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34dc7c2f 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 | /* | |
d164b209 | 22 | * Copyright 2009 Sun Microsystems, Inc. All rights reserved. |
34dc7c2f BB |
23 | * Use is subject to license terms. |
24 | */ | |
25 | ||
34dc7c2f BB |
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/zvol/dsk/<pool_name>/<dataset_name> | |
33 | * /dev/zvol/rdsk/<pool_name>/<dataset_name> | |
34 | * | |
35 | * These links are created by the ZFS-specific devfsadm link generator. | |
36 | * Volumes are persistent through reboot. No user command needs to be | |
37 | * run before opening and using a device. | |
38 | */ | |
39 | ||
40 | #include <sys/types.h> | |
41 | #include <sys/param.h> | |
42 | #include <sys/errno.h> | |
43 | #include <sys/uio.h> | |
44 | #include <sys/buf.h> | |
45 | #include <sys/modctl.h> | |
46 | #include <sys/open.h> | |
47 | #include <sys/kmem.h> | |
48 | #include <sys/conf.h> | |
49 | #include <sys/cmn_err.h> | |
50 | #include <sys/stat.h> | |
51 | #include <sys/zap.h> | |
52 | #include <sys/spa.h> | |
53 | #include <sys/zio.h> | |
54 | #include <sys/dmu_traverse.h> | |
55 | #include <sys/dnode.h> | |
56 | #include <sys/dsl_dataset.h> | |
57 | #include <sys/dsl_prop.h> | |
58 | #include <sys/dkio.h> | |
59 | #include <sys/efi_partition.h> | |
60 | #include <sys/byteorder.h> | |
61 | #include <sys/pathname.h> | |
62 | #include <sys/ddi.h> | |
63 | #include <sys/sunddi.h> | |
64 | #include <sys/crc32.h> | |
65 | #include <sys/dirent.h> | |
66 | #include <sys/policy.h> | |
67 | #include <sys/fs/zfs.h> | |
68 | #include <sys/zfs_ioctl.h> | |
69 | #include <sys/mkdev.h> | |
70 | #include <sys/zil.h> | |
71 | #include <sys/refcount.h> | |
72 | #include <sys/zfs_znode.h> | |
73 | #include <sys/zfs_rlock.h> | |
74 | #include <sys/vdev_disk.h> | |
75 | #include <sys/vdev_impl.h> | |
76 | #include <sys/zvol.h> | |
77 | #include <sys/dumphdr.h> | |
fb5f0bc8 | 78 | #include <sys/zil_impl.h> |
34dc7c2f BB |
79 | |
80 | #include "zfs_namecheck.h" | |
81 | ||
82 | static void *zvol_state; | |
83 | ||
84 | #define ZVOL_DUMPSIZE "dumpsize" | |
85 | ||
86 | /* | |
87 | * This lock protects the zvol_state structure from being modified | |
88 | * while it's being used, e.g. an open that comes in before a create | |
89 | * finishes. It also protects temporary opens of the dataset so that, | |
90 | * e.g., an open doesn't get a spurious EBUSY. | |
91 | */ | |
92 | static kmutex_t zvol_state_lock; | |
93 | static uint32_t zvol_minors; | |
94 | ||
34dc7c2f | 95 | typedef struct zvol_extent { |
b128c09f | 96 | list_node_t ze_node; |
34dc7c2f | 97 | dva_t ze_dva; /* dva associated with this extent */ |
b128c09f | 98 | uint64_t ze_nblks; /* number of blocks in extent */ |
34dc7c2f BB |
99 | } zvol_extent_t; |
100 | ||
34dc7c2f BB |
101 | /* |
102 | * The in-core state of each volume. | |
103 | */ | |
104 | typedef struct zvol_state { | |
105 | char zv_name[MAXPATHLEN]; /* pool/dd name */ | |
106 | uint64_t zv_volsize; /* amount of space we advertise */ | |
107 | uint64_t zv_volblocksize; /* volume block size */ | |
108 | minor_t zv_minor; /* minor number */ | |
109 | uint8_t zv_min_bs; /* minimum addressable block shift */ | |
9babb374 | 110 | uint8_t zv_flags; /* readonly, dumpified, etc. */ |
34dc7c2f BB |
111 | objset_t *zv_objset; /* objset handle */ |
112 | uint32_t zv_mode; /* DS_MODE_* flags at open time */ | |
113 | uint32_t zv_open_count[OTYPCNT]; /* open counts */ | |
114 | uint32_t zv_total_opens; /* total open count */ | |
115 | zilog_t *zv_zilog; /* ZIL handle */ | |
b128c09f | 116 | list_t zv_extents; /* List of extents for dump */ |
34dc7c2f BB |
117 | znode_t zv_znode; /* for range locking */ |
118 | } zvol_state_t; | |
119 | ||
120 | /* | |
121 | * zvol specific flags | |
122 | */ | |
123 | #define ZVOL_RDONLY 0x1 | |
124 | #define ZVOL_DUMPIFIED 0x2 | |
b128c09f | 125 | #define ZVOL_EXCL 0x4 |
9babb374 | 126 | #define ZVOL_WCE 0x8 |
34dc7c2f BB |
127 | |
128 | /* | |
129 | * zvol maximum transfer in one DMU tx. | |
130 | */ | |
131 | int zvol_maxphys = DMU_MAX_ACCESS/2; | |
132 | ||
133 | extern int zfs_set_prop_nvlist(const char *, nvlist_t *); | |
134 | static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); | |
135 | static int zvol_dumpify(zvol_state_t *zv); | |
136 | static int zvol_dump_fini(zvol_state_t *zv); | |
137 | static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); | |
138 | ||
139 | static void | |
140 | zvol_size_changed(zvol_state_t *zv, major_t maj) | |
141 | { | |
142 | dev_t dev = makedevice(maj, zv->zv_minor); | |
143 | ||
144 | VERIFY(ddi_prop_update_int64(dev, zfs_dip, | |
145 | "Size", zv->zv_volsize) == DDI_SUCCESS); | |
146 | VERIFY(ddi_prop_update_int64(dev, zfs_dip, | |
147 | "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS); | |
148 | ||
149 | /* Notify specfs to invalidate the cached size */ | |
150 | spec_size_invalidate(dev, VBLK); | |
151 | spec_size_invalidate(dev, VCHR); | |
152 | } | |
153 | ||
154 | int | |
155 | zvol_check_volsize(uint64_t volsize, uint64_t blocksize) | |
156 | { | |
157 | if (volsize == 0) | |
158 | return (EINVAL); | |
159 | ||
160 | if (volsize % blocksize != 0) | |
161 | return (EINVAL); | |
162 | ||
163 | #ifdef _ILP32 | |
164 | if (volsize - 1 > SPEC_MAXOFFSET_T) | |
165 | return (EOVERFLOW); | |
166 | #endif | |
167 | return (0); | |
168 | } | |
169 | ||
170 | int | |
171 | zvol_check_volblocksize(uint64_t volblocksize) | |
172 | { | |
173 | if (volblocksize < SPA_MINBLOCKSIZE || | |
174 | volblocksize > SPA_MAXBLOCKSIZE || | |
175 | !ISP2(volblocksize)) | |
176 | return (EDOM); | |
177 | ||
178 | return (0); | |
179 | } | |
180 | ||
181 | static void | |
182 | zvol_readonly_changed_cb(void *arg, uint64_t newval) | |
183 | { | |
184 | zvol_state_t *zv = arg; | |
185 | ||
186 | if (newval) | |
187 | zv->zv_flags |= ZVOL_RDONLY; | |
188 | else | |
189 | zv->zv_flags &= ~ZVOL_RDONLY; | |
190 | } | |
191 | ||
192 | int | |
193 | zvol_get_stats(objset_t *os, nvlist_t *nv) | |
194 | { | |
195 | int error; | |
196 | dmu_object_info_t doi; | |
197 | uint64_t val; | |
198 | ||
199 | ||
200 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); | |
201 | if (error) | |
202 | return (error); | |
203 | ||
204 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); | |
205 | ||
206 | error = dmu_object_info(os, ZVOL_OBJ, &doi); | |
207 | ||
208 | if (error == 0) { | |
209 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, | |
210 | doi.doi_data_block_size); | |
211 | } | |
212 | ||
213 | return (error); | |
214 | } | |
215 | ||
216 | /* | |
217 | * Find a free minor number. | |
218 | */ | |
219 | static minor_t | |
220 | zvol_minor_alloc(void) | |
221 | { | |
222 | minor_t minor; | |
223 | ||
224 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
225 | ||
226 | for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) | |
227 | if (ddi_get_soft_state(zvol_state, minor) == NULL) | |
228 | return (minor); | |
229 | ||
230 | return (0); | |
231 | } | |
232 | ||
233 | static zvol_state_t * | |
234 | zvol_minor_lookup(const char *name) | |
235 | { | |
236 | minor_t minor; | |
237 | zvol_state_t *zv; | |
238 | ||
239 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
240 | ||
241 | for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { | |
242 | zv = ddi_get_soft_state(zvol_state, minor); | |
243 | if (zv == NULL) | |
244 | continue; | |
245 | if (strcmp(zv->zv_name, name) == 0) | |
246 | break; | |
247 | } | |
248 | ||
249 | return (zv); | |
250 | } | |
251 | ||
34dc7c2f BB |
252 | /* extent mapping arg */ |
253 | struct maparg { | |
b128c09f BB |
254 | zvol_state_t *ma_zv; |
255 | uint64_t ma_blks; | |
34dc7c2f BB |
256 | }; |
257 | ||
258 | /*ARGSUSED*/ | |
259 | static int | |
b128c09f BB |
260 | zvol_map_block(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb, |
261 | const dnode_phys_t *dnp, void *arg) | |
34dc7c2f | 262 | { |
b128c09f BB |
263 | struct maparg *ma = arg; |
264 | zvol_extent_t *ze; | |
265 | int bs = ma->ma_zv->zv_volblocksize; | |
34dc7c2f | 266 | |
b128c09f BB |
267 | if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) |
268 | return (0); | |
34dc7c2f | 269 | |
b128c09f BB |
270 | VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); |
271 | ma->ma_blks++; | |
34dc7c2f | 272 | |
b128c09f BB |
273 | /* Abort immediately if we have encountered gang blocks */ |
274 | if (BP_IS_GANG(bp)) | |
275 | return (EFRAGS); | |
34dc7c2f | 276 | |
b128c09f BB |
277 | /* |
278 | * See if the block is at the end of the previous extent. | |
279 | */ | |
280 | ze = list_tail(&ma->ma_zv->zv_extents); | |
281 | if (ze && | |
282 | DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && | |
283 | DVA_GET_OFFSET(BP_IDENTITY(bp)) == | |
284 | DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { | |
285 | ze->ze_nblks++; | |
286 | return (0); | |
34dc7c2f | 287 | } |
34dc7c2f | 288 | |
b128c09f | 289 | dprintf_bp(bp, "%s", "next blkptr:"); |
34dc7c2f | 290 | |
b128c09f BB |
291 | /* start a new extent */ |
292 | ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); | |
293 | ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ | |
294 | ze->ze_nblks = 1; | |
295 | list_insert_tail(&ma->ma_zv->zv_extents, ze); | |
296 | return (0); | |
297 | } | |
34dc7c2f | 298 | |
b128c09f BB |
299 | static void |
300 | zvol_free_extents(zvol_state_t *zv) | |
301 | { | |
302 | zvol_extent_t *ze; | |
34dc7c2f | 303 | |
b128c09f BB |
304 | while (ze = list_head(&zv->zv_extents)) { |
305 | list_remove(&zv->zv_extents, ze); | |
306 | kmem_free(ze, sizeof (zvol_extent_t)); | |
34dc7c2f | 307 | } |
b128c09f | 308 | } |
34dc7c2f | 309 | |
b128c09f BB |
310 | static int |
311 | zvol_get_lbas(zvol_state_t *zv) | |
312 | { | |
313 | struct maparg ma; | |
314 | int err; | |
315 | ||
316 | ma.ma_zv = zv; | |
317 | ma.ma_blks = 0; | |
318 | zvol_free_extents(zv); | |
319 | ||
320 | err = traverse_dataset(dmu_objset_ds(zv->zv_objset), 0, | |
321 | TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); | |
322 | if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { | |
323 | zvol_free_extents(zv); | |
324 | return (err ? err : EIO); | |
34dc7c2f | 325 | } |
b128c09f | 326 | |
34dc7c2f BB |
327 | return (0); |
328 | } | |
329 | ||
330 | /* ARGSUSED */ | |
331 | void | |
332 | zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) | |
333 | { | |
334 | zfs_creat_t *zct = arg; | |
335 | nvlist_t *nvprops = zct->zct_props; | |
336 | int error; | |
337 | uint64_t volblocksize, volsize; | |
338 | ||
339 | VERIFY(nvlist_lookup_uint64(nvprops, | |
340 | zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); | |
341 | if (nvlist_lookup_uint64(nvprops, | |
342 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) | |
343 | volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); | |
344 | ||
345 | /* | |
346 | * These properties must be removed from the list so the generic | |
347 | * property setting step won't apply to them. | |
348 | */ | |
349 | VERIFY(nvlist_remove_all(nvprops, | |
350 | zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); | |
351 | (void) nvlist_remove_all(nvprops, | |
352 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); | |
353 | ||
354 | error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, | |
355 | DMU_OT_NONE, 0, tx); | |
356 | ASSERT(error == 0); | |
357 | ||
358 | error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, | |
359 | DMU_OT_NONE, 0, tx); | |
360 | ASSERT(error == 0); | |
361 | ||
362 | error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); | |
363 | ASSERT(error == 0); | |
364 | } | |
365 | ||
366 | /* | |
367 | * Replay a TX_WRITE ZIL transaction that didn't get committed | |
368 | * after a system failure | |
369 | */ | |
370 | static int | |
371 | zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) | |
372 | { | |
373 | objset_t *os = zv->zv_objset; | |
374 | char *data = (char *)(lr + 1); /* data follows lr_write_t */ | |
375 | uint64_t off = lr->lr_offset; | |
376 | uint64_t len = lr->lr_length; | |
377 | dmu_tx_t *tx; | |
378 | int error; | |
379 | ||
380 | if (byteswap) | |
381 | byteswap_uint64_array(lr, sizeof (*lr)); | |
382 | ||
383 | tx = dmu_tx_create(os); | |
384 | dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); | |
fb5f0bc8 | 385 | error = dmu_tx_assign(tx, TXG_WAIT); |
34dc7c2f BB |
386 | if (error) { |
387 | dmu_tx_abort(tx); | |
388 | } else { | |
389 | dmu_write(os, ZVOL_OBJ, off, len, data, tx); | |
390 | dmu_tx_commit(tx); | |
391 | } | |
392 | ||
393 | return (error); | |
394 | } | |
395 | ||
396 | /* ARGSUSED */ | |
397 | static int | |
398 | zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) | |
399 | { | |
400 | return (ENOTSUP); | |
401 | } | |
402 | ||
403 | /* | |
404 | * Callback vectors for replaying records. | |
405 | * Only TX_WRITE is needed for zvol. | |
406 | */ | |
407 | zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { | |
408 | zvol_replay_err, /* 0 no such transaction type */ | |
409 | zvol_replay_err, /* TX_CREATE */ | |
410 | zvol_replay_err, /* TX_MKDIR */ | |
411 | zvol_replay_err, /* TX_MKXATTR */ | |
412 | zvol_replay_err, /* TX_SYMLINK */ | |
413 | zvol_replay_err, /* TX_REMOVE */ | |
414 | zvol_replay_err, /* TX_RMDIR */ | |
415 | zvol_replay_err, /* TX_LINK */ | |
416 | zvol_replay_err, /* TX_RENAME */ | |
417 | zvol_replay_write, /* TX_WRITE */ | |
418 | zvol_replay_err, /* TX_TRUNCATE */ | |
419 | zvol_replay_err, /* TX_SETATTR */ | |
420 | zvol_replay_err, /* TX_ACL */ | |
421 | }; | |
422 | ||
34dc7c2f BB |
423 | /* |
424 | * Create a minor node (plus a whole lot more) for the specified volume. | |
425 | */ | |
426 | int | |
427 | zvol_create_minor(const char *name, major_t maj) | |
428 | { | |
429 | zvol_state_t *zv; | |
430 | objset_t *os; | |
431 | dmu_object_info_t doi; | |
432 | uint64_t volsize; | |
433 | minor_t minor = 0; | |
434 | struct pathname linkpath; | |
b128c09f | 435 | int ds_mode = DS_MODE_OWNER; |
34dc7c2f BB |
436 | vnode_t *vp = NULL; |
437 | char *devpath; | |
438 | size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 1; | |
439 | char chrbuf[30], blkbuf[30]; | |
440 | int error; | |
441 | ||
442 | mutex_enter(&zvol_state_lock); | |
443 | ||
444 | if ((zv = zvol_minor_lookup(name)) != NULL) { | |
445 | mutex_exit(&zvol_state_lock); | |
446 | return (EEXIST); | |
447 | } | |
448 | ||
449 | if (strchr(name, '@') != 0) | |
450 | ds_mode |= DS_MODE_READONLY; | |
451 | ||
452 | error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); | |
453 | ||
454 | if (error) { | |
455 | mutex_exit(&zvol_state_lock); | |
456 | return (error); | |
457 | } | |
458 | ||
459 | error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); | |
460 | ||
461 | if (error) { | |
462 | dmu_objset_close(os); | |
463 | mutex_exit(&zvol_state_lock); | |
464 | return (error); | |
465 | } | |
466 | ||
467 | /* | |
468 | * If there's an existing /dev/zvol symlink, try to use the | |
469 | * same minor number we used last time. | |
470 | */ | |
471 | devpath = kmem_alloc(devpathlen, KM_SLEEP); | |
472 | ||
473 | (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, name); | |
474 | ||
475 | error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); | |
476 | ||
477 | kmem_free(devpath, devpathlen); | |
478 | ||
479 | if (error == 0 && vp->v_type != VLNK) | |
480 | error = EINVAL; | |
481 | ||
482 | if (error == 0) { | |
483 | pn_alloc(&linkpath); | |
484 | error = pn_getsymlink(vp, &linkpath, kcred); | |
485 | if (error == 0) { | |
486 | char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); | |
487 | if (ms != NULL) { | |
488 | ms += strlen(ZVOL_PSEUDO_DEV); | |
489 | minor = stoi(&ms); | |
490 | } | |
491 | } | |
492 | pn_free(&linkpath); | |
493 | } | |
494 | ||
495 | if (vp != NULL) | |
496 | VN_RELE(vp); | |
497 | ||
498 | /* | |
499 | * If we found a minor but it's already in use, we must pick a new one. | |
500 | */ | |
501 | if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) | |
502 | minor = 0; | |
503 | ||
504 | if (minor == 0) | |
505 | minor = zvol_minor_alloc(); | |
506 | ||
507 | if (minor == 0) { | |
508 | dmu_objset_close(os); | |
509 | mutex_exit(&zvol_state_lock); | |
510 | return (ENXIO); | |
511 | } | |
512 | ||
513 | if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { | |
514 | dmu_objset_close(os); | |
515 | mutex_exit(&zvol_state_lock); | |
516 | return (EAGAIN); | |
517 | } | |
518 | ||
519 | (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, | |
520 | (char *)name); | |
521 | ||
522 | (void) sprintf(chrbuf, "%uc,raw", minor); | |
523 | ||
524 | if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, | |
525 | minor, DDI_PSEUDO, 0) == DDI_FAILURE) { | |
526 | ddi_soft_state_free(zvol_state, minor); | |
527 | dmu_objset_close(os); | |
528 | mutex_exit(&zvol_state_lock); | |
529 | return (EAGAIN); | |
530 | } | |
531 | ||
532 | (void) sprintf(blkbuf, "%uc", minor); | |
533 | ||
534 | if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, | |
535 | minor, DDI_PSEUDO, 0) == DDI_FAILURE) { | |
536 | ddi_remove_minor_node(zfs_dip, chrbuf); | |
537 | ddi_soft_state_free(zvol_state, minor); | |
538 | dmu_objset_close(os); | |
539 | mutex_exit(&zvol_state_lock); | |
540 | return (EAGAIN); | |
541 | } | |
542 | ||
543 | zv = ddi_get_soft_state(zvol_state, minor); | |
544 | ||
545 | (void) strcpy(zv->zv_name, name); | |
546 | zv->zv_min_bs = DEV_BSHIFT; | |
547 | zv->zv_minor = minor; | |
548 | zv->zv_volsize = volsize; | |
549 | zv->zv_objset = os; | |
550 | zv->zv_mode = ds_mode; | |
551 | zv->zv_zilog = zil_open(os, zvol_get_data); | |
552 | mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); | |
553 | avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, | |
554 | sizeof (rl_t), offsetof(rl_t, r_node)); | |
b128c09f BB |
555 | list_create(&zv->zv_extents, sizeof (zvol_extent_t), |
556 | offsetof(zvol_extent_t, ze_node)); | |
34dc7c2f BB |
557 | /* get and cache the blocksize */ |
558 | error = dmu_object_info(os, ZVOL_OBJ, &doi); | |
559 | ASSERT(error == 0); | |
560 | zv->zv_volblocksize = doi.doi_data_block_size; | |
561 | ||
fb5f0bc8 | 562 | zil_replay(os, zv, zvol_replay_vector); |
34dc7c2f BB |
563 | zvol_size_changed(zv, maj); |
564 | ||
565 | /* XXX this should handle the possible i/o error */ | |
566 | VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), | |
567 | "readonly", zvol_readonly_changed_cb, zv) == 0); | |
568 | ||
569 | zvol_minors++; | |
570 | ||
571 | mutex_exit(&zvol_state_lock); | |
572 | ||
573 | return (0); | |
574 | } | |
575 | ||
576 | /* | |
577 | * Remove minor node for the specified volume. | |
578 | */ | |
579 | int | |
580 | zvol_remove_minor(const char *name) | |
581 | { | |
582 | zvol_state_t *zv; | |
583 | char namebuf[30]; | |
584 | ||
585 | mutex_enter(&zvol_state_lock); | |
586 | ||
587 | if ((zv = zvol_minor_lookup(name)) == NULL) { | |
588 | mutex_exit(&zvol_state_lock); | |
589 | return (ENXIO); | |
590 | } | |
591 | ||
592 | if (zv->zv_total_opens != 0) { | |
593 | mutex_exit(&zvol_state_lock); | |
594 | return (EBUSY); | |
595 | } | |
596 | ||
597 | (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); | |
598 | ddi_remove_minor_node(zfs_dip, namebuf); | |
599 | ||
600 | (void) sprintf(namebuf, "%uc", zv->zv_minor); | |
601 | ddi_remove_minor_node(zfs_dip, namebuf); | |
602 | ||
603 | VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), | |
604 | "readonly", zvol_readonly_changed_cb, zv) == 0); | |
605 | ||
606 | zil_close(zv->zv_zilog); | |
607 | zv->zv_zilog = NULL; | |
608 | dmu_objset_close(zv->zv_objset); | |
609 | zv->zv_objset = NULL; | |
610 | avl_destroy(&zv->zv_znode.z_range_avl); | |
611 | mutex_destroy(&zv->zv_znode.z_range_lock); | |
612 | ||
613 | ddi_soft_state_free(zvol_state, zv->zv_minor); | |
614 | ||
615 | zvol_minors--; | |
616 | ||
617 | mutex_exit(&zvol_state_lock); | |
618 | ||
619 | return (0); | |
620 | } | |
621 | ||
34dc7c2f BB |
622 | int |
623 | zvol_prealloc(zvol_state_t *zv) | |
624 | { | |
625 | objset_t *os = zv->zv_objset; | |
626 | dmu_tx_t *tx; | |
34dc7c2f BB |
627 | uint64_t refd, avail, usedobjs, availobjs; |
628 | uint64_t resid = zv->zv_volsize; | |
629 | uint64_t off = 0; | |
630 | ||
631 | /* Check the space usage before attempting to allocate the space */ | |
632 | dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); | |
633 | if (avail < zv->zv_volsize) | |
634 | return (ENOSPC); | |
635 | ||
636 | /* Free old extents if they exist */ | |
637 | zvol_free_extents(zv); | |
638 | ||
34dc7c2f BB |
639 | while (resid != 0) { |
640 | int error; | |
641 | uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE); | |
642 | ||
643 | tx = dmu_tx_create(os); | |
644 | dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); | |
645 | error = dmu_tx_assign(tx, TXG_WAIT); | |
646 | if (error) { | |
647 | dmu_tx_abort(tx); | |
b128c09f | 648 | (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); |
34dc7c2f BB |
649 | return (error); |
650 | } | |
b128c09f | 651 | dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); |
34dc7c2f BB |
652 | dmu_tx_commit(tx); |
653 | off += bytes; | |
654 | resid -= bytes; | |
655 | } | |
34dc7c2f BB |
656 | txg_wait_synced(dmu_objset_pool(os), 0); |
657 | ||
658 | return (0); | |
659 | } | |
660 | ||
661 | int | |
662 | zvol_update_volsize(zvol_state_t *zv, major_t maj, uint64_t volsize) | |
663 | { | |
664 | dmu_tx_t *tx; | |
665 | int error; | |
666 | ||
667 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
668 | ||
669 | tx = dmu_tx_create(zv->zv_objset); | |
670 | dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); | |
34dc7c2f BB |
671 | error = dmu_tx_assign(tx, TXG_WAIT); |
672 | if (error) { | |
673 | dmu_tx_abort(tx); | |
674 | return (error); | |
675 | } | |
676 | ||
677 | error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, | |
678 | &volsize, tx); | |
679 | dmu_tx_commit(tx); | |
680 | ||
681 | if (error == 0) | |
b128c09f BB |
682 | error = dmu_free_long_range(zv->zv_objset, |
683 | ZVOL_OBJ, volsize, DMU_OBJECT_END); | |
34dc7c2f | 684 | |
b128c09f BB |
685 | /* |
686 | * If we are using a faked-up state (zv_minor == 0) then don't | |
687 | * try to update the in-core zvol state. | |
688 | */ | |
689 | if (error == 0 && zv->zv_minor) { | |
34dc7c2f BB |
690 | zv->zv_volsize = volsize; |
691 | zvol_size_changed(zv, maj); | |
692 | } | |
693 | return (error); | |
694 | } | |
695 | ||
696 | int | |
697 | zvol_set_volsize(const char *name, major_t maj, uint64_t volsize) | |
698 | { | |
699 | zvol_state_t *zv; | |
700 | int error; | |
701 | dmu_object_info_t doi; | |
702 | uint64_t old_volsize = 0ULL; | |
b128c09f | 703 | zvol_state_t state = { 0 }; |
34dc7c2f BB |
704 | |
705 | mutex_enter(&zvol_state_lock); | |
706 | ||
707 | if ((zv = zvol_minor_lookup(name)) == NULL) { | |
b128c09f BB |
708 | /* |
709 | * If we are doing a "zfs clone -o volsize=", then the | |
710 | * minor node won't exist yet. | |
711 | */ | |
712 | error = dmu_objset_open(name, DMU_OST_ZVOL, DS_MODE_OWNER, | |
713 | &state.zv_objset); | |
714 | if (error != 0) | |
715 | goto out; | |
716 | zv = &state; | |
34dc7c2f BB |
717 | } |
718 | old_volsize = zv->zv_volsize; | |
719 | ||
720 | if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || | |
721 | (error = zvol_check_volsize(volsize, | |
b128c09f BB |
722 | doi.doi_data_block_size)) != 0) |
723 | goto out; | |
34dc7c2f BB |
724 | |
725 | if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) { | |
b128c09f BB |
726 | error = EROFS; |
727 | goto out; | |
34dc7c2f BB |
728 | } |
729 | ||
730 | error = zvol_update_volsize(zv, maj, volsize); | |
731 | ||
732 | /* | |
733 | * Reinitialize the dump area to the new size. If we | |
734 | * failed to resize the dump area then restore the it back to | |
735 | * it's original size. | |
736 | */ | |
737 | if (error == 0 && zv->zv_flags & ZVOL_DUMPIFIED) { | |
738 | if ((error = zvol_dumpify(zv)) != 0 || | |
739 | (error = dumpvp_resize()) != 0) { | |
740 | (void) zvol_update_volsize(zv, maj, old_volsize); | |
741 | error = zvol_dumpify(zv); | |
742 | } | |
743 | } | |
744 | ||
9babb374 BB |
745 | /* |
746 | * Generate a LUN expansion event. | |
747 | */ | |
748 | if (error == 0) { | |
749 | sysevent_id_t eid; | |
750 | nvlist_t *attr; | |
751 | char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); | |
752 | ||
753 | (void) snprintf(physpath, MAXPATHLEN, "%s%uc", ZVOL_PSEUDO_DEV, | |
754 | zv->zv_minor); | |
755 | ||
756 | VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); | |
757 | VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); | |
758 | ||
759 | (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, | |
760 | ESC_DEV_DLE, attr, &eid, DDI_SLEEP); | |
761 | ||
762 | nvlist_free(attr); | |
763 | kmem_free(physpath, MAXPATHLEN); | |
764 | } | |
765 | ||
b128c09f BB |
766 | out: |
767 | if (state.zv_objset) | |
768 | dmu_objset_close(state.zv_objset); | |
769 | ||
34dc7c2f BB |
770 | mutex_exit(&zvol_state_lock); |
771 | ||
772 | return (error); | |
773 | } | |
774 | ||
775 | int | |
776 | zvol_set_volblocksize(const char *name, uint64_t volblocksize) | |
777 | { | |
778 | zvol_state_t *zv; | |
779 | dmu_tx_t *tx; | |
780 | int error; | |
b128c09f | 781 | boolean_t needlock; |
34dc7c2f | 782 | |
b128c09f BB |
783 | /* |
784 | * The lock may already be held if we are being called from | |
785 | * zvol_dump_init(). | |
786 | */ | |
787 | needlock = !MUTEX_HELD(&zvol_state_lock); | |
788 | if (needlock) | |
789 | mutex_enter(&zvol_state_lock); | |
34dc7c2f BB |
790 | |
791 | if ((zv = zvol_minor_lookup(name)) == NULL) { | |
b128c09f BB |
792 | if (needlock) |
793 | mutex_exit(&zvol_state_lock); | |
34dc7c2f BB |
794 | return (ENXIO); |
795 | } | |
796 | if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) { | |
b128c09f BB |
797 | if (needlock) |
798 | mutex_exit(&zvol_state_lock); | |
34dc7c2f BB |
799 | return (EROFS); |
800 | } | |
801 | ||
802 | tx = dmu_tx_create(zv->zv_objset); | |
803 | dmu_tx_hold_bonus(tx, ZVOL_OBJ); | |
804 | error = dmu_tx_assign(tx, TXG_WAIT); | |
805 | if (error) { | |
806 | dmu_tx_abort(tx); | |
807 | } else { | |
808 | error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, | |
809 | volblocksize, 0, tx); | |
810 | if (error == ENOTSUP) | |
811 | error = EBUSY; | |
812 | dmu_tx_commit(tx); | |
b128c09f BB |
813 | if (error == 0) |
814 | zv->zv_volblocksize = volblocksize; | |
34dc7c2f BB |
815 | } |
816 | ||
b128c09f BB |
817 | if (needlock) |
818 | mutex_exit(&zvol_state_lock); | |
34dc7c2f BB |
819 | |
820 | return (error); | |
821 | } | |
822 | ||
823 | /*ARGSUSED*/ | |
824 | int | |
825 | zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) | |
826 | { | |
827 | minor_t minor = getminor(*devp); | |
828 | zvol_state_t *zv; | |
829 | ||
830 | if (minor == 0) /* This is the control device */ | |
831 | return (0); | |
832 | ||
833 | mutex_enter(&zvol_state_lock); | |
834 | ||
835 | zv = ddi_get_soft_state(zvol_state, minor); | |
836 | if (zv == NULL) { | |
837 | mutex_exit(&zvol_state_lock); | |
838 | return (ENXIO); | |
839 | } | |
840 | ||
841 | ASSERT(zv->zv_objset != NULL); | |
842 | ||
843 | if ((flag & FWRITE) && | |
844 | (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))) { | |
845 | mutex_exit(&zvol_state_lock); | |
846 | return (EROFS); | |
847 | } | |
b128c09f BB |
848 | if (zv->zv_flags & ZVOL_EXCL) { |
849 | mutex_exit(&zvol_state_lock); | |
850 | return (EBUSY); | |
851 | } | |
852 | if (flag & FEXCL) { | |
853 | if (zv->zv_total_opens != 0) { | |
854 | mutex_exit(&zvol_state_lock); | |
855 | return (EBUSY); | |
856 | } | |
857 | zv->zv_flags |= ZVOL_EXCL; | |
858 | } | |
34dc7c2f BB |
859 | |
860 | if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { | |
861 | zv->zv_open_count[otyp]++; | |
862 | zv->zv_total_opens++; | |
863 | } | |
864 | ||
865 | mutex_exit(&zvol_state_lock); | |
866 | ||
867 | return (0); | |
868 | } | |
869 | ||
870 | /*ARGSUSED*/ | |
871 | int | |
872 | zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) | |
873 | { | |
874 | minor_t minor = getminor(dev); | |
875 | zvol_state_t *zv; | |
876 | ||
877 | if (minor == 0) /* This is the control device */ | |
878 | return (0); | |
879 | ||
880 | mutex_enter(&zvol_state_lock); | |
881 | ||
882 | zv = ddi_get_soft_state(zvol_state, minor); | |
883 | if (zv == NULL) { | |
884 | mutex_exit(&zvol_state_lock); | |
885 | return (ENXIO); | |
886 | } | |
887 | ||
b128c09f BB |
888 | if (zv->zv_flags & ZVOL_EXCL) { |
889 | ASSERT(zv->zv_total_opens == 1); | |
890 | zv->zv_flags &= ~ZVOL_EXCL; | |
34dc7c2f BB |
891 | } |
892 | ||
893 | /* | |
894 | * If the open count is zero, this is a spurious close. | |
895 | * That indicates a bug in the kernel / DDI framework. | |
896 | */ | |
897 | ASSERT(zv->zv_open_count[otyp] != 0); | |
898 | ASSERT(zv->zv_total_opens != 0); | |
899 | ||
900 | /* | |
901 | * You may get multiple opens, but only one close. | |
902 | */ | |
903 | zv->zv_open_count[otyp]--; | |
904 | zv->zv_total_opens--; | |
905 | ||
906 | mutex_exit(&zvol_state_lock); | |
907 | ||
908 | return (0); | |
909 | } | |
910 | ||
911 | static void | |
912 | zvol_get_done(dmu_buf_t *db, void *vzgd) | |
913 | { | |
914 | zgd_t *zgd = (zgd_t *)vzgd; | |
915 | rl_t *rl = zgd->zgd_rl; | |
916 | ||
917 | dmu_buf_rele(db, vzgd); | |
918 | zfs_range_unlock(rl); | |
919 | zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); | |
920 | kmem_free(zgd, sizeof (zgd_t)); | |
921 | } | |
922 | ||
923 | /* | |
924 | * Get data to generate a TX_WRITE intent log record. | |
925 | */ | |
926 | static int | |
927 | zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) | |
928 | { | |
929 | zvol_state_t *zv = arg; | |
930 | objset_t *os = zv->zv_objset; | |
931 | dmu_buf_t *db; | |
932 | rl_t *rl; | |
933 | zgd_t *zgd; | |
934 | uint64_t boff; /* block starting offset */ | |
935 | int dlen = lr->lr_length; /* length of user data */ | |
936 | int error; | |
937 | ||
938 | ASSERT(zio); | |
939 | ASSERT(dlen != 0); | |
940 | ||
941 | /* | |
942 | * Write records come in two flavors: immediate and indirect. | |
943 | * For small writes it's cheaper to store the data with the | |
944 | * log record (immediate); for large writes it's cheaper to | |
945 | * sync the data and get a pointer to it (indirect) so that | |
946 | * we don't have to write the data twice. | |
947 | */ | |
948 | if (buf != NULL) /* immediate write */ | |
9babb374 BB |
949 | return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf, |
950 | DMU_READ_NO_PREFETCH)); | |
34dc7c2f BB |
951 | |
952 | zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP); | |
953 | zgd->zgd_zilog = zv->zv_zilog; | |
954 | zgd->zgd_bp = &lr->lr_blkptr; | |
955 | ||
956 | /* | |
957 | * Lock the range of the block to ensure that when the data is | |
958 | * written out and its checksum is being calculated that no other | |
959 | * thread can change the block. | |
960 | */ | |
961 | boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t); | |
962 | rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize, | |
963 | RL_READER); | |
964 | zgd->zgd_rl = rl; | |
965 | ||
966 | VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db)); | |
967 | error = dmu_sync(zio, db, &lr->lr_blkptr, | |
968 | lr->lr_common.lrc_txg, zvol_get_done, zgd); | |
969 | if (error == 0) | |
970 | zil_add_block(zv->zv_zilog, &lr->lr_blkptr); | |
971 | /* | |
972 | * If we get EINPROGRESS, then we need to wait for a | |
973 | * write IO initiated by dmu_sync() to complete before | |
974 | * we can release this dbuf. We will finish everything | |
975 | * up in the zvol_get_done() callback. | |
976 | */ | |
977 | if (error == EINPROGRESS) | |
978 | return (0); | |
979 | dmu_buf_rele(db, zgd); | |
980 | zfs_range_unlock(rl); | |
981 | kmem_free(zgd, sizeof (zgd_t)); | |
982 | return (error); | |
983 | } | |
984 | ||
985 | /* | |
986 | * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. | |
987 | * | |
988 | * We store data in the log buffers if it's small enough. | |
989 | * Otherwise we will later flush the data out via dmu_sync(). | |
990 | */ | |
991 | ssize_t zvol_immediate_write_sz = 32768; | |
992 | ||
993 | static void | |
9babb374 BB |
994 | zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, |
995 | boolean_t sync) | |
34dc7c2f BB |
996 | { |
997 | uint32_t blocksize = zv->zv_volblocksize; | |
fb5f0bc8 | 998 | zilog_t *zilog = zv->zv_zilog; |
9babb374 BB |
999 | boolean_t slogging; |
1000 | ||
1001 | if (zil_disable) | |
1002 | return; | |
34dc7c2f | 1003 | |
fb5f0bc8 BB |
1004 | if (zilog->zl_replay) { |
1005 | dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); | |
1006 | zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] = | |
1007 | zilog->zl_replaying_seq; | |
1008 | return; | |
1009 | } | |
1010 | ||
9babb374 | 1011 | slogging = spa_has_slogs(zilog->zl_spa); |
34dc7c2f | 1012 | |
9babb374 BB |
1013 | while (resid) { |
1014 | itx_t *itx; | |
1015 | lr_write_t *lr; | |
1016 | ssize_t len; | |
1017 | itx_wr_state_t write_state; | |
1018 | ||
1019 | /* | |
1020 | * Unlike zfs_log_write() we can be called with | |
1021 | * upto DMU_MAX_ACCESS/2 (5MB) writes. | |
1022 | */ | |
1023 | if (blocksize > zvol_immediate_write_sz && !slogging && | |
1024 | resid >= blocksize && off % blocksize == 0) { | |
1025 | write_state = WR_INDIRECT; /* uses dmu_sync */ | |
1026 | len = blocksize; | |
1027 | } else if (sync) { | |
1028 | write_state = WR_COPIED; | |
1029 | len = MIN(ZIL_MAX_LOG_DATA, resid); | |
1030 | } else { | |
1031 | write_state = WR_NEED_COPY; | |
1032 | len = MIN(ZIL_MAX_LOG_DATA, resid); | |
1033 | } | |
1034 | ||
1035 | itx = zil_itx_create(TX_WRITE, sizeof (*lr) + | |
1036 | (write_state == WR_COPIED ? len : 0)); | |
34dc7c2f | 1037 | lr = (lr_write_t *)&itx->itx_lr; |
9babb374 BB |
1038 | if (write_state == WR_COPIED && dmu_read(zv->zv_objset, |
1039 | ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { | |
1040 | kmem_free(itx, offsetof(itx_t, itx_lr) + | |
1041 | itx->itx_lr.lrc_reclen); | |
1042 | itx = zil_itx_create(TX_WRITE, sizeof (*lr)); | |
1043 | lr = (lr_write_t *)&itx->itx_lr; | |
1044 | write_state = WR_NEED_COPY; | |
1045 | } | |
1046 | ||
1047 | itx->itx_wr_state = write_state; | |
1048 | if (write_state == WR_NEED_COPY) | |
1049 | itx->itx_sod += len; | |
34dc7c2f BB |
1050 | lr->lr_foid = ZVOL_OBJ; |
1051 | lr->lr_offset = off; | |
9babb374 | 1052 | lr->lr_length = len; |
34dc7c2f BB |
1053 | lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t); |
1054 | BP_ZERO(&lr->lr_blkptr); | |
1055 | ||
9babb374 BB |
1056 | itx->itx_private = zv; |
1057 | itx->itx_sync = sync; | |
1058 | ||
fb5f0bc8 | 1059 | (void) zil_itx_assign(zilog, itx, tx); |
9babb374 BB |
1060 | |
1061 | off += len; | |
1062 | resid -= len; | |
34dc7c2f BB |
1063 | } |
1064 | } | |
1065 | ||
b128c09f BB |
1066 | static int |
1067 | zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size, | |
1068 | boolean_t doread, boolean_t isdump) | |
34dc7c2f BB |
1069 | { |
1070 | vdev_disk_t *dvd; | |
34dc7c2f BB |
1071 | int c; |
1072 | int numerrors = 0; | |
1073 | ||
1074 | for (c = 0; c < vd->vdev_children; c++) { | |
9babb374 BB |
1075 | ASSERT(vd->vdev_ops == &vdev_mirror_ops || |
1076 | vd->vdev_ops == &vdev_replacing_ops || | |
1077 | vd->vdev_ops == &vdev_spare_ops); | |
b128c09f BB |
1078 | int err = zvol_dumpio_vdev(vd->vdev_child[c], |
1079 | addr, offset, size, doread, isdump); | |
1080 | if (err != 0) { | |
34dc7c2f | 1081 | numerrors++; |
b128c09f | 1082 | } else if (doread) { |
34dc7c2f BB |
1083 | break; |
1084 | } | |
1085 | } | |
1086 | ||
1087 | if (!vd->vdev_ops->vdev_op_leaf) | |
1088 | return (numerrors < vd->vdev_children ? 0 : EIO); | |
1089 | ||
b128c09f BB |
1090 | if (doread && !vdev_readable(vd)) |
1091 | return (EIO); | |
1092 | else if (!doread && !vdev_writeable(vd)) | |
34dc7c2f BB |
1093 | return (EIO); |
1094 | ||
1095 | dvd = vd->vdev_tsd; | |
1096 | ASSERT3P(dvd, !=, NULL); | |
34dc7c2f BB |
1097 | offset += VDEV_LABEL_START_SIZE; |
1098 | ||
1099 | if (ddi_in_panic() || isdump) { | |
b128c09f BB |
1100 | ASSERT(!doread); |
1101 | if (doread) | |
34dc7c2f BB |
1102 | return (EIO); |
1103 | return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), | |
1104 | lbtodb(size))); | |
1105 | } else { | |
1106 | return (vdev_disk_physio(dvd->vd_lh, addr, size, offset, | |
b128c09f | 1107 | doread ? B_READ : B_WRITE)); |
34dc7c2f BB |
1108 | } |
1109 | } | |
1110 | ||
b128c09f BB |
1111 | static int |
1112 | zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, | |
1113 | boolean_t doread, boolean_t isdump) | |
34dc7c2f | 1114 | { |
34dc7c2f BB |
1115 | vdev_t *vd; |
1116 | int error; | |
b128c09f | 1117 | zvol_extent_t *ze; |
34dc7c2f BB |
1118 | spa_t *spa = dmu_objset_spa(zv->zv_objset); |
1119 | ||
b128c09f BB |
1120 | /* Must be sector aligned, and not stradle a block boundary. */ |
1121 | if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || | |
1122 | P2BOUNDARY(offset, size, zv->zv_volblocksize)) { | |
34dc7c2f | 1123 | return (EINVAL); |
b128c09f BB |
1124 | } |
1125 | ASSERT(size <= zv->zv_volblocksize); | |
34dc7c2f | 1126 | |
b128c09f BB |
1127 | /* Locate the extent this belongs to */ |
1128 | ze = list_head(&zv->zv_extents); | |
1129 | while (offset >= ze->ze_nblks * zv->zv_volblocksize) { | |
1130 | offset -= ze->ze_nblks * zv->zv_volblocksize; | |
1131 | ze = list_next(&zv->zv_extents, ze); | |
1132 | } | |
1133 | spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); | |
1134 | vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); | |
1135 | offset += DVA_GET_OFFSET(&ze->ze_dva); | |
1136 | error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump); | |
1137 | spa_config_exit(spa, SCL_STATE, FTAG); | |
34dc7c2f BB |
1138 | return (error); |
1139 | } | |
1140 | ||
1141 | int | |
1142 | zvol_strategy(buf_t *bp) | |
1143 | { | |
1144 | zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); | |
1145 | uint64_t off, volsize; | |
b128c09f | 1146 | size_t resid; |
34dc7c2f BB |
1147 | char *addr; |
1148 | objset_t *os; | |
1149 | rl_t *rl; | |
1150 | int error = 0; | |
b128c09f BB |
1151 | boolean_t doread = bp->b_flags & B_READ; |
1152 | boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED; | |
9babb374 | 1153 | boolean_t sync; |
34dc7c2f BB |
1154 | |
1155 | if (zv == NULL) { | |
1156 | bioerror(bp, ENXIO); | |
1157 | biodone(bp); | |
1158 | return (0); | |
1159 | } | |
1160 | ||
1161 | if (getminor(bp->b_edev) == 0) { | |
1162 | bioerror(bp, EINVAL); | |
1163 | biodone(bp); | |
1164 | return (0); | |
1165 | } | |
1166 | ||
1167 | if (!(bp->b_flags & B_READ) && | |
1168 | (zv->zv_flags & ZVOL_RDONLY || | |
1169 | zv->zv_mode & DS_MODE_READONLY)) { | |
1170 | bioerror(bp, EROFS); | |
1171 | biodone(bp); | |
1172 | return (0); | |
1173 | } | |
1174 | ||
1175 | off = ldbtob(bp->b_blkno); | |
1176 | volsize = zv->zv_volsize; | |
1177 | ||
1178 | os = zv->zv_objset; | |
1179 | ASSERT(os != NULL); | |
1180 | ||
1181 | bp_mapin(bp); | |
1182 | addr = bp->b_un.b_addr; | |
1183 | resid = bp->b_bcount; | |
1184 | ||
b128c09f BB |
1185 | if (resid > 0 && (off < 0 || off >= volsize)) { |
1186 | bioerror(bp, EIO); | |
1187 | biodone(bp); | |
1188 | return (0); | |
1189 | } | |
1190 | ||
9babb374 BB |
1191 | sync = !(bp->b_flags & B_ASYNC) && !doread && !is_dump && |
1192 | !(zv->zv_flags & ZVOL_WCE) && !zil_disable; | |
1193 | ||
34dc7c2f BB |
1194 | /* |
1195 | * There must be no buffer changes when doing a dmu_sync() because | |
1196 | * we can't change the data whilst calculating the checksum. | |
1197 | */ | |
34dc7c2f | 1198 | rl = zfs_range_lock(&zv->zv_znode, off, resid, |
b128c09f | 1199 | doread ? RL_READER : RL_WRITER); |
34dc7c2f BB |
1200 | |
1201 | while (resid != 0 && off < volsize) { | |
b128c09f | 1202 | size_t size = MIN(resid, zvol_maxphys); |
34dc7c2f | 1203 | if (is_dump) { |
34dc7c2f | 1204 | size = MIN(size, P2END(off, zv->zv_volblocksize) - off); |
b128c09f BB |
1205 | error = zvol_dumpio(zv, addr, off, size, |
1206 | doread, B_FALSE); | |
1207 | } else if (doread) { | |
9babb374 BB |
1208 | error = dmu_read(os, ZVOL_OBJ, off, size, addr, |
1209 | DMU_READ_PREFETCH); | |
34dc7c2f BB |
1210 | } else { |
1211 | dmu_tx_t *tx = dmu_tx_create(os); | |
1212 | dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); | |
1213 | error = dmu_tx_assign(tx, TXG_WAIT); | |
1214 | if (error) { | |
1215 | dmu_tx_abort(tx); | |
1216 | } else { | |
1217 | dmu_write(os, ZVOL_OBJ, off, size, addr, tx); | |
9babb374 | 1218 | zvol_log_write(zv, tx, off, size, sync); |
34dc7c2f BB |
1219 | dmu_tx_commit(tx); |
1220 | } | |
1221 | } | |
b128c09f BB |
1222 | if (error) { |
1223 | /* convert checksum errors into IO errors */ | |
1224 | if (error == ECKSUM) | |
1225 | error = EIO; | |
34dc7c2f | 1226 | break; |
b128c09f | 1227 | } |
34dc7c2f BB |
1228 | off += size; |
1229 | addr += size; | |
1230 | resid -= size; | |
1231 | } | |
1232 | zfs_range_unlock(rl); | |
1233 | ||
1234 | if ((bp->b_resid = resid) == bp->b_bcount) | |
1235 | bioerror(bp, off > volsize ? EINVAL : error); | |
1236 | ||
9babb374 | 1237 | if (sync) |
34dc7c2f BB |
1238 | zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); |
1239 | biodone(bp); | |
1240 | ||
1241 | return (0); | |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | * Set the buffer count to the zvol maximum transfer. | |
1246 | * Using our own routine instead of the default minphys() | |
1247 | * means that for larger writes we write bigger buffers on X86 | |
1248 | * (128K instead of 56K) and flush the disk write cache less often | |
1249 | * (every zvol_maxphys - currently 1MB) instead of minphys (currently | |
1250 | * 56K on X86 and 128K on sparc). | |
1251 | */ | |
1252 | void | |
1253 | zvol_minphys(struct buf *bp) | |
1254 | { | |
1255 | if (bp->b_bcount > zvol_maxphys) | |
1256 | bp->b_bcount = zvol_maxphys; | |
1257 | } | |
1258 | ||
1259 | int | |
1260 | zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) | |
1261 | { | |
1262 | minor_t minor = getminor(dev); | |
1263 | zvol_state_t *zv; | |
1264 | int error = 0; | |
1265 | uint64_t size; | |
1266 | uint64_t boff; | |
1267 | uint64_t resid; | |
1268 | ||
1269 | if (minor == 0) /* This is the control device */ | |
1270 | return (ENXIO); | |
1271 | ||
1272 | zv = ddi_get_soft_state(zvol_state, minor); | |
1273 | if (zv == NULL) | |
1274 | return (ENXIO); | |
1275 | ||
1276 | boff = ldbtob(blkno); | |
1277 | resid = ldbtob(nblocks); | |
b128c09f BB |
1278 | |
1279 | VERIFY3U(boff + resid, <=, zv->zv_volsize); | |
1280 | ||
34dc7c2f | 1281 | while (resid) { |
34dc7c2f | 1282 | size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); |
b128c09f | 1283 | error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); |
34dc7c2f BB |
1284 | if (error) |
1285 | break; | |
1286 | boff += size; | |
1287 | addr += size; | |
1288 | resid -= size; | |
1289 | } | |
1290 | ||
1291 | return (error); | |
1292 | } | |
1293 | ||
1294 | /*ARGSUSED*/ | |
1295 | int | |
1296 | zvol_read(dev_t dev, uio_t *uio, cred_t *cr) | |
1297 | { | |
1298 | minor_t minor = getminor(dev); | |
1299 | zvol_state_t *zv; | |
b128c09f | 1300 | uint64_t volsize; |
34dc7c2f BB |
1301 | rl_t *rl; |
1302 | int error = 0; | |
1303 | ||
1304 | if (minor == 0) /* This is the control device */ | |
1305 | return (ENXIO); | |
1306 | ||
1307 | zv = ddi_get_soft_state(zvol_state, minor); | |
1308 | if (zv == NULL) | |
1309 | return (ENXIO); | |
1310 | ||
b128c09f BB |
1311 | volsize = zv->zv_volsize; |
1312 | if (uio->uio_resid > 0 && | |
1313 | (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) | |
1314 | return (EIO); | |
1315 | ||
1316 | if (zv->zv_flags & ZVOL_DUMPIFIED) { | |
1317 | error = physio(zvol_strategy, NULL, dev, B_READ, | |
1318 | zvol_minphys, uio); | |
1319 | return (error); | |
1320 | } | |
1321 | ||
34dc7c2f BB |
1322 | rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, |
1323 | RL_READER); | |
b128c09f | 1324 | while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { |
34dc7c2f BB |
1325 | uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); |
1326 | ||
b128c09f BB |
1327 | /* don't read past the end */ |
1328 | if (bytes > volsize - uio->uio_loffset) | |
1329 | bytes = volsize - uio->uio_loffset; | |
1330 | ||
34dc7c2f | 1331 | error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); |
b128c09f BB |
1332 | if (error) { |
1333 | /* convert checksum errors into IO errors */ | |
1334 | if (error == ECKSUM) | |
1335 | error = EIO; | |
34dc7c2f | 1336 | break; |
b128c09f | 1337 | } |
34dc7c2f BB |
1338 | } |
1339 | zfs_range_unlock(rl); | |
1340 | return (error); | |
1341 | } | |
1342 | ||
1343 | /*ARGSUSED*/ | |
1344 | int | |
1345 | zvol_write(dev_t dev, uio_t *uio, cred_t *cr) | |
1346 | { | |
1347 | minor_t minor = getminor(dev); | |
1348 | zvol_state_t *zv; | |
b128c09f | 1349 | uint64_t volsize; |
34dc7c2f BB |
1350 | rl_t *rl; |
1351 | int error = 0; | |
9babb374 | 1352 | boolean_t sync; |
34dc7c2f BB |
1353 | |
1354 | if (minor == 0) /* This is the control device */ | |
1355 | return (ENXIO); | |
1356 | ||
1357 | zv = ddi_get_soft_state(zvol_state, minor); | |
1358 | if (zv == NULL) | |
1359 | return (ENXIO); | |
1360 | ||
b128c09f BB |
1361 | volsize = zv->zv_volsize; |
1362 | if (uio->uio_resid > 0 && | |
1363 | (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) | |
1364 | return (EIO); | |
1365 | ||
34dc7c2f BB |
1366 | if (zv->zv_flags & ZVOL_DUMPIFIED) { |
1367 | error = physio(zvol_strategy, NULL, dev, B_WRITE, | |
1368 | zvol_minphys, uio); | |
1369 | return (error); | |
1370 | } | |
1371 | ||
9babb374 BB |
1372 | sync = !(zv->zv_flags & ZVOL_WCE) && !zil_disable; |
1373 | ||
34dc7c2f BB |
1374 | rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, |
1375 | RL_WRITER); | |
b128c09f | 1376 | while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { |
34dc7c2f BB |
1377 | uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); |
1378 | uint64_t off = uio->uio_loffset; | |
34dc7c2f | 1379 | dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); |
b128c09f BB |
1380 | |
1381 | if (bytes > volsize - off) /* don't write past the end */ | |
1382 | bytes = volsize - off; | |
1383 | ||
34dc7c2f BB |
1384 | dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); |
1385 | error = dmu_tx_assign(tx, TXG_WAIT); | |
1386 | if (error) { | |
1387 | dmu_tx_abort(tx); | |
1388 | break; | |
1389 | } | |
1390 | error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx); | |
1391 | if (error == 0) | |
9babb374 | 1392 | zvol_log_write(zv, tx, off, bytes, sync); |
34dc7c2f BB |
1393 | dmu_tx_commit(tx); |
1394 | ||
1395 | if (error) | |
1396 | break; | |
1397 | } | |
1398 | zfs_range_unlock(rl); | |
9babb374 | 1399 | if (sync) |
d164b209 | 1400 | zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); |
34dc7c2f BB |
1401 | return (error); |
1402 | } | |
1403 | ||
b128c09f BB |
1404 | int |
1405 | zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) | |
1406 | { | |
1407 | struct uuid uuid = EFI_RESERVED; | |
1408 | efi_gpe_t gpe = { 0 }; | |
1409 | uint32_t crc; | |
1410 | dk_efi_t efi; | |
1411 | int length; | |
1412 | char *ptr; | |
1413 | ||
1414 | if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) | |
1415 | return (EFAULT); | |
1416 | ptr = (char *)(uintptr_t)efi.dki_data_64; | |
1417 | length = efi.dki_length; | |
1418 | /* | |
1419 | * Some clients may attempt to request a PMBR for the | |
1420 | * zvol. Currently this interface will return EINVAL to | |
1421 | * such requests. These requests could be supported by | |
1422 | * adding a check for lba == 0 and consing up an appropriate | |
1423 | * PMBR. | |
1424 | */ | |
1425 | if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) | |
1426 | return (EINVAL); | |
1427 | ||
1428 | gpe.efi_gpe_StartingLBA = LE_64(34ULL); | |
1429 | gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); | |
1430 | UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); | |
1431 | ||
1432 | if (efi.dki_lba == 1) { | |
1433 | efi_gpt_t gpt = { 0 }; | |
1434 | ||
1435 | gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); | |
1436 | gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); | |
1437 | gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); | |
1438 | gpt.efi_gpt_MyLBA = LE_64(1ULL); | |
1439 | gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); | |
1440 | gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); | |
1441 | gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); | |
1442 | gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); | |
1443 | gpt.efi_gpt_SizeOfPartitionEntry = | |
1444 | LE_32(sizeof (efi_gpe_t)); | |
1445 | CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); | |
1446 | gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); | |
1447 | CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); | |
1448 | gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); | |
1449 | if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), | |
1450 | flag)) | |
1451 | return (EFAULT); | |
1452 | ptr += sizeof (gpt); | |
1453 | length -= sizeof (gpt); | |
1454 | } | |
1455 | if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), | |
1456 | length), flag)) | |
1457 | return (EFAULT); | |
1458 | return (0); | |
1459 | } | |
1460 | ||
34dc7c2f BB |
1461 | /* |
1462 | * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). | |
1463 | */ | |
1464 | /*ARGSUSED*/ | |
1465 | int | |
1466 | zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) | |
1467 | { | |
1468 | zvol_state_t *zv; | |
1469 | struct dk_cinfo dki; | |
1470 | struct dk_minfo dkm; | |
34dc7c2f | 1471 | struct dk_callback *dkc; |
34dc7c2f BB |
1472 | int error = 0; |
1473 | rl_t *rl; | |
1474 | ||
1475 | mutex_enter(&zvol_state_lock); | |
1476 | ||
1477 | zv = ddi_get_soft_state(zvol_state, getminor(dev)); | |
1478 | ||
1479 | if (zv == NULL) { | |
1480 | mutex_exit(&zvol_state_lock); | |
1481 | return (ENXIO); | |
1482 | } | |
9babb374 | 1483 | ASSERT(zv->zv_total_opens > 0); |
34dc7c2f BB |
1484 | |
1485 | switch (cmd) { | |
1486 | ||
1487 | case DKIOCINFO: | |
1488 | bzero(&dki, sizeof (dki)); | |
1489 | (void) strcpy(dki.dki_cname, "zvol"); | |
1490 | (void) strcpy(dki.dki_dname, "zvol"); | |
1491 | dki.dki_ctype = DKC_UNKNOWN; | |
1492 | dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); | |
1493 | mutex_exit(&zvol_state_lock); | |
1494 | if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) | |
1495 | error = EFAULT; | |
1496 | return (error); | |
1497 | ||
1498 | case DKIOCGMEDIAINFO: | |
1499 | bzero(&dkm, sizeof (dkm)); | |
1500 | dkm.dki_lbsize = 1U << zv->zv_min_bs; | |
1501 | dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; | |
1502 | dkm.dki_media_type = DK_UNKNOWN; | |
1503 | mutex_exit(&zvol_state_lock); | |
1504 | if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) | |
1505 | error = EFAULT; | |
1506 | return (error); | |
1507 | ||
1508 | case DKIOCGETEFI: | |
b128c09f BB |
1509 | { |
1510 | uint64_t vs = zv->zv_volsize; | |
1511 | uint8_t bs = zv->zv_min_bs; | |
34dc7c2f BB |
1512 | |
1513 | mutex_exit(&zvol_state_lock); | |
b128c09f BB |
1514 | error = zvol_getefi((void *)arg, flag, vs, bs); |
1515 | return (error); | |
34dc7c2f | 1516 | } |
34dc7c2f BB |
1517 | |
1518 | case DKIOCFLUSHWRITECACHE: | |
1519 | dkc = (struct dk_callback *)arg; | |
9babb374 | 1520 | mutex_exit(&zvol_state_lock); |
34dc7c2f BB |
1521 | zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); |
1522 | if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { | |
1523 | (*dkc->dkc_callback)(dkc->dkc_cookie, error); | |
1524 | error = 0; | |
1525 | } | |
9babb374 BB |
1526 | return (error); |
1527 | ||
1528 | case DKIOCGETWCE: | |
1529 | { | |
1530 | int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; | |
1531 | if (ddi_copyout(&wce, (void *)arg, sizeof (int), | |
1532 | flag)) | |
1533 | error = EFAULT; | |
1534 | break; | |
1535 | } | |
1536 | case DKIOCSETWCE: | |
1537 | { | |
1538 | int wce; | |
1539 | if (ddi_copyin((void *)arg, &wce, sizeof (int), | |
1540 | flag)) { | |
1541 | error = EFAULT; | |
1542 | break; | |
1543 | } | |
1544 | if (wce) { | |
1545 | zv->zv_flags |= ZVOL_WCE; | |
1546 | mutex_exit(&zvol_state_lock); | |
1547 | } else { | |
1548 | zv->zv_flags &= ~ZVOL_WCE; | |
1549 | mutex_exit(&zvol_state_lock); | |
1550 | zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); | |
1551 | } | |
1552 | return (0); | |
1553 | } | |
34dc7c2f BB |
1554 | |
1555 | case DKIOCGGEOM: | |
1556 | case DKIOCGVTOC: | |
1557 | /* | |
1558 | * commands using these (like prtvtoc) expect ENOTSUP | |
1559 | * since we're emulating an EFI label | |
1560 | */ | |
1561 | error = ENOTSUP; | |
1562 | break; | |
1563 | ||
1564 | case DKIOCDUMPINIT: | |
1565 | rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, | |
1566 | RL_WRITER); | |
1567 | error = zvol_dumpify(zv); | |
1568 | zfs_range_unlock(rl); | |
1569 | break; | |
1570 | ||
1571 | case DKIOCDUMPFINI: | |
9babb374 BB |
1572 | if (!(zv->zv_flags & ZVOL_DUMPIFIED)) |
1573 | break; | |
34dc7c2f BB |
1574 | rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, |
1575 | RL_WRITER); | |
1576 | error = zvol_dump_fini(zv); | |
1577 | zfs_range_unlock(rl); | |
1578 | break; | |
1579 | ||
1580 | default: | |
1581 | error = ENOTTY; | |
1582 | break; | |
1583 | ||
1584 | } | |
1585 | mutex_exit(&zvol_state_lock); | |
1586 | return (error); | |
1587 | } | |
1588 | ||
1589 | int | |
1590 | zvol_busy(void) | |
1591 | { | |
1592 | return (zvol_minors != 0); | |
1593 | } | |
1594 | ||
1595 | void | |
1596 | zvol_init(void) | |
1597 | { | |
1598 | VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); | |
1599 | mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); | |
1600 | } | |
1601 | ||
1602 | void | |
1603 | zvol_fini(void) | |
1604 | { | |
1605 | mutex_destroy(&zvol_state_lock); | |
1606 | ddi_soft_state_fini(&zvol_state); | |
1607 | } | |
1608 | ||
1609 | static boolean_t | |
1610 | zvol_is_swap(zvol_state_t *zv) | |
1611 | { | |
1612 | vnode_t *vp; | |
1613 | boolean_t ret = B_FALSE; | |
1614 | char *devpath; | |
1615 | size_t devpathlen; | |
1616 | int error; | |
1617 | ||
1618 | devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(zv->zv_name) + 1; | |
1619 | devpath = kmem_alloc(devpathlen, KM_SLEEP); | |
1620 | (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, zv->zv_name); | |
1621 | error = lookupname(devpath, UIO_SYSSPACE, FOLLOW, NULLVPP, &vp); | |
1622 | kmem_free(devpath, devpathlen); | |
1623 | ||
1624 | ret = !error && IS_SWAPVP(common_specvp(vp)); | |
1625 | ||
1626 | if (vp != NULL) | |
1627 | VN_RELE(vp); | |
1628 | ||
1629 | return (ret); | |
1630 | } | |
1631 | ||
1632 | static int | |
1633 | zvol_dump_init(zvol_state_t *zv, boolean_t resize) | |
1634 | { | |
1635 | dmu_tx_t *tx; | |
1636 | int error = 0; | |
1637 | objset_t *os = zv->zv_objset; | |
1638 | nvlist_t *nv = NULL; | |
34dc7c2f BB |
1639 | |
1640 | ASSERT(MUTEX_HELD(&zvol_state_lock)); | |
1641 | ||
1642 | tx = dmu_tx_create(os); | |
34dc7c2f BB |
1643 | dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); |
1644 | error = dmu_tx_assign(tx, TXG_WAIT); | |
1645 | if (error) { | |
1646 | dmu_tx_abort(tx); | |
1647 | return (error); | |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * If we are resizing the dump device then we only need to | |
1652 | * update the refreservation to match the newly updated | |
1653 | * zvolsize. Otherwise, we save off the original state of the | |
1654 | * zvol so that we can restore them if the zvol is ever undumpified. | |
1655 | */ | |
1656 | if (resize) { | |
1657 | error = zap_update(os, ZVOL_ZAP_OBJ, | |
1658 | zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, | |
1659 | &zv->zv_volsize, tx); | |
1660 | } else { | |
b128c09f BB |
1661 | uint64_t checksum, compress, refresrv, vbs; |
1662 | ||
34dc7c2f BB |
1663 | error = dsl_prop_get_integer(zv->zv_name, |
1664 | zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); | |
1665 | error = error ? error : dsl_prop_get_integer(zv->zv_name, | |
1666 | zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL); | |
1667 | error = error ? error : dsl_prop_get_integer(zv->zv_name, | |
1668 | zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL); | |
b128c09f BB |
1669 | error = error ? error : dsl_prop_get_integer(zv->zv_name, |
1670 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL); | |
34dc7c2f BB |
1671 | |
1672 | error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, | |
1673 | zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, | |
1674 | &compress, tx); | |
1675 | error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, | |
1676 | zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx); | |
1677 | error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, | |
1678 | zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, | |
1679 | &refresrv, tx); | |
b128c09f BB |
1680 | error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, |
1681 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, | |
1682 | &vbs, tx); | |
34dc7c2f BB |
1683 | } |
1684 | dmu_tx_commit(tx); | |
1685 | ||
1686 | /* Truncate the file */ | |
1687 | if (!error) | |
b128c09f BB |
1688 | error = dmu_free_long_range(zv->zv_objset, |
1689 | ZVOL_OBJ, 0, DMU_OBJECT_END); | |
34dc7c2f BB |
1690 | |
1691 | if (error) | |
1692 | return (error); | |
1693 | ||
1694 | /* | |
1695 | * We only need update the zvol's property if we are initializing | |
1696 | * the dump area for the first time. | |
1697 | */ | |
1698 | if (!resize) { | |
1699 | VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); | |
1700 | VERIFY(nvlist_add_uint64(nv, | |
1701 | zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); | |
1702 | VERIFY(nvlist_add_uint64(nv, | |
1703 | zfs_prop_to_name(ZFS_PROP_COMPRESSION), | |
1704 | ZIO_COMPRESS_OFF) == 0); | |
1705 | VERIFY(nvlist_add_uint64(nv, | |
1706 | zfs_prop_to_name(ZFS_PROP_CHECKSUM), | |
1707 | ZIO_CHECKSUM_OFF) == 0); | |
b128c09f BB |
1708 | VERIFY(nvlist_add_uint64(nv, |
1709 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), | |
1710 | SPA_MAXBLOCKSIZE) == 0); | |
34dc7c2f BB |
1711 | |
1712 | error = zfs_set_prop_nvlist(zv->zv_name, nv); | |
1713 | nvlist_free(nv); | |
1714 | ||
1715 | if (error) | |
1716 | return (error); | |
1717 | } | |
1718 | ||
1719 | /* Allocate the space for the dump */ | |
1720 | error = zvol_prealloc(zv); | |
1721 | return (error); | |
1722 | } | |
1723 | ||
1724 | static int | |
1725 | zvol_dumpify(zvol_state_t *zv) | |
1726 | { | |
1727 | int error = 0; | |
1728 | uint64_t dumpsize = 0; | |
1729 | dmu_tx_t *tx; | |
1730 | objset_t *os = zv->zv_objset; | |
1731 | ||
1732 | if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) | |
1733 | return (EROFS); | |
1734 | ||
1735 | /* | |
1736 | * We do not support swap devices acting as dump devices. | |
1737 | */ | |
1738 | if (zvol_is_swap(zv)) | |
1739 | return (ENOTSUP); | |
1740 | ||
1741 | if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, | |
1742 | 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { | |
1743 | boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE; | |
1744 | ||
1745 | if ((error = zvol_dump_init(zv, resize)) != 0) { | |
1746 | (void) zvol_dump_fini(zv); | |
1747 | return (error); | |
1748 | } | |
1749 | } | |
1750 | ||
1751 | /* | |
1752 | * Build up our lba mapping. | |
1753 | */ | |
1754 | error = zvol_get_lbas(zv); | |
1755 | if (error) { | |
1756 | (void) zvol_dump_fini(zv); | |
1757 | return (error); | |
1758 | } | |
1759 | ||
1760 | tx = dmu_tx_create(os); | |
1761 | dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); | |
1762 | error = dmu_tx_assign(tx, TXG_WAIT); | |
1763 | if (error) { | |
1764 | dmu_tx_abort(tx); | |
1765 | (void) zvol_dump_fini(zv); | |
1766 | return (error); | |
1767 | } | |
1768 | ||
1769 | zv->zv_flags |= ZVOL_DUMPIFIED; | |
1770 | error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, | |
1771 | &zv->zv_volsize, tx); | |
1772 | dmu_tx_commit(tx); | |
1773 | ||
1774 | if (error) { | |
1775 | (void) zvol_dump_fini(zv); | |
1776 | return (error); | |
1777 | } | |
1778 | ||
1779 | txg_wait_synced(dmu_objset_pool(os), 0); | |
1780 | return (0); | |
1781 | } | |
1782 | ||
1783 | static int | |
1784 | zvol_dump_fini(zvol_state_t *zv) | |
1785 | { | |
1786 | dmu_tx_t *tx; | |
1787 | objset_t *os = zv->zv_objset; | |
1788 | nvlist_t *nv; | |
1789 | int error = 0; | |
b128c09f BB |
1790 | uint64_t checksum, compress, refresrv, vbs; |
1791 | ||
1792 | /* | |
1793 | * Attempt to restore the zvol back to its pre-dumpified state. | |
1794 | * This is a best-effort attempt as it's possible that not all | |
1795 | * of these properties were initialized during the dumpify process | |
1796 | * (i.e. error during zvol_dump_init). | |
1797 | */ | |
34dc7c2f BB |
1798 | |
1799 | tx = dmu_tx_create(os); | |
1800 | dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); | |
1801 | error = dmu_tx_assign(tx, TXG_WAIT); | |
1802 | if (error) { | |
1803 | dmu_tx_abort(tx); | |
1804 | return (error); | |
1805 | } | |
b128c09f BB |
1806 | (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); |
1807 | dmu_tx_commit(tx); | |
34dc7c2f | 1808 | |
34dc7c2f BB |
1809 | (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, |
1810 | zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); | |
1811 | (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, | |
1812 | zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); | |
1813 | (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, | |
1814 | zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); | |
b128c09f BB |
1815 | (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, |
1816 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); | |
34dc7c2f BB |
1817 | |
1818 | VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); | |
1819 | (void) nvlist_add_uint64(nv, | |
1820 | zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); | |
1821 | (void) nvlist_add_uint64(nv, | |
1822 | zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); | |
1823 | (void) nvlist_add_uint64(nv, | |
1824 | zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); | |
b128c09f BB |
1825 | (void) nvlist_add_uint64(nv, |
1826 | zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), vbs); | |
34dc7c2f BB |
1827 | (void) zfs_set_prop_nvlist(zv->zv_name, nv); |
1828 | nvlist_free(nv); | |
1829 | ||
b128c09f BB |
1830 | zvol_free_extents(zv); |
1831 | zv->zv_flags &= ~ZVOL_DUMPIFIED; | |
1832 | (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); | |
1833 | ||
34dc7c2f BB |
1834 | return (0); |
1835 | } |