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