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> |
1da177e4 LT |
18 | |
19 | #include <asm/uaccess.h> | |
20 | ||
72d94861 | 21 | #define DM_MSG_PREFIX "ioctl" |
1da177e4 LT |
22 | #define DM_DRIVER_EMAIL "dm-devel@redhat.com" |
23 | ||
24 | /*----------------------------------------------------------------- | |
25 | * The ioctl interface needs to be able to look up devices by | |
26 | * name or uuid. | |
27 | *---------------------------------------------------------------*/ | |
28 | struct hash_cell { | |
29 | struct list_head name_list; | |
30 | struct list_head uuid_list; | |
31 | ||
32 | char *name; | |
33 | char *uuid; | |
34 | struct mapped_device *md; | |
35 | struct dm_table *new_map; | |
36 | }; | |
37 | ||
38 | struct vers_iter { | |
39 | size_t param_size; | |
40 | struct dm_target_versions *vers, *old_vers; | |
41 | char *end; | |
42 | uint32_t flags; | |
43 | }; | |
44 | ||
45 | ||
46 | #define NUM_BUCKETS 64 | |
47 | #define MASK_BUCKETS (NUM_BUCKETS - 1) | |
48 | static struct list_head _name_buckets[NUM_BUCKETS]; | |
49 | static struct list_head _uuid_buckets[NUM_BUCKETS]; | |
50 | ||
5c6bd75d | 51 | static void dm_hash_remove_all(int keep_open_devices); |
1da177e4 LT |
52 | |
53 | /* | |
54 | * Guards access to both hash tables. | |
55 | */ | |
56 | static DECLARE_RWSEM(_hash_lock); | |
57 | ||
58 | static void init_buckets(struct list_head *buckets) | |
59 | { | |
60 | unsigned int i; | |
61 | ||
62 | for (i = 0; i < NUM_BUCKETS; i++) | |
63 | INIT_LIST_HEAD(buckets + i); | |
64 | } | |
65 | ||
66 | static int dm_hash_init(void) | |
67 | { | |
68 | init_buckets(_name_buckets); | |
69 | init_buckets(_uuid_buckets); | |
1da177e4 LT |
70 | return 0; |
71 | } | |
72 | ||
73 | static void dm_hash_exit(void) | |
74 | { | |
5c6bd75d | 75 | dm_hash_remove_all(0); |
1da177e4 LT |
76 | } |
77 | ||
78 | /*----------------------------------------------------------------- | |
79 | * Hash function: | |
80 | * We're not really concerned with the str hash function being | |
81 | * fast since it's only used by the ioctl interface. | |
82 | *---------------------------------------------------------------*/ | |
83 | static unsigned int hash_str(const char *str) | |
84 | { | |
85 | const unsigned int hash_mult = 2654435387U; | |
86 | unsigned int h = 0; | |
87 | ||
88 | while (*str) | |
89 | h = (h + (unsigned int) *str++) * hash_mult; | |
90 | ||
91 | return h & MASK_BUCKETS; | |
92 | } | |
93 | ||
94 | /*----------------------------------------------------------------- | |
95 | * Code for looking up a device by name | |
96 | *---------------------------------------------------------------*/ | |
97 | static struct hash_cell *__get_name_cell(const char *str) | |
98 | { | |
99 | struct hash_cell *hc; | |
100 | unsigned int h = hash_str(str); | |
101 | ||
102 | list_for_each_entry (hc, _name_buckets + h, name_list) | |
7ec75f25 JM |
103 | if (!strcmp(hc->name, str)) { |
104 | dm_get(hc->md); | |
1da177e4 | 105 | return hc; |
7ec75f25 | 106 | } |
1da177e4 LT |
107 | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | static struct hash_cell *__get_uuid_cell(const char *str) | |
112 | { | |
113 | struct hash_cell *hc; | |
114 | unsigned int h = hash_str(str); | |
115 | ||
116 | list_for_each_entry (hc, _uuid_buckets + h, uuid_list) | |
7ec75f25 JM |
117 | if (!strcmp(hc->uuid, str)) { |
118 | dm_get(hc->md); | |
1da177e4 | 119 | return hc; |
7ec75f25 | 120 | } |
1da177e4 LT |
121 | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | /*----------------------------------------------------------------- | |
126 | * Inserting, removing and renaming a device. | |
127 | *---------------------------------------------------------------*/ | |
1da177e4 LT |
128 | static struct hash_cell *alloc_cell(const char *name, const char *uuid, |
129 | struct mapped_device *md) | |
130 | { | |
131 | struct hash_cell *hc; | |
132 | ||
133 | hc = kmalloc(sizeof(*hc), GFP_KERNEL); | |
134 | if (!hc) | |
135 | return NULL; | |
136 | ||
543537bd | 137 | hc->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
138 | if (!hc->name) { |
139 | kfree(hc); | |
140 | return NULL; | |
141 | } | |
142 | ||
143 | if (!uuid) | |
144 | hc->uuid = NULL; | |
145 | ||
146 | else { | |
543537bd | 147 | hc->uuid = kstrdup(uuid, GFP_KERNEL); |
1da177e4 LT |
148 | if (!hc->uuid) { |
149 | kfree(hc->name); | |
150 | kfree(hc); | |
151 | return NULL; | |
152 | } | |
153 | } | |
154 | ||
155 | INIT_LIST_HEAD(&hc->name_list); | |
156 | INIT_LIST_HEAD(&hc->uuid_list); | |
157 | hc->md = md; | |
158 | hc->new_map = NULL; | |
159 | return hc; | |
160 | } | |
161 | ||
162 | static void free_cell(struct hash_cell *hc) | |
163 | { | |
164 | if (hc) { | |
165 | kfree(hc->name); | |
166 | kfree(hc->uuid); | |
167 | kfree(hc); | |
168 | } | |
169 | } | |
170 | ||
1da177e4 LT |
171 | /* |
172 | * The kdev_t and uuid of a device can never change once it is | |
173 | * initially inserted. | |
174 | */ | |
175 | static int dm_hash_insert(const char *name, const char *uuid, struct mapped_device *md) | |
176 | { | |
7ec75f25 | 177 | struct hash_cell *cell, *hc; |
1da177e4 LT |
178 | |
179 | /* | |
180 | * Allocate the new cells. | |
181 | */ | |
182 | cell = alloc_cell(name, uuid, md); | |
183 | if (!cell) | |
184 | return -ENOMEM; | |
185 | ||
186 | /* | |
187 | * Insert the cell into both hash tables. | |
188 | */ | |
189 | down_write(&_hash_lock); | |
7ec75f25 JM |
190 | hc = __get_name_cell(name); |
191 | if (hc) { | |
192 | dm_put(hc->md); | |
1da177e4 | 193 | goto bad; |
7ec75f25 | 194 | } |
1da177e4 LT |
195 | |
196 | list_add(&cell->name_list, _name_buckets + hash_str(name)); | |
197 | ||
198 | if (uuid) { | |
7ec75f25 JM |
199 | hc = __get_uuid_cell(uuid); |
200 | if (hc) { | |
1da177e4 | 201 | list_del(&cell->name_list); |
7ec75f25 | 202 | dm_put(hc->md); |
1da177e4 LT |
203 | goto bad; |
204 | } | |
205 | list_add(&cell->uuid_list, _uuid_buckets + hash_str(uuid)); | |
206 | } | |
1da177e4 LT |
207 | dm_get(md); |
208 | dm_set_mdptr(md, cell); | |
209 | up_write(&_hash_lock); | |
210 | ||
211 | return 0; | |
212 | ||
213 | bad: | |
214 | up_write(&_hash_lock); | |
215 | free_cell(cell); | |
216 | return -EBUSY; | |
217 | } | |
218 | ||
219 | static void __hash_remove(struct hash_cell *hc) | |
220 | { | |
269fd2a6 | 221 | struct dm_table *table; |
222 | ||
1da177e4 LT |
223 | /* remove from the dev hash */ |
224 | list_del(&hc->uuid_list); | |
225 | list_del(&hc->name_list); | |
1da177e4 | 226 | dm_set_mdptr(hc->md, NULL); |
269fd2a6 | 227 | |
228 | table = dm_get_table(hc->md); | |
229 | if (table) { | |
230 | dm_table_event(table); | |
231 | dm_table_put(table); | |
232 | } | |
233 | ||
1da177e4 LT |
234 | if (hc->new_map) |
235 | dm_table_put(hc->new_map); | |
1134e5ae | 236 | dm_put(hc->md); |
1da177e4 LT |
237 | free_cell(hc); |
238 | } | |
239 | ||
5c6bd75d | 240 | static void dm_hash_remove_all(int keep_open_devices) |
1da177e4 | 241 | { |
5c6bd75d | 242 | int i, dev_skipped, dev_removed; |
1da177e4 LT |
243 | struct hash_cell *hc; |
244 | struct list_head *tmp, *n; | |
245 | ||
246 | down_write(&_hash_lock); | |
5c6bd75d AK |
247 | |
248 | retry: | |
249 | dev_skipped = dev_removed = 0; | |
1da177e4 LT |
250 | for (i = 0; i < NUM_BUCKETS; i++) { |
251 | list_for_each_safe (tmp, n, _name_buckets + i) { | |
252 | hc = list_entry(tmp, struct hash_cell, name_list); | |
5c6bd75d AK |
253 | |
254 | if (keep_open_devices && | |
255 | dm_lock_for_deletion(hc->md)) { | |
256 | dev_skipped++; | |
257 | continue; | |
258 | } | |
1da177e4 | 259 | __hash_remove(hc); |
5c6bd75d | 260 | dev_removed = 1; |
1da177e4 LT |
261 | } |
262 | } | |
5c6bd75d AK |
263 | |
264 | /* | |
265 | * Some mapped devices may be using other mapped devices, so if any | |
266 | * still exist, repeat until we make no further progress. | |
267 | */ | |
268 | if (dev_skipped) { | |
269 | if (dev_removed) | |
270 | goto retry; | |
271 | ||
272 | DMWARN("remove_all left %d open device(s)", dev_skipped); | |
273 | } | |
274 | ||
1da177e4 LT |
275 | up_write(&_hash_lock); |
276 | } | |
277 | ||
278 | static int dm_hash_rename(const char *old, const char *new) | |
279 | { | |
280 | char *new_name, *old_name; | |
281 | struct hash_cell *hc; | |
81f1777a | 282 | struct dm_table *table; |
1da177e4 LT |
283 | |
284 | /* | |
285 | * duplicate new. | |
286 | */ | |
543537bd | 287 | new_name = kstrdup(new, GFP_KERNEL); |
1da177e4 LT |
288 | if (!new_name) |
289 | return -ENOMEM; | |
290 | ||
291 | down_write(&_hash_lock); | |
292 | ||
293 | /* | |
294 | * Is new free ? | |
295 | */ | |
296 | hc = __get_name_cell(new); | |
297 | if (hc) { | |
298 | DMWARN("asked to rename to an already existing name %s -> %s", | |
299 | old, new); | |
7ec75f25 | 300 | dm_put(hc->md); |
1da177e4 LT |
301 | up_write(&_hash_lock); |
302 | kfree(new_name); | |
303 | return -EBUSY; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Is there such a device as 'old' ? | |
308 | */ | |
309 | hc = __get_name_cell(old); | |
310 | if (!hc) { | |
311 | DMWARN("asked to rename a non existent device %s -> %s", | |
312 | old, new); | |
313 | up_write(&_hash_lock); | |
314 | kfree(new_name); | |
315 | return -ENXIO; | |
316 | } | |
317 | ||
318 | /* | |
319 | * rename and move the name cell. | |
320 | */ | |
1da177e4 LT |
321 | list_del(&hc->name_list); |
322 | old_name = hc->name; | |
323 | hc->name = new_name; | |
324 | list_add(&hc->name_list, _name_buckets + hash_str(new_name)); | |
325 | ||
81f1777a | 326 | /* |
327 | * Wake up any dm event waiters. | |
328 | */ | |
329 | table = dm_get_table(hc->md); | |
330 | if (table) { | |
331 | dm_table_event(table); | |
332 | dm_table_put(table); | |
333 | } | |
334 | ||
69267a30 AK |
335 | dm_kobject_uevent(hc->md); |
336 | ||
7ec75f25 | 337 | dm_put(hc->md); |
1da177e4 LT |
338 | up_write(&_hash_lock); |
339 | kfree(old_name); | |
340 | return 0; | |
341 | } | |
342 | ||
343 | /*----------------------------------------------------------------- | |
344 | * Implementation of the ioctl commands | |
345 | *---------------------------------------------------------------*/ | |
346 | /* | |
347 | * All the ioctl commands get dispatched to functions with this | |
348 | * prototype. | |
349 | */ | |
350 | typedef int (*ioctl_fn)(struct dm_ioctl *param, size_t param_size); | |
351 | ||
352 | static int remove_all(struct dm_ioctl *param, size_t param_size) | |
353 | { | |
5c6bd75d | 354 | dm_hash_remove_all(1); |
1da177e4 LT |
355 | param->data_size = 0; |
356 | return 0; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Round up the ptr to an 8-byte boundary. | |
361 | */ | |
362 | #define ALIGN_MASK 7 | |
363 | static inline void *align_ptr(void *ptr) | |
364 | { | |
365 | return (void *) (((size_t) (ptr + ALIGN_MASK)) & ~ALIGN_MASK); | |
366 | } | |
367 | ||
368 | /* | |
369 | * Retrieves the data payload buffer from an already allocated | |
370 | * struct dm_ioctl. | |
371 | */ | |
372 | static void *get_result_buffer(struct dm_ioctl *param, size_t param_size, | |
373 | size_t *len) | |
374 | { | |
375 | param->data_start = align_ptr(param + 1) - (void *) param; | |
376 | ||
377 | if (param->data_start < param_size) | |
378 | *len = param_size - param->data_start; | |
379 | else | |
380 | *len = 0; | |
381 | ||
382 | return ((void *) param) + param->data_start; | |
383 | } | |
384 | ||
385 | static int list_devices(struct dm_ioctl *param, size_t param_size) | |
386 | { | |
387 | unsigned int i; | |
388 | struct hash_cell *hc; | |
389 | size_t len, needed = 0; | |
390 | struct gendisk *disk; | |
391 | struct dm_name_list *nl, *old_nl = NULL; | |
392 | ||
393 | down_write(&_hash_lock); | |
394 | ||
395 | /* | |
396 | * Loop through all the devices working out how much | |
397 | * space we need. | |
398 | */ | |
399 | for (i = 0; i < NUM_BUCKETS; i++) { | |
400 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
401 | needed += sizeof(struct dm_name_list); | |
402 | needed += strlen(hc->name) + 1; | |
403 | needed += ALIGN_MASK; | |
404 | } | |
405 | } | |
406 | ||
407 | /* | |
408 | * Grab our output buffer. | |
409 | */ | |
410 | nl = get_result_buffer(param, param_size, &len); | |
411 | if (len < needed) { | |
412 | param->flags |= DM_BUFFER_FULL_FLAG; | |
413 | goto out; | |
414 | } | |
415 | param->data_size = param->data_start + needed; | |
416 | ||
417 | nl->dev = 0; /* Flags no data */ | |
418 | ||
419 | /* | |
420 | * Now loop through filling out the names. | |
421 | */ | |
422 | for (i = 0; i < NUM_BUCKETS; i++) { | |
423 | list_for_each_entry (hc, _name_buckets + i, name_list) { | |
424 | if (old_nl) | |
425 | old_nl->next = (uint32_t) ((void *) nl - | |
426 | (void *) old_nl); | |
427 | disk = dm_disk(hc->md); | |
428 | nl->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor)); | |
429 | nl->next = 0; | |
430 | strcpy(nl->name, hc->name); | |
431 | ||
432 | old_nl = nl; | |
433 | nl = align_ptr(((void *) ++nl) + strlen(hc->name) + 1); | |
434 | } | |
435 | } | |
436 | ||
437 | out: | |
438 | up_write(&_hash_lock); | |
439 | return 0; | |
440 | } | |
441 | ||
442 | static void list_version_get_needed(struct target_type *tt, void *needed_param) | |
443 | { | |
444 | size_t *needed = needed_param; | |
445 | ||
c4cc6635 | 446 | *needed += sizeof(struct dm_target_versions); |
1da177e4 | 447 | *needed += strlen(tt->name); |
1da177e4 LT |
448 | *needed += ALIGN_MASK; |
449 | } | |
450 | ||
451 | static void list_version_get_info(struct target_type *tt, void *param) | |
452 | { | |
453 | struct vers_iter *info = param; | |
454 | ||
455 | /* Check space - it might have changed since the first iteration */ | |
456 | if ((char *)info->vers + sizeof(tt->version) + strlen(tt->name) + 1 > | |
457 | info->end) { | |
458 | ||
459 | info->flags = DM_BUFFER_FULL_FLAG; | |
460 | return; | |
461 | } | |
462 | ||
463 | if (info->old_vers) | |
464 | info->old_vers->next = (uint32_t) ((void *)info->vers - | |
465 | (void *)info->old_vers); | |
466 | info->vers->version[0] = tt->version[0]; | |
467 | info->vers->version[1] = tt->version[1]; | |
468 | info->vers->version[2] = tt->version[2]; | |
469 | info->vers->next = 0; | |
470 | strcpy(info->vers->name, tt->name); | |
471 | ||
472 | info->old_vers = info->vers; | |
473 | info->vers = align_ptr(((void *) ++info->vers) + strlen(tt->name) + 1); | |
474 | } | |
475 | ||
476 | static int list_versions(struct dm_ioctl *param, size_t param_size) | |
477 | { | |
478 | size_t len, needed = 0; | |
479 | struct dm_target_versions *vers; | |
480 | struct vers_iter iter_info; | |
481 | ||
482 | /* | |
483 | * Loop through all the devices working out how much | |
484 | * space we need. | |
485 | */ | |
486 | dm_target_iterate(list_version_get_needed, &needed); | |
487 | ||
488 | /* | |
489 | * Grab our output buffer. | |
490 | */ | |
491 | vers = get_result_buffer(param, param_size, &len); | |
492 | if (len < needed) { | |
493 | param->flags |= DM_BUFFER_FULL_FLAG; | |
494 | goto out; | |
495 | } | |
496 | param->data_size = param->data_start + needed; | |
497 | ||
498 | iter_info.param_size = param_size; | |
499 | iter_info.old_vers = NULL; | |
500 | iter_info.vers = vers; | |
501 | iter_info.flags = 0; | |
502 | iter_info.end = (char *)vers+len; | |
503 | ||
504 | /* | |
505 | * Now loop through filling out the names & versions. | |
506 | */ | |
507 | dm_target_iterate(list_version_get_info, &iter_info); | |
508 | param->flags |= iter_info.flags; | |
509 | ||
510 | out: | |
511 | return 0; | |
512 | } | |
513 | ||
514 | ||
515 | ||
516 | static int check_name(const char *name) | |
517 | { | |
518 | if (strchr(name, '/')) { | |
519 | DMWARN("invalid device name"); | |
520 | return -EINVAL; | |
521 | } | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Fills in a dm_ioctl structure, ready for sending back to | |
528 | * userland. | |
529 | */ | |
530 | static int __dev_status(struct mapped_device *md, struct dm_ioctl *param) | |
531 | { | |
532 | struct gendisk *disk = dm_disk(md); | |
533 | struct dm_table *table; | |
1da177e4 LT |
534 | |
535 | param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG | | |
536 | DM_ACTIVE_PRESENT_FLAG); | |
537 | ||
538 | if (dm_suspended(md)) | |
539 | param->flags |= DM_SUSPEND_FLAG; | |
540 | ||
541 | param->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor)); | |
542 | ||
5c6bd75d AK |
543 | /* |
544 | * Yes, this will be out of date by the time it gets back | |
545 | * to userland, but it is still very useful for | |
546 | * debugging. | |
547 | */ | |
548 | param->open_count = dm_open_count(md); | |
1da177e4 LT |
549 | |
550 | if (disk->policy) | |
551 | param->flags |= DM_READONLY_FLAG; | |
552 | ||
553 | param->event_nr = dm_get_event_nr(md); | |
554 | ||
555 | table = dm_get_table(md); | |
556 | if (table) { | |
557 | param->flags |= DM_ACTIVE_PRESENT_FLAG; | |
558 | param->target_count = dm_table_get_num_targets(table); | |
559 | dm_table_put(table); | |
560 | } else | |
561 | param->target_count = 0; | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | static int dev_create(struct dm_ioctl *param, size_t param_size) | |
567 | { | |
2b06cfff | 568 | int r, m = DM_ANY_MINOR; |
1da177e4 LT |
569 | struct mapped_device *md; |
570 | ||
571 | r = check_name(param->name); | |
572 | if (r) | |
573 | return r; | |
574 | ||
575 | if (param->flags & DM_PERSISTENT_DEV_FLAG) | |
2b06cfff | 576 | m = MINOR(huge_decode_dev(param->dev)); |
1da177e4 | 577 | |
2b06cfff | 578 | r = dm_create(m, &md); |
1da177e4 LT |
579 | if (r) |
580 | return r; | |
581 | ||
582 | r = dm_hash_insert(param->name, *param->uuid ? param->uuid : NULL, md); | |
583 | if (r) { | |
584 | dm_put(md); | |
585 | return r; | |
586 | } | |
587 | ||
588 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
589 | ||
590 | r = __dev_status(md, param); | |
591 | dm_put(md); | |
592 | ||
593 | return r; | |
594 | } | |
595 | ||
596 | /* | |
597 | * Always use UUID for lookups if it's present, otherwise use name or dev. | |
598 | */ | |
858119e1 | 599 | static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) |
1da177e4 | 600 | { |
9ade92a9 AK |
601 | struct mapped_device *md; |
602 | void *mdptr = NULL; | |
603 | ||
1da177e4 LT |
604 | if (*param->uuid) |
605 | return __get_uuid_cell(param->uuid); | |
9ade92a9 AK |
606 | |
607 | if (*param->name) | |
1da177e4 | 608 | return __get_name_cell(param->name); |
9ade92a9 AK |
609 | |
610 | md = dm_get_md(huge_decode_dev(param->dev)); | |
bfc5ecdf AK |
611 | if (!md) |
612 | goto out; | |
613 | ||
614 | mdptr = dm_get_mdptr(md); | |
615 | if (!mdptr) | |
616 | dm_put(md); | |
9ade92a9 | 617 | |
bfc5ecdf | 618 | out: |
9ade92a9 | 619 | return mdptr; |
1da177e4 LT |
620 | } |
621 | ||
858119e1 | 622 | static struct mapped_device *find_device(struct dm_ioctl *param) |
1da177e4 LT |
623 | { |
624 | struct hash_cell *hc; | |
625 | struct mapped_device *md = NULL; | |
626 | ||
627 | down_read(&_hash_lock); | |
628 | hc = __find_device_hash_cell(param); | |
629 | if (hc) { | |
630 | md = hc->md; | |
1da177e4 LT |
631 | |
632 | /* | |
633 | * Sneakily write in both the name and the uuid | |
634 | * while we have the cell. | |
635 | */ | |
636 | strncpy(param->name, hc->name, sizeof(param->name)); | |
637 | if (hc->uuid) | |
638 | strncpy(param->uuid, hc->uuid, sizeof(param->uuid)-1); | |
639 | else | |
640 | param->uuid[0] = '\0'; | |
641 | ||
642 | if (hc->new_map) | |
643 | param->flags |= DM_INACTIVE_PRESENT_FLAG; | |
644 | else | |
645 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
646 | } | |
647 | up_read(&_hash_lock); | |
648 | ||
649 | return md; | |
650 | } | |
651 | ||
652 | static int dev_remove(struct dm_ioctl *param, size_t param_size) | |
653 | { | |
654 | struct hash_cell *hc; | |
7ec75f25 | 655 | struct mapped_device *md; |
5c6bd75d | 656 | int r; |
1da177e4 LT |
657 | |
658 | down_write(&_hash_lock); | |
659 | hc = __find_device_hash_cell(param); | |
660 | ||
661 | if (!hc) { | |
662 | DMWARN("device doesn't appear to be in the dev hash table."); | |
663 | up_write(&_hash_lock); | |
664 | return -ENXIO; | |
665 | } | |
666 | ||
7ec75f25 JM |
667 | md = hc->md; |
668 | ||
5c6bd75d AK |
669 | /* |
670 | * Ensure the device is not open and nothing further can open it. | |
671 | */ | |
672 | r = dm_lock_for_deletion(md); | |
673 | if (r) { | |
674 | DMWARN("unable to remove open device %s", hc->name); | |
675 | up_write(&_hash_lock); | |
676 | dm_put(md); | |
677 | return r; | |
678 | } | |
679 | ||
1da177e4 LT |
680 | __hash_remove(hc); |
681 | up_write(&_hash_lock); | |
7ec75f25 | 682 | dm_put(md); |
1da177e4 LT |
683 | param->data_size = 0; |
684 | return 0; | |
685 | } | |
686 | ||
687 | /* | |
688 | * Check a string doesn't overrun the chunk of | |
689 | * memory we copied from userland. | |
690 | */ | |
691 | static int invalid_str(char *str, void *end) | |
692 | { | |
693 | while ((void *) str < end) | |
694 | if (!*str++) | |
695 | return 0; | |
696 | ||
697 | return -EINVAL; | |
698 | } | |
699 | ||
700 | static int dev_rename(struct dm_ioctl *param, size_t param_size) | |
701 | { | |
702 | int r; | |
703 | char *new_name = (char *) param + param->data_start; | |
704 | ||
027d50f9 | 705 | if (new_name < (char *) param->data || |
1da177e4 LT |
706 | invalid_str(new_name, (void *) param + param_size)) { |
707 | DMWARN("Invalid new logical volume name supplied."); | |
708 | return -EINVAL; | |
709 | } | |
710 | ||
711 | r = check_name(new_name); | |
712 | if (r) | |
713 | return r; | |
714 | ||
715 | param->data_size = 0; | |
716 | return dm_hash_rename(param->name, new_name); | |
717 | } | |
718 | ||
3ac51e74 DW |
719 | static int dev_set_geometry(struct dm_ioctl *param, size_t param_size) |
720 | { | |
721 | int r = -EINVAL, x; | |
722 | struct mapped_device *md; | |
723 | struct hd_geometry geometry; | |
724 | unsigned long indata[4]; | |
725 | char *geostr = (char *) param + param->data_start; | |
726 | ||
727 | md = find_device(param); | |
728 | if (!md) | |
729 | return -ENXIO; | |
730 | ||
027d50f9 | 731 | if (geostr < (char *) param->data || |
3ac51e74 DW |
732 | invalid_str(geostr, (void *) param + param_size)) { |
733 | DMWARN("Invalid geometry supplied."); | |
734 | goto out; | |
735 | } | |
736 | ||
737 | x = sscanf(geostr, "%lu %lu %lu %lu", indata, | |
738 | indata + 1, indata + 2, indata + 3); | |
739 | ||
740 | if (x != 4) { | |
741 | DMWARN("Unable to interpret geometry settings."); | |
742 | goto out; | |
743 | } | |
744 | ||
745 | if (indata[0] > 65535 || indata[1] > 255 || | |
746 | indata[2] > 255 || indata[3] > ULONG_MAX) { | |
747 | DMWARN("Geometry exceeds range limits."); | |
748 | goto out; | |
749 | } | |
750 | ||
751 | geometry.cylinders = indata[0]; | |
752 | geometry.heads = indata[1]; | |
753 | geometry.sectors = indata[2]; | |
754 | geometry.start = indata[3]; | |
755 | ||
756 | r = dm_set_geometry(md, &geometry); | |
757 | if (!r) | |
758 | r = __dev_status(md, param); | |
759 | ||
760 | param->data_size = 0; | |
761 | ||
762 | out: | |
763 | dm_put(md); | |
764 | return r; | |
765 | } | |
766 | ||
1da177e4 LT |
767 | static int do_suspend(struct dm_ioctl *param) |
768 | { | |
769 | int r = 0; | |
a3d77d35 | 770 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
771 | struct mapped_device *md; |
772 | ||
773 | md = find_device(param); | |
774 | if (!md) | |
775 | return -ENXIO; | |
776 | ||
6da487dc | 777 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 778 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
779 | if (param->flags & DM_NOFLUSH_FLAG) |
780 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
6da487dc | 781 | |
1da177e4 | 782 | if (!dm_suspended(md)) |
a3d77d35 | 783 | r = dm_suspend(md, suspend_flags); |
1da177e4 LT |
784 | |
785 | if (!r) | |
786 | r = __dev_status(md, param); | |
787 | ||
788 | dm_put(md); | |
789 | return r; | |
790 | } | |
791 | ||
792 | static int do_resume(struct dm_ioctl *param) | |
793 | { | |
794 | int r = 0; | |
a3d77d35 | 795 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
796 | struct hash_cell *hc; |
797 | struct mapped_device *md; | |
798 | struct dm_table *new_map; | |
799 | ||
800 | down_write(&_hash_lock); | |
801 | ||
802 | hc = __find_device_hash_cell(param); | |
803 | if (!hc) { | |
804 | DMWARN("device doesn't appear to be in the dev hash table."); | |
805 | up_write(&_hash_lock); | |
806 | return -ENXIO; | |
807 | } | |
808 | ||
809 | md = hc->md; | |
1da177e4 LT |
810 | |
811 | new_map = hc->new_map; | |
812 | hc->new_map = NULL; | |
813 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
814 | ||
815 | up_write(&_hash_lock); | |
816 | ||
817 | /* Do we need to load a new map ? */ | |
818 | if (new_map) { | |
819 | /* Suspend if it isn't already suspended */ | |
6da487dc | 820 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 821 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
822 | if (param->flags & DM_NOFLUSH_FLAG) |
823 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
1da177e4 | 824 | if (!dm_suspended(md)) |
a3d77d35 | 825 | dm_suspend(md, suspend_flags); |
1da177e4 LT |
826 | |
827 | r = dm_swap_table(md, new_map); | |
828 | if (r) { | |
829 | dm_put(md); | |
830 | dm_table_put(new_map); | |
831 | return r; | |
832 | } | |
833 | ||
834 | if (dm_table_get_mode(new_map) & FMODE_WRITE) | |
835 | set_disk_ro(dm_disk(md), 0); | |
836 | else | |
837 | set_disk_ro(dm_disk(md), 1); | |
838 | ||
839 | dm_table_put(new_map); | |
840 | } | |
841 | ||
842 | if (dm_suspended(md)) | |
843 | r = dm_resume(md); | |
844 | ||
845 | if (!r) | |
846 | r = __dev_status(md, param); | |
847 | ||
848 | dm_put(md); | |
849 | return r; | |
850 | } | |
851 | ||
852 | /* | |
853 | * Set or unset the suspension state of a device. | |
854 | * If the device already is in the requested state we just return its status. | |
855 | */ | |
856 | static int dev_suspend(struct dm_ioctl *param, size_t param_size) | |
857 | { | |
858 | if (param->flags & DM_SUSPEND_FLAG) | |
859 | return do_suspend(param); | |
860 | ||
861 | return do_resume(param); | |
862 | } | |
863 | ||
864 | /* | |
865 | * Copies device info back to user space, used by | |
866 | * the create and info ioctls. | |
867 | */ | |
868 | static int dev_status(struct dm_ioctl *param, size_t param_size) | |
869 | { | |
870 | int r; | |
871 | struct mapped_device *md; | |
872 | ||
873 | md = find_device(param); | |
874 | if (!md) | |
875 | return -ENXIO; | |
876 | ||
877 | r = __dev_status(md, param); | |
878 | dm_put(md); | |
879 | return r; | |
880 | } | |
881 | ||
882 | /* | |
883 | * Build up the status struct for each target | |
884 | */ | |
885 | static void retrieve_status(struct dm_table *table, | |
886 | struct dm_ioctl *param, size_t param_size) | |
887 | { | |
888 | unsigned int i, num_targets; | |
889 | struct dm_target_spec *spec; | |
890 | char *outbuf, *outptr; | |
891 | status_type_t type; | |
892 | size_t remaining, len, used = 0; | |
893 | ||
894 | outptr = outbuf = get_result_buffer(param, param_size, &len); | |
895 | ||
896 | if (param->flags & DM_STATUS_TABLE_FLAG) | |
897 | type = STATUSTYPE_TABLE; | |
898 | else | |
899 | type = STATUSTYPE_INFO; | |
900 | ||
901 | /* Get all the target info */ | |
902 | num_targets = dm_table_get_num_targets(table); | |
903 | for (i = 0; i < num_targets; i++) { | |
904 | struct dm_target *ti = dm_table_get_target(table, i); | |
905 | ||
906 | remaining = len - (outptr - outbuf); | |
907 | if (remaining <= sizeof(struct dm_target_spec)) { | |
908 | param->flags |= DM_BUFFER_FULL_FLAG; | |
909 | break; | |
910 | } | |
911 | ||
912 | spec = (struct dm_target_spec *) outptr; | |
913 | ||
914 | spec->status = 0; | |
915 | spec->sector_start = ti->begin; | |
916 | spec->length = ti->len; | |
917 | strncpy(spec->target_type, ti->type->name, | |
918 | sizeof(spec->target_type)); | |
919 | ||
920 | outptr += sizeof(struct dm_target_spec); | |
921 | remaining = len - (outptr - outbuf); | |
922 | if (remaining <= 0) { | |
923 | param->flags |= DM_BUFFER_FULL_FLAG; | |
924 | break; | |
925 | } | |
926 | ||
927 | /* Get the status/table string from the target driver */ | |
928 | if (ti->type->status) { | |
929 | if (ti->type->status(ti, type, outptr, remaining)) { | |
930 | param->flags |= DM_BUFFER_FULL_FLAG; | |
931 | break; | |
932 | } | |
933 | } else | |
934 | outptr[0] = '\0'; | |
935 | ||
936 | outptr += strlen(outptr) + 1; | |
937 | used = param->data_start + (outptr - outbuf); | |
938 | ||
939 | outptr = align_ptr(outptr); | |
940 | spec->next = outptr - outbuf; | |
941 | } | |
942 | ||
943 | if (used) | |
944 | param->data_size = used; | |
945 | ||
946 | param->target_count = num_targets; | |
947 | } | |
948 | ||
949 | /* | |
950 | * Wait for a device to report an event | |
951 | */ | |
952 | static int dev_wait(struct dm_ioctl *param, size_t param_size) | |
953 | { | |
954 | int r; | |
955 | struct mapped_device *md; | |
956 | struct dm_table *table; | |
957 | ||
958 | md = find_device(param); | |
959 | if (!md) | |
960 | return -ENXIO; | |
961 | ||
962 | /* | |
963 | * Wait for a notification event | |
964 | */ | |
965 | if (dm_wait_event(md, param->event_nr)) { | |
966 | r = -ERESTARTSYS; | |
967 | goto out; | |
968 | } | |
969 | ||
970 | /* | |
971 | * The userland program is going to want to know what | |
972 | * changed to trigger the event, so we may as well tell | |
973 | * him and save an ioctl. | |
974 | */ | |
975 | r = __dev_status(md, param); | |
976 | if (r) | |
977 | goto out; | |
978 | ||
979 | table = dm_get_table(md); | |
980 | if (table) { | |
981 | retrieve_status(table, param, param_size); | |
982 | dm_table_put(table); | |
983 | } | |
984 | ||
985 | out: | |
986 | dm_put(md); | |
987 | return r; | |
988 | } | |
989 | ||
990 | static inline int get_mode(struct dm_ioctl *param) | |
991 | { | |
992 | int mode = FMODE_READ | FMODE_WRITE; | |
993 | ||
994 | if (param->flags & DM_READONLY_FLAG) | |
995 | mode = FMODE_READ; | |
996 | ||
997 | return mode; | |
998 | } | |
999 | ||
1000 | static int next_target(struct dm_target_spec *last, uint32_t next, void *end, | |
1001 | struct dm_target_spec **spec, char **target_params) | |
1002 | { | |
1003 | *spec = (struct dm_target_spec *) ((unsigned char *) last + next); | |
1004 | *target_params = (char *) (*spec + 1); | |
1005 | ||
1006 | if (*spec < (last + 1)) | |
1007 | return -EINVAL; | |
1008 | ||
1009 | return invalid_str(*target_params, end); | |
1010 | } | |
1011 | ||
1012 | static int populate_table(struct dm_table *table, | |
1013 | struct dm_ioctl *param, size_t param_size) | |
1014 | { | |
1015 | int r; | |
1016 | unsigned int i = 0; | |
1017 | struct dm_target_spec *spec = (struct dm_target_spec *) param; | |
1018 | uint32_t next = param->data_start; | |
1019 | void *end = (void *) param + param_size; | |
1020 | char *target_params; | |
1021 | ||
1022 | if (!param->target_count) { | |
1023 | DMWARN("populate_table: no targets specified"); | |
1024 | return -EINVAL; | |
1025 | } | |
1026 | ||
1027 | for (i = 0; i < param->target_count; i++) { | |
1028 | ||
1029 | r = next_target(spec, next, end, &spec, &target_params); | |
1030 | if (r) { | |
1031 | DMWARN("unable to find target"); | |
1032 | return r; | |
1033 | } | |
1034 | ||
1035 | r = dm_table_add_target(table, spec->target_type, | |
1036 | (sector_t) spec->sector_start, | |
1037 | (sector_t) spec->length, | |
1038 | target_params); | |
1039 | if (r) { | |
1040 | DMWARN("error adding target to table"); | |
1041 | return r; | |
1042 | } | |
1043 | ||
1044 | next = spec->next; | |
1045 | } | |
1046 | ||
1047 | return dm_table_complete(table); | |
1048 | } | |
1049 | ||
1050 | static int table_load(struct dm_ioctl *param, size_t param_size) | |
1051 | { | |
1052 | int r; | |
1053 | struct hash_cell *hc; | |
1054 | struct dm_table *t; | |
1134e5ae MA |
1055 | struct mapped_device *md; |
1056 | ||
1057 | md = find_device(param); | |
1058 | if (!md) | |
1059 | return -ENXIO; | |
1da177e4 | 1060 | |
1134e5ae | 1061 | r = dm_table_create(&t, get_mode(param), param->target_count, md); |
1da177e4 | 1062 | if (r) |
1134e5ae | 1063 | goto out; |
1da177e4 LT |
1064 | |
1065 | r = populate_table(t, param, param_size); | |
1066 | if (r) { | |
1067 | dm_table_put(t); | |
1134e5ae | 1068 | goto out; |
1da177e4 LT |
1069 | } |
1070 | ||
1071 | down_write(&_hash_lock); | |
1134e5ae MA |
1072 | hc = dm_get_mdptr(md); |
1073 | if (!hc || hc->md != md) { | |
1074 | DMWARN("device has been removed from the dev hash table."); | |
b6fcc80d | 1075 | dm_table_put(t); |
1134e5ae MA |
1076 | up_write(&_hash_lock); |
1077 | r = -ENXIO; | |
1078 | goto out; | |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | if (hc->new_map) | |
1082 | dm_table_put(hc->new_map); | |
1083 | hc->new_map = t; | |
1134e5ae MA |
1084 | up_write(&_hash_lock); |
1085 | ||
1da177e4 | 1086 | param->flags |= DM_INACTIVE_PRESENT_FLAG; |
1134e5ae MA |
1087 | r = __dev_status(md, param); |
1088 | ||
1089 | out: | |
1090 | dm_put(md); | |
1da177e4 | 1091 | |
1da177e4 LT |
1092 | return r; |
1093 | } | |
1094 | ||
1095 | static int table_clear(struct dm_ioctl *param, size_t param_size) | |
1096 | { | |
1097 | int r; | |
1098 | struct hash_cell *hc; | |
7ec75f25 | 1099 | struct mapped_device *md; |
1da177e4 LT |
1100 | |
1101 | down_write(&_hash_lock); | |
1102 | ||
1103 | hc = __find_device_hash_cell(param); | |
1104 | if (!hc) { | |
1105 | DMWARN("device doesn't appear to be in the dev hash table."); | |
1106 | up_write(&_hash_lock); | |
1107 | return -ENXIO; | |
1108 | } | |
1109 | ||
1110 | if (hc->new_map) { | |
1111 | dm_table_put(hc->new_map); | |
1112 | hc->new_map = NULL; | |
1113 | } | |
1114 | ||
1115 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
1116 | ||
1117 | r = __dev_status(hc->md, param); | |
7ec75f25 | 1118 | md = hc->md; |
1da177e4 | 1119 | up_write(&_hash_lock); |
7ec75f25 | 1120 | dm_put(md); |
1da177e4 LT |
1121 | return r; |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Retrieves a list of devices used by a particular dm device. | |
1126 | */ | |
1127 | static void retrieve_deps(struct dm_table *table, | |
1128 | struct dm_ioctl *param, size_t param_size) | |
1129 | { | |
1130 | unsigned int count = 0; | |
1131 | struct list_head *tmp; | |
1132 | size_t len, needed; | |
1133 | struct dm_dev *dd; | |
1134 | struct dm_target_deps *deps; | |
1135 | ||
1136 | deps = get_result_buffer(param, param_size, &len); | |
1137 | ||
1138 | /* | |
1139 | * Count the devices. | |
1140 | */ | |
1141 | list_for_each (tmp, dm_table_get_devices(table)) | |
1142 | count++; | |
1143 | ||
1144 | /* | |
1145 | * Check we have enough space. | |
1146 | */ | |
1147 | needed = sizeof(*deps) + (sizeof(*deps->dev) * count); | |
1148 | if (len < needed) { | |
1149 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1150 | return; | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * Fill in the devices. | |
1155 | */ | |
1156 | deps->count = count; | |
1157 | count = 0; | |
1158 | list_for_each_entry (dd, dm_table_get_devices(table), list) | |
1159 | deps->dev[count++] = huge_encode_dev(dd->bdev->bd_dev); | |
1160 | ||
1161 | param->data_size = param->data_start + needed; | |
1162 | } | |
1163 | ||
1164 | static int table_deps(struct dm_ioctl *param, size_t param_size) | |
1165 | { | |
1166 | int r = 0; | |
1167 | struct mapped_device *md; | |
1168 | struct dm_table *table; | |
1169 | ||
1170 | md = find_device(param); | |
1171 | if (!md) | |
1172 | return -ENXIO; | |
1173 | ||
1174 | r = __dev_status(md, param); | |
1175 | if (r) | |
1176 | goto out; | |
1177 | ||
1178 | table = dm_get_table(md); | |
1179 | if (table) { | |
1180 | retrieve_deps(table, param, param_size); | |
1181 | dm_table_put(table); | |
1182 | } | |
1183 | ||
1184 | out: | |
1185 | dm_put(md); | |
1186 | return r; | |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * Return the status of a device as a text string for each | |
1191 | * target. | |
1192 | */ | |
1193 | static int table_status(struct dm_ioctl *param, size_t param_size) | |
1194 | { | |
1195 | int r; | |
1196 | struct mapped_device *md; | |
1197 | struct dm_table *table; | |
1198 | ||
1199 | md = find_device(param); | |
1200 | if (!md) | |
1201 | return -ENXIO; | |
1202 | ||
1203 | r = __dev_status(md, param); | |
1204 | if (r) | |
1205 | goto out; | |
1206 | ||
1207 | table = dm_get_table(md); | |
1208 | if (table) { | |
1209 | retrieve_status(table, param, param_size); | |
1210 | dm_table_put(table); | |
1211 | } | |
1212 | ||
1213 | out: | |
1214 | dm_put(md); | |
1215 | return r; | |
1216 | } | |
1217 | ||
1218 | /* | |
1219 | * Pass a message to the target that's at the supplied device offset. | |
1220 | */ | |
1221 | static int target_message(struct dm_ioctl *param, size_t param_size) | |
1222 | { | |
1223 | int r, argc; | |
1224 | char **argv; | |
1225 | struct mapped_device *md; | |
1226 | struct dm_table *table; | |
1227 | struct dm_target *ti; | |
1228 | struct dm_target_msg *tmsg = (void *) param + param->data_start; | |
1229 | ||
1230 | md = find_device(param); | |
1231 | if (!md) | |
1232 | return -ENXIO; | |
1233 | ||
1234 | r = __dev_status(md, param); | |
1235 | if (r) | |
1236 | goto out; | |
1237 | ||
027d50f9 | 1238 | if (tmsg < (struct dm_target_msg *) param->data || |
1da177e4 LT |
1239 | invalid_str(tmsg->message, (void *) param + param_size)) { |
1240 | DMWARN("Invalid target message parameters."); | |
1241 | r = -EINVAL; | |
1242 | goto out; | |
1243 | } | |
1244 | ||
1245 | r = dm_split_args(&argc, &argv, tmsg->message); | |
1246 | if (r) { | |
1247 | DMWARN("Failed to split target message parameters"); | |
1248 | goto out; | |
1249 | } | |
1250 | ||
1251 | table = dm_get_table(md); | |
1252 | if (!table) | |
1253 | goto out_argv; | |
1254 | ||
512875bd JN |
1255 | ti = dm_table_find_target(table, tmsg->sector); |
1256 | if (!dm_target_is_valid(ti)) { | |
1da177e4 LT |
1257 | DMWARN("Target message sector outside device."); |
1258 | r = -EINVAL; | |
512875bd | 1259 | } else if (ti->type->message) |
1da177e4 LT |
1260 | r = ti->type->message(ti, argc, argv); |
1261 | else { | |
1262 | DMWARN("Target type does not support messages"); | |
1263 | r = -EINVAL; | |
1264 | } | |
1265 | ||
1da177e4 LT |
1266 | dm_table_put(table); |
1267 | out_argv: | |
1268 | kfree(argv); | |
1269 | out: | |
1270 | param->data_size = 0; | |
1271 | dm_put(md); | |
1272 | return r; | |
1273 | } | |
1274 | ||
1275 | /*----------------------------------------------------------------- | |
1276 | * Implementation of open/close/ioctl on the special char | |
1277 | * device. | |
1278 | *---------------------------------------------------------------*/ | |
1279 | static ioctl_fn lookup_ioctl(unsigned int cmd) | |
1280 | { | |
1281 | static struct { | |
1282 | int cmd; | |
1283 | ioctl_fn fn; | |
1284 | } _ioctls[] = { | |
1285 | {DM_VERSION_CMD, NULL}, /* version is dealt with elsewhere */ | |
1286 | {DM_REMOVE_ALL_CMD, remove_all}, | |
1287 | {DM_LIST_DEVICES_CMD, list_devices}, | |
1288 | ||
1289 | {DM_DEV_CREATE_CMD, dev_create}, | |
1290 | {DM_DEV_REMOVE_CMD, dev_remove}, | |
1291 | {DM_DEV_RENAME_CMD, dev_rename}, | |
1292 | {DM_DEV_SUSPEND_CMD, dev_suspend}, | |
1293 | {DM_DEV_STATUS_CMD, dev_status}, | |
1294 | {DM_DEV_WAIT_CMD, dev_wait}, | |
1295 | ||
1296 | {DM_TABLE_LOAD_CMD, table_load}, | |
1297 | {DM_TABLE_CLEAR_CMD, table_clear}, | |
1298 | {DM_TABLE_DEPS_CMD, table_deps}, | |
1299 | {DM_TABLE_STATUS_CMD, table_status}, | |
1300 | ||
1301 | {DM_LIST_VERSIONS_CMD, list_versions}, | |
1302 | ||
3ac51e74 DW |
1303 | {DM_TARGET_MSG_CMD, target_message}, |
1304 | {DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry} | |
1da177e4 LT |
1305 | }; |
1306 | ||
1307 | return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn; | |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * As well as checking the version compatibility this always | |
1312 | * copies the kernel interface version out. | |
1313 | */ | |
1314 | static int check_version(unsigned int cmd, struct dm_ioctl __user *user) | |
1315 | { | |
1316 | uint32_t version[3]; | |
1317 | int r = 0; | |
1318 | ||
1319 | if (copy_from_user(version, user->version, sizeof(version))) | |
1320 | return -EFAULT; | |
1321 | ||
1322 | if ((DM_VERSION_MAJOR != version[0]) || | |
1323 | (DM_VERSION_MINOR < version[1])) { | |
1324 | DMWARN("ioctl interface mismatch: " | |
1325 | "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)", | |
1326 | DM_VERSION_MAJOR, DM_VERSION_MINOR, | |
1327 | DM_VERSION_PATCHLEVEL, | |
1328 | version[0], version[1], version[2], cmd); | |
1329 | r = -EINVAL; | |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * Fill in the kernel version. | |
1334 | */ | |
1335 | version[0] = DM_VERSION_MAJOR; | |
1336 | version[1] = DM_VERSION_MINOR; | |
1337 | version[2] = DM_VERSION_PATCHLEVEL; | |
1338 | if (copy_to_user(user->version, version, sizeof(version))) | |
1339 | return -EFAULT; | |
1340 | ||
1341 | return r; | |
1342 | } | |
1343 | ||
1344 | static void free_params(struct dm_ioctl *param) | |
1345 | { | |
1346 | vfree(param); | |
1347 | } | |
1348 | ||
1349 | static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param) | |
1350 | { | |
1351 | struct dm_ioctl tmp, *dmi; | |
1352 | ||
1353 | if (copy_from_user(&tmp, user, sizeof(tmp))) | |
1354 | return -EFAULT; | |
1355 | ||
1356 | if (tmp.data_size < sizeof(tmp)) | |
1357 | return -EINVAL; | |
1358 | ||
bb56acf8 | 1359 | dmi = vmalloc(tmp.data_size); |
1da177e4 LT |
1360 | if (!dmi) |
1361 | return -ENOMEM; | |
1362 | ||
1363 | if (copy_from_user(dmi, user, tmp.data_size)) { | |
1364 | vfree(dmi); | |
1365 | return -EFAULT; | |
1366 | } | |
1367 | ||
1368 | *param = dmi; | |
1369 | return 0; | |
1370 | } | |
1371 | ||
1372 | static int validate_params(uint cmd, struct dm_ioctl *param) | |
1373 | { | |
1374 | /* Always clear this flag */ | |
1375 | param->flags &= ~DM_BUFFER_FULL_FLAG; | |
1376 | ||
1377 | /* Ignores parameters */ | |
1378 | if (cmd == DM_REMOVE_ALL_CMD || | |
1379 | cmd == DM_LIST_DEVICES_CMD || | |
1380 | cmd == DM_LIST_VERSIONS_CMD) | |
1381 | return 0; | |
1382 | ||
1383 | if ((cmd == DM_DEV_CREATE_CMD)) { | |
1384 | if (!*param->name) { | |
1385 | DMWARN("name not supplied when creating device"); | |
1386 | return -EINVAL; | |
1387 | } | |
1388 | } else if ((*param->uuid && *param->name)) { | |
1389 | DMWARN("only supply one of name or uuid, cmd(%u)", cmd); | |
1390 | return -EINVAL; | |
1391 | } | |
1392 | ||
1393 | /* Ensure strings are terminated */ | |
1394 | param->name[DM_NAME_LEN - 1] = '\0'; | |
1395 | param->uuid[DM_UUID_LEN - 1] = '\0'; | |
1396 | ||
1397 | return 0; | |
1398 | } | |
1399 | ||
1400 | static int ctl_ioctl(struct inode *inode, struct file *file, | |
1401 | uint command, ulong u) | |
1402 | { | |
1403 | int r = 0; | |
1404 | unsigned int cmd; | |
1405 | struct dm_ioctl *param; | |
1406 | struct dm_ioctl __user *user = (struct dm_ioctl __user *) u; | |
1407 | ioctl_fn fn = NULL; | |
1408 | size_t param_size; | |
1409 | ||
1410 | /* only root can play with this */ | |
1411 | if (!capable(CAP_SYS_ADMIN)) | |
1412 | return -EACCES; | |
1413 | ||
1414 | if (_IOC_TYPE(command) != DM_IOCTL) | |
1415 | return -ENOTTY; | |
1416 | ||
1417 | cmd = _IOC_NR(command); | |
1418 | ||
1419 | /* | |
1420 | * Check the interface version passed in. This also | |
1421 | * writes out the kernel's interface version. | |
1422 | */ | |
1423 | r = check_version(cmd, user); | |
1424 | if (r) | |
1425 | return r; | |
1426 | ||
1427 | /* | |
1428 | * Nothing more to do for the version command. | |
1429 | */ | |
1430 | if (cmd == DM_VERSION_CMD) | |
1431 | return 0; | |
1432 | ||
1433 | fn = lookup_ioctl(cmd); | |
1434 | if (!fn) { | |
1435 | DMWARN("dm_ctl_ioctl: unknown command 0x%x", command); | |
1436 | return -ENOTTY; | |
1437 | } | |
1438 | ||
1439 | /* | |
1440 | * Trying to avoid low memory issues when a device is | |
1441 | * suspended. | |
1442 | */ | |
1443 | current->flags |= PF_MEMALLOC; | |
1444 | ||
1445 | /* | |
1446 | * Copy the parameters into kernel space. | |
1447 | */ | |
1448 | r = copy_params(user, ¶m); | |
1da177e4 | 1449 | |
dab6a429 AK |
1450 | current->flags &= ~PF_MEMALLOC; |
1451 | ||
1452 | if (r) | |
1453 | return r; | |
1da177e4 LT |
1454 | |
1455 | r = validate_params(cmd, param); | |
1456 | if (r) | |
1457 | goto out; | |
1458 | ||
1459 | param_size = param->data_size; | |
1460 | param->data_size = sizeof(*param); | |
1461 | r = fn(param, param_size); | |
1462 | ||
1463 | /* | |
1464 | * Copy the results back to userland. | |
1465 | */ | |
1466 | if (!r && copy_to_user(user, param, param->data_size)) | |
1467 | r = -EFAULT; | |
1468 | ||
1469 | out: | |
1470 | free_params(param); | |
1da177e4 LT |
1471 | return r; |
1472 | } | |
1473 | ||
fa027c2a | 1474 | static const struct file_operations _ctl_fops = { |
1da177e4 LT |
1475 | .ioctl = ctl_ioctl, |
1476 | .owner = THIS_MODULE, | |
1477 | }; | |
1478 | ||
1479 | static struct miscdevice _dm_misc = { | |
1480 | .minor = MISC_DYNAMIC_MINOR, | |
1481 | .name = DM_NAME, | |
1da177e4 LT |
1482 | .fops = &_ctl_fops |
1483 | }; | |
1484 | ||
1485 | /* | |
1486 | * Create misc character device and link to DM_DIR/control. | |
1487 | */ | |
1488 | int __init dm_interface_init(void) | |
1489 | { | |
1490 | int r; | |
1491 | ||
1492 | r = dm_hash_init(); | |
1493 | if (r) | |
1494 | return r; | |
1495 | ||
1496 | r = misc_register(&_dm_misc); | |
1497 | if (r) { | |
1498 | DMERR("misc_register failed for control device"); | |
1499 | dm_hash_exit(); | |
1500 | return r; | |
1501 | } | |
1502 | ||
1503 | DMINFO("%d.%d.%d%s initialised: %s", DM_VERSION_MAJOR, | |
1504 | DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, DM_VERSION_EXTRA, | |
1505 | DM_DRIVER_EMAIL); | |
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | void dm_interface_exit(void) | |
1510 | { | |
1511 | if (misc_deregister(&_dm_misc) < 0) | |
1512 | DMERR("misc_deregister failed for control device"); | |
1513 | ||
1514 | dm_hash_exit(); | |
1515 | } | |
96a1f7db MA |
1516 | |
1517 | /** | |
1518 | * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers | |
1519 | * @md: Pointer to mapped_device | |
1520 | * @name: Buffer (size DM_NAME_LEN) for name | |
1521 | * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined | |
1522 | */ | |
1523 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) | |
1524 | { | |
1525 | int r = 0; | |
1526 | struct hash_cell *hc; | |
1527 | ||
1528 | if (!md) | |
1529 | return -ENXIO; | |
1530 | ||
1531 | dm_get(md); | |
1532 | down_read(&_hash_lock); | |
1533 | hc = dm_get_mdptr(md); | |
1534 | if (!hc || hc->md != md) { | |
1535 | r = -ENXIO; | |
1536 | goto out; | |
1537 | } | |
1538 | ||
1539 | strcpy(name, hc->name); | |
1540 | strcpy(uuid, hc->uuid ? : ""); | |
1541 | ||
1542 | out: | |
1543 | up_read(&_hash_lock); | |
1544 | dm_put(md); | |
1545 | ||
1546 | return r; | |
1547 | } |