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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. | |
4e820b5a AX |
36 | * |
37 | * Copyright (c) 2016 Actifio, Inc. All rights reserved. | |
60101509 BB |
38 | */ |
39 | ||
a08ee875 | 40 | #include <sys/dbuf.h> |
60101509 BB |
41 | #include <sys/dmu_traverse.h> |
42 | #include <sys/dsl_dataset.h> | |
43 | #include <sys/dsl_prop.h> | |
4e820b5a | 44 | #include <sys/dsl_dir.h> |
60101509 | 45 | #include <sys/zap.h> |
e10b0808 | 46 | #include <sys/zfeature.h> |
60101509 | 47 | #include <sys/zil_impl.h> |
4e820b5a | 48 | #include <sys/dmu_tx.h> |
60101509 BB |
49 | #include <sys/zio.h> |
50 | #include <sys/zfs_rlock.h> | |
51 | #include <sys/zfs_znode.h> | |
4e820b5a | 52 | #include <sys/spa_impl.h> |
60101509 | 53 | #include <sys/zvol.h> |
61e90960 | 54 | #include <linux/blkdev_compat.h> |
60101509 | 55 | |
74497b7a | 56 | unsigned int zvol_inhibit_dev = 0; |
60101509 | 57 | unsigned int zvol_major = ZVOL_MAJOR; |
e10b0808 | 58 | unsigned int zvol_prefetch_bytes = (128 * 1024); |
7c0e5708 | 59 | unsigned long zvol_max_discard_blocks = 16384; |
60101509 | 60 | |
60101509 BB |
61 | static kmutex_t zvol_state_lock; |
62 | static list_t zvol_state_list; | |
63 | static char *zvol_tag = "zvol_tag"; | |
64 | ||
65 | /* | |
66 | * The in-core state of each volume. | |
67 | */ | |
68 | typedef struct zvol_state { | |
4c0d8e50 | 69 | char zv_name[MAXNAMELEN]; /* name */ |
a08ee875 LG |
70 | uint64_t zv_volsize; /* advertised space */ |
71 | uint64_t zv_volblocksize; /* volume block size */ | |
60101509 BB |
72 | objset_t *zv_objset; /* objset handle */ |
73 | uint32_t zv_flags; /* ZVOL_* flags */ | |
74 | uint32_t zv_open_count; /* open counts */ | |
75 | uint32_t zv_changed; /* disk changed */ | |
76 | zilog_t *zv_zilog; /* ZIL handle */ | |
87dac73d | 77 | zfs_rlock_t zv_range_lock; /* range lock */ |
60101509 BB |
78 | dmu_buf_t *zv_dbuf; /* bonus handle */ |
79 | dev_t zv_dev; /* device id */ | |
80 | struct gendisk *zv_disk; /* generic disk */ | |
81 | struct request_queue *zv_queue; /* request queue */ | |
82 | spinlock_t zv_lock; /* request queue lock */ | |
83 | list_node_t zv_next; /* next zvol_state_t linkage */ | |
84 | } zvol_state_t; | |
85 | ||
4e820b5a AX |
86 | typedef enum { |
87 | ZVOL_ASYNC_CREATE_MINORS, | |
88 | ZVOL_ASYNC_REMOVE_MINORS, | |
89 | ZVOL_ASYNC_RENAME_MINORS, | |
90 | ZVOL_ASYNC_SET_SNAPDEV, | |
91 | ZVOL_ASYNC_MAX | |
92 | } zvol_async_op_t; | |
93 | ||
94 | typedef struct { | |
95 | zvol_async_op_t op; | |
96 | char pool[MAXNAMELEN]; | |
97 | char name1[MAXNAMELEN]; | |
98 | char name2[MAXNAMELEN]; | |
99 | zprop_source_t source; | |
100 | uint64_t snapdev; | |
101 | } zvol_task_t; | |
102 | ||
60101509 BB |
103 | #define ZVOL_RDONLY 0x1 |
104 | ||
105 | /* | |
106 | * Find the next available range of ZVOL_MINORS minor numbers. The | |
107 | * zvol_state_list is kept in ascending minor order so we simply need | |
108 | * to scan the list for the first gap in the sequence. This allows us | |
109 | * to recycle minor number as devices are created and removed. | |
110 | */ | |
111 | static int | |
112 | zvol_find_minor(unsigned *minor) | |
113 | { | |
114 | zvol_state_t *zv; | |
115 | ||
116 | *minor = 0; | |
117 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
118 | for (zv = list_head(&zvol_state_list); zv != NULL; | |
a08ee875 | 119 | zv = list_next(&zvol_state_list, zv), *minor += ZVOL_MINORS) { |
60101509 BB |
120 | if (MINOR(zv->zv_dev) != MINOR(*minor)) |
121 | break; | |
122 | } | |
123 | ||
124 | /* All minors are in use */ | |
125 | if (*minor >= (1 << MINORBITS)) | |
a08ee875 | 126 | return (SET_ERROR(ENXIO)); |
60101509 | 127 | |
a08ee875 | 128 | return (0); |
60101509 BB |
129 | } |
130 | ||
131 | /* | |
132 | * Find a zvol_state_t given the full major+minor dev_t. | |
133 | */ | |
134 | static zvol_state_t * | |
135 | zvol_find_by_dev(dev_t dev) | |
136 | { | |
137 | zvol_state_t *zv; | |
138 | ||
139 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
140 | for (zv = list_head(&zvol_state_list); zv != NULL; | |
a08ee875 | 141 | zv = list_next(&zvol_state_list, zv)) { |
60101509 | 142 | if (zv->zv_dev == dev) |
a08ee875 | 143 | return (zv); |
60101509 BB |
144 | } |
145 | ||
a08ee875 | 146 | return (NULL); |
60101509 BB |
147 | } |
148 | ||
149 | /* | |
150 | * Find a zvol_state_t given the name provided at zvol_alloc() time. | |
151 | */ | |
152 | static zvol_state_t * | |
153 | zvol_find_by_name(const char *name) | |
154 | { | |
155 | zvol_state_t *zv; | |
156 | ||
157 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
158 | for (zv = list_head(&zvol_state_list); zv != NULL; | |
a08ee875 LG |
159 | zv = list_next(&zvol_state_list, zv)) { |
160 | if (strncmp(zv->zv_name, name, MAXNAMELEN) == 0) | |
161 | return (zv); | |
60101509 BB |
162 | } |
163 | ||
a08ee875 | 164 | return (NULL); |
60101509 BB |
165 | } |
166 | ||
6c285672 JL |
167 | |
168 | /* | |
169 | * Given a path, return TRUE if path is a ZVOL. | |
170 | */ | |
171 | boolean_t | |
172 | zvol_is_zvol(const char *device) | |
173 | { | |
174 | struct block_device *bdev; | |
175 | unsigned int major; | |
176 | ||
68d83c55 | 177 | bdev = vdev_lookup_bdev(device); |
6c285672 JL |
178 | if (IS_ERR(bdev)) |
179 | return (B_FALSE); | |
180 | ||
181 | major = MAJOR(bdev->bd_dev); | |
182 | bdput(bdev); | |
183 | ||
184 | if (major == zvol_major) | |
a08ee875 | 185 | return (B_TRUE); |
6c285672 JL |
186 | |
187 | return (B_FALSE); | |
188 | } | |
189 | ||
60101509 BB |
190 | /* |
191 | * ZFS_IOC_CREATE callback handles dmu zvol and zap object creation. | |
192 | */ | |
193 | void | |
194 | zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) | |
195 | { | |
196 | zfs_creat_t *zct = arg; | |
197 | nvlist_t *nvprops = zct->zct_props; | |
198 | int error; | |
199 | uint64_t volblocksize, volsize; | |
200 | ||
201 | VERIFY(nvlist_lookup_uint64(nvprops, | |
202 | zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); | |
203 | if (nvlist_lookup_uint64(nvprops, | |
204 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) | |
205 | volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); | |
206 | ||
207 | /* | |
208 | * These properties must be removed from the list so the generic | |
209 | * property setting step won't apply to them. | |
210 | */ | |
211 | VERIFY(nvlist_remove_all(nvprops, | |
212 | zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); | |
213 | (void) nvlist_remove_all(nvprops, | |
214 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); | |
215 | ||
216 | error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, | |
217 | DMU_OT_NONE, 0, tx); | |
218 | ASSERT(error == 0); | |
219 | ||
220 | error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, | |
221 | DMU_OT_NONE, 0, tx); | |
222 | ASSERT(error == 0); | |
223 | ||
224 | error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); | |
225 | ASSERT(error == 0); | |
226 | } | |
227 | ||
228 | /* | |
229 | * ZFS_IOC_OBJSET_STATS entry point. | |
230 | */ | |
231 | int | |
232 | zvol_get_stats(objset_t *os, nvlist_t *nv) | |
233 | { | |
234 | int error; | |
235 | dmu_object_info_t *doi; | |
236 | uint64_t val; | |
237 | ||
238 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); | |
239 | if (error) | |
a08ee875 | 240 | return (SET_ERROR(error)); |
60101509 BB |
241 | |
242 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); | |
a08ee875 | 243 | doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP); |
60101509 BB |
244 | error = dmu_object_info(os, ZVOL_OBJ, doi); |
245 | ||
246 | if (error == 0) { | |
247 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, | |
248 | doi->doi_data_block_size); | |
249 | } | |
250 | ||
a08ee875 | 251 | kmem_free(doi, sizeof (dmu_object_info_t)); |
60101509 | 252 | |
a08ee875 LG |
253 | return (SET_ERROR(error)); |
254 | } | |
255 | ||
256 | static void | |
257 | zvol_size_changed(zvol_state_t *zv, uint64_t volsize) | |
258 | { | |
259 | struct block_device *bdev; | |
260 | ||
261 | bdev = bdget_disk(zv->zv_disk, 0); | |
262 | if (bdev == NULL) | |
263 | return; | |
264 | /* | |
265 | * 2.6.28 API change | |
266 | * Added check_disk_size_change() helper function. | |
267 | */ | |
268 | #ifdef HAVE_CHECK_DISK_SIZE_CHANGE | |
269 | set_capacity(zv->zv_disk, volsize >> 9); | |
270 | zv->zv_volsize = volsize; | |
271 | check_disk_size_change(zv->zv_disk, bdev); | |
272 | #else | |
273 | zv->zv_volsize = volsize; | |
274 | zv->zv_changed = 1; | |
275 | (void) check_disk_change(bdev); | |
276 | #endif /* HAVE_CHECK_DISK_SIZE_CHANGE */ | |
277 | ||
278 | bdput(bdev); | |
60101509 BB |
279 | } |
280 | ||
281 | /* | |
282 | * Sanity check volume size. | |
283 | */ | |
284 | int | |
285 | zvol_check_volsize(uint64_t volsize, uint64_t blocksize) | |
286 | { | |
287 | if (volsize == 0) | |
a08ee875 | 288 | return (SET_ERROR(EINVAL)); |
60101509 BB |
289 | |
290 | if (volsize % blocksize != 0) | |
a08ee875 | 291 | return (SET_ERROR(EINVAL)); |
60101509 BB |
292 | |
293 | #ifdef _ILP32 | |
294 | if (volsize - 1 > MAXOFFSET_T) | |
a08ee875 | 295 | return (SET_ERROR(EOVERFLOW)); |
60101509 BB |
296 | #endif |
297 | return (0); | |
298 | } | |
299 | ||
300 | /* | |
301 | * Ensure the zap is flushed then inform the VFS of the capacity change. | |
302 | */ | |
303 | static int | |
a08ee875 | 304 | zvol_update_volsize(uint64_t volsize, objset_t *os) |
60101509 | 305 | { |
60101509 BB |
306 | dmu_tx_t *tx; |
307 | int error; | |
308 | ||
309 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
310 | ||
df554c14 | 311 | tx = dmu_tx_create(os); |
60101509 BB |
312 | dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); |
313 | error = dmu_tx_assign(tx, TXG_WAIT); | |
314 | if (error) { | |
315 | dmu_tx_abort(tx); | |
a08ee875 | 316 | return (SET_ERROR(error)); |
60101509 BB |
317 | } |
318 | ||
df554c14 | 319 | error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, |
60101509 BB |
320 | &volsize, tx); |
321 | dmu_tx_commit(tx); | |
322 | ||
a08ee875 LG |
323 | if (error == 0) |
324 | error = dmu_free_long_range(os, | |
325 | ZVOL_OBJ, volsize, DMU_OBJECT_END); | |
60101509 | 326 | |
a08ee875 LG |
327 | return (error); |
328 | } | |
60101509 | 329 | |
a08ee875 LG |
330 | static int |
331 | zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize) | |
332 | { | |
333 | zvol_size_changed(zv, volsize); | |
60101509 | 334 | |
a08ee875 LG |
335 | /* |
336 | * We should post a event here describing the expansion. However, | |
337 | * the zfs_ereport_post() interface doesn't nicely support posting | |
338 | * events for zvols, it assumes events relate to vdevs or zios. | |
339 | */ | |
60101509 BB |
340 | |
341 | return (0); | |
342 | } | |
343 | ||
344 | /* | |
345 | * Set ZFS_PROP_VOLSIZE set entry point. | |
346 | */ | |
347 | int | |
348 | zvol_set_volsize(const char *name, uint64_t volsize) | |
349 | { | |
a08ee875 | 350 | zvol_state_t *zv = NULL; |
60101509 | 351 | objset_t *os = NULL; |
60101509 | 352 | int error; |
a08ee875 LG |
353 | dmu_object_info_t *doi; |
354 | uint64_t readonly; | |
355 | boolean_t owned = B_FALSE; | |
60101509 | 356 | |
a08ee875 LG |
357 | error = dsl_prop_get_integer(name, |
358 | zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); | |
359 | if (error != 0) | |
360 | return (SET_ERROR(error)); | |
361 | if (readonly) | |
362 | return (SET_ERROR(EROFS)); | |
60101509 | 363 | |
a08ee875 | 364 | mutex_enter(&zvol_state_lock); |
60101509 | 365 | zv = zvol_find_by_name(name); |
60101509 | 366 | |
a08ee875 LG |
367 | if (zv == NULL || zv->zv_objset == NULL) { |
368 | if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, | |
369 | FTAG, &os)) != 0) { | |
370 | mutex_exit(&zvol_state_lock); | |
371 | return (SET_ERROR(error)); | |
372 | } | |
373 | owned = B_TRUE; | |
374 | if (zv != NULL) | |
375 | zv->zv_objset = os; | |
376 | } else { | |
377 | os = zv->zv_objset; | |
378 | } | |
60101509 | 379 | |
a08ee875 | 380 | doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP); |
60101509 | 381 | |
a08ee875 LG |
382 | if ((error = dmu_object_info(os, ZVOL_OBJ, doi)) || |
383 | (error = zvol_check_volsize(volsize, doi->doi_data_block_size))) | |
384 | goto out; | |
60101509 | 385 | |
a08ee875 LG |
386 | error = zvol_update_volsize(volsize, os); |
387 | kmem_free(doi, sizeof (dmu_object_info_t)); | |
60101509 | 388 | |
a08ee875 LG |
389 | if (error == 0 && zv != NULL) |
390 | error = zvol_update_live_volsize(zv, volsize); | |
60101509 | 391 | out: |
a08ee875 LG |
392 | if (owned) { |
393 | dmu_objset_disown(os, FTAG); | |
394 | if (zv != NULL) | |
395 | zv->zv_objset = NULL; | |
396 | } | |
60101509 | 397 | mutex_exit(&zvol_state_lock); |
60101509 BB |
398 | return (error); |
399 | } | |
400 | ||
401 | /* | |
402 | * Sanity check volume block size. | |
403 | */ | |
404 | int | |
e10b0808 | 405 | zvol_check_volblocksize(const char *name, uint64_t volblocksize) |
60101509 | 406 | { |
e10b0808 AX |
407 | /* Record sizes above 128k need the feature to be enabled */ |
408 | if (volblocksize > SPA_OLD_MAXBLOCKSIZE) { | |
409 | spa_t *spa; | |
410 | int error; | |
411 | ||
412 | if ((error = spa_open(name, &spa, FTAG)) != 0) | |
413 | return (error); | |
414 | ||
415 | if (!spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { | |
416 | spa_close(spa, FTAG); | |
417 | return (SET_ERROR(ENOTSUP)); | |
418 | } | |
419 | ||
420 | /* | |
421 | * We don't allow setting the property above 1MB, | |
422 | * unless the tunable has been changed. | |
423 | */ | |
424 | if (volblocksize > zfs_max_recordsize) | |
425 | return (SET_ERROR(EDOM)); | |
426 | ||
427 | spa_close(spa, FTAG); | |
428 | } | |
429 | ||
60101509 BB |
430 | if (volblocksize < SPA_MINBLOCKSIZE || |
431 | volblocksize > SPA_MAXBLOCKSIZE || | |
432 | !ISP2(volblocksize)) | |
a08ee875 | 433 | return (SET_ERROR(EDOM)); |
60101509 BB |
434 | |
435 | return (0); | |
436 | } | |
437 | ||
438 | /* | |
439 | * Set ZFS_PROP_VOLBLOCKSIZE set entry point. | |
440 | */ | |
441 | int | |
442 | zvol_set_volblocksize(const char *name, uint64_t volblocksize) | |
443 | { | |
444 | zvol_state_t *zv; | |
445 | dmu_tx_t *tx; | |
446 | int error; | |
447 | ||
448 | mutex_enter(&zvol_state_lock); | |
449 | ||
450 | zv = zvol_find_by_name(name); | |
451 | if (zv == NULL) { | |
a08ee875 | 452 | error = SET_ERROR(ENXIO); |
60101509 BB |
453 | goto out; |
454 | } | |
455 | ||
a08ee875 LG |
456 | if (zv->zv_flags & ZVOL_RDONLY) { |
457 | error = SET_ERROR(EROFS); | |
60101509 BB |
458 | goto out; |
459 | } | |
460 | ||
461 | tx = dmu_tx_create(zv->zv_objset); | |
462 | dmu_tx_hold_bonus(tx, ZVOL_OBJ); | |
463 | error = dmu_tx_assign(tx, TXG_WAIT); | |
464 | if (error) { | |
465 | dmu_tx_abort(tx); | |
466 | } else { | |
467 | error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, | |
468 | volblocksize, 0, tx); | |
469 | if (error == ENOTSUP) | |
a08ee875 | 470 | error = SET_ERROR(EBUSY); |
60101509 BB |
471 | dmu_tx_commit(tx); |
472 | if (error == 0) | |
473 | zv->zv_volblocksize = volblocksize; | |
474 | } | |
475 | out: | |
476 | mutex_exit(&zvol_state_lock); | |
477 | ||
a08ee875 | 478 | return (SET_ERROR(error)); |
60101509 BB |
479 | } |
480 | ||
481 | /* | |
482 | * Replay a TX_WRITE ZIL transaction that didn't get committed | |
483 | * after a system failure | |
484 | */ | |
485 | static int | |
486 | zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) | |
487 | { | |
488 | objset_t *os = zv->zv_objset; | |
489 | char *data = (char *)(lr + 1); /* data follows lr_write_t */ | |
490 | uint64_t off = lr->lr_offset; | |
491 | uint64_t len = lr->lr_length; | |
492 | dmu_tx_t *tx; | |
493 | int error; | |
494 | ||
495 | if (byteswap) | |
496 | byteswap_uint64_array(lr, sizeof (*lr)); | |
497 | ||
498 | tx = dmu_tx_create(os); | |
499 | dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); | |
500 | error = dmu_tx_assign(tx, TXG_WAIT); | |
501 | if (error) { | |
502 | dmu_tx_abort(tx); | |
503 | } else { | |
504 | dmu_write(os, ZVOL_OBJ, off, len, data, tx); | |
505 | dmu_tx_commit(tx); | |
506 | } | |
507 | ||
a08ee875 | 508 | return (SET_ERROR(error)); |
60101509 BB |
509 | } |
510 | ||
511 | static int | |
512 | zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) | |
513 | { | |
a08ee875 | 514 | return (SET_ERROR(ENOTSUP)); |
60101509 BB |
515 | } |
516 | ||
517 | /* | |
518 | * Callback vectors for replaying records. | |
519 | * Only TX_WRITE is needed for zvol. | |
520 | */ | |
b01615d5 RY |
521 | zil_replay_func_t zvol_replay_vector[TX_MAX_TYPE] = { |
522 | (zil_replay_func_t)zvol_replay_err, /* no such transaction type */ | |
523 | (zil_replay_func_t)zvol_replay_err, /* TX_CREATE */ | |
524 | (zil_replay_func_t)zvol_replay_err, /* TX_MKDIR */ | |
525 | (zil_replay_func_t)zvol_replay_err, /* TX_MKXATTR */ | |
526 | (zil_replay_func_t)zvol_replay_err, /* TX_SYMLINK */ | |
527 | (zil_replay_func_t)zvol_replay_err, /* TX_REMOVE */ | |
528 | (zil_replay_func_t)zvol_replay_err, /* TX_RMDIR */ | |
529 | (zil_replay_func_t)zvol_replay_err, /* TX_LINK */ | |
530 | (zil_replay_func_t)zvol_replay_err, /* TX_RENAME */ | |
531 | (zil_replay_func_t)zvol_replay_write, /* TX_WRITE */ | |
532 | (zil_replay_func_t)zvol_replay_err, /* TX_TRUNCATE */ | |
533 | (zil_replay_func_t)zvol_replay_err, /* TX_SETATTR */ | |
534 | (zil_replay_func_t)zvol_replay_err, /* TX_ACL */ | |
60101509 BB |
535 | }; |
536 | ||
537 | /* | |
538 | * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. | |
539 | * | |
540 | * We store data in the log buffers if it's small enough. | |
541 | * Otherwise we will later flush the data out via dmu_sync(). | |
542 | */ | |
543 | ssize_t zvol_immediate_write_sz = 32768; | |
544 | ||
545 | static void | |
a08ee875 LG |
546 | zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset, |
547 | uint64_t size, int sync) | |
60101509 BB |
548 | { |
549 | uint32_t blocksize = zv->zv_volblocksize; | |
550 | zilog_t *zilog = zv->zv_zilog; | |
551 | boolean_t slogging; | |
ab85f845 | 552 | ssize_t immediate_write_sz; |
60101509 BB |
553 | |
554 | if (zil_replaying(zilog, tx)) | |
555 | return; | |
556 | ||
ab85f845 ED |
557 | immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) |
558 | ? 0 : zvol_immediate_write_sz; | |
559 | slogging = spa_has_slogs(zilog->zl_spa) && | |
560 | (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); | |
60101509 BB |
561 | |
562 | while (size) { | |
563 | itx_t *itx; | |
564 | lr_write_t *lr; | |
565 | ssize_t len; | |
566 | itx_wr_state_t write_state; | |
567 | ||
568 | /* | |
569 | * Unlike zfs_log_write() we can be called with | |
570 | * up to DMU_MAX_ACCESS/2 (5MB) writes. | |
571 | */ | |
ab85f845 | 572 | if (blocksize > immediate_write_sz && !slogging && |
60101509 BB |
573 | size >= blocksize && offset % blocksize == 0) { |
574 | write_state = WR_INDIRECT; /* uses dmu_sync */ | |
575 | len = blocksize; | |
576 | } else if (sync) { | |
577 | write_state = WR_COPIED; | |
578 | len = MIN(ZIL_MAX_LOG_DATA, size); | |
579 | } else { | |
580 | write_state = WR_NEED_COPY; | |
581 | len = MIN(ZIL_MAX_LOG_DATA, size); | |
582 | } | |
583 | ||
584 | itx = zil_itx_create(TX_WRITE, sizeof (*lr) + | |
585 | (write_state == WR_COPIED ? len : 0)); | |
586 | lr = (lr_write_t *)&itx->itx_lr; | |
587 | if (write_state == WR_COPIED && dmu_read(zv->zv_objset, | |
588 | ZVOL_OBJ, offset, len, lr+1, DMU_READ_NO_PREFETCH) != 0) { | |
589 | zil_itx_destroy(itx); | |
590 | itx = zil_itx_create(TX_WRITE, sizeof (*lr)); | |
591 | lr = (lr_write_t *)&itx->itx_lr; | |
592 | write_state = WR_NEED_COPY; | |
593 | } | |
594 | ||
595 | itx->itx_wr_state = write_state; | |
596 | if (write_state == WR_NEED_COPY) | |
597 | itx->itx_sod += len; | |
598 | lr->lr_foid = ZVOL_OBJ; | |
599 | lr->lr_offset = offset; | |
600 | lr->lr_length = len; | |
601 | lr->lr_blkoff = 0; | |
602 | BP_ZERO(&lr->lr_blkptr); | |
603 | ||
604 | itx->itx_private = zv; | |
605 | itx->itx_sync = sync; | |
606 | ||
607 | (void) zil_itx_assign(zilog, itx, tx); | |
608 | ||
609 | offset += len; | |
610 | size -= len; | |
611 | } | |
612 | } | |
613 | ||
e10b0808 AX |
614 | static int |
615 | zvol_write(struct bio *bio) | |
60101509 | 616 | { |
e10b0808 AX |
617 | zvol_state_t *zv = bio->bi_bdev->bd_disk->private_data; |
618 | uint64_t offset = BIO_BI_SECTOR(bio) << 9; | |
619 | uint64_t size = BIO_BI_SIZE(bio); | |
60101509 BB |
620 | int error = 0; |
621 | dmu_tx_t *tx; | |
622 | rl_t *rl; | |
623 | ||
4e820b5a AX |
624 | ASSERT(zv && zv->zv_open_count > 0); |
625 | ||
87dac73d | 626 | if (bio_is_flush(bio)) |
b18019d2 ED |
627 | zil_commit(zv->zv_zilog, ZVOL_OBJ); |
628 | ||
629 | /* | |
630 | * Some requests are just for flush and nothing else. | |
631 | */ | |
e10b0808 | 632 | if (size == 0) |
8630650a | 633 | goto out; |
b18019d2 | 634 | |
87dac73d | 635 | rl = zfs_range_lock(&zv->zv_range_lock, offset, size, RL_WRITER); |
60101509 BB |
636 | |
637 | tx = dmu_tx_create(zv->zv_objset); | |
638 | dmu_tx_hold_write(tx, ZVOL_OBJ, offset, size); | |
639 | ||
640 | /* This will only fail for ENOSPC */ | |
641 | error = dmu_tx_assign(tx, TXG_WAIT); | |
642 | if (error) { | |
643 | dmu_tx_abort(tx); | |
644 | zfs_range_unlock(rl); | |
8630650a | 645 | goto out; |
60101509 BB |
646 | } |
647 | ||
e10b0808 | 648 | error = dmu_write_bio(zv->zv_objset, ZVOL_OBJ, bio, tx); |
60101509 | 649 | if (error == 0) |
b18019d2 | 650 | zvol_log_write(zv, tx, offset, size, |
87dac73d | 651 | !!(bio_is_fua(bio))); |
60101509 BB |
652 | |
653 | dmu_tx_commit(tx); | |
654 | zfs_range_unlock(rl); | |
655 | ||
87dac73d | 656 | if ((bio_is_fua(bio)) || |
b18019d2 | 657 | zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) |
60101509 BB |
658 | zil_commit(zv->zv_zilog, ZVOL_OBJ); |
659 | ||
8630650a | 660 | out: |
e10b0808 | 661 | return (error); |
60101509 BB |
662 | } |
663 | ||
e10b0808 AX |
664 | static int |
665 | zvol_discard(struct bio *bio) | |
30930fba | 666 | { |
e10b0808 AX |
667 | zvol_state_t *zv = bio->bi_bdev->bd_disk->private_data; |
668 | uint64_t start = BIO_BI_SECTOR(bio) << 9; | |
669 | uint64_t size = BIO_BI_SIZE(bio); | |
670 | uint64_t end = start + size; | |
30930fba ED |
671 | int error; |
672 | rl_t *rl; | |
673 | ||
4e820b5a AX |
674 | ASSERT(zv && zv->zv_open_count > 0); |
675 | ||
e10b0808 AX |
676 | if (end > zv->zv_volsize) |
677 | return (SET_ERROR(EIO)); | |
30930fba | 678 | |
089fa91b | 679 | /* |
87dac73d AX |
680 | * Align the request to volume block boundaries when a secure erase is |
681 | * not required. This will prevent dnode_free_range() from zeroing out | |
682 | * the unaligned parts which is slow (read-modify-write) and useless | |
683 | * since we are not freeing any space by doing so. | |
089fa91b | 684 | */ |
87dac73d | 685 | if (!bio_is_secure_erase(bio)) { |
e10b0808 AX |
686 | start = P2ROUNDUP(start, zv->zv_volblocksize); |
687 | end = P2ALIGN(end, zv->zv_volblocksize); | |
688 | size = end - start; | |
30930fba ED |
689 | } |
690 | ||
e10b0808 AX |
691 | if (start >= end) |
692 | return (0); | |
693 | ||
87dac73d | 694 | rl = zfs_range_lock(&zv->zv_range_lock, start, size, RL_WRITER); |
30930fba | 695 | |
e10b0808 | 696 | error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, start, size); |
30930fba ED |
697 | |
698 | /* | |
699 | * TODO: maybe we should add the operation to the log. | |
700 | */ | |
30930fba | 701 | zfs_range_unlock(rl); |
e10b0808 AX |
702 | |
703 | return (error); | |
30930fba | 704 | } |
30930fba | 705 | |
e10b0808 AX |
706 | static int |
707 | zvol_read(struct bio *bio) | |
60101509 | 708 | { |
e10b0808 AX |
709 | zvol_state_t *zv = bio->bi_bdev->bd_disk->private_data; |
710 | uint64_t offset = BIO_BI_SECTOR(bio) << 9; | |
711 | uint64_t len = BIO_BI_SIZE(bio); | |
60101509 BB |
712 | int error; |
713 | rl_t *rl; | |
714 | ||
4e820b5a AX |
715 | ASSERT(zv && zv->zv_open_count > 0); |
716 | ||
e10b0808 AX |
717 | if (len == 0) |
718 | return (0); | |
b18019d2 | 719 | |
87dac73d | 720 | rl = zfs_range_lock(&zv->zv_range_lock, offset, len, RL_READER); |
e10b0808 AX |
721 | |
722 | error = dmu_read_bio(zv->zv_objset, ZVOL_OBJ, bio); | |
60101509 BB |
723 | |
724 | zfs_range_unlock(rl); | |
725 | ||
726 | /* convert checksum errors into IO errors */ | |
727 | if (error == ECKSUM) | |
a08ee875 | 728 | error = SET_ERROR(EIO); |
60101509 | 729 | |
e10b0808 | 730 | return (error); |
60101509 BB |
731 | } |
732 | ||
e10b0808 AX |
733 | static MAKE_REQUEST_FN_RET |
734 | zvol_request(struct request_queue *q, struct bio *bio) | |
60101509 BB |
735 | { |
736 | zvol_state_t *zv = q->queuedata; | |
e10b0808 AX |
737 | fstrans_cookie_t cookie = spl_fstrans_mark(); |
738 | uint64_t offset = BIO_BI_SECTOR(bio); | |
739 | unsigned int sectors = bio_sectors(bio); | |
740 | int rw = bio_data_dir(bio); | |
741 | #ifdef HAVE_GENERIC_IO_ACCT | |
742 | unsigned long start = jiffies; | |
743 | #endif | |
744 | int error = 0; | |
60101509 | 745 | |
e10b0808 AX |
746 | if (bio_has_data(bio) && offset + sectors > |
747 | get_capacity(zv->zv_disk)) { | |
748 | printk(KERN_INFO | |
749 | "%s: bad access: block=%llu, count=%lu\n", | |
750 | zv->zv_disk->disk_name, | |
751 | (long long unsigned)offset, | |
752 | (long unsigned)sectors); | |
753 | error = SET_ERROR(EIO); | |
754 | goto out1; | |
755 | } | |
60101509 | 756 | |
e10b0808 | 757 | generic_start_io_acct(rw, sectors, &zv->zv_disk->part0); |
60101509 | 758 | |
e10b0808 AX |
759 | if (rw == WRITE) { |
760 | if (unlikely(zv->zv_flags & ZVOL_RDONLY)) { | |
761 | error = SET_ERROR(EROFS); | |
762 | goto out2; | |
763 | } | |
30930fba | 764 | |
87dac73d | 765 | if (bio_is_discard(bio) || bio_is_secure_erase(bio)) { |
e10b0808 AX |
766 | error = zvol_discard(bio); |
767 | goto out2; | |
60101509 | 768 | } |
e10b0808 AX |
769 | |
770 | error = zvol_write(bio); | |
771 | } else | |
772 | error = zvol_read(bio); | |
773 | ||
774 | out2: | |
775 | generic_end_io_acct(rw, &zv->zv_disk->part0, start); | |
776 | out1: | |
777 | BIO_END_IO(bio, -error); | |
778 | spl_fstrans_unmark(cookie); | |
779 | #ifdef HAVE_MAKE_REQUEST_FN_RET_INT | |
780 | return (0); | |
94a40997 AX |
781 | #elif defined(HAVE_MAKE_REQUEST_FN_RET_QC) |
782 | return (BLK_QC_T_NONE); | |
e10b0808 | 783 | #endif |
60101509 BB |
784 | } |
785 | ||
786 | static void | |
787 | zvol_get_done(zgd_t *zgd, int error) | |
788 | { | |
789 | if (zgd->zgd_db) | |
790 | dmu_buf_rele(zgd->zgd_db, zgd); | |
791 | ||
792 | zfs_range_unlock(zgd->zgd_rl); | |
793 | ||
794 | if (error == 0 && zgd->zgd_bp) | |
795 | zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); | |
796 | ||
797 | kmem_free(zgd, sizeof (zgd_t)); | |
798 | } | |
799 | ||
800 | /* | |
801 | * Get data to generate a TX_WRITE intent log record. | |
802 | */ | |
803 | static int | |
804 | zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) | |
805 | { | |
806 | zvol_state_t *zv = arg; | |
807 | objset_t *os = zv->zv_objset; | |
a08ee875 | 808 | uint64_t object = ZVOL_OBJ; |
60101509 BB |
809 | uint64_t offset = lr->lr_offset; |
810 | uint64_t size = lr->lr_length; | |
a08ee875 | 811 | blkptr_t *bp = &lr->lr_blkptr; |
60101509 BB |
812 | dmu_buf_t *db; |
813 | zgd_t *zgd; | |
814 | int error; | |
815 | ||
816 | ASSERT(zio != NULL); | |
817 | ASSERT(size != 0); | |
818 | ||
ea04106b | 819 | zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP); |
60101509 | 820 | zgd->zgd_zilog = zv->zv_zilog; |
87dac73d AX |
821 | zgd->zgd_rl = zfs_range_lock(&zv->zv_range_lock, offset, size, |
822 | RL_READER); | |
60101509 BB |
823 | |
824 | /* | |
825 | * Write records come in two flavors: immediate and indirect. | |
826 | * For small writes it's cheaper to store the data with the | |
827 | * log record (immediate); for large writes it's cheaper to | |
828 | * sync the data and get a pointer to it (indirect) so that | |
829 | * we don't have to write the data twice. | |
830 | */ | |
831 | if (buf != NULL) { /* immediate write */ | |
a08ee875 | 832 | error = dmu_read(os, object, offset, size, buf, |
60101509 BB |
833 | DMU_READ_NO_PREFETCH); |
834 | } else { | |
835 | size = zv->zv_volblocksize; | |
836 | offset = P2ALIGN_TYPED(offset, size, uint64_t); | |
a08ee875 | 837 | error = dmu_buf_hold(os, object, offset, zgd, &db, |
60101509 BB |
838 | DMU_READ_NO_PREFETCH); |
839 | if (error == 0) { | |
a08ee875 LG |
840 | blkptr_t *obp = dmu_buf_get_blkptr(db); |
841 | if (obp) { | |
842 | ASSERT(BP_IS_HOLE(bp)); | |
843 | *bp = *obp; | |
844 | } | |
845 | ||
60101509 BB |
846 | zgd->zgd_db = db; |
847 | zgd->zgd_bp = &lr->lr_blkptr; | |
848 | ||
849 | ASSERT(db != NULL); | |
850 | ASSERT(db->db_offset == offset); | |
851 | ASSERT(db->db_size == size); | |
852 | ||
853 | error = dmu_sync(zio, lr->lr_common.lrc_txg, | |
854 | zvol_get_done, zgd); | |
855 | ||
856 | if (error == 0) | |
857 | return (0); | |
858 | } | |
859 | } | |
860 | ||
861 | zvol_get_done(zgd, error); | |
862 | ||
a08ee875 | 863 | return (SET_ERROR(error)); |
60101509 BB |
864 | } |
865 | ||
866 | /* | |
867 | * The zvol_state_t's are inserted in increasing MINOR(dev_t) order. | |
868 | */ | |
869 | static void | |
870 | zvol_insert(zvol_state_t *zv_insert) | |
871 | { | |
872 | zvol_state_t *zv = NULL; | |
873 | ||
874 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
875 | ASSERT3U(MINOR(zv_insert->zv_dev) & ZVOL_MINOR_MASK, ==, 0); | |
876 | for (zv = list_head(&zvol_state_list); zv != NULL; | |
a08ee875 | 877 | zv = list_next(&zvol_state_list, zv)) { |
60101509 BB |
878 | if (MINOR(zv->zv_dev) > MINOR(zv_insert->zv_dev)) |
879 | break; | |
880 | } | |
881 | ||
882 | list_insert_before(&zvol_state_list, zv, zv_insert); | |
883 | } | |
884 | ||
885 | /* | |
886 | * Simply remove the zvol from to list of zvols. | |
887 | */ | |
888 | static void | |
889 | zvol_remove(zvol_state_t *zv_remove) | |
890 | { | |
891 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
892 | list_remove(&zvol_state_list, zv_remove); | |
893 | } | |
894 | ||
895 | static int | |
896 | zvol_first_open(zvol_state_t *zv) | |
897 | { | |
898 | objset_t *os; | |
899 | uint64_t volsize; | |
900 | int error; | |
901 | uint64_t ro; | |
902 | ||
903 | /* lie and say we're read-only */ | |
904 | error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, 1, zvol_tag, &os); | |
905 | if (error) | |
4e820b5a AX |
906 | return (SET_ERROR(-error)); |
907 | ||
908 | zv->zv_objset = os; | |
909 | ||
910 | error = dsl_prop_get_integer(zv->zv_name, "readonly", &ro, NULL); | |
911 | if (error) | |
912 | goto out_owned; | |
60101509 BB |
913 | |
914 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); | |
4e820b5a AX |
915 | if (error) |
916 | goto out_owned; | |
60101509 | 917 | |
60101509 | 918 | error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf); |
4e820b5a AX |
919 | if (error) |
920 | goto out_owned; | |
60101509 BB |
921 | |
922 | set_capacity(zv->zv_disk, volsize >> 9); | |
923 | zv->zv_volsize = volsize; | |
924 | zv->zv_zilog = zil_open(os, zvol_get_data); | |
925 | ||
a4430fce GW |
926 | if (ro || dmu_objset_is_snapshot(os) || |
927 | !spa_writeable(dmu_objset_spa(os))) { | |
babf3f9b MM |
928 | set_disk_ro(zv->zv_disk, 1); |
929 | zv->zv_flags |= ZVOL_RDONLY; | |
60101509 | 930 | } else { |
babf3f9b MM |
931 | set_disk_ro(zv->zv_disk, 0); |
932 | zv->zv_flags &= ~ZVOL_RDONLY; | |
60101509 BB |
933 | } |
934 | ||
4e820b5a AX |
935 | out_owned: |
936 | if (error) { | |
937 | dmu_objset_disown(os, zvol_tag); | |
938 | zv->zv_objset = NULL; | |
939 | } | |
babf3f9b | 940 | |
a08ee875 | 941 | return (SET_ERROR(-error)); |
60101509 BB |
942 | } |
943 | ||
944 | static void | |
945 | zvol_last_close(zvol_state_t *zv) | |
946 | { | |
947 | zil_close(zv->zv_zilog); | |
948 | zv->zv_zilog = NULL; | |
04434775 | 949 | |
60101509 BB |
950 | dmu_buf_rele(zv->zv_dbuf, zvol_tag); |
951 | zv->zv_dbuf = NULL; | |
04434775 MA |
952 | |
953 | /* | |
954 | * Evict cached data | |
955 | */ | |
956 | if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) && | |
957 | !(zv->zv_flags & ZVOL_RDONLY)) | |
958 | txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); | |
959 | (void) dmu_objset_evict_dbufs(zv->zv_objset); | |
960 | ||
60101509 BB |
961 | dmu_objset_disown(zv->zv_objset, zvol_tag); |
962 | zv->zv_objset = NULL; | |
963 | } | |
964 | ||
965 | static int | |
966 | zvol_open(struct block_device *bdev, fmode_t flag) | |
967 | { | |
4e820b5a | 968 | zvol_state_t *zv; |
60101509 BB |
969 | int error = 0, drop_mutex = 0; |
970 | ||
971 | /* | |
972 | * If the caller is already holding the mutex do not take it | |
4e820b5a | 973 | * again, this will happen as part of zvol_create_minor_impl(). |
60101509 BB |
974 | * Once add_disk() is called the device is live and the kernel |
975 | * will attempt to open it to read the partition information. | |
976 | */ | |
977 | if (!mutex_owned(&zvol_state_lock)) { | |
978 | mutex_enter(&zvol_state_lock); | |
979 | drop_mutex = 1; | |
980 | } | |
981 | ||
4e820b5a AX |
982 | /* |
983 | * Obtain a copy of private_data under the lock to make sure | |
984 | * that either the result of zvol_freeg() setting | |
985 | * bdev->bd_disk->private_data to NULL is observed, or zvol_free() | |
986 | * is not called on this zv because of the positive zv_open_count. | |
987 | */ | |
988 | zv = bdev->bd_disk->private_data; | |
989 | if (zv == NULL) { | |
990 | error = -ENXIO; | |
991 | goto out_mutex; | |
992 | } | |
60101509 BB |
993 | |
994 | if (zv->zv_open_count == 0) { | |
995 | error = zvol_first_open(zv); | |
996 | if (error) | |
997 | goto out_mutex; | |
998 | } | |
999 | ||
a08ee875 | 1000 | if ((flag & FMODE_WRITE) && (zv->zv_flags & ZVOL_RDONLY)) { |
60101509 BB |
1001 | error = -EROFS; |
1002 | goto out_open_count; | |
1003 | } | |
1004 | ||
1005 | zv->zv_open_count++; | |
1006 | ||
4e820b5a AX |
1007 | check_disk_change(bdev); |
1008 | ||
60101509 BB |
1009 | out_open_count: |
1010 | if (zv->zv_open_count == 0) | |
1011 | zvol_last_close(zv); | |
1012 | ||
1013 | out_mutex: | |
1014 | if (drop_mutex) | |
1015 | mutex_exit(&zvol_state_lock); | |
1016 | ||
a08ee875 | 1017 | return (SET_ERROR(error)); |
60101509 BB |
1018 | } |
1019 | ||
c06d4368 AX |
1020 | #ifdef HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID |
1021 | static void | |
1022 | #else | |
60101509 | 1023 | static int |
c06d4368 | 1024 | #endif |
60101509 BB |
1025 | zvol_release(struct gendisk *disk, fmode_t mode) |
1026 | { | |
1027 | zvol_state_t *zv = disk->private_data; | |
1028 | int drop_mutex = 0; | |
1029 | ||
4e820b5a AX |
1030 | ASSERT(zv && zv->zv_open_count > 0); |
1031 | ||
60101509 BB |
1032 | if (!mutex_owned(&zvol_state_lock)) { |
1033 | mutex_enter(&zvol_state_lock); | |
1034 | drop_mutex = 1; | |
1035 | } | |
1036 | ||
4e820b5a AX |
1037 | zv->zv_open_count--; |
1038 | if (zv->zv_open_count == 0) | |
1039 | zvol_last_close(zv); | |
60101509 BB |
1040 | |
1041 | if (drop_mutex) | |
1042 | mutex_exit(&zvol_state_lock); | |
1043 | ||
c06d4368 | 1044 | #ifndef HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID |
60101509 | 1045 | return (0); |
c06d4368 | 1046 | #endif |
60101509 BB |
1047 | } |
1048 | ||
1049 | static int | |
1050 | zvol_ioctl(struct block_device *bdev, fmode_t mode, | |
a08ee875 | 1051 | unsigned int cmd, unsigned long arg) |
60101509 BB |
1052 | { |
1053 | zvol_state_t *zv = bdev->bd_disk->private_data; | |
1054 | int error = 0; | |
1055 | ||
4e820b5a | 1056 | ASSERT(zv && zv->zv_open_count > 0); |
60101509 BB |
1057 | |
1058 | switch (cmd) { | |
1059 | case BLKFLSBUF: | |
1060 | zil_commit(zv->zv_zilog, ZVOL_OBJ); | |
1061 | break; | |
4c0d8e50 FN |
1062 | case BLKZNAME: |
1063 | error = copy_to_user((void *)arg, zv->zv_name, MAXNAMELEN); | |
1064 | break; | |
60101509 BB |
1065 | |
1066 | default: | |
1067 | error = -ENOTTY; | |
1068 | break; | |
1069 | ||
1070 | } | |
1071 | ||
a08ee875 | 1072 | return (SET_ERROR(error)); |
60101509 BB |
1073 | } |
1074 | ||
1075 | #ifdef CONFIG_COMPAT | |
1076 | static int | |
1077 | zvol_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
a08ee875 | 1078 | unsigned cmd, unsigned long arg) |
60101509 | 1079 | { |
a08ee875 | 1080 | return (zvol_ioctl(bdev, mode, cmd, arg)); |
60101509 BB |
1081 | } |
1082 | #else | |
a08ee875 | 1083 | #define zvol_compat_ioctl NULL |
60101509 BB |
1084 | #endif |
1085 | ||
1086 | static int zvol_media_changed(struct gendisk *disk) | |
1087 | { | |
1088 | zvol_state_t *zv = disk->private_data; | |
1089 | ||
4e820b5a AX |
1090 | ASSERT(zv && zv->zv_open_count > 0); |
1091 | ||
a08ee875 | 1092 | return (zv->zv_changed); |
60101509 BB |
1093 | } |
1094 | ||
1095 | static int zvol_revalidate_disk(struct gendisk *disk) | |
1096 | { | |
1097 | zvol_state_t *zv = disk->private_data; | |
1098 | ||
4e820b5a AX |
1099 | ASSERT(zv && zv->zv_open_count > 0); |
1100 | ||
60101509 BB |
1101 | zv->zv_changed = 0; |
1102 | set_capacity(zv->zv_disk, zv->zv_volsize >> 9); | |
1103 | ||
a08ee875 | 1104 | return (0); |
60101509 BB |
1105 | } |
1106 | ||
1107 | /* | |
1108 | * Provide a simple virtual geometry for legacy compatibility. For devices | |
1109 | * smaller than 1 MiB a small head and sector count is used to allow very | |
1110 | * tiny devices. For devices over 1 Mib a standard head and sector count | |
1111 | * is used to keep the cylinders count reasonable. | |
1112 | */ | |
1113 | static int | |
1114 | zvol_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
1115 | { | |
1116 | zvol_state_t *zv = bdev->bd_disk->private_data; | |
4e820b5a AX |
1117 | sector_t sectors; |
1118 | ||
1119 | ASSERT(zv && zv->zv_open_count > 0); | |
1120 | ||
1121 | sectors = get_capacity(zv->zv_disk); | |
60101509 BB |
1122 | |
1123 | if (sectors > 2048) { | |
1124 | geo->heads = 16; | |
1125 | geo->sectors = 63; | |
1126 | } else { | |
1127 | geo->heads = 2; | |
1128 | geo->sectors = 4; | |
1129 | } | |
1130 | ||
1131 | geo->start = 0; | |
1132 | geo->cylinders = sectors / (geo->heads * geo->sectors); | |
1133 | ||
a08ee875 | 1134 | return (0); |
60101509 BB |
1135 | } |
1136 | ||
1137 | static struct kobject * | |
1138 | zvol_probe(dev_t dev, int *part, void *arg) | |
1139 | { | |
1140 | zvol_state_t *zv; | |
1141 | struct kobject *kobj; | |
1142 | ||
1143 | mutex_enter(&zvol_state_lock); | |
1144 | zv = zvol_find_by_dev(dev); | |
23a61ccc | 1145 | kobj = zv ? get_disk(zv->zv_disk) : NULL; |
60101509 BB |
1146 | mutex_exit(&zvol_state_lock); |
1147 | ||
a08ee875 | 1148 | return (kobj); |
60101509 BB |
1149 | } |
1150 | ||
1151 | #ifdef HAVE_BDEV_BLOCK_DEVICE_OPERATIONS | |
1152 | static struct block_device_operations zvol_ops = { | |
a08ee875 LG |
1153 | .open = zvol_open, |
1154 | .release = zvol_release, | |
1155 | .ioctl = zvol_ioctl, | |
1156 | .compat_ioctl = zvol_compat_ioctl, | |
1157 | .media_changed = zvol_media_changed, | |
1158 | .revalidate_disk = zvol_revalidate_disk, | |
1159 | .getgeo = zvol_getgeo, | |
1160 | .owner = THIS_MODULE, | |
60101509 BB |
1161 | }; |
1162 | ||
1163 | #else /* HAVE_BDEV_BLOCK_DEVICE_OPERATIONS */ | |
1164 | ||
1165 | static int | |
1166 | zvol_open_by_inode(struct inode *inode, struct file *file) | |
1167 | { | |
a08ee875 | 1168 | return (zvol_open(inode->i_bdev, file->f_mode)); |
60101509 BB |
1169 | } |
1170 | ||
1171 | static int | |
1172 | zvol_release_by_inode(struct inode *inode, struct file *file) | |
1173 | { | |
a08ee875 | 1174 | return (zvol_release(inode->i_bdev->bd_disk, file->f_mode)); |
60101509 BB |
1175 | } |
1176 | ||
1177 | static int | |
1178 | zvol_ioctl_by_inode(struct inode *inode, struct file *file, | |
a08ee875 | 1179 | unsigned int cmd, unsigned long arg) |
60101509 | 1180 | { |
b1c58213 | 1181 | if (file == NULL || inode == NULL) |
a08ee875 LG |
1182 | return (SET_ERROR(-EINVAL)); |
1183 | ||
1184 | return (zvol_ioctl(inode->i_bdev, file->f_mode, cmd, arg)); | |
60101509 BB |
1185 | } |
1186 | ||
a08ee875 | 1187 | #ifdef CONFIG_COMPAT |
60101509 BB |
1188 | static long |
1189 | zvol_compat_ioctl_by_inode(struct file *file, | |
a08ee875 | 1190 | unsigned int cmd, unsigned long arg) |
60101509 | 1191 | { |
b1c58213 | 1192 | if (file == NULL) |
a08ee875 LG |
1193 | return (SET_ERROR(-EINVAL)); |
1194 | ||
1195 | return (zvol_compat_ioctl(file->f_dentry->d_inode->i_bdev, | |
1196 | file->f_mode, cmd, arg)); | |
60101509 | 1197 | } |
a08ee875 LG |
1198 | #else |
1199 | #define zvol_compat_ioctl_by_inode NULL | |
1200 | #endif | |
60101509 BB |
1201 | |
1202 | static struct block_device_operations zvol_ops = { | |
a08ee875 LG |
1203 | .open = zvol_open_by_inode, |
1204 | .release = zvol_release_by_inode, | |
1205 | .ioctl = zvol_ioctl_by_inode, | |
1206 | .compat_ioctl = zvol_compat_ioctl_by_inode, | |
1207 | .media_changed = zvol_media_changed, | |
1208 | .revalidate_disk = zvol_revalidate_disk, | |
1209 | .getgeo = zvol_getgeo, | |
1210 | .owner = THIS_MODULE, | |
60101509 BB |
1211 | }; |
1212 | #endif /* HAVE_BDEV_BLOCK_DEVICE_OPERATIONS */ | |
1213 | ||
1214 | /* | |
1215 | * Allocate memory for a new zvol_state_t and setup the required | |
1216 | * request queue and generic disk structures for the block device. | |
1217 | */ | |
1218 | static zvol_state_t * | |
1219 | zvol_alloc(dev_t dev, const char *name) | |
1220 | { | |
1221 | zvol_state_t *zv; | |
1222 | ||
ea04106b | 1223 | zv = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); |
c06d4368 AX |
1224 | |
1225 | spin_lock_init(&zv->zv_lock); | |
1226 | list_link_init(&zv->zv_next); | |
60101509 | 1227 | |
e10b0808 | 1228 | zv->zv_queue = blk_alloc_queue(GFP_ATOMIC); |
60101509 BB |
1229 | if (zv->zv_queue == NULL) |
1230 | goto out_kmem; | |
1231 | ||
e10b0808 | 1232 | blk_queue_make_request(zv->zv_queue, zvol_request); |
87dac73d | 1233 | blk_queue_set_write_cache(zv->zv_queue, B_TRUE, B_TRUE); |
b18019d2 | 1234 | |
60101509 BB |
1235 | zv->zv_disk = alloc_disk(ZVOL_MINORS); |
1236 | if (zv->zv_disk == NULL) | |
1237 | goto out_queue; | |
1238 | ||
1239 | zv->zv_queue->queuedata = zv; | |
1240 | zv->zv_dev = dev; | |
1241 | zv->zv_open_count = 0; | |
4c0d8e50 | 1242 | strlcpy(zv->zv_name, name, MAXNAMELEN); |
60101509 | 1243 | |
87dac73d | 1244 | zfs_rlock_init(&zv->zv_range_lock); |
3c4988c8 | 1245 | |
60101509 BB |
1246 | zv->zv_disk->major = zvol_major; |
1247 | zv->zv_disk->first_minor = (dev & MINORMASK); | |
1248 | zv->zv_disk->fops = &zvol_ops; | |
1249 | zv->zv_disk->private_data = zv; | |
1250 | zv->zv_disk->queue = zv->zv_queue; | |
4c0d8e50 FN |
1251 | snprintf(zv->zv_disk->disk_name, DISK_NAME_LEN, "%s%d", |
1252 | ZVOL_DEV_NAME, (dev & MINORMASK)); | |
60101509 | 1253 | |
a08ee875 | 1254 | return (zv); |
60101509 BB |
1255 | |
1256 | out_queue: | |
1257 | blk_cleanup_queue(zv->zv_queue); | |
1258 | out_kmem: | |
1259 | kmem_free(zv, sizeof (zvol_state_t)); | |
c06d4368 | 1260 | |
a08ee875 | 1261 | return (NULL); |
60101509 BB |
1262 | } |
1263 | ||
1264 | /* | |
1265 | * Cleanup then free a zvol_state_t which was created by zvol_alloc(). | |
1266 | */ | |
1267 | static void | |
1268 | zvol_free(zvol_state_t *zv) | |
1269 | { | |
4e820b5a AX |
1270 | ASSERT(MUTEX_HELD(&zvol_state_lock)); |
1271 | ASSERT(zv->zv_open_count == 0); | |
1272 | ||
87dac73d | 1273 | zfs_rlock_destroy(&zv->zv_range_lock); |
60101509 | 1274 | |
4e820b5a AX |
1275 | zv->zv_disk->private_data = NULL; |
1276 | ||
60101509 BB |
1277 | del_gendisk(zv->zv_disk); |
1278 | blk_cleanup_queue(zv->zv_queue); | |
1279 | put_disk(zv->zv_disk); | |
1280 | ||
1281 | kmem_free(zv, sizeof (zvol_state_t)); | |
1282 | } | |
1283 | ||
4e820b5a AX |
1284 | /* |
1285 | * Create a block device minor node and setup the linkage between it | |
1286 | * and the specified volume. Once this function returns the block | |
1287 | * device is live and ready for use. | |
1288 | */ | |
60101509 | 1289 | static int |
4e820b5a | 1290 | zvol_create_minor_impl(const char *name) |
60101509 BB |
1291 | { |
1292 | zvol_state_t *zv; | |
1293 | objset_t *os; | |
1294 | dmu_object_info_t *doi; | |
1295 | uint64_t volsize; | |
e10b0808 | 1296 | uint64_t len; |
60101509 BB |
1297 | unsigned minor = 0; |
1298 | int error = 0; | |
1299 | ||
4e820b5a | 1300 | mutex_enter(&zvol_state_lock); |
60101509 BB |
1301 | |
1302 | zv = zvol_find_by_name(name); | |
1303 | if (zv) { | |
a08ee875 | 1304 | error = SET_ERROR(EEXIST); |
60101509 BB |
1305 | goto out; |
1306 | } | |
1307 | ||
ea04106b | 1308 | doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP); |
60101509 BB |
1309 | |
1310 | error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, zvol_tag, &os); | |
1311 | if (error) | |
1312 | goto out_doi; | |
1313 | ||
1314 | error = dmu_object_info(os, ZVOL_OBJ, doi); | |
1315 | if (error) | |
1316 | goto out_dmu_objset_disown; | |
1317 | ||
1318 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); | |
1319 | if (error) | |
1320 | goto out_dmu_objset_disown; | |
1321 | ||
1322 | error = zvol_find_minor(&minor); | |
1323 | if (error) | |
1324 | goto out_dmu_objset_disown; | |
1325 | ||
1326 | zv = zvol_alloc(MKDEV(zvol_major, minor), name); | |
1327 | if (zv == NULL) { | |
a08ee875 | 1328 | error = SET_ERROR(EAGAIN); |
60101509 BB |
1329 | goto out_dmu_objset_disown; |
1330 | } | |
1331 | ||
1332 | if (dmu_objset_is_snapshot(os)) | |
1333 | zv->zv_flags |= ZVOL_RDONLY; | |
1334 | ||
1335 | zv->zv_volblocksize = doi->doi_data_block_size; | |
1336 | zv->zv_volsize = volsize; | |
1337 | zv->zv_objset = os; | |
1338 | ||
1339 | set_capacity(zv->zv_disk, zv->zv_volsize >> 9); | |
1340 | ||
e10b0808 | 1341 | blk_queue_max_hw_sectors(zv->zv_queue, (DMU_MAX_ACCESS / 4) >> 9); |
34037afe ED |
1342 | blk_queue_max_segments(zv->zv_queue, UINT16_MAX); |
1343 | blk_queue_max_segment_size(zv->zv_queue, UINT_MAX); | |
1344 | blk_queue_physical_block_size(zv->zv_queue, zv->zv_volblocksize); | |
1345 | blk_queue_io_opt(zv->zv_queue, zv->zv_volblocksize); | |
7c0e5708 ED |
1346 | blk_queue_max_discard_sectors(zv->zv_queue, |
1347 | (zvol_max_discard_blocks * zv->zv_volblocksize) >> 9); | |
ee5fd0bb | 1348 | blk_queue_discard_granularity(zv->zv_queue, zv->zv_volblocksize); |
30930fba | 1349 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, zv->zv_queue); |
e10b0808 | 1350 | #ifdef QUEUE_FLAG_NONROT |
34037afe ED |
1351 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zv->zv_queue); |
1352 | #endif | |
e10b0808 AX |
1353 | #ifdef QUEUE_FLAG_ADD_RANDOM |
1354 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, zv->zv_queue); | |
1355 | #endif | |
34037afe | 1356 | |
a4430fce GW |
1357 | if (spa_writeable(dmu_objset_spa(os))) { |
1358 | if (zil_replay_disable) | |
1359 | zil_destroy(dmu_objset_zil(os), B_FALSE); | |
1360 | else | |
1361 | zil_replay(os, zv, zvol_replay_vector); | |
1362 | } | |
60101509 | 1363 | |
e10b0808 AX |
1364 | /* |
1365 | * When udev detects the addition of the device it will immediately | |
1366 | * invoke blkid(8) to determine the type of content on the device. | |
1367 | * Prefetching the blocks commonly scanned by blkid(8) will speed | |
1368 | * up this process. | |
1369 | */ | |
1370 | len = MIN(MAX(zvol_prefetch_bytes, 0), SPA_MAXBLOCKSIZE); | |
1371 | if (len > 0) { | |
1372 | dmu_prefetch(os, ZVOL_OBJ, 0, len); | |
1373 | dmu_prefetch(os, ZVOL_OBJ, volsize - len, len); | |
1374 | } | |
1375 | ||
f74a147c | 1376 | zv->zv_objset = NULL; |
60101509 BB |
1377 | out_dmu_objset_disown: |
1378 | dmu_objset_disown(os, zvol_tag); | |
60101509 | 1379 | out_doi: |
a08ee875 | 1380 | kmem_free(doi, sizeof (dmu_object_info_t)); |
60101509 BB |
1381 | out: |
1382 | ||
1383 | if (error == 0) { | |
1384 | zvol_insert(zv); | |
4e820b5a AX |
1385 | /* |
1386 | * Drop the lock to prevent deadlock with sys_open() -> | |
1387 | * zvol_open(), which first takes bd_disk->bd_mutex and then | |
1388 | * takes zvol_state_lock, whereas this code path first takes | |
1389 | * zvol_state_lock, and then takes bd_disk->bd_mutex. | |
1390 | */ | |
1391 | mutex_exit(&zvol_state_lock); | |
60101509 | 1392 | add_disk(zv->zv_disk); |
4e820b5a AX |
1393 | } else { |
1394 | mutex_exit(&zvol_state_lock); | |
60101509 BB |
1395 | } |
1396 | ||
a08ee875 | 1397 | return (SET_ERROR(error)); |
60101509 BB |
1398 | } |
1399 | ||
a08ee875 LG |
1400 | /* |
1401 | * Rename a block device minor mode for the specified volume. | |
1402 | */ | |
1403 | static void | |
4e820b5a | 1404 | zvol_rename_minor(zvol_state_t *zv, const char *newname) |
a08ee875 LG |
1405 | { |
1406 | int readonly = get_disk_ro(zv->zv_disk); | |
1407 | ||
1408 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
1409 | ||
1410 | strlcpy(zv->zv_name, newname, sizeof (zv->zv_name)); | |
1411 | ||
1412 | /* | |
1413 | * The block device's read-only state is briefly changed causing | |
1414 | * a KOBJ_CHANGE uevent to be issued. This ensures udev detects | |
1415 | * the name change and fixes the symlinks. This does not change | |
1416 | * ZVOL_RDONLY in zv->zv_flags so the actual read-only state never | |
1417 | * changes. This would normally be done using kobject_uevent() but | |
1418 | * that is a GPL-only symbol which is why we need this workaround. | |
1419 | */ | |
1420 | set_disk_ro(zv->zv_disk, !readonly); | |
1421 | set_disk_ro(zv->zv_disk, readonly); | |
60101509 BB |
1422 | } |
1423 | ||
4e820b5a AX |
1424 | |
1425 | /* | |
1426 | * Mask errors to continue dmu_objset_find() traversal | |
1427 | */ | |
1428 | static int | |
1429 | zvol_create_snap_minor_cb(const char *dsname, void *arg) | |
1430 | { | |
1431 | const char *name = (const char *)arg; | |
1432 | ||
1433 | ASSERT0(MUTEX_HELD(&spa_namespace_lock)); | |
1434 | ||
1435 | /* skip the designated dataset */ | |
1436 | if (name && strcmp(dsname, name) == 0) | |
1437 | return (0); | |
1438 | ||
1439 | /* at this point, the dsname should name a snapshot */ | |
1440 | if (strchr(dsname, '@') == 0) { | |
1441 | dprintf("zvol_create_snap_minor_cb(): " | |
1442 | "%s is not a shapshot name\n", dsname); | |
1443 | } else { | |
1444 | (void) zvol_create_minor_impl(dsname); | |
1445 | } | |
1446 | ||
1447 | return (0); | |
1448 | } | |
1449 | ||
1450 | /* | |
1451 | * Mask errors to continue dmu_objset_find() traversal | |
1452 | */ | |
60101509 | 1453 | static int |
a08ee875 | 1454 | zvol_create_minors_cb(const char *dsname, void *arg) |
60101509 | 1455 | { |
4e820b5a AX |
1456 | uint64_t snapdev; |
1457 | int error; | |
1458 | ||
1459 | ASSERT0(MUTEX_HELD(&spa_namespace_lock)); | |
1460 | ||
1461 | error = dsl_prop_get_integer(dsname, "snapdev", &snapdev, NULL); | |
1462 | if (error) | |
1463 | return (0); | |
1464 | ||
1465 | /* | |
1466 | * Given the name and the 'snapdev' property, create device minor nodes | |
1467 | * with the linkages to zvols/snapshots as needed. | |
1468 | * If the name represents a zvol, create a minor node for the zvol, then | |
1469 | * check if its snapshots are 'visible', and if so, iterate over the | |
1470 | * snapshots and create device minor nodes for those. | |
1471 | */ | |
1472 | if (strchr(dsname, '@') == 0) { | |
1473 | /* create minor for the 'dsname' explicitly */ | |
1474 | error = zvol_create_minor_impl(dsname); | |
1475 | if ((error == 0 || error == EEXIST) && | |
1476 | (snapdev == ZFS_SNAPDEV_VISIBLE)) { | |
1477 | fstrans_cookie_t cookie = spl_fstrans_mark(); | |
1478 | /* | |
1479 | * traverse snapshots only, do not traverse children, | |
1480 | * and skip the 'dsname' | |
1481 | */ | |
1482 | error = dmu_objset_find((char *)dsname, | |
1483 | zvol_create_snap_minor_cb, (void *)dsname, | |
1484 | DS_FIND_SNAPSHOTS); | |
1485 | spl_fstrans_unmark(cookie); | |
1486 | } | |
1487 | } else { | |
1488 | dprintf("zvol_create_minors_cb(): %s is not a zvol name\n", | |
1489 | dsname); | |
1490 | } | |
60101509 | 1491 | |
d5674448 | 1492 | return (0); |
60101509 BB |
1493 | } |
1494 | ||
1495 | /* | |
4e820b5a AX |
1496 | * Create minors for the specified dataset, including children and snapshots. |
1497 | * Pay attention to the 'snapdev' property and iterate over the snapshots | |
1498 | * only if they are 'visible'. This approach allows one to assure that the | |
1499 | * snapshot metadata is read from disk only if it is needed. | |
1500 | * | |
1501 | * The name can represent a dataset to be recursively scanned for zvols and | |
1502 | * their snapshots, or a single zvol snapshot. If the name represents a | |
1503 | * dataset, the scan is performed in two nested stages: | |
1504 | * - scan the dataset for zvols, and | |
1505 | * - for each zvol, create a minor node, then check if the zvol's snapshots | |
1506 | * are 'visible', and only then iterate over the snapshots if needed | |
1507 | * | |
1508 | * If the name represents a snapshot, a check is perfromed if the snapshot is | |
1509 | * 'visible' (which also verifies that the parent is a zvol), and if so, | |
1510 | * a minor node for that snapshot is created. | |
60101509 | 1511 | */ |
4e820b5a AX |
1512 | static int |
1513 | zvol_create_minors_impl(const char *name) | |
60101509 | 1514 | { |
60101509 | 1515 | int error = 0; |
4e820b5a AX |
1516 | fstrans_cookie_t cookie; |
1517 | char *atp, *parent; | |
1518 | ||
1519 | if (zvol_inhibit_dev) | |
1520 | return (0); | |
1521 | ||
1522 | parent = kmem_alloc(MAXPATHLEN, KM_SLEEP); | |
1523 | (void) strlcpy(parent, name, MAXPATHLEN); | |
1524 | ||
1525 | if ((atp = strrchr(parent, '@')) != NULL) { | |
1526 | uint64_t snapdev; | |
1527 | ||
1528 | *atp = '\0'; | |
1529 | error = dsl_prop_get_integer(parent, "snapdev", | |
1530 | &snapdev, NULL); | |
1531 | ||
1532 | if (error == 0 && snapdev == ZFS_SNAPDEV_VISIBLE) | |
1533 | error = zvol_create_minor_impl(name); | |
1534 | } else { | |
1535 | cookie = spl_fstrans_mark(); | |
1536 | error = dmu_objset_find(parent, zvol_create_minors_cb, | |
1537 | NULL, DS_FIND_CHILDREN); | |
1538 | spl_fstrans_unmark(cookie); | |
1539 | } | |
60101509 | 1540 | |
4e820b5a | 1541 | kmem_free(parent, MAXPATHLEN); |
a08ee875 LG |
1542 | |
1543 | return (SET_ERROR(error)); | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * Remove minors for specified dataset including children and snapshots. | |
1548 | */ | |
4e820b5a AX |
1549 | static void |
1550 | zvol_remove_minors_impl(const char *name) | |
a08ee875 LG |
1551 | { |
1552 | zvol_state_t *zv, *zv_next; | |
1553 | int namelen = ((name) ? strlen(name) : 0); | |
1554 | ||
74497b7a | 1555 | if (zvol_inhibit_dev) |
a08ee875 | 1556 | return; |
74497b7a | 1557 | |
60101509 | 1558 | mutex_enter(&zvol_state_lock); |
a08ee875 LG |
1559 | |
1560 | for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { | |
1561 | zv_next = list_next(&zvol_state_list, zv); | |
1562 | ||
1563 | if (name == NULL || strcmp(zv->zv_name, name) == 0 || | |
1564 | (strncmp(zv->zv_name, name, namelen) == 0 && | |
4e820b5a AX |
1565 | (zv->zv_name[namelen] == '/' || |
1566 | zv->zv_name[namelen] == '@'))) { | |
1567 | ||
1568 | /* If in use, leave alone */ | |
1569 | if (zv->zv_open_count > 0) | |
1570 | continue; | |
1571 | ||
1572 | zvol_remove(zv); | |
1573 | zvol_free(zv); | |
1574 | } | |
1575 | } | |
1576 | ||
1577 | mutex_exit(&zvol_state_lock); | |
1578 | } | |
1579 | ||
1580 | /* Remove minor for this specific snapshot only */ | |
1581 | static void | |
1582 | zvol_remove_minor_impl(const char *name) | |
1583 | { | |
1584 | zvol_state_t *zv, *zv_next; | |
1585 | ||
1586 | if (zvol_inhibit_dev) | |
1587 | return; | |
1588 | ||
1589 | if (strchr(name, '@') == NULL) | |
1590 | return; | |
1591 | ||
1592 | mutex_enter(&zvol_state_lock); | |
1593 | ||
1594 | for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { | |
1595 | zv_next = list_next(&zvol_state_list, zv); | |
1596 | ||
1597 | if (strcmp(zv->zv_name, name) == 0) { | |
1598 | /* If in use, leave alone */ | |
1599 | if (zv->zv_open_count > 0) | |
1600 | continue; | |
a08ee875 LG |
1601 | zvol_remove(zv); |
1602 | zvol_free(zv); | |
4e820b5a | 1603 | break; |
60101509 | 1604 | } |
60101509 | 1605 | } |
60101509 | 1606 | |
a08ee875 | 1607 | mutex_exit(&zvol_state_lock); |
60101509 BB |
1608 | } |
1609 | ||
1610 | /* | |
a08ee875 | 1611 | * Rename minors for specified dataset including children and snapshots. |
60101509 | 1612 | */ |
4e820b5a AX |
1613 | static void |
1614 | zvol_rename_minors_impl(const char *oldname, const char *newname) | |
60101509 BB |
1615 | { |
1616 | zvol_state_t *zv, *zv_next; | |
a08ee875 LG |
1617 | int oldnamelen, newnamelen; |
1618 | char *name; | |
60101509 | 1619 | |
74497b7a DH |
1620 | if (zvol_inhibit_dev) |
1621 | return; | |
1622 | ||
a08ee875 LG |
1623 | oldnamelen = strlen(oldname); |
1624 | newnamelen = strlen(newname); | |
ea04106b | 1625 | name = kmem_alloc(MAXNAMELEN, KM_SLEEP); |
60101509 BB |
1626 | |
1627 | mutex_enter(&zvol_state_lock); | |
a08ee875 | 1628 | |
60101509 BB |
1629 | for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { |
1630 | zv_next = list_next(&zvol_state_list, zv); | |
1631 | ||
4e820b5a AX |
1632 | /* If in use, leave alone */ |
1633 | if (zv->zv_open_count > 0) | |
1634 | continue; | |
1635 | ||
a08ee875 | 1636 | if (strcmp(zv->zv_name, oldname) == 0) { |
4e820b5a | 1637 | zvol_rename_minor(zv, newname); |
a08ee875 LG |
1638 | } else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 && |
1639 | (zv->zv_name[oldnamelen] == '/' || | |
1640 | zv->zv_name[oldnamelen] == '@')) { | |
1641 | snprintf(name, MAXNAMELEN, "%s%c%s", newname, | |
1642 | zv->zv_name[oldnamelen], | |
1643 | zv->zv_name + oldnamelen + 1); | |
4e820b5a | 1644 | zvol_rename_minor(zv, name); |
60101509 BB |
1645 | } |
1646 | } | |
a08ee875 | 1647 | |
60101509 | 1648 | mutex_exit(&zvol_state_lock); |
a08ee875 LG |
1649 | |
1650 | kmem_free(name, MAXNAMELEN); | |
60101509 BB |
1651 | } |
1652 | ||
4e820b5a AX |
1653 | typedef struct zvol_snapdev_cb_arg { |
1654 | uint64_t snapdev; | |
1655 | } zvol_snapdev_cb_arg_t; | |
1656 | ||
0b4d1b58 | 1657 | static int |
4e820b5a AX |
1658 | zvol_set_snapdev_cb(const char *dsname, void *param) { |
1659 | zvol_snapdev_cb_arg_t *arg = param; | |
0b4d1b58 ED |
1660 | |
1661 | if (strchr(dsname, '@') == NULL) | |
a08ee875 | 1662 | return (0); |
0b4d1b58 | 1663 | |
4e820b5a | 1664 | switch (arg->snapdev) { |
0b4d1b58 | 1665 | case ZFS_SNAPDEV_VISIBLE: |
4e820b5a | 1666 | (void) zvol_create_minor_impl(dsname); |
0b4d1b58 ED |
1667 | break; |
1668 | case ZFS_SNAPDEV_HIDDEN: | |
4e820b5a | 1669 | (void) zvol_remove_minor_impl(dsname); |
0b4d1b58 ED |
1670 | break; |
1671 | } | |
a08ee875 LG |
1672 | |
1673 | return (0); | |
0b4d1b58 ED |
1674 | } |
1675 | ||
4e820b5a AX |
1676 | static void |
1677 | zvol_set_snapdev_impl(char *name, uint64_t snapdev) | |
1678 | { | |
1679 | zvol_snapdev_cb_arg_t arg = {snapdev}; | |
1680 | fstrans_cookie_t cookie = spl_fstrans_mark(); | |
1681 | /* | |
1682 | * The zvol_set_snapdev_sync() sets snapdev appropriately | |
1683 | * in the dataset hierarchy. Here, we only scan snapshots. | |
1684 | */ | |
1685 | dmu_objset_find(name, zvol_set_snapdev_cb, &arg, DS_FIND_SNAPSHOTS); | |
1686 | spl_fstrans_unmark(cookie); | |
1687 | } | |
1688 | ||
1689 | static zvol_task_t * | |
1690 | zvol_task_alloc(zvol_async_op_t op, const char *name1, const char *name2, | |
1691 | uint64_t snapdev) | |
1692 | { | |
1693 | zvol_task_t *task; | |
1694 | char *delim; | |
1695 | ||
1696 | /* Never allow tasks on hidden names. */ | |
1697 | if (name1[0] == '$') | |
1698 | return (NULL); | |
1699 | ||
1700 | task = kmem_zalloc(sizeof (zvol_task_t), KM_SLEEP); | |
1701 | task->op = op; | |
1702 | task->snapdev = snapdev; | |
1703 | delim = strchr(name1, '/'); | |
1704 | strlcpy(task->pool, name1, delim ? (delim - name1 + 1) : MAXNAMELEN); | |
1705 | ||
1706 | strlcpy(task->name1, name1, MAXNAMELEN); | |
1707 | if (name2 != NULL) | |
1708 | strlcpy(task->name2, name2, MAXNAMELEN); | |
1709 | ||
1710 | return (task); | |
1711 | } | |
1712 | ||
1713 | static void | |
1714 | zvol_task_free(zvol_task_t *task) | |
1715 | { | |
1716 | kmem_free(task, sizeof (zvol_task_t)); | |
1717 | } | |
1718 | ||
1719 | /* | |
1720 | * The worker thread function performed asynchronously. | |
1721 | */ | |
1722 | static void | |
1723 | zvol_task_cb(void *param) | |
1724 | { | |
1725 | zvol_task_t *task = (zvol_task_t *)param; | |
1726 | ||
1727 | switch (task->op) { | |
1728 | case ZVOL_ASYNC_CREATE_MINORS: | |
1729 | (void) zvol_create_minors_impl(task->name1); | |
1730 | break; | |
1731 | case ZVOL_ASYNC_REMOVE_MINORS: | |
1732 | zvol_remove_minors_impl(task->name1); | |
1733 | break; | |
1734 | case ZVOL_ASYNC_RENAME_MINORS: | |
1735 | zvol_rename_minors_impl(task->name1, task->name2); | |
1736 | break; | |
1737 | case ZVOL_ASYNC_SET_SNAPDEV: | |
1738 | zvol_set_snapdev_impl(task->name1, task->snapdev); | |
1739 | break; | |
1740 | default: | |
1741 | VERIFY(0); | |
1742 | break; | |
1743 | } | |
1744 | ||
1745 | zvol_task_free(task); | |
1746 | } | |
1747 | ||
1748 | typedef struct zvol_set_snapdev_arg { | |
1749 | const char *zsda_name; | |
1750 | uint64_t zsda_value; | |
1751 | zprop_source_t zsda_source; | |
1752 | dmu_tx_t *zsda_tx; | |
1753 | } zvol_set_snapdev_arg_t; | |
1754 | ||
1755 | /* | |
1756 | * Sanity check the dataset for safe use by the sync task. No additional | |
1757 | * conditions are imposed. | |
1758 | */ | |
1759 | static int | |
1760 | zvol_set_snapdev_check(void *arg, dmu_tx_t *tx) | |
1761 | { | |
1762 | zvol_set_snapdev_arg_t *zsda = arg; | |
1763 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
1764 | dsl_dir_t *dd; | |
1765 | int error; | |
1766 | ||
1767 | error = dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL); | |
1768 | if (error != 0) | |
1769 | return (error); | |
1770 | ||
1771 | dsl_dir_rele(dd, FTAG); | |
1772 | ||
1773 | return (error); | |
1774 | } | |
1775 | ||
1776 | static int | |
1777 | zvol_set_snapdev_sync_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) | |
1778 | { | |
1779 | zvol_set_snapdev_arg_t *zsda = arg; | |
1780 | char dsname[MAXNAMELEN]; | |
1781 | zvol_task_t *task; | |
1782 | ||
1783 | dsl_dataset_name(ds, dsname); | |
1784 | dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_SNAPDEV), | |
1785 | zsda->zsda_source, sizeof (zsda->zsda_value), 1, | |
1786 | &zsda->zsda_value, zsda->zsda_tx); | |
1787 | ||
1788 | task = zvol_task_alloc(ZVOL_ASYNC_SET_SNAPDEV, dsname, | |
1789 | NULL, zsda->zsda_value); | |
1790 | if (task == NULL) | |
1791 | return (0); | |
1792 | ||
1793 | (void) taskq_dispatch(dp->dp_spa->spa_zvol_taskq, zvol_task_cb, | |
1794 | task, TQ_SLEEP); | |
1795 | return (0); | |
1796 | } | |
1797 | ||
1798 | /* | |
1799 | * Traverse all child snapshot datasets and apply snapdev appropriately. | |
1800 | */ | |
1801 | static void | |
1802 | zvol_set_snapdev_sync(void *arg, dmu_tx_t *tx) | |
1803 | { | |
1804 | zvol_set_snapdev_arg_t *zsda = arg; | |
1805 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
1806 | dsl_dir_t *dd; | |
1807 | ||
1808 | VERIFY0(dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL)); | |
1809 | zsda->zsda_tx = tx; | |
1810 | ||
1811 | dmu_objset_find_dp(dp, dd->dd_object, zvol_set_snapdev_sync_cb, | |
1812 | zsda, DS_FIND_CHILDREN); | |
1813 | ||
1814 | dsl_dir_rele(dd, FTAG); | |
1815 | } | |
1816 | ||
0b4d1b58 | 1817 | int |
4e820b5a AX |
1818 | zvol_set_snapdev(const char *ddname, zprop_source_t source, uint64_t snapdev) |
1819 | { | |
1820 | zvol_set_snapdev_arg_t zsda; | |
1821 | ||
1822 | zsda.zsda_name = ddname; | |
1823 | zsda.zsda_source = source; | |
1824 | zsda.zsda_value = snapdev; | |
1825 | ||
1826 | return (dsl_sync_task(ddname, zvol_set_snapdev_check, | |
1827 | zvol_set_snapdev_sync, &zsda, 0, ZFS_SPACE_CHECK_NONE)); | |
1828 | } | |
1829 | ||
1830 | void | |
1831 | zvol_create_minors(spa_t *spa, const char *name, boolean_t async) | |
1832 | { | |
1833 | zvol_task_t *task; | |
1834 | taskqid_t id; | |
1835 | ||
1836 | task = zvol_task_alloc(ZVOL_ASYNC_CREATE_MINORS, name, NULL, ~0ULL); | |
1837 | if (task == NULL) | |
1838 | return; | |
1839 | ||
1840 | id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP); | |
1841 | if ((async == B_FALSE) && (id != 0)) | |
1842 | taskq_wait_id(spa->spa_zvol_taskq, id); | |
1843 | } | |
1844 | ||
1845 | void | |
1846 | zvol_remove_minors(spa_t *spa, const char *name, boolean_t async) | |
1847 | { | |
1848 | zvol_task_t *task; | |
1849 | taskqid_t id; | |
1850 | ||
1851 | task = zvol_task_alloc(ZVOL_ASYNC_REMOVE_MINORS, name, NULL, ~0ULL); | |
1852 | if (task == NULL) | |
1853 | return; | |
1854 | ||
1855 | id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP); | |
1856 | if ((async == B_FALSE) && (id != 0)) | |
1857 | taskq_wait_id(spa->spa_zvol_taskq, id); | |
1858 | } | |
1859 | ||
1860 | void | |
1861 | zvol_rename_minors(spa_t *spa, const char *name1, const char *name2, | |
1862 | boolean_t async) | |
1863 | { | |
1864 | zvol_task_t *task; | |
1865 | taskqid_t id; | |
1866 | ||
1867 | task = zvol_task_alloc(ZVOL_ASYNC_RENAME_MINORS, name1, name2, ~0ULL); | |
1868 | if (task == NULL) | |
1869 | return; | |
1870 | ||
1871 | id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP); | |
1872 | if ((async == B_FALSE) && (id != 0)) | |
1873 | taskq_wait_id(spa->spa_zvol_taskq, id); | |
0b4d1b58 ED |
1874 | } |
1875 | ||
60101509 BB |
1876 | int |
1877 | zvol_init(void) | |
1878 | { | |
1879 | int error; | |
1880 | ||
c06d4368 | 1881 | list_create(&zvol_state_list, sizeof (zvol_state_t), |
a08ee875 | 1882 | offsetof(zvol_state_t, zv_next)); |
c06d4368 AX |
1883 | mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); |
1884 | ||
60101509 BB |
1885 | error = register_blkdev(zvol_major, ZVOL_DRIVER); |
1886 | if (error) { | |
1887 | printk(KERN_INFO "ZFS: register_blkdev() failed %d\n", error); | |
e10b0808 | 1888 | goto out; |
60101509 BB |
1889 | } |
1890 | ||
1891 | blk_register_region(MKDEV(zvol_major, 0), 1UL << MINORBITS, | |
a08ee875 | 1892 | THIS_MODULE, zvol_probe, NULL, NULL); |
60101509 | 1893 | |
c06d4368 | 1894 | return (0); |
60101509 | 1895 | |
e10b0808 | 1896 | out: |
c06d4368 AX |
1897 | mutex_destroy(&zvol_state_lock); |
1898 | list_destroy(&zvol_state_list); | |
60101509 | 1899 | |
a08ee875 | 1900 | return (SET_ERROR(error)); |
60101509 BB |
1901 | } |
1902 | ||
1903 | void | |
1904 | zvol_fini(void) | |
1905 | { | |
4e820b5a AX |
1906 | zvol_remove_minors_impl(NULL); |
1907 | ||
60101509 BB |
1908 | blk_unregister_region(MKDEV(zvol_major, 0), 1UL << MINORBITS); |
1909 | unregister_blkdev(zvol_major, ZVOL_DRIVER); | |
4e820b5a | 1910 | |
60101509 | 1911 | list_destroy(&zvol_state_list); |
4e820b5a | 1912 | mutex_destroy(&zvol_state_lock); |
60101509 BB |
1913 | } |
1914 | ||
74497b7a DH |
1915 | module_param(zvol_inhibit_dev, uint, 0644); |
1916 | MODULE_PARM_DESC(zvol_inhibit_dev, "Do not create zvol device nodes"); | |
1917 | ||
30a9524e | 1918 | module_param(zvol_major, uint, 0444); |
60101509 BB |
1919 | MODULE_PARM_DESC(zvol_major, "Major number for zvol device"); |
1920 | ||
7c0e5708 | 1921 | module_param(zvol_max_discard_blocks, ulong, 0444); |
a08ee875 | 1922 | MODULE_PARM_DESC(zvol_max_discard_blocks, "Max number of blocks to discard"); |
e10b0808 AX |
1923 | |
1924 | module_param(zvol_prefetch_bytes, uint, 0644); | |
1925 | MODULE_PARM_DESC(zvol_prefetch_bytes, "Prefetch N bytes at zvol start+end"); |