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Commit | Line | Data |
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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 | ||
60935eb2 | 288 | static int dm_hash_rename(uint32_t cookie, const char *old, const char *new) |
1da177e4 LT |
289 | { |
290 | char *new_name, *old_name; | |
291 | struct hash_cell *hc; | |
81f1777a | 292 | struct dm_table *table; |
1da177e4 LT |
293 | |
294 | /* | |
295 | * duplicate new. | |
296 | */ | |
543537bd | 297 | new_name = kstrdup(new, GFP_KERNEL); |
1da177e4 LT |
298 | if (!new_name) |
299 | return -ENOMEM; | |
300 | ||
301 | down_write(&_hash_lock); | |
302 | ||
303 | /* | |
304 | * Is new free ? | |
305 | */ | |
306 | hc = __get_name_cell(new); | |
307 | if (hc) { | |
308 | DMWARN("asked to rename to an already existing name %s -> %s", | |
309 | old, new); | |
7ec75f25 | 310 | dm_put(hc->md); |
1da177e4 LT |
311 | up_write(&_hash_lock); |
312 | kfree(new_name); | |
313 | return -EBUSY; | |
314 | } | |
315 | ||
316 | /* | |
317 | * Is there such a device as 'old' ? | |
318 | */ | |
319 | hc = __get_name_cell(old); | |
320 | if (!hc) { | |
321 | DMWARN("asked to rename a non existent device %s -> %s", | |
322 | old, new); | |
323 | up_write(&_hash_lock); | |
324 | kfree(new_name); | |
325 | return -ENXIO; | |
326 | } | |
327 | ||
328 | /* | |
329 | * rename and move the name cell. | |
330 | */ | |
1da177e4 LT |
331 | list_del(&hc->name_list); |
332 | old_name = hc->name; | |
6076905b | 333 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 334 | hc->name = new_name; |
6076905b | 335 | mutex_unlock(&dm_hash_cells_mutex); |
1da177e4 LT |
336 | list_add(&hc->name_list, _name_buckets + hash_str(new_name)); |
337 | ||
81f1777a | 338 | /* |
339 | * Wake up any dm event waiters. | |
340 | */ | |
7c666411 | 341 | table = dm_get_live_table(hc->md); |
81f1777a | 342 | if (table) { |
343 | dm_table_event(table); | |
344 | dm_table_put(table); | |
345 | } | |
346 | ||
60935eb2 | 347 | dm_kobject_uevent(hc->md, KOBJ_CHANGE, cookie); |
69267a30 | 348 | |
7ec75f25 | 349 | dm_put(hc->md); |
1da177e4 LT |
350 | up_write(&_hash_lock); |
351 | kfree(old_name); | |
352 | return 0; | |
353 | } | |
354 | ||
355 | /*----------------------------------------------------------------- | |
356 | * Implementation of the ioctl commands | |
357 | *---------------------------------------------------------------*/ | |
358 | /* | |
359 | * All the ioctl commands get dispatched to functions with this | |
360 | * prototype. | |
361 | */ | |
362 | typedef int (*ioctl_fn)(struct dm_ioctl *param, size_t param_size); | |
363 | ||
364 | static int remove_all(struct dm_ioctl *param, size_t param_size) | |
365 | { | |
5c6bd75d | 366 | dm_hash_remove_all(1); |
1da177e4 LT |
367 | param->data_size = 0; |
368 | return 0; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Round up the ptr to an 8-byte boundary. | |
373 | */ | |
374 | #define ALIGN_MASK 7 | |
375 | static inline void *align_ptr(void *ptr) | |
376 | { | |
377 | return (void *) (((size_t) (ptr + ALIGN_MASK)) & ~ALIGN_MASK); | |
378 | } | |
379 | ||
380 | /* | |
381 | * Retrieves the data payload buffer from an already allocated | |
382 | * struct dm_ioctl. | |
383 | */ | |
384 | static void *get_result_buffer(struct dm_ioctl *param, size_t param_size, | |
385 | size_t *len) | |
386 | { | |
387 | param->data_start = align_ptr(param + 1) - (void *) param; | |
388 | ||
389 | if (param->data_start < param_size) | |
390 | *len = param_size - param->data_start; | |
391 | else | |
392 | *len = 0; | |
393 | ||
394 | return ((void *) param) + param->data_start; | |
395 | } | |
396 | ||
397 | static int list_devices(struct dm_ioctl *param, size_t param_size) | |
398 | { | |
399 | unsigned int i; | |
400 | struct hash_cell *hc; | |
401 | size_t len, needed = 0; | |
402 | struct gendisk *disk; | |
403 | struct dm_name_list *nl, *old_nl = NULL; | |
404 | ||
405 | down_write(&_hash_lock); | |
406 | ||
407 | /* | |
408 | * Loop through all the devices working out how much | |
409 | * space we need. | |
410 | */ | |
411 | for (i = 0; i < NUM_BUCKETS; i++) { | |
412 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
413 | needed += sizeof(struct dm_name_list); | |
414 | needed += strlen(hc->name) + 1; | |
415 | needed += ALIGN_MASK; | |
416 | } | |
417 | } | |
418 | ||
419 | /* | |
420 | * Grab our output buffer. | |
421 | */ | |
422 | nl = get_result_buffer(param, param_size, &len); | |
423 | if (len < needed) { | |
424 | param->flags |= DM_BUFFER_FULL_FLAG; | |
425 | goto out; | |
426 | } | |
427 | param->data_size = param->data_start + needed; | |
428 | ||
429 | nl->dev = 0; /* Flags no data */ | |
430 | ||
431 | /* | |
432 | * Now loop through filling out the names. | |
433 | */ | |
434 | for (i = 0; i < NUM_BUCKETS; i++) { | |
435 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
436 | if (old_nl) | |
437 | old_nl->next = (uint32_t) ((void *) nl - | |
438 | (void *) old_nl); | |
439 | disk = dm_disk(hc->md); | |
f331c029 | 440 | nl->dev = huge_encode_dev(disk_devt(disk)); |
1da177e4 LT |
441 | nl->next = 0; |
442 | strcpy(nl->name, hc->name); | |
443 | ||
444 | old_nl = nl; | |
445 | nl = align_ptr(((void *) ++nl) + strlen(hc->name) + 1); | |
446 | } | |
447 | } | |
448 | ||
449 | out: | |
450 | up_write(&_hash_lock); | |
451 | return 0; | |
452 | } | |
453 | ||
454 | static void list_version_get_needed(struct target_type *tt, void *needed_param) | |
455 | { | |
456 | size_t *needed = needed_param; | |
457 | ||
c4cc6635 | 458 | *needed += sizeof(struct dm_target_versions); |
1da177e4 | 459 | *needed += strlen(tt->name); |
1da177e4 LT |
460 | *needed += ALIGN_MASK; |
461 | } | |
462 | ||
463 | static void list_version_get_info(struct target_type *tt, void *param) | |
464 | { | |
465 | struct vers_iter *info = param; | |
466 | ||
467 | /* Check space - it might have changed since the first iteration */ | |
468 | if ((char *)info->vers + sizeof(tt->version) + strlen(tt->name) + 1 > | |
469 | info->end) { | |
470 | ||
471 | info->flags = DM_BUFFER_FULL_FLAG; | |
472 | return; | |
473 | } | |
474 | ||
475 | if (info->old_vers) | |
476 | info->old_vers->next = (uint32_t) ((void *)info->vers - | |
477 | (void *)info->old_vers); | |
478 | info->vers->version[0] = tt->version[0]; | |
479 | info->vers->version[1] = tt->version[1]; | |
480 | info->vers->version[2] = tt->version[2]; | |
481 | info->vers->next = 0; | |
482 | strcpy(info->vers->name, tt->name); | |
483 | ||
484 | info->old_vers = info->vers; | |
485 | info->vers = align_ptr(((void *) ++info->vers) + strlen(tt->name) + 1); | |
486 | } | |
487 | ||
488 | static int list_versions(struct dm_ioctl *param, size_t param_size) | |
489 | { | |
490 | size_t len, needed = 0; | |
491 | struct dm_target_versions *vers; | |
492 | struct vers_iter iter_info; | |
493 | ||
494 | /* | |
495 | * Loop through all the devices working out how much | |
496 | * space we need. | |
497 | */ | |
498 | dm_target_iterate(list_version_get_needed, &needed); | |
499 | ||
500 | /* | |
501 | * Grab our output buffer. | |
502 | */ | |
503 | vers = get_result_buffer(param, param_size, &len); | |
504 | if (len < needed) { | |
505 | param->flags |= DM_BUFFER_FULL_FLAG; | |
506 | goto out; | |
507 | } | |
508 | param->data_size = param->data_start + needed; | |
509 | ||
510 | iter_info.param_size = param_size; | |
511 | iter_info.old_vers = NULL; | |
512 | iter_info.vers = vers; | |
513 | iter_info.flags = 0; | |
514 | iter_info.end = (char *)vers+len; | |
515 | ||
516 | /* | |
517 | * Now loop through filling out the names & versions. | |
518 | */ | |
519 | dm_target_iterate(list_version_get_info, &iter_info); | |
520 | param->flags |= iter_info.flags; | |
521 | ||
522 | out: | |
523 | return 0; | |
524 | } | |
525 | ||
526 | ||
527 | ||
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 | ||
538 | /* | |
539 | * Fills in a dm_ioctl structure, ready for sending back to | |
540 | * userland. | |
541 | */ | |
542 | static int __dev_status(struct mapped_device *md, struct dm_ioctl *param) | |
543 | { | |
544 | struct gendisk *disk = dm_disk(md); | |
545 | struct dm_table *table; | |
1da177e4 LT |
546 | |
547 | param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG | | |
548 | DM_ACTIVE_PRESENT_FLAG); | |
549 | ||
550 | if (dm_suspended(md)) | |
551 | param->flags |= DM_SUSPEND_FLAG; | |
552 | ||
f331c029 | 553 | param->dev = huge_encode_dev(disk_devt(disk)); |
1da177e4 | 554 | |
5c6bd75d AK |
555 | /* |
556 | * Yes, this will be out of date by the time it gets back | |
557 | * to userland, but it is still very useful for | |
558 | * debugging. | |
559 | */ | |
560 | param->open_count = dm_open_count(md); | |
1da177e4 | 561 | |
b7db9956 | 562 | if (get_disk_ro(disk)) |
1da177e4 LT |
563 | param->flags |= DM_READONLY_FLAG; |
564 | ||
565 | param->event_nr = dm_get_event_nr(md); | |
566 | ||
7c666411 | 567 | table = dm_get_live_table(md); |
1da177e4 LT |
568 | if (table) { |
569 | param->flags |= DM_ACTIVE_PRESENT_FLAG; | |
570 | param->target_count = dm_table_get_num_targets(table); | |
571 | dm_table_put(table); | |
572 | } else | |
573 | param->target_count = 0; | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static int dev_create(struct dm_ioctl *param, size_t param_size) | |
579 | { | |
2b06cfff | 580 | int r, m = DM_ANY_MINOR; |
1da177e4 LT |
581 | struct mapped_device *md; |
582 | ||
583 | r = check_name(param->name); | |
584 | if (r) | |
585 | return r; | |
586 | ||
587 | if (param->flags & DM_PERSISTENT_DEV_FLAG) | |
2b06cfff | 588 | m = MINOR(huge_decode_dev(param->dev)); |
1da177e4 | 589 | |
2b06cfff | 590 | r = dm_create(m, &md); |
1da177e4 LT |
591 | if (r) |
592 | return r; | |
593 | ||
594 | r = dm_hash_insert(param->name, *param->uuid ? param->uuid : NULL, md); | |
595 | if (r) { | |
596 | dm_put(md); | |
597 | return r; | |
598 | } | |
599 | ||
600 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
601 | ||
602 | r = __dev_status(md, param); | |
603 | dm_put(md); | |
604 | ||
605 | return r; | |
606 | } | |
607 | ||
608 | /* | |
609 | * Always use UUID for lookups if it's present, otherwise use name or dev. | |
610 | */ | |
858119e1 | 611 | static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) |
1da177e4 | 612 | { |
9ade92a9 AK |
613 | struct mapped_device *md; |
614 | void *mdptr = NULL; | |
615 | ||
1da177e4 LT |
616 | if (*param->uuid) |
617 | return __get_uuid_cell(param->uuid); | |
9ade92a9 AK |
618 | |
619 | if (*param->name) | |
1da177e4 | 620 | return __get_name_cell(param->name); |
9ade92a9 AK |
621 | |
622 | md = dm_get_md(huge_decode_dev(param->dev)); | |
bfc5ecdf AK |
623 | if (!md) |
624 | goto out; | |
625 | ||
626 | mdptr = dm_get_mdptr(md); | |
627 | if (!mdptr) | |
628 | dm_put(md); | |
9ade92a9 | 629 | |
bfc5ecdf | 630 | out: |
9ade92a9 | 631 | return mdptr; |
1da177e4 LT |
632 | } |
633 | ||
858119e1 | 634 | static struct mapped_device *find_device(struct dm_ioctl *param) |
1da177e4 LT |
635 | { |
636 | struct hash_cell *hc; | |
637 | struct mapped_device *md = NULL; | |
638 | ||
639 | down_read(&_hash_lock); | |
640 | hc = __find_device_hash_cell(param); | |
641 | if (hc) { | |
642 | md = hc->md; | |
1da177e4 LT |
643 | |
644 | /* | |
645 | * Sneakily write in both the name and the uuid | |
646 | * while we have the cell. | |
647 | */ | |
a518b86d | 648 | strlcpy(param->name, hc->name, sizeof(param->name)); |
1da177e4 | 649 | if (hc->uuid) |
a518b86d | 650 | strlcpy(param->uuid, hc->uuid, sizeof(param->uuid)); |
1da177e4 LT |
651 | else |
652 | param->uuid[0] = '\0'; | |
653 | ||
654 | if (hc->new_map) | |
655 | param->flags |= DM_INACTIVE_PRESENT_FLAG; | |
656 | else | |
657 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
658 | } | |
659 | up_read(&_hash_lock); | |
660 | ||
661 | return md; | |
662 | } | |
663 | ||
664 | static int dev_remove(struct dm_ioctl *param, size_t param_size) | |
665 | { | |
666 | struct hash_cell *hc; | |
7ec75f25 | 667 | struct mapped_device *md; |
5c6bd75d | 668 | int r; |
1da177e4 LT |
669 | |
670 | down_write(&_hash_lock); | |
671 | hc = __find_device_hash_cell(param); | |
672 | ||
673 | if (!hc) { | |
674 | DMWARN("device doesn't appear to be in the dev hash table."); | |
675 | up_write(&_hash_lock); | |
676 | return -ENXIO; | |
677 | } | |
678 | ||
7ec75f25 JM |
679 | md = hc->md; |
680 | ||
5c6bd75d AK |
681 | /* |
682 | * Ensure the device is not open and nothing further can open it. | |
683 | */ | |
684 | r = dm_lock_for_deletion(md); | |
685 | if (r) { | |
686 | DMWARN("unable to remove open device %s", hc->name); | |
687 | up_write(&_hash_lock); | |
688 | dm_put(md); | |
689 | return r; | |
690 | } | |
691 | ||
1da177e4 LT |
692 | __hash_remove(hc); |
693 | up_write(&_hash_lock); | |
60935eb2 MB |
694 | |
695 | dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr); | |
696 | ||
7ec75f25 | 697 | dm_put(md); |
1da177e4 LT |
698 | param->data_size = 0; |
699 | return 0; | |
700 | } | |
701 | ||
702 | /* | |
703 | * Check a string doesn't overrun the chunk of | |
704 | * memory we copied from userland. | |
705 | */ | |
706 | static int invalid_str(char *str, void *end) | |
707 | { | |
708 | while ((void *) str < end) | |
709 | if (!*str++) | |
710 | return 0; | |
711 | ||
712 | return -EINVAL; | |
713 | } | |
714 | ||
715 | static int dev_rename(struct dm_ioctl *param, size_t param_size) | |
716 | { | |
717 | int r; | |
718 | char *new_name = (char *) param + param->data_start; | |
719 | ||
27238b2b | 720 | if (new_name < param->data || |
bc0fd67f MB |
721 | invalid_str(new_name, (void *) param + param_size) || |
722 | strlen(new_name) > DM_NAME_LEN - 1) { | |
1da177e4 LT |
723 | DMWARN("Invalid new logical volume name supplied."); |
724 | return -EINVAL; | |
725 | } | |
726 | ||
727 | r = check_name(new_name); | |
728 | if (r) | |
729 | return r; | |
730 | ||
731 | param->data_size = 0; | |
60935eb2 | 732 | return dm_hash_rename(param->event_nr, param->name, new_name); |
1da177e4 LT |
733 | } |
734 | ||
3ac51e74 DW |
735 | static int dev_set_geometry(struct dm_ioctl *param, size_t param_size) |
736 | { | |
737 | int r = -EINVAL, x; | |
738 | struct mapped_device *md; | |
739 | struct hd_geometry geometry; | |
740 | unsigned long indata[4]; | |
741 | char *geostr = (char *) param + param->data_start; | |
742 | ||
743 | md = find_device(param); | |
744 | if (!md) | |
745 | return -ENXIO; | |
746 | ||
27238b2b | 747 | if (geostr < param->data || |
3ac51e74 DW |
748 | invalid_str(geostr, (void *) param + param_size)) { |
749 | DMWARN("Invalid geometry supplied."); | |
750 | goto out; | |
751 | } | |
752 | ||
753 | x = sscanf(geostr, "%lu %lu %lu %lu", indata, | |
754 | indata + 1, indata + 2, indata + 3); | |
755 | ||
756 | if (x != 4) { | |
757 | DMWARN("Unable to interpret geometry settings."); | |
758 | goto out; | |
759 | } | |
760 | ||
761 | if (indata[0] > 65535 || indata[1] > 255 || | |
762 | indata[2] > 255 || indata[3] > ULONG_MAX) { | |
763 | DMWARN("Geometry exceeds range limits."); | |
764 | goto out; | |
765 | } | |
766 | ||
767 | geometry.cylinders = indata[0]; | |
768 | geometry.heads = indata[1]; | |
769 | geometry.sectors = indata[2]; | |
770 | geometry.start = indata[3]; | |
771 | ||
772 | r = dm_set_geometry(md, &geometry); | |
773 | if (!r) | |
774 | r = __dev_status(md, param); | |
775 | ||
776 | param->data_size = 0; | |
777 | ||
778 | out: | |
779 | dm_put(md); | |
780 | return r; | |
781 | } | |
782 | ||
1da177e4 LT |
783 | static int do_suspend(struct dm_ioctl *param) |
784 | { | |
785 | int r = 0; | |
a3d77d35 | 786 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
787 | struct mapped_device *md; |
788 | ||
789 | md = find_device(param); | |
790 | if (!md) | |
791 | return -ENXIO; | |
792 | ||
6da487dc | 793 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 794 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
795 | if (param->flags & DM_NOFLUSH_FLAG) |
796 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
6da487dc | 797 | |
1da177e4 | 798 | if (!dm_suspended(md)) |
a3d77d35 | 799 | r = dm_suspend(md, suspend_flags); |
1da177e4 LT |
800 | |
801 | if (!r) | |
802 | r = __dev_status(md, param); | |
803 | ||
804 | dm_put(md); | |
805 | return r; | |
806 | } | |
807 | ||
808 | static int do_resume(struct dm_ioctl *param) | |
809 | { | |
810 | int r = 0; | |
a3d77d35 | 811 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
812 | struct hash_cell *hc; |
813 | struct mapped_device *md; | |
814 | struct dm_table *new_map; | |
815 | ||
816 | down_write(&_hash_lock); | |
817 | ||
818 | hc = __find_device_hash_cell(param); | |
819 | if (!hc) { | |
820 | DMWARN("device doesn't appear to be in the dev hash table."); | |
821 | up_write(&_hash_lock); | |
822 | return -ENXIO; | |
823 | } | |
824 | ||
825 | md = hc->md; | |
1da177e4 LT |
826 | |
827 | new_map = hc->new_map; | |
828 | hc->new_map = NULL; | |
829 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
830 | ||
831 | up_write(&_hash_lock); | |
832 | ||
833 | /* Do we need to load a new map ? */ | |
834 | if (new_map) { | |
835 | /* Suspend if it isn't already suspended */ | |
6da487dc | 836 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 837 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
838 | if (param->flags & DM_NOFLUSH_FLAG) |
839 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
1da177e4 | 840 | if (!dm_suspended(md)) |
a3d77d35 | 841 | dm_suspend(md, suspend_flags); |
1da177e4 LT |
842 | |
843 | r = dm_swap_table(md, new_map); | |
844 | if (r) { | |
d5816876 | 845 | dm_table_destroy(new_map); |
1da177e4 | 846 | dm_put(md); |
1da177e4 LT |
847 | return r; |
848 | } | |
849 | ||
850 | if (dm_table_get_mode(new_map) & FMODE_WRITE) | |
851 | set_disk_ro(dm_disk(md), 0); | |
852 | else | |
853 | set_disk_ro(dm_disk(md), 1); | |
1da177e4 LT |
854 | } |
855 | ||
856 | if (dm_suspended(md)) | |
857 | r = dm_resume(md); | |
858 | ||
60935eb2 MB |
859 | |
860 | if (!r) { | |
861 | dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr); | |
1da177e4 | 862 | r = __dev_status(md, param); |
60935eb2 | 863 | } |
1da177e4 LT |
864 | |
865 | dm_put(md); | |
866 | return r; | |
867 | } | |
868 | ||
869 | /* | |
870 | * Set or unset the suspension state of a device. | |
871 | * If the device already is in the requested state we just return its status. | |
872 | */ | |
873 | static int dev_suspend(struct dm_ioctl *param, size_t param_size) | |
874 | { | |
875 | if (param->flags & DM_SUSPEND_FLAG) | |
876 | return do_suspend(param); | |
877 | ||
878 | return do_resume(param); | |
879 | } | |
880 | ||
881 | /* | |
882 | * Copies device info back to user space, used by | |
883 | * the create and info ioctls. | |
884 | */ | |
885 | static int dev_status(struct dm_ioctl *param, size_t param_size) | |
886 | { | |
887 | int r; | |
888 | struct mapped_device *md; | |
889 | ||
890 | md = find_device(param); | |
891 | if (!md) | |
892 | return -ENXIO; | |
893 | ||
894 | r = __dev_status(md, param); | |
895 | dm_put(md); | |
896 | return r; | |
897 | } | |
898 | ||
899 | /* | |
900 | * Build up the status struct for each target | |
901 | */ | |
902 | static void retrieve_status(struct dm_table *table, | |
903 | struct dm_ioctl *param, size_t param_size) | |
904 | { | |
905 | unsigned int i, num_targets; | |
906 | struct dm_target_spec *spec; | |
907 | char *outbuf, *outptr; | |
908 | status_type_t type; | |
909 | size_t remaining, len, used = 0; | |
910 | ||
911 | outptr = outbuf = get_result_buffer(param, param_size, &len); | |
912 | ||
913 | if (param->flags & DM_STATUS_TABLE_FLAG) | |
914 | type = STATUSTYPE_TABLE; | |
915 | else | |
916 | type = STATUSTYPE_INFO; | |
917 | ||
918 | /* Get all the target info */ | |
919 | num_targets = dm_table_get_num_targets(table); | |
920 | for (i = 0; i < num_targets; i++) { | |
921 | struct dm_target *ti = dm_table_get_target(table, i); | |
922 | ||
923 | remaining = len - (outptr - outbuf); | |
924 | if (remaining <= sizeof(struct dm_target_spec)) { | |
925 | param->flags |= DM_BUFFER_FULL_FLAG; | |
926 | break; | |
927 | } | |
928 | ||
929 | spec = (struct dm_target_spec *) outptr; | |
930 | ||
931 | spec->status = 0; | |
932 | spec->sector_start = ti->begin; | |
933 | spec->length = ti->len; | |
934 | strncpy(spec->target_type, ti->type->name, | |
935 | sizeof(spec->target_type)); | |
936 | ||
937 | outptr += sizeof(struct dm_target_spec); | |
938 | remaining = len - (outptr - outbuf); | |
939 | if (remaining <= 0) { | |
940 | param->flags |= DM_BUFFER_FULL_FLAG; | |
941 | break; | |
942 | } | |
943 | ||
944 | /* Get the status/table string from the target driver */ | |
945 | if (ti->type->status) { | |
946 | if (ti->type->status(ti, type, outptr, remaining)) { | |
947 | param->flags |= DM_BUFFER_FULL_FLAG; | |
948 | break; | |
949 | } | |
950 | } else | |
951 | outptr[0] = '\0'; | |
952 | ||
953 | outptr += strlen(outptr) + 1; | |
954 | used = param->data_start + (outptr - outbuf); | |
955 | ||
956 | outptr = align_ptr(outptr); | |
957 | spec->next = outptr - outbuf; | |
958 | } | |
959 | ||
960 | if (used) | |
961 | param->data_size = used; | |
962 | ||
963 | param->target_count = num_targets; | |
964 | } | |
965 | ||
966 | /* | |
967 | * Wait for a device to report an event | |
968 | */ | |
969 | static int dev_wait(struct dm_ioctl *param, size_t param_size) | |
970 | { | |
971 | int r; | |
972 | struct mapped_device *md; | |
973 | struct dm_table *table; | |
974 | ||
975 | md = find_device(param); | |
976 | if (!md) | |
977 | return -ENXIO; | |
978 | ||
979 | /* | |
980 | * Wait for a notification event | |
981 | */ | |
982 | if (dm_wait_event(md, param->event_nr)) { | |
983 | r = -ERESTARTSYS; | |
984 | goto out; | |
985 | } | |
986 | ||
987 | /* | |
988 | * The userland program is going to want to know what | |
989 | * changed to trigger the event, so we may as well tell | |
990 | * him and save an ioctl. | |
991 | */ | |
992 | r = __dev_status(md, param); | |
993 | if (r) | |
994 | goto out; | |
995 | ||
7c666411 | 996 | table = dm_get_live_table(md); |
1da177e4 LT |
997 | if (table) { |
998 | retrieve_status(table, param, param_size); | |
999 | dm_table_put(table); | |
1000 | } | |
1001 | ||
1002 | out: | |
1003 | dm_put(md); | |
1004 | return r; | |
1005 | } | |
1006 | ||
aeb5d727 | 1007 | static inline fmode_t get_mode(struct dm_ioctl *param) |
1da177e4 | 1008 | { |
aeb5d727 | 1009 | fmode_t mode = FMODE_READ | FMODE_WRITE; |
1da177e4 LT |
1010 | |
1011 | if (param->flags & DM_READONLY_FLAG) | |
1012 | mode = FMODE_READ; | |
1013 | ||
1014 | return mode; | |
1015 | } | |
1016 | ||
1017 | static int next_target(struct dm_target_spec *last, uint32_t next, void *end, | |
1018 | struct dm_target_spec **spec, char **target_params) | |
1019 | { | |
1020 | *spec = (struct dm_target_spec *) ((unsigned char *) last + next); | |
1021 | *target_params = (char *) (*spec + 1); | |
1022 | ||
1023 | if (*spec < (last + 1)) | |
1024 | return -EINVAL; | |
1025 | ||
1026 | return invalid_str(*target_params, end); | |
1027 | } | |
1028 | ||
1029 | static int populate_table(struct dm_table *table, | |
1030 | struct dm_ioctl *param, size_t param_size) | |
1031 | { | |
1032 | int r; | |
1033 | unsigned int i = 0; | |
1034 | struct dm_target_spec *spec = (struct dm_target_spec *) param; | |
1035 | uint32_t next = param->data_start; | |
1036 | void *end = (void *) param + param_size; | |
1037 | char *target_params; | |
1038 | ||
1039 | if (!param->target_count) { | |
1040 | DMWARN("populate_table: no targets specified"); | |
1041 | return -EINVAL; | |
1042 | } | |
1043 | ||
1044 | for (i = 0; i < param->target_count; i++) { | |
1045 | ||
1046 | r = next_target(spec, next, end, &spec, &target_params); | |
1047 | if (r) { | |
1048 | DMWARN("unable to find target"); | |
1049 | return r; | |
1050 | } | |
1051 | ||
1052 | r = dm_table_add_target(table, spec->target_type, | |
1053 | (sector_t) spec->sector_start, | |
1054 | (sector_t) spec->length, | |
1055 | target_params); | |
1056 | if (r) { | |
1057 | DMWARN("error adding target to table"); | |
1058 | return r; | |
1059 | } | |
1060 | ||
1061 | next = spec->next; | |
1062 | } | |
1063 | ||
e6ee8c0b KU |
1064 | r = dm_table_set_type(table); |
1065 | if (r) { | |
1066 | DMWARN("unable to set table type"); | |
1067 | return r; | |
1068 | } | |
1069 | ||
1da177e4 LT |
1070 | return dm_table_complete(table); |
1071 | } | |
1072 | ||
9c47008d MP |
1073 | static int table_prealloc_integrity(struct dm_table *t, |
1074 | struct mapped_device *md) | |
1075 | { | |
1076 | struct list_head *devices = dm_table_get_devices(t); | |
1077 | struct dm_dev_internal *dd; | |
1078 | ||
1079 | list_for_each_entry(dd, devices, list) | |
1080 | if (bdev_get_integrity(dd->dm_dev.bdev)) | |
1081 | return blk_integrity_register(dm_disk(md), NULL); | |
1082 | ||
1083 | return 0; | |
1084 | } | |
1085 | ||
1da177e4 LT |
1086 | static int table_load(struct dm_ioctl *param, size_t param_size) |
1087 | { | |
1088 | int r; | |
1089 | struct hash_cell *hc; | |
1090 | struct dm_table *t; | |
1134e5ae MA |
1091 | struct mapped_device *md; |
1092 | ||
1093 | md = find_device(param); | |
1094 | if (!md) | |
1095 | return -ENXIO; | |
1da177e4 | 1096 | |
1134e5ae | 1097 | r = dm_table_create(&t, get_mode(param), param->target_count, md); |
1da177e4 | 1098 | if (r) |
1134e5ae | 1099 | goto out; |
1da177e4 LT |
1100 | |
1101 | r = populate_table(t, param, param_size); | |
1102 | if (r) { | |
f80a5570 | 1103 | dm_table_destroy(t); |
1134e5ae | 1104 | goto out; |
1da177e4 LT |
1105 | } |
1106 | ||
9c47008d MP |
1107 | r = table_prealloc_integrity(t, md); |
1108 | if (r) { | |
1109 | DMERR("%s: could not register integrity profile.", | |
1110 | dm_device_name(md)); | |
1111 | dm_table_destroy(t); | |
1112 | goto out; | |
1113 | } | |
1114 | ||
e6ee8c0b KU |
1115 | r = dm_table_alloc_md_mempools(t); |
1116 | if (r) { | |
1117 | DMWARN("unable to allocate mempools for this table"); | |
1118 | dm_table_destroy(t); | |
1119 | goto out; | |
1120 | } | |
1121 | ||
1da177e4 | 1122 | down_write(&_hash_lock); |
1134e5ae MA |
1123 | hc = dm_get_mdptr(md); |
1124 | if (!hc || hc->md != md) { | |
1125 | DMWARN("device has been removed from the dev hash table."); | |
f80a5570 | 1126 | dm_table_destroy(t); |
1134e5ae MA |
1127 | up_write(&_hash_lock); |
1128 | r = -ENXIO; | |
1129 | goto out; | |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | if (hc->new_map) | |
d5816876 | 1133 | dm_table_destroy(hc->new_map); |
1da177e4 | 1134 | hc->new_map = t; |
1134e5ae MA |
1135 | up_write(&_hash_lock); |
1136 | ||
1da177e4 | 1137 | param->flags |= DM_INACTIVE_PRESENT_FLAG; |
1134e5ae MA |
1138 | r = __dev_status(md, param); |
1139 | ||
1140 | out: | |
1141 | dm_put(md); | |
1da177e4 | 1142 | |
1da177e4 LT |
1143 | return r; |
1144 | } | |
1145 | ||
1146 | static int table_clear(struct dm_ioctl *param, size_t param_size) | |
1147 | { | |
1148 | int r; | |
1149 | struct hash_cell *hc; | |
7ec75f25 | 1150 | struct mapped_device *md; |
1da177e4 LT |
1151 | |
1152 | down_write(&_hash_lock); | |
1153 | ||
1154 | hc = __find_device_hash_cell(param); | |
1155 | if (!hc) { | |
1156 | DMWARN("device doesn't appear to be in the dev hash table."); | |
1157 | up_write(&_hash_lock); | |
1158 | return -ENXIO; | |
1159 | } | |
1160 | ||
1161 | if (hc->new_map) { | |
d5816876 | 1162 | dm_table_destroy(hc->new_map); |
1da177e4 LT |
1163 | hc->new_map = NULL; |
1164 | } | |
1165 | ||
1166 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
1167 | ||
1168 | r = __dev_status(hc->md, param); | |
7ec75f25 | 1169 | md = hc->md; |
1da177e4 | 1170 | up_write(&_hash_lock); |
7ec75f25 | 1171 | dm_put(md); |
1da177e4 LT |
1172 | return r; |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * Retrieves a list of devices used by a particular dm device. | |
1177 | */ | |
1178 | static void retrieve_deps(struct dm_table *table, | |
1179 | struct dm_ioctl *param, size_t param_size) | |
1180 | { | |
1181 | unsigned int count = 0; | |
1182 | struct list_head *tmp; | |
1183 | size_t len, needed; | |
82b1519b | 1184 | struct dm_dev_internal *dd; |
1da177e4 LT |
1185 | struct dm_target_deps *deps; |
1186 | ||
1187 | deps = get_result_buffer(param, param_size, &len); | |
1188 | ||
1189 | /* | |
1190 | * Count the devices. | |
1191 | */ | |
1192 | list_for_each (tmp, dm_table_get_devices(table)) | |
1193 | count++; | |
1194 | ||
1195 | /* | |
1196 | * Check we have enough space. | |
1197 | */ | |
1198 | needed = sizeof(*deps) + (sizeof(*deps->dev) * count); | |
1199 | if (len < needed) { | |
1200 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1201 | return; | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * Fill in the devices. | |
1206 | */ | |
1207 | deps->count = count; | |
1208 | count = 0; | |
1209 | list_for_each_entry (dd, dm_table_get_devices(table), list) | |
82b1519b | 1210 | deps->dev[count++] = huge_encode_dev(dd->dm_dev.bdev->bd_dev); |
1da177e4 LT |
1211 | |
1212 | param->data_size = param->data_start + needed; | |
1213 | } | |
1214 | ||
1215 | static int table_deps(struct dm_ioctl *param, size_t param_size) | |
1216 | { | |
1217 | int r = 0; | |
1218 | struct mapped_device *md; | |
1219 | struct dm_table *table; | |
1220 | ||
1221 | md = find_device(param); | |
1222 | if (!md) | |
1223 | return -ENXIO; | |
1224 | ||
1225 | r = __dev_status(md, param); | |
1226 | if (r) | |
1227 | goto out; | |
1228 | ||
7c666411 | 1229 | table = dm_get_live_table(md); |
1da177e4 LT |
1230 | if (table) { |
1231 | retrieve_deps(table, param, param_size); | |
1232 | dm_table_put(table); | |
1233 | } | |
1234 | ||
1235 | out: | |
1236 | dm_put(md); | |
1237 | return r; | |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * Return the status of a device as a text string for each | |
1242 | * target. | |
1243 | */ | |
1244 | static int table_status(struct dm_ioctl *param, size_t param_size) | |
1245 | { | |
1246 | int r; | |
1247 | struct mapped_device *md; | |
1248 | struct dm_table *table; | |
1249 | ||
1250 | md = find_device(param); | |
1251 | if (!md) | |
1252 | return -ENXIO; | |
1253 | ||
1254 | r = __dev_status(md, param); | |
1255 | if (r) | |
1256 | goto out; | |
1257 | ||
7c666411 | 1258 | table = dm_get_live_table(md); |
1da177e4 LT |
1259 | if (table) { |
1260 | retrieve_status(table, param, param_size); | |
1261 | dm_table_put(table); | |
1262 | } | |
1263 | ||
1264 | out: | |
1265 | dm_put(md); | |
1266 | return r; | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * Pass a message to the target that's at the supplied device offset. | |
1271 | */ | |
1272 | static int target_message(struct dm_ioctl *param, size_t param_size) | |
1273 | { | |
1274 | int r, argc; | |
1275 | char **argv; | |
1276 | struct mapped_device *md; | |
1277 | struct dm_table *table; | |
1278 | struct dm_target *ti; | |
1279 | struct dm_target_msg *tmsg = (void *) param + param->data_start; | |
1280 | ||
1281 | md = find_device(param); | |
1282 | if (!md) | |
1283 | return -ENXIO; | |
1284 | ||
1285 | r = __dev_status(md, param); | |
1286 | if (r) | |
1287 | goto out; | |
1288 | ||
027d50f9 | 1289 | if (tmsg < (struct dm_target_msg *) param->data || |
1da177e4 LT |
1290 | invalid_str(tmsg->message, (void *) param + param_size)) { |
1291 | DMWARN("Invalid target message parameters."); | |
1292 | r = -EINVAL; | |
1293 | goto out; | |
1294 | } | |
1295 | ||
1296 | r = dm_split_args(&argc, &argv, tmsg->message); | |
1297 | if (r) { | |
1298 | DMWARN("Failed to split target message parameters"); | |
1299 | goto out; | |
1300 | } | |
1301 | ||
7c666411 | 1302 | table = dm_get_live_table(md); |
1da177e4 LT |
1303 | if (!table) |
1304 | goto out_argv; | |
1305 | ||
512875bd JN |
1306 | ti = dm_table_find_target(table, tmsg->sector); |
1307 | if (!dm_target_is_valid(ti)) { | |
1da177e4 LT |
1308 | DMWARN("Target message sector outside device."); |
1309 | r = -EINVAL; | |
512875bd | 1310 | } else if (ti->type->message) |
1da177e4 LT |
1311 | r = ti->type->message(ti, argc, argv); |
1312 | else { | |
1313 | DMWARN("Target type does not support messages"); | |
1314 | r = -EINVAL; | |
1315 | } | |
1316 | ||
1da177e4 LT |
1317 | dm_table_put(table); |
1318 | out_argv: | |
1319 | kfree(argv); | |
1320 | out: | |
1321 | param->data_size = 0; | |
1322 | dm_put(md); | |
1323 | return r; | |
1324 | } | |
1325 | ||
1326 | /*----------------------------------------------------------------- | |
1327 | * Implementation of open/close/ioctl on the special char | |
1328 | * device. | |
1329 | *---------------------------------------------------------------*/ | |
1330 | static ioctl_fn lookup_ioctl(unsigned int cmd) | |
1331 | { | |
1332 | static struct { | |
1333 | int cmd; | |
1334 | ioctl_fn fn; | |
1335 | } _ioctls[] = { | |
1336 | {DM_VERSION_CMD, NULL}, /* version is dealt with elsewhere */ | |
1337 | {DM_REMOVE_ALL_CMD, remove_all}, | |
1338 | {DM_LIST_DEVICES_CMD, list_devices}, | |
1339 | ||
1340 | {DM_DEV_CREATE_CMD, dev_create}, | |
1341 | {DM_DEV_REMOVE_CMD, dev_remove}, | |
1342 | {DM_DEV_RENAME_CMD, dev_rename}, | |
1343 | {DM_DEV_SUSPEND_CMD, dev_suspend}, | |
1344 | {DM_DEV_STATUS_CMD, dev_status}, | |
1345 | {DM_DEV_WAIT_CMD, dev_wait}, | |
1346 | ||
1347 | {DM_TABLE_LOAD_CMD, table_load}, | |
1348 | {DM_TABLE_CLEAR_CMD, table_clear}, | |
1349 | {DM_TABLE_DEPS_CMD, table_deps}, | |
1350 | {DM_TABLE_STATUS_CMD, table_status}, | |
1351 | ||
1352 | {DM_LIST_VERSIONS_CMD, list_versions}, | |
1353 | ||
3ac51e74 DW |
1354 | {DM_TARGET_MSG_CMD, target_message}, |
1355 | {DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry} | |
1da177e4 LT |
1356 | }; |
1357 | ||
1358 | return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn; | |
1359 | } | |
1360 | ||
1361 | /* | |
1362 | * As well as checking the version compatibility this always | |
1363 | * copies the kernel interface version out. | |
1364 | */ | |
1365 | static int check_version(unsigned int cmd, struct dm_ioctl __user *user) | |
1366 | { | |
1367 | uint32_t version[3]; | |
1368 | int r = 0; | |
1369 | ||
1370 | if (copy_from_user(version, user->version, sizeof(version))) | |
1371 | return -EFAULT; | |
1372 | ||
1373 | if ((DM_VERSION_MAJOR != version[0]) || | |
1374 | (DM_VERSION_MINOR < version[1])) { | |
1375 | DMWARN("ioctl interface mismatch: " | |
1376 | "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)", | |
1377 | DM_VERSION_MAJOR, DM_VERSION_MINOR, | |
1378 | DM_VERSION_PATCHLEVEL, | |
1379 | version[0], version[1], version[2], cmd); | |
1380 | r = -EINVAL; | |
1381 | } | |
1382 | ||
1383 | /* | |
1384 | * Fill in the kernel version. | |
1385 | */ | |
1386 | version[0] = DM_VERSION_MAJOR; | |
1387 | version[1] = DM_VERSION_MINOR; | |
1388 | version[2] = DM_VERSION_PATCHLEVEL; | |
1389 | if (copy_to_user(user->version, version, sizeof(version))) | |
1390 | return -EFAULT; | |
1391 | ||
1392 | return r; | |
1393 | } | |
1394 | ||
1395 | static void free_params(struct dm_ioctl *param) | |
1396 | { | |
1397 | vfree(param); | |
1398 | } | |
1399 | ||
1400 | static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param) | |
1401 | { | |
1402 | struct dm_ioctl tmp, *dmi; | |
1403 | ||
76c072b4 | 1404 | if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data))) |
1da177e4 LT |
1405 | return -EFAULT; |
1406 | ||
76c072b4 | 1407 | if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data))) |
1da177e4 LT |
1408 | return -EINVAL; |
1409 | ||
bb56acf8 | 1410 | dmi = vmalloc(tmp.data_size); |
1da177e4 LT |
1411 | if (!dmi) |
1412 | return -ENOMEM; | |
1413 | ||
1414 | if (copy_from_user(dmi, user, tmp.data_size)) { | |
1415 | vfree(dmi); | |
1416 | return -EFAULT; | |
1417 | } | |
1418 | ||
1419 | *param = dmi; | |
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | static int validate_params(uint cmd, struct dm_ioctl *param) | |
1424 | { | |
1425 | /* Always clear this flag */ | |
1426 | param->flags &= ~DM_BUFFER_FULL_FLAG; | |
1427 | ||
1428 | /* Ignores parameters */ | |
1429 | if (cmd == DM_REMOVE_ALL_CMD || | |
1430 | cmd == DM_LIST_DEVICES_CMD || | |
1431 | cmd == DM_LIST_VERSIONS_CMD) | |
1432 | return 0; | |
1433 | ||
1434 | if ((cmd == DM_DEV_CREATE_CMD)) { | |
1435 | if (!*param->name) { | |
1436 | DMWARN("name not supplied when creating device"); | |
1437 | return -EINVAL; | |
1438 | } | |
1439 | } else if ((*param->uuid && *param->name)) { | |
1440 | DMWARN("only supply one of name or uuid, cmd(%u)", cmd); | |
1441 | return -EINVAL; | |
1442 | } | |
1443 | ||
1444 | /* Ensure strings are terminated */ | |
1445 | param->name[DM_NAME_LEN - 1] = '\0'; | |
1446 | param->uuid[DM_UUID_LEN - 1] = '\0'; | |
1447 | ||
1448 | return 0; | |
1449 | } | |
1450 | ||
27238b2b | 1451 | static int ctl_ioctl(uint command, struct dm_ioctl __user *user) |
1da177e4 LT |
1452 | { |
1453 | int r = 0; | |
1454 | unsigned int cmd; | |
a26ffd4a | 1455 | struct dm_ioctl *uninitialized_var(param); |
1da177e4 LT |
1456 | ioctl_fn fn = NULL; |
1457 | size_t param_size; | |
1458 | ||
1459 | /* only root can play with this */ | |
1460 | if (!capable(CAP_SYS_ADMIN)) | |
1461 | return -EACCES; | |
1462 | ||
1463 | if (_IOC_TYPE(command) != DM_IOCTL) | |
1464 | return -ENOTTY; | |
1465 | ||
1466 | cmd = _IOC_NR(command); | |
1467 | ||
1468 | /* | |
1469 | * Check the interface version passed in. This also | |
1470 | * writes out the kernel's interface version. | |
1471 | */ | |
1472 | r = check_version(cmd, user); | |
1473 | if (r) | |
1474 | return r; | |
1475 | ||
1476 | /* | |
1477 | * Nothing more to do for the version command. | |
1478 | */ | |
1479 | if (cmd == DM_VERSION_CMD) | |
1480 | return 0; | |
1481 | ||
1482 | fn = lookup_ioctl(cmd); | |
1483 | if (!fn) { | |
1484 | DMWARN("dm_ctl_ioctl: unknown command 0x%x", command); | |
1485 | return -ENOTTY; | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Trying to avoid low memory issues when a device is | |
1490 | * suspended. | |
1491 | */ | |
1492 | current->flags |= PF_MEMALLOC; | |
1493 | ||
1494 | /* | |
1495 | * Copy the parameters into kernel space. | |
1496 | */ | |
1497 | r = copy_params(user, ¶m); | |
1da177e4 | 1498 | |
dab6a429 AK |
1499 | current->flags &= ~PF_MEMALLOC; |
1500 | ||
1501 | if (r) | |
1502 | return r; | |
1da177e4 LT |
1503 | |
1504 | r = validate_params(cmd, param); | |
1505 | if (r) | |
1506 | goto out; | |
1507 | ||
1508 | param_size = param->data_size; | |
1509 | param->data_size = sizeof(*param); | |
1510 | r = fn(param, param_size); | |
1511 | ||
1512 | /* | |
1513 | * Copy the results back to userland. | |
1514 | */ | |
1515 | if (!r && copy_to_user(user, param, param->data_size)) | |
1516 | r = -EFAULT; | |
1517 | ||
1518 | out: | |
1519 | free_params(param); | |
1da177e4 LT |
1520 | return r; |
1521 | } | |
1522 | ||
27238b2b AK |
1523 | static long dm_ctl_ioctl(struct file *file, uint command, ulong u) |
1524 | { | |
1525 | return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u); | |
1526 | } | |
1527 | ||
76c072b4 MB |
1528 | #ifdef CONFIG_COMPAT |
1529 | static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u) | |
1530 | { | |
1531 | return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u)); | |
1532 | } | |
1533 | #else | |
1534 | #define dm_compat_ctl_ioctl NULL | |
1535 | #endif | |
1536 | ||
fa027c2a | 1537 | static const struct file_operations _ctl_fops = { |
27238b2b | 1538 | .unlocked_ioctl = dm_ctl_ioctl, |
76c072b4 | 1539 | .compat_ioctl = dm_compat_ctl_ioctl, |
1da177e4 LT |
1540 | .owner = THIS_MODULE, |
1541 | }; | |
1542 | ||
1543 | static struct miscdevice _dm_misc = { | |
1544 | .minor = MISC_DYNAMIC_MINOR, | |
1545 | .name = DM_NAME, | |
e454cea2 | 1546 | .nodename = "mapper/control", |
1da177e4 LT |
1547 | .fops = &_ctl_fops |
1548 | }; | |
1549 | ||
1550 | /* | |
1551 | * Create misc character device and link to DM_DIR/control. | |
1552 | */ | |
1553 | int __init dm_interface_init(void) | |
1554 | { | |
1555 | int r; | |
1556 | ||
1557 | r = dm_hash_init(); | |
1558 | if (r) | |
1559 | return r; | |
1560 | ||
1561 | r = misc_register(&_dm_misc); | |
1562 | if (r) { | |
1563 | DMERR("misc_register failed for control device"); | |
1564 | dm_hash_exit(); | |
1565 | return r; | |
1566 | } | |
1567 | ||
1568 | DMINFO("%d.%d.%d%s initialised: %s", DM_VERSION_MAJOR, | |
1569 | DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, DM_VERSION_EXTRA, | |
1570 | DM_DRIVER_EMAIL); | |
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | void dm_interface_exit(void) | |
1575 | { | |
1576 | if (misc_deregister(&_dm_misc) < 0) | |
1577 | DMERR("misc_deregister failed for control device"); | |
1578 | ||
1579 | dm_hash_exit(); | |
1580 | } | |
96a1f7db MA |
1581 | |
1582 | /** | |
1583 | * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers | |
1584 | * @md: Pointer to mapped_device | |
1585 | * @name: Buffer (size DM_NAME_LEN) for name | |
1586 | * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined | |
1587 | */ | |
1588 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) | |
1589 | { | |
1590 | int r = 0; | |
1591 | struct hash_cell *hc; | |
1592 | ||
1593 | if (!md) | |
1594 | return -ENXIO; | |
1595 | ||
6076905b | 1596 | mutex_lock(&dm_hash_cells_mutex); |
96a1f7db MA |
1597 | hc = dm_get_mdptr(md); |
1598 | if (!hc || hc->md != md) { | |
1599 | r = -ENXIO; | |
1600 | goto out; | |
1601 | } | |
1602 | ||
23d39f63 MB |
1603 | if (name) |
1604 | strcpy(name, hc->name); | |
1605 | if (uuid) | |
1606 | strcpy(uuid, hc->uuid ? : ""); | |
96a1f7db MA |
1607 | |
1608 | out: | |
6076905b | 1609 | mutex_unlock(&dm_hash_cells_mutex); |
96a1f7db MA |
1610 | |
1611 | return r; | |
1612 | } |