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 | ||
131 | /*----------------------------------------------------------------- | |
132 | * Inserting, removing and renaming a device. | |
133 | *---------------------------------------------------------------*/ | |
1da177e4 LT |
134 | static struct hash_cell *alloc_cell(const char *name, const char *uuid, |
135 | struct mapped_device *md) | |
136 | { | |
137 | struct hash_cell *hc; | |
138 | ||
139 | hc = kmalloc(sizeof(*hc), GFP_KERNEL); | |
140 | if (!hc) | |
141 | return NULL; | |
142 | ||
543537bd | 143 | hc->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
144 | if (!hc->name) { |
145 | kfree(hc); | |
146 | return NULL; | |
147 | } | |
148 | ||
149 | if (!uuid) | |
150 | hc->uuid = NULL; | |
151 | ||
152 | else { | |
543537bd | 153 | hc->uuid = kstrdup(uuid, GFP_KERNEL); |
1da177e4 LT |
154 | if (!hc->uuid) { |
155 | kfree(hc->name); | |
156 | kfree(hc); | |
157 | return NULL; | |
158 | } | |
159 | } | |
160 | ||
161 | INIT_LIST_HEAD(&hc->name_list); | |
162 | INIT_LIST_HEAD(&hc->uuid_list); | |
163 | hc->md = md; | |
164 | hc->new_map = NULL; | |
165 | return hc; | |
166 | } | |
167 | ||
168 | static void free_cell(struct hash_cell *hc) | |
169 | { | |
170 | if (hc) { | |
171 | kfree(hc->name); | |
172 | kfree(hc->uuid); | |
173 | kfree(hc); | |
174 | } | |
175 | } | |
176 | ||
1da177e4 LT |
177 | /* |
178 | * The kdev_t and uuid of a device can never change once it is | |
179 | * initially inserted. | |
180 | */ | |
181 | static int dm_hash_insert(const char *name, const char *uuid, struct mapped_device *md) | |
182 | { | |
7ec75f25 | 183 | struct hash_cell *cell, *hc; |
1da177e4 LT |
184 | |
185 | /* | |
186 | * Allocate the new cells. | |
187 | */ | |
188 | cell = alloc_cell(name, uuid, md); | |
189 | if (!cell) | |
190 | return -ENOMEM; | |
191 | ||
192 | /* | |
193 | * Insert the cell into both hash tables. | |
194 | */ | |
195 | down_write(&_hash_lock); | |
7ec75f25 JM |
196 | hc = __get_name_cell(name); |
197 | if (hc) { | |
198 | dm_put(hc->md); | |
1da177e4 | 199 | goto bad; |
7ec75f25 | 200 | } |
1da177e4 LT |
201 | |
202 | list_add(&cell->name_list, _name_buckets + hash_str(name)); | |
203 | ||
204 | if (uuid) { | |
7ec75f25 JM |
205 | hc = __get_uuid_cell(uuid); |
206 | if (hc) { | |
1da177e4 | 207 | list_del(&cell->name_list); |
7ec75f25 | 208 | dm_put(hc->md); |
1da177e4 LT |
209 | goto bad; |
210 | } | |
211 | list_add(&cell->uuid_list, _uuid_buckets + hash_str(uuid)); | |
212 | } | |
1da177e4 | 213 | dm_get(md); |
6076905b | 214 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 215 | dm_set_mdptr(md, cell); |
6076905b | 216 | mutex_unlock(&dm_hash_cells_mutex); |
1da177e4 LT |
217 | up_write(&_hash_lock); |
218 | ||
219 | return 0; | |
220 | ||
221 | bad: | |
222 | up_write(&_hash_lock); | |
223 | free_cell(cell); | |
224 | return -EBUSY; | |
225 | } | |
226 | ||
227 | static void __hash_remove(struct hash_cell *hc) | |
228 | { | |
269fd2a6 | 229 | struct dm_table *table; |
230 | ||
1da177e4 LT |
231 | /* remove from the dev hash */ |
232 | list_del(&hc->uuid_list); | |
233 | list_del(&hc->name_list); | |
6076905b | 234 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 235 | dm_set_mdptr(hc->md, NULL); |
6076905b | 236 | mutex_unlock(&dm_hash_cells_mutex); |
269fd2a6 | 237 | |
7c666411 | 238 | table = dm_get_live_table(hc->md); |
269fd2a6 | 239 | if (table) { |
240 | dm_table_event(table); | |
241 | dm_table_put(table); | |
242 | } | |
243 | ||
1da177e4 | 244 | if (hc->new_map) |
d5816876 | 245 | dm_table_destroy(hc->new_map); |
1134e5ae | 246 | dm_put(hc->md); |
1da177e4 LT |
247 | free_cell(hc); |
248 | } | |
249 | ||
5c6bd75d | 250 | static void dm_hash_remove_all(int keep_open_devices) |
1da177e4 | 251 | { |
98f33285 | 252 | int i, dev_skipped; |
1da177e4 | 253 | struct hash_cell *hc; |
98f33285 KU |
254 | struct mapped_device *md; |
255 | ||
256 | retry: | |
257 | dev_skipped = 0; | |
1da177e4 LT |
258 | |
259 | down_write(&_hash_lock); | |
5c6bd75d | 260 | |
1da177e4 | 261 | for (i = 0; i < NUM_BUCKETS; i++) { |
98f33285 KU |
262 | list_for_each_entry(hc, _name_buckets + i, name_list) { |
263 | md = hc->md; | |
264 | dm_get(md); | |
5c6bd75d | 265 | |
98f33285 KU |
266 | if (keep_open_devices && dm_lock_for_deletion(md)) { |
267 | dm_put(md); | |
5c6bd75d AK |
268 | dev_skipped++; |
269 | continue; | |
270 | } | |
98f33285 | 271 | |
1da177e4 | 272 | __hash_remove(hc); |
5c6bd75d | 273 | |
98f33285 | 274 | up_write(&_hash_lock); |
5c6bd75d | 275 | |
98f33285 KU |
276 | dm_put(md); |
277 | ||
278 | /* | |
279 | * Some mapped devices may be using other mapped | |
280 | * devices, so repeat until we make no further | |
281 | * progress. If a new mapped device is created | |
282 | * here it will also get removed. | |
283 | */ | |
284 | goto retry; | |
285 | } | |
5c6bd75d AK |
286 | } |
287 | ||
1da177e4 | 288 | up_write(&_hash_lock); |
98f33285 KU |
289 | |
290 | if (dev_skipped) | |
291 | DMWARN("remove_all left %d open device(s)", dev_skipped); | |
1da177e4 LT |
292 | } |
293 | ||
856a6f1d PR |
294 | static struct mapped_device *dm_hash_rename(struct dm_ioctl *param, |
295 | const char *new) | |
1da177e4 LT |
296 | { |
297 | char *new_name, *old_name; | |
298 | struct hash_cell *hc; | |
81f1777a | 299 | struct dm_table *table; |
856a6f1d | 300 | struct mapped_device *md; |
1da177e4 LT |
301 | |
302 | /* | |
303 | * duplicate new. | |
304 | */ | |
543537bd | 305 | new_name = kstrdup(new, GFP_KERNEL); |
1da177e4 | 306 | if (!new_name) |
856a6f1d | 307 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
308 | |
309 | down_write(&_hash_lock); | |
310 | ||
311 | /* | |
312 | * Is new free ? | |
313 | */ | |
314 | hc = __get_name_cell(new); | |
315 | if (hc) { | |
856a6f1d PR |
316 | DMWARN("asked to rename to an already-existing name %s -> %s", |
317 | param->name, new); | |
7ec75f25 | 318 | dm_put(hc->md); |
1da177e4 LT |
319 | up_write(&_hash_lock); |
320 | kfree(new_name); | |
856a6f1d | 321 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
322 | } |
323 | ||
324 | /* | |
325 | * Is there such a device as 'old' ? | |
326 | */ | |
856a6f1d | 327 | hc = __get_name_cell(param->name); |
1da177e4 | 328 | if (!hc) { |
856a6f1d PR |
329 | DMWARN("asked to rename a non-existent device %s -> %s", |
330 | param->name, new); | |
1da177e4 LT |
331 | up_write(&_hash_lock); |
332 | kfree(new_name); | |
856a6f1d | 333 | return ERR_PTR(-ENXIO); |
1da177e4 LT |
334 | } |
335 | ||
336 | /* | |
337 | * rename and move the name cell. | |
338 | */ | |
1da177e4 LT |
339 | list_del(&hc->name_list); |
340 | old_name = hc->name; | |
6076905b | 341 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 342 | hc->name = new_name; |
6076905b | 343 | mutex_unlock(&dm_hash_cells_mutex); |
1da177e4 LT |
344 | list_add(&hc->name_list, _name_buckets + hash_str(new_name)); |
345 | ||
81f1777a | 346 | /* |
347 | * Wake up any dm event waiters. | |
348 | */ | |
7c666411 | 349 | table = dm_get_live_table(hc->md); |
81f1777a | 350 | if (table) { |
351 | dm_table_event(table); | |
352 | dm_table_put(table); | |
353 | } | |
354 | ||
856a6f1d PR |
355 | if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, param->event_nr)) |
356 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
69267a30 | 357 | |
856a6f1d | 358 | md = hc->md; |
1da177e4 LT |
359 | up_write(&_hash_lock); |
360 | kfree(old_name); | |
856a6f1d PR |
361 | |
362 | return md; | |
1da177e4 LT |
363 | } |
364 | ||
365 | /*----------------------------------------------------------------- | |
366 | * Implementation of the ioctl commands | |
367 | *---------------------------------------------------------------*/ | |
368 | /* | |
369 | * All the ioctl commands get dispatched to functions with this | |
370 | * prototype. | |
371 | */ | |
372 | typedef int (*ioctl_fn)(struct dm_ioctl *param, size_t param_size); | |
373 | ||
374 | static int remove_all(struct dm_ioctl *param, size_t param_size) | |
375 | { | |
5c6bd75d | 376 | dm_hash_remove_all(1); |
1da177e4 LT |
377 | param->data_size = 0; |
378 | return 0; | |
379 | } | |
380 | ||
381 | /* | |
382 | * Round up the ptr to an 8-byte boundary. | |
383 | */ | |
384 | #define ALIGN_MASK 7 | |
385 | static inline void *align_ptr(void *ptr) | |
386 | { | |
387 | return (void *) (((size_t) (ptr + ALIGN_MASK)) & ~ALIGN_MASK); | |
388 | } | |
389 | ||
390 | /* | |
391 | * Retrieves the data payload buffer from an already allocated | |
392 | * struct dm_ioctl. | |
393 | */ | |
394 | static void *get_result_buffer(struct dm_ioctl *param, size_t param_size, | |
395 | size_t *len) | |
396 | { | |
397 | param->data_start = align_ptr(param + 1) - (void *) param; | |
398 | ||
399 | if (param->data_start < param_size) | |
400 | *len = param_size - param->data_start; | |
401 | else | |
402 | *len = 0; | |
403 | ||
404 | return ((void *) param) + param->data_start; | |
405 | } | |
406 | ||
407 | static int list_devices(struct dm_ioctl *param, size_t param_size) | |
408 | { | |
409 | unsigned int i; | |
410 | struct hash_cell *hc; | |
411 | size_t len, needed = 0; | |
412 | struct gendisk *disk; | |
413 | struct dm_name_list *nl, *old_nl = NULL; | |
414 | ||
415 | down_write(&_hash_lock); | |
416 | ||
417 | /* | |
418 | * Loop through all the devices working out how much | |
419 | * space we need. | |
420 | */ | |
421 | for (i = 0; i < NUM_BUCKETS; i++) { | |
422 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
423 | needed += sizeof(struct dm_name_list); | |
424 | needed += strlen(hc->name) + 1; | |
425 | needed += ALIGN_MASK; | |
426 | } | |
427 | } | |
428 | ||
429 | /* | |
430 | * Grab our output buffer. | |
431 | */ | |
432 | nl = get_result_buffer(param, param_size, &len); | |
433 | if (len < needed) { | |
434 | param->flags |= DM_BUFFER_FULL_FLAG; | |
435 | goto out; | |
436 | } | |
437 | param->data_size = param->data_start + needed; | |
438 | ||
439 | nl->dev = 0; /* Flags no data */ | |
440 | ||
441 | /* | |
442 | * Now loop through filling out the names. | |
443 | */ | |
444 | for (i = 0; i < NUM_BUCKETS; i++) { | |
445 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
446 | if (old_nl) | |
447 | old_nl->next = (uint32_t) ((void *) nl - | |
448 | (void *) old_nl); | |
449 | disk = dm_disk(hc->md); | |
f331c029 | 450 | nl->dev = huge_encode_dev(disk_devt(disk)); |
1da177e4 LT |
451 | nl->next = 0; |
452 | strcpy(nl->name, hc->name); | |
453 | ||
454 | old_nl = nl; | |
455 | nl = align_ptr(((void *) ++nl) + strlen(hc->name) + 1); | |
456 | } | |
457 | } | |
458 | ||
459 | out: | |
460 | up_write(&_hash_lock); | |
461 | return 0; | |
462 | } | |
463 | ||
464 | static void list_version_get_needed(struct target_type *tt, void *needed_param) | |
465 | { | |
466 | size_t *needed = needed_param; | |
467 | ||
c4cc6635 | 468 | *needed += sizeof(struct dm_target_versions); |
1da177e4 | 469 | *needed += strlen(tt->name); |
1da177e4 LT |
470 | *needed += ALIGN_MASK; |
471 | } | |
472 | ||
473 | static void list_version_get_info(struct target_type *tt, void *param) | |
474 | { | |
475 | struct vers_iter *info = param; | |
476 | ||
477 | /* Check space - it might have changed since the first iteration */ | |
478 | if ((char *)info->vers + sizeof(tt->version) + strlen(tt->name) + 1 > | |
479 | info->end) { | |
480 | ||
481 | info->flags = DM_BUFFER_FULL_FLAG; | |
482 | return; | |
483 | } | |
484 | ||
485 | if (info->old_vers) | |
486 | info->old_vers->next = (uint32_t) ((void *)info->vers - | |
487 | (void *)info->old_vers); | |
488 | info->vers->version[0] = tt->version[0]; | |
489 | info->vers->version[1] = tt->version[1]; | |
490 | info->vers->version[2] = tt->version[2]; | |
491 | info->vers->next = 0; | |
492 | strcpy(info->vers->name, tt->name); | |
493 | ||
494 | info->old_vers = info->vers; | |
495 | info->vers = align_ptr(((void *) ++info->vers) + strlen(tt->name) + 1); | |
496 | } | |
497 | ||
498 | static int list_versions(struct dm_ioctl *param, size_t param_size) | |
499 | { | |
500 | size_t len, needed = 0; | |
501 | struct dm_target_versions *vers; | |
502 | struct vers_iter iter_info; | |
503 | ||
504 | /* | |
505 | * Loop through all the devices working out how much | |
506 | * space we need. | |
507 | */ | |
508 | dm_target_iterate(list_version_get_needed, &needed); | |
509 | ||
510 | /* | |
511 | * Grab our output buffer. | |
512 | */ | |
513 | vers = get_result_buffer(param, param_size, &len); | |
514 | if (len < needed) { | |
515 | param->flags |= DM_BUFFER_FULL_FLAG; | |
516 | goto out; | |
517 | } | |
518 | param->data_size = param->data_start + needed; | |
519 | ||
520 | iter_info.param_size = param_size; | |
521 | iter_info.old_vers = NULL; | |
522 | iter_info.vers = vers; | |
523 | iter_info.flags = 0; | |
524 | iter_info.end = (char *)vers+len; | |
525 | ||
526 | /* | |
527 | * Now loop through filling out the names & versions. | |
528 | */ | |
529 | dm_target_iterate(list_version_get_info, &iter_info); | |
530 | param->flags |= iter_info.flags; | |
531 | ||
532 | out: | |
533 | return 0; | |
534 | } | |
535 | ||
1da177e4 LT |
536 | static int check_name(const char *name) |
537 | { | |
538 | if (strchr(name, '/')) { | |
539 | DMWARN("invalid device name"); | |
540 | return -EINVAL; | |
541 | } | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
1d0f3ce8 MS |
546 | /* |
547 | * On successful return, the caller must not attempt to acquire | |
548 | * _hash_lock without first calling dm_table_put, because dm_table_destroy | |
549 | * waits for this dm_table_put and could be called under this lock. | |
550 | */ | |
551 | static struct dm_table *dm_get_inactive_table(struct mapped_device *md) | |
552 | { | |
553 | struct hash_cell *hc; | |
554 | struct dm_table *table = NULL; | |
555 | ||
556 | down_read(&_hash_lock); | |
557 | hc = dm_get_mdptr(md); | |
558 | if (!hc || hc->md != md) { | |
559 | DMWARN("device has been removed from the dev hash table."); | |
560 | goto out; | |
561 | } | |
562 | ||
563 | table = hc->new_map; | |
564 | if (table) | |
565 | dm_table_get(table); | |
566 | ||
567 | out: | |
568 | up_read(&_hash_lock); | |
569 | ||
570 | return table; | |
571 | } | |
572 | ||
573 | static struct dm_table *dm_get_live_or_inactive_table(struct mapped_device *md, | |
574 | struct dm_ioctl *param) | |
575 | { | |
576 | return (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) ? | |
577 | dm_get_inactive_table(md) : dm_get_live_table(md); | |
578 | } | |
579 | ||
1da177e4 LT |
580 | /* |
581 | * Fills in a dm_ioctl structure, ready for sending back to | |
582 | * userland. | |
583 | */ | |
094ea9a0 | 584 | static void __dev_status(struct mapped_device *md, struct dm_ioctl *param) |
1da177e4 LT |
585 | { |
586 | struct gendisk *disk = dm_disk(md); | |
587 | struct dm_table *table; | |
1da177e4 LT |
588 | |
589 | param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG | | |
590 | DM_ACTIVE_PRESENT_FLAG); | |
591 | ||
4f186f8b | 592 | if (dm_suspended_md(md)) |
1da177e4 LT |
593 | param->flags |= DM_SUSPEND_FLAG; |
594 | ||
f331c029 | 595 | param->dev = huge_encode_dev(disk_devt(disk)); |
1da177e4 | 596 | |
5c6bd75d AK |
597 | /* |
598 | * Yes, this will be out of date by the time it gets back | |
599 | * to userland, but it is still very useful for | |
600 | * debugging. | |
601 | */ | |
602 | param->open_count = dm_open_count(md); | |
1da177e4 | 603 | |
1da177e4 | 604 | param->event_nr = dm_get_event_nr(md); |
1d0f3ce8 | 605 | param->target_count = 0; |
1da177e4 | 606 | |
7c666411 | 607 | table = dm_get_live_table(md); |
1da177e4 | 608 | if (table) { |
1d0f3ce8 MS |
609 | if (!(param->flags & DM_QUERY_INACTIVE_TABLE_FLAG)) { |
610 | if (get_disk_ro(disk)) | |
611 | param->flags |= DM_READONLY_FLAG; | |
612 | param->target_count = dm_table_get_num_targets(table); | |
613 | } | |
1da177e4 | 614 | dm_table_put(table); |
1d0f3ce8 MS |
615 | |
616 | param->flags |= DM_ACTIVE_PRESENT_FLAG; | |
617 | } | |
618 | ||
619 | if (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) { | |
620 | table = dm_get_inactive_table(md); | |
621 | if (table) { | |
622 | if (!(dm_table_get_mode(table) & FMODE_WRITE)) | |
623 | param->flags |= DM_READONLY_FLAG; | |
624 | param->target_count = dm_table_get_num_targets(table); | |
625 | dm_table_put(table); | |
626 | } | |
627 | } | |
1da177e4 LT |
628 | } |
629 | ||
630 | static int dev_create(struct dm_ioctl *param, size_t param_size) | |
631 | { | |
2b06cfff | 632 | int r, m = DM_ANY_MINOR; |
1da177e4 LT |
633 | struct mapped_device *md; |
634 | ||
635 | r = check_name(param->name); | |
636 | if (r) | |
637 | return r; | |
638 | ||
639 | if (param->flags & DM_PERSISTENT_DEV_FLAG) | |
2b06cfff | 640 | m = MINOR(huge_decode_dev(param->dev)); |
1da177e4 | 641 | |
2b06cfff | 642 | r = dm_create(m, &md); |
1da177e4 LT |
643 | if (r) |
644 | return r; | |
645 | ||
646 | r = dm_hash_insert(param->name, *param->uuid ? param->uuid : NULL, md); | |
094ea9a0 AK |
647 | if (r) |
648 | goto out; | |
1da177e4 LT |
649 | |
650 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
651 | ||
094ea9a0 AK |
652 | __dev_status(md, param); |
653 | ||
654 | out: | |
1da177e4 LT |
655 | dm_put(md); |
656 | ||
657 | return r; | |
658 | } | |
659 | ||
660 | /* | |
661 | * Always use UUID for lookups if it's present, otherwise use name or dev. | |
662 | */ | |
858119e1 | 663 | static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) |
1da177e4 | 664 | { |
9ade92a9 AK |
665 | struct mapped_device *md; |
666 | void *mdptr = NULL; | |
667 | ||
1da177e4 LT |
668 | if (*param->uuid) |
669 | return __get_uuid_cell(param->uuid); | |
9ade92a9 AK |
670 | |
671 | if (*param->name) | |
1da177e4 | 672 | return __get_name_cell(param->name); |
9ade92a9 AK |
673 | |
674 | md = dm_get_md(huge_decode_dev(param->dev)); | |
bfc5ecdf AK |
675 | if (!md) |
676 | goto out; | |
677 | ||
678 | mdptr = dm_get_mdptr(md); | |
679 | if (!mdptr) | |
680 | dm_put(md); | |
9ade92a9 | 681 | |
bfc5ecdf | 682 | out: |
9ade92a9 | 683 | return mdptr; |
1da177e4 LT |
684 | } |
685 | ||
858119e1 | 686 | static struct mapped_device *find_device(struct dm_ioctl *param) |
1da177e4 LT |
687 | { |
688 | struct hash_cell *hc; | |
689 | struct mapped_device *md = NULL; | |
690 | ||
691 | down_read(&_hash_lock); | |
692 | hc = __find_device_hash_cell(param); | |
693 | if (hc) { | |
694 | md = hc->md; | |
1da177e4 LT |
695 | |
696 | /* | |
697 | * Sneakily write in both the name and the uuid | |
698 | * while we have the cell. | |
699 | */ | |
a518b86d | 700 | strlcpy(param->name, hc->name, sizeof(param->name)); |
1da177e4 | 701 | if (hc->uuid) |
a518b86d | 702 | strlcpy(param->uuid, hc->uuid, sizeof(param->uuid)); |
1da177e4 LT |
703 | else |
704 | param->uuid[0] = '\0'; | |
705 | ||
706 | if (hc->new_map) | |
707 | param->flags |= DM_INACTIVE_PRESENT_FLAG; | |
708 | else | |
709 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
710 | } | |
711 | up_read(&_hash_lock); | |
712 | ||
713 | return md; | |
714 | } | |
715 | ||
716 | static int dev_remove(struct dm_ioctl *param, size_t param_size) | |
717 | { | |
718 | struct hash_cell *hc; | |
7ec75f25 | 719 | struct mapped_device *md; |
5c6bd75d | 720 | int r; |
1da177e4 LT |
721 | |
722 | down_write(&_hash_lock); | |
723 | hc = __find_device_hash_cell(param); | |
724 | ||
725 | if (!hc) { | |
726 | DMWARN("device doesn't appear to be in the dev hash table."); | |
727 | up_write(&_hash_lock); | |
728 | return -ENXIO; | |
729 | } | |
730 | ||
7ec75f25 JM |
731 | md = hc->md; |
732 | ||
5c6bd75d AK |
733 | /* |
734 | * Ensure the device is not open and nothing further can open it. | |
735 | */ | |
736 | r = dm_lock_for_deletion(md); | |
737 | if (r) { | |
738 | DMWARN("unable to remove open device %s", hc->name); | |
739 | up_write(&_hash_lock); | |
740 | dm_put(md); | |
741 | return r; | |
742 | } | |
743 | ||
1da177e4 LT |
744 | __hash_remove(hc); |
745 | up_write(&_hash_lock); | |
60935eb2 | 746 | |
3abf85b5 PR |
747 | if (!dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr)) |
748 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
60935eb2 | 749 | |
7ec75f25 | 750 | dm_put(md); |
1da177e4 LT |
751 | return 0; |
752 | } | |
753 | ||
754 | /* | |
755 | * Check a string doesn't overrun the chunk of | |
756 | * memory we copied from userland. | |
757 | */ | |
758 | static int invalid_str(char *str, void *end) | |
759 | { | |
760 | while ((void *) str < end) | |
761 | if (!*str++) | |
762 | return 0; | |
763 | ||
764 | return -EINVAL; | |
765 | } | |
766 | ||
767 | static int dev_rename(struct dm_ioctl *param, size_t param_size) | |
768 | { | |
769 | int r; | |
770 | char *new_name = (char *) param + param->data_start; | |
856a6f1d | 771 | struct mapped_device *md; |
1da177e4 | 772 | |
27238b2b | 773 | if (new_name < param->data || |
bc0fd67f MB |
774 | invalid_str(new_name, (void *) param + param_size) || |
775 | strlen(new_name) > DM_NAME_LEN - 1) { | |
1da177e4 LT |
776 | DMWARN("Invalid new logical volume name supplied."); |
777 | return -EINVAL; | |
778 | } | |
779 | ||
780 | r = check_name(new_name); | |
781 | if (r) | |
782 | return r; | |
783 | ||
856a6f1d PR |
784 | md = dm_hash_rename(param, new_name); |
785 | if (IS_ERR(md)) | |
786 | return PTR_ERR(md); | |
3abf85b5 | 787 | |
856a6f1d PR |
788 | __dev_status(md, param); |
789 | dm_put(md); | |
790 | ||
791 | return 0; | |
1da177e4 LT |
792 | } |
793 | ||
3ac51e74 DW |
794 | static int dev_set_geometry(struct dm_ioctl *param, size_t param_size) |
795 | { | |
796 | int r = -EINVAL, x; | |
797 | struct mapped_device *md; | |
798 | struct hd_geometry geometry; | |
799 | unsigned long indata[4]; | |
800 | char *geostr = (char *) param + param->data_start; | |
801 | ||
802 | md = find_device(param); | |
803 | if (!md) | |
804 | return -ENXIO; | |
805 | ||
27238b2b | 806 | if (geostr < param->data || |
3ac51e74 DW |
807 | invalid_str(geostr, (void *) param + param_size)) { |
808 | DMWARN("Invalid geometry supplied."); | |
809 | goto out; | |
810 | } | |
811 | ||
812 | x = sscanf(geostr, "%lu %lu %lu %lu", indata, | |
813 | indata + 1, indata + 2, indata + 3); | |
814 | ||
815 | if (x != 4) { | |
816 | DMWARN("Unable to interpret geometry settings."); | |
817 | goto out; | |
818 | } | |
819 | ||
820 | if (indata[0] > 65535 || indata[1] > 255 || | |
821 | indata[2] > 255 || indata[3] > ULONG_MAX) { | |
822 | DMWARN("Geometry exceeds range limits."); | |
823 | goto out; | |
824 | } | |
825 | ||
826 | geometry.cylinders = indata[0]; | |
827 | geometry.heads = indata[1]; | |
828 | geometry.sectors = indata[2]; | |
829 | geometry.start = indata[3]; | |
830 | ||
831 | r = dm_set_geometry(md, &geometry); | |
3ac51e74 DW |
832 | |
833 | param->data_size = 0; | |
834 | ||
835 | out: | |
836 | dm_put(md); | |
837 | return r; | |
838 | } | |
839 | ||
1da177e4 LT |
840 | static int do_suspend(struct dm_ioctl *param) |
841 | { | |
842 | int r = 0; | |
a3d77d35 | 843 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
844 | struct mapped_device *md; |
845 | ||
846 | md = find_device(param); | |
847 | if (!md) | |
848 | return -ENXIO; | |
849 | ||
6da487dc | 850 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 851 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
852 | if (param->flags & DM_NOFLUSH_FLAG) |
853 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
6da487dc | 854 | |
094ea9a0 | 855 | if (!dm_suspended_md(md)) { |
a3d77d35 | 856 | r = dm_suspend(md, suspend_flags); |
094ea9a0 AK |
857 | if (r) |
858 | goto out; | |
859 | } | |
1da177e4 | 860 | |
094ea9a0 | 861 | __dev_status(md, param); |
1da177e4 | 862 | |
094ea9a0 | 863 | out: |
1da177e4 | 864 | dm_put(md); |
094ea9a0 | 865 | |
1da177e4 LT |
866 | return r; |
867 | } | |
868 | ||
869 | static int do_resume(struct dm_ioctl *param) | |
870 | { | |
871 | int r = 0; | |
a3d77d35 | 872 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
873 | struct hash_cell *hc; |
874 | struct mapped_device *md; | |
042d2a9b | 875 | struct dm_table *new_map, *old_map = NULL; |
1da177e4 LT |
876 | |
877 | down_write(&_hash_lock); | |
878 | ||
879 | hc = __find_device_hash_cell(param); | |
880 | if (!hc) { | |
881 | DMWARN("device doesn't appear to be in the dev hash table."); | |
882 | up_write(&_hash_lock); | |
883 | return -ENXIO; | |
884 | } | |
885 | ||
886 | md = hc->md; | |
1da177e4 LT |
887 | |
888 | new_map = hc->new_map; | |
889 | hc->new_map = NULL; | |
890 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
891 | ||
892 | up_write(&_hash_lock); | |
893 | ||
894 | /* Do we need to load a new map ? */ | |
895 | if (new_map) { | |
896 | /* Suspend if it isn't already suspended */ | |
6da487dc | 897 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 898 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
899 | if (param->flags & DM_NOFLUSH_FLAG) |
900 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
4f186f8b | 901 | if (!dm_suspended_md(md)) |
a3d77d35 | 902 | dm_suspend(md, suspend_flags); |
1da177e4 | 903 | |
042d2a9b AK |
904 | old_map = dm_swap_table(md, new_map); |
905 | if (IS_ERR(old_map)) { | |
d5816876 | 906 | dm_table_destroy(new_map); |
1da177e4 | 907 | dm_put(md); |
042d2a9b | 908 | return PTR_ERR(old_map); |
1da177e4 LT |
909 | } |
910 | ||
911 | if (dm_table_get_mode(new_map) & FMODE_WRITE) | |
912 | set_disk_ro(dm_disk(md), 0); | |
913 | else | |
914 | set_disk_ro(dm_disk(md), 1); | |
1da177e4 LT |
915 | } |
916 | ||
0f3649a9 | 917 | if (dm_suspended_md(md)) { |
1da177e4 | 918 | r = dm_resume(md); |
3abf85b5 PR |
919 | if (!r && !dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr)) |
920 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
0f3649a9 | 921 | } |
1da177e4 | 922 | |
042d2a9b AK |
923 | if (old_map) |
924 | dm_table_destroy(old_map); | |
60935eb2 | 925 | |
0f3649a9 | 926 | if (!r) |
094ea9a0 | 927 | __dev_status(md, param); |
1da177e4 LT |
928 | |
929 | dm_put(md); | |
930 | return r; | |
931 | } | |
932 | ||
933 | /* | |
934 | * Set or unset the suspension state of a device. | |
935 | * If the device already is in the requested state we just return its status. | |
936 | */ | |
937 | static int dev_suspend(struct dm_ioctl *param, size_t param_size) | |
938 | { | |
939 | if (param->flags & DM_SUSPEND_FLAG) | |
940 | return do_suspend(param); | |
941 | ||
942 | return do_resume(param); | |
943 | } | |
944 | ||
945 | /* | |
946 | * Copies device info back to user space, used by | |
947 | * the create and info ioctls. | |
948 | */ | |
949 | static int dev_status(struct dm_ioctl *param, size_t param_size) | |
950 | { | |
1da177e4 LT |
951 | struct mapped_device *md; |
952 | ||
953 | md = find_device(param); | |
954 | if (!md) | |
955 | return -ENXIO; | |
956 | ||
094ea9a0 | 957 | __dev_status(md, param); |
1da177e4 | 958 | dm_put(md); |
094ea9a0 AK |
959 | |
960 | return 0; | |
1da177e4 LT |
961 | } |
962 | ||
963 | /* | |
964 | * Build up the status struct for each target | |
965 | */ | |
966 | static void retrieve_status(struct dm_table *table, | |
967 | struct dm_ioctl *param, size_t param_size) | |
968 | { | |
969 | unsigned int i, num_targets; | |
970 | struct dm_target_spec *spec; | |
971 | char *outbuf, *outptr; | |
972 | status_type_t type; | |
973 | size_t remaining, len, used = 0; | |
974 | ||
975 | outptr = outbuf = get_result_buffer(param, param_size, &len); | |
976 | ||
977 | if (param->flags & DM_STATUS_TABLE_FLAG) | |
978 | type = STATUSTYPE_TABLE; | |
979 | else | |
980 | type = STATUSTYPE_INFO; | |
981 | ||
982 | /* Get all the target info */ | |
983 | num_targets = dm_table_get_num_targets(table); | |
984 | for (i = 0; i < num_targets; i++) { | |
985 | struct dm_target *ti = dm_table_get_target(table, i); | |
986 | ||
987 | remaining = len - (outptr - outbuf); | |
988 | if (remaining <= sizeof(struct dm_target_spec)) { | |
989 | param->flags |= DM_BUFFER_FULL_FLAG; | |
990 | break; | |
991 | } | |
992 | ||
993 | spec = (struct dm_target_spec *) outptr; | |
994 | ||
995 | spec->status = 0; | |
996 | spec->sector_start = ti->begin; | |
997 | spec->length = ti->len; | |
998 | strncpy(spec->target_type, ti->type->name, | |
999 | sizeof(spec->target_type)); | |
1000 | ||
1001 | outptr += sizeof(struct dm_target_spec); | |
1002 | remaining = len - (outptr - outbuf); | |
1003 | if (remaining <= 0) { | |
1004 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1005 | break; | |
1006 | } | |
1007 | ||
1008 | /* Get the status/table string from the target driver */ | |
1009 | if (ti->type->status) { | |
1010 | if (ti->type->status(ti, type, outptr, remaining)) { | |
1011 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1012 | break; | |
1013 | } | |
1014 | } else | |
1015 | outptr[0] = '\0'; | |
1016 | ||
1017 | outptr += strlen(outptr) + 1; | |
1018 | used = param->data_start + (outptr - outbuf); | |
1019 | ||
1020 | outptr = align_ptr(outptr); | |
1021 | spec->next = outptr - outbuf; | |
1022 | } | |
1023 | ||
1024 | if (used) | |
1025 | param->data_size = used; | |
1026 | ||
1027 | param->target_count = num_targets; | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Wait for a device to report an event | |
1032 | */ | |
1033 | static int dev_wait(struct dm_ioctl *param, size_t param_size) | |
1034 | { | |
094ea9a0 | 1035 | int r = 0; |
1da177e4 LT |
1036 | struct mapped_device *md; |
1037 | struct dm_table *table; | |
1038 | ||
1039 | md = find_device(param); | |
1040 | if (!md) | |
1041 | return -ENXIO; | |
1042 | ||
1043 | /* | |
1044 | * Wait for a notification event | |
1045 | */ | |
1046 | if (dm_wait_event(md, param->event_nr)) { | |
1047 | r = -ERESTARTSYS; | |
1048 | goto out; | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * The userland program is going to want to know what | |
1053 | * changed to trigger the event, so we may as well tell | |
1054 | * him and save an ioctl. | |
1055 | */ | |
094ea9a0 | 1056 | __dev_status(md, param); |
1da177e4 | 1057 | |
1d0f3ce8 | 1058 | table = dm_get_live_or_inactive_table(md, param); |
1da177e4 LT |
1059 | if (table) { |
1060 | retrieve_status(table, param, param_size); | |
1061 | dm_table_put(table); | |
1062 | } | |
1063 | ||
094ea9a0 | 1064 | out: |
1da177e4 | 1065 | dm_put(md); |
094ea9a0 | 1066 | |
1da177e4 LT |
1067 | return r; |
1068 | } | |
1069 | ||
aeb5d727 | 1070 | static inline fmode_t get_mode(struct dm_ioctl *param) |
1da177e4 | 1071 | { |
aeb5d727 | 1072 | fmode_t mode = FMODE_READ | FMODE_WRITE; |
1da177e4 LT |
1073 | |
1074 | if (param->flags & DM_READONLY_FLAG) | |
1075 | mode = FMODE_READ; | |
1076 | ||
1077 | return mode; | |
1078 | } | |
1079 | ||
1080 | static int next_target(struct dm_target_spec *last, uint32_t next, void *end, | |
1081 | struct dm_target_spec **spec, char **target_params) | |
1082 | { | |
1083 | *spec = (struct dm_target_spec *) ((unsigned char *) last + next); | |
1084 | *target_params = (char *) (*spec + 1); | |
1085 | ||
1086 | if (*spec < (last + 1)) | |
1087 | return -EINVAL; | |
1088 | ||
1089 | return invalid_str(*target_params, end); | |
1090 | } | |
1091 | ||
1092 | static int populate_table(struct dm_table *table, | |
1093 | struct dm_ioctl *param, size_t param_size) | |
1094 | { | |
1095 | int r; | |
1096 | unsigned int i = 0; | |
1097 | struct dm_target_spec *spec = (struct dm_target_spec *) param; | |
1098 | uint32_t next = param->data_start; | |
1099 | void *end = (void *) param + param_size; | |
1100 | char *target_params; | |
1101 | ||
1102 | if (!param->target_count) { | |
1103 | DMWARN("populate_table: no targets specified"); | |
1104 | return -EINVAL; | |
1105 | } | |
1106 | ||
1107 | for (i = 0; i < param->target_count; i++) { | |
1108 | ||
1109 | r = next_target(spec, next, end, &spec, &target_params); | |
1110 | if (r) { | |
1111 | DMWARN("unable to find target"); | |
1112 | return r; | |
1113 | } | |
1114 | ||
1115 | r = dm_table_add_target(table, spec->target_type, | |
1116 | (sector_t) spec->sector_start, | |
1117 | (sector_t) spec->length, | |
1118 | target_params); | |
1119 | if (r) { | |
1120 | DMWARN("error adding target to table"); | |
1121 | return r; | |
1122 | } | |
1123 | ||
1124 | next = spec->next; | |
1125 | } | |
1126 | ||
e6ee8c0b KU |
1127 | r = dm_table_set_type(table); |
1128 | if (r) { | |
1129 | DMWARN("unable to set table type"); | |
1130 | return r; | |
1131 | } | |
1132 | ||
1da177e4 LT |
1133 | return dm_table_complete(table); |
1134 | } | |
1135 | ||
9c47008d MP |
1136 | static int table_prealloc_integrity(struct dm_table *t, |
1137 | struct mapped_device *md) | |
1138 | { | |
1139 | struct list_head *devices = dm_table_get_devices(t); | |
1140 | struct dm_dev_internal *dd; | |
1141 | ||
1142 | list_for_each_entry(dd, devices, list) | |
1143 | if (bdev_get_integrity(dd->dm_dev.bdev)) | |
1144 | return blk_integrity_register(dm_disk(md), NULL); | |
1145 | ||
1146 | return 0; | |
1147 | } | |
1148 | ||
1da177e4 LT |
1149 | static int table_load(struct dm_ioctl *param, size_t param_size) |
1150 | { | |
1151 | int r; | |
1152 | struct hash_cell *hc; | |
1153 | struct dm_table *t; | |
1134e5ae MA |
1154 | struct mapped_device *md; |
1155 | ||
1156 | md = find_device(param); | |
1157 | if (!md) | |
1158 | return -ENXIO; | |
1da177e4 | 1159 | |
1134e5ae | 1160 | r = dm_table_create(&t, get_mode(param), param->target_count, md); |
1da177e4 | 1161 | if (r) |
1134e5ae | 1162 | goto out; |
1da177e4 LT |
1163 | |
1164 | r = populate_table(t, param, param_size); | |
1165 | if (r) { | |
f80a5570 | 1166 | dm_table_destroy(t); |
1134e5ae | 1167 | goto out; |
1da177e4 LT |
1168 | } |
1169 | ||
9c47008d MP |
1170 | r = table_prealloc_integrity(t, md); |
1171 | if (r) { | |
1172 | DMERR("%s: could not register integrity profile.", | |
1173 | dm_device_name(md)); | |
1174 | dm_table_destroy(t); | |
1175 | goto out; | |
1176 | } | |
1177 | ||
e6ee8c0b KU |
1178 | r = dm_table_alloc_md_mempools(t); |
1179 | if (r) { | |
1180 | DMWARN("unable to allocate mempools for this table"); | |
1181 | dm_table_destroy(t); | |
1182 | goto out; | |
1183 | } | |
1184 | ||
1da177e4 | 1185 | down_write(&_hash_lock); |
1134e5ae MA |
1186 | hc = dm_get_mdptr(md); |
1187 | if (!hc || hc->md != md) { | |
1188 | DMWARN("device has been removed from the dev hash table."); | |
f80a5570 | 1189 | dm_table_destroy(t); |
1134e5ae MA |
1190 | up_write(&_hash_lock); |
1191 | r = -ENXIO; | |
1192 | goto out; | |
1da177e4 LT |
1193 | } |
1194 | ||
1195 | if (hc->new_map) | |
d5816876 | 1196 | dm_table_destroy(hc->new_map); |
1da177e4 | 1197 | hc->new_map = t; |
1134e5ae MA |
1198 | up_write(&_hash_lock); |
1199 | ||
1da177e4 | 1200 | param->flags |= DM_INACTIVE_PRESENT_FLAG; |
094ea9a0 | 1201 | __dev_status(md, param); |
1134e5ae MA |
1202 | |
1203 | out: | |
1204 | dm_put(md); | |
1da177e4 | 1205 | |
1da177e4 LT |
1206 | return r; |
1207 | } | |
1208 | ||
1209 | static int table_clear(struct dm_ioctl *param, size_t param_size) | |
1210 | { | |
1da177e4 | 1211 | struct hash_cell *hc; |
7ec75f25 | 1212 | struct mapped_device *md; |
1da177e4 LT |
1213 | |
1214 | down_write(&_hash_lock); | |
1215 | ||
1216 | hc = __find_device_hash_cell(param); | |
1217 | if (!hc) { | |
1218 | DMWARN("device doesn't appear to be in the dev hash table."); | |
1219 | up_write(&_hash_lock); | |
1220 | return -ENXIO; | |
1221 | } | |
1222 | ||
1223 | if (hc->new_map) { | |
d5816876 | 1224 | dm_table_destroy(hc->new_map); |
1da177e4 LT |
1225 | hc->new_map = NULL; |
1226 | } | |
1227 | ||
1228 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
1229 | ||
094ea9a0 | 1230 | __dev_status(hc->md, param); |
7ec75f25 | 1231 | md = hc->md; |
1da177e4 | 1232 | up_write(&_hash_lock); |
7ec75f25 | 1233 | dm_put(md); |
094ea9a0 AK |
1234 | |
1235 | return 0; | |
1da177e4 LT |
1236 | } |
1237 | ||
1238 | /* | |
1239 | * Retrieves a list of devices used by a particular dm device. | |
1240 | */ | |
1241 | static void retrieve_deps(struct dm_table *table, | |
1242 | struct dm_ioctl *param, size_t param_size) | |
1243 | { | |
1244 | unsigned int count = 0; | |
1245 | struct list_head *tmp; | |
1246 | size_t len, needed; | |
82b1519b | 1247 | struct dm_dev_internal *dd; |
1da177e4 LT |
1248 | struct dm_target_deps *deps; |
1249 | ||
1250 | deps = get_result_buffer(param, param_size, &len); | |
1251 | ||
1252 | /* | |
1253 | * Count the devices. | |
1254 | */ | |
1255 | list_for_each (tmp, dm_table_get_devices(table)) | |
1256 | count++; | |
1257 | ||
1258 | /* | |
1259 | * Check we have enough space. | |
1260 | */ | |
1261 | needed = sizeof(*deps) + (sizeof(*deps->dev) * count); | |
1262 | if (len < needed) { | |
1263 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1264 | return; | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * Fill in the devices. | |
1269 | */ | |
1270 | deps->count = count; | |
1271 | count = 0; | |
1272 | list_for_each_entry (dd, dm_table_get_devices(table), list) | |
82b1519b | 1273 | deps->dev[count++] = huge_encode_dev(dd->dm_dev.bdev->bd_dev); |
1da177e4 LT |
1274 | |
1275 | param->data_size = param->data_start + needed; | |
1276 | } | |
1277 | ||
1278 | static int table_deps(struct dm_ioctl *param, size_t param_size) | |
1279 | { | |
1da177e4 LT |
1280 | struct mapped_device *md; |
1281 | struct dm_table *table; | |
1282 | ||
1283 | md = find_device(param); | |
1284 | if (!md) | |
1285 | return -ENXIO; | |
1286 | ||
094ea9a0 | 1287 | __dev_status(md, param); |
1da177e4 | 1288 | |
1d0f3ce8 | 1289 | table = dm_get_live_or_inactive_table(md, param); |
1da177e4 LT |
1290 | if (table) { |
1291 | retrieve_deps(table, param, param_size); | |
1292 | dm_table_put(table); | |
1293 | } | |
1294 | ||
1da177e4 | 1295 | dm_put(md); |
094ea9a0 AK |
1296 | |
1297 | return 0; | |
1da177e4 LT |
1298 | } |
1299 | ||
1300 | /* | |
1301 | * Return the status of a device as a text string for each | |
1302 | * target. | |
1303 | */ | |
1304 | static int table_status(struct dm_ioctl *param, size_t param_size) | |
1305 | { | |
1da177e4 LT |
1306 | struct mapped_device *md; |
1307 | struct dm_table *table; | |
1308 | ||
1309 | md = find_device(param); | |
1310 | if (!md) | |
1311 | return -ENXIO; | |
1312 | ||
094ea9a0 | 1313 | __dev_status(md, param); |
1da177e4 | 1314 | |
1d0f3ce8 | 1315 | table = dm_get_live_or_inactive_table(md, param); |
1da177e4 LT |
1316 | if (table) { |
1317 | retrieve_status(table, param, param_size); | |
1318 | dm_table_put(table); | |
1319 | } | |
1320 | ||
1da177e4 | 1321 | dm_put(md); |
094ea9a0 AK |
1322 | |
1323 | return 0; | |
1da177e4 LT |
1324 | } |
1325 | ||
1326 | /* | |
1327 | * Pass a message to the target that's at the supplied device offset. | |
1328 | */ | |
1329 | static int target_message(struct dm_ioctl *param, size_t param_size) | |
1330 | { | |
1331 | int r, argc; | |
1332 | char **argv; | |
1333 | struct mapped_device *md; | |
1334 | struct dm_table *table; | |
1335 | struct dm_target *ti; | |
1336 | struct dm_target_msg *tmsg = (void *) param + param->data_start; | |
1337 | ||
1338 | md = find_device(param); | |
1339 | if (!md) | |
1340 | return -ENXIO; | |
1341 | ||
027d50f9 | 1342 | if (tmsg < (struct dm_target_msg *) param->data || |
1da177e4 LT |
1343 | invalid_str(tmsg->message, (void *) param + param_size)) { |
1344 | DMWARN("Invalid target message parameters."); | |
1345 | r = -EINVAL; | |
1346 | goto out; | |
1347 | } | |
1348 | ||
1349 | r = dm_split_args(&argc, &argv, tmsg->message); | |
1350 | if (r) { | |
1351 | DMWARN("Failed to split target message parameters"); | |
1352 | goto out; | |
1353 | } | |
1354 | ||
7c666411 | 1355 | table = dm_get_live_table(md); |
1da177e4 LT |
1356 | if (!table) |
1357 | goto out_argv; | |
1358 | ||
c50abeb3 MA |
1359 | if (dm_deleting_md(md)) { |
1360 | r = -ENXIO; | |
1361 | goto out_table; | |
1362 | } | |
1363 | ||
512875bd JN |
1364 | ti = dm_table_find_target(table, tmsg->sector); |
1365 | if (!dm_target_is_valid(ti)) { | |
1da177e4 LT |
1366 | DMWARN("Target message sector outside device."); |
1367 | r = -EINVAL; | |
512875bd | 1368 | } else if (ti->type->message) |
1da177e4 LT |
1369 | r = ti->type->message(ti, argc, argv); |
1370 | else { | |
1371 | DMWARN("Target type does not support messages"); | |
1372 | r = -EINVAL; | |
1373 | } | |
1374 | ||
c50abeb3 | 1375 | out_table: |
1da177e4 LT |
1376 | dm_table_put(table); |
1377 | out_argv: | |
1378 | kfree(argv); | |
1379 | out: | |
1380 | param->data_size = 0; | |
1381 | dm_put(md); | |
1382 | return r; | |
1383 | } | |
1384 | ||
1385 | /*----------------------------------------------------------------- | |
1386 | * Implementation of open/close/ioctl on the special char | |
1387 | * device. | |
1388 | *---------------------------------------------------------------*/ | |
1389 | static ioctl_fn lookup_ioctl(unsigned int cmd) | |
1390 | { | |
1391 | static struct { | |
1392 | int cmd; | |
1393 | ioctl_fn fn; | |
1394 | } _ioctls[] = { | |
1395 | {DM_VERSION_CMD, NULL}, /* version is dealt with elsewhere */ | |
1396 | {DM_REMOVE_ALL_CMD, remove_all}, | |
1397 | {DM_LIST_DEVICES_CMD, list_devices}, | |
1398 | ||
1399 | {DM_DEV_CREATE_CMD, dev_create}, | |
1400 | {DM_DEV_REMOVE_CMD, dev_remove}, | |
1401 | {DM_DEV_RENAME_CMD, dev_rename}, | |
1402 | {DM_DEV_SUSPEND_CMD, dev_suspend}, | |
1403 | {DM_DEV_STATUS_CMD, dev_status}, | |
1404 | {DM_DEV_WAIT_CMD, dev_wait}, | |
1405 | ||
1406 | {DM_TABLE_LOAD_CMD, table_load}, | |
1407 | {DM_TABLE_CLEAR_CMD, table_clear}, | |
1408 | {DM_TABLE_DEPS_CMD, table_deps}, | |
1409 | {DM_TABLE_STATUS_CMD, table_status}, | |
1410 | ||
1411 | {DM_LIST_VERSIONS_CMD, list_versions}, | |
1412 | ||
3ac51e74 DW |
1413 | {DM_TARGET_MSG_CMD, target_message}, |
1414 | {DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry} | |
1da177e4 LT |
1415 | }; |
1416 | ||
1417 | return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn; | |
1418 | } | |
1419 | ||
1420 | /* | |
1421 | * As well as checking the version compatibility this always | |
1422 | * copies the kernel interface version out. | |
1423 | */ | |
1424 | static int check_version(unsigned int cmd, struct dm_ioctl __user *user) | |
1425 | { | |
1426 | uint32_t version[3]; | |
1427 | int r = 0; | |
1428 | ||
1429 | if (copy_from_user(version, user->version, sizeof(version))) | |
1430 | return -EFAULT; | |
1431 | ||
1432 | if ((DM_VERSION_MAJOR != version[0]) || | |
1433 | (DM_VERSION_MINOR < version[1])) { | |
1434 | DMWARN("ioctl interface mismatch: " | |
1435 | "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)", | |
1436 | DM_VERSION_MAJOR, DM_VERSION_MINOR, | |
1437 | DM_VERSION_PATCHLEVEL, | |
1438 | version[0], version[1], version[2], cmd); | |
1439 | r = -EINVAL; | |
1440 | } | |
1441 | ||
1442 | /* | |
1443 | * Fill in the kernel version. | |
1444 | */ | |
1445 | version[0] = DM_VERSION_MAJOR; | |
1446 | version[1] = DM_VERSION_MINOR; | |
1447 | version[2] = DM_VERSION_PATCHLEVEL; | |
1448 | if (copy_to_user(user->version, version, sizeof(version))) | |
1449 | return -EFAULT; | |
1450 | ||
1451 | return r; | |
1452 | } | |
1453 | ||
1454 | static void free_params(struct dm_ioctl *param) | |
1455 | { | |
1456 | vfree(param); | |
1457 | } | |
1458 | ||
1459 | static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param) | |
1460 | { | |
1461 | struct dm_ioctl tmp, *dmi; | |
1462 | ||
76c072b4 | 1463 | if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data))) |
1da177e4 LT |
1464 | return -EFAULT; |
1465 | ||
76c072b4 | 1466 | if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data))) |
1da177e4 LT |
1467 | return -EINVAL; |
1468 | ||
bb56acf8 | 1469 | dmi = vmalloc(tmp.data_size); |
1da177e4 LT |
1470 | if (!dmi) |
1471 | return -ENOMEM; | |
1472 | ||
1473 | if (copy_from_user(dmi, user, tmp.data_size)) { | |
1474 | vfree(dmi); | |
1475 | return -EFAULT; | |
1476 | } | |
1477 | ||
1478 | *param = dmi; | |
1479 | return 0; | |
1480 | } | |
1481 | ||
1482 | static int validate_params(uint cmd, struct dm_ioctl *param) | |
1483 | { | |
1484 | /* Always clear this flag */ | |
1485 | param->flags &= ~DM_BUFFER_FULL_FLAG; | |
3abf85b5 | 1486 | param->flags &= ~DM_UEVENT_GENERATED_FLAG; |
1da177e4 LT |
1487 | |
1488 | /* Ignores parameters */ | |
1489 | if (cmd == DM_REMOVE_ALL_CMD || | |
1490 | cmd == DM_LIST_DEVICES_CMD || | |
1491 | cmd == DM_LIST_VERSIONS_CMD) | |
1492 | return 0; | |
1493 | ||
1494 | if ((cmd == DM_DEV_CREATE_CMD)) { | |
1495 | if (!*param->name) { | |
1496 | DMWARN("name not supplied when creating device"); | |
1497 | return -EINVAL; | |
1498 | } | |
1499 | } else if ((*param->uuid && *param->name)) { | |
1500 | DMWARN("only supply one of name or uuid, cmd(%u)", cmd); | |
1501 | return -EINVAL; | |
1502 | } | |
1503 | ||
1504 | /* Ensure strings are terminated */ | |
1505 | param->name[DM_NAME_LEN - 1] = '\0'; | |
1506 | param->uuid[DM_UUID_LEN - 1] = '\0'; | |
1507 | ||
1508 | return 0; | |
1509 | } | |
1510 | ||
27238b2b | 1511 | static int ctl_ioctl(uint command, struct dm_ioctl __user *user) |
1da177e4 LT |
1512 | { |
1513 | int r = 0; | |
1514 | unsigned int cmd; | |
a26ffd4a | 1515 | struct dm_ioctl *uninitialized_var(param); |
1da177e4 LT |
1516 | ioctl_fn fn = NULL; |
1517 | size_t param_size; | |
1518 | ||
1519 | /* only root can play with this */ | |
1520 | if (!capable(CAP_SYS_ADMIN)) | |
1521 | return -EACCES; | |
1522 | ||
1523 | if (_IOC_TYPE(command) != DM_IOCTL) | |
1524 | return -ENOTTY; | |
1525 | ||
1526 | cmd = _IOC_NR(command); | |
1527 | ||
1528 | /* | |
1529 | * Check the interface version passed in. This also | |
1530 | * writes out the kernel's interface version. | |
1531 | */ | |
1532 | r = check_version(cmd, user); | |
1533 | if (r) | |
1534 | return r; | |
1535 | ||
1536 | /* | |
1537 | * Nothing more to do for the version command. | |
1538 | */ | |
1539 | if (cmd == DM_VERSION_CMD) | |
1540 | return 0; | |
1541 | ||
1542 | fn = lookup_ioctl(cmd); | |
1543 | if (!fn) { | |
1544 | DMWARN("dm_ctl_ioctl: unknown command 0x%x", command); | |
1545 | return -ENOTTY; | |
1546 | } | |
1547 | ||
1548 | /* | |
1549 | * Trying to avoid low memory issues when a device is | |
1550 | * suspended. | |
1551 | */ | |
1552 | current->flags |= PF_MEMALLOC; | |
1553 | ||
1554 | /* | |
1555 | * Copy the parameters into kernel space. | |
1556 | */ | |
1557 | r = copy_params(user, ¶m); | |
1da177e4 | 1558 | |
dab6a429 AK |
1559 | current->flags &= ~PF_MEMALLOC; |
1560 | ||
1561 | if (r) | |
1562 | return r; | |
1da177e4 LT |
1563 | |
1564 | r = validate_params(cmd, param); | |
1565 | if (r) | |
1566 | goto out; | |
1567 | ||
1568 | param_size = param->data_size; | |
1569 | param->data_size = sizeof(*param); | |
1570 | r = fn(param, param_size); | |
1571 | ||
1572 | /* | |
1573 | * Copy the results back to userland. | |
1574 | */ | |
1575 | if (!r && copy_to_user(user, param, param->data_size)) | |
1576 | r = -EFAULT; | |
1577 | ||
1578 | out: | |
1579 | free_params(param); | |
1da177e4 LT |
1580 | return r; |
1581 | } | |
1582 | ||
27238b2b AK |
1583 | static long dm_ctl_ioctl(struct file *file, uint command, ulong u) |
1584 | { | |
1585 | return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u); | |
1586 | } | |
1587 | ||
76c072b4 MB |
1588 | #ifdef CONFIG_COMPAT |
1589 | static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u) | |
1590 | { | |
1591 | return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u)); | |
1592 | } | |
1593 | #else | |
1594 | #define dm_compat_ctl_ioctl NULL | |
1595 | #endif | |
1596 | ||
fa027c2a | 1597 | static const struct file_operations _ctl_fops = { |
27238b2b | 1598 | .unlocked_ioctl = dm_ctl_ioctl, |
76c072b4 | 1599 | .compat_ioctl = dm_compat_ctl_ioctl, |
1da177e4 LT |
1600 | .owner = THIS_MODULE, |
1601 | }; | |
1602 | ||
1603 | static struct miscdevice _dm_misc = { | |
1604 | .minor = MISC_DYNAMIC_MINOR, | |
1605 | .name = DM_NAME, | |
e454cea2 | 1606 | .nodename = "mapper/control", |
1da177e4 LT |
1607 | .fops = &_ctl_fops |
1608 | }; | |
1609 | ||
1610 | /* | |
1611 | * Create misc character device and link to DM_DIR/control. | |
1612 | */ | |
1613 | int __init dm_interface_init(void) | |
1614 | { | |
1615 | int r; | |
1616 | ||
1617 | r = dm_hash_init(); | |
1618 | if (r) | |
1619 | return r; | |
1620 | ||
1621 | r = misc_register(&_dm_misc); | |
1622 | if (r) { | |
1623 | DMERR("misc_register failed for control device"); | |
1624 | dm_hash_exit(); | |
1625 | return r; | |
1626 | } | |
1627 | ||
1628 | DMINFO("%d.%d.%d%s initialised: %s", DM_VERSION_MAJOR, | |
1629 | DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, DM_VERSION_EXTRA, | |
1630 | DM_DRIVER_EMAIL); | |
1631 | return 0; | |
1632 | } | |
1633 | ||
1634 | void dm_interface_exit(void) | |
1635 | { | |
1636 | if (misc_deregister(&_dm_misc) < 0) | |
1637 | DMERR("misc_deregister failed for control device"); | |
1638 | ||
1639 | dm_hash_exit(); | |
1640 | } | |
96a1f7db MA |
1641 | |
1642 | /** | |
1643 | * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers | |
1644 | * @md: Pointer to mapped_device | |
1645 | * @name: Buffer (size DM_NAME_LEN) for name | |
1646 | * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined | |
1647 | */ | |
1648 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) | |
1649 | { | |
1650 | int r = 0; | |
1651 | struct hash_cell *hc; | |
1652 | ||
1653 | if (!md) | |
1654 | return -ENXIO; | |
1655 | ||
6076905b | 1656 | mutex_lock(&dm_hash_cells_mutex); |
96a1f7db MA |
1657 | hc = dm_get_mdptr(md); |
1658 | if (!hc || hc->md != md) { | |
1659 | r = -ENXIO; | |
1660 | goto out; | |
1661 | } | |
1662 | ||
23d39f63 MB |
1663 | if (name) |
1664 | strcpy(name, hc->name); | |
1665 | if (uuid) | |
1666 | strcpy(uuid, hc->uuid ? : ""); | |
96a1f7db MA |
1667 | |
1668 | out: | |
6076905b | 1669 | mutex_unlock(&dm_hash_cells_mutex); |
96a1f7db MA |
1670 | |
1671 | return r; | |
1672 | } |