1628 | kobj = zv ? get_disk_and_module(zv->zv_disk) : NULL; |
58404a73 BP |
1629 | ASSERT(zv == NULL || MUTEX_HELD(&zv->zv_state_lock)); |
1630 | if (zv) | |
1631 | mutex_exit(&zv->zv_state_lock); | |
60101509 | 1632 | |
ce37ebd2 | 1633 | return (kobj); |
60101509 BB |
1634 | } |
1635 | ||
60101509 | 1636 | static struct block_device_operations zvol_ops = { |
ce37ebd2 BB |
1637 | .open = zvol_open, |
1638 | .release = zvol_release, | |
1639 | .ioctl = zvol_ioctl, | |
1640 | .compat_ioctl = zvol_compat_ioctl, | |
7b98f0d9 BB |
1641 | #ifdef HAVE_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS |
1642 | .check_events = zvol_check_events, | |
ce37ebd2 | 1643 | #else |
ce37ebd2 | 1644 | .media_changed = zvol_media_changed, |
7b98f0d9 | 1645 | #endif |
ce37ebd2 BB |
1646 | .revalidate_disk = zvol_revalidate_disk, |
1647 | .getgeo = zvol_getgeo, | |
1648 | .owner = THIS_MODULE, | |
60101509 | 1649 | }; |
60101509 BB |
1650 | |
1651 | /* | |
1652 | * Allocate memory for a new zvol_state_t and setup the required | |
1653 | * request queue and generic disk structures for the block device. | |
1654 | */ | |
1655 | static zvol_state_t * | |
1656 | zvol_alloc(dev_t dev, const char *name) | |
1657 | { | |
1658 | zvol_state_t *zv; | |
cf8738d8 | 1659 | uint64_t volmode; |
1660 | ||
1661 | if (dsl_prop_get_integer(name, "volmode", &volmode, NULL) != 0) | |
1662 | return (NULL); | |
1663 | ||
1664 | if (volmode == ZFS_VOLMODE_DEFAULT) | |
1665 | volmode = zvol_volmode; | |
60101509 | 1666 | |
c7a7601c | 1667 | if (volmode == ZFS_VOLMODE_NONE) |
1668 | return (NULL); | |
1669 | ||
79c76d5b | 1670 | zv = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); |
60101509 | 1671 | |
2a3871d4 RY |
1672 | list_link_init(&zv->zv_next); |
1673 | ||
5559ba09 BP |
1674 | mutex_init(&zv->zv_state_lock, NULL, MUTEX_DEFAULT, NULL); |
1675 | ||
37f9dac5 | 1676 | zv->zv_queue = blk_alloc_queue(GFP_ATOMIC); |
60101509 BB |
1677 | if (zv->zv_queue == NULL) |
1678 | goto out_kmem; | |
1679 | ||
37f9dac5 | 1680 | blk_queue_make_request(zv->zv_queue, zvol_request); |
cf41432c | 1681 | blk_queue_set_write_cache(zv->zv_queue, B_TRUE, B_TRUE); |
b18019d2 | 1682 | |
bc17f104 RY |
1683 | /* Limit read-ahead to a single page to prevent over-prefetching. */ |
1684 | blk_queue_set_read_ahead(zv->zv_queue, 1); | |
1685 | ||
5731140e | 1686 | /* Disable write merging in favor of the ZIO pipeline. */ |
10f88c5c | 1687 | blk_queue_flag_set(QUEUE_FLAG_NOMERGES, zv->zv_queue); |
5731140e | 1688 | |
60101509 BB |
1689 | zv->zv_disk = alloc_disk(ZVOL_MINORS); |
1690 | if (zv->zv_disk == NULL) | |
1691 | goto out_queue; | |
1692 | ||
1693 | zv->zv_queue->queuedata = zv; | |
1694 | zv->zv_dev = dev; | |
1695 | zv->zv_open_count = 0; | |
4c0d8e50 | 1696 | strlcpy(zv->zv_name, name, MAXNAMELEN); |
60101509 | 1697 | |
5d43cc9a | 1698 | rangelock_init(&zv->zv_rangelock, NULL, NULL); |
040dab99 | 1699 | rw_init(&zv->zv_suspend_lock, NULL, RW_DEFAULT, NULL); |
3c4988c8 | 1700 | |
60101509 | 1701 | zv->zv_disk->major = zvol_major; |
7b98f0d9 BB |
1702 | #ifdef HAVE_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS |
1703 | zv->zv_disk->events = DISK_EVENT_MEDIA_CHANGE; | |
1704 | #endif | |
1705 | ||
cf8738d8 | 1706 | if (volmode == ZFS_VOLMODE_DEV) { |
1707 | /* | |
1708 | * ZFS_VOLMODE_DEV disable partitioning on ZVOL devices: set | |
1709 | * gendisk->minors = 1 as noted in include/linux/genhd.h. | |
1710 | * Also disable extended partition numbers (GENHD_FL_EXT_DEVT) | |
1711 | * and suppresses partition scanning (GENHD_FL_NO_PART_SCAN) | |
1712 | * setting gendisk->flags accordingly. | |
1713 | */ | |
1714 | zv->zv_disk->minors = 1; | |
1715 | #if defined(GENHD_FL_EXT_DEVT) | |
1716 | zv->zv_disk->flags &= ~GENHD_FL_EXT_DEVT; | |
1717 | #endif | |
1718 | #if defined(GENHD_FL_NO_PART_SCAN) | |
1719 | zv->zv_disk->flags |= GENHD_FL_NO_PART_SCAN; | |
1720 | #endif | |
1721 | } | |
60101509 BB |
1722 | zv->zv_disk->first_minor = (dev & MINORMASK); |
1723 | zv->zv_disk->fops = &zvol_ops; | |
1724 | zv->zv_disk->private_data = zv; | |
1725 | zv->zv_disk->queue = zv->zv_queue; | |
4c0d8e50 FN |
1726 | snprintf(zv->zv_disk->disk_name, DISK_NAME_LEN, "%s%d", |
1727 | ZVOL_DEV_NAME, (dev & MINORMASK)); | |
60101509 | 1728 | |
ce37ebd2 | 1729 | return (zv); |
60101509 BB |
1730 | |
1731 | out_queue: | |
1732 | blk_cleanup_queue(zv->zv_queue); | |
1733 | out_kmem: | |
1734 | kmem_free(zv, sizeof (zvol_state_t)); | |
0a6bef26 | 1735 | |
ce37ebd2 | 1736 | return (NULL); |
60101509 BB |
1737 | } |
1738 | ||
1739 | /* | |
5559ba09 BP |
1740 | * Cleanup then free a zvol_state_t which was created by zvol_alloc(). |
1741 | * At this time, the structure is not opened by anyone, is taken off | |
1742 | * the zvol_state_list, and has its private data set to NULL. | |
1743 | * The zvol_state_lock is dropped. | |
60101509 BB |
1744 | */ |
1745 | static void | |
5559ba09 | 1746 | zvol_free(void *arg) |
60101509 | 1747 | { |
899662e3 | 1748 | zvol_state_t *zv = arg; |
5559ba09 | 1749 | |
58404a73 BP |
1750 | ASSERT(!RW_LOCK_HELD(&zv->zv_suspend_lock)); |
1751 | ASSERT(!MUTEX_HELD(&zv->zv_state_lock)); | |
5428dc51 | 1752 | ASSERT(zv->zv_open_count == 0); |
5559ba09 | 1753 | ASSERT(zv->zv_disk->private_data == NULL); |
5428dc51 | 1754 | |
040dab99 | 1755 | rw_destroy(&zv->zv_suspend_lock); |
5d43cc9a | 1756 | rangelock_fini(&zv->zv_rangelock); |
60101509 BB |
1757 | |
1758 | del_gendisk(zv->zv_disk); | |
1759 | blk_cleanup_queue(zv->zv_queue); | |
1760 | put_disk(zv->zv_disk); | |
1761 | ||
d45e010d | 1762 | ida_simple_remove(&zvol_ida, MINOR(zv->zv_dev) >> ZVOL_MINOR_BITS); |
60101509 | 1763 | |
5559ba09 | 1764 | mutex_destroy(&zv->zv_state_lock); |
a448a255 | 1765 | dataset_kstats_destroy(&zv->zv_kstat); |
5559ba09 BP |
1766 | |
1767 | kmem_free(zv, sizeof (zvol_state_t)); | |
899662e3 CC |
1768 | } |
1769 | ||
a0bd735a BP |
1770 | /* |
1771 | * Create a block device minor node and setup the linkage between it | |
1772 | * and the specified volume. Once this function returns the block | |
1773 | * device is live and ready for use. | |
1774 | */ | |
60101509 | 1775 | static int |
a0bd735a | 1776 | zvol_create_minor_impl(const char *name) |
60101509 BB |
1777 | { |
1778 | zvol_state_t *zv; | |
1779 | objset_t *os; | |
1780 | dmu_object_info_t *doi; | |
1781 | uint64_t volsize; | |
9965059a | 1782 | uint64_t len; |
60101509 BB |
1783 | unsigned minor = 0; |
1784 | int error = 0; | |
d45e010d CC |
1785 | int idx; |
1786 | uint64_t hash = zvol_name_hash(name); | |
1787 | ||
cf8738d8 | 1788 | if (zvol_inhibit_dev) |
1789 | return (0); | |
1790 | ||
d45e010d CC |
1791 | idx = ida_simple_get(&zvol_ida, 0, 0, kmem_flags_convert(KM_SLEEP)); |
1792 | if (idx < 0) | |
1793 | return (SET_ERROR(-idx)); | |
1794 | minor = idx << ZVOL_MINOR_BITS; | |
60101509 | 1795 | |
58404a73 | 1796 | zv = zvol_find_by_name_hash(name, hash, RW_NONE); |
60101509 | 1797 | if (zv) { |
58404a73 BP |
1798 | ASSERT(MUTEX_HELD(&zv->zv_state_lock)); |
1799 | mutex_exit(&zv->zv_state_lock); | |
2d82116e | 1800 | ida_simple_remove(&zvol_ida, idx); |
5559ba09 | 1801 | return (SET_ERROR(EEXIST)); |
60101509 BB |
1802 | } |
1803 | ||
79c76d5b | 1804 | doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP); |
60101509 | 1805 | |
b5256303 | 1806 | error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, B_TRUE, FTAG, &os); |
60101509 BB |
1807 | if (error) |
1808 | goto out_doi; | |
1809 | ||
1810 | error = dmu_object_info(os, ZVOL_OBJ, doi); | |
1811 | if (error) | |
1812 | goto out_dmu_objset_disown; | |
1813 | ||
1814 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); | |
1815 | if (error) | |
1816 | goto out_dmu_objset_disown; | |
1817 | ||
60101509 BB |
1818 | zv = zvol_alloc(MKDEV(zvol_major, minor), name); |
1819 | if (zv == NULL) { | |
2e528b49 | 1820 | error = SET_ERROR(EAGAIN); |
60101509 BB |
1821 | goto out_dmu_objset_disown; |
1822 | } | |
d45e010d | 1823 | zv->zv_hash = hash; |
60101509 BB |
1824 | |
1825 | if (dmu_objset_is_snapshot(os)) | |
1826 | zv->zv_flags |= ZVOL_RDONLY; | |
1827 | ||
1828 | zv->zv_volblocksize = doi->doi_data_block_size; | |
1829 | zv->zv_volsize = volsize; | |
1830 | zv->zv_objset = os; | |
1831 | ||
1832 | set_capacity(zv->zv_disk, zv->zv_volsize >> 9); | |
1833 | ||
c495fe2c | 1834 | blk_queue_max_hw_sectors(zv->zv_queue, (DMU_MAX_ACCESS / 4) >> 9); |
34037afe ED |
1835 | blk_queue_max_segments(zv->zv_queue, UINT16_MAX); |
1836 | blk_queue_max_segment_size(zv->zv_queue, UINT_MAX); | |
1837 | blk_queue_physical_block_size(zv->zv_queue, zv->zv_volblocksize); | |
1838 | blk_queue_io_opt(zv->zv_queue, zv->zv_volblocksize); | |
7c0e5708 ED |
1839 | blk_queue_max_discard_sectors(zv->zv_queue, |
1840 | (zvol_max_discard_blocks * zv->zv_volblocksize) >> 9); | |
ee5fd0bb | 1841 | blk_queue_discard_granularity(zv->zv_queue, zv->zv_volblocksize); |
10f88c5c | 1842 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, zv->zv_queue); |
37f9dac5 | 1843 | #ifdef QUEUE_FLAG_NONROT |
10f88c5c | 1844 | blk_queue_flag_set(QUEUE_FLAG_NONROT, zv->zv_queue); |
34037afe | 1845 | #endif |
c6a3a222 | 1846 | #ifdef QUEUE_FLAG_ADD_RANDOM |
10f88c5c | 1847 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, zv->zv_queue); |
c6a3a222 | 1848 | #endif |
34037afe | 1849 | |
a4430fce GW |
1850 | if (spa_writeable(dmu_objset_spa(os))) { |
1851 | if (zil_replay_disable) | |
1852 | zil_destroy(dmu_objset_zil(os), B_FALSE); | |
1853 | else | |
1854 | zil_replay(os, zv, zvol_replay_vector); | |
1855 | } | |
a448a255 SD |
1856 | ASSERT3P(zv->zv_kstat.dk_kstats, ==, NULL); |
1857 | dataset_kstats_create(&zv->zv_kstat, zv->zv_objset); | |
60101509 | 1858 | |
9965059a BB |
1859 | /* |
1860 | * When udev detects the addition of the device it will immediately | |
1861 | * invoke blkid(8) to determine the type of content on the device. | |
1862 | * Prefetching the blocks commonly scanned by blkid(8) will speed | |
1863 | * up this process. | |
1864 | */ | |
1865 | len = MIN(MAX(zvol_prefetch_bytes, 0), SPA_MAXBLOCKSIZE); | |
1866 | if (len > 0) { | |
fcff0f35 PD |
1867 | dmu_prefetch(os, ZVOL_OBJ, 0, 0, len, ZIO_PRIORITY_SYNC_READ); |
1868 | dmu_prefetch(os, ZVOL_OBJ, 0, volsize - len, len, | |
02730c33 | 1869 | ZIO_PRIORITY_SYNC_READ); |
9965059a BB |
1870 | } |
1871 | ||
f74a147c | 1872 | zv->zv_objset = NULL; |
60101509 | 1873 | out_dmu_objset_disown: |
b5256303 | 1874 | dmu_objset_disown(os, B_TRUE, FTAG); |
60101509 | 1875 | out_doi: |
ce37ebd2 | 1876 | kmem_free(doi, sizeof (dmu_object_info_t)); |
60101509 BB |
1877 | |
1878 | if (error == 0) { | |
7b98f0d9 | 1879 | rw_enter(&zvol_state_lock, RW_WRITER); |
60101509 | 1880 | zvol_insert(zv); |
7b98f0d9 | 1881 | rw_exit(&zvol_state_lock); |
60101509 | 1882 | add_disk(zv->zv_disk); |
a0bd735a | 1883 | } else { |
d45e010d | 1884 | ida_simple_remove(&zvol_ida, idx); |
60101509 BB |
1885 | } |
1886 | ||
ce37ebd2 | 1887 | return (SET_ERROR(error)); |
60101509 BB |
1888 | } |
1889 | ||
ba6a2402 BB |
1890 | /* |
1891 | * Rename a block device minor mode for the specified volume. | |
1892 | */ | |
1893 | static void | |
a0bd735a | 1894 | zvol_rename_minor(zvol_state_t *zv, const char *newname) |
ba6a2402 BB |
1895 | { |
1896 | int readonly = get_disk_ro(zv->zv_disk); | |
1897 | ||
7b98f0d9 | 1898 | ASSERT(RW_LOCK_HELD(&zvol_state_lock)); |
58404a73 | 1899 | ASSERT(MUTEX_HELD(&zv->zv_state_lock)); |
ba6a2402 BB |
1900 | |
1901 | strlcpy(zv->zv_name, newname, sizeof (zv->zv_name)); | |
040dab99 CC |
1902 | |
1903 | /* move to new hashtable entry */ | |
1904 | zv->zv_hash = zvol_name_hash(zv->zv_name); | |
1905 | hlist_del(&zv->zv_hlink); | |
1906 | hlist_add_head(&zv->zv_hlink, ZVOL_HT_HEAD(zv->zv_hash)); | |
ba6a2402 BB |
1907 | |
1908 | /* | |
1909 | * The block device's read-only state is briefly changed causing | |
1910 | * a KOBJ_CHANGE uevent to be issued. This ensures udev detects | |
1911 | * the name change and fixes the symlinks. This does not change | |
1912 | * ZVOL_RDONLY in zv->zv_flags so the actual read-only state never | |
1913 | * changes. This would normally be done using kobject_uevent() but | |
1914 | * that is a GPL-only symbol which is why we need this workaround. | |
1915 | */ | |
1916 | set_disk_ro(zv->zv_disk, !readonly); | |
1917 | set_disk_ro(zv->zv_disk, readonly); | |
1918 | } | |
1919 | ||
7ac557ce CC |
1920 | typedef struct minors_job { |
1921 | list_t *list; | |
1922 | list_node_t link; | |
1923 | /* input */ | |
1924 | char *name; | |
1925 | /* output */ | |
1926 | int error; | |
1927 | } minors_job_t; | |
1928 | ||
1929 | /* | |
1930 | * Prefetch zvol dnodes for the minors_job | |
1931 | */ | |
1932 | static void | |
1933 | zvol_prefetch_minors_impl(void *arg) | |
1934 | { | |
1935 | minors_job_t *job = arg; | |
1936 | char *dsname = job->name; | |
1937 | objset_t *os = NULL; | |
1938 | ||
b5256303 TC |
1939 | job->error = dmu_objset_own(dsname, DMU_OST_ZVOL, B_TRUE, B_TRUE, |
1940 | FTAG, &os); | |
7ac557ce CC |
1941 | if (job->error == 0) { |
1942 | dmu_prefetch(os, ZVOL_OBJ, 0, 0, 0, ZIO_PRIORITY_SYNC_READ); | |
b5256303 | 1943 | dmu_objset_disown(os, B_TRUE, FTAG); |
7ac557ce CC |
1944 | } |
1945 | } | |
a0bd735a BP |
1946 | |
1947 | /* | |
1948 | * Mask errors to continue dmu_objset_find() traversal | |
1949 | */ | |
1950 | static int | |
1951 | zvol_create_snap_minor_cb(const char *dsname, void *arg) | |
1952 | { | |
7ac557ce CC |
1953 | minors_job_t *j = arg; |
1954 | list_t *minors_list = j->list; | |
1955 | const char *name = j->name; | |
a0bd735a | 1956 | |
1ee159f4 BP |
1957 | ASSERT0(MUTEX_HELD(&spa_namespace_lock)); |
1958 | ||
a0bd735a BP |
1959 | /* skip the designated dataset */ |
1960 | if (name && strcmp(dsname, name) == 0) | |
1961 | return (0); | |
1962 | ||
1963 | /* at this point, the dsname should name a snapshot */ | |
1964 | if (strchr(dsname, '@') == 0) { | |
1965 | dprintf("zvol_create_snap_minor_cb(): " | |
02730c33 | 1966 | "%s is not a shapshot name\n", dsname); |
a0bd735a | 1967 | } else { |
7ac557ce CC |
1968 | minors_job_t *job; |
1969 | char *n = strdup(dsname); | |
1970 | if (n == NULL) | |
1971 | return (0); | |
1972 | ||
1973 | job = kmem_alloc(sizeof (minors_job_t), KM_SLEEP); | |
1974 | job->name = n; | |
1975 | job->list = minors_list; | |
1976 | job->error = 0; | |
1977 | list_insert_tail(minors_list, job); | |
1978 | /* don't care if dispatch fails, because job->error is 0 */ | |
1979 | taskq_dispatch(system_taskq, zvol_prefetch_minors_impl, job, | |
1980 | TQ_SLEEP); | |
a0bd735a BP |
1981 | } |
1982 | ||
1983 | return (0); | |
1984 | } | |
1985 | ||
1986 | /* | |
1987 | * Mask errors to continue dmu_objset_find() traversal | |
1988 | */ | |
60101509 | 1989 | static int |
13fe0198 | 1990 | zvol_create_minors_cb(const char *dsname, void *arg) |
60101509 | 1991 | { |
a0bd735a BP |
1992 | uint64_t snapdev; |
1993 | int error; | |
7ac557ce | 1994 | list_t *minors_list = arg; |
a0bd735a | 1995 | |
1ee159f4 BP |
1996 | ASSERT0(MUTEX_HELD(&spa_namespace_lock)); |
1997 | ||
a0bd735a BP |
1998 | error = dsl_prop_get_integer(dsname, "snapdev", &snapdev, NULL); |
1999 | if (error) | |
2000 | return (0); | |
2001 | ||
2002 | /* | |
2003 | * Given the name and the 'snapdev' property, create device minor nodes | |
2004 | * with the linkages to zvols/snapshots as needed. | |
2005 | * If the name represents a zvol, create a minor node for the zvol, then | |
2006 | * check if its snapshots are 'visible', and if so, iterate over the | |
2007 | * snapshots and create device minor nodes for those. | |
2008 | */ | |
2009 | if (strchr(dsname, '@') == 0) { | |
7ac557ce CC |
2010 | minors_job_t *job; |
2011 | char *n = strdup(dsname); | |
2012 | if (n == NULL) | |
2013 | return (0); | |
2014 | ||
2015 | job = kmem_alloc(sizeof (minors_job_t), KM_SLEEP); | |
2016 | job->name = n; | |
2017 | job->list = minors_list; | |
2018 | job->error = 0; | |
2019 | list_insert_tail(minors_list, job); | |
2020 | /* don't care if dispatch fails, because job->error is 0 */ | |
2021 | taskq_dispatch(system_taskq, zvol_prefetch_minors_impl, job, | |
2022 | TQ_SLEEP); | |
2023 | ||
2024 | if (snapdev == ZFS_SNAPDEV_VISIBLE) { | |
a0bd735a BP |
2025 | /* |
2026 | * traverse snapshots only, do not traverse children, | |
2027 | * and skip the 'dsname' | |
2028 | */ | |
2029 | error = dmu_objset_find((char *)dsname, | |
7ac557ce | 2030 | zvol_create_snap_minor_cb, (void *)job, |
a0bd735a | 2031 | DS_FIND_SNAPSHOTS); |
a0bd735a BP |
2032 | } |
2033 | } else { | |
2034 | dprintf("zvol_create_minors_cb(): %s is not a zvol name\n", | |
02730c33 | 2035 | dsname); |
a0bd735a | 2036 | } |
60101509 | 2037 | |
d5674448 | 2038 | return (0); |
60101509 BB |
2039 | } |
2040 | ||
2041 | /* | |
a0bd735a BP |
2042 | * Create minors for the specified dataset, including children and snapshots. |
2043 | * Pay attention to the 'snapdev' property and iterate over the snapshots | |
2044 | * only if they are 'visible'. This approach allows one to assure that the | |
2045 | * snapshot metadata is read from disk only if it is needed. | |
2046 | * | |
2047 | * The name can represent a dataset to be recursively scanned for zvols and | |
2048 | * their snapshots, or a single zvol snapshot. If the name represents a | |
2049 | * dataset, the scan is performed in two nested stages: | |
2050 | * - scan the dataset for zvols, and | |
2051 | * - for each zvol, create a minor node, then check if the zvol's snapshots | |
2052 | * are 'visible', and only then iterate over the snapshots if needed | |
2053 | * | |
4e33ba4c | 2054 | * If the name represents a snapshot, a check is performed if the snapshot is |
a0bd735a BP |
2055 | * 'visible' (which also verifies that the parent is a zvol), and if so, |
2056 | * a minor node for that snapshot is created. | |
60101509 | 2057 | */ |
a0bd735a BP |
2058 | static int |
2059 | zvol_create_minors_impl(const char *name) | |
60101509 | 2060 | { |
60101509 | 2061 | int error = 0; |
5428dc51 | 2062 | fstrans_cookie_t cookie; |
a0bd735a | 2063 | char *atp, *parent; |
7ac557ce CC |
2064 | list_t minors_list; |
2065 | minors_job_t *job; | |
60101509 | 2066 | |
5428dc51 BP |
2067 | if (zvol_inhibit_dev) |
2068 | return (0); | |
2069 | ||
7ac557ce CC |
2070 | /* |
2071 | * This is the list for prefetch jobs. Whenever we found a match | |
2072 | * during dmu_objset_find, we insert a minors_job to the list and do | |
2073 | * taskq_dispatch to parallel prefetch zvol dnodes. Note we don't need | |
2074 | * any lock because all list operation is done on the current thread. | |
2075 | * | |
2076 | * We will use this list to do zvol_create_minor_impl after prefetch | |
2077 | * so we don't have to traverse using dmu_objset_find again. | |
2078 | */ | |
2079 | list_create(&minors_list, sizeof (minors_job_t), | |
2080 | offsetof(minors_job_t, link)); | |
2081 | ||
a0bd735a BP |
2082 | parent = kmem_alloc(MAXPATHLEN, KM_SLEEP); |
2083 | (void) strlcpy(parent, name, MAXPATHLEN); | |
2084 | ||
2085 | if ((atp = strrchr(parent, '@')) != NULL) { | |
2086 | uint64_t snapdev; | |
2087 | ||
2088 | *atp = '\0'; | |
2089 | error = dsl_prop_get_integer(parent, "snapdev", | |
2090 | &snapdev, NULL); | |
2091 | ||
2092 | if (error == 0 && snapdev == ZFS_SNAPDEV_VISIBLE) | |
2093 | error = zvol_create_minor_impl(name); | |
2094 | } else { | |
2095 | cookie = spl_fstrans_mark(); | |
2096 | error = dmu_objset_find(parent, zvol_create_minors_cb, | |
7ac557ce | 2097 | &minors_list, DS_FIND_CHILDREN); |
a0bd735a BP |
2098 | spl_fstrans_unmark(cookie); |
2099 | } | |
2100 | ||
2101 | kmem_free(parent, MAXPATHLEN); | |
7ac557ce CC |
2102 | taskq_wait_outstanding(system_taskq, 0); |
2103 | ||
2104 | /* | |
2105 | * Prefetch is completed, we can do zvol_create_minor_impl | |
2106 | * sequentially. | |
2107 | */ | |
2108 | while ((job = list_head(&minors_list)) != NULL) { | |
2109 | list_remove(&minors_list, job); | |
2110 | if (!job->error) | |
2111 | zvol_create_minor_impl(job->name); | |
2112 | strfree(job->name); | |
2113 | kmem_free(job, sizeof (minors_job_t)); | |
2114 | } | |
2115 | ||
2116 | list_destroy(&minors_list); | |
ba6a2402 BB |
2117 | |
2118 | return (SET_ERROR(error)); | |
2119 | } | |
2120 | ||
2121 | /* | |
2122 | * Remove minors for specified dataset including children and snapshots. | |
2123 | */ | |
a0bd735a BP |
2124 | static void |
2125 | zvol_remove_minors_impl(const char *name) | |
ba6a2402 BB |
2126 | { |
2127 | zvol_state_t *zv, *zv_next; | |
2128 | int namelen = ((name) ? strlen(name) : 0); | |
899662e3 | 2129 | taskqid_t t, tid = TASKQID_INVALID; |
5559ba09 | 2130 | list_t free_list; |
ba6a2402 | 2131 | |
74497b7a | 2132 | if (zvol_inhibit_dev) |
ba6a2402 | 2133 | return; |
74497b7a | 2134 | |
5559ba09 BP |
2135 | list_create(&free_list, sizeof (zvol_state_t), |
2136 | offsetof(zvol_state_t, zv_next)); | |
2137 | ||
7b98f0d9 | 2138 | rw_enter(&zvol_state_lock, RW_WRITER); |
ba6a2402 BB |
2139 | |
2140 | for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { | |
2141 | zv_next = list_next(&zvol_state_list, zv); | |
2142 | ||
58404a73 | 2143 | mutex_enter(&zv->zv_state_lock); |
ba6a2402 BB |
2144 | if (name == NULL || strcmp(zv->zv_name, name) == 0 || |
2145 | (strncmp(zv->zv_name, name, namelen) == 0 && | |
5428dc51 BP |
2146 | (zv->zv_name[namelen] == '/' || |
2147 | zv->zv_name[namelen] == '@'))) { | |
5559ba09 | 2148 | /* |
58404a73 | 2149 | * By holding zv_state_lock here, we guarantee that no |
5559ba09 BP |
2150 | * one is currently using this zv |
2151 | */ | |
97f8d796 | 2152 | |
2153 | /* If in use, leave alone */ | |
2154 | if (zv->zv_open_count > 0 || | |
2155 | atomic_read(&zv->zv_suspend_ref)) { | |
2156 | mutex_exit(&zv->zv_state_lock); | |
2157 | continue; | |
2158 | } | |
2159 | ||
ba6a2402 | 2160 | zvol_remove(zv); |
899662e3 | 2161 | |
58404a73 | 2162 | /* |
7b98f0d9 BB |
2163 | * Cleared while holding zvol_state_lock as a writer |
2164 | * which will prevent zvol_open() from opening it. | |
58404a73 | 2165 | */ |
899662e3 CC |
2166 | zv->zv_disk->private_data = NULL; |
2167 | ||
97f8d796 | 2168 | /* Drop zv_state_lock before zvol_free() */ |
2169 | mutex_exit(&zv->zv_state_lock); | |
2170 | ||
7b98f0d9 | 2171 | /* Try parallel zv_free, if failed do it in place */ |
5559ba09 | 2172 | t = taskq_dispatch(system_taskq, zvol_free, zv, |
899662e3 CC |
2173 | TQ_SLEEP); |
2174 | if (t == TASKQID_INVALID) | |
5559ba09 | 2175 | list_insert_head(&free_list, zv); |
899662e3 CC |
2176 | else |
2177 | tid = t; | |
58404a73 BP |
2178 | } else { |
2179 | mutex_exit(&zv->zv_state_lock); | |
60101509 | 2180 | } |
60101509 | 2181 | } |
7b98f0d9 | 2182 | rw_exit(&zvol_state_lock); |
5559ba09 | 2183 | |
7b98f0d9 | 2184 | /* Drop zvol_state_lock before calling zvol_free() */ |
5559ba09 BP |
2185 | while ((zv = list_head(&free_list)) != NULL) { |
2186 | list_remove(&free_list, zv); | |
2187 | zvol_free(zv); | |
2188 | } | |
2189 | ||
899662e3 CC |
2190 | if (tid != TASKQID_INVALID) |
2191 | taskq_wait_outstanding(system_taskq, tid); | |
60101509 BB |
2192 | } |
2193 | ||
cf8738d8 | 2194 | /* Remove minor for this specific volume only */ |
a0bd735a BP |
2195 | static void |
2196 | zvol_remove_minor_impl(const char *name) | |
2197 | { | |
92aceb2a | 2198 | zvol_state_t *zv = NULL, *zv_next; |
a0bd735a BP |
2199 | |
2200 | if (zvol_inhibit_dev) | |
2201 | return; | |
2202 | ||
7b98f0d9 | 2203 | rw_enter(&zvol_state_lock, RW_WRITER); |
a0bd735a BP |
2204 | |
2205 | for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { | |
2206 | zv_next = list_next(&zvol_state_list, zv); | |
2207 | ||
58404a73 | 2208 | mutex_enter(&zv->zv_state_lock); |
a0bd735a | 2209 | if (strcmp(zv->zv_name, name) == 0) { |
5559ba09 | 2210 | /* |
58404a73 | 2211 | * By holding zv_state_lock here, we guarantee that no |
5559ba09 BP |
2212 | * one is currently using this zv |
2213 | */ | |
97f8d796 | 2214 | |
2215 | /* If in use, leave alone */ | |
2216 | if (zv->zv_open_count > 0 || | |
2217 | atomic_read(&zv->zv_suspend_ref)) { | |
2218 | mutex_exit(&zv->zv_state_lock); | |
2219 | continue; | |
2220 | } | |
a0bd735a | 2221 | zvol_remove(zv); |
97f8d796 | 2222 | |
7b98f0d9 BB |
2223 | /* |
2224 | * Cleared while holding zvol_state_lock as a writer | |
2225 | * which will prevent zvol_open() from opening it. | |
2226 | */ | |
5559ba09 | 2227 | zv->zv_disk->private_data = NULL; |
97f8d796 | 2228 | |
2229 | mutex_exit(&zv->zv_state_lock); | |
a0bd735a | 2230 | break; |
58404a73 BP |
2231 | } else { |
2232 | mutex_exit(&zv->zv_state_lock); | |
a0bd735a BP |
2233 | } |
2234 | } | |
2235 | ||
92aceb2a | 2236 | /* Drop zvol_state_lock before calling zvol_free() */ |
7b98f0d9 | 2237 | rw_exit(&zvol_state_lock); |
5559ba09 | 2238 | |
92aceb2a | 2239 | if (zv != NULL) |
2240 | zvol_free(zv); | |
a0bd735a BP |
2241 | } |
2242 | ||
60101509 | 2243 | /* |
ba6a2402 | 2244 | * Rename minors for specified dataset including children and snapshots. |
60101509 | 2245 | */ |
a0bd735a BP |
2246 | static void |
2247 | zvol_rename_minors_impl(const char *oldname, const char *newname) | |
60101509 BB |
2248 | { |
2249 | zvol_state_t *zv, *zv_next; | |
ba6a2402 | 2250 | int oldnamelen, newnamelen; |
60101509 | 2251 | |
74497b7a DH |
2252 | if (zvol_inhibit_dev) |
2253 | return; | |
2254 | ||
ba6a2402 BB |
2255 | oldnamelen = strlen(oldname); |
2256 | newnamelen = strlen(newname); | |
60101509 | 2257 | |
7b98f0d9 | 2258 | rw_enter(&zvol_state_lock, RW_READER); |
ba6a2402 | 2259 | |
60101509 BB |
2260 | for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { |
2261 | zv_next = list_next(&zvol_state_list, zv); | |
2262 | ||
58404a73 BP |
2263 | mutex_enter(&zv->zv_state_lock); |
2264 | ||
5428dc51 | 2265 | /* If in use, leave alone */ |
58404a73 BP |
2266 | if (zv->zv_open_count > 0) { |
2267 | mutex_exit(&zv->zv_state_lock); | |
5428dc51 | 2268 | continue; |
58404a73 | 2269 | } |
5428dc51 | 2270 | |
ba6a2402 | 2271 | if (strcmp(zv->zv_name, oldname) == 0) { |
a0bd735a | 2272 | zvol_rename_minor(zv, newname); |
ba6a2402 BB |
2273 | } else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 && |
2274 | (zv->zv_name[oldnamelen] == '/' || | |
2275 | zv->zv_name[oldnamelen] == '@')) { | |
682ce104 | 2276 | char *name = kmem_asprintf("%s%c%s", newname, |
ba6a2402 BB |
2277 | zv->zv_name[oldnamelen], |
2278 | zv->zv_name + oldnamelen + 1); | |
a0bd735a | 2279 | zvol_rename_minor(zv, name); |
b5d69358 | 2280 | strfree(name); |
60101509 | 2281 | } |
58404a73 BP |
2282 | |
2283 | mutex_exit(&zv->zv_state_lock); | |
60101509 | 2284 | } |
ba6a2402 | 2285 | |
7b98f0d9 | 2286 | rw_exit(&zvol_state_lock); |
60101509 BB |
2287 | } |
2288 | ||
a0bd735a BP |
2289 | typedef struct zvol_snapdev_cb_arg { |
2290 | uint64_t snapdev; | |
2291 | } zvol_snapdev_cb_arg_t; | |
2292 | ||
0b4d1b58 | 2293 | static int |
4ea3f864 GM |
2294 | zvol_set_snapdev_cb(const char *dsname, void *param) |
2295 | { | |
a0bd735a | 2296 | zvol_snapdev_cb_arg_t *arg = param; |
0b4d1b58 ED |
2297 | |
2298 | if (strchr(dsname, '@') == NULL) | |
ba6a2402 | 2299 | return (0); |
0b4d1b58 | 2300 | |
a0bd735a | 2301 | switch (arg->snapdev) { |
0b4d1b58 | 2302 | case ZFS_SNAPDEV_VISIBLE: |
a0bd735a | 2303 | (void) zvol_create_minor_impl(dsname); |
0b4d1b58 ED |
2304 | break; |
2305 | case ZFS_SNAPDEV_HIDDEN: | |
a0bd735a | 2306 | (void) zvol_remove_minor_impl(dsname); |
0b4d1b58 ED |
2307 | break; |
2308 | } | |
ba6a2402 BB |
2309 | |
2310 | return (0); | |
0b4d1b58 ED |
2311 | } |
2312 | ||
a0bd735a BP |
2313 | static void |
2314 | zvol_set_snapdev_impl(char *name, uint64_t snapdev) | |
2315 | { | |
2316 | zvol_snapdev_cb_arg_t arg = {snapdev}; | |
2317 | fstrans_cookie_t cookie = spl_fstrans_mark(); | |
2318 | /* | |
2319 | * The zvol_set_snapdev_sync() sets snapdev appropriately | |
2320 | * in the dataset hierarchy. Here, we only scan snapshots. | |
2321 | */ | |
2322 | dmu_objset_find(name, zvol_set_snapdev_cb, &arg, DS_FIND_SNAPSHOTS); | |
2323 | spl_fstrans_unmark(cookie); | |
2324 | } | |
2325 | ||
cf8738d8 | 2326 | typedef struct zvol_volmode_cb_arg { |
2327 | uint64_t volmode; | |
2328 | } zvol_volmode_cb_arg_t; | |
2329 | ||
2330 | static void | |
2331 | zvol_set_volmode_impl(char *name, uint64_t volmode) | |
2332 | { | |
2333 | fstrans_cookie_t cookie = spl_fstrans_mark(); | |
2334 | ||
2335 | if (strchr(name, '@') != NULL) | |
2336 | return; | |
2337 | ||
2338 | /* | |
2339 | * It's unfortunate we need to remove minors before we create new ones: | |
2340 | * this is necessary because our backing gendisk (zvol_state->zv_disk) | |
2341 | * coule be different when we set, for instance, volmode from "geom" | |
2342 | * to "dev" (or vice versa). | |
2343 | * A possible optimization is to modify our consumers so we don't get | |
2344 | * called when "volmode" does not change. | |
2345 | */ | |
2346 | switch (volmode) { | |
2347 | case ZFS_VOLMODE_NONE: | |
2348 | (void) zvol_remove_minor_impl(name); | |
2349 | break; | |
2350 | case ZFS_VOLMODE_GEOM: | |
2351 | case ZFS_VOLMODE_DEV: | |
2352 | (void) zvol_remove_minor_impl(name); | |
2353 | (void) zvol_create_minor_impl(name); | |
2354 | break; | |
2355 | case ZFS_VOLMODE_DEFAULT: | |
2356 | (void) zvol_remove_minor_impl(name); | |
2357 | if (zvol_volmode == ZFS_VOLMODE_NONE) | |
2358 | break; | |
2359 | else /* if zvol_volmode is invalid defaults to "geom" */ | |
2360 | (void) zvol_create_minor_impl(name); | |
2361 | break; | |
2362 | } | |
2363 | ||
2364 | spl_fstrans_unmark(cookie); | |
2365 | } | |
2366 | ||
a0bd735a BP |
2367 | static zvol_task_t * |
2368 | zvol_task_alloc(zvol_async_op_t op, const char *name1, const char *name2, | |
cf8738d8 | 2369 | uint64_t value) |
a0bd735a BP |
2370 | { |
2371 | zvol_task_t *task; | |
2372 | char *delim; | |
2373 | ||
2374 | /* Never allow tasks on hidden names. */ | |
2375 | if (name1[0] == '$') | |
2376 | return (NULL); | |
2377 | ||
2378 | task = kmem_zalloc(sizeof (zvol_task_t), KM_SLEEP); | |
2379 | task->op = op; | |
cf8738d8 | 2380 | task->value = value; |
a0bd735a BP |
2381 | delim = strchr(name1, '/'); |
2382 | strlcpy(task->pool, name1, delim ? (delim - name1 + 1) : MAXNAMELEN); | |
2383 | ||
2384 | strlcpy(task->name1, name1, MAXNAMELEN); | |
2385 | if (name2 != NULL) | |
2386 | strlcpy(task->name2, name2, MAXNAMELEN); | |
2387 | ||
2388 | return (task); | |
2389 | } | |
2390 | ||
2391 | static void | |
2392 | zvol_task_free(zvol_task_t *task) | |
2393 | { | |
2394 | kmem_free(task, sizeof (zvol_task_t)); | |
2395 | } | |
2396 | ||
2397 | /* | |
2398 | * The worker thread function performed asynchronously. | |
2399 | */ | |
2400 | static void | |
2401 | zvol_task_cb(void *param) | |
2402 | { | |
2403 | zvol_task_t *task = (zvol_task_t *)param; | |
2404 | ||
2405 | switch (task->op) { | |
2406 | case ZVOL_ASYNC_CREATE_MINORS: | |
2407 | (void) zvol_create_minors_impl(task->name1); | |
2408 | break; | |
2409 | case ZVOL_ASYNC_REMOVE_MINORS: | |
2410 | zvol_remove_minors_impl(task->name1); | |
2411 | break; | |
2412 | case ZVOL_ASYNC_RENAME_MINORS: | |
2413 | zvol_rename_minors_impl(task->name1, task->name2); | |
2414 | break; | |
2415 | case ZVOL_ASYNC_SET_SNAPDEV: | |
cf8738d8 | 2416 | zvol_set_snapdev_impl(task->name1, task->value); |
2417 | break; | |
2418 | case ZVOL_ASYNC_SET_VOLMODE: | |
2419 | zvol_set_volmode_impl(task->name1, task->value); | |
a0bd735a BP |
2420 | break; |
2421 | default: | |
2422 | VERIFY(0); | |
2423 | break; | |
2424 | } | |
2425 | ||
2426 | zvol_task_free(task); | |
2427 | } | |
2428 | ||
cf8738d8 | 2429 | typedef struct zvol_set_prop_int_arg { |
a0bd735a BP |
2430 | const char *zsda_name; |
2431 | uint64_t zsda_value; | |
2432 | zprop_source_t zsda_source; | |
2433 | dmu_tx_t *zsda_tx; | |
cf8738d8 | 2434 | } zvol_set_prop_int_arg_t; |
a0bd735a BP |
2435 | |
2436 | /* | |
2437 | * Sanity check the dataset for safe use by the sync task. No additional | |
2438 | * conditions are imposed. | |
2439 | */ | |
2440 | static int | |
2441 | zvol_set_snapdev_check(void *arg, dmu_tx_t *tx) | |
2442 | { | |
cf8738d8 | 2443 | zvol_set_prop_int_arg_t *zsda = arg; |
a0bd735a BP |
2444 | dsl_pool_t *dp = dmu_tx_pool(tx); |
2445 | dsl_dir_t *dd; | |
2446 | int error; | |
2447 | ||
2448 | error = dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL); | |
2449 | if (error != 0) | |
2450 | return (error); | |
2451 | ||
2452 | dsl_dir_rele(dd, FTAG); | |
2453 | ||
2454 | return (error); | |
2455 | } | |
2456 | ||
92aceb2a | 2457 | /* ARGSUSED */ |
a0bd735a BP |
2458 | static int |
2459 | zvol_set_snapdev_sync_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) | |
2460 | { | |
a0bd735a BP |
2461 | char dsname[MAXNAMELEN]; |
2462 | zvol_task_t *task; | |
92aceb2a | 2463 | uint64_t snapdev; |
a0bd735a BP |
2464 | |
2465 | dsl_dataset_name(ds, dsname); | |
92aceb2a | 2466 | if (dsl_prop_get_int_ds(ds, "snapdev", &snapdev) != 0) |
2467 | return (0); | |
2468 | task = zvol_task_alloc(ZVOL_ASYNC_SET_SNAPDEV, dsname, NULL, snapdev); | |
a0bd735a BP |
2469 | if (task == NULL) |
2470 | return (0); | |
2471 | ||
2472 | (void) taskq_dispatch(dp->dp_spa->spa_zvol_taskq, zvol_task_cb, | |
02730c33 | 2473 | task, TQ_SLEEP); |
a0bd735a BP |
2474 | return (0); |
2475 | } | |
2476 | ||
2477 | /* | |
92aceb2a | 2478 | * Traverse all child datasets and apply snapdev appropriately. |
2479 | * We call dsl_prop_set_sync_impl() here to set the value only on the toplevel | |
2480 | * dataset and read the effective "snapdev" on every child in the callback | |
2481 | * function: this is because the value is not guaranteed to be the same in the | |
2482 | * whole dataset hierarchy. | |
a0bd735a BP |
2483 | */ |
2484 | static void | |
2485 | zvol_set_snapdev_sync(void *arg, dmu_tx_t *tx) | |
2486 | { | |
cf8738d8 | 2487 | zvol_set_prop_int_arg_t *zsda = arg; |
a0bd735a BP |
2488 | dsl_pool_t *dp = dmu_tx_pool(tx); |
2489 | dsl_dir_t *dd; | |
92aceb2a | 2490 | dsl_dataset_t *ds; |
2491 | int error; | |
a0bd735a BP |
2492 | |
2493 | VERIFY0(dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL)); | |
2494 | zsda->zsda_tx = tx; | |
2495 | ||
92aceb2a | 2496 | error = dsl_dataset_hold(dp, zsda->zsda_name, FTAG, &ds); |
2497 | if (error == 0) { | |
2498 | dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_SNAPDEV), | |
2499 | zsda->zsda_source, sizeof (zsda->zsda_value), 1, | |
2500 | &zsda->zsda_value, zsda->zsda_tx); | |
2501 | dsl_dataset_rele(ds, FTAG); | |
2502 | } | |
a0bd735a BP |
2503 | dmu_objset_find_dp(dp, dd->dd_object, zvol_set_snapdev_sync_cb, |
2504 | zsda, DS_FIND_CHILDREN); | |
2505 | ||
2506 | dsl_dir_rele(dd, FTAG); | |
2507 | } | |
2508 | ||
0b4d1b58 | 2509 | int |
a0bd735a BP |
2510 | zvol_set_snapdev(const char *ddname, zprop_source_t source, uint64_t snapdev) |
2511 | { | |
cf8738d8 | 2512 | zvol_set_prop_int_arg_t zsda; |
5428dc51 | 2513 | |
a0bd735a BP |
2514 | zsda.zsda_name = ddname; |
2515 | zsda.zsda_source = source; | |
2516 | zsda.zsda_value = snapdev; | |
5428dc51 | 2517 | |
a0bd735a BP |
2518 | return (dsl_sync_task(ddname, zvol_set_snapdev_check, |
2519 | zvol_set_snapdev_sync, &zsda, 0, ZFS_SPACE_CHECK_NONE)); | |
2520 | } | |
2521 | ||
cf8738d8 | 2522 | /* |
2523 | * Sanity check the dataset for safe use by the sync task. No additional | |
2524 | * conditions are imposed. | |
2525 | */ | |
2526 | static int | |
2527 | zvol_set_volmode_check(void *arg, dmu_tx_t *tx) | |
2528 | { | |
2529 | zvol_set_prop_int_arg_t *zsda = arg; | |
2530 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
2531 | dsl_dir_t *dd; | |
2532 | int error; | |
2533 | ||
2534 | error = dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL); | |
2535 | if (error != 0) | |
2536 | return (error); | |
2537 | ||
2538 | dsl_dir_rele(dd, FTAG); | |
2539 | ||
2540 | return (error); | |
2541 | } | |
2542 | ||
2543 | /* ARGSUSED */ | |
2544 | static int | |
2545 | zvol_set_volmode_sync_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) | |
2546 | { | |
2547 | char dsname[MAXNAMELEN]; | |
2548 | zvol_task_t *task; | |
2549 | uint64_t volmode; | |
2550 | ||
2551 | dsl_dataset_name(ds, dsname); | |
2552 | if (dsl_prop_get_int_ds(ds, "volmode", &volmode) != 0) | |
2553 | return (0); | |
2554 | task = zvol_task_alloc(ZVOL_ASYNC_SET_VOLMODE, dsname, NULL, volmode); | |
2555 | if (task == NULL) | |
2556 | return (0); | |
2557 | ||
2558 | (void) taskq_dispatch(dp->dp_spa->spa_zvol_taskq, zvol_task_cb, | |
2559 | task, TQ_SLEEP); | |
2560 | return (0); | |
2561 | } | |
2562 | ||
2563 | /* | |
2564 | * Traverse all child datasets and apply volmode appropriately. | |
2565 | * We call dsl_prop_set_sync_impl() here to set the value only on the toplevel | |
2566 | * dataset and read the effective "volmode" on every child in the callback | |
2567 | * function: this is because the value is not guaranteed to be the same in the | |
2568 | * whole dataset hierarchy. | |
2569 | */ | |
2570 | static void | |
2571 | zvol_set_volmode_sync(void *arg, dmu_tx_t *tx) | |
2572 | { | |
2573 | zvol_set_prop_int_arg_t *zsda = arg; | |
2574 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
2575 | dsl_dir_t *dd; | |
2576 | dsl_dataset_t *ds; | |
2577 | int error; | |
2578 | ||
2579 | VERIFY0(dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL)); | |
2580 | zsda->zsda_tx = tx; | |
2581 | ||
2582 | error = dsl_dataset_hold(dp, zsda->zsda_name, FTAG, &ds); | |
2583 | if (error == 0) { | |
2584 | dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_VOLMODE), | |
2585 | zsda->zsda_source, sizeof (zsda->zsda_value), 1, | |
2586 | &zsda->zsda_value, zsda->zsda_tx); | |
2587 | dsl_dataset_rele(ds, FTAG); | |
2588 | } | |
2589 | ||
2590 | dmu_objset_find_dp(dp, dd->dd_object, zvol_set_volmode_sync_cb, | |
2591 | zsda, DS_FIND_CHILDREN); | |
2592 | ||
2593 | dsl_dir_rele(dd, FTAG); | |
2594 | } | |
2595 | ||
2596 | int | |
2597 | zvol_set_volmode(const char *ddname, zprop_source_t source, uint64_t volmode) | |
2598 | { | |
2599 | zvol_set_prop_int_arg_t zsda; | |
2600 | ||
2601 | zsda.zsda_name = ddname; | |
2602 | zsda.zsda_source = source; | |
2603 | zsda.zsda_value = volmode; | |
2604 | ||
2605 | return (dsl_sync_task(ddname, zvol_set_volmode_check, | |
2606 | zvol_set_volmode_sync, &zsda, 0, ZFS_SPACE_CHECK_NONE)); | |
2607 | } | |
2608 | ||
a0bd735a BP |
2609 | void |
2610 | zvol_create_minors(spa_t *spa, const char *name, boolean_t async) | |
2611 | { | |
2612 | zvol_task_t *task; | |
2613 | taskqid_t id; | |
2614 | ||
2615 | task = zvol_task_alloc(ZVOL_ASYNC_CREATE_MINORS, name, NULL, ~0ULL); | |
2616 | if (task == NULL) | |
2617 | return; | |
2618 | ||
2619 | id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP); | |
48d3eb40 | 2620 | if ((async == B_FALSE) && (id != TASKQID_INVALID)) |
a0bd735a BP |
2621 | taskq_wait_id(spa->spa_zvol_taskq, id); |
2622 | } | |
2623 | ||
2624 | void | |
2625 | zvol_remove_minors(spa_t *spa, const char *name, boolean_t async) | |
2626 | { | |
2627 | zvol_task_t *task; | |
2628 | taskqid_t id; | |
2629 | ||
2630 | task = zvol_task_alloc(ZVOL_ASYNC_REMOVE_MINORS, name, NULL, ~0ULL); | |
2631 | if (task == NULL) | |
2632 | return; | |
5428dc51 | 2633 | |
a0bd735a | 2634 | id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP); |
48d3eb40 | 2635 | if ((async == B_FALSE) && (id != TASKQID_INVALID)) |
a0bd735a BP |
2636 | taskq_wait_id(spa->spa_zvol_taskq, id); |
2637 | } | |
2638 | ||
2639 | void | |
2640 | zvol_rename_minors(spa_t *spa, const char *name1, const char *name2, | |
2641 | boolean_t async) | |
2642 | { | |
2643 | zvol_task_t *task; | |
2644 | taskqid_t id; | |
2645 | ||
2646 | task = zvol_task_alloc(ZVOL_ASYNC_RENAME_MINORS, name1, name2, ~0ULL); | |
2647 | if (task == NULL) | |
2648 | return; | |
2649 | ||
2650 | id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP); | |
48d3eb40 | 2651 | if ((async == B_FALSE) && (id != TASKQID_INVALID)) |
a0bd735a | 2652 | taskq_wait_id(spa->spa_zvol_taskq, id); |
0b4d1b58 ED |
2653 | } |
2654 | ||
60101509 BB |
2655 | int |
2656 | zvol_init(void) | |
2657 | { | |
692e55b8 | 2658 | int threads = MIN(MAX(zvol_threads, 1), 1024); |
d45e010d | 2659 | int i, error; |
60101509 | 2660 | |
2a3871d4 | 2661 | list_create(&zvol_state_list, sizeof (zvol_state_t), |
ce37ebd2 | 2662 | offsetof(zvol_state_t, zv_next)); |
7b98f0d9 | 2663 | rw_init(&zvol_state_lock, NULL, RW_DEFAULT, NULL); |
4a5d7f82 | 2664 | ida_init(&zvol_ida); |
2a3871d4 | 2665 | |
692e55b8 CC |
2666 | zvol_taskq = taskq_create(ZVOL_DRIVER, threads, maxclsyspri, |
2667 | threads * 2, INT_MAX, TASKQ_PREPOPULATE | TASKQ_DYNAMIC); | |
2668 | if (zvol_taskq == NULL) { | |
2669 | printk(KERN_INFO "ZFS: taskq_create() failed\n"); | |
2670 | error = -ENOMEM; | |
2671 | goto out; | |
2672 | } | |
2673 | ||
d45e010d CC |
2674 | zvol_htable = kmem_alloc(ZVOL_HT_SIZE * sizeof (struct hlist_head), |
2675 | KM_SLEEP); | |
2676 | if (!zvol_htable) { | |
692e55b8 CC |
2677 | error = -ENOMEM; |
2678 | goto out_taskq; | |
d45e010d CC |
2679 | } |
2680 | for (i = 0; i < ZVOL_HT_SIZE; i++) | |
2681 | INIT_HLIST_HEAD(&zvol_htable[i]); | |
2682 | ||
60101509 BB |
2683 | error = register_blkdev(zvol_major, ZVOL_DRIVER); |
2684 | if (error) { | |
2685 | printk(KERN_INFO "ZFS: register_blkdev() failed %d\n", error); | |
d45e010d | 2686 | goto out_free; |
60101509 BB |
2687 | } |
2688 | ||
2689 | blk_register_region(MKDEV(zvol_major, 0), 1UL << MINORBITS, | |
ce37ebd2 | 2690 | THIS_MODULE, zvol_probe, NULL, NULL); |
60101509 | 2691 | |
60101509 | 2692 | return (0); |
2a3871d4 | 2693 | |
d45e010d CC |
2694 | out_free: |
2695 | kmem_free(zvol_htable, ZVOL_HT_SIZE * sizeof (struct hlist_head)); | |
692e55b8 CC |
2696 | out_taskq: |
2697 | taskq_destroy(zvol_taskq); | |
37f9dac5 | 2698 | out: |
8f7933fe | 2699 | ida_destroy(&zvol_ida); |
7b98f0d9 | 2700 | rw_destroy(&zvol_state_lock); |
2a3871d4 RY |
2701 | list_destroy(&zvol_state_list); |
2702 | ||
ce37ebd2 | 2703 | return (SET_ERROR(error)); |
60101509 BB |
2704 | } |
2705 | ||
2706 | void | |
2707 | zvol_fini(void) | |
2708 | { | |
a0bd735a BP |
2709 | zvol_remove_minors_impl(NULL); |
2710 | ||
60101509 BB |
2711 | blk_unregister_region(MKDEV(zvol_major, 0), 1UL << MINORBITS); |
2712 | unregister_blkdev(zvol_major, ZVOL_DRIVER); | |
d45e010d | 2713 | kmem_free(zvol_htable, ZVOL_HT_SIZE * sizeof (struct hlist_head)); |
a0bd735a | 2714 | |
692e55b8 | 2715 | taskq_destroy(zvol_taskq); |
60101509 | 2716 | list_destroy(&zvol_state_list); |
7b98f0d9 | 2717 | rw_destroy(&zvol_state_lock); |
f2d8bdc6 CC |
2718 | |
2719 | ida_destroy(&zvol_ida); | |
60101509 BB |
2720 | } |
2721 | ||
02730c33 | 2722 | /* BEGIN CSTYLED */ |
74497b7a DH |
2723 | module_param(zvol_inhibit_dev, uint, 0644); |
2724 | MODULE_PARM_DESC(zvol_inhibit_dev, "Do not create zvol device nodes"); | |
2725 | ||
30a9524e | 2726 | module_param(zvol_major, uint, 0444); |
60101509 BB |
2727 | MODULE_PARM_DESC(zvol_major, "Major number for zvol device"); |
2728 | ||
692e55b8 CC |
2729 | module_param(zvol_threads, uint, 0444); |
2730 | MODULE_PARM_DESC(zvol_threads, "Max number of threads to handle I/O requests"); | |
2731 | ||
2732 | module_param(zvol_request_sync, uint, 0644); | |
2733 | MODULE_PARM_DESC(zvol_request_sync, "Synchronously handle bio requests"); | |
2734 | ||
7c0e5708 | 2735 | module_param(zvol_max_discard_blocks, ulong, 0444); |
ce37ebd2 | 2736 | MODULE_PARM_DESC(zvol_max_discard_blocks, "Max number of blocks to discard"); |
9965059a BB |
2737 | |
2738 | module_param(zvol_prefetch_bytes, uint, 0644); | |
2739 | MODULE_PARM_DESC(zvol_prefetch_bytes, "Prefetch N bytes at zvol start+end"); | |
cf8738d8 | 2740 | |
2741 | module_param(zvol_volmode, uint, 0644); | |
2742 | MODULE_PARM_DESC(zvol_volmode, "Default volmode property value"); | |
02730c33 | 2743 | /* END CSTYLED */ |