Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. | |
2b06cfff | 3 | * Copyright (C) 2004 - 2006 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
8 | #include "dm.h" | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/vmalloc.h> | |
12 | #include <linux/miscdevice.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/slab.h> | |
1da177e4 | 16 | #include <linux/dm-ioctl.h> |
3ac51e74 | 17 | #include <linux/hdreg.h> |
76c072b4 | 18 | #include <linux/compat.h> |
1da177e4 LT |
19 | |
20 | #include <asm/uaccess.h> | |
21 | ||
72d94861 | 22 | #define DM_MSG_PREFIX "ioctl" |
1da177e4 LT |
23 | #define DM_DRIVER_EMAIL "dm-devel@redhat.com" |
24 | ||
25 | /*----------------------------------------------------------------- | |
26 | * The ioctl interface needs to be able to look up devices by | |
27 | * name or uuid. | |
28 | *---------------------------------------------------------------*/ | |
29 | struct hash_cell { | |
30 | struct list_head name_list; | |
31 | struct list_head uuid_list; | |
32 | ||
33 | char *name; | |
34 | char *uuid; | |
35 | struct mapped_device *md; | |
36 | struct dm_table *new_map; | |
37 | }; | |
38 | ||
39 | struct vers_iter { | |
40 | size_t param_size; | |
41 | struct dm_target_versions *vers, *old_vers; | |
42 | char *end; | |
43 | uint32_t flags; | |
44 | }; | |
45 | ||
46 | ||
47 | #define NUM_BUCKETS 64 | |
48 | #define MASK_BUCKETS (NUM_BUCKETS - 1) | |
49 | static struct list_head _name_buckets[NUM_BUCKETS]; | |
50 | static struct list_head _uuid_buckets[NUM_BUCKETS]; | |
51 | ||
5c6bd75d | 52 | static void dm_hash_remove_all(int keep_open_devices); |
1da177e4 LT |
53 | |
54 | /* | |
55 | * Guards access to both hash tables. | |
56 | */ | |
57 | static DECLARE_RWSEM(_hash_lock); | |
58 | ||
6076905b MP |
59 | /* |
60 | * Protects use of mdptr to obtain hash cell name and uuid from mapped device. | |
61 | */ | |
62 | static DEFINE_MUTEX(dm_hash_cells_mutex); | |
63 | ||
1da177e4 LT |
64 | static void init_buckets(struct list_head *buckets) |
65 | { | |
66 | unsigned int i; | |
67 | ||
68 | for (i = 0; i < NUM_BUCKETS; i++) | |
69 | INIT_LIST_HEAD(buckets + i); | |
70 | } | |
71 | ||
72 | static int dm_hash_init(void) | |
73 | { | |
74 | init_buckets(_name_buckets); | |
75 | init_buckets(_uuid_buckets); | |
1da177e4 LT |
76 | return 0; |
77 | } | |
78 | ||
79 | static void dm_hash_exit(void) | |
80 | { | |
5c6bd75d | 81 | dm_hash_remove_all(0); |
1da177e4 LT |
82 | } |
83 | ||
84 | /*----------------------------------------------------------------- | |
85 | * Hash function: | |
86 | * We're not really concerned with the str hash function being | |
87 | * fast since it's only used by the ioctl interface. | |
88 | *---------------------------------------------------------------*/ | |
89 | static unsigned int hash_str(const char *str) | |
90 | { | |
91 | const unsigned int hash_mult = 2654435387U; | |
92 | unsigned int h = 0; | |
93 | ||
94 | while (*str) | |
95 | h = (h + (unsigned int) *str++) * hash_mult; | |
96 | ||
97 | return h & MASK_BUCKETS; | |
98 | } | |
99 | ||
100 | /*----------------------------------------------------------------- | |
101 | * Code for looking up a device by name | |
102 | *---------------------------------------------------------------*/ | |
103 | static struct hash_cell *__get_name_cell(const char *str) | |
104 | { | |
105 | struct hash_cell *hc; | |
106 | unsigned int h = hash_str(str); | |
107 | ||
108 | list_for_each_entry (hc, _name_buckets + h, name_list) | |
7ec75f25 JM |
109 | if (!strcmp(hc->name, str)) { |
110 | dm_get(hc->md); | |
1da177e4 | 111 | return hc; |
7ec75f25 | 112 | } |
1da177e4 LT |
113 | |
114 | return NULL; | |
115 | } | |
116 | ||
117 | static struct hash_cell *__get_uuid_cell(const char *str) | |
118 | { | |
119 | struct hash_cell *hc; | |
120 | unsigned int h = hash_str(str); | |
121 | ||
122 | list_for_each_entry (hc, _uuid_buckets + h, uuid_list) | |
7ec75f25 JM |
123 | if (!strcmp(hc->uuid, str)) { |
124 | dm_get(hc->md); | |
1da177e4 | 125 | return hc; |
7ec75f25 | 126 | } |
1da177e4 LT |
127 | |
128 | return NULL; | |
129 | } | |
130 | ||
ba2e19b0 MP |
131 | static struct hash_cell *__get_dev_cell(uint64_t dev) |
132 | { | |
133 | struct mapped_device *md; | |
134 | struct hash_cell *hc; | |
135 | ||
136 | md = dm_get_md(huge_decode_dev(dev)); | |
137 | if (!md) | |
138 | return NULL; | |
139 | ||
140 | hc = dm_get_mdptr(md); | |
141 | if (!hc) { | |
142 | dm_put(md); | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | return hc; | |
147 | } | |
148 | ||
1da177e4 LT |
149 | /*----------------------------------------------------------------- |
150 | * Inserting, removing and renaming a device. | |
151 | *---------------------------------------------------------------*/ | |
1da177e4 LT |
152 | static struct hash_cell *alloc_cell(const char *name, const char *uuid, |
153 | struct mapped_device *md) | |
154 | { | |
155 | struct hash_cell *hc; | |
156 | ||
157 | hc = kmalloc(sizeof(*hc), GFP_KERNEL); | |
158 | if (!hc) | |
159 | return NULL; | |
160 | ||
543537bd | 161 | hc->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
162 | if (!hc->name) { |
163 | kfree(hc); | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | if (!uuid) | |
168 | hc->uuid = NULL; | |
169 | ||
170 | else { | |
543537bd | 171 | hc->uuid = kstrdup(uuid, GFP_KERNEL); |
1da177e4 LT |
172 | if (!hc->uuid) { |
173 | kfree(hc->name); | |
174 | kfree(hc); | |
175 | return NULL; | |
176 | } | |
177 | } | |
178 | ||
179 | INIT_LIST_HEAD(&hc->name_list); | |
180 | INIT_LIST_HEAD(&hc->uuid_list); | |
181 | hc->md = md; | |
182 | hc->new_map = NULL; | |
183 | return hc; | |
184 | } | |
185 | ||
186 | static void free_cell(struct hash_cell *hc) | |
187 | { | |
188 | if (hc) { | |
189 | kfree(hc->name); | |
190 | kfree(hc->uuid); | |
191 | kfree(hc); | |
192 | } | |
193 | } | |
194 | ||
1da177e4 LT |
195 | /* |
196 | * The kdev_t and uuid of a device can never change once it is | |
197 | * initially inserted. | |
198 | */ | |
199 | static int dm_hash_insert(const char *name, const char *uuid, struct mapped_device *md) | |
200 | { | |
7ec75f25 | 201 | struct hash_cell *cell, *hc; |
1da177e4 LT |
202 | |
203 | /* | |
204 | * Allocate the new cells. | |
205 | */ | |
206 | cell = alloc_cell(name, uuid, md); | |
207 | if (!cell) | |
208 | return -ENOMEM; | |
209 | ||
210 | /* | |
211 | * Insert the cell into both hash tables. | |
212 | */ | |
213 | down_write(&_hash_lock); | |
7ec75f25 JM |
214 | hc = __get_name_cell(name); |
215 | if (hc) { | |
216 | dm_put(hc->md); | |
1da177e4 | 217 | goto bad; |
7ec75f25 | 218 | } |
1da177e4 LT |
219 | |
220 | list_add(&cell->name_list, _name_buckets + hash_str(name)); | |
221 | ||
222 | if (uuid) { | |
7ec75f25 JM |
223 | hc = __get_uuid_cell(uuid); |
224 | if (hc) { | |
1da177e4 | 225 | list_del(&cell->name_list); |
7ec75f25 | 226 | dm_put(hc->md); |
1da177e4 LT |
227 | goto bad; |
228 | } | |
229 | list_add(&cell->uuid_list, _uuid_buckets + hash_str(uuid)); | |
230 | } | |
1da177e4 | 231 | dm_get(md); |
6076905b | 232 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 233 | dm_set_mdptr(md, cell); |
6076905b | 234 | mutex_unlock(&dm_hash_cells_mutex); |
1da177e4 LT |
235 | up_write(&_hash_lock); |
236 | ||
237 | return 0; | |
238 | ||
239 | bad: | |
240 | up_write(&_hash_lock); | |
241 | free_cell(cell); | |
242 | return -EBUSY; | |
243 | } | |
244 | ||
245 | static void __hash_remove(struct hash_cell *hc) | |
246 | { | |
269fd2a6 | 247 | struct dm_table *table; |
248 | ||
1da177e4 LT |
249 | /* remove from the dev hash */ |
250 | list_del(&hc->uuid_list); | |
251 | list_del(&hc->name_list); | |
6076905b | 252 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 253 | dm_set_mdptr(hc->md, NULL); |
6076905b | 254 | mutex_unlock(&dm_hash_cells_mutex); |
269fd2a6 | 255 | |
7c666411 | 256 | table = dm_get_live_table(hc->md); |
269fd2a6 | 257 | if (table) { |
258 | dm_table_event(table); | |
259 | dm_table_put(table); | |
260 | } | |
261 | ||
1da177e4 | 262 | if (hc->new_map) |
d5816876 | 263 | dm_table_destroy(hc->new_map); |
1134e5ae | 264 | dm_put(hc->md); |
1da177e4 LT |
265 | free_cell(hc); |
266 | } | |
267 | ||
5c6bd75d | 268 | static void dm_hash_remove_all(int keep_open_devices) |
1da177e4 | 269 | { |
98f33285 | 270 | int i, dev_skipped; |
1da177e4 | 271 | struct hash_cell *hc; |
98f33285 KU |
272 | struct mapped_device *md; |
273 | ||
274 | retry: | |
275 | dev_skipped = 0; | |
1da177e4 LT |
276 | |
277 | down_write(&_hash_lock); | |
5c6bd75d | 278 | |
1da177e4 | 279 | for (i = 0; i < NUM_BUCKETS; i++) { |
98f33285 KU |
280 | list_for_each_entry(hc, _name_buckets + i, name_list) { |
281 | md = hc->md; | |
282 | dm_get(md); | |
5c6bd75d | 283 | |
98f33285 KU |
284 | if (keep_open_devices && dm_lock_for_deletion(md)) { |
285 | dm_put(md); | |
5c6bd75d AK |
286 | dev_skipped++; |
287 | continue; | |
288 | } | |
98f33285 | 289 | |
1da177e4 | 290 | __hash_remove(hc); |
5c6bd75d | 291 | |
98f33285 | 292 | up_write(&_hash_lock); |
5c6bd75d | 293 | |
98f33285 | 294 | dm_put(md); |
3f77316d KU |
295 | if (likely(keep_open_devices)) |
296 | dm_destroy(md); | |
297 | else | |
298 | dm_destroy_immediate(md); | |
98f33285 KU |
299 | |
300 | /* | |
301 | * Some mapped devices may be using other mapped | |
302 | * devices, so repeat until we make no further | |
303 | * progress. If a new mapped device is created | |
304 | * here it will also get removed. | |
305 | */ | |
306 | goto retry; | |
307 | } | |
5c6bd75d AK |
308 | } |
309 | ||
1da177e4 | 310 | up_write(&_hash_lock); |
98f33285 KU |
311 | |
312 | if (dev_skipped) | |
313 | DMWARN("remove_all left %d open device(s)", dev_skipped); | |
1da177e4 LT |
314 | } |
315 | ||
84c89557 PJ |
316 | /* |
317 | * Set the uuid of a hash_cell that isn't already set. | |
318 | */ | |
319 | static void __set_cell_uuid(struct hash_cell *hc, char *new_uuid) | |
320 | { | |
321 | mutex_lock(&dm_hash_cells_mutex); | |
322 | hc->uuid = new_uuid; | |
323 | mutex_unlock(&dm_hash_cells_mutex); | |
324 | ||
325 | list_add(&hc->uuid_list, _uuid_buckets + hash_str(new_uuid)); | |
326 | } | |
327 | ||
328 | /* | |
329 | * Changes the name of a hash_cell and returns the old name for | |
330 | * the caller to free. | |
331 | */ | |
332 | static char *__change_cell_name(struct hash_cell *hc, char *new_name) | |
333 | { | |
334 | char *old_name; | |
335 | ||
336 | /* | |
337 | * Rename and move the name cell. | |
338 | */ | |
339 | list_del(&hc->name_list); | |
340 | old_name = hc->name; | |
341 | ||
342 | mutex_lock(&dm_hash_cells_mutex); | |
343 | hc->name = new_name; | |
344 | mutex_unlock(&dm_hash_cells_mutex); | |
345 | ||
346 | list_add(&hc->name_list, _name_buckets + hash_str(new_name)); | |
347 | ||
348 | return old_name; | |
349 | } | |
350 | ||
856a6f1d PR |
351 | static struct mapped_device *dm_hash_rename(struct dm_ioctl *param, |
352 | const char *new) | |
1da177e4 | 353 | { |
84c89557 | 354 | char *new_data, *old_name = NULL; |
1da177e4 | 355 | struct hash_cell *hc; |
81f1777a | 356 | struct dm_table *table; |
856a6f1d | 357 | struct mapped_device *md; |
84c89557 | 358 | unsigned change_uuid = (param->flags & DM_UUID_FLAG) ? 1 : 0; |
1da177e4 LT |
359 | |
360 | /* | |
361 | * duplicate new. | |
362 | */ | |
84c89557 PJ |
363 | new_data = kstrdup(new, GFP_KERNEL); |
364 | if (!new_data) | |
856a6f1d | 365 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
366 | |
367 | down_write(&_hash_lock); | |
368 | ||
369 | /* | |
370 | * Is new free ? | |
371 | */ | |
84c89557 PJ |
372 | if (change_uuid) |
373 | hc = __get_uuid_cell(new); | |
374 | else | |
375 | hc = __get_name_cell(new); | |
376 | ||
1da177e4 | 377 | if (hc) { |
84c89557 PJ |
378 | DMWARN("Unable to change %s on mapped device %s to one that " |
379 | "already exists: %s", | |
380 | change_uuid ? "uuid" : "name", | |
856a6f1d | 381 | param->name, new); |
7ec75f25 | 382 | dm_put(hc->md); |
1da177e4 | 383 | up_write(&_hash_lock); |
84c89557 | 384 | kfree(new_data); |
856a6f1d | 385 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
386 | } |
387 | ||
388 | /* | |
389 | * Is there such a device as 'old' ? | |
390 | */ | |
856a6f1d | 391 | hc = __get_name_cell(param->name); |
1da177e4 | 392 | if (!hc) { |
84c89557 PJ |
393 | DMWARN("Unable to rename non-existent device, %s to %s%s", |
394 | param->name, change_uuid ? "uuid " : "", new); | |
1da177e4 | 395 | up_write(&_hash_lock); |
84c89557 | 396 | kfree(new_data); |
856a6f1d | 397 | return ERR_PTR(-ENXIO); |
1da177e4 LT |
398 | } |
399 | ||
400 | /* | |
84c89557 | 401 | * Does this device already have a uuid? |
1da177e4 | 402 | */ |
84c89557 PJ |
403 | if (change_uuid && hc->uuid) { |
404 | DMWARN("Unable to change uuid of mapped device %s to %s " | |
405 | "because uuid is already set to %s", | |
406 | param->name, new, hc->uuid); | |
407 | dm_put(hc->md); | |
408 | up_write(&_hash_lock); | |
409 | kfree(new_data); | |
410 | return ERR_PTR(-EINVAL); | |
411 | } | |
412 | ||
413 | if (change_uuid) | |
414 | __set_cell_uuid(hc, new_data); | |
415 | else | |
416 | old_name = __change_cell_name(hc, new_data); | |
1da177e4 | 417 | |
81f1777a | 418 | /* |
419 | * Wake up any dm event waiters. | |
420 | */ | |
7c666411 | 421 | table = dm_get_live_table(hc->md); |
81f1777a | 422 | if (table) { |
423 | dm_table_event(table); | |
424 | dm_table_put(table); | |
425 | } | |
426 | ||
856a6f1d PR |
427 | if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, param->event_nr)) |
428 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
69267a30 | 429 | |
856a6f1d | 430 | md = hc->md; |
1da177e4 LT |
431 | up_write(&_hash_lock); |
432 | kfree(old_name); | |
856a6f1d PR |
433 | |
434 | return md; | |
1da177e4 LT |
435 | } |
436 | ||
437 | /*----------------------------------------------------------------- | |
438 | * Implementation of the ioctl commands | |
439 | *---------------------------------------------------------------*/ | |
440 | /* | |
441 | * All the ioctl commands get dispatched to functions with this | |
442 | * prototype. | |
443 | */ | |
444 | typedef int (*ioctl_fn)(struct dm_ioctl *param, size_t param_size); | |
445 | ||
446 | static int remove_all(struct dm_ioctl *param, size_t param_size) | |
447 | { | |
5c6bd75d | 448 | dm_hash_remove_all(1); |
1da177e4 LT |
449 | param->data_size = 0; |
450 | return 0; | |
451 | } | |
452 | ||
453 | /* | |
454 | * Round up the ptr to an 8-byte boundary. | |
455 | */ | |
456 | #define ALIGN_MASK 7 | |
457 | static inline void *align_ptr(void *ptr) | |
458 | { | |
459 | return (void *) (((size_t) (ptr + ALIGN_MASK)) & ~ALIGN_MASK); | |
460 | } | |
461 | ||
462 | /* | |
463 | * Retrieves the data payload buffer from an already allocated | |
464 | * struct dm_ioctl. | |
465 | */ | |
466 | static void *get_result_buffer(struct dm_ioctl *param, size_t param_size, | |
467 | size_t *len) | |
468 | { | |
469 | param->data_start = align_ptr(param + 1) - (void *) param; | |
470 | ||
471 | if (param->data_start < param_size) | |
472 | *len = param_size - param->data_start; | |
473 | else | |
474 | *len = 0; | |
475 | ||
476 | return ((void *) param) + param->data_start; | |
477 | } | |
478 | ||
479 | static int list_devices(struct dm_ioctl *param, size_t param_size) | |
480 | { | |
481 | unsigned int i; | |
482 | struct hash_cell *hc; | |
483 | size_t len, needed = 0; | |
484 | struct gendisk *disk; | |
485 | struct dm_name_list *nl, *old_nl = NULL; | |
486 | ||
487 | down_write(&_hash_lock); | |
488 | ||
489 | /* | |
490 | * Loop through all the devices working out how much | |
491 | * space we need. | |
492 | */ | |
493 | for (i = 0; i < NUM_BUCKETS; i++) { | |
494 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
495 | needed += sizeof(struct dm_name_list); | |
496 | needed += strlen(hc->name) + 1; | |
497 | needed += ALIGN_MASK; | |
498 | } | |
499 | } | |
500 | ||
501 | /* | |
502 | * Grab our output buffer. | |
503 | */ | |
504 | nl = get_result_buffer(param, param_size, &len); | |
505 | if (len < needed) { | |
506 | param->flags |= DM_BUFFER_FULL_FLAG; | |
507 | goto out; | |
508 | } | |
509 | param->data_size = param->data_start + needed; | |
510 | ||
511 | nl->dev = 0; /* Flags no data */ | |
512 | ||
513 | /* | |
514 | * Now loop through filling out the names. | |
515 | */ | |
516 | for (i = 0; i < NUM_BUCKETS; i++) { | |
517 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
518 | if (old_nl) | |
519 | old_nl->next = (uint32_t) ((void *) nl - | |
520 | (void *) old_nl); | |
521 | disk = dm_disk(hc->md); | |
f331c029 | 522 | nl->dev = huge_encode_dev(disk_devt(disk)); |
1da177e4 LT |
523 | nl->next = 0; |
524 | strcpy(nl->name, hc->name); | |
525 | ||
526 | old_nl = nl; | |
527 | nl = align_ptr(((void *) ++nl) + strlen(hc->name) + 1); | |
528 | } | |
529 | } | |
530 | ||
531 | out: | |
532 | up_write(&_hash_lock); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | static void list_version_get_needed(struct target_type *tt, void *needed_param) | |
537 | { | |
538 | size_t *needed = needed_param; | |
539 | ||
c4cc6635 | 540 | *needed += sizeof(struct dm_target_versions); |
1da177e4 | 541 | *needed += strlen(tt->name); |
1da177e4 LT |
542 | *needed += ALIGN_MASK; |
543 | } | |
544 | ||
545 | static void list_version_get_info(struct target_type *tt, void *param) | |
546 | { | |
547 | struct vers_iter *info = param; | |
548 | ||
549 | /* Check space - it might have changed since the first iteration */ | |
550 | if ((char *)info->vers + sizeof(tt->version) + strlen(tt->name) + 1 > | |
551 | info->end) { | |
552 | ||
553 | info->flags = DM_BUFFER_FULL_FLAG; | |
554 | return; | |
555 | } | |
556 | ||
557 | if (info->old_vers) | |
558 | info->old_vers->next = (uint32_t) ((void *)info->vers - | |
559 | (void *)info->old_vers); | |
560 | info->vers->version[0] = tt->version[0]; | |
561 | info->vers->version[1] = tt->version[1]; | |
562 | info->vers->version[2] = tt->version[2]; | |
563 | info->vers->next = 0; | |
564 | strcpy(info->vers->name, tt->name); | |
565 | ||
566 | info->old_vers = info->vers; | |
567 | info->vers = align_ptr(((void *) ++info->vers) + strlen(tt->name) + 1); | |
568 | } | |
569 | ||
570 | static int list_versions(struct dm_ioctl *param, size_t param_size) | |
571 | { | |
572 | size_t len, needed = 0; | |
573 | struct dm_target_versions *vers; | |
574 | struct vers_iter iter_info; | |
575 | ||
576 | /* | |
577 | * Loop through all the devices working out how much | |
578 | * space we need. | |
579 | */ | |
580 | dm_target_iterate(list_version_get_needed, &needed); | |
581 | ||
582 | /* | |
583 | * Grab our output buffer. | |
584 | */ | |
585 | vers = get_result_buffer(param, param_size, &len); | |
586 | if (len < needed) { | |
587 | param->flags |= DM_BUFFER_FULL_FLAG; | |
588 | goto out; | |
589 | } | |
590 | param->data_size = param->data_start + needed; | |
591 | ||
592 | iter_info.param_size = param_size; | |
593 | iter_info.old_vers = NULL; | |
594 | iter_info.vers = vers; | |
595 | iter_info.flags = 0; | |
596 | iter_info.end = (char *)vers+len; | |
597 | ||
598 | /* | |
599 | * Now loop through filling out the names & versions. | |
600 | */ | |
601 | dm_target_iterate(list_version_get_info, &iter_info); | |
602 | param->flags |= iter_info.flags; | |
603 | ||
604 | out: | |
605 | return 0; | |
606 | } | |
607 | ||
1da177e4 LT |
608 | static int check_name(const char *name) |
609 | { | |
610 | if (strchr(name, '/')) { | |
611 | DMWARN("invalid device name"); | |
612 | return -EINVAL; | |
613 | } | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
1d0f3ce8 MS |
618 | /* |
619 | * On successful return, the caller must not attempt to acquire | |
620 | * _hash_lock without first calling dm_table_put, because dm_table_destroy | |
621 | * waits for this dm_table_put and could be called under this lock. | |
622 | */ | |
623 | static struct dm_table *dm_get_inactive_table(struct mapped_device *md) | |
624 | { | |
625 | struct hash_cell *hc; | |
626 | struct dm_table *table = NULL; | |
627 | ||
628 | down_read(&_hash_lock); | |
629 | hc = dm_get_mdptr(md); | |
630 | if (!hc || hc->md != md) { | |
631 | DMWARN("device has been removed from the dev hash table."); | |
632 | goto out; | |
633 | } | |
634 | ||
635 | table = hc->new_map; | |
636 | if (table) | |
637 | dm_table_get(table); | |
638 | ||
639 | out: | |
640 | up_read(&_hash_lock); | |
641 | ||
642 | return table; | |
643 | } | |
644 | ||
645 | static struct dm_table *dm_get_live_or_inactive_table(struct mapped_device *md, | |
646 | struct dm_ioctl *param) | |
647 | { | |
648 | return (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) ? | |
649 | dm_get_inactive_table(md) : dm_get_live_table(md); | |
650 | } | |
651 | ||
1da177e4 LT |
652 | /* |
653 | * Fills in a dm_ioctl structure, ready for sending back to | |
654 | * userland. | |
655 | */ | |
094ea9a0 | 656 | static void __dev_status(struct mapped_device *md, struct dm_ioctl *param) |
1da177e4 LT |
657 | { |
658 | struct gendisk *disk = dm_disk(md); | |
659 | struct dm_table *table; | |
1da177e4 LT |
660 | |
661 | param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG | | |
662 | DM_ACTIVE_PRESENT_FLAG); | |
663 | ||
4f186f8b | 664 | if (dm_suspended_md(md)) |
1da177e4 LT |
665 | param->flags |= DM_SUSPEND_FLAG; |
666 | ||
f331c029 | 667 | param->dev = huge_encode_dev(disk_devt(disk)); |
1da177e4 | 668 | |
5c6bd75d AK |
669 | /* |
670 | * Yes, this will be out of date by the time it gets back | |
671 | * to userland, but it is still very useful for | |
672 | * debugging. | |
673 | */ | |
674 | param->open_count = dm_open_count(md); | |
1da177e4 | 675 | |
1da177e4 | 676 | param->event_nr = dm_get_event_nr(md); |
1d0f3ce8 | 677 | param->target_count = 0; |
1da177e4 | 678 | |
7c666411 | 679 | table = dm_get_live_table(md); |
1da177e4 | 680 | if (table) { |
1d0f3ce8 MS |
681 | if (!(param->flags & DM_QUERY_INACTIVE_TABLE_FLAG)) { |
682 | if (get_disk_ro(disk)) | |
683 | param->flags |= DM_READONLY_FLAG; | |
684 | param->target_count = dm_table_get_num_targets(table); | |
685 | } | |
1da177e4 | 686 | dm_table_put(table); |
1d0f3ce8 MS |
687 | |
688 | param->flags |= DM_ACTIVE_PRESENT_FLAG; | |
689 | } | |
690 | ||
691 | if (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) { | |
692 | table = dm_get_inactive_table(md); | |
693 | if (table) { | |
694 | if (!(dm_table_get_mode(table) & FMODE_WRITE)) | |
695 | param->flags |= DM_READONLY_FLAG; | |
696 | param->target_count = dm_table_get_num_targets(table); | |
697 | dm_table_put(table); | |
698 | } | |
699 | } | |
1da177e4 LT |
700 | } |
701 | ||
702 | static int dev_create(struct dm_ioctl *param, size_t param_size) | |
703 | { | |
2b06cfff | 704 | int r, m = DM_ANY_MINOR; |
1da177e4 LT |
705 | struct mapped_device *md; |
706 | ||
707 | r = check_name(param->name); | |
708 | if (r) | |
709 | return r; | |
710 | ||
711 | if (param->flags & DM_PERSISTENT_DEV_FLAG) | |
2b06cfff | 712 | m = MINOR(huge_decode_dev(param->dev)); |
1da177e4 | 713 | |
2b06cfff | 714 | r = dm_create(m, &md); |
1da177e4 LT |
715 | if (r) |
716 | return r; | |
717 | ||
718 | r = dm_hash_insert(param->name, *param->uuid ? param->uuid : NULL, md); | |
3f77316d KU |
719 | if (r) { |
720 | dm_put(md); | |
721 | dm_destroy(md); | |
722 | return r; | |
723 | } | |
1da177e4 LT |
724 | |
725 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
726 | ||
094ea9a0 AK |
727 | __dev_status(md, param); |
728 | ||
1da177e4 LT |
729 | dm_put(md); |
730 | ||
3f77316d | 731 | return 0; |
1da177e4 LT |
732 | } |
733 | ||
734 | /* | |
735 | * Always use UUID for lookups if it's present, otherwise use name or dev. | |
736 | */ | |
858119e1 | 737 | static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) |
1da177e4 | 738 | { |
0ddf9644 | 739 | struct hash_cell *hc = NULL; |
9ade92a9 | 740 | |
0ddf9644 | 741 | if (*param->uuid) { |
759dea20 MP |
742 | if (*param->name || param->dev) |
743 | return NULL; | |
744 | ||
0ddf9644 MP |
745 | hc = __get_uuid_cell(param->uuid); |
746 | if (!hc) | |
747 | return NULL; | |
ba2e19b0 | 748 | } else if (*param->name) { |
759dea20 MP |
749 | if (param->dev) |
750 | return NULL; | |
751 | ||
0ddf9644 MP |
752 | hc = __get_name_cell(param->name); |
753 | if (!hc) | |
754 | return NULL; | |
ba2e19b0 MP |
755 | } else if (param->dev) { |
756 | hc = __get_dev_cell(param->dev); | |
757 | if (!hc) | |
758 | return NULL; | |
759 | } else | |
0ddf9644 | 760 | return NULL; |
9ade92a9 | 761 | |
0ddf9644 MP |
762 | /* |
763 | * Sneakily write in both the name and the uuid | |
764 | * while we have the cell. | |
765 | */ | |
766 | strlcpy(param->name, hc->name, sizeof(param->name)); | |
767 | if (hc->uuid) | |
768 | strlcpy(param->uuid, hc->uuid, sizeof(param->uuid)); | |
769 | else | |
770 | param->uuid[0] = '\0'; | |
771 | ||
772 | if (hc->new_map) | |
773 | param->flags |= DM_INACTIVE_PRESENT_FLAG; | |
774 | else | |
775 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
776 | ||
777 | return hc; | |
1da177e4 LT |
778 | } |
779 | ||
858119e1 | 780 | static struct mapped_device *find_device(struct dm_ioctl *param) |
1da177e4 LT |
781 | { |
782 | struct hash_cell *hc; | |
783 | struct mapped_device *md = NULL; | |
784 | ||
785 | down_read(&_hash_lock); | |
786 | hc = __find_device_hash_cell(param); | |
0ddf9644 | 787 | if (hc) |
1da177e4 | 788 | md = hc->md; |
1da177e4 LT |
789 | up_read(&_hash_lock); |
790 | ||
791 | return md; | |
792 | } | |
793 | ||
794 | static int dev_remove(struct dm_ioctl *param, size_t param_size) | |
795 | { | |
796 | struct hash_cell *hc; | |
7ec75f25 | 797 | struct mapped_device *md; |
5c6bd75d | 798 | int r; |
1da177e4 LT |
799 | |
800 | down_write(&_hash_lock); | |
801 | hc = __find_device_hash_cell(param); | |
802 | ||
803 | if (!hc) { | |
810b4923 | 804 | DMDEBUG_LIMIT("device doesn't appear to be in the dev hash table."); |
1da177e4 LT |
805 | up_write(&_hash_lock); |
806 | return -ENXIO; | |
807 | } | |
808 | ||
7ec75f25 JM |
809 | md = hc->md; |
810 | ||
5c6bd75d AK |
811 | /* |
812 | * Ensure the device is not open and nothing further can open it. | |
813 | */ | |
814 | r = dm_lock_for_deletion(md); | |
815 | if (r) { | |
810b4923 | 816 | DMDEBUG_LIMIT("unable to remove open device %s", hc->name); |
5c6bd75d AK |
817 | up_write(&_hash_lock); |
818 | dm_put(md); | |
819 | return r; | |
820 | } | |
821 | ||
1da177e4 LT |
822 | __hash_remove(hc); |
823 | up_write(&_hash_lock); | |
60935eb2 | 824 | |
3abf85b5 PR |
825 | if (!dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr)) |
826 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
60935eb2 | 827 | |
7ec75f25 | 828 | dm_put(md); |
3f77316d | 829 | dm_destroy(md); |
1da177e4 LT |
830 | return 0; |
831 | } | |
832 | ||
833 | /* | |
834 | * Check a string doesn't overrun the chunk of | |
835 | * memory we copied from userland. | |
836 | */ | |
837 | static int invalid_str(char *str, void *end) | |
838 | { | |
839 | while ((void *) str < end) | |
840 | if (!*str++) | |
841 | return 0; | |
842 | ||
843 | return -EINVAL; | |
844 | } | |
845 | ||
846 | static int dev_rename(struct dm_ioctl *param, size_t param_size) | |
847 | { | |
848 | int r; | |
84c89557 | 849 | char *new_data = (char *) param + param->data_start; |
856a6f1d | 850 | struct mapped_device *md; |
84c89557 | 851 | unsigned change_uuid = (param->flags & DM_UUID_FLAG) ? 1 : 0; |
1da177e4 | 852 | |
84c89557 PJ |
853 | if (new_data < param->data || |
854 | invalid_str(new_data, (void *) param + param_size) || | |
855 | strlen(new_data) > (change_uuid ? DM_UUID_LEN - 1 : DM_NAME_LEN - 1)) { | |
856 | DMWARN("Invalid new mapped device name or uuid string supplied."); | |
1da177e4 LT |
857 | return -EINVAL; |
858 | } | |
859 | ||
84c89557 PJ |
860 | if (!change_uuid) { |
861 | r = check_name(new_data); | |
862 | if (r) | |
863 | return r; | |
864 | } | |
1da177e4 | 865 | |
84c89557 | 866 | md = dm_hash_rename(param, new_data); |
856a6f1d PR |
867 | if (IS_ERR(md)) |
868 | return PTR_ERR(md); | |
3abf85b5 | 869 | |
856a6f1d PR |
870 | __dev_status(md, param); |
871 | dm_put(md); | |
872 | ||
873 | return 0; | |
1da177e4 LT |
874 | } |
875 | ||
3ac51e74 DW |
876 | static int dev_set_geometry(struct dm_ioctl *param, size_t param_size) |
877 | { | |
878 | int r = -EINVAL, x; | |
879 | struct mapped_device *md; | |
880 | struct hd_geometry geometry; | |
881 | unsigned long indata[4]; | |
882 | char *geostr = (char *) param + param->data_start; | |
31998ef1 | 883 | char dummy; |
3ac51e74 DW |
884 | |
885 | md = find_device(param); | |
886 | if (!md) | |
887 | return -ENXIO; | |
888 | ||
27238b2b | 889 | if (geostr < param->data || |
3ac51e74 DW |
890 | invalid_str(geostr, (void *) param + param_size)) { |
891 | DMWARN("Invalid geometry supplied."); | |
892 | goto out; | |
893 | } | |
894 | ||
31998ef1 MP |
895 | x = sscanf(geostr, "%lu %lu %lu %lu%c", indata, |
896 | indata + 1, indata + 2, indata + 3, &dummy); | |
3ac51e74 DW |
897 | |
898 | if (x != 4) { | |
899 | DMWARN("Unable to interpret geometry settings."); | |
900 | goto out; | |
901 | } | |
902 | ||
903 | if (indata[0] > 65535 || indata[1] > 255 || | |
904 | indata[2] > 255 || indata[3] > ULONG_MAX) { | |
905 | DMWARN("Geometry exceeds range limits."); | |
906 | goto out; | |
907 | } | |
908 | ||
909 | geometry.cylinders = indata[0]; | |
910 | geometry.heads = indata[1]; | |
911 | geometry.sectors = indata[2]; | |
912 | geometry.start = indata[3]; | |
913 | ||
914 | r = dm_set_geometry(md, &geometry); | |
3ac51e74 DW |
915 | |
916 | param->data_size = 0; | |
917 | ||
918 | out: | |
919 | dm_put(md); | |
920 | return r; | |
921 | } | |
922 | ||
1da177e4 LT |
923 | static int do_suspend(struct dm_ioctl *param) |
924 | { | |
925 | int r = 0; | |
a3d77d35 | 926 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
927 | struct mapped_device *md; |
928 | ||
929 | md = find_device(param); | |
930 | if (!md) | |
931 | return -ENXIO; | |
932 | ||
6da487dc | 933 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 934 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
935 | if (param->flags & DM_NOFLUSH_FLAG) |
936 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
6da487dc | 937 | |
094ea9a0 | 938 | if (!dm_suspended_md(md)) { |
a3d77d35 | 939 | r = dm_suspend(md, suspend_flags); |
094ea9a0 AK |
940 | if (r) |
941 | goto out; | |
942 | } | |
1da177e4 | 943 | |
094ea9a0 | 944 | __dev_status(md, param); |
1da177e4 | 945 | |
094ea9a0 | 946 | out: |
1da177e4 | 947 | dm_put(md); |
094ea9a0 | 948 | |
1da177e4 LT |
949 | return r; |
950 | } | |
951 | ||
952 | static int do_resume(struct dm_ioctl *param) | |
953 | { | |
954 | int r = 0; | |
a3d77d35 | 955 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
956 | struct hash_cell *hc; |
957 | struct mapped_device *md; | |
042d2a9b | 958 | struct dm_table *new_map, *old_map = NULL; |
1da177e4 LT |
959 | |
960 | down_write(&_hash_lock); | |
961 | ||
962 | hc = __find_device_hash_cell(param); | |
963 | if (!hc) { | |
810b4923 | 964 | DMDEBUG_LIMIT("device doesn't appear to be in the dev hash table."); |
1da177e4 LT |
965 | up_write(&_hash_lock); |
966 | return -ENXIO; | |
967 | } | |
968 | ||
969 | md = hc->md; | |
1da177e4 LT |
970 | |
971 | new_map = hc->new_map; | |
972 | hc->new_map = NULL; | |
973 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
974 | ||
975 | up_write(&_hash_lock); | |
976 | ||
977 | /* Do we need to load a new map ? */ | |
978 | if (new_map) { | |
979 | /* Suspend if it isn't already suspended */ | |
6da487dc | 980 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 981 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
982 | if (param->flags & DM_NOFLUSH_FLAG) |
983 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
4f186f8b | 984 | if (!dm_suspended_md(md)) |
a3d77d35 | 985 | dm_suspend(md, suspend_flags); |
1da177e4 | 986 | |
042d2a9b AK |
987 | old_map = dm_swap_table(md, new_map); |
988 | if (IS_ERR(old_map)) { | |
d5816876 | 989 | dm_table_destroy(new_map); |
1da177e4 | 990 | dm_put(md); |
042d2a9b | 991 | return PTR_ERR(old_map); |
1da177e4 LT |
992 | } |
993 | ||
994 | if (dm_table_get_mode(new_map) & FMODE_WRITE) | |
995 | set_disk_ro(dm_disk(md), 0); | |
996 | else | |
997 | set_disk_ro(dm_disk(md), 1); | |
1da177e4 LT |
998 | } |
999 | ||
0f3649a9 | 1000 | if (dm_suspended_md(md)) { |
1da177e4 | 1001 | r = dm_resume(md); |
3abf85b5 PR |
1002 | if (!r && !dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr)) |
1003 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
0f3649a9 | 1004 | } |
1da177e4 | 1005 | |
042d2a9b AK |
1006 | if (old_map) |
1007 | dm_table_destroy(old_map); | |
60935eb2 | 1008 | |
0f3649a9 | 1009 | if (!r) |
094ea9a0 | 1010 | __dev_status(md, param); |
1da177e4 LT |
1011 | |
1012 | dm_put(md); | |
1013 | return r; | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Set or unset the suspension state of a device. | |
1018 | * If the device already is in the requested state we just return its status. | |
1019 | */ | |
1020 | static int dev_suspend(struct dm_ioctl *param, size_t param_size) | |
1021 | { | |
1022 | if (param->flags & DM_SUSPEND_FLAG) | |
1023 | return do_suspend(param); | |
1024 | ||
1025 | return do_resume(param); | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * Copies device info back to user space, used by | |
1030 | * the create and info ioctls. | |
1031 | */ | |
1032 | static int dev_status(struct dm_ioctl *param, size_t param_size) | |
1033 | { | |
1da177e4 LT |
1034 | struct mapped_device *md; |
1035 | ||
1036 | md = find_device(param); | |
1037 | if (!md) | |
1038 | return -ENXIO; | |
1039 | ||
094ea9a0 | 1040 | __dev_status(md, param); |
1da177e4 | 1041 | dm_put(md); |
094ea9a0 AK |
1042 | |
1043 | return 0; | |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | /* | |
1047 | * Build up the status struct for each target | |
1048 | */ | |
1049 | static void retrieve_status(struct dm_table *table, | |
1050 | struct dm_ioctl *param, size_t param_size) | |
1051 | { | |
1052 | unsigned int i, num_targets; | |
1053 | struct dm_target_spec *spec; | |
1054 | char *outbuf, *outptr; | |
1055 | status_type_t type; | |
1056 | size_t remaining, len, used = 0; | |
1057 | ||
1058 | outptr = outbuf = get_result_buffer(param, param_size, &len); | |
1059 | ||
1060 | if (param->flags & DM_STATUS_TABLE_FLAG) | |
1061 | type = STATUSTYPE_TABLE; | |
1062 | else | |
1063 | type = STATUSTYPE_INFO; | |
1064 | ||
1065 | /* Get all the target info */ | |
1066 | num_targets = dm_table_get_num_targets(table); | |
1067 | for (i = 0; i < num_targets; i++) { | |
1068 | struct dm_target *ti = dm_table_get_target(table, i); | |
1069 | ||
1070 | remaining = len - (outptr - outbuf); | |
1071 | if (remaining <= sizeof(struct dm_target_spec)) { | |
1072 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1073 | break; | |
1074 | } | |
1075 | ||
1076 | spec = (struct dm_target_spec *) outptr; | |
1077 | ||
1078 | spec->status = 0; | |
1079 | spec->sector_start = ti->begin; | |
1080 | spec->length = ti->len; | |
1081 | strncpy(spec->target_type, ti->type->name, | |
1082 | sizeof(spec->target_type)); | |
1083 | ||
1084 | outptr += sizeof(struct dm_target_spec); | |
1085 | remaining = len - (outptr - outbuf); | |
1086 | if (remaining <= 0) { | |
1087 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1088 | break; | |
1089 | } | |
1090 | ||
1091 | /* Get the status/table string from the target driver */ | |
1092 | if (ti->type->status) { | |
1093 | if (ti->type->status(ti, type, outptr, remaining)) { | |
1094 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1095 | break; | |
1096 | } | |
1097 | } else | |
1098 | outptr[0] = '\0'; | |
1099 | ||
1100 | outptr += strlen(outptr) + 1; | |
1101 | used = param->data_start + (outptr - outbuf); | |
1102 | ||
1103 | outptr = align_ptr(outptr); | |
1104 | spec->next = outptr - outbuf; | |
1105 | } | |
1106 | ||
1107 | if (used) | |
1108 | param->data_size = used; | |
1109 | ||
1110 | param->target_count = num_targets; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Wait for a device to report an event | |
1115 | */ | |
1116 | static int dev_wait(struct dm_ioctl *param, size_t param_size) | |
1117 | { | |
094ea9a0 | 1118 | int r = 0; |
1da177e4 LT |
1119 | struct mapped_device *md; |
1120 | struct dm_table *table; | |
1121 | ||
1122 | md = find_device(param); | |
1123 | if (!md) | |
1124 | return -ENXIO; | |
1125 | ||
1126 | /* | |
1127 | * Wait for a notification event | |
1128 | */ | |
1129 | if (dm_wait_event(md, param->event_nr)) { | |
1130 | r = -ERESTARTSYS; | |
1131 | goto out; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * The userland program is going to want to know what | |
1136 | * changed to trigger the event, so we may as well tell | |
1137 | * him and save an ioctl. | |
1138 | */ | |
094ea9a0 | 1139 | __dev_status(md, param); |
1da177e4 | 1140 | |
1d0f3ce8 | 1141 | table = dm_get_live_or_inactive_table(md, param); |
1da177e4 LT |
1142 | if (table) { |
1143 | retrieve_status(table, param, param_size); | |
1144 | dm_table_put(table); | |
1145 | } | |
1146 | ||
094ea9a0 | 1147 | out: |
1da177e4 | 1148 | dm_put(md); |
094ea9a0 | 1149 | |
1da177e4 LT |
1150 | return r; |
1151 | } | |
1152 | ||
aeb5d727 | 1153 | static inline fmode_t get_mode(struct dm_ioctl *param) |
1da177e4 | 1154 | { |
aeb5d727 | 1155 | fmode_t mode = FMODE_READ | FMODE_WRITE; |
1da177e4 LT |
1156 | |
1157 | if (param->flags & DM_READONLY_FLAG) | |
1158 | mode = FMODE_READ; | |
1159 | ||
1160 | return mode; | |
1161 | } | |
1162 | ||
1163 | static int next_target(struct dm_target_spec *last, uint32_t next, void *end, | |
1164 | struct dm_target_spec **spec, char **target_params) | |
1165 | { | |
1166 | *spec = (struct dm_target_spec *) ((unsigned char *) last + next); | |
1167 | *target_params = (char *) (*spec + 1); | |
1168 | ||
1169 | if (*spec < (last + 1)) | |
1170 | return -EINVAL; | |
1171 | ||
1172 | return invalid_str(*target_params, end); | |
1173 | } | |
1174 | ||
1175 | static int populate_table(struct dm_table *table, | |
1176 | struct dm_ioctl *param, size_t param_size) | |
1177 | { | |
1178 | int r; | |
1179 | unsigned int i = 0; | |
1180 | struct dm_target_spec *spec = (struct dm_target_spec *) param; | |
1181 | uint32_t next = param->data_start; | |
1182 | void *end = (void *) param + param_size; | |
1183 | char *target_params; | |
1184 | ||
1185 | if (!param->target_count) { | |
1186 | DMWARN("populate_table: no targets specified"); | |
1187 | return -EINVAL; | |
1188 | } | |
1189 | ||
1190 | for (i = 0; i < param->target_count; i++) { | |
1191 | ||
1192 | r = next_target(spec, next, end, &spec, &target_params); | |
1193 | if (r) { | |
1194 | DMWARN("unable to find target"); | |
1195 | return r; | |
1196 | } | |
1197 | ||
1198 | r = dm_table_add_target(table, spec->target_type, | |
1199 | (sector_t) spec->sector_start, | |
1200 | (sector_t) spec->length, | |
1201 | target_params); | |
1202 | if (r) { | |
1203 | DMWARN("error adding target to table"); | |
1204 | return r; | |
1205 | } | |
1206 | ||
1207 | next = spec->next; | |
1208 | } | |
1209 | ||
1210 | return dm_table_complete(table); | |
1211 | } | |
1212 | ||
1213 | static int table_load(struct dm_ioctl *param, size_t param_size) | |
1214 | { | |
1215 | int r; | |
1216 | struct hash_cell *hc; | |
1217 | struct dm_table *t; | |
1134e5ae | 1218 | struct mapped_device *md; |
36a0456f | 1219 | struct target_type *immutable_target_type; |
1134e5ae MA |
1220 | |
1221 | md = find_device(param); | |
1222 | if (!md) | |
1223 | return -ENXIO; | |
1da177e4 | 1224 | |
1134e5ae | 1225 | r = dm_table_create(&t, get_mode(param), param->target_count, md); |
1da177e4 | 1226 | if (r) |
1134e5ae | 1227 | goto out; |
1da177e4 LT |
1228 | |
1229 | r = populate_table(t, param, param_size); | |
1230 | if (r) { | |
f80a5570 | 1231 | dm_table_destroy(t); |
1134e5ae | 1232 | goto out; |
1da177e4 LT |
1233 | } |
1234 | ||
36a0456f AK |
1235 | immutable_target_type = dm_get_immutable_target_type(md); |
1236 | if (immutable_target_type && | |
1237 | (immutable_target_type != dm_table_get_immutable_target_type(t))) { | |
1238 | DMWARN("can't replace immutable target type %s", | |
1239 | immutable_target_type->name); | |
1240 | dm_table_destroy(t); | |
1241 | r = -EINVAL; | |
1242 | goto out; | |
1243 | } | |
1244 | ||
4a0b4ddf | 1245 | /* Protect md->type and md->queue against concurrent table loads. */ |
a5664dad MS |
1246 | dm_lock_md_type(md); |
1247 | if (dm_get_md_type(md) == DM_TYPE_NONE) | |
1248 | /* Initial table load: acquire type of table. */ | |
1249 | dm_set_md_type(md, dm_table_get_type(t)); | |
1250 | else if (dm_get_md_type(md) != dm_table_get_type(t)) { | |
1251 | DMWARN("can't change device type after initial table load."); | |
1252 | dm_table_destroy(t); | |
1253 | dm_unlock_md_type(md); | |
1254 | r = -EINVAL; | |
1255 | goto out; | |
1256 | } | |
4a0b4ddf MS |
1257 | |
1258 | /* setup md->queue to reflect md's type (may block) */ | |
1259 | r = dm_setup_md_queue(md); | |
1260 | if (r) { | |
1261 | DMWARN("unable to set up device queue for new table."); | |
1262 | dm_table_destroy(t); | |
1263 | dm_unlock_md_type(md); | |
1264 | goto out; | |
1265 | } | |
a5664dad MS |
1266 | dm_unlock_md_type(md); |
1267 | ||
1268 | /* stage inactive table */ | |
1da177e4 | 1269 | down_write(&_hash_lock); |
1134e5ae MA |
1270 | hc = dm_get_mdptr(md); |
1271 | if (!hc || hc->md != md) { | |
1272 | DMWARN("device has been removed from the dev hash table."); | |
f80a5570 | 1273 | dm_table_destroy(t); |
1134e5ae MA |
1274 | up_write(&_hash_lock); |
1275 | r = -ENXIO; | |
1276 | goto out; | |
1da177e4 LT |
1277 | } |
1278 | ||
1279 | if (hc->new_map) | |
d5816876 | 1280 | dm_table_destroy(hc->new_map); |
1da177e4 | 1281 | hc->new_map = t; |
1134e5ae MA |
1282 | up_write(&_hash_lock); |
1283 | ||
1da177e4 | 1284 | param->flags |= DM_INACTIVE_PRESENT_FLAG; |
094ea9a0 | 1285 | __dev_status(md, param); |
1134e5ae MA |
1286 | |
1287 | out: | |
1288 | dm_put(md); | |
1da177e4 | 1289 | |
1da177e4 LT |
1290 | return r; |
1291 | } | |
1292 | ||
1293 | static int table_clear(struct dm_ioctl *param, size_t param_size) | |
1294 | { | |
1da177e4 | 1295 | struct hash_cell *hc; |
7ec75f25 | 1296 | struct mapped_device *md; |
1da177e4 LT |
1297 | |
1298 | down_write(&_hash_lock); | |
1299 | ||
1300 | hc = __find_device_hash_cell(param); | |
1301 | if (!hc) { | |
810b4923 | 1302 | DMDEBUG_LIMIT("device doesn't appear to be in the dev hash table."); |
1da177e4 LT |
1303 | up_write(&_hash_lock); |
1304 | return -ENXIO; | |
1305 | } | |
1306 | ||
1307 | if (hc->new_map) { | |
d5816876 | 1308 | dm_table_destroy(hc->new_map); |
1da177e4 LT |
1309 | hc->new_map = NULL; |
1310 | } | |
1311 | ||
1312 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
1313 | ||
094ea9a0 | 1314 | __dev_status(hc->md, param); |
7ec75f25 | 1315 | md = hc->md; |
1da177e4 | 1316 | up_write(&_hash_lock); |
7ec75f25 | 1317 | dm_put(md); |
094ea9a0 AK |
1318 | |
1319 | return 0; | |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | /* | |
1323 | * Retrieves a list of devices used by a particular dm device. | |
1324 | */ | |
1325 | static void retrieve_deps(struct dm_table *table, | |
1326 | struct dm_ioctl *param, size_t param_size) | |
1327 | { | |
1328 | unsigned int count = 0; | |
1329 | struct list_head *tmp; | |
1330 | size_t len, needed; | |
82b1519b | 1331 | struct dm_dev_internal *dd; |
1da177e4 LT |
1332 | struct dm_target_deps *deps; |
1333 | ||
1334 | deps = get_result_buffer(param, param_size, &len); | |
1335 | ||
1336 | /* | |
1337 | * Count the devices. | |
1338 | */ | |
1339 | list_for_each (tmp, dm_table_get_devices(table)) | |
1340 | count++; | |
1341 | ||
1342 | /* | |
1343 | * Check we have enough space. | |
1344 | */ | |
1345 | needed = sizeof(*deps) + (sizeof(*deps->dev) * count); | |
1346 | if (len < needed) { | |
1347 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1348 | return; | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * Fill in the devices. | |
1353 | */ | |
1354 | deps->count = count; | |
1355 | count = 0; | |
1356 | list_for_each_entry (dd, dm_table_get_devices(table), list) | |
82b1519b | 1357 | deps->dev[count++] = huge_encode_dev(dd->dm_dev.bdev->bd_dev); |
1da177e4 LT |
1358 | |
1359 | param->data_size = param->data_start + needed; | |
1360 | } | |
1361 | ||
1362 | static int table_deps(struct dm_ioctl *param, size_t param_size) | |
1363 | { | |
1da177e4 LT |
1364 | struct mapped_device *md; |
1365 | struct dm_table *table; | |
1366 | ||
1367 | md = find_device(param); | |
1368 | if (!md) | |
1369 | return -ENXIO; | |
1370 | ||
094ea9a0 | 1371 | __dev_status(md, param); |
1da177e4 | 1372 | |
1d0f3ce8 | 1373 | table = dm_get_live_or_inactive_table(md, param); |
1da177e4 LT |
1374 | if (table) { |
1375 | retrieve_deps(table, param, param_size); | |
1376 | dm_table_put(table); | |
1377 | } | |
1378 | ||
1da177e4 | 1379 | dm_put(md); |
094ea9a0 AK |
1380 | |
1381 | return 0; | |
1da177e4 LT |
1382 | } |
1383 | ||
1384 | /* | |
1385 | * Return the status of a device as a text string for each | |
1386 | * target. | |
1387 | */ | |
1388 | static int table_status(struct dm_ioctl *param, size_t param_size) | |
1389 | { | |
1da177e4 LT |
1390 | struct mapped_device *md; |
1391 | struct dm_table *table; | |
1392 | ||
1393 | md = find_device(param); | |
1394 | if (!md) | |
1395 | return -ENXIO; | |
1396 | ||
094ea9a0 | 1397 | __dev_status(md, param); |
1da177e4 | 1398 | |
1d0f3ce8 | 1399 | table = dm_get_live_or_inactive_table(md, param); |
1da177e4 LT |
1400 | if (table) { |
1401 | retrieve_status(table, param, param_size); | |
1402 | dm_table_put(table); | |
1403 | } | |
1404 | ||
1da177e4 | 1405 | dm_put(md); |
094ea9a0 AK |
1406 | |
1407 | return 0; | |
1da177e4 LT |
1408 | } |
1409 | ||
1410 | /* | |
1411 | * Pass a message to the target that's at the supplied device offset. | |
1412 | */ | |
1413 | static int target_message(struct dm_ioctl *param, size_t param_size) | |
1414 | { | |
1415 | int r, argc; | |
1416 | char **argv; | |
1417 | struct mapped_device *md; | |
1418 | struct dm_table *table; | |
1419 | struct dm_target *ti; | |
1420 | struct dm_target_msg *tmsg = (void *) param + param->data_start; | |
1421 | ||
1422 | md = find_device(param); | |
1423 | if (!md) | |
1424 | return -ENXIO; | |
1425 | ||
027d50f9 | 1426 | if (tmsg < (struct dm_target_msg *) param->data || |
1da177e4 LT |
1427 | invalid_str(tmsg->message, (void *) param + param_size)) { |
1428 | DMWARN("Invalid target message parameters."); | |
1429 | r = -EINVAL; | |
1430 | goto out; | |
1431 | } | |
1432 | ||
1433 | r = dm_split_args(&argc, &argv, tmsg->message); | |
1434 | if (r) { | |
1435 | DMWARN("Failed to split target message parameters"); | |
1436 | goto out; | |
1437 | } | |
1438 | ||
2ca4c92f AK |
1439 | if (!argc) { |
1440 | DMWARN("Empty message received."); | |
902c6a96 | 1441 | goto out_argv; |
2ca4c92f AK |
1442 | } |
1443 | ||
7c666411 | 1444 | table = dm_get_live_table(md); |
1da177e4 LT |
1445 | if (!table) |
1446 | goto out_argv; | |
1447 | ||
c50abeb3 MA |
1448 | if (dm_deleting_md(md)) { |
1449 | r = -ENXIO; | |
1450 | goto out_table; | |
1451 | } | |
1452 | ||
512875bd JN |
1453 | ti = dm_table_find_target(table, tmsg->sector); |
1454 | if (!dm_target_is_valid(ti)) { | |
1da177e4 LT |
1455 | DMWARN("Target message sector outside device."); |
1456 | r = -EINVAL; | |
512875bd | 1457 | } else if (ti->type->message) |
1da177e4 LT |
1458 | r = ti->type->message(ti, argc, argv); |
1459 | else { | |
1460 | DMWARN("Target type does not support messages"); | |
1461 | r = -EINVAL; | |
1462 | } | |
1463 | ||
c50abeb3 | 1464 | out_table: |
1da177e4 LT |
1465 | dm_table_put(table); |
1466 | out_argv: | |
1467 | kfree(argv); | |
1468 | out: | |
1469 | param->data_size = 0; | |
1470 | dm_put(md); | |
1471 | return r; | |
1472 | } | |
1473 | ||
1474 | /*----------------------------------------------------------------- | |
1475 | * Implementation of open/close/ioctl on the special char | |
1476 | * device. | |
1477 | *---------------------------------------------------------------*/ | |
1478 | static ioctl_fn lookup_ioctl(unsigned int cmd) | |
1479 | { | |
1480 | static struct { | |
1481 | int cmd; | |
1482 | ioctl_fn fn; | |
1483 | } _ioctls[] = { | |
1484 | {DM_VERSION_CMD, NULL}, /* version is dealt with elsewhere */ | |
1485 | {DM_REMOVE_ALL_CMD, remove_all}, | |
1486 | {DM_LIST_DEVICES_CMD, list_devices}, | |
1487 | ||
1488 | {DM_DEV_CREATE_CMD, dev_create}, | |
1489 | {DM_DEV_REMOVE_CMD, dev_remove}, | |
1490 | {DM_DEV_RENAME_CMD, dev_rename}, | |
1491 | {DM_DEV_SUSPEND_CMD, dev_suspend}, | |
1492 | {DM_DEV_STATUS_CMD, dev_status}, | |
1493 | {DM_DEV_WAIT_CMD, dev_wait}, | |
1494 | ||
1495 | {DM_TABLE_LOAD_CMD, table_load}, | |
1496 | {DM_TABLE_CLEAR_CMD, table_clear}, | |
1497 | {DM_TABLE_DEPS_CMD, table_deps}, | |
1498 | {DM_TABLE_STATUS_CMD, table_status}, | |
1499 | ||
1500 | {DM_LIST_VERSIONS_CMD, list_versions}, | |
1501 | ||
3ac51e74 DW |
1502 | {DM_TARGET_MSG_CMD, target_message}, |
1503 | {DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry} | |
1da177e4 LT |
1504 | }; |
1505 | ||
1506 | return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn; | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * As well as checking the version compatibility this always | |
1511 | * copies the kernel interface version out. | |
1512 | */ | |
1513 | static int check_version(unsigned int cmd, struct dm_ioctl __user *user) | |
1514 | { | |
1515 | uint32_t version[3]; | |
1516 | int r = 0; | |
1517 | ||
1518 | if (copy_from_user(version, user->version, sizeof(version))) | |
1519 | return -EFAULT; | |
1520 | ||
1521 | if ((DM_VERSION_MAJOR != version[0]) || | |
1522 | (DM_VERSION_MINOR < version[1])) { | |
1523 | DMWARN("ioctl interface mismatch: " | |
1524 | "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)", | |
1525 | DM_VERSION_MAJOR, DM_VERSION_MINOR, | |
1526 | DM_VERSION_PATCHLEVEL, | |
1527 | version[0], version[1], version[2], cmd); | |
1528 | r = -EINVAL; | |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * Fill in the kernel version. | |
1533 | */ | |
1534 | version[0] = DM_VERSION_MAJOR; | |
1535 | version[1] = DM_VERSION_MINOR; | |
1536 | version[2] = DM_VERSION_PATCHLEVEL; | |
1537 | if (copy_to_user(user->version, version, sizeof(version))) | |
1538 | return -EFAULT; | |
1539 | ||
1540 | return r; | |
1541 | } | |
1542 | ||
1da177e4 LT |
1543 | static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param) |
1544 | { | |
1545 | struct dm_ioctl tmp, *dmi; | |
f8681205 | 1546 | int secure_data; |
1da177e4 | 1547 | |
76c072b4 | 1548 | if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data))) |
1da177e4 LT |
1549 | return -EFAULT; |
1550 | ||
76c072b4 | 1551 | if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data))) |
1da177e4 LT |
1552 | return -EINVAL; |
1553 | ||
f8681205 MB |
1554 | secure_data = tmp.flags & DM_SECURE_DATA_FLAG; |
1555 | ||
bb56acf8 | 1556 | dmi = vmalloc(tmp.data_size); |
f8681205 MB |
1557 | if (!dmi) { |
1558 | if (secure_data && clear_user(user, tmp.data_size)) | |
1559 | return -EFAULT; | |
1da177e4 | 1560 | return -ENOMEM; |
f8681205 | 1561 | } |
1da177e4 | 1562 | |
6bb43b5d MB |
1563 | if (copy_from_user(dmi, user, tmp.data_size)) |
1564 | goto bad; | |
1da177e4 | 1565 | |
f8681205 MB |
1566 | /* Wipe the user buffer so we do not return it to userspace */ |
1567 | if (secure_data && clear_user(user, tmp.data_size)) | |
1568 | goto bad; | |
1569 | ||
1da177e4 LT |
1570 | *param = dmi; |
1571 | return 0; | |
6bb43b5d MB |
1572 | |
1573 | bad: | |
f8681205 MB |
1574 | if (secure_data) |
1575 | memset(dmi, 0, tmp.data_size); | |
6bb43b5d MB |
1576 | vfree(dmi); |
1577 | return -EFAULT; | |
1da177e4 LT |
1578 | } |
1579 | ||
1580 | static int validate_params(uint cmd, struct dm_ioctl *param) | |
1581 | { | |
1582 | /* Always clear this flag */ | |
1583 | param->flags &= ~DM_BUFFER_FULL_FLAG; | |
3abf85b5 | 1584 | param->flags &= ~DM_UEVENT_GENERATED_FLAG; |
f8681205 | 1585 | param->flags &= ~DM_SECURE_DATA_FLAG; |
1da177e4 LT |
1586 | |
1587 | /* Ignores parameters */ | |
1588 | if (cmd == DM_REMOVE_ALL_CMD || | |
1589 | cmd == DM_LIST_DEVICES_CMD || | |
1590 | cmd == DM_LIST_VERSIONS_CMD) | |
1591 | return 0; | |
1592 | ||
1593 | if ((cmd == DM_DEV_CREATE_CMD)) { | |
1594 | if (!*param->name) { | |
1595 | DMWARN("name not supplied when creating device"); | |
1596 | return -EINVAL; | |
1597 | } | |
1598 | } else if ((*param->uuid && *param->name)) { | |
1599 | DMWARN("only supply one of name or uuid, cmd(%u)", cmd); | |
1600 | return -EINVAL; | |
1601 | } | |
1602 | ||
1603 | /* Ensure strings are terminated */ | |
1604 | param->name[DM_NAME_LEN - 1] = '\0'; | |
1605 | param->uuid[DM_UUID_LEN - 1] = '\0'; | |
1606 | ||
1607 | return 0; | |
1608 | } | |
1609 | ||
27238b2b | 1610 | static int ctl_ioctl(uint command, struct dm_ioctl __user *user) |
1da177e4 LT |
1611 | { |
1612 | int r = 0; | |
f8681205 | 1613 | int wipe_buffer; |
1da177e4 | 1614 | unsigned int cmd; |
a26ffd4a | 1615 | struct dm_ioctl *uninitialized_var(param); |
1da177e4 | 1616 | ioctl_fn fn = NULL; |
6bb43b5d | 1617 | size_t input_param_size; |
1da177e4 LT |
1618 | |
1619 | /* only root can play with this */ | |
1620 | if (!capable(CAP_SYS_ADMIN)) | |
1621 | return -EACCES; | |
1622 | ||
1623 | if (_IOC_TYPE(command) != DM_IOCTL) | |
1624 | return -ENOTTY; | |
1625 | ||
1626 | cmd = _IOC_NR(command); | |
1627 | ||
1628 | /* | |
1629 | * Check the interface version passed in. This also | |
1630 | * writes out the kernel's interface version. | |
1631 | */ | |
1632 | r = check_version(cmd, user); | |
1633 | if (r) | |
1634 | return r; | |
1635 | ||
1636 | /* | |
1637 | * Nothing more to do for the version command. | |
1638 | */ | |
1639 | if (cmd == DM_VERSION_CMD) | |
1640 | return 0; | |
1641 | ||
1642 | fn = lookup_ioctl(cmd); | |
1643 | if (!fn) { | |
1644 | DMWARN("dm_ctl_ioctl: unknown command 0x%x", command); | |
1645 | return -ENOTTY; | |
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * Trying to avoid low memory issues when a device is | |
1650 | * suspended. | |
1651 | */ | |
1652 | current->flags |= PF_MEMALLOC; | |
1653 | ||
1654 | /* | |
1655 | * Copy the parameters into kernel space. | |
1656 | */ | |
1657 | r = copy_params(user, ¶m); | |
1da177e4 | 1658 | |
dab6a429 AK |
1659 | current->flags &= ~PF_MEMALLOC; |
1660 | ||
1661 | if (r) | |
1662 | return r; | |
1da177e4 | 1663 | |
f8681205 MB |
1664 | input_param_size = param->data_size; |
1665 | wipe_buffer = param->flags & DM_SECURE_DATA_FLAG; | |
1666 | ||
1da177e4 LT |
1667 | r = validate_params(cmd, param); |
1668 | if (r) | |
1669 | goto out; | |
1670 | ||
1da177e4 | 1671 | param->data_size = sizeof(*param); |
6bb43b5d | 1672 | r = fn(param, input_param_size); |
1da177e4 LT |
1673 | |
1674 | /* | |
1675 | * Copy the results back to userland. | |
1676 | */ | |
1677 | if (!r && copy_to_user(user, param, param->data_size)) | |
1678 | r = -EFAULT; | |
1679 | ||
6bb43b5d | 1680 | out: |
f8681205 MB |
1681 | if (wipe_buffer) |
1682 | memset(param, 0, input_param_size); | |
1683 | ||
6bb43b5d | 1684 | vfree(param); |
1da177e4 LT |
1685 | return r; |
1686 | } | |
1687 | ||
27238b2b AK |
1688 | static long dm_ctl_ioctl(struct file *file, uint command, ulong u) |
1689 | { | |
1690 | return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u); | |
1691 | } | |
1692 | ||
76c072b4 MB |
1693 | #ifdef CONFIG_COMPAT |
1694 | static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u) | |
1695 | { | |
1696 | return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u)); | |
1697 | } | |
1698 | #else | |
1699 | #define dm_compat_ctl_ioctl NULL | |
1700 | #endif | |
1701 | ||
fa027c2a | 1702 | static const struct file_operations _ctl_fops = { |
402ab352 | 1703 | .open = nonseekable_open, |
27238b2b | 1704 | .unlocked_ioctl = dm_ctl_ioctl, |
76c072b4 | 1705 | .compat_ioctl = dm_compat_ctl_ioctl, |
1da177e4 | 1706 | .owner = THIS_MODULE, |
6038f373 | 1707 | .llseek = noop_llseek, |
1da177e4 LT |
1708 | }; |
1709 | ||
1710 | static struct miscdevice _dm_misc = { | |
7e507eb6 | 1711 | .minor = MAPPER_CTRL_MINOR, |
1da177e4 | 1712 | .name = DM_NAME, |
7e507eb6 | 1713 | .nodename = DM_DIR "/" DM_CONTROL_NODE, |
1da177e4 LT |
1714 | .fops = &_ctl_fops |
1715 | }; | |
1716 | ||
7e507eb6 PR |
1717 | MODULE_ALIAS_MISCDEV(MAPPER_CTRL_MINOR); |
1718 | MODULE_ALIAS("devname:" DM_DIR "/" DM_CONTROL_NODE); | |
1719 | ||
1da177e4 LT |
1720 | /* |
1721 | * Create misc character device and link to DM_DIR/control. | |
1722 | */ | |
1723 | int __init dm_interface_init(void) | |
1724 | { | |
1725 | int r; | |
1726 | ||
1727 | r = dm_hash_init(); | |
1728 | if (r) | |
1729 | return r; | |
1730 | ||
1731 | r = misc_register(&_dm_misc); | |
1732 | if (r) { | |
1733 | DMERR("misc_register failed for control device"); | |
1734 | dm_hash_exit(); | |
1735 | return r; | |
1736 | } | |
1737 | ||
1738 | DMINFO("%d.%d.%d%s initialised: %s", DM_VERSION_MAJOR, | |
1739 | DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, DM_VERSION_EXTRA, | |
1740 | DM_DRIVER_EMAIL); | |
1741 | return 0; | |
1742 | } | |
1743 | ||
1744 | void dm_interface_exit(void) | |
1745 | { | |
1746 | if (misc_deregister(&_dm_misc) < 0) | |
1747 | DMERR("misc_deregister failed for control device"); | |
1748 | ||
1749 | dm_hash_exit(); | |
1750 | } | |
96a1f7db MA |
1751 | |
1752 | /** | |
1753 | * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers | |
1754 | * @md: Pointer to mapped_device | |
1755 | * @name: Buffer (size DM_NAME_LEN) for name | |
1756 | * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined | |
1757 | */ | |
1758 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) | |
1759 | { | |
1760 | int r = 0; | |
1761 | struct hash_cell *hc; | |
1762 | ||
1763 | if (!md) | |
1764 | return -ENXIO; | |
1765 | ||
6076905b | 1766 | mutex_lock(&dm_hash_cells_mutex); |
96a1f7db MA |
1767 | hc = dm_get_mdptr(md); |
1768 | if (!hc || hc->md != md) { | |
1769 | r = -ENXIO; | |
1770 | goto out; | |
1771 | } | |
1772 | ||
23d39f63 MB |
1773 | if (name) |
1774 | strcpy(name, hc->name); | |
1775 | if (uuid) | |
1776 | strcpy(uuid, hc->uuid ? : ""); | |
96a1f7db MA |
1777 | |
1778 | out: | |
6076905b | 1779 | mutex_unlock(&dm_hash_cells_mutex); |
96a1f7db MA |
1780 | |
1781 | return r; | |
1782 | } |