Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 3 | * Copyright (C) 2004 - 2006 Red Hat, Inc. All rights reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * This file is released under the GPL. |
| 6 | */ |
| 7 | |
| 8 | #include "dm.h" |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/vmalloc.h> |
| 12 | #include <linux/miscdevice.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/wait.h> |
| 15 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/dm-ioctl.h> |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 17 | #include <linux/hdreg.h> |
Milan Broz | 76c072b | 2008-02-08 02:09:56 +0000 | [diff] [blame] | 18 | #include <linux/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | #include <asm/uaccess.h> |
| 21 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 22 | #define DM_MSG_PREFIX "ioctl" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #define DM_DRIVER_EMAIL "dm-devel@redhat.com" |
| 24 | |
| 25 | /*----------------------------------------------------------------- |
| 26 | * The ioctl interface needs to be able to look up devices by |
| 27 | * name or uuid. |
| 28 | *---------------------------------------------------------------*/ |
| 29 | struct hash_cell { |
| 30 | struct list_head name_list; |
| 31 | struct list_head uuid_list; |
| 32 | |
| 33 | char *name; |
| 34 | char *uuid; |
| 35 | struct mapped_device *md; |
| 36 | struct dm_table *new_map; |
| 37 | }; |
| 38 | |
| 39 | struct vers_iter { |
| 40 | size_t param_size; |
| 41 | struct dm_target_versions *vers, *old_vers; |
| 42 | char *end; |
| 43 | uint32_t flags; |
| 44 | }; |
| 45 | |
| 46 | |
| 47 | #define NUM_BUCKETS 64 |
| 48 | #define MASK_BUCKETS (NUM_BUCKETS - 1) |
| 49 | static struct list_head _name_buckets[NUM_BUCKETS]; |
| 50 | static struct list_head _uuid_buckets[NUM_BUCKETS]; |
| 51 | |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 52 | static void dm_hash_remove_all(int keep_open_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | /* |
| 55 | * Guards access to both hash tables. |
| 56 | */ |
| 57 | static DECLARE_RWSEM(_hash_lock); |
| 58 | |
| 59 | static void init_buckets(struct list_head *buckets) |
| 60 | { |
| 61 | unsigned int i; |
| 62 | |
| 63 | for (i = 0; i < NUM_BUCKETS; i++) |
| 64 | INIT_LIST_HEAD(buckets + i); |
| 65 | } |
| 66 | |
| 67 | static int dm_hash_init(void) |
| 68 | { |
| 69 | init_buckets(_name_buckets); |
| 70 | init_buckets(_uuid_buckets); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static void dm_hash_exit(void) |
| 75 | { |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 76 | dm_hash_remove_all(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | /*----------------------------------------------------------------- |
| 80 | * Hash function: |
| 81 | * We're not really concerned with the str hash function being |
| 82 | * fast since it's only used by the ioctl interface. |
| 83 | *---------------------------------------------------------------*/ |
| 84 | static unsigned int hash_str(const char *str) |
| 85 | { |
| 86 | const unsigned int hash_mult = 2654435387U; |
| 87 | unsigned int h = 0; |
| 88 | |
| 89 | while (*str) |
| 90 | h = (h + (unsigned int) *str++) * hash_mult; |
| 91 | |
| 92 | return h & MASK_BUCKETS; |
| 93 | } |
| 94 | |
| 95 | /*----------------------------------------------------------------- |
| 96 | * Code for looking up a device by name |
| 97 | *---------------------------------------------------------------*/ |
| 98 | static struct hash_cell *__get_name_cell(const char *str) |
| 99 | { |
| 100 | struct hash_cell *hc; |
| 101 | unsigned int h = hash_str(str); |
| 102 | |
| 103 | list_for_each_entry (hc, _name_buckets + h, name_list) |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 104 | if (!strcmp(hc->name, str)) { |
| 105 | dm_get(hc->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | return hc; |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 107 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
| 109 | return NULL; |
| 110 | } |
| 111 | |
| 112 | static struct hash_cell *__get_uuid_cell(const char *str) |
| 113 | { |
| 114 | struct hash_cell *hc; |
| 115 | unsigned int h = hash_str(str); |
| 116 | |
| 117 | list_for_each_entry (hc, _uuid_buckets + h, uuid_list) |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 118 | if (!strcmp(hc->uuid, str)) { |
| 119 | dm_get(hc->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | return hc; |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 121 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | return NULL; |
| 124 | } |
| 125 | |
| 126 | /*----------------------------------------------------------------- |
| 127 | * Inserting, removing and renaming a device. |
| 128 | *---------------------------------------------------------------*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | static struct hash_cell *alloc_cell(const char *name, const char *uuid, |
| 130 | struct mapped_device *md) |
| 131 | { |
| 132 | struct hash_cell *hc; |
| 133 | |
| 134 | hc = kmalloc(sizeof(*hc), GFP_KERNEL); |
| 135 | if (!hc) |
| 136 | return NULL; |
| 137 | |
Paulo Marques | 543537b | 2005-06-23 00:09:02 -0700 | [diff] [blame] | 138 | hc->name = kstrdup(name, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | if (!hc->name) { |
| 140 | kfree(hc); |
| 141 | return NULL; |
| 142 | } |
| 143 | |
| 144 | if (!uuid) |
| 145 | hc->uuid = NULL; |
| 146 | |
| 147 | else { |
Paulo Marques | 543537b | 2005-06-23 00:09:02 -0700 | [diff] [blame] | 148 | hc->uuid = kstrdup(uuid, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | if (!hc->uuid) { |
| 150 | kfree(hc->name); |
| 151 | kfree(hc); |
| 152 | return NULL; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | INIT_LIST_HEAD(&hc->name_list); |
| 157 | INIT_LIST_HEAD(&hc->uuid_list); |
| 158 | hc->md = md; |
| 159 | hc->new_map = NULL; |
| 160 | return hc; |
| 161 | } |
| 162 | |
| 163 | static void free_cell(struct hash_cell *hc) |
| 164 | { |
| 165 | if (hc) { |
| 166 | kfree(hc->name); |
| 167 | kfree(hc->uuid); |
| 168 | kfree(hc); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | * The kdev_t and uuid of a device can never change once it is |
| 174 | * initially inserted. |
| 175 | */ |
| 176 | static int dm_hash_insert(const char *name, const char *uuid, struct mapped_device *md) |
| 177 | { |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 178 | struct hash_cell *cell, *hc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | /* |
| 181 | * Allocate the new cells. |
| 182 | */ |
| 183 | cell = alloc_cell(name, uuid, md); |
| 184 | if (!cell) |
| 185 | return -ENOMEM; |
| 186 | |
| 187 | /* |
| 188 | * Insert the cell into both hash tables. |
| 189 | */ |
| 190 | down_write(&_hash_lock); |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 191 | hc = __get_name_cell(name); |
| 192 | if (hc) { |
| 193 | dm_put(hc->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | goto bad; |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | list_add(&cell->name_list, _name_buckets + hash_str(name)); |
| 198 | |
| 199 | if (uuid) { |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 200 | hc = __get_uuid_cell(uuid); |
| 201 | if (hc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | list_del(&cell->name_list); |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 203 | dm_put(hc->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | goto bad; |
| 205 | } |
| 206 | list_add(&cell->uuid_list, _uuid_buckets + hash_str(uuid)); |
| 207 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | dm_get(md); |
| 209 | dm_set_mdptr(md, cell); |
| 210 | up_write(&_hash_lock); |
| 211 | |
| 212 | return 0; |
| 213 | |
| 214 | bad: |
| 215 | up_write(&_hash_lock); |
| 216 | free_cell(cell); |
| 217 | return -EBUSY; |
| 218 | } |
| 219 | |
| 220 | static void __hash_remove(struct hash_cell *hc) |
| 221 | { |
goggin, edward | 269fd2a | 2005-09-27 21:45:44 -0700 | [diff] [blame] | 222 | struct dm_table *table; |
| 223 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | /* remove from the dev hash */ |
| 225 | list_del(&hc->uuid_list); |
| 226 | list_del(&hc->name_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | dm_set_mdptr(hc->md, NULL); |
goggin, edward | 269fd2a | 2005-09-27 21:45:44 -0700 | [diff] [blame] | 228 | |
| 229 | table = dm_get_table(hc->md); |
| 230 | if (table) { |
| 231 | dm_table_event(table); |
| 232 | dm_table_put(table); |
| 233 | } |
| 234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | if (hc->new_map) |
Mikulas Patocka | d581687 | 2009-01-06 03:05:10 +0000 | [diff] [blame] | 236 | dm_table_destroy(hc->new_map); |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 237 | dm_put(hc->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | free_cell(hc); |
| 239 | } |
| 240 | |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 241 | static void dm_hash_remove_all(int keep_open_devices) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | { |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 243 | int i, dev_skipped, dev_removed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | struct hash_cell *hc; |
| 245 | struct list_head *tmp, *n; |
| 246 | |
| 247 | down_write(&_hash_lock); |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 248 | |
| 249 | retry: |
| 250 | dev_skipped = dev_removed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | for (i = 0; i < NUM_BUCKETS; i++) { |
| 252 | list_for_each_safe (tmp, n, _name_buckets + i) { |
| 253 | hc = list_entry(tmp, struct hash_cell, name_list); |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 254 | |
| 255 | if (keep_open_devices && |
| 256 | dm_lock_for_deletion(hc->md)) { |
| 257 | dev_skipped++; |
| 258 | continue; |
| 259 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | __hash_remove(hc); |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 261 | dev_removed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | } |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 264 | |
| 265 | /* |
| 266 | * Some mapped devices may be using other mapped devices, so if any |
| 267 | * still exist, repeat until we make no further progress. |
| 268 | */ |
| 269 | if (dev_skipped) { |
| 270 | if (dev_removed) |
| 271 | goto retry; |
| 272 | |
| 273 | DMWARN("remove_all left %d open device(s)", dev_skipped); |
| 274 | } |
| 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | up_write(&_hash_lock); |
| 277 | } |
| 278 | |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 279 | static int dm_hash_rename(uint32_t cookie, const char *old, const char *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
| 281 | char *new_name, *old_name; |
| 282 | struct hash_cell *hc; |
goggin, edward | 81f1777 | 2006-01-06 00:20:01 -0800 | [diff] [blame] | 283 | struct dm_table *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | /* |
| 286 | * duplicate new. |
| 287 | */ |
Paulo Marques | 543537b | 2005-06-23 00:09:02 -0700 | [diff] [blame] | 288 | new_name = kstrdup(new, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | if (!new_name) |
| 290 | return -ENOMEM; |
| 291 | |
| 292 | down_write(&_hash_lock); |
| 293 | |
| 294 | /* |
| 295 | * Is new free ? |
| 296 | */ |
| 297 | hc = __get_name_cell(new); |
| 298 | if (hc) { |
| 299 | DMWARN("asked to rename to an already existing name %s -> %s", |
| 300 | old, new); |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 301 | dm_put(hc->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | up_write(&_hash_lock); |
| 303 | kfree(new_name); |
| 304 | return -EBUSY; |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * Is there such a device as 'old' ? |
| 309 | */ |
| 310 | hc = __get_name_cell(old); |
| 311 | if (!hc) { |
| 312 | DMWARN("asked to rename a non existent device %s -> %s", |
| 313 | old, new); |
| 314 | up_write(&_hash_lock); |
| 315 | kfree(new_name); |
| 316 | return -ENXIO; |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * rename and move the name cell. |
| 321 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | list_del(&hc->name_list); |
| 323 | old_name = hc->name; |
| 324 | hc->name = new_name; |
| 325 | list_add(&hc->name_list, _name_buckets + hash_str(new_name)); |
| 326 | |
goggin, edward | 81f1777 | 2006-01-06 00:20:01 -0800 | [diff] [blame] | 327 | /* |
| 328 | * Wake up any dm event waiters. |
| 329 | */ |
| 330 | table = dm_get_table(hc->md); |
| 331 | if (table) { |
| 332 | dm_table_event(table); |
| 333 | dm_table_put(table); |
| 334 | } |
| 335 | |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 336 | dm_kobject_uevent(hc->md, KOBJ_CHANGE, cookie); |
Alasdair G Kergon | 69267a3 | 2007-12-13 14:15:57 +0000 | [diff] [blame] | 337 | |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 338 | dm_put(hc->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | up_write(&_hash_lock); |
| 340 | kfree(old_name); |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | /*----------------------------------------------------------------- |
| 345 | * Implementation of the ioctl commands |
| 346 | *---------------------------------------------------------------*/ |
| 347 | /* |
| 348 | * All the ioctl commands get dispatched to functions with this |
| 349 | * prototype. |
| 350 | */ |
| 351 | typedef int (*ioctl_fn)(struct dm_ioctl *param, size_t param_size); |
| 352 | |
| 353 | static int remove_all(struct dm_ioctl *param, size_t param_size) |
| 354 | { |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 355 | dm_hash_remove_all(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | param->data_size = 0; |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * Round up the ptr to an 8-byte boundary. |
| 362 | */ |
| 363 | #define ALIGN_MASK 7 |
| 364 | static inline void *align_ptr(void *ptr) |
| 365 | { |
| 366 | return (void *) (((size_t) (ptr + ALIGN_MASK)) & ~ALIGN_MASK); |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Retrieves the data payload buffer from an already allocated |
| 371 | * struct dm_ioctl. |
| 372 | */ |
| 373 | static void *get_result_buffer(struct dm_ioctl *param, size_t param_size, |
| 374 | size_t *len) |
| 375 | { |
| 376 | param->data_start = align_ptr(param + 1) - (void *) param; |
| 377 | |
| 378 | if (param->data_start < param_size) |
| 379 | *len = param_size - param->data_start; |
| 380 | else |
| 381 | *len = 0; |
| 382 | |
| 383 | return ((void *) param) + param->data_start; |
| 384 | } |
| 385 | |
| 386 | static int list_devices(struct dm_ioctl *param, size_t param_size) |
| 387 | { |
| 388 | unsigned int i; |
| 389 | struct hash_cell *hc; |
| 390 | size_t len, needed = 0; |
| 391 | struct gendisk *disk; |
| 392 | struct dm_name_list *nl, *old_nl = NULL; |
| 393 | |
| 394 | down_write(&_hash_lock); |
| 395 | |
| 396 | /* |
| 397 | * Loop through all the devices working out how much |
| 398 | * space we need. |
| 399 | */ |
| 400 | for (i = 0; i < NUM_BUCKETS; i++) { |
| 401 | list_for_each_entry (hc, _name_buckets + i, name_list) { |
| 402 | needed += sizeof(struct dm_name_list); |
| 403 | needed += strlen(hc->name) + 1; |
| 404 | needed += ALIGN_MASK; |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Grab our output buffer. |
| 410 | */ |
| 411 | nl = get_result_buffer(param, param_size, &len); |
| 412 | if (len < needed) { |
| 413 | param->flags |= DM_BUFFER_FULL_FLAG; |
| 414 | goto out; |
| 415 | } |
| 416 | param->data_size = param->data_start + needed; |
| 417 | |
| 418 | nl->dev = 0; /* Flags no data */ |
| 419 | |
| 420 | /* |
| 421 | * Now loop through filling out the names. |
| 422 | */ |
| 423 | for (i = 0; i < NUM_BUCKETS; i++) { |
| 424 | list_for_each_entry (hc, _name_buckets + i, name_list) { |
| 425 | if (old_nl) |
| 426 | old_nl->next = (uint32_t) ((void *) nl - |
| 427 | (void *) old_nl); |
| 428 | disk = dm_disk(hc->md); |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 429 | nl->dev = huge_encode_dev(disk_devt(disk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | nl->next = 0; |
| 431 | strcpy(nl->name, hc->name); |
| 432 | |
| 433 | old_nl = nl; |
| 434 | nl = align_ptr(((void *) ++nl) + strlen(hc->name) + 1); |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | out: |
| 439 | up_write(&_hash_lock); |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | static void list_version_get_needed(struct target_type *tt, void *needed_param) |
| 444 | { |
| 445 | size_t *needed = needed_param; |
| 446 | |
Alasdair G Kergon | c4cc663 | 2005-11-21 21:32:33 -0800 | [diff] [blame] | 447 | *needed += sizeof(struct dm_target_versions); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | *needed += strlen(tt->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | *needed += ALIGN_MASK; |
| 450 | } |
| 451 | |
| 452 | static void list_version_get_info(struct target_type *tt, void *param) |
| 453 | { |
| 454 | struct vers_iter *info = param; |
| 455 | |
| 456 | /* Check space - it might have changed since the first iteration */ |
| 457 | if ((char *)info->vers + sizeof(tt->version) + strlen(tt->name) + 1 > |
| 458 | info->end) { |
| 459 | |
| 460 | info->flags = DM_BUFFER_FULL_FLAG; |
| 461 | return; |
| 462 | } |
| 463 | |
| 464 | if (info->old_vers) |
| 465 | info->old_vers->next = (uint32_t) ((void *)info->vers - |
| 466 | (void *)info->old_vers); |
| 467 | info->vers->version[0] = tt->version[0]; |
| 468 | info->vers->version[1] = tt->version[1]; |
| 469 | info->vers->version[2] = tt->version[2]; |
| 470 | info->vers->next = 0; |
| 471 | strcpy(info->vers->name, tt->name); |
| 472 | |
| 473 | info->old_vers = info->vers; |
| 474 | info->vers = align_ptr(((void *) ++info->vers) + strlen(tt->name) + 1); |
| 475 | } |
| 476 | |
| 477 | static int list_versions(struct dm_ioctl *param, size_t param_size) |
| 478 | { |
| 479 | size_t len, needed = 0; |
| 480 | struct dm_target_versions *vers; |
| 481 | struct vers_iter iter_info; |
| 482 | |
| 483 | /* |
| 484 | * Loop through all the devices working out how much |
| 485 | * space we need. |
| 486 | */ |
| 487 | dm_target_iterate(list_version_get_needed, &needed); |
| 488 | |
| 489 | /* |
| 490 | * Grab our output buffer. |
| 491 | */ |
| 492 | vers = get_result_buffer(param, param_size, &len); |
| 493 | if (len < needed) { |
| 494 | param->flags |= DM_BUFFER_FULL_FLAG; |
| 495 | goto out; |
| 496 | } |
| 497 | param->data_size = param->data_start + needed; |
| 498 | |
| 499 | iter_info.param_size = param_size; |
| 500 | iter_info.old_vers = NULL; |
| 501 | iter_info.vers = vers; |
| 502 | iter_info.flags = 0; |
| 503 | iter_info.end = (char *)vers+len; |
| 504 | |
| 505 | /* |
| 506 | * Now loop through filling out the names & versions. |
| 507 | */ |
| 508 | dm_target_iterate(list_version_get_info, &iter_info); |
| 509 | param->flags |= iter_info.flags; |
| 510 | |
| 511 | out: |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | |
| 516 | |
| 517 | static int check_name(const char *name) |
| 518 | { |
| 519 | if (strchr(name, '/')) { |
| 520 | DMWARN("invalid device name"); |
| 521 | return -EINVAL; |
| 522 | } |
| 523 | |
| 524 | return 0; |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * Fills in a dm_ioctl structure, ready for sending back to |
| 529 | * userland. |
| 530 | */ |
| 531 | static int __dev_status(struct mapped_device *md, struct dm_ioctl *param) |
| 532 | { |
| 533 | struct gendisk *disk = dm_disk(md); |
| 534 | struct dm_table *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
| 536 | param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG | |
| 537 | DM_ACTIVE_PRESENT_FLAG); |
| 538 | |
| 539 | if (dm_suspended(md)) |
| 540 | param->flags |= DM_SUSPEND_FLAG; |
| 541 | |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 542 | param->dev = huge_encode_dev(disk_devt(disk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 544 | /* |
| 545 | * Yes, this will be out of date by the time it gets back |
| 546 | * to userland, but it is still very useful for |
| 547 | * debugging. |
| 548 | */ |
| 549 | param->open_count = dm_open_count(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Tejun Heo | b7db995 | 2008-08-25 19:56:10 +0900 | [diff] [blame] | 551 | if (get_disk_ro(disk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | param->flags |= DM_READONLY_FLAG; |
| 553 | |
| 554 | param->event_nr = dm_get_event_nr(md); |
| 555 | |
| 556 | table = dm_get_table(md); |
| 557 | if (table) { |
| 558 | param->flags |= DM_ACTIVE_PRESENT_FLAG; |
| 559 | param->target_count = dm_table_get_num_targets(table); |
| 560 | dm_table_put(table); |
| 561 | } else |
| 562 | param->target_count = 0; |
| 563 | |
| 564 | return 0; |
| 565 | } |
| 566 | |
| 567 | static int dev_create(struct dm_ioctl *param, size_t param_size) |
| 568 | { |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 569 | int r, m = DM_ANY_MINOR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | struct mapped_device *md; |
| 571 | |
| 572 | r = check_name(param->name); |
| 573 | if (r) |
| 574 | return r; |
| 575 | |
| 576 | if (param->flags & DM_PERSISTENT_DEV_FLAG) |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 577 | m = MINOR(huge_decode_dev(param->dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 579 | r = dm_create(m, &md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | if (r) |
| 581 | return r; |
| 582 | |
| 583 | r = dm_hash_insert(param->name, *param->uuid ? param->uuid : NULL, md); |
| 584 | if (r) { |
| 585 | dm_put(md); |
| 586 | return r; |
| 587 | } |
| 588 | |
| 589 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; |
| 590 | |
| 591 | r = __dev_status(md, param); |
| 592 | dm_put(md); |
| 593 | |
| 594 | return r; |
| 595 | } |
| 596 | |
| 597 | /* |
| 598 | * Always use UUID for lookups if it's present, otherwise use name or dev. |
| 599 | */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 600 | static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | { |
Alasdair G Kergon | 9ade92a | 2006-03-27 01:17:53 -0800 | [diff] [blame] | 602 | struct mapped_device *md; |
| 603 | void *mdptr = NULL; |
| 604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | if (*param->uuid) |
| 606 | return __get_uuid_cell(param->uuid); |
Alasdair G Kergon | 9ade92a | 2006-03-27 01:17:53 -0800 | [diff] [blame] | 607 | |
| 608 | if (*param->name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | return __get_name_cell(param->name); |
Alasdair G Kergon | 9ade92a | 2006-03-27 01:17:53 -0800 | [diff] [blame] | 610 | |
| 611 | md = dm_get_md(huge_decode_dev(param->dev)); |
Alasdair G Kergon | bfc5ecd | 2006-11-08 17:44:42 -0800 | [diff] [blame] | 612 | if (!md) |
| 613 | goto out; |
Alasdair G Kergon | 9ade92a | 2006-03-27 01:17:53 -0800 | [diff] [blame] | 614 | |
Alasdair G Kergon | bfc5ecd | 2006-11-08 17:44:42 -0800 | [diff] [blame] | 615 | mdptr = dm_get_mdptr(md); |
| 616 | if (!mdptr) |
| 617 | dm_put(md); |
| 618 | |
| 619 | out: |
Alasdair G Kergon | 9ade92a | 2006-03-27 01:17:53 -0800 | [diff] [blame] | 620 | return mdptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | } |
| 622 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 623 | static struct mapped_device *find_device(struct dm_ioctl *param) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | { |
| 625 | struct hash_cell *hc; |
| 626 | struct mapped_device *md = NULL; |
| 627 | |
| 628 | down_read(&_hash_lock); |
| 629 | hc = __find_device_hash_cell(param); |
| 630 | if (hc) { |
| 631 | md = hc->md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
| 633 | /* |
| 634 | * Sneakily write in both the name and the uuid |
| 635 | * while we have the cell. |
| 636 | */ |
| 637 | strncpy(param->name, hc->name, sizeof(param->name)); |
| 638 | if (hc->uuid) |
| 639 | strncpy(param->uuid, hc->uuid, sizeof(param->uuid)-1); |
| 640 | else |
| 641 | param->uuid[0] = '\0'; |
| 642 | |
| 643 | if (hc->new_map) |
| 644 | param->flags |= DM_INACTIVE_PRESENT_FLAG; |
| 645 | else |
| 646 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; |
| 647 | } |
| 648 | up_read(&_hash_lock); |
| 649 | |
| 650 | return md; |
| 651 | } |
| 652 | |
| 653 | static int dev_remove(struct dm_ioctl *param, size_t param_size) |
| 654 | { |
| 655 | struct hash_cell *hc; |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 656 | struct mapped_device *md; |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 657 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
| 659 | down_write(&_hash_lock); |
| 660 | hc = __find_device_hash_cell(param); |
| 661 | |
| 662 | if (!hc) { |
| 663 | DMWARN("device doesn't appear to be in the dev hash table."); |
| 664 | up_write(&_hash_lock); |
| 665 | return -ENXIO; |
| 666 | } |
| 667 | |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 668 | md = hc->md; |
| 669 | |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 670 | /* |
| 671 | * Ensure the device is not open and nothing further can open it. |
| 672 | */ |
| 673 | r = dm_lock_for_deletion(md); |
| 674 | if (r) { |
| 675 | DMWARN("unable to remove open device %s", hc->name); |
| 676 | up_write(&_hash_lock); |
| 677 | dm_put(md); |
| 678 | return r; |
| 679 | } |
| 680 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | __hash_remove(hc); |
| 682 | up_write(&_hash_lock); |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 683 | |
| 684 | dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr); |
| 685 | |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 686 | dm_put(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | param->data_size = 0; |
| 688 | return 0; |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * Check a string doesn't overrun the chunk of |
| 693 | * memory we copied from userland. |
| 694 | */ |
| 695 | static int invalid_str(char *str, void *end) |
| 696 | { |
| 697 | while ((void *) str < end) |
| 698 | if (!*str++) |
| 699 | return 0; |
| 700 | |
| 701 | return -EINVAL; |
| 702 | } |
| 703 | |
| 704 | static int dev_rename(struct dm_ioctl *param, size_t param_size) |
| 705 | { |
| 706 | int r; |
| 707 | char *new_name = (char *) param + param->data_start; |
| 708 | |
Alasdair G Kergon | 27238b2 | 2008-02-08 02:09:53 +0000 | [diff] [blame] | 709 | if (new_name < param->data || |
Milan Broz | bc0fd67 | 2009-03-16 16:56:01 +0000 | [diff] [blame] | 710 | invalid_str(new_name, (void *) param + param_size) || |
| 711 | strlen(new_name) > DM_NAME_LEN - 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | DMWARN("Invalid new logical volume name supplied."); |
| 713 | return -EINVAL; |
| 714 | } |
| 715 | |
| 716 | r = check_name(new_name); |
| 717 | if (r) |
| 718 | return r; |
| 719 | |
| 720 | param->data_size = 0; |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 721 | return dm_hash_rename(param->event_nr, param->name, new_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | } |
| 723 | |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 724 | static int dev_set_geometry(struct dm_ioctl *param, size_t param_size) |
| 725 | { |
| 726 | int r = -EINVAL, x; |
| 727 | struct mapped_device *md; |
| 728 | struct hd_geometry geometry; |
| 729 | unsigned long indata[4]; |
| 730 | char *geostr = (char *) param + param->data_start; |
| 731 | |
| 732 | md = find_device(param); |
| 733 | if (!md) |
| 734 | return -ENXIO; |
| 735 | |
Alasdair G Kergon | 27238b2 | 2008-02-08 02:09:53 +0000 | [diff] [blame] | 736 | if (geostr < param->data || |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 737 | invalid_str(geostr, (void *) param + param_size)) { |
| 738 | DMWARN("Invalid geometry supplied."); |
| 739 | goto out; |
| 740 | } |
| 741 | |
| 742 | x = sscanf(geostr, "%lu %lu %lu %lu", indata, |
| 743 | indata + 1, indata + 2, indata + 3); |
| 744 | |
| 745 | if (x != 4) { |
| 746 | DMWARN("Unable to interpret geometry settings."); |
| 747 | goto out; |
| 748 | } |
| 749 | |
| 750 | if (indata[0] > 65535 || indata[1] > 255 || |
| 751 | indata[2] > 255 || indata[3] > ULONG_MAX) { |
| 752 | DMWARN("Geometry exceeds range limits."); |
| 753 | goto out; |
| 754 | } |
| 755 | |
| 756 | geometry.cylinders = indata[0]; |
| 757 | geometry.heads = indata[1]; |
| 758 | geometry.sectors = indata[2]; |
| 759 | geometry.start = indata[3]; |
| 760 | |
| 761 | r = dm_set_geometry(md, &geometry); |
| 762 | if (!r) |
| 763 | r = __dev_status(md, param); |
| 764 | |
| 765 | param->data_size = 0; |
| 766 | |
| 767 | out: |
| 768 | dm_put(md); |
| 769 | return r; |
| 770 | } |
| 771 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | static int do_suspend(struct dm_ioctl *param) |
| 773 | { |
| 774 | int r = 0; |
Kiyoshi Ueda | a3d77d3 | 2006-12-08 02:41:04 -0800 | [diff] [blame] | 775 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | struct mapped_device *md; |
| 777 | |
| 778 | md = find_device(param); |
| 779 | if (!md) |
| 780 | return -ENXIO; |
| 781 | |
Alasdair G Kergon | 6da487d | 2006-01-06 00:20:07 -0800 | [diff] [blame] | 782 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
Kiyoshi Ueda | a3d77d3 | 2006-12-08 02:41:04 -0800 | [diff] [blame] | 783 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
Kiyoshi Ueda | 81fdb09 | 2006-12-08 02:41:07 -0800 | [diff] [blame] | 784 | if (param->flags & DM_NOFLUSH_FLAG) |
| 785 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; |
Alasdair G Kergon | 6da487d | 2006-01-06 00:20:07 -0800 | [diff] [blame] | 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | if (!dm_suspended(md)) |
Kiyoshi Ueda | a3d77d3 | 2006-12-08 02:41:04 -0800 | [diff] [blame] | 788 | r = dm_suspend(md, suspend_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
| 790 | if (!r) |
| 791 | r = __dev_status(md, param); |
| 792 | |
| 793 | dm_put(md); |
| 794 | return r; |
| 795 | } |
| 796 | |
| 797 | static int do_resume(struct dm_ioctl *param) |
| 798 | { |
| 799 | int r = 0; |
Kiyoshi Ueda | a3d77d3 | 2006-12-08 02:41:04 -0800 | [diff] [blame] | 800 | unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | struct hash_cell *hc; |
| 802 | struct mapped_device *md; |
| 803 | struct dm_table *new_map; |
| 804 | |
| 805 | down_write(&_hash_lock); |
| 806 | |
| 807 | hc = __find_device_hash_cell(param); |
| 808 | if (!hc) { |
| 809 | DMWARN("device doesn't appear to be in the dev hash table."); |
| 810 | up_write(&_hash_lock); |
| 811 | return -ENXIO; |
| 812 | } |
| 813 | |
| 814 | md = hc->md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
| 816 | new_map = hc->new_map; |
| 817 | hc->new_map = NULL; |
| 818 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; |
| 819 | |
| 820 | up_write(&_hash_lock); |
| 821 | |
| 822 | /* Do we need to load a new map ? */ |
| 823 | if (new_map) { |
| 824 | /* Suspend if it isn't already suspended */ |
Alasdair G Kergon | 6da487d | 2006-01-06 00:20:07 -0800 | [diff] [blame] | 825 | if (param->flags & DM_SKIP_LOCKFS_FLAG) |
Kiyoshi Ueda | a3d77d3 | 2006-12-08 02:41:04 -0800 | [diff] [blame] | 826 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; |
Kiyoshi Ueda | 81fdb09 | 2006-12-08 02:41:07 -0800 | [diff] [blame] | 827 | if (param->flags & DM_NOFLUSH_FLAG) |
| 828 | suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | if (!dm_suspended(md)) |
Kiyoshi Ueda | a3d77d3 | 2006-12-08 02:41:04 -0800 | [diff] [blame] | 830 | dm_suspend(md, suspend_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
| 832 | r = dm_swap_table(md, new_map); |
| 833 | if (r) { |
Mikulas Patocka | d581687 | 2009-01-06 03:05:10 +0000 | [diff] [blame] | 834 | dm_table_destroy(new_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | dm_put(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | return r; |
| 837 | } |
| 838 | |
| 839 | if (dm_table_get_mode(new_map) & FMODE_WRITE) |
| 840 | set_disk_ro(dm_disk(md), 0); |
| 841 | else |
| 842 | set_disk_ro(dm_disk(md), 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | } |
| 844 | |
| 845 | if (dm_suspended(md)) |
| 846 | r = dm_resume(md); |
| 847 | |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 848 | |
| 849 | if (!r) { |
| 850 | dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | r = __dev_status(md, param); |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 852 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
| 854 | dm_put(md); |
| 855 | return r; |
| 856 | } |
| 857 | |
| 858 | /* |
| 859 | * Set or unset the suspension state of a device. |
| 860 | * If the device already is in the requested state we just return its status. |
| 861 | */ |
| 862 | static int dev_suspend(struct dm_ioctl *param, size_t param_size) |
| 863 | { |
| 864 | if (param->flags & DM_SUSPEND_FLAG) |
| 865 | return do_suspend(param); |
| 866 | |
| 867 | return do_resume(param); |
| 868 | } |
| 869 | |
| 870 | /* |
| 871 | * Copies device info back to user space, used by |
| 872 | * the create and info ioctls. |
| 873 | */ |
| 874 | static int dev_status(struct dm_ioctl *param, size_t param_size) |
| 875 | { |
| 876 | int r; |
| 877 | struct mapped_device *md; |
| 878 | |
| 879 | md = find_device(param); |
| 880 | if (!md) |
| 881 | return -ENXIO; |
| 882 | |
| 883 | r = __dev_status(md, param); |
| 884 | dm_put(md); |
| 885 | return r; |
| 886 | } |
| 887 | |
| 888 | /* |
| 889 | * Build up the status struct for each target |
| 890 | */ |
| 891 | static void retrieve_status(struct dm_table *table, |
| 892 | struct dm_ioctl *param, size_t param_size) |
| 893 | { |
| 894 | unsigned int i, num_targets; |
| 895 | struct dm_target_spec *spec; |
| 896 | char *outbuf, *outptr; |
| 897 | status_type_t type; |
| 898 | size_t remaining, len, used = 0; |
| 899 | |
| 900 | outptr = outbuf = get_result_buffer(param, param_size, &len); |
| 901 | |
| 902 | if (param->flags & DM_STATUS_TABLE_FLAG) |
| 903 | type = STATUSTYPE_TABLE; |
| 904 | else |
| 905 | type = STATUSTYPE_INFO; |
| 906 | |
| 907 | /* Get all the target info */ |
| 908 | num_targets = dm_table_get_num_targets(table); |
| 909 | for (i = 0; i < num_targets; i++) { |
| 910 | struct dm_target *ti = dm_table_get_target(table, i); |
| 911 | |
| 912 | remaining = len - (outptr - outbuf); |
| 913 | if (remaining <= sizeof(struct dm_target_spec)) { |
| 914 | param->flags |= DM_BUFFER_FULL_FLAG; |
| 915 | break; |
| 916 | } |
| 917 | |
| 918 | spec = (struct dm_target_spec *) outptr; |
| 919 | |
| 920 | spec->status = 0; |
| 921 | spec->sector_start = ti->begin; |
| 922 | spec->length = ti->len; |
| 923 | strncpy(spec->target_type, ti->type->name, |
| 924 | sizeof(spec->target_type)); |
| 925 | |
| 926 | outptr += sizeof(struct dm_target_spec); |
| 927 | remaining = len - (outptr - outbuf); |
| 928 | if (remaining <= 0) { |
| 929 | param->flags |= DM_BUFFER_FULL_FLAG; |
| 930 | break; |
| 931 | } |
| 932 | |
| 933 | /* Get the status/table string from the target driver */ |
| 934 | if (ti->type->status) { |
| 935 | if (ti->type->status(ti, type, outptr, remaining)) { |
| 936 | param->flags |= DM_BUFFER_FULL_FLAG; |
| 937 | break; |
| 938 | } |
| 939 | } else |
| 940 | outptr[0] = '\0'; |
| 941 | |
| 942 | outptr += strlen(outptr) + 1; |
| 943 | used = param->data_start + (outptr - outbuf); |
| 944 | |
| 945 | outptr = align_ptr(outptr); |
| 946 | spec->next = outptr - outbuf; |
| 947 | } |
| 948 | |
| 949 | if (used) |
| 950 | param->data_size = used; |
| 951 | |
| 952 | param->target_count = num_targets; |
| 953 | } |
| 954 | |
| 955 | /* |
| 956 | * Wait for a device to report an event |
| 957 | */ |
| 958 | static int dev_wait(struct dm_ioctl *param, size_t param_size) |
| 959 | { |
| 960 | int r; |
| 961 | struct mapped_device *md; |
| 962 | struct dm_table *table; |
| 963 | |
| 964 | md = find_device(param); |
| 965 | if (!md) |
| 966 | return -ENXIO; |
| 967 | |
| 968 | /* |
| 969 | * Wait for a notification event |
| 970 | */ |
| 971 | if (dm_wait_event(md, param->event_nr)) { |
| 972 | r = -ERESTARTSYS; |
| 973 | goto out; |
| 974 | } |
| 975 | |
| 976 | /* |
| 977 | * The userland program is going to want to know what |
| 978 | * changed to trigger the event, so we may as well tell |
| 979 | * him and save an ioctl. |
| 980 | */ |
| 981 | r = __dev_status(md, param); |
| 982 | if (r) |
| 983 | goto out; |
| 984 | |
| 985 | table = dm_get_table(md); |
| 986 | if (table) { |
| 987 | retrieve_status(table, param, param_size); |
| 988 | dm_table_put(table); |
| 989 | } |
| 990 | |
| 991 | out: |
| 992 | dm_put(md); |
| 993 | return r; |
| 994 | } |
| 995 | |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 996 | static inline fmode_t get_mode(struct dm_ioctl *param) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | { |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 998 | fmode_t mode = FMODE_READ | FMODE_WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
| 1000 | if (param->flags & DM_READONLY_FLAG) |
| 1001 | mode = FMODE_READ; |
| 1002 | |
| 1003 | return mode; |
| 1004 | } |
| 1005 | |
| 1006 | static int next_target(struct dm_target_spec *last, uint32_t next, void *end, |
| 1007 | struct dm_target_spec **spec, char **target_params) |
| 1008 | { |
| 1009 | *spec = (struct dm_target_spec *) ((unsigned char *) last + next); |
| 1010 | *target_params = (char *) (*spec + 1); |
| 1011 | |
| 1012 | if (*spec < (last + 1)) |
| 1013 | return -EINVAL; |
| 1014 | |
| 1015 | return invalid_str(*target_params, end); |
| 1016 | } |
| 1017 | |
| 1018 | static int populate_table(struct dm_table *table, |
| 1019 | struct dm_ioctl *param, size_t param_size) |
| 1020 | { |
| 1021 | int r; |
| 1022 | unsigned int i = 0; |
| 1023 | struct dm_target_spec *spec = (struct dm_target_spec *) param; |
| 1024 | uint32_t next = param->data_start; |
| 1025 | void *end = (void *) param + param_size; |
| 1026 | char *target_params; |
| 1027 | |
| 1028 | if (!param->target_count) { |
| 1029 | DMWARN("populate_table: no targets specified"); |
| 1030 | return -EINVAL; |
| 1031 | } |
| 1032 | |
| 1033 | for (i = 0; i < param->target_count; i++) { |
| 1034 | |
| 1035 | r = next_target(spec, next, end, &spec, &target_params); |
| 1036 | if (r) { |
| 1037 | DMWARN("unable to find target"); |
| 1038 | return r; |
| 1039 | } |
| 1040 | |
| 1041 | r = dm_table_add_target(table, spec->target_type, |
| 1042 | (sector_t) spec->sector_start, |
| 1043 | (sector_t) spec->length, |
| 1044 | target_params); |
| 1045 | if (r) { |
| 1046 | DMWARN("error adding target to table"); |
| 1047 | return r; |
| 1048 | } |
| 1049 | |
| 1050 | next = spec->next; |
| 1051 | } |
| 1052 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1053 | r = dm_table_set_type(table); |
| 1054 | if (r) { |
| 1055 | DMWARN("unable to set table type"); |
| 1056 | return r; |
| 1057 | } |
| 1058 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | return dm_table_complete(table); |
| 1060 | } |
| 1061 | |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1062 | static int table_prealloc_integrity(struct dm_table *t, |
| 1063 | struct mapped_device *md) |
| 1064 | { |
| 1065 | struct list_head *devices = dm_table_get_devices(t); |
| 1066 | struct dm_dev_internal *dd; |
| 1067 | |
| 1068 | list_for_each_entry(dd, devices, list) |
| 1069 | if (bdev_get_integrity(dd->dm_dev.bdev)) |
| 1070 | return blk_integrity_register(dm_disk(md), NULL); |
| 1071 | |
| 1072 | return 0; |
| 1073 | } |
| 1074 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | static int table_load(struct dm_ioctl *param, size_t param_size) |
| 1076 | { |
| 1077 | int r; |
| 1078 | struct hash_cell *hc; |
| 1079 | struct dm_table *t; |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1080 | struct mapped_device *md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1082 | md = find_device(param); |
| 1083 | if (!md) |
| 1084 | return -ENXIO; |
| 1085 | |
| 1086 | r = dm_table_create(&t, get_mode(param), param->target_count, md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | if (r) |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1088 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | |
| 1090 | r = populate_table(t, param, param_size); |
| 1091 | if (r) { |
Mikulas Patocka | f80a557 | 2009-03-16 17:44:26 +0000 | [diff] [blame] | 1092 | dm_table_destroy(t); |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1093 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | } |
| 1095 | |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1096 | r = table_prealloc_integrity(t, md); |
| 1097 | if (r) { |
| 1098 | DMERR("%s: could not register integrity profile.", |
| 1099 | dm_device_name(md)); |
| 1100 | dm_table_destroy(t); |
| 1101 | goto out; |
| 1102 | } |
| 1103 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1104 | r = dm_table_alloc_md_mempools(t); |
| 1105 | if (r) { |
| 1106 | DMWARN("unable to allocate mempools for this table"); |
| 1107 | dm_table_destroy(t); |
| 1108 | goto out; |
| 1109 | } |
| 1110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | down_write(&_hash_lock); |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1112 | hc = dm_get_mdptr(md); |
| 1113 | if (!hc || hc->md != md) { |
| 1114 | DMWARN("device has been removed from the dev hash table."); |
Mikulas Patocka | f80a557 | 2009-03-16 17:44:26 +0000 | [diff] [blame] | 1115 | dm_table_destroy(t); |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1116 | up_write(&_hash_lock); |
| 1117 | r = -ENXIO; |
| 1118 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | } |
| 1120 | |
| 1121 | if (hc->new_map) |
Mikulas Patocka | d581687 | 2009-01-06 03:05:10 +0000 | [diff] [blame] | 1122 | dm_table_destroy(hc->new_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | hc->new_map = t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | up_write(&_hash_lock); |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1125 | |
| 1126 | param->flags |= DM_INACTIVE_PRESENT_FLAG; |
| 1127 | r = __dev_status(md, param); |
| 1128 | |
| 1129 | out: |
| 1130 | dm_put(md); |
| 1131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | return r; |
| 1133 | } |
| 1134 | |
| 1135 | static int table_clear(struct dm_ioctl *param, size_t param_size) |
| 1136 | { |
| 1137 | int r; |
| 1138 | struct hash_cell *hc; |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 1139 | struct mapped_device *md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
| 1141 | down_write(&_hash_lock); |
| 1142 | |
| 1143 | hc = __find_device_hash_cell(param); |
| 1144 | if (!hc) { |
| 1145 | DMWARN("device doesn't appear to be in the dev hash table."); |
| 1146 | up_write(&_hash_lock); |
| 1147 | return -ENXIO; |
| 1148 | } |
| 1149 | |
| 1150 | if (hc->new_map) { |
Mikulas Patocka | d581687 | 2009-01-06 03:05:10 +0000 | [diff] [blame] | 1151 | dm_table_destroy(hc->new_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | hc->new_map = NULL; |
| 1153 | } |
| 1154 | |
| 1155 | param->flags &= ~DM_INACTIVE_PRESENT_FLAG; |
| 1156 | |
| 1157 | r = __dev_status(hc->md, param); |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 1158 | md = hc->md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | up_write(&_hash_lock); |
Jeff Mahoney | 7ec75f2 | 2006-06-26 00:27:24 -0700 | [diff] [blame] | 1160 | dm_put(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | return r; |
| 1162 | } |
| 1163 | |
| 1164 | /* |
| 1165 | * Retrieves a list of devices used by a particular dm device. |
| 1166 | */ |
| 1167 | static void retrieve_deps(struct dm_table *table, |
| 1168 | struct dm_ioctl *param, size_t param_size) |
| 1169 | { |
| 1170 | unsigned int count = 0; |
| 1171 | struct list_head *tmp; |
| 1172 | size_t len, needed; |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 1173 | struct dm_dev_internal *dd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | struct dm_target_deps *deps; |
| 1175 | |
| 1176 | deps = get_result_buffer(param, param_size, &len); |
| 1177 | |
| 1178 | /* |
| 1179 | * Count the devices. |
| 1180 | */ |
| 1181 | list_for_each (tmp, dm_table_get_devices(table)) |
| 1182 | count++; |
| 1183 | |
| 1184 | /* |
| 1185 | * Check we have enough space. |
| 1186 | */ |
| 1187 | needed = sizeof(*deps) + (sizeof(*deps->dev) * count); |
| 1188 | if (len < needed) { |
| 1189 | param->flags |= DM_BUFFER_FULL_FLAG; |
| 1190 | return; |
| 1191 | } |
| 1192 | |
| 1193 | /* |
| 1194 | * Fill in the devices. |
| 1195 | */ |
| 1196 | deps->count = count; |
| 1197 | count = 0; |
| 1198 | list_for_each_entry (dd, dm_table_get_devices(table), list) |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 1199 | deps->dev[count++] = huge_encode_dev(dd->dm_dev.bdev->bd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | |
| 1201 | param->data_size = param->data_start + needed; |
| 1202 | } |
| 1203 | |
| 1204 | static int table_deps(struct dm_ioctl *param, size_t param_size) |
| 1205 | { |
| 1206 | int r = 0; |
| 1207 | struct mapped_device *md; |
| 1208 | struct dm_table *table; |
| 1209 | |
| 1210 | md = find_device(param); |
| 1211 | if (!md) |
| 1212 | return -ENXIO; |
| 1213 | |
| 1214 | r = __dev_status(md, param); |
| 1215 | if (r) |
| 1216 | goto out; |
| 1217 | |
| 1218 | table = dm_get_table(md); |
| 1219 | if (table) { |
| 1220 | retrieve_deps(table, param, param_size); |
| 1221 | dm_table_put(table); |
| 1222 | } |
| 1223 | |
| 1224 | out: |
| 1225 | dm_put(md); |
| 1226 | return r; |
| 1227 | } |
| 1228 | |
| 1229 | /* |
| 1230 | * Return the status of a device as a text string for each |
| 1231 | * target. |
| 1232 | */ |
| 1233 | static int table_status(struct dm_ioctl *param, size_t param_size) |
| 1234 | { |
| 1235 | int r; |
| 1236 | struct mapped_device *md; |
| 1237 | struct dm_table *table; |
| 1238 | |
| 1239 | md = find_device(param); |
| 1240 | if (!md) |
| 1241 | return -ENXIO; |
| 1242 | |
| 1243 | r = __dev_status(md, param); |
| 1244 | if (r) |
| 1245 | goto out; |
| 1246 | |
| 1247 | table = dm_get_table(md); |
| 1248 | if (table) { |
| 1249 | retrieve_status(table, param, param_size); |
| 1250 | dm_table_put(table); |
| 1251 | } |
| 1252 | |
| 1253 | out: |
| 1254 | dm_put(md); |
| 1255 | return r; |
| 1256 | } |
| 1257 | |
| 1258 | /* |
| 1259 | * Pass a message to the target that's at the supplied device offset. |
| 1260 | */ |
| 1261 | static int target_message(struct dm_ioctl *param, size_t param_size) |
| 1262 | { |
| 1263 | int r, argc; |
| 1264 | char **argv; |
| 1265 | struct mapped_device *md; |
| 1266 | struct dm_table *table; |
| 1267 | struct dm_target *ti; |
| 1268 | struct dm_target_msg *tmsg = (void *) param + param->data_start; |
| 1269 | |
| 1270 | md = find_device(param); |
| 1271 | if (!md) |
| 1272 | return -ENXIO; |
| 1273 | |
| 1274 | r = __dev_status(md, param); |
| 1275 | if (r) |
| 1276 | goto out; |
| 1277 | |
Milan Broz | 027d50f | 2007-10-19 22:38:36 +0100 | [diff] [blame] | 1278 | if (tmsg < (struct dm_target_msg *) param->data || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | invalid_str(tmsg->message, (void *) param + param_size)) { |
| 1280 | DMWARN("Invalid target message parameters."); |
| 1281 | r = -EINVAL; |
| 1282 | goto out; |
| 1283 | } |
| 1284 | |
| 1285 | r = dm_split_args(&argc, &argv, tmsg->message); |
| 1286 | if (r) { |
| 1287 | DMWARN("Failed to split target message parameters"); |
| 1288 | goto out; |
| 1289 | } |
| 1290 | |
| 1291 | table = dm_get_table(md); |
| 1292 | if (!table) |
| 1293 | goto out_argv; |
| 1294 | |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1295 | ti = dm_table_find_target(table, tmsg->sector); |
| 1296 | if (!dm_target_is_valid(ti)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | DMWARN("Target message sector outside device."); |
| 1298 | r = -EINVAL; |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1299 | } else if (ti->type->message) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | r = ti->type->message(ti, argc, argv); |
| 1301 | else { |
| 1302 | DMWARN("Target type does not support messages"); |
| 1303 | r = -EINVAL; |
| 1304 | } |
| 1305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | dm_table_put(table); |
| 1307 | out_argv: |
| 1308 | kfree(argv); |
| 1309 | out: |
| 1310 | param->data_size = 0; |
| 1311 | dm_put(md); |
| 1312 | return r; |
| 1313 | } |
| 1314 | |
| 1315 | /*----------------------------------------------------------------- |
| 1316 | * Implementation of open/close/ioctl on the special char |
| 1317 | * device. |
| 1318 | *---------------------------------------------------------------*/ |
| 1319 | static ioctl_fn lookup_ioctl(unsigned int cmd) |
| 1320 | { |
| 1321 | static struct { |
| 1322 | int cmd; |
| 1323 | ioctl_fn fn; |
| 1324 | } _ioctls[] = { |
| 1325 | {DM_VERSION_CMD, NULL}, /* version is dealt with elsewhere */ |
| 1326 | {DM_REMOVE_ALL_CMD, remove_all}, |
| 1327 | {DM_LIST_DEVICES_CMD, list_devices}, |
| 1328 | |
| 1329 | {DM_DEV_CREATE_CMD, dev_create}, |
| 1330 | {DM_DEV_REMOVE_CMD, dev_remove}, |
| 1331 | {DM_DEV_RENAME_CMD, dev_rename}, |
| 1332 | {DM_DEV_SUSPEND_CMD, dev_suspend}, |
| 1333 | {DM_DEV_STATUS_CMD, dev_status}, |
| 1334 | {DM_DEV_WAIT_CMD, dev_wait}, |
| 1335 | |
| 1336 | {DM_TABLE_LOAD_CMD, table_load}, |
| 1337 | {DM_TABLE_CLEAR_CMD, table_clear}, |
| 1338 | {DM_TABLE_DEPS_CMD, table_deps}, |
| 1339 | {DM_TABLE_STATUS_CMD, table_status}, |
| 1340 | |
| 1341 | {DM_LIST_VERSIONS_CMD, list_versions}, |
| 1342 | |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1343 | {DM_TARGET_MSG_CMD, target_message}, |
| 1344 | {DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | }; |
| 1346 | |
| 1347 | return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn; |
| 1348 | } |
| 1349 | |
| 1350 | /* |
| 1351 | * As well as checking the version compatibility this always |
| 1352 | * copies the kernel interface version out. |
| 1353 | */ |
| 1354 | static int check_version(unsigned int cmd, struct dm_ioctl __user *user) |
| 1355 | { |
| 1356 | uint32_t version[3]; |
| 1357 | int r = 0; |
| 1358 | |
| 1359 | if (copy_from_user(version, user->version, sizeof(version))) |
| 1360 | return -EFAULT; |
| 1361 | |
| 1362 | if ((DM_VERSION_MAJOR != version[0]) || |
| 1363 | (DM_VERSION_MINOR < version[1])) { |
| 1364 | DMWARN("ioctl interface mismatch: " |
| 1365 | "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)", |
| 1366 | DM_VERSION_MAJOR, DM_VERSION_MINOR, |
| 1367 | DM_VERSION_PATCHLEVEL, |
| 1368 | version[0], version[1], version[2], cmd); |
| 1369 | r = -EINVAL; |
| 1370 | } |
| 1371 | |
| 1372 | /* |
| 1373 | * Fill in the kernel version. |
| 1374 | */ |
| 1375 | version[0] = DM_VERSION_MAJOR; |
| 1376 | version[1] = DM_VERSION_MINOR; |
| 1377 | version[2] = DM_VERSION_PATCHLEVEL; |
| 1378 | if (copy_to_user(user->version, version, sizeof(version))) |
| 1379 | return -EFAULT; |
| 1380 | |
| 1381 | return r; |
| 1382 | } |
| 1383 | |
| 1384 | static void free_params(struct dm_ioctl *param) |
| 1385 | { |
| 1386 | vfree(param); |
| 1387 | } |
| 1388 | |
| 1389 | static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param) |
| 1390 | { |
| 1391 | struct dm_ioctl tmp, *dmi; |
| 1392 | |
Milan Broz | 76c072b | 2008-02-08 02:09:56 +0000 | [diff] [blame] | 1393 | if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | return -EFAULT; |
| 1395 | |
Milan Broz | 76c072b | 2008-02-08 02:09:56 +0000 | [diff] [blame] | 1396 | if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | return -EINVAL; |
| 1398 | |
Jesper Juhl | bb56acf | 2007-10-19 22:38:54 +0100 | [diff] [blame] | 1399 | dmi = vmalloc(tmp.data_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | if (!dmi) |
| 1401 | return -ENOMEM; |
| 1402 | |
| 1403 | if (copy_from_user(dmi, user, tmp.data_size)) { |
| 1404 | vfree(dmi); |
| 1405 | return -EFAULT; |
| 1406 | } |
| 1407 | |
| 1408 | *param = dmi; |
| 1409 | return 0; |
| 1410 | } |
| 1411 | |
| 1412 | static int validate_params(uint cmd, struct dm_ioctl *param) |
| 1413 | { |
| 1414 | /* Always clear this flag */ |
| 1415 | param->flags &= ~DM_BUFFER_FULL_FLAG; |
| 1416 | |
| 1417 | /* Ignores parameters */ |
| 1418 | if (cmd == DM_REMOVE_ALL_CMD || |
| 1419 | cmd == DM_LIST_DEVICES_CMD || |
| 1420 | cmd == DM_LIST_VERSIONS_CMD) |
| 1421 | return 0; |
| 1422 | |
| 1423 | if ((cmd == DM_DEV_CREATE_CMD)) { |
| 1424 | if (!*param->name) { |
| 1425 | DMWARN("name not supplied when creating device"); |
| 1426 | return -EINVAL; |
| 1427 | } |
| 1428 | } else if ((*param->uuid && *param->name)) { |
| 1429 | DMWARN("only supply one of name or uuid, cmd(%u)", cmd); |
| 1430 | return -EINVAL; |
| 1431 | } |
| 1432 | |
| 1433 | /* Ensure strings are terminated */ |
| 1434 | param->name[DM_NAME_LEN - 1] = '\0'; |
| 1435 | param->uuid[DM_UUID_LEN - 1] = '\0'; |
| 1436 | |
| 1437 | return 0; |
| 1438 | } |
| 1439 | |
Alasdair G Kergon | 27238b2 | 2008-02-08 02:09:53 +0000 | [diff] [blame] | 1440 | static int ctl_ioctl(uint command, struct dm_ioctl __user *user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | { |
| 1442 | int r = 0; |
| 1443 | unsigned int cmd; |
Andrew Morton | a26ffd4 | 2008-02-08 02:10:16 +0000 | [diff] [blame] | 1444 | struct dm_ioctl *uninitialized_var(param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | ioctl_fn fn = NULL; |
| 1446 | size_t param_size; |
| 1447 | |
| 1448 | /* only root can play with this */ |
| 1449 | if (!capable(CAP_SYS_ADMIN)) |
| 1450 | return -EACCES; |
| 1451 | |
| 1452 | if (_IOC_TYPE(command) != DM_IOCTL) |
| 1453 | return -ENOTTY; |
| 1454 | |
| 1455 | cmd = _IOC_NR(command); |
| 1456 | |
| 1457 | /* |
| 1458 | * Check the interface version passed in. This also |
| 1459 | * writes out the kernel's interface version. |
| 1460 | */ |
| 1461 | r = check_version(cmd, user); |
| 1462 | if (r) |
| 1463 | return r; |
| 1464 | |
| 1465 | /* |
| 1466 | * Nothing more to do for the version command. |
| 1467 | */ |
| 1468 | if (cmd == DM_VERSION_CMD) |
| 1469 | return 0; |
| 1470 | |
| 1471 | fn = lookup_ioctl(cmd); |
| 1472 | if (!fn) { |
| 1473 | DMWARN("dm_ctl_ioctl: unknown command 0x%x", command); |
| 1474 | return -ENOTTY; |
| 1475 | } |
| 1476 | |
| 1477 | /* |
| 1478 | * Trying to avoid low memory issues when a device is |
| 1479 | * suspended. |
| 1480 | */ |
| 1481 | current->flags |= PF_MEMALLOC; |
| 1482 | |
| 1483 | /* |
| 1484 | * Copy the parameters into kernel space. |
| 1485 | */ |
| 1486 | r = copy_params(user, ¶m); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | |
Alasdair G Kergon | dab6a42 | 2006-02-01 03:04:52 -0800 | [diff] [blame] | 1488 | current->flags &= ~PF_MEMALLOC; |
| 1489 | |
| 1490 | if (r) |
| 1491 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | |
| 1493 | r = validate_params(cmd, param); |
| 1494 | if (r) |
| 1495 | goto out; |
| 1496 | |
| 1497 | param_size = param->data_size; |
| 1498 | param->data_size = sizeof(*param); |
| 1499 | r = fn(param, param_size); |
| 1500 | |
| 1501 | /* |
| 1502 | * Copy the results back to userland. |
| 1503 | */ |
| 1504 | if (!r && copy_to_user(user, param, param->data_size)) |
| 1505 | r = -EFAULT; |
| 1506 | |
| 1507 | out: |
| 1508 | free_params(param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | return r; |
| 1510 | } |
| 1511 | |
Alasdair G Kergon | 27238b2 | 2008-02-08 02:09:53 +0000 | [diff] [blame] | 1512 | static long dm_ctl_ioctl(struct file *file, uint command, ulong u) |
| 1513 | { |
| 1514 | return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u); |
| 1515 | } |
| 1516 | |
Milan Broz | 76c072b | 2008-02-08 02:09:56 +0000 | [diff] [blame] | 1517 | #ifdef CONFIG_COMPAT |
| 1518 | static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u) |
| 1519 | { |
| 1520 | return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u)); |
| 1521 | } |
| 1522 | #else |
| 1523 | #define dm_compat_ctl_ioctl NULL |
| 1524 | #endif |
| 1525 | |
Arjan van de Ven | fa027c2 | 2007-02-12 00:55:33 -0800 | [diff] [blame] | 1526 | static const struct file_operations _ctl_fops = { |
Alasdair G Kergon | 27238b2 | 2008-02-08 02:09:53 +0000 | [diff] [blame] | 1527 | .unlocked_ioctl = dm_ctl_ioctl, |
Milan Broz | 76c072b | 2008-02-08 02:09:56 +0000 | [diff] [blame] | 1528 | .compat_ioctl = dm_compat_ctl_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | .owner = THIS_MODULE, |
| 1530 | }; |
| 1531 | |
| 1532 | static struct miscdevice _dm_misc = { |
| 1533 | .minor = MISC_DYNAMIC_MINOR, |
| 1534 | .name = DM_NAME, |
Kay Sievers | d405640 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 1535 | .devnode = "mapper/control", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | .fops = &_ctl_fops |
| 1537 | }; |
| 1538 | |
| 1539 | /* |
| 1540 | * Create misc character device and link to DM_DIR/control. |
| 1541 | */ |
| 1542 | int __init dm_interface_init(void) |
| 1543 | { |
| 1544 | int r; |
| 1545 | |
| 1546 | r = dm_hash_init(); |
| 1547 | if (r) |
| 1548 | return r; |
| 1549 | |
| 1550 | r = misc_register(&_dm_misc); |
| 1551 | if (r) { |
| 1552 | DMERR("misc_register failed for control device"); |
| 1553 | dm_hash_exit(); |
| 1554 | return r; |
| 1555 | } |
| 1556 | |
| 1557 | DMINFO("%d.%d.%d%s initialised: %s", DM_VERSION_MAJOR, |
| 1558 | DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, DM_VERSION_EXTRA, |
| 1559 | DM_DRIVER_EMAIL); |
| 1560 | return 0; |
| 1561 | } |
| 1562 | |
| 1563 | void dm_interface_exit(void) |
| 1564 | { |
| 1565 | if (misc_deregister(&_dm_misc) < 0) |
| 1566 | DMERR("misc_deregister failed for control device"); |
| 1567 | |
| 1568 | dm_hash_exit(); |
| 1569 | } |
Mike Anderson | 96a1f7d | 2007-10-19 22:47:59 +0100 | [diff] [blame] | 1570 | |
| 1571 | /** |
| 1572 | * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers |
| 1573 | * @md: Pointer to mapped_device |
| 1574 | * @name: Buffer (size DM_NAME_LEN) for name |
| 1575 | * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined |
| 1576 | */ |
| 1577 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) |
| 1578 | { |
| 1579 | int r = 0; |
| 1580 | struct hash_cell *hc; |
| 1581 | |
| 1582 | if (!md) |
| 1583 | return -ENXIO; |
| 1584 | |
| 1585 | dm_get(md); |
| 1586 | down_read(&_hash_lock); |
| 1587 | hc = dm_get_mdptr(md); |
| 1588 | if (!hc || hc->md != md) { |
| 1589 | r = -ENXIO; |
| 1590 | goto out; |
| 1591 | } |
| 1592 | |
Milan Broz | 23d39f6 | 2009-01-06 03:05:04 +0000 | [diff] [blame] | 1593 | if (name) |
| 1594 | strcpy(name, hc->name); |
| 1595 | if (uuid) |
| 1596 | strcpy(uuid, hc->uuid ? : ""); |
Mike Anderson | 96a1f7d | 2007-10-19 22:47:59 +0100 | [diff] [blame] | 1597 | |
| 1598 | out: |
| 1599 | up_read(&_hash_lock); |
| 1600 | dm_put(md); |
| 1601 | |
| 1602 | return r; |
| 1603 | } |