Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. | |
2b06cfff | 3 | * Copyright (C) 2004 - 2006 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
8 | #include "dm.h" | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/vmalloc.h> | |
12 | #include <linux/miscdevice.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/slab.h> | |
1da177e4 | 16 | #include <linux/dm-ioctl.h> |
3ac51e74 | 17 | #include <linux/hdreg.h> |
76c072b4 | 18 | #include <linux/compat.h> |
1da177e4 LT |
19 | |
20 | #include <asm/uaccess.h> | |
21 | ||
72d94861 | 22 | #define DM_MSG_PREFIX "ioctl" |
1da177e4 LT |
23 | #define DM_DRIVER_EMAIL "dm-devel@redhat.com" |
24 | ||
25 | /*----------------------------------------------------------------- | |
26 | * The ioctl interface needs to be able to look up devices by | |
27 | * name or uuid. | |
28 | *---------------------------------------------------------------*/ | |
29 | struct hash_cell { | |
30 | struct list_head name_list; | |
31 | struct list_head uuid_list; | |
32 | ||
33 | char *name; | |
34 | char *uuid; | |
35 | struct mapped_device *md; | |
36 | struct dm_table *new_map; | |
37 | }; | |
38 | ||
39 | struct vers_iter { | |
40 | size_t param_size; | |
41 | struct dm_target_versions *vers, *old_vers; | |
42 | char *end; | |
43 | uint32_t flags; | |
44 | }; | |
45 | ||
46 | ||
47 | #define NUM_BUCKETS 64 | |
48 | #define MASK_BUCKETS (NUM_BUCKETS - 1) | |
49 | static struct list_head _name_buckets[NUM_BUCKETS]; | |
50 | static struct list_head _uuid_buckets[NUM_BUCKETS]; | |
51 | ||
5c6bd75d | 52 | static void dm_hash_remove_all(int keep_open_devices); |
1da177e4 LT |
53 | |
54 | /* | |
55 | * Guards access to both hash tables. | |
56 | */ | |
57 | static DECLARE_RWSEM(_hash_lock); | |
58 | ||
6076905b MP |
59 | /* |
60 | * Protects use of mdptr to obtain hash cell name and uuid from mapped device. | |
61 | */ | |
62 | static DEFINE_MUTEX(dm_hash_cells_mutex); | |
63 | ||
1da177e4 LT |
64 | static void init_buckets(struct list_head *buckets) |
65 | { | |
66 | unsigned int i; | |
67 | ||
68 | for (i = 0; i < NUM_BUCKETS; i++) | |
69 | INIT_LIST_HEAD(buckets + i); | |
70 | } | |
71 | ||
72 | static int dm_hash_init(void) | |
73 | { | |
74 | init_buckets(_name_buckets); | |
75 | init_buckets(_uuid_buckets); | |
1da177e4 LT |
76 | return 0; |
77 | } | |
78 | ||
79 | static void dm_hash_exit(void) | |
80 | { | |
5c6bd75d | 81 | dm_hash_remove_all(0); |
1da177e4 LT |
82 | } |
83 | ||
84 | /*----------------------------------------------------------------- | |
85 | * Hash function: | |
86 | * We're not really concerned with the str hash function being | |
87 | * fast since it's only used by the ioctl interface. | |
88 | *---------------------------------------------------------------*/ | |
89 | static unsigned int hash_str(const char *str) | |
90 | { | |
91 | const unsigned int hash_mult = 2654435387U; | |
92 | unsigned int h = 0; | |
93 | ||
94 | while (*str) | |
95 | h = (h + (unsigned int) *str++) * hash_mult; | |
96 | ||
97 | return h & MASK_BUCKETS; | |
98 | } | |
99 | ||
100 | /*----------------------------------------------------------------- | |
101 | * Code for looking up a device by name | |
102 | *---------------------------------------------------------------*/ | |
103 | static struct hash_cell *__get_name_cell(const char *str) | |
104 | { | |
105 | struct hash_cell *hc; | |
106 | unsigned int h = hash_str(str); | |
107 | ||
108 | list_for_each_entry (hc, _name_buckets + h, name_list) | |
7ec75f25 JM |
109 | if (!strcmp(hc->name, str)) { |
110 | dm_get(hc->md); | |
1da177e4 | 111 | return hc; |
7ec75f25 | 112 | } |
1da177e4 LT |
113 | |
114 | return NULL; | |
115 | } | |
116 | ||
117 | static struct hash_cell *__get_uuid_cell(const char *str) | |
118 | { | |
119 | struct hash_cell *hc; | |
120 | unsigned int h = hash_str(str); | |
121 | ||
122 | list_for_each_entry (hc, _uuid_buckets + h, uuid_list) | |
7ec75f25 JM |
123 | if (!strcmp(hc->uuid, str)) { |
124 | dm_get(hc->md); | |
1da177e4 | 125 | return hc; |
7ec75f25 | 126 | } |
1da177e4 LT |
127 | |
128 | return NULL; | |
129 | } | |
130 | ||
131 | /*----------------------------------------------------------------- | |
132 | * Inserting, removing and renaming a device. | |
133 | *---------------------------------------------------------------*/ | |
1da177e4 LT |
134 | static struct hash_cell *alloc_cell(const char *name, const char *uuid, |
135 | struct mapped_device *md) | |
136 | { | |
137 | struct hash_cell *hc; | |
138 | ||
139 | hc = kmalloc(sizeof(*hc), GFP_KERNEL); | |
140 | if (!hc) | |
141 | return NULL; | |
142 | ||
543537bd | 143 | hc->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
144 | if (!hc->name) { |
145 | kfree(hc); | |
146 | return NULL; | |
147 | } | |
148 | ||
149 | if (!uuid) | |
150 | hc->uuid = NULL; | |
151 | ||
152 | else { | |
543537bd | 153 | hc->uuid = kstrdup(uuid, GFP_KERNEL); |
1da177e4 LT |
154 | if (!hc->uuid) { |
155 | kfree(hc->name); | |
156 | kfree(hc); | |
157 | return NULL; | |
158 | } | |
159 | } | |
160 | ||
161 | INIT_LIST_HEAD(&hc->name_list); | |
162 | INIT_LIST_HEAD(&hc->uuid_list); | |
163 | hc->md = md; | |
164 | hc->new_map = NULL; | |
165 | return hc; | |
166 | } | |
167 | ||
168 | static void free_cell(struct hash_cell *hc) | |
169 | { | |
170 | if (hc) { | |
171 | kfree(hc->name); | |
172 | kfree(hc->uuid); | |
173 | kfree(hc); | |
174 | } | |
175 | } | |
176 | ||
1da177e4 LT |
177 | /* |
178 | * The kdev_t and uuid of a device can never change once it is | |
179 | * initially inserted. | |
180 | */ | |
181 | static int dm_hash_insert(const char *name, const char *uuid, struct mapped_device *md) | |
182 | { | |
7ec75f25 | 183 | struct hash_cell *cell, *hc; |
1da177e4 LT |
184 | |
185 | /* | |
186 | * Allocate the new cells. | |
187 | */ | |
188 | cell = alloc_cell(name, uuid, md); | |
189 | if (!cell) | |
190 | return -ENOMEM; | |
191 | ||
192 | /* | |
193 | * Insert the cell into both hash tables. | |
194 | */ | |
195 | down_write(&_hash_lock); | |
7ec75f25 JM |
196 | hc = __get_name_cell(name); |
197 | if (hc) { | |
198 | dm_put(hc->md); | |
1da177e4 | 199 | goto bad; |
7ec75f25 | 200 | } |
1da177e4 LT |
201 | |
202 | list_add(&cell->name_list, _name_buckets + hash_str(name)); | |
203 | ||
204 | if (uuid) { | |
7ec75f25 JM |
205 | hc = __get_uuid_cell(uuid); |
206 | if (hc) { | |
1da177e4 | 207 | list_del(&cell->name_list); |
7ec75f25 | 208 | dm_put(hc->md); |
1da177e4 LT |
209 | goto bad; |
210 | } | |
211 | list_add(&cell->uuid_list, _uuid_buckets + hash_str(uuid)); | |
212 | } | |
1da177e4 | 213 | dm_get(md); |
6076905b | 214 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 215 | dm_set_mdptr(md, cell); |
6076905b | 216 | mutex_unlock(&dm_hash_cells_mutex); |
1da177e4 LT |
217 | up_write(&_hash_lock); |
218 | ||
219 | return 0; | |
220 | ||
221 | bad: | |
222 | up_write(&_hash_lock); | |
223 | free_cell(cell); | |
224 | return -EBUSY; | |
225 | } | |
226 | ||
227 | static void __hash_remove(struct hash_cell *hc) | |
228 | { | |
269fd2a6 | 229 | struct dm_table *table; |
230 | ||
1da177e4 LT |
231 | /* remove from the dev hash */ |
232 | list_del(&hc->uuid_list); | |
233 | list_del(&hc->name_list); | |
6076905b | 234 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 235 | dm_set_mdptr(hc->md, NULL); |
6076905b | 236 | mutex_unlock(&dm_hash_cells_mutex); |
269fd2a6 | 237 | |
7c666411 | 238 | table = dm_get_live_table(hc->md); |
269fd2a6 | 239 | if (table) { |
240 | dm_table_event(table); | |
241 | dm_table_put(table); | |
242 | } | |
243 | ||
1da177e4 | 244 | if (hc->new_map) |
d5816876 | 245 | dm_table_destroy(hc->new_map); |
1134e5ae | 246 | dm_put(hc->md); |
1da177e4 LT |
247 | free_cell(hc); |
248 | } | |
249 | ||
5c6bd75d | 250 | static void dm_hash_remove_all(int keep_open_devices) |
1da177e4 | 251 | { |
98f33285 | 252 | int i, dev_skipped; |
1da177e4 | 253 | struct hash_cell *hc; |
98f33285 KU |
254 | struct mapped_device *md; |
255 | ||
256 | retry: | |
257 | dev_skipped = 0; | |
1da177e4 LT |
258 | |
259 | down_write(&_hash_lock); | |
5c6bd75d | 260 | |
1da177e4 | 261 | for (i = 0; i < NUM_BUCKETS; i++) { |
98f33285 KU |
262 | list_for_each_entry(hc, _name_buckets + i, name_list) { |
263 | md = hc->md; | |
264 | dm_get(md); | |
5c6bd75d | 265 | |
98f33285 KU |
266 | if (keep_open_devices && dm_lock_for_deletion(md)) { |
267 | dm_put(md); | |
5c6bd75d AK |
268 | dev_skipped++; |
269 | continue; | |
270 | } | |
98f33285 | 271 | |
1da177e4 | 272 | __hash_remove(hc); |
5c6bd75d | 273 | |
98f33285 | 274 | up_write(&_hash_lock); |
5c6bd75d | 275 | |
98f33285 | 276 | dm_put(md); |
3f77316d KU |
277 | if (likely(keep_open_devices)) |
278 | dm_destroy(md); | |
279 | else | |
280 | dm_destroy_immediate(md); | |
98f33285 KU |
281 | |
282 | /* | |
283 | * Some mapped devices may be using other mapped | |
284 | * devices, so repeat until we make no further | |
285 | * progress. If a new mapped device is created | |
286 | * here it will also get removed. | |
287 | */ | |
288 | goto retry; | |
289 | } | |
5c6bd75d AK |
290 | } |
291 | ||
1da177e4 | 292 | up_write(&_hash_lock); |
98f33285 KU |
293 | |
294 | if (dev_skipped) | |
295 | DMWARN("remove_all left %d open device(s)", dev_skipped); | |
1da177e4 LT |
296 | } |
297 | ||
856a6f1d PR |
298 | static struct mapped_device *dm_hash_rename(struct dm_ioctl *param, |
299 | const char *new) | |
1da177e4 LT |
300 | { |
301 | char *new_name, *old_name; | |
302 | struct hash_cell *hc; | |
81f1777a | 303 | struct dm_table *table; |
856a6f1d | 304 | struct mapped_device *md; |
1da177e4 LT |
305 | |
306 | /* | |
307 | * duplicate new. | |
308 | */ | |
543537bd | 309 | new_name = kstrdup(new, GFP_KERNEL); |
1da177e4 | 310 | if (!new_name) |
856a6f1d | 311 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
312 | |
313 | down_write(&_hash_lock); | |
314 | ||
315 | /* | |
316 | * Is new free ? | |
317 | */ | |
318 | hc = __get_name_cell(new); | |
319 | if (hc) { | |
856a6f1d PR |
320 | DMWARN("asked to rename to an already-existing name %s -> %s", |
321 | param->name, new); | |
7ec75f25 | 322 | dm_put(hc->md); |
1da177e4 LT |
323 | up_write(&_hash_lock); |
324 | kfree(new_name); | |
856a6f1d | 325 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
326 | } |
327 | ||
328 | /* | |
329 | * Is there such a device as 'old' ? | |
330 | */ | |
856a6f1d | 331 | hc = __get_name_cell(param->name); |
1da177e4 | 332 | if (!hc) { |
856a6f1d PR |
333 | DMWARN("asked to rename a non-existent device %s -> %s", |
334 | param->name, new); | |
1da177e4 LT |
335 | up_write(&_hash_lock); |
336 | kfree(new_name); | |
856a6f1d | 337 | return ERR_PTR(-ENXIO); |
1da177e4 LT |
338 | } |
339 | ||
340 | /* | |
341 | * rename and move the name cell. | |
342 | */ | |
1da177e4 LT |
343 | list_del(&hc->name_list); |
344 | old_name = hc->name; | |
6076905b | 345 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 346 | hc->name = new_name; |
6076905b | 347 | mutex_unlock(&dm_hash_cells_mutex); |
1da177e4 LT |
348 | list_add(&hc->name_list, _name_buckets + hash_str(new_name)); |
349 | ||
81f1777a | 350 | /* |
351 | * Wake up any dm event waiters. | |
352 | */ | |
7c666411 | 353 | table = dm_get_live_table(hc->md); |
81f1777a | 354 | if (table) { |
355 | dm_table_event(table); | |
356 | dm_table_put(table); | |
357 | } | |
358 | ||
856a6f1d PR |
359 | if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, param->event_nr)) |
360 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
69267a30 | 361 | |
856a6f1d | 362 | md = hc->md; |
1da177e4 LT |
363 | up_write(&_hash_lock); |
364 | kfree(old_name); | |
856a6f1d PR |
365 | |
366 | return md; | |
1da177e4 LT |
367 | } |
368 | ||
369 | /*----------------------------------------------------------------- | |
370 | * Implementation of the ioctl commands | |
371 | *---------------------------------------------------------------*/ | |
372 | /* | |
373 | * All the ioctl commands get dispatched to functions with this | |
374 | * prototype. | |
375 | */ | |
376 | typedef int (*ioctl_fn)(struct dm_ioctl *param, size_t param_size); | |
377 | ||
378 | static int remove_all(struct dm_ioctl *param, size_t param_size) | |
379 | { | |
5c6bd75d | 380 | dm_hash_remove_all(1); |
1da177e4 LT |
381 | param->data_size = 0; |
382 | return 0; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Round up the ptr to an 8-byte boundary. | |
387 | */ | |
388 | #define ALIGN_MASK 7 | |
389 | static inline void *align_ptr(void *ptr) | |
390 | { | |
391 | return (void *) (((size_t) (ptr + ALIGN_MASK)) & ~ALIGN_MASK); | |
392 | } | |
393 | ||
394 | /* | |
395 | * Retrieves the data payload buffer from an already allocated | |
396 | * struct dm_ioctl. | |
397 | */ | |
398 | static void *get_result_buffer(struct dm_ioctl *param, size_t param_size, | |
399 | size_t *len) | |
400 | { | |
401 | param->data_start = align_ptr(param + 1) - (void *) param; | |
402 | ||
403 | if (param->data_start < param_size) | |
404 | *len = param_size - param->data_start; | |
405 | else | |
406 | *len = 0; | |
407 | ||
408 | return ((void *) param) + param->data_start; | |
409 | } | |
410 | ||
411 | static int list_devices(struct dm_ioctl *param, size_t param_size) | |
412 | { | |
413 | unsigned int i; | |
414 | struct hash_cell *hc; | |
415 | size_t len, needed = 0; | |
416 | struct gendisk *disk; | |
417 | struct dm_name_list *nl, *old_nl = NULL; | |
418 | ||
419 | down_write(&_hash_lock); | |
420 | ||
421 | /* | |
422 | * Loop through all the devices working out how much | |
423 | * space we need. | |
424 | */ | |
425 | for (i = 0; i < NUM_BUCKETS; i++) { | |
426 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
427 | needed += sizeof(struct dm_name_list); | |
428 | needed += strlen(hc->name) + 1; | |
429 | needed += ALIGN_MASK; | |
430 | } | |
431 | } | |
432 | ||
433 | /* | |
434 | * Grab our output buffer. | |
435 | */ | |
436 | nl = get_result_buffer(param, param_size, &len); | |
437 | if (len < needed) { | |
438 | param->flags |= DM_BUFFER_FULL_FLAG; | |
439 | goto out; | |
440 | } | |
441 | param->data_size = param->data_start + needed; | |
442 | ||
443 | nl->dev = 0; /* Flags no data */ | |
444 | ||
445 | /* | |
446 | * Now loop through filling out the names. | |
447 | */ | |
448 | for (i = 0; i < NUM_BUCKETS; i++) { | |
449 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
450 | if (old_nl) | |
451 | old_nl->next = (uint32_t) ((void *) nl - | |
452 | (void *) old_nl); | |
453 | disk = dm_disk(hc->md); | |
f331c029 | 454 | nl->dev = huge_encode_dev(disk_devt(disk)); |
1da177e4 LT |
455 | nl->next = 0; |
456 | strcpy(nl->name, hc->name); | |
457 | ||
458 | old_nl = nl; | |
459 | nl = align_ptr(((void *) ++nl) + strlen(hc->name) + 1); | |
460 | } | |
461 | } | |
462 | ||
463 | out: | |
464 | up_write(&_hash_lock); | |
465 | return 0; | |
466 | } | |
467 | ||
468 | static void list_version_get_needed(struct target_type *tt, void *needed_param) | |
469 | { | |
470 | size_t *needed = needed_param; | |
471 | ||
c4cc6635 | 472 | *needed += sizeof(struct dm_target_versions); |
1da177e4 | 473 | *needed += strlen(tt->name); |
1da177e4 LT |
474 | *needed += ALIGN_MASK; |
475 | } | |
476 | ||
477 | static void list_version_get_info(struct target_type *tt, void *param) | |
478 | { | |
479 | struct vers_iter *info = param; | |
480 | ||
481 | /* Check space - it might have changed since the first iteration */ | |
482 | if ((char *)info->vers + sizeof(tt->version) + strlen(tt->name) + 1 > | |
483 | info->end) { | |
484 | ||
485 | info->flags = DM_BUFFER_FULL_FLAG; | |
486 | return; | |
487 | } | |
488 | ||
489 | if (info->old_vers) | |
490 | info->old_vers->next = (uint32_t) ((void *)info->vers - | |
491 | (void *)info->old_vers); | |
492 | info->vers->version[0] = tt->version[0]; | |
493 | info->vers->version[1] = tt->version[1]; | |
494 | info->vers->version[2] = tt->version[2]; | |
495 | info->vers->next = 0; | |
496 | strcpy(info->vers->name, tt->name); | |
497 | ||
498 | info->old_vers = info->vers; | |
499 | info->vers = align_ptr(((void *) ++info->vers) + strlen(tt->name) + 1); | |
500 | } | |
501 | ||
502 | static int list_versions(struct dm_ioctl *param, size_t param_size) | |
503 | { | |
504 | size_t len, needed = 0; | |
505 | struct dm_target_versions *vers; | |
506 | struct vers_iter iter_info; | |
507 | ||
508 | /* | |
509 | * Loop through all the devices working out how much | |
510 | * space we need. | |
511 | */ | |
512 | dm_target_iterate(list_version_get_needed, &needed); | |
513 | ||
514 | /* | |
515 | * Grab our output buffer. | |
516 | */ | |
517 | vers = get_result_buffer(param, param_size, &len); | |
518 | if (len < needed) { | |
519 | param->flags |= DM_BUFFER_FULL_FLAG; | |
520 | goto out; | |
521 | } | |
522 | param->data_size = param->data_start + needed; | |
523 | ||
524 | iter_info.param_size = param_size; | |
525 | iter_info.old_vers = NULL; | |
526 | iter_info.vers = vers; | |
527 | iter_info.flags = 0; | |
528 | iter_info.end = (char *)vers+len; | |
529 | ||
530 | /* | |
531 | * Now loop through filling out the names & versions. | |
532 | */ | |
533 | dm_target_iterate(list_version_get_info, &iter_info); | |
534 | param->flags |= iter_info.flags; | |
535 | ||
536 | out: | |
537 | return 0; | |
538 | } | |
539 | ||
1da177e4 LT |
540 | static int check_name(const char *name) |
541 | { | |
542 | if (strchr(name, '/')) { | |
543 | DMWARN("invalid device name"); | |
544 | return -EINVAL; | |
545 | } | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
1d0f3ce8 MS |
550 | /* |
551 | * On successful return, the caller must not attempt to acquire | |
552 | * _hash_lock without first calling dm_table_put, because dm_table_destroy | |
553 | * waits for this dm_table_put and could be called under this lock. | |
554 | */ | |
555 | static struct dm_table *dm_get_inactive_table(struct mapped_device *md) | |
556 | { | |
557 | struct hash_cell *hc; | |
558 | struct dm_table *table = NULL; | |
559 | ||
560 | down_read(&_hash_lock); | |
561 | hc = dm_get_mdptr(md); | |
562 | if (!hc || hc->md != md) { | |
563 | DMWARN("device has been removed from the dev hash table."); | |
564 | goto out; | |
565 | } | |
566 | ||
567 | table = hc->new_map; | |
568 | if (table) | |
569 | dm_table_get(table); | |
570 | ||
571 | out: | |
572 | up_read(&_hash_lock); | |
573 | ||
574 | return table; | |
575 | } | |
576 | ||
577 | static struct dm_table *dm_get_live_or_inactive_table(struct mapped_device *md, | |
578 | struct dm_ioctl *param) | |
579 | { | |
580 | return (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) ? | |
581 | dm_get_inactive_table(md) : dm_get_live_table(md); | |
582 | } | |
583 | ||
1da177e4 LT |
584 | /* |
585 | * Fills in a dm_ioctl structure, ready for sending back to | |
586 | * userland. | |
587 | */ | |
094ea9a0 | 588 | static void __dev_status(struct mapped_device *md, struct dm_ioctl *param) |
1da177e4 LT |
589 | { |
590 | struct gendisk *disk = dm_disk(md); | |
591 | struct dm_table *table; | |
1da177e4 LT |
592 | |
593 | param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG | | |
594 | DM_ACTIVE_PRESENT_FLAG); | |
595 | ||
4f186f8b | 596 | if (dm_suspended_md(md)) |
1da177e4 LT |
597 | param->flags |= DM_SUSPEND_FLAG; |
598 | ||
f331c029 | 599 | param->dev = huge_encode_dev(disk_devt(disk)); |
1da177e4 | 600 | |
5c6bd75d AK |
601 | /* |
602 | * Yes, this will be out of date by the time it gets back | |
603 | * to userland, but it is still very useful for | |
604 | * debugging. | |
605 | */ | |
606 | param->open_count = dm_open_count(md); | |
1da177e4 | 607 | |
1da177e4 | 608 | param->event_nr = dm_get_event_nr(md); |
1d0f3ce8 | 609 | param->target_count = 0; |
1da177e4 | 610 | |
7c666411 | 611 | table = dm_get_live_table(md); |
1da177e4 | 612 | if (table) { |
1d0f3ce8 MS |
613 | if (!(param->flags & DM_QUERY_INACTIVE_TABLE_FLAG)) { |
614 | if (get_disk_ro(disk)) | |
615 | param->flags |= DM_READONLY_FLAG; | |
616 | param->target_count = dm_table_get_num_targets(table); | |
617 | } | |
1da177e4 | 618 | dm_table_put(table); |
1d0f3ce8 MS |
619 | |
620 | param->flags |= DM_ACTIVE_PRESENT_FLAG; | |
621 | } | |
622 | ||
623 | if (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) { | |
624 | table = dm_get_inactive_table(md); | |
625 | if (table) { | |
626 | if (!(dm_table_get_mode(table) & FMODE_WRITE)) | |
627 | param->flags |= DM_READONLY_FLAG; | |
628 | param->target_count = dm_table_get_num_targets(table); | |
629 | dm_table_put(table); | |
630 | } | |
631 | } | |
1da177e4 LT |
632 | } |
633 | ||
634 | static int dev_create(struct dm_ioctl *param, size_t param_size) | |
635 | { | |
2b06cfff | 636 | int r, m = DM_ANY_MINOR; |
1da177e4 LT |
637 | struct mapped_device *md; |
638 | ||
639 | r = check_name(param->name); | |
640 | if (r) | |
641 | return r; | |
642 | ||
643 | if (param->flags & DM_PERSISTENT_DEV_FLAG) | |
2b06cfff | 644 | m = MINOR(huge_decode_dev(param->dev)); |
1da177e4 | 645 | |
2b06cfff | 646 | r = dm_create(m, &md); |
1da177e4 LT |
647 | if (r) |
648 | return r; | |
649 | ||
650 | r = dm_hash_insert(param->name, *param->uuid ? param->uuid : NULL, md); | |
3f77316d KU |
651 | if (r) { |
652 | dm_put(md); | |
653 | dm_destroy(md); | |
654 | return r; | |
655 | } | |
1da177e4 LT |
656 | |
657 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
658 | ||
094ea9a0 AK |
659 | __dev_status(md, param); |
660 | ||
1da177e4 LT |
661 | dm_put(md); |
662 | ||
3f77316d | 663 | return 0; |
1da177e4 LT |
664 | } |
665 | ||
666 | /* | |
667 | * Always use UUID for lookups if it's present, otherwise use name or dev. | |
668 | */ | |
858119e1 | 669 | static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) |
1da177e4 | 670 | { |
9ade92a9 AK |
671 | struct mapped_device *md; |
672 | void *mdptr = NULL; | |
673 | ||
1da177e4 LT |
674 | if (*param->uuid) |
675 | return __get_uuid_cell(param->uuid); | |
9ade92a9 AK |
676 | |
677 | if (*param->name) | |
1da177e4 | 678 | return __get_name_cell(param->name); |
9ade92a9 AK |
679 | |
680 | md = dm_get_md(huge_decode_dev(param->dev)); | |
bfc5ecdf AK |
681 | if (!md) |
682 | goto out; | |
683 | ||
684 | mdptr = dm_get_mdptr(md); | |
685 | if (!mdptr) | |
686 | dm_put(md); | |
9ade92a9 | 687 | |
bfc5ecdf | 688 | out: |
9ade92a9 | 689 | return mdptr; |
1da177e4 LT |
690 | } |
691 | ||
858119e1 | 692 | static struct mapped_device *find_device(struct dm_ioctl *param) |
1da177e4 LT |
693 | { |
694 | struct hash_cell *hc; | |
695 | struct mapped_device *md = NULL; | |
696 | ||
697 | down_read(&_hash_lock); | |
698 | hc = __find_device_hash_cell(param); | |
699 | if (hc) { | |
700 | md = hc->md; | |
1da177e4 LT |
701 | |
702 | /* | |
703 | * Sneakily write in both the name and the uuid | |
704 | * while we have the cell. | |
705 | */ | |
a518b86d | 706 | strlcpy(param->name, hc->name, sizeof(param->name)); |
1da177e4 | 707 | if (hc->uuid) |
a518b86d | 708 | strlcpy(param->uuid, hc->uuid, sizeof(param->uuid)); |
1da177e4 LT |
709 | else |
710 | param->uuid[0] = '\0'; | |
711 | ||
712 | if (hc->new_map) | |
713 | param->flags |= DM_INACTIVE_PRESENT_FLAG; | |
714 | else | |
715 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
716 | } | |
717 | up_read(&_hash_lock); | |
718 | ||
719 | return md; | |
720 | } | |
721 | ||
722 | static int dev_remove(struct dm_ioctl *param, size_t param_size) | |
723 | { | |
724 | struct hash_cell *hc; | |
7ec75f25 | 725 | struct mapped_device *md; |
5c6bd75d | 726 | int r; |
1da177e4 LT |
727 | |
728 | down_write(&_hash_lock); | |
729 | hc = __find_device_hash_cell(param); | |
730 | ||
731 | if (!hc) { | |
732 | DMWARN("device doesn't appear to be in the dev hash table."); | |
733 | up_write(&_hash_lock); | |
734 | return -ENXIO; | |
735 | } | |
736 | ||
7ec75f25 JM |
737 | md = hc->md; |
738 | ||
5c6bd75d AK |
739 | /* |
740 | * Ensure the device is not open and nothing further can open it. | |
741 | */ | |
742 | r = dm_lock_for_deletion(md); | |
743 | if (r) { | |
744 | DMWARN("unable to remove open device %s", hc->name); | |
745 | up_write(&_hash_lock); | |
746 | dm_put(md); | |
747 | return r; | |
748 | } | |
749 | ||
1da177e4 LT |
750 | __hash_remove(hc); |
751 | up_write(&_hash_lock); | |
60935eb2 | 752 | |
3abf85b5 PR |
753 | if (!dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr)) |
754 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
60935eb2 | 755 | |
7ec75f25 | 756 | dm_put(md); |
3f77316d | 757 | dm_destroy(md); |
1da177e4 LT |
758 | return 0; |
759 | } | |
760 | ||
761 | /* | |
762 | * Check a string doesn't overrun the chunk of | |
763 | * memory we copied from userland. | |
764 | */ | |
765 | static int invalid_str(char *str, void *end) | |
766 | { | |
767 | while ((void *) str < end) | |
768 | if (!*str++) | |
769 | return 0; | |
770 | ||
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | static int dev_rename(struct dm_ioctl *param, size_t param_size) | |
775 | { | |
776 | int r; | |
777 | char *new_name = (char *) param + param->data_start; | |
856a6f1d | 778 | struct mapped_device *md; |
1da177e4 | 779 | |
27238b2b | 780 | if (new_name < param->data || |
bc0fd67f MB |
781 | invalid_str(new_name, (void *) param + param_size) || |
782 | strlen(new_name) > DM_NAME_LEN - 1) { | |
1da177e4 LT |
783 | DMWARN("Invalid new logical volume name supplied."); |
784 | return -EINVAL; | |
785 | } | |
786 | ||
787 | r = check_name(new_name); | |
788 | if (r) | |
789 | return r; | |
790 | ||
856a6f1d PR |
791 | md = dm_hash_rename(param, new_name); |
792 | if (IS_ERR(md)) | |
793 | return PTR_ERR(md); | |
3abf85b5 | 794 | |
856a6f1d PR |
795 | __dev_status(md, param); |
796 | dm_put(md); | |
797 | ||
798 | return 0; | |
1da177e4 LT |
799 | } |
800 | ||
3ac51e74 DW |
801 | static int dev_set_geometry(struct dm_ioctl *param, size_t param_size) |
802 | { | |
803 | int r = -EINVAL, x; | |
804 | struct mapped_device *md; | |
805 | struct hd_geometry geometry; | |
806 | unsigned long indata[4]; | |
807 | char *geostr = (char *) param + param->data_start; | |
808 | ||
809 | md = find_device(param); | |
810 | if (!md) | |
811 | return -ENXIO; | |
812 | ||
27238b2b | 813 | if (geostr < param->data || |
3ac51e74 DW |
814 | invalid_str(geostr, (void *) param + param_size)) { |
815 | DMWARN("Invalid geometry supplied."); | |
816 | goto out; | |
817 | } | |
818 | ||
819 | x = sscanf(geostr, "%lu %lu %lu %lu", indata, | |
820 | indata + 1, indata + 2, indata + 3); | |
821 | ||
822 | if (x != 4) { | |
823 | DMWARN("Unable to interpret geometry settings."); | |
824 | goto out; | |
825 | } | |
826 | ||
827 | if (indata[0] > 65535 || indata[1] > 255 || | |
828 | indata[2] > 255 || indata[3] > ULONG_MAX) { | |
829 | DMWARN("Geometry exceeds range limits."); | |
830 | goto out; | |
831 | } | |
832 | ||
833 | geometry.cylinders = indata[0]; | |
834 | geometry.heads = indata[1]; | |
835 | geometry.sectors = indata[2]; | |
836 | geometry.start = indata[3]; | |
837 | ||
838 | r = dm_set_geometry(md, &geometry); | |
3ac51e74 DW |
839 | |
840 | param->data_size = 0; | |
841 | ||
842 | out: | |
843 | dm_put(md); | |
844 | return r; | |
845 | } | |
846 | ||
1da177e4 LT |
847 | static int do_suspend(struct dm_ioctl *param) |
848 | { | |
849 | int r = 0; | |
a3d77d35 | 850 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
851 | struct mapped_device *md; |
852 | ||
853 | md = find_device(param); | |
854 | if (!md) | |
855 | return -ENXIO; | |
856 | ||
6da487dc | 857 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 858 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
859 | if (param->flags & DM_NOFLUSH_FLAG) |
860 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
6da487dc | 861 | |
094ea9a0 | 862 | if (!dm_suspended_md(md)) { |
a3d77d35 | 863 | r = dm_suspend(md, suspend_flags); |
094ea9a0 AK |
864 | if (r) |
865 | goto out; | |
866 | } | |
1da177e4 | 867 | |
094ea9a0 | 868 | __dev_status(md, param); |
1da177e4 | 869 | |
094ea9a0 | 870 | out: |
1da177e4 | 871 | dm_put(md); |
094ea9a0 | 872 | |
1da177e4 LT |
873 | return r; |
874 | } | |
875 | ||
876 | static int do_resume(struct dm_ioctl *param) | |
877 | { | |
878 | int r = 0; | |
a3d77d35 | 879 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
880 | struct hash_cell *hc; |
881 | struct mapped_device *md; | |
042d2a9b | 882 | struct dm_table *new_map, *old_map = NULL; |
1da177e4 LT |
883 | |
884 | down_write(&_hash_lock); | |
885 | ||
886 | hc = __find_device_hash_cell(param); | |
887 | if (!hc) { | |
888 | DMWARN("device doesn't appear to be in the dev hash table."); | |
889 | up_write(&_hash_lock); | |
890 | return -ENXIO; | |
891 | } | |
892 | ||
893 | md = hc->md; | |
1da177e4 LT |
894 | |
895 | new_map = hc->new_map; | |
896 | hc->new_map = NULL; | |
897 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
898 | ||
899 | up_write(&_hash_lock); | |
900 | ||
901 | /* Do we need to load a new map ? */ | |
902 | if (new_map) { | |
903 | /* Suspend if it isn't already suspended */ | |
6da487dc | 904 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 905 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
906 | if (param->flags & DM_NOFLUSH_FLAG) |
907 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
4f186f8b | 908 | if (!dm_suspended_md(md)) |
a3d77d35 | 909 | dm_suspend(md, suspend_flags); |
1da177e4 | 910 | |
042d2a9b AK |
911 | old_map = dm_swap_table(md, new_map); |
912 | if (IS_ERR(old_map)) { | |
d5816876 | 913 | dm_table_destroy(new_map); |
1da177e4 | 914 | dm_put(md); |
042d2a9b | 915 | return PTR_ERR(old_map); |
1da177e4 LT |
916 | } |
917 | ||
918 | if (dm_table_get_mode(new_map) & FMODE_WRITE) | |
919 | set_disk_ro(dm_disk(md), 0); | |
920 | else | |
921 | set_disk_ro(dm_disk(md), 1); | |
1da177e4 LT |
922 | } |
923 | ||
0f3649a9 | 924 | if (dm_suspended_md(md)) { |
1da177e4 | 925 | r = dm_resume(md); |
3abf85b5 PR |
926 | if (!r && !dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr)) |
927 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
0f3649a9 | 928 | } |
1da177e4 | 929 | |
042d2a9b AK |
930 | if (old_map) |
931 | dm_table_destroy(old_map); | |
60935eb2 | 932 | |
0f3649a9 | 933 | if (!r) |
094ea9a0 | 934 | __dev_status(md, param); |
1da177e4 LT |
935 | |
936 | dm_put(md); | |
937 | return r; | |
938 | } | |
939 | ||
940 | /* | |
941 | * Set or unset the suspension state of a device. | |
942 | * If the device already is in the requested state we just return its status. | |
943 | */ | |
944 | static int dev_suspend(struct dm_ioctl *param, size_t param_size) | |
945 | { | |
946 | if (param->flags & DM_SUSPEND_FLAG) | |
947 | return do_suspend(param); | |
948 | ||
949 | return do_resume(param); | |
950 | } | |
951 | ||
952 | /* | |
953 | * Copies device info back to user space, used by | |
954 | * the create and info ioctls. | |
955 | */ | |
956 | static int dev_status(struct dm_ioctl *param, size_t param_size) | |
957 | { | |
1da177e4 LT |
958 | struct mapped_device *md; |
959 | ||
960 | md = find_device(param); | |
961 | if (!md) | |
962 | return -ENXIO; | |
963 | ||
094ea9a0 | 964 | __dev_status(md, param); |
1da177e4 | 965 | dm_put(md); |
094ea9a0 AK |
966 | |
967 | return 0; | |
1da177e4 LT |
968 | } |
969 | ||
970 | /* | |
971 | * Build up the status struct for each target | |
972 | */ | |
973 | static void retrieve_status(struct dm_table *table, | |
974 | struct dm_ioctl *param, size_t param_size) | |
975 | { | |
976 | unsigned int i, num_targets; | |
977 | struct dm_target_spec *spec; | |
978 | char *outbuf, *outptr; | |
979 | status_type_t type; | |
980 | size_t remaining, len, used = 0; | |
981 | ||
982 | outptr = outbuf = get_result_buffer(param, param_size, &len); | |
983 | ||
984 | if (param->flags & DM_STATUS_TABLE_FLAG) | |
985 | type = STATUSTYPE_TABLE; | |
986 | else | |
987 | type = STATUSTYPE_INFO; | |
988 | ||
989 | /* Get all the target info */ | |
990 | num_targets = dm_table_get_num_targets(table); | |
991 | for (i = 0; i < num_targets; i++) { | |
992 | struct dm_target *ti = dm_table_get_target(table, i); | |
993 | ||
994 | remaining = len - (outptr - outbuf); | |
995 | if (remaining <= sizeof(struct dm_target_spec)) { | |
996 | param->flags |= DM_BUFFER_FULL_FLAG; | |
997 | break; | |
998 | } | |
999 | ||
1000 | spec = (struct dm_target_spec *) outptr; | |
1001 | ||
1002 | spec->status = 0; | |
1003 | spec->sector_start = ti->begin; | |
1004 | spec->length = ti->len; | |
1005 | strncpy(spec->target_type, ti->type->name, | |
1006 | sizeof(spec->target_type)); | |
1007 | ||
1008 | outptr += sizeof(struct dm_target_spec); | |
1009 | remaining = len - (outptr - outbuf); | |
1010 | if (remaining <= 0) { | |
1011 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1012 | break; | |
1013 | } | |
1014 | ||
1015 | /* Get the status/table string from the target driver */ | |
1016 | if (ti->type->status) { | |
1017 | if (ti->type->status(ti, type, outptr, remaining)) { | |
1018 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1019 | break; | |
1020 | } | |
1021 | } else | |
1022 | outptr[0] = '\0'; | |
1023 | ||
1024 | outptr += strlen(outptr) + 1; | |
1025 | used = param->data_start + (outptr - outbuf); | |
1026 | ||
1027 | outptr = align_ptr(outptr); | |
1028 | spec->next = outptr - outbuf; | |
1029 | } | |
1030 | ||
1031 | if (used) | |
1032 | param->data_size = used; | |
1033 | ||
1034 | param->target_count = num_targets; | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * Wait for a device to report an event | |
1039 | */ | |
1040 | static int dev_wait(struct dm_ioctl *param, size_t param_size) | |
1041 | { | |
094ea9a0 | 1042 | int r = 0; |
1da177e4 LT |
1043 | struct mapped_device *md; |
1044 | struct dm_table *table; | |
1045 | ||
1046 | md = find_device(param); | |
1047 | if (!md) | |
1048 | return -ENXIO; | |
1049 | ||
1050 | /* | |
1051 | * Wait for a notification event | |
1052 | */ | |
1053 | if (dm_wait_event(md, param->event_nr)) { | |
1054 | r = -ERESTARTSYS; | |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * The userland program is going to want to know what | |
1060 | * changed to trigger the event, so we may as well tell | |
1061 | * him and save an ioctl. | |
1062 | */ | |
094ea9a0 | 1063 | __dev_status(md, param); |
1da177e4 | 1064 | |
1d0f3ce8 | 1065 | table = dm_get_live_or_inactive_table(md, param); |
1da177e4 LT |
1066 | if (table) { |
1067 | retrieve_status(table, param, param_size); | |
1068 | dm_table_put(table); | |
1069 | } | |
1070 | ||
094ea9a0 | 1071 | out: |
1da177e4 | 1072 | dm_put(md); |
094ea9a0 | 1073 | |
1da177e4 LT |
1074 | return r; |
1075 | } | |
1076 | ||
aeb5d727 | 1077 | static inline fmode_t get_mode(struct dm_ioctl *param) |
1da177e4 | 1078 | { |
aeb5d727 | 1079 | fmode_t mode = FMODE_READ | FMODE_WRITE; |
1da177e4 LT |
1080 | |
1081 | if (param->flags & DM_READONLY_FLAG) | |
1082 | mode = FMODE_READ; | |
1083 | ||
1084 | return mode; | |
1085 | } | |
1086 | ||
1087 | static int next_target(struct dm_target_spec *last, uint32_t next, void *end, | |
1088 | struct dm_target_spec **spec, char **target_params) | |
1089 | { | |
1090 | *spec = (struct dm_target_spec *) ((unsigned char *) last + next); | |
1091 | *target_params = (char *) (*spec + 1); | |
1092 | ||
1093 | if (*spec < (last + 1)) | |
1094 | return -EINVAL; | |
1095 | ||
1096 | return invalid_str(*target_params, end); | |
1097 | } | |
1098 | ||
1099 | static int populate_table(struct dm_table *table, | |
1100 | struct dm_ioctl *param, size_t param_size) | |
1101 | { | |
1102 | int r; | |
1103 | unsigned int i = 0; | |
1104 | struct dm_target_spec *spec = (struct dm_target_spec *) param; | |
1105 | uint32_t next = param->data_start; | |
1106 | void *end = (void *) param + param_size; | |
1107 | char *target_params; | |
1108 | ||
1109 | if (!param->target_count) { | |
1110 | DMWARN("populate_table: no targets specified"); | |
1111 | return -EINVAL; | |
1112 | } | |
1113 | ||
1114 | for (i = 0; i < param->target_count; i++) { | |
1115 | ||
1116 | r = next_target(spec, next, end, &spec, &target_params); | |
1117 | if (r) { | |
1118 | DMWARN("unable to find target"); | |
1119 | return r; | |
1120 | } | |
1121 | ||
1122 | r = dm_table_add_target(table, spec->target_type, | |
1123 | (sector_t) spec->sector_start, | |
1124 | (sector_t) spec->length, | |
1125 | target_params); | |
1126 | if (r) { | |
1127 | DMWARN("error adding target to table"); | |
1128 | return r; | |
1129 | } | |
1130 | ||
1131 | next = spec->next; | |
1132 | } | |
1133 | ||
1134 | return dm_table_complete(table); | |
1135 | } | |
1136 | ||
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 | ||
4a0b4ddf | 1158 | /* Protect md->type and md->queue against concurrent table loads. */ |
a5664dad MS |
1159 | dm_lock_md_type(md); |
1160 | if (dm_get_md_type(md) == DM_TYPE_NONE) | |
1161 | /* Initial table load: acquire type of table. */ | |
1162 | dm_set_md_type(md, dm_table_get_type(t)); | |
1163 | else if (dm_get_md_type(md) != dm_table_get_type(t)) { | |
1164 | DMWARN("can't change device type after initial table load."); | |
1165 | dm_table_destroy(t); | |
1166 | dm_unlock_md_type(md); | |
1167 | r = -EINVAL; | |
1168 | goto out; | |
1169 | } | |
4a0b4ddf MS |
1170 | |
1171 | /* setup md->queue to reflect md's type (may block) */ | |
1172 | r = dm_setup_md_queue(md); | |
1173 | if (r) { | |
1174 | DMWARN("unable to set up device queue for new table."); | |
1175 | dm_table_destroy(t); | |
1176 | dm_unlock_md_type(md); | |
1177 | goto out; | |
1178 | } | |
a5664dad MS |
1179 | dm_unlock_md_type(md); |
1180 | ||
1181 | /* stage inactive table */ | |
1da177e4 | 1182 | down_write(&_hash_lock); |
1134e5ae MA |
1183 | hc = dm_get_mdptr(md); |
1184 | if (!hc || hc->md != md) { | |
1185 | DMWARN("device has been removed from the dev hash table."); | |
f80a5570 | 1186 | dm_table_destroy(t); |
1134e5ae MA |
1187 | up_write(&_hash_lock); |
1188 | r = -ENXIO; | |
1189 | goto out; | |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | if (hc->new_map) | |
d5816876 | 1193 | dm_table_destroy(hc->new_map); |
1da177e4 | 1194 | hc->new_map = t; |
1134e5ae MA |
1195 | up_write(&_hash_lock); |
1196 | ||
1da177e4 | 1197 | param->flags |= DM_INACTIVE_PRESENT_FLAG; |
094ea9a0 | 1198 | __dev_status(md, param); |
1134e5ae MA |
1199 | |
1200 | out: | |
1201 | dm_put(md); | |
1da177e4 | 1202 | |
1da177e4 LT |
1203 | return r; |
1204 | } | |
1205 | ||
1206 | static int table_clear(struct dm_ioctl *param, size_t param_size) | |
1207 | { | |
1da177e4 | 1208 | struct hash_cell *hc; |
7ec75f25 | 1209 | struct mapped_device *md; |
1da177e4 LT |
1210 | |
1211 | down_write(&_hash_lock); | |
1212 | ||
1213 | hc = __find_device_hash_cell(param); | |
1214 | if (!hc) { | |
1215 | DMWARN("device doesn't appear to be in the dev hash table."); | |
1216 | up_write(&_hash_lock); | |
1217 | return -ENXIO; | |
1218 | } | |
1219 | ||
1220 | if (hc->new_map) { | |
d5816876 | 1221 | dm_table_destroy(hc->new_map); |
1da177e4 LT |
1222 | hc->new_map = NULL; |
1223 | } | |
1224 | ||
1225 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
1226 | ||
094ea9a0 | 1227 | __dev_status(hc->md, param); |
7ec75f25 | 1228 | md = hc->md; |
1da177e4 | 1229 | up_write(&_hash_lock); |
7ec75f25 | 1230 | dm_put(md); |
094ea9a0 AK |
1231 | |
1232 | return 0; | |
1da177e4 LT |
1233 | } |
1234 | ||
1235 | /* | |
1236 | * Retrieves a list of devices used by a particular dm device. | |
1237 | */ | |
1238 | static void retrieve_deps(struct dm_table *table, | |
1239 | struct dm_ioctl *param, size_t param_size) | |
1240 | { | |
1241 | unsigned int count = 0; | |
1242 | struct list_head *tmp; | |
1243 | size_t len, needed; | |
82b1519b | 1244 | struct dm_dev_internal *dd; |
1da177e4 LT |
1245 | struct dm_target_deps *deps; |
1246 | ||
1247 | deps = get_result_buffer(param, param_size, &len); | |
1248 | ||
1249 | /* | |
1250 | * Count the devices. | |
1251 | */ | |
1252 | list_for_each (tmp, dm_table_get_devices(table)) | |
1253 | count++; | |
1254 | ||
1255 | /* | |
1256 | * Check we have enough space. | |
1257 | */ | |
1258 | needed = sizeof(*deps) + (sizeof(*deps->dev) * count); | |
1259 | if (len < needed) { | |
1260 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1261 | return; | |
1262 | } | |
1263 | ||
1264 | /* | |
1265 | * Fill in the devices. | |
1266 | */ | |
1267 | deps->count = count; | |
1268 | count = 0; | |
1269 | list_for_each_entry (dd, dm_table_get_devices(table), list) | |
82b1519b | 1270 | deps->dev[count++] = huge_encode_dev(dd->dm_dev.bdev->bd_dev); |
1da177e4 LT |
1271 | |
1272 | param->data_size = param->data_start + needed; | |
1273 | } | |
1274 | ||
1275 | static int table_deps(struct dm_ioctl *param, size_t param_size) | |
1276 | { | |
1da177e4 LT |
1277 | struct mapped_device *md; |
1278 | struct dm_table *table; | |
1279 | ||
1280 | md = find_device(param); | |
1281 | if (!md) | |
1282 | return -ENXIO; | |
1283 | ||
094ea9a0 | 1284 | __dev_status(md, param); |
1da177e4 | 1285 | |
1d0f3ce8 | 1286 | table = dm_get_live_or_inactive_table(md, param); |
1da177e4 LT |
1287 | if (table) { |
1288 | retrieve_deps(table, param, param_size); | |
1289 | dm_table_put(table); | |
1290 | } | |
1291 | ||
1da177e4 | 1292 | dm_put(md); |
094ea9a0 AK |
1293 | |
1294 | return 0; | |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | /* | |
1298 | * Return the status of a device as a text string for each | |
1299 | * target. | |
1300 | */ | |
1301 | static int table_status(struct dm_ioctl *param, size_t param_size) | |
1302 | { | |
1da177e4 LT |
1303 | struct mapped_device *md; |
1304 | struct dm_table *table; | |
1305 | ||
1306 | md = find_device(param); | |
1307 | if (!md) | |
1308 | return -ENXIO; | |
1309 | ||
094ea9a0 | 1310 | __dev_status(md, param); |
1da177e4 | 1311 | |
1d0f3ce8 | 1312 | table = dm_get_live_or_inactive_table(md, param); |
1da177e4 LT |
1313 | if (table) { |
1314 | retrieve_status(table, param, param_size); | |
1315 | dm_table_put(table); | |
1316 | } | |
1317 | ||
1da177e4 | 1318 | dm_put(md); |
094ea9a0 AK |
1319 | |
1320 | return 0; | |
1da177e4 LT |
1321 | } |
1322 | ||
1323 | /* | |
1324 | * Pass a message to the target that's at the supplied device offset. | |
1325 | */ | |
1326 | static int target_message(struct dm_ioctl *param, size_t param_size) | |
1327 | { | |
1328 | int r, argc; | |
1329 | char **argv; | |
1330 | struct mapped_device *md; | |
1331 | struct dm_table *table; | |
1332 | struct dm_target *ti; | |
1333 | struct dm_target_msg *tmsg = (void *) param + param->data_start; | |
1334 | ||
1335 | md = find_device(param); | |
1336 | if (!md) | |
1337 | return -ENXIO; | |
1338 | ||
027d50f9 | 1339 | if (tmsg < (struct dm_target_msg *) param->data || |
1da177e4 LT |
1340 | invalid_str(tmsg->message, (void *) param + param_size)) { |
1341 | DMWARN("Invalid target message parameters."); | |
1342 | r = -EINVAL; | |
1343 | goto out; | |
1344 | } | |
1345 | ||
1346 | r = dm_split_args(&argc, &argv, tmsg->message); | |
1347 | if (r) { | |
1348 | DMWARN("Failed to split target message parameters"); | |
1349 | goto out; | |
1350 | } | |
1351 | ||
7c666411 | 1352 | table = dm_get_live_table(md); |
1da177e4 LT |
1353 | if (!table) |
1354 | goto out_argv; | |
1355 | ||
c50abeb3 MA |
1356 | if (dm_deleting_md(md)) { |
1357 | r = -ENXIO; | |
1358 | goto out_table; | |
1359 | } | |
1360 | ||
512875bd JN |
1361 | ti = dm_table_find_target(table, tmsg->sector); |
1362 | if (!dm_target_is_valid(ti)) { | |
1da177e4 LT |
1363 | DMWARN("Target message sector outside device."); |
1364 | r = -EINVAL; | |
512875bd | 1365 | } else if (ti->type->message) |
1da177e4 LT |
1366 | r = ti->type->message(ti, argc, argv); |
1367 | else { | |
1368 | DMWARN("Target type does not support messages"); | |
1369 | r = -EINVAL; | |
1370 | } | |
1371 | ||
c50abeb3 | 1372 | out_table: |
1da177e4 LT |
1373 | dm_table_put(table); |
1374 | out_argv: | |
1375 | kfree(argv); | |
1376 | out: | |
1377 | param->data_size = 0; | |
1378 | dm_put(md); | |
1379 | return r; | |
1380 | } | |
1381 | ||
1382 | /*----------------------------------------------------------------- | |
1383 | * Implementation of open/close/ioctl on the special char | |
1384 | * device. | |
1385 | *---------------------------------------------------------------*/ | |
1386 | static ioctl_fn lookup_ioctl(unsigned int cmd) | |
1387 | { | |
1388 | static struct { | |
1389 | int cmd; | |
1390 | ioctl_fn fn; | |
1391 | } _ioctls[] = { | |
1392 | {DM_VERSION_CMD, NULL}, /* version is dealt with elsewhere */ | |
1393 | {DM_REMOVE_ALL_CMD, remove_all}, | |
1394 | {DM_LIST_DEVICES_CMD, list_devices}, | |
1395 | ||
1396 | {DM_DEV_CREATE_CMD, dev_create}, | |
1397 | {DM_DEV_REMOVE_CMD, dev_remove}, | |
1398 | {DM_DEV_RENAME_CMD, dev_rename}, | |
1399 | {DM_DEV_SUSPEND_CMD, dev_suspend}, | |
1400 | {DM_DEV_STATUS_CMD, dev_status}, | |
1401 | {DM_DEV_WAIT_CMD, dev_wait}, | |
1402 | ||
1403 | {DM_TABLE_LOAD_CMD, table_load}, | |
1404 | {DM_TABLE_CLEAR_CMD, table_clear}, | |
1405 | {DM_TABLE_DEPS_CMD, table_deps}, | |
1406 | {DM_TABLE_STATUS_CMD, table_status}, | |
1407 | ||
1408 | {DM_LIST_VERSIONS_CMD, list_versions}, | |
1409 | ||
3ac51e74 DW |
1410 | {DM_TARGET_MSG_CMD, target_message}, |
1411 | {DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry} | |
1da177e4 LT |
1412 | }; |
1413 | ||
1414 | return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn; | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * As well as checking the version compatibility this always | |
1419 | * copies the kernel interface version out. | |
1420 | */ | |
1421 | static int check_version(unsigned int cmd, struct dm_ioctl __user *user) | |
1422 | { | |
1423 | uint32_t version[3]; | |
1424 | int r = 0; | |
1425 | ||
1426 | if (copy_from_user(version, user->version, sizeof(version))) | |
1427 | return -EFAULT; | |
1428 | ||
1429 | if ((DM_VERSION_MAJOR != version[0]) || | |
1430 | (DM_VERSION_MINOR < version[1])) { | |
1431 | DMWARN("ioctl interface mismatch: " | |
1432 | "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)", | |
1433 | DM_VERSION_MAJOR, DM_VERSION_MINOR, | |
1434 | DM_VERSION_PATCHLEVEL, | |
1435 | version[0], version[1], version[2], cmd); | |
1436 | r = -EINVAL; | |
1437 | } | |
1438 | ||
1439 | /* | |
1440 | * Fill in the kernel version. | |
1441 | */ | |
1442 | version[0] = DM_VERSION_MAJOR; | |
1443 | version[1] = DM_VERSION_MINOR; | |
1444 | version[2] = DM_VERSION_PATCHLEVEL; | |
1445 | if (copy_to_user(user->version, version, sizeof(version))) | |
1446 | return -EFAULT; | |
1447 | ||
1448 | return r; | |
1449 | } | |
1450 | ||
1451 | static void free_params(struct dm_ioctl *param) | |
1452 | { | |
1453 | vfree(param); | |
1454 | } | |
1455 | ||
1456 | static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param) | |
1457 | { | |
1458 | struct dm_ioctl tmp, *dmi; | |
1459 | ||
76c072b4 | 1460 | if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data))) |
1da177e4 LT |
1461 | return -EFAULT; |
1462 | ||
76c072b4 | 1463 | if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data))) |
1da177e4 LT |
1464 | return -EINVAL; |
1465 | ||
bb56acf8 | 1466 | dmi = vmalloc(tmp.data_size); |
1da177e4 LT |
1467 | if (!dmi) |
1468 | return -ENOMEM; | |
1469 | ||
1470 | if (copy_from_user(dmi, user, tmp.data_size)) { | |
1471 | vfree(dmi); | |
1472 | return -EFAULT; | |
1473 | } | |
1474 | ||
1475 | *param = dmi; | |
1476 | return 0; | |
1477 | } | |
1478 | ||
1479 | static int validate_params(uint cmd, struct dm_ioctl *param) | |
1480 | { | |
1481 | /* Always clear this flag */ | |
1482 | param->flags &= ~DM_BUFFER_FULL_FLAG; | |
3abf85b5 | 1483 | param->flags &= ~DM_UEVENT_GENERATED_FLAG; |
1da177e4 LT |
1484 | |
1485 | /* Ignores parameters */ | |
1486 | if (cmd == DM_REMOVE_ALL_CMD || | |
1487 | cmd == DM_LIST_DEVICES_CMD || | |
1488 | cmd == DM_LIST_VERSIONS_CMD) | |
1489 | return 0; | |
1490 | ||
1491 | if ((cmd == DM_DEV_CREATE_CMD)) { | |
1492 | if (!*param->name) { | |
1493 | DMWARN("name not supplied when creating device"); | |
1494 | return -EINVAL; | |
1495 | } | |
1496 | } else if ((*param->uuid && *param->name)) { | |
1497 | DMWARN("only supply one of name or uuid, cmd(%u)", cmd); | |
1498 | return -EINVAL; | |
1499 | } | |
1500 | ||
1501 | /* Ensure strings are terminated */ | |
1502 | param->name[DM_NAME_LEN - 1] = '\0'; | |
1503 | param->uuid[DM_UUID_LEN - 1] = '\0'; | |
1504 | ||
1505 | return 0; | |
1506 | } | |
1507 | ||
27238b2b | 1508 | static int ctl_ioctl(uint command, struct dm_ioctl __user *user) |
1da177e4 LT |
1509 | { |
1510 | int r = 0; | |
1511 | unsigned int cmd; | |
a26ffd4a | 1512 | struct dm_ioctl *uninitialized_var(param); |
1da177e4 LT |
1513 | ioctl_fn fn = NULL; |
1514 | size_t param_size; | |
1515 | ||
1516 | /* only root can play with this */ | |
1517 | if (!capable(CAP_SYS_ADMIN)) | |
1518 | return -EACCES; | |
1519 | ||
1520 | if (_IOC_TYPE(command) != DM_IOCTL) | |
1521 | return -ENOTTY; | |
1522 | ||
1523 | cmd = _IOC_NR(command); | |
1524 | ||
1525 | /* | |
1526 | * Check the interface version passed in. This also | |
1527 | * writes out the kernel's interface version. | |
1528 | */ | |
1529 | r = check_version(cmd, user); | |
1530 | if (r) | |
1531 | return r; | |
1532 | ||
1533 | /* | |
1534 | * Nothing more to do for the version command. | |
1535 | */ | |
1536 | if (cmd == DM_VERSION_CMD) | |
1537 | return 0; | |
1538 | ||
1539 | fn = lookup_ioctl(cmd); | |
1540 | if (!fn) { | |
1541 | DMWARN("dm_ctl_ioctl: unknown command 0x%x", command); | |
1542 | return -ENOTTY; | |
1543 | } | |
1544 | ||
1545 | /* | |
1546 | * Trying to avoid low memory issues when a device is | |
1547 | * suspended. | |
1548 | */ | |
1549 | current->flags |= PF_MEMALLOC; | |
1550 | ||
1551 | /* | |
1552 | * Copy the parameters into kernel space. | |
1553 | */ | |
1554 | r = copy_params(user, ¶m); | |
1da177e4 | 1555 | |
dab6a429 AK |
1556 | current->flags &= ~PF_MEMALLOC; |
1557 | ||
1558 | if (r) | |
1559 | return r; | |
1da177e4 LT |
1560 | |
1561 | r = validate_params(cmd, param); | |
1562 | if (r) | |
1563 | goto out; | |
1564 | ||
1565 | param_size = param->data_size; | |
1566 | param->data_size = sizeof(*param); | |
1567 | r = fn(param, param_size); | |
1568 | ||
1569 | /* | |
1570 | * Copy the results back to userland. | |
1571 | */ | |
1572 | if (!r && copy_to_user(user, param, param->data_size)) | |
1573 | r = -EFAULT; | |
1574 | ||
1575 | out: | |
1576 | free_params(param); | |
1da177e4 LT |
1577 | return r; |
1578 | } | |
1579 | ||
27238b2b AK |
1580 | static long dm_ctl_ioctl(struct file *file, uint command, ulong u) |
1581 | { | |
1582 | return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u); | |
1583 | } | |
1584 | ||
76c072b4 MB |
1585 | #ifdef CONFIG_COMPAT |
1586 | static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u) | |
1587 | { | |
1588 | return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u)); | |
1589 | } | |
1590 | #else | |
1591 | #define dm_compat_ctl_ioctl NULL | |
1592 | #endif | |
1593 | ||
fa027c2a | 1594 | static const struct file_operations _ctl_fops = { |
402ab352 | 1595 | .open = nonseekable_open, |
27238b2b | 1596 | .unlocked_ioctl = dm_ctl_ioctl, |
76c072b4 | 1597 | .compat_ioctl = dm_compat_ctl_ioctl, |
1da177e4 | 1598 | .owner = THIS_MODULE, |
6038f373 | 1599 | .llseek = noop_llseek, |
1da177e4 LT |
1600 | }; |
1601 | ||
1602 | static struct miscdevice _dm_misc = { | |
7e507eb6 | 1603 | .minor = MAPPER_CTRL_MINOR, |
1da177e4 | 1604 | .name = DM_NAME, |
7e507eb6 | 1605 | .nodename = DM_DIR "/" DM_CONTROL_NODE, |
1da177e4 LT |
1606 | .fops = &_ctl_fops |
1607 | }; | |
1608 | ||
7e507eb6 PR |
1609 | MODULE_ALIAS_MISCDEV(MAPPER_CTRL_MINOR); |
1610 | MODULE_ALIAS("devname:" DM_DIR "/" DM_CONTROL_NODE); | |
1611 | ||
1da177e4 LT |
1612 | /* |
1613 | * Create misc character device and link to DM_DIR/control. | |
1614 | */ | |
1615 | int __init dm_interface_init(void) | |
1616 | { | |
1617 | int r; | |
1618 | ||
1619 | r = dm_hash_init(); | |
1620 | if (r) | |
1621 | return r; | |
1622 | ||
1623 | r = misc_register(&_dm_misc); | |
1624 | if (r) { | |
1625 | DMERR("misc_register failed for control device"); | |
1626 | dm_hash_exit(); | |
1627 | return r; | |
1628 | } | |
1629 | ||
1630 | DMINFO("%d.%d.%d%s initialised: %s", DM_VERSION_MAJOR, | |
1631 | DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, DM_VERSION_EXTRA, | |
1632 | DM_DRIVER_EMAIL); | |
1633 | return 0; | |
1634 | } | |
1635 | ||
1636 | void dm_interface_exit(void) | |
1637 | { | |
1638 | if (misc_deregister(&_dm_misc) < 0) | |
1639 | DMERR("misc_deregister failed for control device"); | |
1640 | ||
1641 | dm_hash_exit(); | |
1642 | } | |
96a1f7db MA |
1643 | |
1644 | /** | |
1645 | * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers | |
1646 | * @md: Pointer to mapped_device | |
1647 | * @name: Buffer (size DM_NAME_LEN) for name | |
1648 | * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined | |
1649 | */ | |
1650 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) | |
1651 | { | |
1652 | int r = 0; | |
1653 | struct hash_cell *hc; | |
1654 | ||
1655 | if (!md) | |
1656 | return -ENXIO; | |
1657 | ||
6076905b | 1658 | mutex_lock(&dm_hash_cells_mutex); |
96a1f7db MA |
1659 | hc = dm_get_mdptr(md); |
1660 | if (!hc || hc->md != md) { | |
1661 | r = -ENXIO; | |
1662 | goto out; | |
1663 | } | |
1664 | ||
23d39f63 MB |
1665 | if (name) |
1666 | strcpy(name, hc->name); | |
1667 | if (uuid) | |
1668 | strcpy(uuid, hc->uuid ? : ""); | |
96a1f7db MA |
1669 | |
1670 | out: | |
6076905b | 1671 | mutex_unlock(&dm_hash_cells_mutex); |
96a1f7db MA |
1672 | |
1673 | return r; | |
1674 | } |