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