Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) International Business Machines Corp., 2006 |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 12 | * the GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | * |
| 18 | * Author: Artem Bityutskiy (Битюцкий Артём) |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * This file contains implementation of volume creation, deletion, updating and |
| 23 | * resizing. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/err.h> |
| 27 | #include <asm/div64.h> |
| 28 | #include "ubi.h" |
| 29 | |
| 30 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID |
| 31 | static void paranoid_check_volumes(struct ubi_device *ubi); |
| 32 | #else |
| 33 | #define paranoid_check_volumes(ubi) |
| 34 | #endif |
| 35 | |
| 36 | static ssize_t vol_attribute_show(struct device *dev, |
| 37 | struct device_attribute *attr, char *buf); |
| 38 | |
| 39 | /* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */ |
| 40 | static struct device_attribute vol_reserved_ebs = |
| 41 | __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL); |
| 42 | static struct device_attribute vol_type = |
| 43 | __ATTR(type, S_IRUGO, vol_attribute_show, NULL); |
| 44 | static struct device_attribute vol_name = |
| 45 | __ATTR(name, S_IRUGO, vol_attribute_show, NULL); |
| 46 | static struct device_attribute vol_corrupted = |
| 47 | __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL); |
| 48 | static struct device_attribute vol_alignment = |
| 49 | __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL); |
| 50 | static struct device_attribute vol_usable_eb_size = |
| 51 | __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL); |
| 52 | static struct device_attribute vol_data_bytes = |
| 53 | __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL); |
| 54 | static struct device_attribute vol_upd_marker = |
| 55 | __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL); |
| 56 | |
| 57 | /* |
| 58 | * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'. |
| 59 | * |
| 60 | * Consider a situation: |
| 61 | * A. process 1 opens a sysfs file related to volume Y, say |
| 62 | * /<sysfs>/class/ubi/ubiX_Y/reserved_ebs; |
| 63 | * B. process 2 removes volume Y; |
| 64 | * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file; |
| 65 | * |
| 66 | * What we want to do in a situation like that is to return error when the file |
| 67 | * is read. This is done by means of the 'removed' flag and the 'vol_lock' of |
| 68 | * the UBI volume description object. |
| 69 | */ |
| 70 | static ssize_t vol_attribute_show(struct device *dev, |
| 71 | struct device_attribute *attr, char *buf) |
| 72 | { |
| 73 | int ret; |
| 74 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); |
| 75 | |
| 76 | spin_lock(&vol->ubi->volumes_lock); |
| 77 | if (vol->removed) { |
| 78 | spin_unlock(&vol->ubi->volumes_lock); |
| 79 | return -ENODEV; |
| 80 | } |
| 81 | if (attr == &vol_reserved_ebs) |
| 82 | ret = sprintf(buf, "%d\n", vol->reserved_pebs); |
| 83 | else if (attr == &vol_type) { |
| 84 | const char *tp; |
| 85 | tp = vol->vol_type == UBI_DYNAMIC_VOLUME ? "dynamic" : "static"; |
| 86 | ret = sprintf(buf, "%s\n", tp); |
| 87 | } else if (attr == &vol_name) |
| 88 | ret = sprintf(buf, "%s\n", vol->name); |
| 89 | else if (attr == &vol_corrupted) |
| 90 | ret = sprintf(buf, "%d\n", vol->corrupted); |
| 91 | else if (attr == &vol_alignment) |
| 92 | ret = sprintf(buf, "%d\n", vol->alignment); |
| 93 | else if (attr == &vol_usable_eb_size) { |
| 94 | ret = sprintf(buf, "%d\n", vol->usable_leb_size); |
| 95 | } else if (attr == &vol_data_bytes) |
| 96 | ret = sprintf(buf, "%lld\n", vol->used_bytes); |
| 97 | else if (attr == &vol_upd_marker) |
| 98 | ret = sprintf(buf, "%d\n", vol->upd_marker); |
| 99 | else |
| 100 | BUG(); |
| 101 | spin_unlock(&vol->ubi->volumes_lock); |
| 102 | return ret; |
| 103 | } |
| 104 | |
| 105 | /* Release method for volume devices */ |
| 106 | static void vol_release(struct device *dev) |
| 107 | { |
| 108 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); |
| 109 | ubi_assert(vol->removed); |
| 110 | kfree(vol); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * volume_sysfs_init - initialize sysfs for new volume. |
| 115 | * @ubi: UBI device description object |
| 116 | * @vol: volume description object |
| 117 | * |
| 118 | * This function returns zero in case of success and a negative error code in |
| 119 | * case of failure. |
| 120 | * |
| 121 | * Note, this function does not free allocated resources in case of failure - |
| 122 | * the caller does it. This is because this would cause release() here and the |
| 123 | * caller would oops. |
| 124 | */ |
| 125 | static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol) |
| 126 | { |
| 127 | int err; |
| 128 | |
| 129 | err = device_create_file(&vol->dev, &vol_reserved_ebs); |
| 130 | if (err) |
| 131 | return err; |
| 132 | err = device_create_file(&vol->dev, &vol_type); |
| 133 | if (err) |
| 134 | return err; |
| 135 | err = device_create_file(&vol->dev, &vol_name); |
| 136 | if (err) |
| 137 | return err; |
| 138 | err = device_create_file(&vol->dev, &vol_corrupted); |
| 139 | if (err) |
| 140 | return err; |
| 141 | err = device_create_file(&vol->dev, &vol_alignment); |
| 142 | if (err) |
| 143 | return err; |
| 144 | err = device_create_file(&vol->dev, &vol_usable_eb_size); |
| 145 | if (err) |
| 146 | return err; |
| 147 | err = device_create_file(&vol->dev, &vol_data_bytes); |
| 148 | if (err) |
| 149 | return err; |
| 150 | err = device_create_file(&vol->dev, &vol_upd_marker); |
| 151 | if (err) |
| 152 | return err; |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * volume_sysfs_close - close sysfs for a volume. |
| 158 | * @vol: volume description object |
| 159 | */ |
| 160 | static void volume_sysfs_close(struct ubi_volume *vol) |
| 161 | { |
| 162 | device_remove_file(&vol->dev, &vol_upd_marker); |
| 163 | device_remove_file(&vol->dev, &vol_data_bytes); |
| 164 | device_remove_file(&vol->dev, &vol_usable_eb_size); |
| 165 | device_remove_file(&vol->dev, &vol_alignment); |
| 166 | device_remove_file(&vol->dev, &vol_corrupted); |
| 167 | device_remove_file(&vol->dev, &vol_name); |
| 168 | device_remove_file(&vol->dev, &vol_type); |
| 169 | device_remove_file(&vol->dev, &vol_reserved_ebs); |
| 170 | device_unregister(&vol->dev); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * ubi_create_volume - create volume. |
| 175 | * @ubi: UBI device description object |
| 176 | * @req: volume creation request |
| 177 | * |
| 178 | * This function creates volume described by @req. If @req->vol_id id |
| 179 | * %UBI_VOL_NUM_AUTO, this function automatically assigne ID to the new volume |
| 180 | * and saves it in @req->vol_id. Returns zero in case of success and a negative |
| 181 | * error code in case of failure. |
| 182 | */ |
| 183 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) |
| 184 | { |
| 185 | int i, err, vol_id = req->vol_id; |
| 186 | struct ubi_volume *vol; |
| 187 | struct ubi_vtbl_record vtbl_rec; |
| 188 | uint64_t bytes; |
| 189 | |
| 190 | if (ubi->ro_mode) |
| 191 | return -EROFS; |
| 192 | |
| 193 | vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); |
| 194 | if (!vol) |
| 195 | return -ENOMEM; |
| 196 | |
| 197 | spin_lock(&ubi->volumes_lock); |
| 198 | |
| 199 | if (vol_id == UBI_VOL_NUM_AUTO) { |
| 200 | /* Find unused volume ID */ |
| 201 | dbg_msg("search for vacant volume ID"); |
| 202 | for (i = 0; i < ubi->vtbl_slots; i++) |
| 203 | if (!ubi->volumes[i]) { |
| 204 | vol_id = i; |
| 205 | break; |
| 206 | } |
| 207 | |
| 208 | if (vol_id == UBI_VOL_NUM_AUTO) { |
| 209 | dbg_err("out of volume IDs"); |
| 210 | err = -ENFILE; |
| 211 | goto out_unlock; |
| 212 | } |
| 213 | req->vol_id = vol_id; |
| 214 | } |
| 215 | |
| 216 | dbg_msg("volume ID %d, %llu bytes, type %d, name %s", |
| 217 | vol_id, (unsigned long long)req->bytes, |
| 218 | (int)req->vol_type, req->name); |
| 219 | |
| 220 | /* Ensure that this volume does not exist */ |
| 221 | err = -EEXIST; |
| 222 | if (ubi->volumes[vol_id]) { |
| 223 | dbg_err("volume %d already exists", vol_id); |
| 224 | goto out_unlock; |
| 225 | } |
| 226 | |
| 227 | /* Ensure that the name is unique */ |
| 228 | for (i = 0; i < ubi->vtbl_slots; i++) |
| 229 | if (ubi->volumes[i] && |
| 230 | ubi->volumes[i]->name_len == req->name_len && |
| 231 | strcmp(ubi->volumes[i]->name, req->name) == 0) { |
| 232 | dbg_err("volume \"%s\" exists (ID %d)", req->name, i); |
| 233 | goto out_unlock; |
| 234 | } |
| 235 | |
| 236 | /* Calculate how many eraseblocks are requested */ |
| 237 | vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; |
| 238 | bytes = req->bytes; |
| 239 | if (do_div(bytes, vol->usable_leb_size)) |
| 240 | vol->reserved_pebs = 1; |
| 241 | vol->reserved_pebs += bytes; |
| 242 | |
| 243 | /* Reserve physical eraseblocks */ |
| 244 | if (vol->reserved_pebs > ubi->avail_pebs) { |
| 245 | dbg_err("not enough PEBs, only %d available", ubi->avail_pebs); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 246 | err = -ENOSPC; |
| 247 | goto out_unlock; |
| 248 | } |
| 249 | ubi->avail_pebs -= vol->reserved_pebs; |
| 250 | ubi->rsvd_pebs += vol->reserved_pebs; |
| 251 | |
| 252 | vol->vol_id = vol_id; |
| 253 | vol->alignment = req->alignment; |
| 254 | vol->data_pad = ubi->leb_size % vol->alignment; |
| 255 | vol->vol_type = req->vol_type; |
| 256 | vol->name_len = req->name_len; |
| 257 | memcpy(vol->name, req->name, vol->name_len + 1); |
| 258 | vol->exclusive = 1; |
| 259 | vol->ubi = ubi; |
| 260 | ubi->volumes[vol_id] = vol; |
| 261 | spin_unlock(&ubi->volumes_lock); |
| 262 | |
| 263 | /* |
| 264 | * Finish all pending erases because there may be some LEBs belonging |
| 265 | * to the same volume ID. |
| 266 | */ |
| 267 | err = ubi_wl_flush(ubi); |
| 268 | if (err) |
| 269 | goto out_acc; |
| 270 | |
| 271 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); |
| 272 | if (!vol->eba_tbl) { |
| 273 | err = -ENOMEM; |
| 274 | goto out_acc; |
| 275 | } |
| 276 | |
| 277 | for (i = 0; i < vol->reserved_pebs; i++) |
| 278 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; |
| 279 | |
| 280 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
| 281 | vol->used_ebs = vol->reserved_pebs; |
| 282 | vol->last_eb_bytes = vol->usable_leb_size; |
| 283 | vol->used_bytes = vol->used_ebs * vol->usable_leb_size; |
| 284 | } else { |
| 285 | bytes = vol->used_bytes; |
| 286 | vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size); |
| 287 | vol->used_ebs = bytes; |
| 288 | if (vol->last_eb_bytes) |
| 289 | vol->used_ebs += 1; |
| 290 | else |
| 291 | vol->last_eb_bytes = vol->usable_leb_size; |
| 292 | } |
| 293 | |
| 294 | /* Register character device for the volume */ |
| 295 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); |
| 296 | vol->cdev.owner = THIS_MODULE; |
| 297 | err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol_id + 1), 1); |
| 298 | if (err) { |
| 299 | ubi_err("cannot add character device for volume %d", vol_id); |
| 300 | goto out_mapping; |
| 301 | } |
| 302 | |
| 303 | err = ubi_create_gluebi(ubi, vol); |
| 304 | if (err) |
| 305 | goto out_cdev; |
| 306 | |
| 307 | vol->dev.release = vol_release; |
| 308 | vol->dev.parent = &ubi->dev; |
| 309 | vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1); |
| 310 | vol->dev.class = ubi_class; |
| 311 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); |
| 312 | err = device_register(&vol->dev); |
| 313 | if (err) |
| 314 | goto out_gluebi; |
| 315 | |
| 316 | err = volume_sysfs_init(ubi, vol); |
| 317 | if (err) |
| 318 | goto out_sysfs; |
| 319 | |
| 320 | /* Fill volume table record */ |
| 321 | memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); |
| 322 | vtbl_rec.reserved_pebs = cpu_to_ubi32(vol->reserved_pebs); |
| 323 | vtbl_rec.alignment = cpu_to_ubi32(vol->alignment); |
| 324 | vtbl_rec.data_pad = cpu_to_ubi32(vol->data_pad); |
| 325 | vtbl_rec.name_len = cpu_to_ubi16(vol->name_len); |
| 326 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
| 327 | vtbl_rec.vol_type = UBI_VID_DYNAMIC; |
| 328 | else |
| 329 | vtbl_rec.vol_type = UBI_VID_STATIC; |
| 330 | memcpy(vtbl_rec.name, vol->name, vol->name_len + 1); |
| 331 | |
| 332 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
| 333 | if (err) |
| 334 | goto out_sysfs; |
| 335 | |
| 336 | spin_lock(&ubi->volumes_lock); |
| 337 | ubi->vol_count += 1; |
| 338 | vol->exclusive = 0; |
| 339 | spin_unlock(&ubi->volumes_lock); |
| 340 | |
| 341 | paranoid_check_volumes(ubi); |
| 342 | return 0; |
| 343 | |
| 344 | out_gluebi: |
| 345 | err = ubi_destroy_gluebi(vol); |
| 346 | out_cdev: |
| 347 | cdev_del(&vol->cdev); |
| 348 | out_mapping: |
| 349 | kfree(vol->eba_tbl); |
| 350 | out_acc: |
| 351 | spin_lock(&ubi->volumes_lock); |
| 352 | ubi->rsvd_pebs -= vol->reserved_pebs; |
| 353 | ubi->avail_pebs += vol->reserved_pebs; |
| 354 | out_unlock: |
| 355 | spin_unlock(&ubi->volumes_lock); |
| 356 | kfree(vol); |
| 357 | return err; |
| 358 | |
| 359 | /* |
| 360 | * We are registered, so @vol is destroyed in the release function and |
| 361 | * we have to de-initialize differently. |
| 362 | */ |
| 363 | out_sysfs: |
| 364 | err = ubi_destroy_gluebi(vol); |
| 365 | cdev_del(&vol->cdev); |
| 366 | kfree(vol->eba_tbl); |
| 367 | spin_lock(&ubi->volumes_lock); |
| 368 | ubi->rsvd_pebs -= vol->reserved_pebs; |
| 369 | ubi->avail_pebs += vol->reserved_pebs; |
| 370 | spin_unlock(&ubi->volumes_lock); |
| 371 | volume_sysfs_close(vol); |
| 372 | return err; |
| 373 | } |
| 374 | |
| 375 | /** |
| 376 | * ubi_remove_volume - remove volume. |
| 377 | * @desc: volume descriptor |
| 378 | * |
| 379 | * This function removes volume described by @desc. The volume has to be opened |
| 380 | * in "exclusive" mode. Returns zero in case of success and a negative error |
| 381 | * code in case of failure. |
| 382 | */ |
| 383 | int ubi_remove_volume(struct ubi_volume_desc *desc) |
| 384 | { |
| 385 | struct ubi_volume *vol = desc->vol; |
| 386 | struct ubi_device *ubi = vol->ubi; |
| 387 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; |
| 388 | |
| 389 | dbg_msg("remove UBI volume %d", vol_id); |
| 390 | ubi_assert(desc->mode == UBI_EXCLUSIVE); |
| 391 | ubi_assert(vol == ubi->volumes[vol_id]); |
| 392 | |
| 393 | if (ubi->ro_mode) |
| 394 | return -EROFS; |
| 395 | |
| 396 | err = ubi_destroy_gluebi(vol); |
| 397 | if (err) |
| 398 | return err; |
| 399 | |
| 400 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); |
| 401 | if (err) |
| 402 | return err; |
| 403 | |
| 404 | for (i = 0; i < vol->reserved_pebs; i++) { |
| 405 | err = ubi_eba_unmap_leb(ubi, vol_id, i); |
| 406 | if (err) |
| 407 | return err; |
| 408 | } |
| 409 | |
| 410 | spin_lock(&ubi->volumes_lock); |
| 411 | vol->removed = 1; |
| 412 | ubi->volumes[vol_id] = NULL; |
| 413 | spin_unlock(&ubi->volumes_lock); |
| 414 | |
| 415 | kfree(vol->eba_tbl); |
| 416 | vol->eba_tbl = NULL; |
| 417 | cdev_del(&vol->cdev); |
| 418 | volume_sysfs_close(vol); |
| 419 | kfree(desc); |
| 420 | |
| 421 | spin_lock(&ubi->volumes_lock); |
| 422 | ubi->rsvd_pebs -= reserved_pebs; |
| 423 | ubi->avail_pebs += reserved_pebs; |
| 424 | i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; |
| 425 | if (i > 0) { |
| 426 | i = ubi->avail_pebs >= i ? i : ubi->avail_pebs; |
| 427 | ubi->avail_pebs -= i; |
| 428 | ubi->rsvd_pebs += i; |
| 429 | ubi->beb_rsvd_pebs += i; |
| 430 | if (i > 0) |
| 431 | ubi_msg("reserve more %d PEBs", i); |
| 432 | } |
| 433 | ubi->vol_count -= 1; |
| 434 | spin_unlock(&ubi->volumes_lock); |
| 435 | |
| 436 | paranoid_check_volumes(ubi); |
| 437 | module_put(THIS_MODULE); |
| 438 | return 0; |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * ubi_resize_volume - re-size volume. |
| 443 | * @desc: volume descriptor |
| 444 | * @reserved_pebs: new size in physical eraseblocks |
| 445 | * |
| 446 | * This function returns zero in case of success, and a negative error code in |
| 447 | * case of failure. |
| 448 | */ |
| 449 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) |
| 450 | { |
| 451 | int i, err, pebs, *new_mapping; |
| 452 | struct ubi_volume *vol = desc->vol; |
| 453 | struct ubi_device *ubi = vol->ubi; |
| 454 | struct ubi_vtbl_record vtbl_rec; |
| 455 | int vol_id = vol->vol_id; |
| 456 | |
| 457 | if (ubi->ro_mode) |
| 458 | return -EROFS; |
| 459 | |
| 460 | dbg_msg("re-size volume %d to from %d to %d PEBs", |
| 461 | vol_id, vol->reserved_pebs, reserved_pebs); |
| 462 | ubi_assert(desc->mode == UBI_EXCLUSIVE); |
| 463 | ubi_assert(vol == ubi->volumes[vol_id]); |
| 464 | |
| 465 | if (vol->vol_type == UBI_STATIC_VOLUME && |
| 466 | reserved_pebs < vol->used_ebs) { |
| 467 | dbg_err("too small size %d, %d LEBs contain data", |
| 468 | reserved_pebs, vol->used_ebs); |
| 469 | return -EINVAL; |
| 470 | } |
| 471 | |
| 472 | /* If the size is the same, we have nothing to do */ |
| 473 | if (reserved_pebs == vol->reserved_pebs) |
| 474 | return 0; |
| 475 | |
| 476 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); |
| 477 | if (!new_mapping) |
| 478 | return -ENOMEM; |
| 479 | |
| 480 | for (i = 0; i < reserved_pebs; i++) |
| 481 | new_mapping[i] = UBI_LEB_UNMAPPED; |
| 482 | |
| 483 | /* Reserve physical eraseblocks */ |
| 484 | pebs = reserved_pebs - vol->reserved_pebs; |
| 485 | if (pebs > 0) { |
| 486 | spin_lock(&ubi->volumes_lock); |
| 487 | if (pebs > ubi->avail_pebs) { |
| 488 | dbg_err("not enough PEBs: requested %d, available %d", |
| 489 | pebs, ubi->avail_pebs); |
| 490 | spin_unlock(&ubi->volumes_lock); |
| 491 | err = -ENOSPC; |
| 492 | goto out_free; |
| 493 | } |
| 494 | ubi->avail_pebs -= pebs; |
| 495 | ubi->rsvd_pebs += pebs; |
| 496 | for (i = 0; i < vol->reserved_pebs; i++) |
| 497 | new_mapping[i] = vol->eba_tbl[i]; |
| 498 | kfree(vol->eba_tbl); |
| 499 | vol->eba_tbl = new_mapping; |
| 500 | spin_unlock(&ubi->volumes_lock); |
| 501 | } |
| 502 | |
| 503 | /* Change volume table record */ |
| 504 | memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); |
| 505 | vtbl_rec.reserved_pebs = cpu_to_ubi32(reserved_pebs); |
| 506 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
| 507 | if (err) |
| 508 | goto out_acc; |
| 509 | |
| 510 | if (pebs < 0) { |
| 511 | for (i = 0; i < -pebs; i++) { |
| 512 | err = ubi_eba_unmap_leb(ubi, vol_id, reserved_pebs + i); |
| 513 | if (err) |
| 514 | goto out_acc; |
| 515 | } |
| 516 | spin_lock(&ubi->volumes_lock); |
| 517 | ubi->rsvd_pebs += pebs; |
| 518 | ubi->avail_pebs -= pebs; |
| 519 | pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; |
| 520 | if (pebs > 0) { |
| 521 | pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs; |
| 522 | ubi->avail_pebs -= pebs; |
| 523 | ubi->rsvd_pebs += pebs; |
| 524 | ubi->beb_rsvd_pebs += pebs; |
| 525 | if (pebs > 0) |
| 526 | ubi_msg("reserve more %d PEBs", pebs); |
| 527 | } |
| 528 | for (i = 0; i < reserved_pebs; i++) |
| 529 | new_mapping[i] = vol->eba_tbl[i]; |
| 530 | kfree(vol->eba_tbl); |
| 531 | vol->eba_tbl = new_mapping; |
| 532 | spin_unlock(&ubi->volumes_lock); |
| 533 | } |
| 534 | |
| 535 | vol->reserved_pebs = reserved_pebs; |
| 536 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
| 537 | vol->used_ebs = reserved_pebs; |
| 538 | vol->last_eb_bytes = vol->usable_leb_size; |
| 539 | vol->used_bytes = vol->used_ebs * vol->usable_leb_size; |
| 540 | } |
| 541 | |
| 542 | paranoid_check_volumes(ubi); |
| 543 | return 0; |
| 544 | |
| 545 | out_acc: |
| 546 | if (pebs > 0) { |
| 547 | spin_lock(&ubi->volumes_lock); |
| 548 | ubi->rsvd_pebs -= pebs; |
| 549 | ubi->avail_pebs += pebs; |
| 550 | spin_unlock(&ubi->volumes_lock); |
| 551 | } |
| 552 | out_free: |
| 553 | kfree(new_mapping); |
| 554 | return err; |
| 555 | } |
| 556 | |
| 557 | /** |
| 558 | * ubi_add_volume - add volume. |
| 559 | * @ubi: UBI device description object |
| 560 | * @vol_id: volume ID |
| 561 | * |
| 562 | * This function adds an existin volume and initializes all its data |
| 563 | * structures. Returnes zero in case of success and a negative error code in |
| 564 | * case of failure. |
| 565 | */ |
| 566 | int ubi_add_volume(struct ubi_device *ubi, int vol_id) |
| 567 | { |
| 568 | int err; |
| 569 | struct ubi_volume *vol = ubi->volumes[vol_id]; |
| 570 | |
| 571 | dbg_msg("add volume %d", vol_id); |
| 572 | ubi_dbg_dump_vol_info(vol); |
| 573 | ubi_assert(vol); |
| 574 | |
| 575 | /* Register character device for the volume */ |
| 576 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); |
| 577 | vol->cdev.owner = THIS_MODULE; |
| 578 | err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol->vol_id + 1), 1); |
| 579 | if (err) { |
| 580 | ubi_err("cannot add character device for volume %d", vol_id); |
| 581 | return err; |
| 582 | } |
| 583 | |
| 584 | err = ubi_create_gluebi(ubi, vol); |
| 585 | if (err) |
| 586 | goto out_cdev; |
| 587 | |
| 588 | vol->dev.release = vol_release; |
| 589 | vol->dev.parent = &ubi->dev; |
| 590 | vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1); |
| 591 | vol->dev.class = ubi_class; |
| 592 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); |
| 593 | err = device_register(&vol->dev); |
| 594 | if (err) |
| 595 | goto out_gluebi; |
| 596 | |
| 597 | err = volume_sysfs_init(ubi, vol); |
| 598 | if (err) { |
| 599 | cdev_del(&vol->cdev); |
| 600 | err = ubi_destroy_gluebi(vol); |
| 601 | volume_sysfs_close(vol); |
| 602 | return err; |
| 603 | } |
| 604 | |
| 605 | paranoid_check_volumes(ubi); |
| 606 | return 0; |
| 607 | |
| 608 | out_gluebi: |
| 609 | err = ubi_destroy_gluebi(vol); |
| 610 | out_cdev: |
| 611 | cdev_del(&vol->cdev); |
| 612 | return err; |
| 613 | } |
| 614 | |
| 615 | /** |
| 616 | * ubi_free_volume - free volume. |
| 617 | * @ubi: UBI device description object |
| 618 | * @vol_id: volume ID |
| 619 | * |
| 620 | * This function frees all resources for volume @vol_id but does not remove it. |
| 621 | * Used only when the UBI device is detached. |
| 622 | */ |
| 623 | void ubi_free_volume(struct ubi_device *ubi, int vol_id) |
| 624 | { |
| 625 | int err; |
| 626 | struct ubi_volume *vol = ubi->volumes[vol_id]; |
| 627 | |
| 628 | dbg_msg("free volume %d", vol_id); |
| 629 | ubi_assert(vol); |
| 630 | |
| 631 | vol->removed = 1; |
| 632 | err = ubi_destroy_gluebi(vol); |
| 633 | ubi->volumes[vol_id] = NULL; |
| 634 | cdev_del(&vol->cdev); |
| 635 | volume_sysfs_close(vol); |
| 636 | } |
| 637 | |
| 638 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID |
| 639 | |
| 640 | /** |
| 641 | * paranoid_check_volume - check volume information. |
| 642 | * @ubi: UBI device description object |
| 643 | * @vol_id: volume ID |
| 644 | */ |
| 645 | static void paranoid_check_volume(const struct ubi_device *ubi, int vol_id) |
| 646 | { |
| 647 | int idx = vol_id2idx(ubi, vol_id); |
| 648 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; |
| 649 | const struct ubi_volume *vol = ubi->volumes[idx]; |
| 650 | long long n; |
| 651 | const char *name; |
| 652 | |
| 653 | reserved_pebs = ubi32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); |
| 654 | |
| 655 | if (!vol) { |
| 656 | if (reserved_pebs) { |
| 657 | ubi_err("no volume info, but volume exists"); |
| 658 | goto fail; |
| 659 | } |
| 660 | return; |
| 661 | } |
| 662 | |
| 663 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || |
| 664 | vol->name_len < 0) { |
| 665 | ubi_err("negative values"); |
| 666 | goto fail; |
| 667 | } |
| 668 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { |
| 669 | ubi_err("bad alignment"); |
| 670 | goto fail; |
| 671 | } |
| 672 | |
| 673 | n = vol->alignment % ubi->min_io_size; |
| 674 | if (vol->alignment != 1 && n) { |
| 675 | ubi_err("alignment is not multiple of min I/O unit"); |
| 676 | goto fail; |
| 677 | } |
| 678 | |
| 679 | n = ubi->leb_size % vol->alignment; |
| 680 | if (vol->data_pad != n) { |
| 681 | ubi_err("bad data_pad, has to be %lld", n); |
| 682 | goto fail; |
| 683 | } |
| 684 | |
| 685 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && |
| 686 | vol->vol_type != UBI_STATIC_VOLUME) { |
| 687 | ubi_err("bad vol_type"); |
| 688 | goto fail; |
| 689 | } |
| 690 | |
| 691 | if (vol->upd_marker != 0 && vol->upd_marker != 1) { |
| 692 | ubi_err("bad upd_marker"); |
| 693 | goto fail; |
| 694 | } |
| 695 | |
| 696 | if (vol->upd_marker && vol->corrupted) { |
| 697 | dbg_err("update marker and corrupted simultaneously"); |
| 698 | goto fail; |
| 699 | } |
| 700 | |
| 701 | if (vol->reserved_pebs > ubi->good_peb_count) { |
| 702 | ubi_err("too large reserved_pebs"); |
| 703 | goto fail; |
| 704 | } |
| 705 | |
| 706 | n = ubi->leb_size - vol->data_pad; |
| 707 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { |
| 708 | ubi_err("bad usable_leb_size, has to be %lld", n); |
| 709 | goto fail; |
| 710 | } |
| 711 | |
| 712 | if (vol->name_len > UBI_VOL_NAME_MAX) { |
| 713 | ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX); |
| 714 | goto fail; |
| 715 | } |
| 716 | |
| 717 | if (!vol->name) { |
| 718 | ubi_err("NULL volume name"); |
| 719 | goto fail; |
| 720 | } |
| 721 | |
| 722 | n = strnlen(vol->name, vol->name_len + 1); |
| 723 | if (n != vol->name_len) { |
| 724 | ubi_err("bad name_len %lld", n); |
| 725 | goto fail; |
| 726 | } |
| 727 | |
| 728 | n = vol->used_ebs * vol->usable_leb_size; |
| 729 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
| 730 | if (vol->corrupted != 0) { |
| 731 | ubi_err("corrupted dynamic volume"); |
| 732 | goto fail; |
| 733 | } |
| 734 | if (vol->used_ebs != vol->reserved_pebs) { |
| 735 | ubi_err("bad used_ebs"); |
| 736 | goto fail; |
| 737 | } |
| 738 | if (vol->last_eb_bytes != vol->usable_leb_size) { |
| 739 | ubi_err("bad last_eb_bytes"); |
| 740 | goto fail; |
| 741 | } |
| 742 | if (vol->used_bytes != n) { |
| 743 | ubi_err("bad used_bytes"); |
| 744 | goto fail; |
| 745 | } |
| 746 | } else { |
| 747 | if (vol->corrupted != 0 && vol->corrupted != 1) { |
| 748 | ubi_err("bad corrupted"); |
| 749 | goto fail; |
| 750 | } |
| 751 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { |
| 752 | ubi_err("bad used_ebs"); |
| 753 | goto fail; |
| 754 | } |
| 755 | if (vol->last_eb_bytes < 0 || |
| 756 | vol->last_eb_bytes > vol->usable_leb_size) { |
| 757 | ubi_err("bad last_eb_bytes"); |
| 758 | goto fail; |
| 759 | } |
| 760 | if (vol->used_bytes < 0 || vol->used_bytes > n || |
| 761 | vol->used_bytes < n - vol->usable_leb_size) { |
| 762 | ubi_err("bad used_bytes"); |
| 763 | goto fail; |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | alignment = ubi32_to_cpu(ubi->vtbl[vol_id].alignment); |
| 768 | data_pad = ubi32_to_cpu(ubi->vtbl[vol_id].data_pad); |
| 769 | name_len = ubi16_to_cpu(ubi->vtbl[vol_id].name_len); |
| 770 | upd_marker = ubi->vtbl[vol_id].upd_marker; |
| 771 | name = &ubi->vtbl[vol_id].name[0]; |
| 772 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) |
| 773 | vol_type = UBI_DYNAMIC_VOLUME; |
| 774 | else |
| 775 | vol_type = UBI_STATIC_VOLUME; |
| 776 | |
| 777 | if (alignment != vol->alignment || data_pad != vol->data_pad || |
| 778 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || |
| 779 | name_len!= vol->name_len || strncmp(name, vol->name, name_len)) { |
| 780 | ubi_err("volume info is different"); |
| 781 | goto fail; |
| 782 | } |
| 783 | |
| 784 | return; |
| 785 | |
| 786 | fail: |
| 787 | ubi_err("paranoid check failed"); |
| 788 | ubi_dbg_dump_vol_info(vol); |
| 789 | ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); |
| 790 | BUG(); |
| 791 | } |
| 792 | |
| 793 | /** |
| 794 | * paranoid_check_volumes - check information about all volumes. |
| 795 | * @ubi: UBI device description object |
| 796 | */ |
| 797 | static void paranoid_check_volumes(struct ubi_device *ubi) |
| 798 | { |
| 799 | int i; |
| 800 | |
| 801 | mutex_lock(&ubi->vtbl_mutex); |
| 802 | spin_lock(&ubi->volumes_lock); |
| 803 | for (i = 0; i < ubi->vtbl_slots; i++) |
| 804 | paranoid_check_volume(ubi, i); |
| 805 | spin_unlock(&ubi->volumes_lock); |
| 806 | mutex_unlock(&ubi->vtbl_mutex); |
| 807 | } |
| 808 | #endif |