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 | ||
4cc96131 | 8 | #include "dm-core.h" |
91ccbbac | 9 | #include "dm-ima.h" |
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/vmalloc.h> | |
12 | #include <linux/miscdevice.h> | |
5b3cc15a | 13 | #include <linux/sched/mm.h> |
1da177e4 LT |
14 | #include <linux/init.h> |
15 | #include <linux/wait.h> | |
16 | #include <linux/slab.h> | |
b82096af | 17 | #include <linux/rbtree.h> |
1da177e4 | 18 | #include <linux/dm-ioctl.h> |
3ac51e74 | 19 | #include <linux/hdreg.h> |
76c072b4 | 20 | #include <linux/compat.h> |
cd9c88da | 21 | #include <linux/nospec.h> |
1da177e4 | 22 | |
7c0f6ba6 | 23 | #include <linux/uaccess.h> |
91ccbbac | 24 | #include <linux/ima.h> |
1da177e4 | 25 | |
72d94861 | 26 | #define DM_MSG_PREFIX "ioctl" |
1da177e4 LT |
27 | #define DM_DRIVER_EMAIL "dm-devel@redhat.com" |
28 | ||
93e6442c MP |
29 | struct dm_file { |
30 | /* | |
31 | * poll will wait until the global event number is greater than | |
32 | * this value. | |
33 | */ | |
fc1841e1 | 34 | volatile unsigned global_event_nr; |
93e6442c MP |
35 | }; |
36 | ||
1da177e4 LT |
37 | /*----------------------------------------------------------------- |
38 | * The ioctl interface needs to be able to look up devices by | |
39 | * name or uuid. | |
40 | *---------------------------------------------------------------*/ | |
41 | struct hash_cell { | |
b82096af MP |
42 | struct rb_node name_node; |
43 | struct rb_node uuid_node; | |
44 | bool name_set; | |
45 | bool uuid_set; | |
1da177e4 LT |
46 | |
47 | char *name; | |
48 | char *uuid; | |
49 | struct mapped_device *md; | |
50 | struct dm_table *new_map; | |
51 | }; | |
52 | ||
53 | struct vers_iter { | |
54 | size_t param_size; | |
55 | struct dm_target_versions *vers, *old_vers; | |
56 | char *end; | |
57 | uint32_t flags; | |
58 | }; | |
59 | ||
60 | ||
b82096af MP |
61 | static struct rb_root name_rb_tree = RB_ROOT; |
62 | static struct rb_root uuid_rb_tree = RB_ROOT; | |
1da177e4 | 63 | |
2c140a24 | 64 | static void dm_hash_remove_all(bool keep_open_devices, bool mark_deferred, bool only_deferred); |
1da177e4 LT |
65 | |
66 | /* | |
67 | * Guards access to both hash tables. | |
68 | */ | |
69 | static DECLARE_RWSEM(_hash_lock); | |
70 | ||
6076905b MP |
71 | /* |
72 | * Protects use of mdptr to obtain hash cell name and uuid from mapped device. | |
73 | */ | |
74 | static DEFINE_MUTEX(dm_hash_cells_mutex); | |
75 | ||
1da177e4 LT |
76 | static void dm_hash_exit(void) |
77 | { | |
2c140a24 | 78 | dm_hash_remove_all(false, false, false); |
1da177e4 LT |
79 | } |
80 | ||
1da177e4 LT |
81 | /*----------------------------------------------------------------- |
82 | * Code for looking up a device by name | |
83 | *---------------------------------------------------------------*/ | |
84 | static struct hash_cell *__get_name_cell(const char *str) | |
85 | { | |
b82096af | 86 | struct rb_node *n = name_rb_tree.rb_node; |
1da177e4 | 87 | |
b82096af MP |
88 | while (n) { |
89 | struct hash_cell *hc = container_of(n, struct hash_cell, name_node); | |
90 | int c = strcmp(hc->name, str); | |
91 | if (!c) { | |
7ec75f25 | 92 | dm_get(hc->md); |
1da177e4 | 93 | return hc; |
7ec75f25 | 94 | } |
b82096af MP |
95 | n = c >= 0 ? n->rb_left : n->rb_right; |
96 | } | |
1da177e4 LT |
97 | |
98 | return NULL; | |
99 | } | |
100 | ||
101 | static struct hash_cell *__get_uuid_cell(const char *str) | |
102 | { | |
b82096af | 103 | struct rb_node *n = uuid_rb_tree.rb_node; |
1da177e4 | 104 | |
b82096af MP |
105 | while (n) { |
106 | struct hash_cell *hc = container_of(n, struct hash_cell, uuid_node); | |
107 | int c = strcmp(hc->uuid, str); | |
108 | if (!c) { | |
7ec75f25 | 109 | dm_get(hc->md); |
1da177e4 | 110 | return hc; |
7ec75f25 | 111 | } |
b82096af MP |
112 | n = c >= 0 ? n->rb_left : n->rb_right; |
113 | } | |
1da177e4 LT |
114 | |
115 | return NULL; | |
116 | } | |
117 | ||
b82096af MP |
118 | static void __unlink_name(struct hash_cell *hc) |
119 | { | |
120 | if (hc->name_set) { | |
121 | hc->name_set = false; | |
122 | rb_erase(&hc->name_node, &name_rb_tree); | |
123 | } | |
124 | } | |
125 | ||
126 | static void __unlink_uuid(struct hash_cell *hc) | |
127 | { | |
128 | if (hc->uuid_set) { | |
129 | hc->uuid_set = false; | |
130 | rb_erase(&hc->uuid_node, &uuid_rb_tree); | |
131 | } | |
132 | } | |
133 | ||
134 | static void __link_name(struct hash_cell *new_hc) | |
135 | { | |
136 | struct rb_node **n, *parent; | |
137 | ||
138 | __unlink_name(new_hc); | |
139 | ||
140 | new_hc->name_set = true; | |
141 | ||
142 | n = &name_rb_tree.rb_node; | |
143 | parent = NULL; | |
144 | ||
145 | while (*n) { | |
146 | struct hash_cell *hc = container_of(*n, struct hash_cell, name_node); | |
147 | int c = strcmp(hc->name, new_hc->name); | |
148 | BUG_ON(!c); | |
149 | parent = *n; | |
150 | n = c >= 0 ? &hc->name_node.rb_left : &hc->name_node.rb_right; | |
151 | } | |
152 | ||
153 | rb_link_node(&new_hc->name_node, parent, n); | |
154 | rb_insert_color(&new_hc->name_node, &name_rb_tree); | |
155 | } | |
156 | ||
157 | static void __link_uuid(struct hash_cell *new_hc) | |
158 | { | |
159 | struct rb_node **n, *parent; | |
160 | ||
161 | __unlink_uuid(new_hc); | |
162 | ||
163 | new_hc->uuid_set = true; | |
164 | ||
165 | n = &uuid_rb_tree.rb_node; | |
166 | parent = NULL; | |
167 | ||
168 | while (*n) { | |
169 | struct hash_cell *hc = container_of(*n, struct hash_cell, uuid_node); | |
170 | int c = strcmp(hc->uuid, new_hc->uuid); | |
171 | BUG_ON(!c); | |
172 | parent = *n; | |
173 | n = c > 0 ? &hc->uuid_node.rb_left : &hc->uuid_node.rb_right; | |
174 | } | |
175 | ||
176 | rb_link_node(&new_hc->uuid_node, parent, n); | |
177 | rb_insert_color(&new_hc->uuid_node, &uuid_rb_tree); | |
178 | } | |
179 | ||
ba2e19b0 MP |
180 | static struct hash_cell *__get_dev_cell(uint64_t dev) |
181 | { | |
182 | struct mapped_device *md; | |
183 | struct hash_cell *hc; | |
184 | ||
185 | md = dm_get_md(huge_decode_dev(dev)); | |
186 | if (!md) | |
187 | return NULL; | |
188 | ||
189 | hc = dm_get_mdptr(md); | |
190 | if (!hc) { | |
191 | dm_put(md); | |
192 | return NULL; | |
193 | } | |
194 | ||
195 | return hc; | |
196 | } | |
197 | ||
1da177e4 LT |
198 | /*----------------------------------------------------------------- |
199 | * Inserting, removing and renaming a device. | |
200 | *---------------------------------------------------------------*/ | |
1da177e4 LT |
201 | static struct hash_cell *alloc_cell(const char *name, const char *uuid, |
202 | struct mapped_device *md) | |
203 | { | |
204 | struct hash_cell *hc; | |
205 | ||
206 | hc = kmalloc(sizeof(*hc), GFP_KERNEL); | |
207 | if (!hc) | |
208 | return NULL; | |
209 | ||
543537bd | 210 | hc->name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
211 | if (!hc->name) { |
212 | kfree(hc); | |
213 | return NULL; | |
214 | } | |
215 | ||
216 | if (!uuid) | |
217 | hc->uuid = NULL; | |
218 | ||
219 | else { | |
543537bd | 220 | hc->uuid = kstrdup(uuid, GFP_KERNEL); |
1da177e4 LT |
221 | if (!hc->uuid) { |
222 | kfree(hc->name); | |
223 | kfree(hc); | |
224 | return NULL; | |
225 | } | |
226 | } | |
227 | ||
b82096af | 228 | hc->name_set = hc->uuid_set = false; |
1da177e4 LT |
229 | hc->md = md; |
230 | hc->new_map = NULL; | |
231 | return hc; | |
232 | } | |
233 | ||
234 | static void free_cell(struct hash_cell *hc) | |
235 | { | |
236 | if (hc) { | |
237 | kfree(hc->name); | |
238 | kfree(hc->uuid); | |
239 | kfree(hc); | |
240 | } | |
241 | } | |
242 | ||
1da177e4 LT |
243 | /* |
244 | * The kdev_t and uuid of a device can never change once it is | |
245 | * initially inserted. | |
246 | */ | |
247 | static int dm_hash_insert(const char *name, const char *uuid, struct mapped_device *md) | |
248 | { | |
7ec75f25 | 249 | struct hash_cell *cell, *hc; |
1da177e4 LT |
250 | |
251 | /* | |
252 | * Allocate the new cells. | |
253 | */ | |
254 | cell = alloc_cell(name, uuid, md); | |
255 | if (!cell) | |
256 | return -ENOMEM; | |
257 | ||
258 | /* | |
259 | * Insert the cell into both hash tables. | |
260 | */ | |
261 | down_write(&_hash_lock); | |
7ec75f25 JM |
262 | hc = __get_name_cell(name); |
263 | if (hc) { | |
264 | dm_put(hc->md); | |
1da177e4 | 265 | goto bad; |
7ec75f25 | 266 | } |
1da177e4 | 267 | |
b82096af | 268 | __link_name(cell); |
1da177e4 LT |
269 | |
270 | if (uuid) { | |
7ec75f25 JM |
271 | hc = __get_uuid_cell(uuid); |
272 | if (hc) { | |
b82096af | 273 | __unlink_name(cell); |
7ec75f25 | 274 | dm_put(hc->md); |
1da177e4 LT |
275 | goto bad; |
276 | } | |
b82096af | 277 | __link_uuid(cell); |
1da177e4 | 278 | } |
1da177e4 | 279 | dm_get(md); |
6076905b | 280 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 281 | dm_set_mdptr(md, cell); |
6076905b | 282 | mutex_unlock(&dm_hash_cells_mutex); |
1da177e4 LT |
283 | up_write(&_hash_lock); |
284 | ||
285 | return 0; | |
286 | ||
287 | bad: | |
288 | up_write(&_hash_lock); | |
289 | free_cell(cell); | |
290 | return -EBUSY; | |
291 | } | |
292 | ||
83d5e5b0 | 293 | static struct dm_table *__hash_remove(struct hash_cell *hc) |
1da177e4 | 294 | { |
269fd2a6 | 295 | struct dm_table *table; |
83d5e5b0 | 296 | int srcu_idx; |
269fd2a6 | 297 | |
b82096af MP |
298 | /* remove from the dev trees */ |
299 | __unlink_name(hc); | |
300 | __unlink_uuid(hc); | |
6076905b | 301 | mutex_lock(&dm_hash_cells_mutex); |
1da177e4 | 302 | dm_set_mdptr(hc->md, NULL); |
6076905b | 303 | mutex_unlock(&dm_hash_cells_mutex); |
269fd2a6 | 304 | |
83d5e5b0 MP |
305 | table = dm_get_live_table(hc->md, &srcu_idx); |
306 | if (table) | |
269fd2a6 | 307 | dm_table_event(table); |
83d5e5b0 | 308 | dm_put_live_table(hc->md, srcu_idx); |
269fd2a6 | 309 | |
83d5e5b0 | 310 | table = NULL; |
1da177e4 | 311 | if (hc->new_map) |
83d5e5b0 | 312 | table = hc->new_map; |
1134e5ae | 313 | dm_put(hc->md); |
1da177e4 | 314 | free_cell(hc); |
83d5e5b0 MP |
315 | |
316 | return table; | |
1da177e4 LT |
317 | } |
318 | ||
2c140a24 | 319 | static void dm_hash_remove_all(bool keep_open_devices, bool mark_deferred, bool only_deferred) |
1da177e4 | 320 | { |
b82096af MP |
321 | int dev_skipped; |
322 | struct rb_node *n; | |
1da177e4 | 323 | struct hash_cell *hc; |
98f33285 | 324 | struct mapped_device *md; |
83d5e5b0 | 325 | struct dm_table *t; |
98f33285 KU |
326 | |
327 | retry: | |
328 | dev_skipped = 0; | |
1da177e4 LT |
329 | |
330 | down_write(&_hash_lock); | |
5c6bd75d | 331 | |
b82096af MP |
332 | for (n = rb_first(&name_rb_tree); n; n = rb_next(n)) { |
333 | hc = container_of(n, struct hash_cell, name_node); | |
334 | md = hc->md; | |
335 | dm_get(md); | |
5c6bd75d | 336 | |
b82096af MP |
337 | if (keep_open_devices && |
338 | dm_lock_for_deletion(md, mark_deferred, only_deferred)) { | |
339 | dm_put(md); | |
340 | dev_skipped++; | |
341 | continue; | |
342 | } | |
98f33285 | 343 | |
b82096af | 344 | t = __hash_remove(hc); |
5c6bd75d | 345 | |
b82096af | 346 | up_write(&_hash_lock); |
5c6bd75d | 347 | |
b82096af MP |
348 | if (t) { |
349 | dm_sync_table(md); | |
350 | dm_table_destroy(t); | |
98f33285 | 351 | } |
84010e51 | 352 | dm_ima_measure_on_device_remove(md, true); |
b82096af MP |
353 | dm_put(md); |
354 | if (likely(keep_open_devices)) | |
355 | dm_destroy(md); | |
356 | else | |
357 | dm_destroy_immediate(md); | |
358 | ||
359 | /* | |
360 | * Some mapped devices may be using other mapped | |
361 | * devices, so repeat until we make no further | |
362 | * progress. If a new mapped device is created | |
363 | * here it will also get removed. | |
364 | */ | |
365 | goto retry; | |
5c6bd75d AK |
366 | } |
367 | ||
1da177e4 | 368 | up_write(&_hash_lock); |
98f33285 KU |
369 | |
370 | if (dev_skipped) | |
371 | DMWARN("remove_all left %d open device(s)", dev_skipped); | |
1da177e4 LT |
372 | } |
373 | ||
84c89557 PJ |
374 | /* |
375 | * Set the uuid of a hash_cell that isn't already set. | |
376 | */ | |
377 | static void __set_cell_uuid(struct hash_cell *hc, char *new_uuid) | |
378 | { | |
379 | mutex_lock(&dm_hash_cells_mutex); | |
380 | hc->uuid = new_uuid; | |
381 | mutex_unlock(&dm_hash_cells_mutex); | |
382 | ||
b82096af | 383 | __link_uuid(hc); |
84c89557 PJ |
384 | } |
385 | ||
386 | /* | |
387 | * Changes the name of a hash_cell and returns the old name for | |
388 | * the caller to free. | |
389 | */ | |
390 | static char *__change_cell_name(struct hash_cell *hc, char *new_name) | |
391 | { | |
392 | char *old_name; | |
393 | ||
394 | /* | |
395 | * Rename and move the name cell. | |
396 | */ | |
b82096af | 397 | __unlink_name(hc); |
84c89557 PJ |
398 | old_name = hc->name; |
399 | ||
400 | mutex_lock(&dm_hash_cells_mutex); | |
401 | hc->name = new_name; | |
402 | mutex_unlock(&dm_hash_cells_mutex); | |
403 | ||
b82096af | 404 | __link_name(hc); |
84c89557 PJ |
405 | |
406 | return old_name; | |
407 | } | |
408 | ||
856a6f1d PR |
409 | static struct mapped_device *dm_hash_rename(struct dm_ioctl *param, |
410 | const char *new) | |
1da177e4 | 411 | { |
84c89557 | 412 | char *new_data, *old_name = NULL; |
1da177e4 | 413 | struct hash_cell *hc; |
81f1777a | 414 | struct dm_table *table; |
856a6f1d | 415 | struct mapped_device *md; |
84c89557 | 416 | unsigned change_uuid = (param->flags & DM_UUID_FLAG) ? 1 : 0; |
83d5e5b0 | 417 | int srcu_idx; |
1da177e4 LT |
418 | |
419 | /* | |
420 | * duplicate new. | |
421 | */ | |
84c89557 PJ |
422 | new_data = kstrdup(new, GFP_KERNEL); |
423 | if (!new_data) | |
856a6f1d | 424 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
425 | |
426 | down_write(&_hash_lock); | |
427 | ||
428 | /* | |
429 | * Is new free ? | |
430 | */ | |
84c89557 PJ |
431 | if (change_uuid) |
432 | hc = __get_uuid_cell(new); | |
433 | else | |
434 | hc = __get_name_cell(new); | |
435 | ||
1da177e4 | 436 | if (hc) { |
84c89557 PJ |
437 | DMWARN("Unable to change %s on mapped device %s to one that " |
438 | "already exists: %s", | |
439 | change_uuid ? "uuid" : "name", | |
856a6f1d | 440 | param->name, new); |
7ec75f25 | 441 | dm_put(hc->md); |
1da177e4 | 442 | up_write(&_hash_lock); |
84c89557 | 443 | kfree(new_data); |
856a6f1d | 444 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
445 | } |
446 | ||
447 | /* | |
448 | * Is there such a device as 'old' ? | |
449 | */ | |
856a6f1d | 450 | hc = __get_name_cell(param->name); |
1da177e4 | 451 | if (!hc) { |
84c89557 PJ |
452 | DMWARN("Unable to rename non-existent device, %s to %s%s", |
453 | param->name, change_uuid ? "uuid " : "", new); | |
1da177e4 | 454 | up_write(&_hash_lock); |
84c89557 | 455 | kfree(new_data); |
856a6f1d | 456 | return ERR_PTR(-ENXIO); |
1da177e4 LT |
457 | } |
458 | ||
459 | /* | |
84c89557 | 460 | * Does this device already have a uuid? |
1da177e4 | 461 | */ |
84c89557 PJ |
462 | if (change_uuid && hc->uuid) { |
463 | DMWARN("Unable to change uuid of mapped device %s to %s " | |
464 | "because uuid is already set to %s", | |
465 | param->name, new, hc->uuid); | |
466 | dm_put(hc->md); | |
467 | up_write(&_hash_lock); | |
468 | kfree(new_data); | |
469 | return ERR_PTR(-EINVAL); | |
470 | } | |
471 | ||
472 | if (change_uuid) | |
473 | __set_cell_uuid(hc, new_data); | |
474 | else | |
475 | old_name = __change_cell_name(hc, new_data); | |
1da177e4 | 476 | |
81f1777a | 477 | /* |
478 | * Wake up any dm event waiters. | |
479 | */ | |
83d5e5b0 MP |
480 | table = dm_get_live_table(hc->md, &srcu_idx); |
481 | if (table) | |
81f1777a | 482 | dm_table_event(table); |
83d5e5b0 | 483 | dm_put_live_table(hc->md, srcu_idx); |
81f1777a | 484 | |
856a6f1d PR |
485 | if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, param->event_nr)) |
486 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
69267a30 | 487 | |
856a6f1d | 488 | md = hc->md; |
7d1d1df8 TS |
489 | |
490 | dm_ima_measure_on_device_rename(md); | |
491 | ||
1da177e4 LT |
492 | up_write(&_hash_lock); |
493 | kfree(old_name); | |
856a6f1d PR |
494 | |
495 | return md; | |
1da177e4 LT |
496 | } |
497 | ||
2c140a24 MP |
498 | void dm_deferred_remove(void) |
499 | { | |
500 | dm_hash_remove_all(true, false, true); | |
501 | } | |
502 | ||
1da177e4 LT |
503 | /*----------------------------------------------------------------- |
504 | * Implementation of the ioctl commands | |
505 | *---------------------------------------------------------------*/ | |
506 | /* | |
507 | * All the ioctl commands get dispatched to functions with this | |
508 | * prototype. | |
509 | */ | |
fc1841e1 | 510 | typedef int (*ioctl_fn)(struct file *filp, struct dm_ioctl *param, size_t param_size); |
1da177e4 | 511 | |
fc1841e1 | 512 | static int remove_all(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 | 513 | { |
2c140a24 | 514 | dm_hash_remove_all(true, !!(param->flags & DM_DEFERRED_REMOVE), false); |
1da177e4 LT |
515 | param->data_size = 0; |
516 | return 0; | |
517 | } | |
518 | ||
519 | /* | |
520 | * Round up the ptr to an 8-byte boundary. | |
521 | */ | |
522 | #define ALIGN_MASK 7 | |
62e08243 MP |
523 | static inline size_t align_val(size_t val) |
524 | { | |
525 | return (val + ALIGN_MASK) & ~ALIGN_MASK; | |
526 | } | |
1da177e4 LT |
527 | static inline void *align_ptr(void *ptr) |
528 | { | |
62e08243 | 529 | return (void *)align_val((size_t)ptr); |
1da177e4 LT |
530 | } |
531 | ||
532 | /* | |
533 | * Retrieves the data payload buffer from an already allocated | |
534 | * struct dm_ioctl. | |
535 | */ | |
536 | static void *get_result_buffer(struct dm_ioctl *param, size_t param_size, | |
537 | size_t *len) | |
538 | { | |
539 | param->data_start = align_ptr(param + 1) - (void *) param; | |
540 | ||
541 | if (param->data_start < param_size) | |
542 | *len = param_size - param->data_start; | |
543 | else | |
544 | *len = 0; | |
545 | ||
546 | return ((void *) param) + param->data_start; | |
547 | } | |
548 | ||
c909085b MP |
549 | static bool filter_device(struct hash_cell *hc, const char *pfx_name, const char *pfx_uuid) |
550 | { | |
551 | const char *val; | |
552 | size_t val_len, pfx_len; | |
553 | ||
554 | val = hc->name; | |
555 | val_len = strlen(val); | |
556 | pfx_len = strnlen(pfx_name, DM_NAME_LEN); | |
557 | if (pfx_len > val_len) | |
558 | return false; | |
559 | if (memcmp(val, pfx_name, pfx_len)) | |
560 | return false; | |
561 | ||
562 | val = hc->uuid ? hc->uuid : ""; | |
563 | val_len = strlen(val); | |
564 | pfx_len = strnlen(pfx_uuid, DM_UUID_LEN); | |
565 | if (pfx_len > val_len) | |
566 | return false; | |
567 | if (memcmp(val, pfx_uuid, pfx_len)) | |
568 | return false; | |
569 | ||
570 | return true; | |
571 | } | |
572 | ||
fc1841e1 | 573 | static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 | 574 | { |
b82096af | 575 | struct rb_node *n; |
1da177e4 LT |
576 | struct hash_cell *hc; |
577 | size_t len, needed = 0; | |
578 | struct gendisk *disk; | |
62e08243 | 579 | struct dm_name_list *orig_nl, *nl, *old_nl = NULL; |
23d70c5e | 580 | uint32_t *event_nr; |
1da177e4 LT |
581 | |
582 | down_write(&_hash_lock); | |
583 | ||
584 | /* | |
585 | * Loop through all the devices working out how much | |
586 | * space we need. | |
587 | */ | |
b82096af MP |
588 | for (n = rb_first(&name_rb_tree); n; n = rb_next(n)) { |
589 | hc = container_of(n, struct hash_cell, name_node); | |
c909085b MP |
590 | if (!filter_device(hc, param->name, param->uuid)) |
591 | continue; | |
b82096af | 592 | needed += align_val(offsetof(struct dm_name_list, name) + strlen(hc->name) + 1); |
8b638081 MP |
593 | needed += align_val(sizeof(uint32_t) * 2); |
594 | if (param->flags & DM_UUID_FLAG && hc->uuid) | |
595 | needed += align_val(strlen(hc->uuid) + 1); | |
1da177e4 LT |
596 | } |
597 | ||
598 | /* | |
599 | * Grab our output buffer. | |
600 | */ | |
62e08243 | 601 | nl = orig_nl = get_result_buffer(param, param_size, &len); |
4edbe1d7 | 602 | if (len < needed || len < sizeof(nl->dev)) { |
1da177e4 LT |
603 | param->flags |= DM_BUFFER_FULL_FLAG; |
604 | goto out; | |
605 | } | |
606 | param->data_size = param->data_start + needed; | |
607 | ||
608 | nl->dev = 0; /* Flags no data */ | |
609 | ||
610 | /* | |
611 | * Now loop through filling out the names. | |
612 | */ | |
b82096af | 613 | for (n = rb_first(&name_rb_tree); n; n = rb_next(n)) { |
8b638081 | 614 | void *uuid_ptr; |
b82096af | 615 | hc = container_of(n, struct hash_cell, name_node); |
c909085b MP |
616 | if (!filter_device(hc, param->name, param->uuid)) |
617 | continue; | |
b82096af MP |
618 | if (old_nl) |
619 | old_nl->next = (uint32_t) ((void *) nl - | |
620 | (void *) old_nl); | |
621 | disk = dm_disk(hc->md); | |
622 | nl->dev = huge_encode_dev(disk_devt(disk)); | |
623 | nl->next = 0; | |
624 | strcpy(nl->name, hc->name); | |
625 | ||
626 | old_nl = nl; | |
627 | event_nr = align_ptr(nl->name + strlen(hc->name) + 1); | |
8b638081 MP |
628 | event_nr[0] = dm_get_event_nr(hc->md); |
629 | event_nr[1] = 0; | |
630 | uuid_ptr = align_ptr(event_nr + 2); | |
631 | if (param->flags & DM_UUID_FLAG) { | |
632 | if (hc->uuid) { | |
633 | event_nr[1] |= DM_NAME_LIST_FLAG_HAS_UUID; | |
634 | strcpy(uuid_ptr, hc->uuid); | |
635 | uuid_ptr = align_ptr(uuid_ptr + strlen(hc->uuid) + 1); | |
636 | } else { | |
637 | event_nr[1] |= DM_NAME_LIST_FLAG_DOESNT_HAVE_UUID; | |
638 | } | |
639 | } | |
640 | nl = uuid_ptr; | |
1da177e4 | 641 | } |
62e08243 MP |
642 | /* |
643 | * If mismatch happens, security may be compromised due to buffer | |
644 | * overflow, so it's better to crash. | |
645 | */ | |
646 | BUG_ON((char *)nl - (char *)orig_nl != needed); | |
1da177e4 LT |
647 | |
648 | out: | |
649 | up_write(&_hash_lock); | |
650 | return 0; | |
651 | } | |
652 | ||
653 | static void list_version_get_needed(struct target_type *tt, void *needed_param) | |
654 | { | |
655 | size_t *needed = needed_param; | |
656 | ||
c4cc6635 | 657 | *needed += sizeof(struct dm_target_versions); |
1da177e4 | 658 | *needed += strlen(tt->name); |
1da177e4 LT |
659 | *needed += ALIGN_MASK; |
660 | } | |
661 | ||
662 | static void list_version_get_info(struct target_type *tt, void *param) | |
663 | { | |
664 | struct vers_iter *info = param; | |
665 | ||
666 | /* Check space - it might have changed since the first iteration */ | |
667 | if ((char *)info->vers + sizeof(tt->version) + strlen(tt->name) + 1 > | |
668 | info->end) { | |
669 | ||
670 | info->flags = DM_BUFFER_FULL_FLAG; | |
671 | return; | |
672 | } | |
673 | ||
674 | if (info->old_vers) | |
675 | info->old_vers->next = (uint32_t) ((void *)info->vers - | |
676 | (void *)info->old_vers); | |
677 | info->vers->version[0] = tt->version[0]; | |
678 | info->vers->version[1] = tt->version[1]; | |
679 | info->vers->version[2] = tt->version[2]; | |
680 | info->vers->next = 0; | |
681 | strcpy(info->vers->name, tt->name); | |
682 | ||
683 | info->old_vers = info->vers; | |
684 | info->vers = align_ptr(((void *) ++info->vers) + strlen(tt->name) + 1); | |
685 | } | |
686 | ||
afa179eb | 687 | static int __list_versions(struct dm_ioctl *param, size_t param_size, const char *name) |
1da177e4 LT |
688 | { |
689 | size_t len, needed = 0; | |
690 | struct dm_target_versions *vers; | |
691 | struct vers_iter iter_info; | |
afa179eb MP |
692 | struct target_type *tt = NULL; |
693 | ||
694 | if (name) { | |
695 | tt = dm_get_target_type(name); | |
696 | if (!tt) | |
697 | return -EINVAL; | |
698 | } | |
1da177e4 LT |
699 | |
700 | /* | |
701 | * Loop through all the devices working out how much | |
702 | * space we need. | |
703 | */ | |
afa179eb MP |
704 | if (!tt) |
705 | dm_target_iterate(list_version_get_needed, &needed); | |
706 | else | |
707 | list_version_get_needed(tt, &needed); | |
1da177e4 LT |
708 | |
709 | /* | |
710 | * Grab our output buffer. | |
711 | */ | |
712 | vers = get_result_buffer(param, param_size, &len); | |
713 | if (len < needed) { | |
714 | param->flags |= DM_BUFFER_FULL_FLAG; | |
715 | goto out; | |
716 | } | |
717 | param->data_size = param->data_start + needed; | |
718 | ||
719 | iter_info.param_size = param_size; | |
720 | iter_info.old_vers = NULL; | |
721 | iter_info.vers = vers; | |
722 | iter_info.flags = 0; | |
723 | iter_info.end = (char *)vers+len; | |
724 | ||
725 | /* | |
726 | * Now loop through filling out the names & versions. | |
727 | */ | |
afa179eb MP |
728 | if (!tt) |
729 | dm_target_iterate(list_version_get_info, &iter_info); | |
730 | else | |
731 | list_version_get_info(tt, &iter_info); | |
1da177e4 LT |
732 | param->flags |= iter_info.flags; |
733 | ||
734 | out: | |
afa179eb MP |
735 | if (tt) |
736 | dm_put_target_type(tt); | |
1da177e4 LT |
737 | return 0; |
738 | } | |
739 | ||
afa179eb MP |
740 | static int list_versions(struct file *filp, struct dm_ioctl *param, size_t param_size) |
741 | { | |
742 | return __list_versions(param, param_size, NULL); | |
743 | } | |
744 | ||
745 | static int get_target_version(struct file *filp, struct dm_ioctl *param, size_t param_size) | |
746 | { | |
747 | return __list_versions(param, param_size, param->name); | |
748 | } | |
749 | ||
1da177e4 LT |
750 | static int check_name(const char *name) |
751 | { | |
752 | if (strchr(name, '/')) { | |
753 | DMWARN("invalid device name"); | |
754 | return -EINVAL; | |
755 | } | |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
1d0f3ce8 MS |
760 | /* |
761 | * On successful return, the caller must not attempt to acquire | |
88e2f901 JB |
762 | * _hash_lock without first calling dm_put_live_table, because dm_table_destroy |
763 | * waits for this dm_put_live_table and could be called under this lock. | |
1d0f3ce8 | 764 | */ |
83d5e5b0 | 765 | static struct dm_table *dm_get_inactive_table(struct mapped_device *md, int *srcu_idx) |
1d0f3ce8 MS |
766 | { |
767 | struct hash_cell *hc; | |
768 | struct dm_table *table = NULL; | |
769 | ||
83d5e5b0 MP |
770 | /* increment rcu count, we don't care about the table pointer */ |
771 | dm_get_live_table(md, srcu_idx); | |
772 | ||
1d0f3ce8 MS |
773 | down_read(&_hash_lock); |
774 | hc = dm_get_mdptr(md); | |
775 | if (!hc || hc->md != md) { | |
776 | DMWARN("device has been removed from the dev hash table."); | |
777 | goto out; | |
778 | } | |
779 | ||
780 | table = hc->new_map; | |
1d0f3ce8 MS |
781 | |
782 | out: | |
783 | up_read(&_hash_lock); | |
784 | ||
785 | return table; | |
786 | } | |
787 | ||
788 | static struct dm_table *dm_get_live_or_inactive_table(struct mapped_device *md, | |
83d5e5b0 MP |
789 | struct dm_ioctl *param, |
790 | int *srcu_idx) | |
1d0f3ce8 MS |
791 | { |
792 | return (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) ? | |
83d5e5b0 | 793 | dm_get_inactive_table(md, srcu_idx) : dm_get_live_table(md, srcu_idx); |
1d0f3ce8 MS |
794 | } |
795 | ||
1da177e4 LT |
796 | /* |
797 | * Fills in a dm_ioctl structure, ready for sending back to | |
798 | * userland. | |
799 | */ | |
094ea9a0 | 800 | static void __dev_status(struct mapped_device *md, struct dm_ioctl *param) |
1da177e4 LT |
801 | { |
802 | struct gendisk *disk = dm_disk(md); | |
803 | struct dm_table *table; | |
83d5e5b0 | 804 | int srcu_idx; |
1da177e4 LT |
805 | |
806 | param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG | | |
ffcc3936 | 807 | DM_ACTIVE_PRESENT_FLAG | DM_INTERNAL_SUSPEND_FLAG); |
1da177e4 | 808 | |
4f186f8b | 809 | if (dm_suspended_md(md)) |
1da177e4 LT |
810 | param->flags |= DM_SUSPEND_FLAG; |
811 | ||
ffcc3936 MS |
812 | if (dm_suspended_internally_md(md)) |
813 | param->flags |= DM_INTERNAL_SUSPEND_FLAG; | |
814 | ||
2c140a24 MP |
815 | if (dm_test_deferred_remove_flag(md)) |
816 | param->flags |= DM_DEFERRED_REMOVE; | |
817 | ||
f331c029 | 818 | param->dev = huge_encode_dev(disk_devt(disk)); |
1da177e4 | 819 | |
5c6bd75d AK |
820 | /* |
821 | * Yes, this will be out of date by the time it gets back | |
822 | * to userland, but it is still very useful for | |
823 | * debugging. | |
824 | */ | |
825 | param->open_count = dm_open_count(md); | |
1da177e4 | 826 | |
1da177e4 | 827 | param->event_nr = dm_get_event_nr(md); |
1d0f3ce8 | 828 | param->target_count = 0; |
1da177e4 | 829 | |
83d5e5b0 | 830 | table = dm_get_live_table(md, &srcu_idx); |
1da177e4 | 831 | if (table) { |
1d0f3ce8 MS |
832 | if (!(param->flags & DM_QUERY_INACTIVE_TABLE_FLAG)) { |
833 | if (get_disk_ro(disk)) | |
834 | param->flags |= DM_READONLY_FLAG; | |
2aec377a | 835 | param->target_count = table->num_targets; |
1d0f3ce8 | 836 | } |
1d0f3ce8 MS |
837 | |
838 | param->flags |= DM_ACTIVE_PRESENT_FLAG; | |
839 | } | |
83d5e5b0 | 840 | dm_put_live_table(md, srcu_idx); |
1d0f3ce8 MS |
841 | |
842 | if (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) { | |
83d5e5b0 MP |
843 | int srcu_idx; |
844 | table = dm_get_inactive_table(md, &srcu_idx); | |
1d0f3ce8 MS |
845 | if (table) { |
846 | if (!(dm_table_get_mode(table) & FMODE_WRITE)) | |
847 | param->flags |= DM_READONLY_FLAG; | |
2aec377a | 848 | param->target_count = table->num_targets; |
1d0f3ce8 | 849 | } |
83d5e5b0 | 850 | dm_put_live_table(md, srcu_idx); |
1d0f3ce8 | 851 | } |
1da177e4 LT |
852 | } |
853 | ||
fc1841e1 | 854 | static int dev_create(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 | 855 | { |
2b06cfff | 856 | int r, m = DM_ANY_MINOR; |
1da177e4 LT |
857 | struct mapped_device *md; |
858 | ||
859 | r = check_name(param->name); | |
860 | if (r) | |
861 | return r; | |
862 | ||
863 | if (param->flags & DM_PERSISTENT_DEV_FLAG) | |
2b06cfff | 864 | m = MINOR(huge_decode_dev(param->dev)); |
1da177e4 | 865 | |
2b06cfff | 866 | r = dm_create(m, &md); |
1da177e4 LT |
867 | if (r) |
868 | return r; | |
869 | ||
870 | r = dm_hash_insert(param->name, *param->uuid ? param->uuid : NULL, md); | |
3f77316d KU |
871 | if (r) { |
872 | dm_put(md); | |
873 | dm_destroy(md); | |
874 | return r; | |
875 | } | |
1da177e4 LT |
876 | |
877 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
878 | ||
094ea9a0 AK |
879 | __dev_status(md, param); |
880 | ||
1da177e4 LT |
881 | dm_put(md); |
882 | ||
3f77316d | 883 | return 0; |
1da177e4 LT |
884 | } |
885 | ||
886 | /* | |
887 | * Always use UUID for lookups if it's present, otherwise use name or dev. | |
888 | */ | |
858119e1 | 889 | static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) |
1da177e4 | 890 | { |
0ddf9644 | 891 | struct hash_cell *hc = NULL; |
9ade92a9 | 892 | |
0ddf9644 | 893 | if (*param->uuid) { |
dbdcc906 MP |
894 | if (*param->name || param->dev) { |
895 | DMERR("Invalid ioctl structure: uuid %s, name %s, dev %llx", | |
896 | param->uuid, param->name, (unsigned long long)param->dev); | |
759dea20 | 897 | return NULL; |
dbdcc906 | 898 | } |
759dea20 | 899 | |
0ddf9644 MP |
900 | hc = __get_uuid_cell(param->uuid); |
901 | if (!hc) | |
902 | return NULL; | |
ba2e19b0 | 903 | } else if (*param->name) { |
dbdcc906 MP |
904 | if (param->dev) { |
905 | DMERR("Invalid ioctl structure: name %s, dev %llx", | |
906 | param->name, (unsigned long long)param->dev); | |
759dea20 | 907 | return NULL; |
dbdcc906 | 908 | } |
759dea20 | 909 | |
0ddf9644 MP |
910 | hc = __get_name_cell(param->name); |
911 | if (!hc) | |
912 | return NULL; | |
ba2e19b0 MP |
913 | } else if (param->dev) { |
914 | hc = __get_dev_cell(param->dev); | |
915 | if (!hc) | |
916 | return NULL; | |
917 | } else | |
0ddf9644 | 918 | return NULL; |
9ade92a9 | 919 | |
0ddf9644 MP |
920 | /* |
921 | * Sneakily write in both the name and the uuid | |
922 | * while we have the cell. | |
923 | */ | |
924 | strlcpy(param->name, hc->name, sizeof(param->name)); | |
925 | if (hc->uuid) | |
926 | strlcpy(param->uuid, hc->uuid, sizeof(param->uuid)); | |
927 | else | |
928 | param->uuid[0] = '\0'; | |
929 | ||
930 | if (hc->new_map) | |
931 | param->flags |= DM_INACTIVE_PRESENT_FLAG; | |
932 | else | |
933 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
934 | ||
935 | return hc; | |
1da177e4 LT |
936 | } |
937 | ||
858119e1 | 938 | static struct mapped_device *find_device(struct dm_ioctl *param) |
1da177e4 LT |
939 | { |
940 | struct hash_cell *hc; | |
941 | struct mapped_device *md = NULL; | |
942 | ||
943 | down_read(&_hash_lock); | |
944 | hc = __find_device_hash_cell(param); | |
0ddf9644 | 945 | if (hc) |
1da177e4 | 946 | md = hc->md; |
1da177e4 LT |
947 | up_read(&_hash_lock); |
948 | ||
949 | return md; | |
950 | } | |
951 | ||
fc1841e1 | 952 | static int dev_remove(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 LT |
953 | { |
954 | struct hash_cell *hc; | |
7ec75f25 | 955 | struct mapped_device *md; |
5c6bd75d | 956 | int r; |
83d5e5b0 | 957 | struct dm_table *t; |
1da177e4 LT |
958 | |
959 | down_write(&_hash_lock); | |
960 | hc = __find_device_hash_cell(param); | |
961 | ||
962 | if (!hc) { | |
810b4923 | 963 | DMDEBUG_LIMIT("device doesn't appear to be in the dev hash table."); |
1da177e4 LT |
964 | up_write(&_hash_lock); |
965 | return -ENXIO; | |
966 | } | |
967 | ||
7ec75f25 JM |
968 | md = hc->md; |
969 | ||
5c6bd75d AK |
970 | /* |
971 | * Ensure the device is not open and nothing further can open it. | |
972 | */ | |
2c140a24 | 973 | r = dm_lock_for_deletion(md, !!(param->flags & DM_DEFERRED_REMOVE), false); |
5c6bd75d | 974 | if (r) { |
2c140a24 MP |
975 | if (r == -EBUSY && param->flags & DM_DEFERRED_REMOVE) { |
976 | up_write(&_hash_lock); | |
977 | dm_put(md); | |
978 | return 0; | |
979 | } | |
810b4923 | 980 | DMDEBUG_LIMIT("unable to remove open device %s", hc->name); |
5c6bd75d AK |
981 | up_write(&_hash_lock); |
982 | dm_put(md); | |
983 | return r; | |
984 | } | |
985 | ||
83d5e5b0 | 986 | t = __hash_remove(hc); |
1da177e4 | 987 | up_write(&_hash_lock); |
60935eb2 | 988 | |
83d5e5b0 MP |
989 | if (t) { |
990 | dm_sync_table(md); | |
991 | dm_table_destroy(t); | |
992 | } | |
993 | ||
2c140a24 MP |
994 | param->flags &= ~DM_DEFERRED_REMOVE; |
995 | ||
84010e51 TS |
996 | dm_ima_measure_on_device_remove(md, false); |
997 | ||
3abf85b5 PR |
998 | if (!dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr)) |
999 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
60935eb2 | 1000 | |
7ec75f25 | 1001 | dm_put(md); |
3f77316d | 1002 | dm_destroy(md); |
1da177e4 LT |
1003 | return 0; |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Check a string doesn't overrun the chunk of | |
1008 | * memory we copied from userland. | |
1009 | */ | |
1010 | static int invalid_str(char *str, void *end) | |
1011 | { | |
1012 | while ((void *) str < end) | |
1013 | if (!*str++) | |
1014 | return 0; | |
1015 | ||
1016 | return -EINVAL; | |
1017 | } | |
1018 | ||
fc1841e1 | 1019 | static int dev_rename(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 LT |
1020 | { |
1021 | int r; | |
84c89557 | 1022 | char *new_data = (char *) param + param->data_start; |
856a6f1d | 1023 | struct mapped_device *md; |
84c89557 | 1024 | unsigned change_uuid = (param->flags & DM_UUID_FLAG) ? 1 : 0; |
1da177e4 | 1025 | |
84c89557 | 1026 | if (new_data < param->data || |
c2b04824 | 1027 | invalid_str(new_data, (void *) param + param_size) || !*new_data || |
84c89557 PJ |
1028 | strlen(new_data) > (change_uuid ? DM_UUID_LEN - 1 : DM_NAME_LEN - 1)) { |
1029 | DMWARN("Invalid new mapped device name or uuid string supplied."); | |
1da177e4 LT |
1030 | return -EINVAL; |
1031 | } | |
1032 | ||
84c89557 PJ |
1033 | if (!change_uuid) { |
1034 | r = check_name(new_data); | |
1035 | if (r) | |
1036 | return r; | |
1037 | } | |
1da177e4 | 1038 | |
84c89557 | 1039 | md = dm_hash_rename(param, new_data); |
856a6f1d PR |
1040 | if (IS_ERR(md)) |
1041 | return PTR_ERR(md); | |
3abf85b5 | 1042 | |
856a6f1d PR |
1043 | __dev_status(md, param); |
1044 | dm_put(md); | |
1045 | ||
1046 | return 0; | |
1da177e4 LT |
1047 | } |
1048 | ||
fc1841e1 | 1049 | static int dev_set_geometry(struct file *filp, struct dm_ioctl *param, size_t param_size) |
3ac51e74 DW |
1050 | { |
1051 | int r = -EINVAL, x; | |
1052 | struct mapped_device *md; | |
1053 | struct hd_geometry geometry; | |
1054 | unsigned long indata[4]; | |
1055 | char *geostr = (char *) param + param->data_start; | |
31998ef1 | 1056 | char dummy; |
3ac51e74 DW |
1057 | |
1058 | md = find_device(param); | |
1059 | if (!md) | |
1060 | return -ENXIO; | |
1061 | ||
27238b2b | 1062 | if (geostr < param->data || |
3ac51e74 DW |
1063 | invalid_str(geostr, (void *) param + param_size)) { |
1064 | DMWARN("Invalid geometry supplied."); | |
1065 | goto out; | |
1066 | } | |
1067 | ||
31998ef1 MP |
1068 | x = sscanf(geostr, "%lu %lu %lu %lu%c", indata, |
1069 | indata + 1, indata + 2, indata + 3, &dummy); | |
3ac51e74 DW |
1070 | |
1071 | if (x != 4) { | |
1072 | DMWARN("Unable to interpret geometry settings."); | |
1073 | goto out; | |
1074 | } | |
1075 | ||
1076 | if (indata[0] > 65535 || indata[1] > 255 || | |
1077 | indata[2] > 255 || indata[3] > ULONG_MAX) { | |
1078 | DMWARN("Geometry exceeds range limits."); | |
1079 | goto out; | |
1080 | } | |
1081 | ||
1082 | geometry.cylinders = indata[0]; | |
1083 | geometry.heads = indata[1]; | |
1084 | geometry.sectors = indata[2]; | |
1085 | geometry.start = indata[3]; | |
1086 | ||
1087 | r = dm_set_geometry(md, &geometry); | |
3ac51e74 DW |
1088 | |
1089 | param->data_size = 0; | |
1090 | ||
1091 | out: | |
1092 | dm_put(md); | |
1093 | return r; | |
1094 | } | |
1095 | ||
1da177e4 LT |
1096 | static int do_suspend(struct dm_ioctl *param) |
1097 | { | |
1098 | int r = 0; | |
a3d77d35 | 1099 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
1100 | struct mapped_device *md; |
1101 | ||
1102 | md = find_device(param); | |
1103 | if (!md) | |
1104 | return -ENXIO; | |
1105 | ||
6da487dc | 1106 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 1107 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
1108 | if (param->flags & DM_NOFLUSH_FLAG) |
1109 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
6da487dc | 1110 | |
094ea9a0 | 1111 | if (!dm_suspended_md(md)) { |
a3d77d35 | 1112 | r = dm_suspend(md, suspend_flags); |
094ea9a0 AK |
1113 | if (r) |
1114 | goto out; | |
1115 | } | |
1da177e4 | 1116 | |
094ea9a0 | 1117 | __dev_status(md, param); |
1da177e4 | 1118 | |
094ea9a0 | 1119 | out: |
1da177e4 | 1120 | dm_put(md); |
094ea9a0 | 1121 | |
1da177e4 LT |
1122 | return r; |
1123 | } | |
1124 | ||
1125 | static int do_resume(struct dm_ioctl *param) | |
1126 | { | |
1127 | int r = 0; | |
a3d77d35 | 1128 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
1da177e4 LT |
1129 | struct hash_cell *hc; |
1130 | struct mapped_device *md; | |
042d2a9b | 1131 | struct dm_table *new_map, *old_map = NULL; |
1da177e4 LT |
1132 | |
1133 | down_write(&_hash_lock); | |
1134 | ||
1135 | hc = __find_device_hash_cell(param); | |
1136 | if (!hc) { | |
810b4923 | 1137 | DMDEBUG_LIMIT("device doesn't appear to be in the dev hash table."); |
1da177e4 LT |
1138 | up_write(&_hash_lock); |
1139 | return -ENXIO; | |
1140 | } | |
1141 | ||
1142 | md = hc->md; | |
1da177e4 LT |
1143 | |
1144 | new_map = hc->new_map; | |
1145 | hc->new_map = NULL; | |
1146 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
1147 | ||
1148 | up_write(&_hash_lock); | |
1149 | ||
1150 | /* Do we need to load a new map ? */ | |
1151 | if (new_map) { | |
1152 | /* Suspend if it isn't already suspended */ | |
6da487dc | 1153 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
a3d77d35 | 1154 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
81fdb096 KU |
1155 | if (param->flags & DM_NOFLUSH_FLAG) |
1156 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; | |
4f186f8b | 1157 | if (!dm_suspended_md(md)) |
a3d77d35 | 1158 | dm_suspend(md, suspend_flags); |
1da177e4 | 1159 | |
042d2a9b AK |
1160 | old_map = dm_swap_table(md, new_map); |
1161 | if (IS_ERR(old_map)) { | |
83d5e5b0 | 1162 | dm_sync_table(md); |
d5816876 | 1163 | dm_table_destroy(new_map); |
1da177e4 | 1164 | dm_put(md); |
042d2a9b | 1165 | return PTR_ERR(old_map); |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | if (dm_table_get_mode(new_map) & FMODE_WRITE) | |
1169 | set_disk_ro(dm_disk(md), 0); | |
1170 | else | |
1171 | set_disk_ro(dm_disk(md), 1); | |
1da177e4 LT |
1172 | } |
1173 | ||
0f3649a9 | 1174 | if (dm_suspended_md(md)) { |
1da177e4 | 1175 | r = dm_resume(md); |
8eb6fab4 TS |
1176 | if (!r) { |
1177 | dm_ima_measure_on_device_resume(md, new_map ? true : false); | |
1178 | ||
1179 | if (!dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr)) | |
1180 | param->flags |= DM_UEVENT_GENERATED_FLAG; | |
1181 | } | |
0f3649a9 | 1182 | } |
1da177e4 | 1183 | |
83d5e5b0 MP |
1184 | /* |
1185 | * Since dm_swap_table synchronizes RCU, nobody should be in | |
1186 | * read-side critical section already. | |
1187 | */ | |
042d2a9b AK |
1188 | if (old_map) |
1189 | dm_table_destroy(old_map); | |
60935eb2 | 1190 | |
0f3649a9 | 1191 | if (!r) |
094ea9a0 | 1192 | __dev_status(md, param); |
1da177e4 LT |
1193 | |
1194 | dm_put(md); | |
1195 | return r; | |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * Set or unset the suspension state of a device. | |
1200 | * If the device already is in the requested state we just return its status. | |
1201 | */ | |
fc1841e1 | 1202 | static int dev_suspend(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 LT |
1203 | { |
1204 | if (param->flags & DM_SUSPEND_FLAG) | |
1205 | return do_suspend(param); | |
1206 | ||
1207 | return do_resume(param); | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Copies device info back to user space, used by | |
1212 | * the create and info ioctls. | |
1213 | */ | |
fc1841e1 | 1214 | static int dev_status(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 | 1215 | { |
1da177e4 LT |
1216 | struct mapped_device *md; |
1217 | ||
1218 | md = find_device(param); | |
1219 | if (!md) | |
1220 | return -ENXIO; | |
1221 | ||
094ea9a0 | 1222 | __dev_status(md, param); |
1da177e4 | 1223 | dm_put(md); |
094ea9a0 AK |
1224 | |
1225 | return 0; | |
1da177e4 LT |
1226 | } |
1227 | ||
1228 | /* | |
1229 | * Build up the status struct for each target | |
1230 | */ | |
1231 | static void retrieve_status(struct dm_table *table, | |
1232 | struct dm_ioctl *param, size_t param_size) | |
1233 | { | |
1234 | unsigned int i, num_targets; | |
1235 | struct dm_target_spec *spec; | |
1236 | char *outbuf, *outptr; | |
1237 | status_type_t type; | |
1238 | size_t remaining, len, used = 0; | |
1f4e0ff0 | 1239 | unsigned status_flags = 0; |
1da177e4 LT |
1240 | |
1241 | outptr = outbuf = get_result_buffer(param, param_size, &len); | |
1242 | ||
1243 | if (param->flags & DM_STATUS_TABLE_FLAG) | |
1244 | type = STATUSTYPE_TABLE; | |
91ccbbac TS |
1245 | else if (param->flags & DM_IMA_MEASUREMENT_FLAG) |
1246 | type = STATUSTYPE_IMA; | |
1da177e4 LT |
1247 | else |
1248 | type = STATUSTYPE_INFO; | |
1249 | ||
1250 | /* Get all the target info */ | |
2aec377a | 1251 | num_targets = table->num_targets; |
1da177e4 LT |
1252 | for (i = 0; i < num_targets; i++) { |
1253 | struct dm_target *ti = dm_table_get_target(table, i); | |
fd7c092e | 1254 | size_t l; |
1da177e4 LT |
1255 | |
1256 | remaining = len - (outptr - outbuf); | |
1257 | if (remaining <= sizeof(struct dm_target_spec)) { | |
1258 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1259 | break; | |
1260 | } | |
1261 | ||
1262 | spec = (struct dm_target_spec *) outptr; | |
1263 | ||
1264 | spec->status = 0; | |
1265 | spec->sector_start = ti->begin; | |
1266 | spec->length = ti->len; | |
1267 | strncpy(spec->target_type, ti->type->name, | |
1aeb6e7c | 1268 | sizeof(spec->target_type) - 1); |
1da177e4 LT |
1269 | |
1270 | outptr += sizeof(struct dm_target_spec); | |
1271 | remaining = len - (outptr - outbuf); | |
1272 | if (remaining <= 0) { | |
1273 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1274 | break; | |
1275 | } | |
1276 | ||
1277 | /* Get the status/table string from the target driver */ | |
1278 | if (ti->type->status) { | |
1f4e0ff0 AK |
1279 | if (param->flags & DM_NOFLUSH_FLAG) |
1280 | status_flags |= DM_STATUS_NOFLUSH_FLAG; | |
fd7c092e | 1281 | ti->type->status(ti, type, status_flags, outptr, remaining); |
1da177e4 LT |
1282 | } else |
1283 | outptr[0] = '\0'; | |
1284 | ||
fd7c092e MP |
1285 | l = strlen(outptr) + 1; |
1286 | if (l == remaining) { | |
1287 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1288 | break; | |
1289 | } | |
1290 | ||
1291 | outptr += l; | |
1da177e4 LT |
1292 | used = param->data_start + (outptr - outbuf); |
1293 | ||
1294 | outptr = align_ptr(outptr); | |
1295 | spec->next = outptr - outbuf; | |
1296 | } | |
1297 | ||
1298 | if (used) | |
1299 | param->data_size = used; | |
1300 | ||
1301 | param->target_count = num_targets; | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Wait for a device to report an event | |
1306 | */ | |
fc1841e1 | 1307 | static int dev_wait(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 | 1308 | { |
094ea9a0 | 1309 | int r = 0; |
1da177e4 LT |
1310 | struct mapped_device *md; |
1311 | struct dm_table *table; | |
83d5e5b0 | 1312 | int srcu_idx; |
1da177e4 LT |
1313 | |
1314 | md = find_device(param); | |
1315 | if (!md) | |
1316 | return -ENXIO; | |
1317 | ||
1318 | /* | |
1319 | * Wait for a notification event | |
1320 | */ | |
1321 | if (dm_wait_event(md, param->event_nr)) { | |
1322 | r = -ERESTARTSYS; | |
1323 | goto out; | |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * The userland program is going to want to know what | |
1328 | * changed to trigger the event, so we may as well tell | |
1329 | * him and save an ioctl. | |
1330 | */ | |
094ea9a0 | 1331 | __dev_status(md, param); |
1da177e4 | 1332 | |
83d5e5b0 MP |
1333 | table = dm_get_live_or_inactive_table(md, param, &srcu_idx); |
1334 | if (table) | |
1da177e4 | 1335 | retrieve_status(table, param, param_size); |
83d5e5b0 | 1336 | dm_put_live_table(md, srcu_idx); |
1da177e4 | 1337 | |
094ea9a0 | 1338 | out: |
1da177e4 | 1339 | dm_put(md); |
094ea9a0 | 1340 | |
1da177e4 LT |
1341 | return r; |
1342 | } | |
1343 | ||
fc1841e1 MP |
1344 | /* |
1345 | * Remember the global event number and make it possible to poll | |
1346 | * for further events. | |
1347 | */ | |
1348 | static int dev_arm_poll(struct file *filp, struct dm_ioctl *param, size_t param_size) | |
1349 | { | |
1350 | struct dm_file *priv = filp->private_data; | |
1351 | ||
1352 | priv->global_event_nr = atomic_read(&dm_global_event_nr); | |
1353 | ||
1354 | return 0; | |
1355 | } | |
1356 | ||
aeb5d727 | 1357 | static inline fmode_t get_mode(struct dm_ioctl *param) |
1da177e4 | 1358 | { |
aeb5d727 | 1359 | fmode_t mode = FMODE_READ | FMODE_WRITE; |
1da177e4 LT |
1360 | |
1361 | if (param->flags & DM_READONLY_FLAG) | |
1362 | mode = FMODE_READ; | |
1363 | ||
1364 | return mode; | |
1365 | } | |
1366 | ||
1367 | static int next_target(struct dm_target_spec *last, uint32_t next, void *end, | |
1368 | struct dm_target_spec **spec, char **target_params) | |
1369 | { | |
1370 | *spec = (struct dm_target_spec *) ((unsigned char *) last + next); | |
1371 | *target_params = (char *) (*spec + 1); | |
1372 | ||
1373 | if (*spec < (last + 1)) | |
1374 | return -EINVAL; | |
1375 | ||
1376 | return invalid_str(*target_params, end); | |
1377 | } | |
1378 | ||
1379 | static int populate_table(struct dm_table *table, | |
1380 | struct dm_ioctl *param, size_t param_size) | |
1381 | { | |
1382 | int r; | |
1383 | unsigned int i = 0; | |
1384 | struct dm_target_spec *spec = (struct dm_target_spec *) param; | |
1385 | uint32_t next = param->data_start; | |
1386 | void *end = (void *) param + param_size; | |
1387 | char *target_params; | |
1388 | ||
1389 | if (!param->target_count) { | |
1390 | DMWARN("populate_table: no targets specified"); | |
1391 | return -EINVAL; | |
1392 | } | |
1393 | ||
1394 | for (i = 0; i < param->target_count; i++) { | |
1395 | ||
1396 | r = next_target(spec, next, end, &spec, &target_params); | |
1397 | if (r) { | |
1398 | DMWARN("unable to find target"); | |
1399 | return r; | |
1400 | } | |
1401 | ||
1402 | r = dm_table_add_target(table, spec->target_type, | |
1403 | (sector_t) spec->sector_start, | |
1404 | (sector_t) spec->length, | |
1405 | target_params); | |
1406 | if (r) { | |
1407 | DMWARN("error adding target to table"); | |
1408 | return r; | |
1409 | } | |
1410 | ||
1411 | next = spec->next; | |
1412 | } | |
1413 | ||
1414 | return dm_table_complete(table); | |
1415 | } | |
1416 | ||
7e0d574f | 1417 | static bool is_valid_type(enum dm_queue_mode cur, enum dm_queue_mode new) |
b5ab4a9b TK |
1418 | { |
1419 | if (cur == new || | |
1420 | (cur == DM_TYPE_BIO_BASED && new == DM_TYPE_DAX_BIO_BASED)) | |
1421 | return true; | |
1422 | ||
1423 | return false; | |
1424 | } | |
1425 | ||
fc1841e1 | 1426 | static int table_load(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 LT |
1427 | { |
1428 | int r; | |
1429 | struct hash_cell *hc; | |
83d5e5b0 | 1430 | struct dm_table *t, *old_map = NULL; |
1134e5ae | 1431 | struct mapped_device *md; |
36a0456f | 1432 | struct target_type *immutable_target_type; |
1134e5ae MA |
1433 | |
1434 | md = find_device(param); | |
1435 | if (!md) | |
1436 | return -ENXIO; | |
1da177e4 | 1437 | |
1134e5ae | 1438 | r = dm_table_create(&t, get_mode(param), param->target_count, md); |
1da177e4 | 1439 | if (r) |
f11c1c56 | 1440 | goto err; |
1da177e4 | 1441 | |
00c4fc3b MS |
1442 | /* Protect md->type and md->queue against concurrent table loads. */ |
1443 | dm_lock_md_type(md); | |
1da177e4 | 1444 | r = populate_table(t, param, param_size); |
f11c1c56 MS |
1445 | if (r) |
1446 | goto err_unlock_md_type; | |
1da177e4 | 1447 | |
91ccbbac TS |
1448 | dm_ima_measure_on_table_load(t, STATUSTYPE_IMA); |
1449 | ||
36a0456f AK |
1450 | immutable_target_type = dm_get_immutable_target_type(md); |
1451 | if (immutable_target_type && | |
f083b09b MS |
1452 | (immutable_target_type != dm_table_get_immutable_target_type(t)) && |
1453 | !dm_table_get_wildcard_target(t)) { | |
36a0456f AK |
1454 | DMWARN("can't replace immutable target type %s", |
1455 | immutable_target_type->name); | |
36a0456f | 1456 | r = -EINVAL; |
f11c1c56 | 1457 | goto err_unlock_md_type; |
36a0456f AK |
1458 | } |
1459 | ||
3e6180f0 | 1460 | if (dm_get_md_type(md) == DM_TYPE_NONE) { |
3e6180f0 | 1461 | /* setup md->queue to reflect md's type (may block) */ |
591ddcfc | 1462 | r = dm_setup_md_queue(md, t); |
3e6180f0 CH |
1463 | if (r) { |
1464 | DMWARN("unable to set up device queue for new table."); | |
1465 | goto err_unlock_md_type; | |
1466 | } | |
b5ab4a9b | 1467 | } else if (!is_valid_type(dm_get_md_type(md), dm_table_get_type(t))) { |
b2b04e7e MS |
1468 | DMWARN("can't change device type (old=%u vs new=%u) after initial table load.", |
1469 | dm_get_md_type(md), dm_table_get_type(t)); | |
a5664dad | 1470 | r = -EINVAL; |
f11c1c56 | 1471 | goto err_unlock_md_type; |
a5664dad | 1472 | } |
4a0b4ddf | 1473 | |
a5664dad MS |
1474 | dm_unlock_md_type(md); |
1475 | ||
1476 | /* stage inactive table */ | |
1da177e4 | 1477 | down_write(&_hash_lock); |
1134e5ae MA |
1478 | hc = dm_get_mdptr(md); |
1479 | if (!hc || hc->md != md) { | |
1480 | DMWARN("device has been removed from the dev hash table."); | |
1134e5ae MA |
1481 | up_write(&_hash_lock); |
1482 | r = -ENXIO; | |
f11c1c56 | 1483 | goto err_destroy_table; |
1da177e4 LT |
1484 | } |
1485 | ||
1486 | if (hc->new_map) | |
83d5e5b0 | 1487 | old_map = hc->new_map; |
1da177e4 | 1488 | hc->new_map = t; |
1134e5ae MA |
1489 | up_write(&_hash_lock); |
1490 | ||
1da177e4 | 1491 | param->flags |= DM_INACTIVE_PRESENT_FLAG; |
094ea9a0 | 1492 | __dev_status(md, param); |
1134e5ae | 1493 | |
83d5e5b0 MP |
1494 | if (old_map) { |
1495 | dm_sync_table(md); | |
1496 | dm_table_destroy(old_map); | |
1497 | } | |
1498 | ||
1134e5ae | 1499 | dm_put(md); |
1da177e4 | 1500 | |
f11c1c56 MS |
1501 | return 0; |
1502 | ||
1503 | err_unlock_md_type: | |
1504 | dm_unlock_md_type(md); | |
1505 | err_destroy_table: | |
1506 | dm_table_destroy(t); | |
1507 | err: | |
1508 | dm_put(md); | |
1509 | ||
1da177e4 LT |
1510 | return r; |
1511 | } | |
1512 | ||
fc1841e1 | 1513 | static int table_clear(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 | 1514 | { |
1da177e4 | 1515 | struct hash_cell *hc; |
7ec75f25 | 1516 | struct mapped_device *md; |
83d5e5b0 | 1517 | struct dm_table *old_map = NULL; |
99169b93 | 1518 | bool has_new_map = false; |
1da177e4 LT |
1519 | |
1520 | down_write(&_hash_lock); | |
1521 | ||
1522 | hc = __find_device_hash_cell(param); | |
1523 | if (!hc) { | |
810b4923 | 1524 | DMDEBUG_LIMIT("device doesn't appear to be in the dev hash table."); |
1da177e4 LT |
1525 | up_write(&_hash_lock); |
1526 | return -ENXIO; | |
1527 | } | |
1528 | ||
1529 | if (hc->new_map) { | |
83d5e5b0 | 1530 | old_map = hc->new_map; |
1da177e4 | 1531 | hc->new_map = NULL; |
99169b93 | 1532 | has_new_map = true; |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; | |
1536 | ||
094ea9a0 | 1537 | __dev_status(hc->md, param); |
7ec75f25 | 1538 | md = hc->md; |
1da177e4 | 1539 | up_write(&_hash_lock); |
83d5e5b0 MP |
1540 | if (old_map) { |
1541 | dm_sync_table(md); | |
1542 | dm_table_destroy(old_map); | |
1543 | } | |
99169b93 | 1544 | dm_ima_measure_on_table_clear(md, has_new_map); |
7ec75f25 | 1545 | dm_put(md); |
094ea9a0 AK |
1546 | |
1547 | return 0; | |
1da177e4 LT |
1548 | } |
1549 | ||
1550 | /* | |
1551 | * Retrieves a list of devices used by a particular dm device. | |
1552 | */ | |
1553 | static void retrieve_deps(struct dm_table *table, | |
1554 | struct dm_ioctl *param, size_t param_size) | |
1555 | { | |
1556 | unsigned int count = 0; | |
1557 | struct list_head *tmp; | |
1558 | size_t len, needed; | |
82b1519b | 1559 | struct dm_dev_internal *dd; |
1da177e4 LT |
1560 | struct dm_target_deps *deps; |
1561 | ||
1562 | deps = get_result_buffer(param, param_size, &len); | |
1563 | ||
1564 | /* | |
1565 | * Count the devices. | |
1566 | */ | |
1567 | list_for_each (tmp, dm_table_get_devices(table)) | |
1568 | count++; | |
1569 | ||
1570 | /* | |
1571 | * Check we have enough space. | |
1572 | */ | |
da899625 | 1573 | needed = struct_size(deps, dev, count); |
1da177e4 LT |
1574 | if (len < needed) { |
1575 | param->flags |= DM_BUFFER_FULL_FLAG; | |
1576 | return; | |
1577 | } | |
1578 | ||
1579 | /* | |
1580 | * Fill in the devices. | |
1581 | */ | |
1582 | deps->count = count; | |
1583 | count = 0; | |
1584 | list_for_each_entry (dd, dm_table_get_devices(table), list) | |
86f1152b | 1585 | deps->dev[count++] = huge_encode_dev(dd->dm_dev->bdev->bd_dev); |
1da177e4 LT |
1586 | |
1587 | param->data_size = param->data_start + needed; | |
1588 | } | |
1589 | ||
fc1841e1 | 1590 | static int table_deps(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 | 1591 | { |
1da177e4 LT |
1592 | struct mapped_device *md; |
1593 | struct dm_table *table; | |
83d5e5b0 | 1594 | int srcu_idx; |
1da177e4 LT |
1595 | |
1596 | md = find_device(param); | |
1597 | if (!md) | |
1598 | return -ENXIO; | |
1599 | ||
094ea9a0 | 1600 | __dev_status(md, param); |
1da177e4 | 1601 | |
83d5e5b0 MP |
1602 | table = dm_get_live_or_inactive_table(md, param, &srcu_idx); |
1603 | if (table) | |
1da177e4 | 1604 | retrieve_deps(table, param, param_size); |
83d5e5b0 | 1605 | dm_put_live_table(md, srcu_idx); |
1da177e4 | 1606 | |
1da177e4 | 1607 | dm_put(md); |
094ea9a0 AK |
1608 | |
1609 | return 0; | |
1da177e4 LT |
1610 | } |
1611 | ||
1612 | /* | |
1613 | * Return the status of a device as a text string for each | |
1614 | * target. | |
1615 | */ | |
fc1841e1 | 1616 | static int table_status(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 | 1617 | { |
1da177e4 LT |
1618 | struct mapped_device *md; |
1619 | struct dm_table *table; | |
83d5e5b0 | 1620 | int srcu_idx; |
1da177e4 LT |
1621 | |
1622 | md = find_device(param); | |
1623 | if (!md) | |
1624 | return -ENXIO; | |
1625 | ||
094ea9a0 | 1626 | __dev_status(md, param); |
1da177e4 | 1627 | |
83d5e5b0 MP |
1628 | table = dm_get_live_or_inactive_table(md, param, &srcu_idx); |
1629 | if (table) | |
1da177e4 | 1630 | retrieve_status(table, param, param_size); |
83d5e5b0 | 1631 | dm_put_live_table(md, srcu_idx); |
1da177e4 | 1632 | |
1da177e4 | 1633 | dm_put(md); |
094ea9a0 AK |
1634 | |
1635 | return 0; | |
1da177e4 LT |
1636 | } |
1637 | ||
a2606241 | 1638 | /* |
fd2ed4d2 MP |
1639 | * Process device-mapper dependent messages. Messages prefixed with '@' |
1640 | * are processed by the DM core. All others are delivered to the target. | |
a2606241 MP |
1641 | * Returns a number <= 1 if message was processed by device mapper. |
1642 | * Returns 2 if message should be delivered to the target. | |
1643 | */ | |
1644 | static int message_for_md(struct mapped_device *md, unsigned argc, char **argv, | |
1645 | char *result, unsigned maxlen) | |
1646 | { | |
fd2ed4d2 MP |
1647 | int r; |
1648 | ||
1649 | if (**argv != '@') | |
1650 | return 2; /* no '@' prefix, deliver to target */ | |
1651 | ||
2c140a24 MP |
1652 | if (!strcasecmp(argv[0], "@cancel_deferred_remove")) { |
1653 | if (argc != 1) { | |
1654 | DMERR("Invalid arguments for @cancel_deferred_remove"); | |
1655 | return -EINVAL; | |
1656 | } | |
1657 | return dm_cancel_deferred_remove(md); | |
1658 | } | |
1659 | ||
fd2ed4d2 MP |
1660 | r = dm_stats_message(md, argc, argv, result, maxlen); |
1661 | if (r < 2) | |
1662 | return r; | |
1663 | ||
1664 | DMERR("Unsupported message sent to DM core: %s", argv[0]); | |
1665 | return -EINVAL; | |
a2606241 MP |
1666 | } |
1667 | ||
1da177e4 LT |
1668 | /* |
1669 | * Pass a message to the target that's at the supplied device offset. | |
1670 | */ | |
fc1841e1 | 1671 | static int target_message(struct file *filp, struct dm_ioctl *param, size_t param_size) |
1da177e4 LT |
1672 | { |
1673 | int r, argc; | |
1674 | char **argv; | |
1675 | struct mapped_device *md; | |
1676 | struct dm_table *table; | |
1677 | struct dm_target *ti; | |
1678 | struct dm_target_msg *tmsg = (void *) param + param->data_start; | |
a2606241 MP |
1679 | size_t maxlen; |
1680 | char *result = get_result_buffer(param, param_size, &maxlen); | |
83d5e5b0 | 1681 | int srcu_idx; |
1da177e4 LT |
1682 | |
1683 | md = find_device(param); | |
1684 | if (!md) | |
1685 | return -ENXIO; | |
1686 | ||
027d50f9 | 1687 | if (tmsg < (struct dm_target_msg *) param->data || |
1da177e4 LT |
1688 | invalid_str(tmsg->message, (void *) param + param_size)) { |
1689 | DMWARN("Invalid target message parameters."); | |
1690 | r = -EINVAL; | |
1691 | goto out; | |
1692 | } | |
1693 | ||
1694 | r = dm_split_args(&argc, &argv, tmsg->message); | |
1695 | if (r) { | |
1696 | DMWARN("Failed to split target message parameters"); | |
1697 | goto out; | |
1698 | } | |
1699 | ||
2ca4c92f AK |
1700 | if (!argc) { |
1701 | DMWARN("Empty message received."); | |
4d7659bf | 1702 | r = -EINVAL; |
902c6a96 | 1703 | goto out_argv; |
2ca4c92f AK |
1704 | } |
1705 | ||
a2606241 MP |
1706 | r = message_for_md(md, argc, argv, result, maxlen); |
1707 | if (r <= 1) | |
1708 | goto out_argv; | |
1709 | ||
83d5e5b0 | 1710 | table = dm_get_live_table(md, &srcu_idx); |
1da177e4 | 1711 | if (!table) |
83d5e5b0 | 1712 | goto out_table; |
1da177e4 | 1713 | |
c50abeb3 MA |
1714 | if (dm_deleting_md(md)) { |
1715 | r = -ENXIO; | |
1716 | goto out_table; | |
1717 | } | |
1718 | ||
512875bd | 1719 | ti = dm_table_find_target(table, tmsg->sector); |
123d87d5 | 1720 | if (!ti) { |
1da177e4 LT |
1721 | DMWARN("Target message sector outside device."); |
1722 | r = -EINVAL; | |
512875bd | 1723 | } else if (ti->type->message) |
1eb5fa84 | 1724 | r = ti->type->message(ti, argc, argv, result, maxlen); |
1da177e4 LT |
1725 | else { |
1726 | DMWARN("Target type does not support messages"); | |
1727 | r = -EINVAL; | |
1728 | } | |
1729 | ||
c50abeb3 | 1730 | out_table: |
83d5e5b0 | 1731 | dm_put_live_table(md, srcu_idx); |
1da177e4 LT |
1732 | out_argv: |
1733 | kfree(argv); | |
1734 | out: | |
a2606241 MP |
1735 | if (r >= 0) |
1736 | __dev_status(md, param); | |
1737 | ||
1738 | if (r == 1) { | |
1739 | param->flags |= DM_DATA_OUT_FLAG; | |
fd2ed4d2 | 1740 | if (dm_message_test_buffer_overflow(result, maxlen)) |
a2606241 MP |
1741 | param->flags |= DM_BUFFER_FULL_FLAG; |
1742 | else | |
1743 | param->data_size = param->data_start + strlen(result) + 1; | |
1744 | r = 0; | |
1745 | } | |
1746 | ||
1da177e4 LT |
1747 | dm_put(md); |
1748 | return r; | |
1749 | } | |
1750 | ||
e2914cc2 MP |
1751 | /* |
1752 | * The ioctl parameter block consists of two parts, a dm_ioctl struct | |
1753 | * followed by a data buffer. This flag is set if the second part, | |
1754 | * which has a variable size, is not used by the function processing | |
1755 | * the ioctl. | |
1756 | */ | |
62e08243 MP |
1757 | #define IOCTL_FLAGS_NO_PARAMS 1 |
1758 | #define IOCTL_FLAGS_ISSUE_GLOBAL_EVENT 2 | |
e2914cc2 | 1759 | |
1da177e4 LT |
1760 | /*----------------------------------------------------------------- |
1761 | * Implementation of open/close/ioctl on the special char | |
1762 | * device. | |
1763 | *---------------------------------------------------------------*/ | |
e2914cc2 | 1764 | static ioctl_fn lookup_ioctl(unsigned int cmd, int *ioctl_flags) |
1da177e4 | 1765 | { |
cf0dec66 | 1766 | static const struct { |
1da177e4 | 1767 | int cmd; |
e2914cc2 | 1768 | int flags; |
1da177e4 LT |
1769 | ioctl_fn fn; |
1770 | } _ioctls[] = { | |
e2914cc2 | 1771 | {DM_VERSION_CMD, 0, NULL}, /* version is dealt with elsewhere */ |
62e08243 | 1772 | {DM_REMOVE_ALL_CMD, IOCTL_FLAGS_NO_PARAMS | IOCTL_FLAGS_ISSUE_GLOBAL_EVENT, remove_all}, |
e2914cc2 MP |
1773 | {DM_LIST_DEVICES_CMD, 0, list_devices}, |
1774 | ||
62e08243 MP |
1775 | {DM_DEV_CREATE_CMD, IOCTL_FLAGS_NO_PARAMS | IOCTL_FLAGS_ISSUE_GLOBAL_EVENT, dev_create}, |
1776 | {DM_DEV_REMOVE_CMD, IOCTL_FLAGS_NO_PARAMS | IOCTL_FLAGS_ISSUE_GLOBAL_EVENT, dev_remove}, | |
1777 | {DM_DEV_RENAME_CMD, IOCTL_FLAGS_ISSUE_GLOBAL_EVENT, dev_rename}, | |
e2914cc2 MP |
1778 | {DM_DEV_SUSPEND_CMD, IOCTL_FLAGS_NO_PARAMS, dev_suspend}, |
1779 | {DM_DEV_STATUS_CMD, IOCTL_FLAGS_NO_PARAMS, dev_status}, | |
1780 | {DM_DEV_WAIT_CMD, 0, dev_wait}, | |
1781 | ||
1782 | {DM_TABLE_LOAD_CMD, 0, table_load}, | |
1783 | {DM_TABLE_CLEAR_CMD, IOCTL_FLAGS_NO_PARAMS, table_clear}, | |
1784 | {DM_TABLE_DEPS_CMD, 0, table_deps}, | |
1785 | {DM_TABLE_STATUS_CMD, 0, table_status}, | |
1786 | ||
1787 | {DM_LIST_VERSIONS_CMD, 0, list_versions}, | |
1788 | ||
1789 | {DM_TARGET_MSG_CMD, 0, target_message}, | |
fc1841e1 MP |
1790 | {DM_DEV_SET_GEOMETRY_CMD, 0, dev_set_geometry}, |
1791 | {DM_DEV_ARM_POLL, IOCTL_FLAGS_NO_PARAMS, dev_arm_poll}, | |
afa179eb | 1792 | {DM_GET_TARGET_VERSION, 0, get_target_version}, |
1da177e4 LT |
1793 | }; |
1794 | ||
e2914cc2 MP |
1795 | if (unlikely(cmd >= ARRAY_SIZE(_ioctls))) |
1796 | return NULL; | |
1797 | ||
cd9c88da | 1798 | cmd = array_index_nospec(cmd, ARRAY_SIZE(_ioctls)); |
e2914cc2 MP |
1799 | *ioctl_flags = _ioctls[cmd].flags; |
1800 | return _ioctls[cmd].fn; | |
1da177e4 LT |
1801 | } |
1802 | ||
1803 | /* | |
1804 | * As well as checking the version compatibility this always | |
1805 | * copies the kernel interface version out. | |
1806 | */ | |
1807 | static int check_version(unsigned int cmd, struct dm_ioctl __user *user) | |
1808 | { | |
1809 | uint32_t version[3]; | |
1810 | int r = 0; | |
1811 | ||
1812 | if (copy_from_user(version, user->version, sizeof(version))) | |
1813 | return -EFAULT; | |
1814 | ||
1815 | if ((DM_VERSION_MAJOR != version[0]) || | |
1816 | (DM_VERSION_MINOR < version[1])) { | |
1817 | DMWARN("ioctl interface mismatch: " | |
1818 | "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)", | |
1819 | DM_VERSION_MAJOR, DM_VERSION_MINOR, | |
1820 | DM_VERSION_PATCHLEVEL, | |
1821 | version[0], version[1], version[2], cmd); | |
1822 | r = -EINVAL; | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * Fill in the kernel version. | |
1827 | */ | |
1828 | version[0] = DM_VERSION_MAJOR; | |
1829 | version[1] = DM_VERSION_MINOR; | |
1830 | version[2] = DM_VERSION_PATCHLEVEL; | |
1831 | if (copy_to_user(user->version, version, sizeof(version))) | |
1832 | return -EFAULT; | |
1833 | ||
1834 | return r; | |
1835 | } | |
1836 | ||
028b39e3 | 1837 | #define DM_PARAMS_MALLOC 0x0001 /* Params allocated with kvmalloc() */ |
9c5091f2 MP |
1838 | #define DM_WIPE_BUFFER 0x0010 /* Wipe input buffer before returning from ioctl */ |
1839 | ||
1840 | static void free_params(struct dm_ioctl *param, size_t param_size, int param_flags) | |
1841 | { | |
1842 | if (param_flags & DM_WIPE_BUFFER) | |
1843 | memset(param, 0, param_size); | |
1844 | ||
028b39e3 BVA |
1845 | if (param_flags & DM_PARAMS_MALLOC) |
1846 | kvfree(param); | |
9c5091f2 MP |
1847 | } |
1848 | ||
02cde50b | 1849 | static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kernel, |
800a7340 | 1850 | int ioctl_flags, struct dm_ioctl **param, int *param_flags) |
1da177e4 | 1851 | { |
02cde50b | 1852 | struct dm_ioctl *dmi; |
f8681205 | 1853 | int secure_data; |
6080758d | 1854 | const size_t minimum_data_size = offsetof(struct dm_ioctl, data); |
d224e938 | 1855 | unsigned noio_flag; |
1da177e4 | 1856 | |
02cde50b | 1857 | if (copy_from_user(param_kernel, user, minimum_data_size)) |
1da177e4 LT |
1858 | return -EFAULT; |
1859 | ||
dbdcc906 MP |
1860 | if (param_kernel->data_size < minimum_data_size) { |
1861 | DMERR("Invalid data size in the ioctl structure: %u", | |
1862 | param_kernel->data_size); | |
1da177e4 | 1863 | return -EINVAL; |
dbdcc906 | 1864 | } |
1da177e4 | 1865 | |
02cde50b | 1866 | secure_data = param_kernel->flags & DM_SECURE_DATA_FLAG; |
f8681205 | 1867 | |
9c5091f2 MP |
1868 | *param_flags = secure_data ? DM_WIPE_BUFFER : 0; |
1869 | ||
02cde50b MP |
1870 | if (ioctl_flags & IOCTL_FLAGS_NO_PARAMS) { |
1871 | dmi = param_kernel; | |
1872 | dmi->data_size = minimum_data_size; | |
1873 | goto data_copied; | |
1874 | } | |
1875 | ||
5023e5cf | 1876 | /* |
8c1e2162 JS |
1877 | * Use __GFP_HIGH to avoid low memory issues when a device is |
1878 | * suspended and the ioctl is needed to resume it. | |
9c5091f2 | 1879 | * Use kmalloc() rather than vmalloc() when we can. |
5023e5cf | 1880 | */ |
9c5091f2 | 1881 | dmi = NULL; |
d224e938 | 1882 | noio_flag = memalloc_noio_save(); |
8c1e2162 | 1883 | dmi = kvmalloc(param_kernel->data_size, GFP_KERNEL | __GFP_HIGH); |
d224e938 | 1884 | memalloc_noio_restore(noio_flag); |
9c5091f2 | 1885 | |
f8681205 | 1886 | if (!dmi) { |
02cde50b | 1887 | if (secure_data && clear_user(user, param_kernel->data_size)) |
f8681205 | 1888 | return -EFAULT; |
1da177e4 | 1889 | return -ENOMEM; |
f8681205 | 1890 | } |
1da177e4 | 1891 | |
028b39e3 BVA |
1892 | *param_flags |= DM_PARAMS_MALLOC; |
1893 | ||
800a7340 WW |
1894 | /* Copy from param_kernel (which was already copied from user) */ |
1895 | memcpy(dmi, param_kernel, minimum_data_size); | |
1da177e4 | 1896 | |
800a7340 WW |
1897 | if (copy_from_user(&dmi->data, (char __user *)user + minimum_data_size, |
1898 | param_kernel->data_size - minimum_data_size)) | |
e910d7eb | 1899 | goto bad; |
800a7340 | 1900 | data_copied: |
f8681205 | 1901 | /* Wipe the user buffer so we do not return it to userspace */ |
02cde50b | 1902 | if (secure_data && clear_user(user, param_kernel->data_size)) |
f8681205 MB |
1903 | goto bad; |
1904 | ||
1da177e4 LT |
1905 | *param = dmi; |
1906 | return 0; | |
6bb43b5d MB |
1907 | |
1908 | bad: | |
02cde50b | 1909 | free_params(dmi, param_kernel->data_size, *param_flags); |
9c5091f2 | 1910 | |
6bb43b5d | 1911 | return -EFAULT; |
1da177e4 LT |
1912 | } |
1913 | ||
1914 | static int validate_params(uint cmd, struct dm_ioctl *param) | |
1915 | { | |
1916 | /* Always clear this flag */ | |
1917 | param->flags &= ~DM_BUFFER_FULL_FLAG; | |
3abf85b5 | 1918 | param->flags &= ~DM_UEVENT_GENERATED_FLAG; |
f8681205 | 1919 | param->flags &= ~DM_SECURE_DATA_FLAG; |
a2606241 | 1920 | param->flags &= ~DM_DATA_OUT_FLAG; |
1da177e4 LT |
1921 | |
1922 | /* Ignores parameters */ | |
1923 | if (cmd == DM_REMOVE_ALL_CMD || | |
1924 | cmd == DM_LIST_DEVICES_CMD || | |
1925 | cmd == DM_LIST_VERSIONS_CMD) | |
1926 | return 0; | |
1927 | ||
e36215d8 | 1928 | if (cmd == DM_DEV_CREATE_CMD) { |
1da177e4 LT |
1929 | if (!*param->name) { |
1930 | DMWARN("name not supplied when creating device"); | |
1931 | return -EINVAL; | |
1932 | } | |
e36215d8 | 1933 | } else if (*param->uuid && *param->name) { |
1da177e4 LT |
1934 | DMWARN("only supply one of name or uuid, cmd(%u)", cmd); |
1935 | return -EINVAL; | |
1936 | } | |
1937 | ||
1938 | /* Ensure strings are terminated */ | |
1939 | param->name[DM_NAME_LEN - 1] = '\0'; | |
1940 | param->uuid[DM_UUID_LEN - 1] = '\0'; | |
1941 | ||
1942 | return 0; | |
1943 | } | |
1944 | ||
fc1841e1 | 1945 | static int ctl_ioctl(struct file *file, uint command, struct dm_ioctl __user *user) |
1da177e4 LT |
1946 | { |
1947 | int r = 0; | |
e2914cc2 | 1948 | int ioctl_flags; |
9c5091f2 | 1949 | int param_flags; |
1da177e4 | 1950 | unsigned int cmd; |
3f649ab7 | 1951 | struct dm_ioctl *param; |
1da177e4 | 1952 | ioctl_fn fn = NULL; |
6bb43b5d | 1953 | size_t input_param_size; |
02cde50b | 1954 | struct dm_ioctl param_kernel; |
1da177e4 LT |
1955 | |
1956 | /* only root can play with this */ | |
1957 | if (!capable(CAP_SYS_ADMIN)) | |
1958 | return -EACCES; | |
1959 | ||
1960 | if (_IOC_TYPE(command) != DM_IOCTL) | |
1961 | return -ENOTTY; | |
1962 | ||
1963 | cmd = _IOC_NR(command); | |
1964 | ||
1965 | /* | |
1966 | * Check the interface version passed in. This also | |
1967 | * writes out the kernel's interface version. | |
1968 | */ | |
1969 | r = check_version(cmd, user); | |
1970 | if (r) | |
1971 | return r; | |
1972 | ||
1973 | /* | |
1974 | * Nothing more to do for the version command. | |
1975 | */ | |
1976 | if (cmd == DM_VERSION_CMD) | |
1977 | return 0; | |
1978 | ||
e2914cc2 | 1979 | fn = lookup_ioctl(cmd, &ioctl_flags); |
1da177e4 LT |
1980 | if (!fn) { |
1981 | DMWARN("dm_ctl_ioctl: unknown command 0x%x", command); | |
1982 | return -ENOTTY; | |
1983 | } | |
1984 | ||
1da177e4 LT |
1985 | /* |
1986 | * Copy the parameters into kernel space. | |
1987 | */ | |
02cde50b | 1988 | r = copy_params(user, ¶m_kernel, ioctl_flags, ¶m, ¶m_flags); |
1da177e4 | 1989 | |
dab6a429 AK |
1990 | if (r) |
1991 | return r; | |
1da177e4 | 1992 | |
f8681205 | 1993 | input_param_size = param->data_size; |
1da177e4 LT |
1994 | r = validate_params(cmd, param); |
1995 | if (r) | |
1996 | goto out; | |
1997 | ||
4617f564 | 1998 | param->data_size = offsetof(struct dm_ioctl, data); |
fc1841e1 | 1999 | r = fn(file, param, input_param_size); |
1da177e4 | 2000 | |
e2914cc2 MP |
2001 | if (unlikely(param->flags & DM_BUFFER_FULL_FLAG) && |
2002 | unlikely(ioctl_flags & IOCTL_FLAGS_NO_PARAMS)) | |
2003 | DMERR("ioctl %d tried to output some data but has IOCTL_FLAGS_NO_PARAMS set", cmd); | |
2004 | ||
62e08243 MP |
2005 | if (!r && ioctl_flags & IOCTL_FLAGS_ISSUE_GLOBAL_EVENT) |
2006 | dm_issue_global_event(); | |
2007 | ||
1da177e4 LT |
2008 | /* |
2009 | * Copy the results back to userland. | |
2010 | */ | |
2011 | if (!r && copy_to_user(user, param, param->data_size)) | |
2012 | r = -EFAULT; | |
2013 | ||
6bb43b5d | 2014 | out: |
9c5091f2 | 2015 | free_params(param, input_param_size, param_flags); |
1da177e4 LT |
2016 | return r; |
2017 | } | |
2018 | ||
27238b2b AK |
2019 | static long dm_ctl_ioctl(struct file *file, uint command, ulong u) |
2020 | { | |
fc1841e1 | 2021 | return (long)ctl_ioctl(file, command, (struct dm_ioctl __user *)u); |
27238b2b AK |
2022 | } |
2023 | ||
76c072b4 MB |
2024 | #ifdef CONFIG_COMPAT |
2025 | static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u) | |
2026 | { | |
2027 | return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u)); | |
2028 | } | |
2029 | #else | |
2030 | #define dm_compat_ctl_ioctl NULL | |
2031 | #endif | |
2032 | ||
93e6442c MP |
2033 | static int dm_open(struct inode *inode, struct file *filp) |
2034 | { | |
2035 | int r; | |
2036 | struct dm_file *priv; | |
2037 | ||
2038 | r = nonseekable_open(inode, filp); | |
2039 | if (unlikely(r)) | |
2040 | return r; | |
2041 | ||
2042 | priv = filp->private_data = kmalloc(sizeof(struct dm_file), GFP_KERNEL); | |
2043 | if (!priv) | |
2044 | return -ENOMEM; | |
2045 | ||
2046 | priv->global_event_nr = atomic_read(&dm_global_event_nr); | |
2047 | ||
2048 | return 0; | |
2049 | } | |
2050 | ||
2051 | static int dm_release(struct inode *inode, struct file *filp) | |
2052 | { | |
2053 | kfree(filp->private_data); | |
2054 | return 0; | |
2055 | } | |
2056 | ||
afc9a42b | 2057 | static __poll_t dm_poll(struct file *filp, poll_table *wait) |
93e6442c MP |
2058 | { |
2059 | struct dm_file *priv = filp->private_data; | |
afc9a42b | 2060 | __poll_t mask = 0; |
93e6442c MP |
2061 | |
2062 | poll_wait(filp, &dm_global_eventq, wait); | |
2063 | ||
2064 | if ((int)(atomic_read(&dm_global_event_nr) - priv->global_event_nr) > 0) | |
a9a08845 | 2065 | mask |= EPOLLIN; |
93e6442c MP |
2066 | |
2067 | return mask; | |
2068 | } | |
2069 | ||
fa027c2a | 2070 | static const struct file_operations _ctl_fops = { |
93e6442c MP |
2071 | .open = dm_open, |
2072 | .release = dm_release, | |
2073 | .poll = dm_poll, | |
27238b2b | 2074 | .unlocked_ioctl = dm_ctl_ioctl, |
76c072b4 | 2075 | .compat_ioctl = dm_compat_ctl_ioctl, |
1da177e4 | 2076 | .owner = THIS_MODULE, |
6038f373 | 2077 | .llseek = noop_llseek, |
1da177e4 LT |
2078 | }; |
2079 | ||
2080 | static struct miscdevice _dm_misc = { | |
7e507eb6 | 2081 | .minor = MAPPER_CTRL_MINOR, |
1da177e4 | 2082 | .name = DM_NAME, |
7e507eb6 | 2083 | .nodename = DM_DIR "/" DM_CONTROL_NODE, |
1da177e4 LT |
2084 | .fops = &_ctl_fops |
2085 | }; | |
2086 | ||
7e507eb6 PR |
2087 | MODULE_ALIAS_MISCDEV(MAPPER_CTRL_MINOR); |
2088 | MODULE_ALIAS("devname:" DM_DIR "/" DM_CONTROL_NODE); | |
2089 | ||
1da177e4 LT |
2090 | /* |
2091 | * Create misc character device and link to DM_DIR/control. | |
2092 | */ | |
2093 | int __init dm_interface_init(void) | |
2094 | { | |
2095 | int r; | |
2096 | ||
1da177e4 LT |
2097 | r = misc_register(&_dm_misc); |
2098 | if (r) { | |
2099 | DMERR("misc_register failed for control device"); | |
1da177e4 LT |
2100 | return r; |
2101 | } | |
2102 | ||
2103 | DMINFO("%d.%d.%d%s initialised: %s", DM_VERSION_MAJOR, | |
2104 | DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, DM_VERSION_EXTRA, | |
2105 | DM_DRIVER_EMAIL); | |
2106 | return 0; | |
2107 | } | |
2108 | ||
2109 | void dm_interface_exit(void) | |
2110 | { | |
f368ed60 | 2111 | misc_deregister(&_dm_misc); |
1da177e4 LT |
2112 | dm_hash_exit(); |
2113 | } | |
96a1f7db MA |
2114 | |
2115 | /** | |
2116 | * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers | |
2117 | * @md: Pointer to mapped_device | |
2118 | * @name: Buffer (size DM_NAME_LEN) for name | |
2119 | * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined | |
2120 | */ | |
2121 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) | |
2122 | { | |
2123 | int r = 0; | |
2124 | struct hash_cell *hc; | |
2125 | ||
2126 | if (!md) | |
2127 | return -ENXIO; | |
2128 | ||
6076905b | 2129 | mutex_lock(&dm_hash_cells_mutex); |
96a1f7db MA |
2130 | hc = dm_get_mdptr(md); |
2131 | if (!hc || hc->md != md) { | |
2132 | r = -ENXIO; | |
2133 | goto out; | |
2134 | } | |
2135 | ||
23d39f63 MB |
2136 | if (name) |
2137 | strcpy(name, hc->name); | |
2138 | if (uuid) | |
2139 | strcpy(uuid, hc->uuid ? : ""); | |
96a1f7db MA |
2140 | |
2141 | out: | |
6076905b | 2142 | mutex_unlock(&dm_hash_cells_mutex); |
96a1f7db MA |
2143 | |
2144 | return r; | |
2145 | } | |
61931c0e | 2146 | EXPORT_SYMBOL_GPL(dm_copy_name_and_uuid); |
6bbc923d HK |
2147 | |
2148 | /** | |
2149 | * dm_early_create - create a mapped device in early boot. | |
2150 | * | |
2151 | * @dmi: Contains main information of the device mapping to be created. | |
2152 | * @spec_array: array of pointers to struct dm_target_spec. Describes the | |
2153 | * mapping table of the device. | |
2154 | * @target_params_array: array of strings with the parameters to a specific | |
2155 | * target. | |
2156 | * | |
2157 | * Instead of having the struct dm_target_spec and the parameters for every | |
2158 | * target embedded at the end of struct dm_ioctl (as performed in a normal | |
2159 | * ioctl), pass them as arguments, so the caller doesn't need to serialize them. | |
2160 | * The size of the spec_array and target_params_array is given by | |
2161 | * @dmi->target_count. | |
2162 | * This function is supposed to be called in early boot, so locking mechanisms | |
2163 | * to protect against concurrent loads are not required. | |
2164 | */ | |
2165 | int __init dm_early_create(struct dm_ioctl *dmi, | |
2166 | struct dm_target_spec **spec_array, | |
2167 | char **target_params_array) | |
2168 | { | |
2169 | int r, m = DM_ANY_MINOR; | |
2170 | struct dm_table *t, *old_map; | |
2171 | struct mapped_device *md; | |
2172 | unsigned int i; | |
2173 | ||
2174 | if (!dmi->target_count) | |
2175 | return -EINVAL; | |
2176 | ||
2177 | r = check_name(dmi->name); | |
2178 | if (r) | |
2179 | return r; | |
2180 | ||
2181 | if (dmi->flags & DM_PERSISTENT_DEV_FLAG) | |
2182 | m = MINOR(huge_decode_dev(dmi->dev)); | |
2183 | ||
2184 | /* alloc dm device */ | |
2185 | r = dm_create(m, &md); | |
2186 | if (r) | |
2187 | return r; | |
2188 | ||
2189 | /* hash insert */ | |
2190 | r = dm_hash_insert(dmi->name, *dmi->uuid ? dmi->uuid : NULL, md); | |
2191 | if (r) | |
2192 | goto err_destroy_dm; | |
2193 | ||
2194 | /* alloc table */ | |
2195 | r = dm_table_create(&t, get_mode(dmi), dmi->target_count, md); | |
2196 | if (r) | |
0f41fcf7 | 2197 | goto err_hash_remove; |
6bbc923d HK |
2198 | |
2199 | /* add targets */ | |
2200 | for (i = 0; i < dmi->target_count; i++) { | |
2201 | r = dm_table_add_target(t, spec_array[i]->target_type, | |
2202 | (sector_t) spec_array[i]->sector_start, | |
2203 | (sector_t) spec_array[i]->length, | |
2204 | target_params_array[i]); | |
2205 | if (r) { | |
2206 | DMWARN("error adding target to table"); | |
2207 | goto err_destroy_table; | |
2208 | } | |
2209 | } | |
2210 | ||
2211 | /* finish table */ | |
2212 | r = dm_table_complete(t); | |
2213 | if (r) | |
2214 | goto err_destroy_table; | |
2215 | ||
6bbc923d HK |
2216 | /* setup md->queue to reflect md's type (may block) */ |
2217 | r = dm_setup_md_queue(md, t); | |
2218 | if (r) { | |
2219 | DMWARN("unable to set up device queue for new table."); | |
2220 | goto err_destroy_table; | |
2221 | } | |
2222 | ||
2223 | /* Set new map */ | |
2224 | dm_suspend(md, 0); | |
2225 | old_map = dm_swap_table(md, t); | |
2226 | if (IS_ERR(old_map)) { | |
2227 | r = PTR_ERR(old_map); | |
2228 | goto err_destroy_table; | |
2229 | } | |
2230 | set_disk_ro(dm_disk(md), !!(dmi->flags & DM_READONLY_FLAG)); | |
2231 | ||
2232 | /* resume device */ | |
2233 | r = dm_resume(md); | |
2234 | if (r) | |
2235 | goto err_destroy_table; | |
2236 | ||
2237 | DMINFO("%s (%s) is ready", md->disk->disk_name, dmi->name); | |
2238 | dm_put(md); | |
2239 | return 0; | |
2240 | ||
2241 | err_destroy_table: | |
2242 | dm_table_destroy(t); | |
0f41fcf7 HK |
2243 | err_hash_remove: |
2244 | (void) __hash_remove(__get_name_cell(dmi->name)); | |
2245 | /* release reference from __get_name_cell */ | |
2246 | dm_put(md); | |
6bbc923d HK |
2247 | err_destroy_dm: |
2248 | dm_put(md); | |
2249 | dm_destroy(md); | |
2250 | return r; | |
2251 | } |