1 /* 2 * Copyright (c) International Business Machines Corp., 2006 3 * Copyright (c) Nokia Corporation, 2006, 2007 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 * 19 * Author: Artem Bityutskiy (Битюцкий Артём) 20 */ 21 22 #ifndef __UBI_UBI_H__ 23 #define __UBI_UBI_H__ 24 25 #include <linux/types.h> 26 #include <linux/list.h> 27 #include <linux/rbtree.h> 28 #include <linux/sched.h> 29 #include <linux/wait.h> 30 #include <linux/mutex.h> 31 #include <linux/rwsem.h> 32 #include <linux/spinlock.h> 33 #include <linux/fs.h> 34 #include <linux/cdev.h> 35 #include <linux/device.h> 36 #include <linux/slab.h> 37 #include <linux/string.h> 38 #include <linux/vmalloc.h> 39 #include <linux/notifier.h> 40 #include <linux/mtd/mtd.h> 41 #include <linux/mtd/ubi.h> 42 #include <asm/pgtable.h> 43 44 #include "ubi-media.h" 45 46 /* Maximum number of supported UBI devices */ 47 #define UBI_MAX_DEVICES 32 48 49 /* UBI name used for character devices, sysfs, etc */ 50 #define UBI_NAME_STR "ubi" 51 52 struct ubi_device; 53 54 /* Normal UBI messages */ 55 __printf(2, 3) 56 void ubi_msg(const struct ubi_device *ubi, const char *fmt, ...); 57 58 /* UBI warning messages */ 59 __printf(2, 3) 60 void ubi_warn(const struct ubi_device *ubi, const char *fmt, ...); 61 62 /* UBI error messages */ 63 __printf(2, 3) 64 void ubi_err(const struct ubi_device *ubi, const char *fmt, ...); 65 66 /* Background thread name pattern */ 67 #define UBI_BGT_NAME_PATTERN "ubi_bgt%dd" 68 69 /* 70 * This marker in the EBA table means that the LEB is um-mapped. 71 * NOTE! It has to have the same value as %UBI_ALL. 72 */ 73 #define UBI_LEB_UNMAPPED -1 74 75 /* 76 * In case of errors, UBI tries to repeat the operation several times before 77 * returning error. The below constant defines how many times UBI re-tries. 78 */ 79 #define UBI_IO_RETRIES 3 80 81 /* 82 * Length of the protection queue. The length is effectively equivalent to the 83 * number of (global) erase cycles PEBs are protected from the wear-leveling 84 * worker. 85 */ 86 #define UBI_PROT_QUEUE_LEN 10 87 88 /* The volume ID/LEB number/erase counter is unknown */ 89 #define UBI_UNKNOWN -1 90 91 /* 92 * The UBI debugfs directory name pattern and maximum name length (3 for "ubi" 93 * + 2 for the number plus 1 for the trailing zero byte. 94 */ 95 #define UBI_DFS_DIR_NAME "ubi%d" 96 #define UBI_DFS_DIR_LEN (3 + 2 + 1) 97 98 /* 99 * Error codes returned by the I/O sub-system. 100 * 101 * UBI_IO_FF: the read region of flash contains only 0xFFs 102 * UBI_IO_FF_BITFLIPS: the same as %UBI_IO_FF, but also also there was a data 103 * integrity error reported by the MTD driver 104 * (uncorrectable ECC error in case of NAND) 105 * UBI_IO_BAD_HDR: the EC or VID header is corrupted (bad magic or CRC) 106 * UBI_IO_BAD_HDR_EBADMSG: the same as %UBI_IO_BAD_HDR, but also there was a 107 * data integrity error reported by the MTD driver 108 * (uncorrectable ECC error in case of NAND) 109 * UBI_IO_BITFLIPS: bit-flips were detected and corrected 110 * 111 * Note, it is probably better to have bit-flip and ebadmsg as flags which can 112 * be or'ed with other error code. But this is a big change because there are 113 * may callers, so it does not worth the risk of introducing a bug 114 */ 115 enum { 116 UBI_IO_FF = 1, 117 UBI_IO_FF_BITFLIPS, 118 UBI_IO_BAD_HDR, 119 UBI_IO_BAD_HDR_EBADMSG, 120 UBI_IO_BITFLIPS, 121 }; 122 123 /* 124 * Return codes of the 'ubi_eba_copy_leb()' function. 125 * 126 * MOVE_CANCEL_RACE: canceled because the volume is being deleted, the source 127 * PEB was put meanwhile, or there is I/O on the source PEB 128 * MOVE_SOURCE_RD_ERR: canceled because there was a read error from the source 129 * PEB 130 * MOVE_TARGET_RD_ERR: canceled because there was a read error from the target 131 * PEB 132 * MOVE_TARGET_WR_ERR: canceled because there was a write error to the target 133 * PEB 134 * MOVE_TARGET_BITFLIPS: canceled because a bit-flip was detected in the 135 * target PEB 136 * MOVE_RETRY: retry scrubbing the PEB 137 */ 138 enum { 139 MOVE_CANCEL_RACE = 1, 140 MOVE_SOURCE_RD_ERR, 141 MOVE_TARGET_RD_ERR, 142 MOVE_TARGET_WR_ERR, 143 MOVE_TARGET_BITFLIPS, 144 MOVE_RETRY, 145 }; 146 147 /* 148 * Return codes of the fastmap sub-system 149 * 150 * UBI_NO_FASTMAP: No fastmap super block was found 151 * UBI_BAD_FASTMAP: A fastmap was found but it's unusable 152 */ 153 enum { 154 UBI_NO_FASTMAP = 1, 155 UBI_BAD_FASTMAP, 156 }; 157 158 /* 159 * Flags for emulate_power_cut in ubi_debug_info 160 * 161 * POWER_CUT_EC_WRITE: Emulate a power cut when writing an EC header 162 * POWER_CUT_VID_WRITE: Emulate a power cut when writing a VID header 163 */ 164 enum { 165 POWER_CUT_EC_WRITE = 0x01, 166 POWER_CUT_VID_WRITE = 0x02, 167 }; 168 169 /** 170 * struct ubi_vid_io_buf - VID buffer used to read/write VID info to/from the 171 * flash. 172 * @hdr: a pointer to the VID header stored in buffer 173 * @buffer: underlying buffer 174 */ 175 struct ubi_vid_io_buf { 176 struct ubi_vid_hdr *hdr; 177 void *buffer; 178 }; 179 180 /** 181 * struct ubi_wl_entry - wear-leveling entry. 182 * @u.rb: link in the corresponding (free/used) RB-tree 183 * @u.list: link in the protection queue 184 * @ec: erase counter 185 * @pnum: physical eraseblock number 186 * 187 * This data structure is used in the WL sub-system. Each physical eraseblock 188 * has a corresponding &struct wl_entry object which may be kept in different 189 * RB-trees. See WL sub-system for details. 190 */ 191 struct ubi_wl_entry { 192 union { 193 struct rb_node rb; 194 struct list_head list; 195 } u; 196 int ec; 197 int pnum; 198 }; 199 200 /** 201 * struct ubi_ltree_entry - an entry in the lock tree. 202 * @rb: links RB-tree nodes 203 * @vol_id: volume ID of the locked logical eraseblock 204 * @lnum: locked logical eraseblock number 205 * @users: how many tasks are using this logical eraseblock or wait for it 206 * @mutex: read/write mutex to implement read/write access serialization to 207 * the (@vol_id, @lnum) logical eraseblock 208 * 209 * This data structure is used in the EBA sub-system to implement per-LEB 210 * locking. When a logical eraseblock is being locked - corresponding 211 * &struct ubi_ltree_entry object is inserted to the lock tree (@ubi->ltree). 212 * See EBA sub-system for details. 213 */ 214 struct ubi_ltree_entry { 215 struct rb_node rb; 216 int vol_id; 217 int lnum; 218 int users; 219 struct rw_semaphore mutex; 220 }; 221 222 /** 223 * struct ubi_rename_entry - volume re-name description data structure. 224 * @new_name_len: new volume name length 225 * @new_name: new volume name 226 * @remove: if not zero, this volume should be removed, not re-named 227 * @desc: descriptor of the volume 228 * @list: links re-name entries into a list 229 * 230 * This data structure is utilized in the multiple volume re-name code. Namely, 231 * UBI first creates a list of &struct ubi_rename_entry objects from the 232 * &struct ubi_rnvol_req request object, and then utilizes this list to do all 233 * the job. 234 */ 235 struct ubi_rename_entry { 236 int new_name_len; 237 char new_name[UBI_VOL_NAME_MAX + 1]; 238 int remove; 239 struct ubi_volume_desc *desc; 240 struct list_head list; 241 }; 242 243 struct ubi_volume_desc; 244 245 /** 246 * struct ubi_fastmap_layout - in-memory fastmap data structure. 247 * @e: PEBs used by the current fastmap 248 * @to_be_tortured: if non-zero tortured this PEB 249 * @used_blocks: number of used PEBs 250 * @max_pool_size: maximal size of the user pool 251 * @max_wl_pool_size: maximal size of the pool used by the WL sub-system 252 */ 253 struct ubi_fastmap_layout { 254 struct ubi_wl_entry *e[UBI_FM_MAX_BLOCKS]; 255 int to_be_tortured[UBI_FM_MAX_BLOCKS]; 256 int used_blocks; 257 int max_pool_size; 258 int max_wl_pool_size; 259 }; 260 261 /** 262 * struct ubi_fm_pool - in-memory fastmap pool 263 * @pebs: PEBs in this pool 264 * @used: number of used PEBs 265 * @size: total number of PEBs in this pool 266 * @max_size: maximal size of the pool 267 * 268 * A pool gets filled with up to max_size. 269 * If all PEBs within the pool are used a new fastmap will be written 270 * to the flash and the pool gets refilled with empty PEBs. 271 * 272 */ 273 struct ubi_fm_pool { 274 int pebs[UBI_FM_MAX_POOL_SIZE]; 275 int used; 276 int size; 277 int max_size; 278 }; 279 280 /** 281 * struct ubi_eba_leb_desc - EBA logical eraseblock descriptor 282 * @lnum: the logical eraseblock number 283 * @pnum: the physical eraseblock where the LEB can be found 284 * 285 * This structure is here to hide EBA's internal from other part of the 286 * UBI implementation. 287 * 288 * One can query the position of a LEB by calling ubi_eba_get_ldesc(). 289 */ 290 struct ubi_eba_leb_desc { 291 int lnum; 292 int pnum; 293 }; 294 295 /** 296 * struct ubi_volume - UBI volume description data structure. 297 * @dev: device object to make use of the the Linux device model 298 * @cdev: character device object to create character device 299 * @ubi: reference to the UBI device description object 300 * @vol_id: volume ID 301 * @ref_count: volume reference count 302 * @readers: number of users holding this volume in read-only mode 303 * @writers: number of users holding this volume in read-write mode 304 * @exclusive: whether somebody holds this volume in exclusive mode 305 * @metaonly: whether somebody is altering only meta data of this volume 306 * 307 * @reserved_pebs: how many physical eraseblocks are reserved for this volume 308 * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME) 309 * @usable_leb_size: logical eraseblock size without padding 310 * @used_ebs: how many logical eraseblocks in this volume contain data 311 * @last_eb_bytes: how many bytes are stored in the last logical eraseblock 312 * @used_bytes: how many bytes of data this volume contains 313 * @alignment: volume alignment 314 * @data_pad: how many bytes are not used at the end of physical eraseblocks to 315 * satisfy the requested alignment 316 * @name_len: volume name length 317 * @name: volume name 318 * 319 * @upd_ebs: how many eraseblocks are expected to be updated 320 * @ch_lnum: LEB number which is being changing by the atomic LEB change 321 * operation 322 * @upd_bytes: how many bytes are expected to be received for volume update or 323 * atomic LEB change 324 * @upd_received: how many bytes were already received for volume update or 325 * atomic LEB change 326 * @upd_buf: update buffer which is used to collect update data or data for 327 * atomic LEB change 328 * 329 * @eba_tbl: EBA table of this volume (LEB->PEB mapping) 330 * @checked: %1 if this static volume was checked 331 * @corrupted: %1 if the volume is corrupted (static volumes only) 332 * @upd_marker: %1 if the update marker is set for this volume 333 * @updating: %1 if the volume is being updated 334 * @changing_leb: %1 if the atomic LEB change ioctl command is in progress 335 * @direct_writes: %1 if direct writes are enabled for this volume 336 * 337 * The @corrupted field indicates that the volume's contents is corrupted. 338 * Since UBI protects only static volumes, this field is not relevant to 339 * dynamic volumes - it is user's responsibility to assure their data 340 * integrity. 341 * 342 * The @upd_marker flag indicates that this volume is either being updated at 343 * the moment or is damaged because of an unclean reboot. 344 */ 345 struct ubi_volume { 346 struct device dev; 347 struct cdev cdev; 348 struct ubi_device *ubi; 349 int vol_id; 350 int ref_count; 351 int readers; 352 int writers; 353 int exclusive; 354 int metaonly; 355 356 int reserved_pebs; 357 int vol_type; 358 int usable_leb_size; 359 int used_ebs; 360 int last_eb_bytes; 361 long long used_bytes; 362 int alignment; 363 int data_pad; 364 int name_len; 365 char name[UBI_VOL_NAME_MAX + 1]; 366 367 int upd_ebs; 368 int ch_lnum; 369 long long upd_bytes; 370 long long upd_received; 371 void *upd_buf; 372 373 struct ubi_eba_table *eba_tbl; 374 unsigned int checked:1; 375 unsigned int corrupted:1; 376 unsigned int upd_marker:1; 377 unsigned int updating:1; 378 unsigned int changing_leb:1; 379 unsigned int direct_writes:1; 380 }; 381 382 /** 383 * struct ubi_volume_desc - UBI volume descriptor returned when it is opened. 384 * @vol: reference to the corresponding volume description object 385 * @mode: open mode (%UBI_READONLY, %UBI_READWRITE, %UBI_EXCLUSIVE 386 * or %UBI_METAONLY) 387 */ 388 struct ubi_volume_desc { 389 struct ubi_volume *vol; 390 int mode; 391 }; 392 393 struct ubi_wl_entry; 394 395 /** 396 * struct ubi_debug_info - debugging information for an UBI device. 397 * 398 * @chk_gen: if UBI general extra checks are enabled 399 * @chk_io: if UBI I/O extra checks are enabled 400 * @chk_fastmap: if UBI fastmap extra checks are enabled 401 * @disable_bgt: disable the background task for testing purposes 402 * @emulate_bitflips: emulate bit-flips for testing purposes 403 * @emulate_io_failures: emulate write/erase failures for testing purposes 404 * @emulate_power_cut: emulate power cut for testing purposes 405 * @power_cut_counter: count down for writes left until emulated power cut 406 * @power_cut_min: minimum number of writes before emulating a power cut 407 * @power_cut_max: maximum number of writes until emulating a power cut 408 * @dfs_dir_name: name of debugfs directory containing files of this UBI device 409 * @dfs_dir: direntry object of the UBI device debugfs directory 410 * @dfs_chk_gen: debugfs knob to enable UBI general extra checks 411 * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks 412 * @dfs_chk_fastmap: debugfs knob to enable UBI fastmap extra checks 413 * @dfs_disable_bgt: debugfs knob to disable the background task 414 * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips 415 * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures 416 * @dfs_emulate_power_cut: debugfs knob to emulate power cuts 417 * @dfs_power_cut_min: debugfs knob for minimum writes before power cut 418 * @dfs_power_cut_max: debugfs knob for maximum writes until power cut 419 */ 420 struct ubi_debug_info { 421 unsigned int chk_gen:1; 422 unsigned int chk_io:1; 423 unsigned int chk_fastmap:1; 424 unsigned int disable_bgt:1; 425 unsigned int emulate_bitflips:1; 426 unsigned int emulate_io_failures:1; 427 unsigned int emulate_power_cut:2; 428 unsigned int power_cut_counter; 429 unsigned int power_cut_min; 430 unsigned int power_cut_max; 431 char dfs_dir_name[UBI_DFS_DIR_LEN + 1]; 432 struct dentry *dfs_dir; 433 struct dentry *dfs_chk_gen; 434 struct dentry *dfs_chk_io; 435 struct dentry *dfs_chk_fastmap; 436 struct dentry *dfs_disable_bgt; 437 struct dentry *dfs_emulate_bitflips; 438 struct dentry *dfs_emulate_io_failures; 439 struct dentry *dfs_emulate_power_cut; 440 struct dentry *dfs_power_cut_min; 441 struct dentry *dfs_power_cut_max; 442 }; 443 444 /** 445 * struct ubi_device - UBI device description structure 446 * @dev: UBI device object to use the the Linux device model 447 * @cdev: character device object to create character device 448 * @ubi_num: UBI device number 449 * @ubi_name: UBI device name 450 * @vol_count: number of volumes in this UBI device 451 * @volumes: volumes of this UBI device 452 * @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs, 453 * @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count, 454 * @vol->readers, @vol->writers, @vol->exclusive, 455 * @vol->metaonly, @vol->ref_count, @vol->mapping and 456 * @vol->eba_tbl. 457 * @ref_count: count of references on the UBI device 458 * @image_seq: image sequence number recorded on EC headers 459 * 460 * @rsvd_pebs: count of reserved physical eraseblocks 461 * @avail_pebs: count of available physical eraseblocks 462 * @beb_rsvd_pebs: how many physical eraseblocks are reserved for bad PEB 463 * handling 464 * @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling 465 * 466 * @autoresize_vol_id: ID of the volume which has to be auto-resized at the end 467 * of UBI initialization 468 * @vtbl_slots: how many slots are available in the volume table 469 * @vtbl_size: size of the volume table in bytes 470 * @vtbl: in-RAM volume table copy 471 * @device_mutex: protects on-flash volume table and serializes volume 472 * creation, deletion, update, re-size, re-name and set 473 * property 474 * 475 * @max_ec: current highest erase counter value 476 * @mean_ec: current mean erase counter value 477 * 478 * @global_sqnum: global sequence number 479 * @ltree_lock: protects the lock tree and @global_sqnum 480 * @ltree: the lock tree 481 * @alc_mutex: serializes "atomic LEB change" operations 482 * 483 * @fm_disabled: non-zero if fastmap is disabled (default) 484 * @fm: in-memory data structure of the currently used fastmap 485 * @fm_pool: in-memory data structure of the fastmap pool 486 * @fm_wl_pool: in-memory data structure of the fastmap pool used by the WL 487 * sub-system 488 * @fm_protect: serializes ubi_update_fastmap(), protects @fm_buf and makes sure 489 * that critical sections cannot be interrupted by ubi_update_fastmap() 490 * @fm_buf: vmalloc()'d buffer which holds the raw fastmap 491 * @fm_size: fastmap size in bytes 492 * @fm_eba_sem: allows ubi_update_fastmap() to block EBA table changes 493 * @fm_work: fastmap work queue 494 * @fm_work_scheduled: non-zero if fastmap work was scheduled 495 * @fast_attach: non-zero if UBI was attached by fastmap 496 * 497 * @used: RB-tree of used physical eraseblocks 498 * @erroneous: RB-tree of erroneous used physical eraseblocks 499 * @free: RB-tree of free physical eraseblocks 500 * @free_count: Contains the number of elements in @free 501 * @scrub: RB-tree of physical eraseblocks which need scrubbing 502 * @pq: protection queue (contain physical eraseblocks which are temporarily 503 * protected from the wear-leveling worker) 504 * @pq_head: protection queue head 505 * @wl_lock: protects the @used, @free, @pq, @pq_head, @lookuptbl, @move_from, 506 * @move_to, @move_to_put @erase_pending, @wl_scheduled, @works, 507 * @erroneous, @erroneous_peb_count, @fm_work_scheduled, @fm_pool, 508 * and @fm_wl_pool fields 509 * @move_mutex: serializes eraseblock moves 510 * @work_sem: used to wait for all the scheduled works to finish and prevent 511 * new works from being submitted 512 * @wl_scheduled: non-zero if the wear-leveling was scheduled 513 * @lookuptbl: a table to quickly find a &struct ubi_wl_entry object for any 514 * physical eraseblock 515 * @move_from: physical eraseblock from where the data is being moved 516 * @move_to: physical eraseblock where the data is being moved to 517 * @move_to_put: if the "to" PEB was put 518 * @works: list of pending works 519 * @works_count: count of pending works 520 * @bgt_thread: background thread description object 521 * @thread_enabled: if the background thread is enabled 522 * @bgt_name: background thread name 523 * 524 * @flash_size: underlying MTD device size (in bytes) 525 * @peb_count: count of physical eraseblocks on the MTD device 526 * @peb_size: physical eraseblock size 527 * @bad_peb_limit: top limit of expected bad physical eraseblocks 528 * @bad_peb_count: count of bad physical eraseblocks 529 * @good_peb_count: count of good physical eraseblocks 530 * @corr_peb_count: count of corrupted physical eraseblocks (preserved and not 531 * used by UBI) 532 * @erroneous_peb_count: count of erroneous physical eraseblocks in @erroneous 533 * @max_erroneous: maximum allowed amount of erroneous physical eraseblocks 534 * @min_io_size: minimal input/output unit size of the underlying MTD device 535 * @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers 536 * @ro_mode: if the UBI device is in read-only mode 537 * @leb_size: logical eraseblock size 538 * @leb_start: starting offset of logical eraseblocks within physical 539 * eraseblocks 540 * @ec_hdr_alsize: size of the EC header aligned to @hdrs_min_io_size 541 * @vid_hdr_alsize: size of the VID header aligned to @hdrs_min_io_size 542 * @vid_hdr_offset: starting offset of the volume identifier header (might be 543 * unaligned) 544 * @vid_hdr_aloffset: starting offset of the VID header aligned to 545 * @hdrs_min_io_size 546 * @vid_hdr_shift: contains @vid_hdr_offset - @vid_hdr_aloffset 547 * @bad_allowed: whether the MTD device admits of bad physical eraseblocks or 548 * not 549 * @nor_flash: non-zero if working on top of NOR flash 550 * @max_write_size: maximum amount of bytes the underlying flash can write at a 551 * time (MTD write buffer size) 552 * @mtd: MTD device descriptor 553 * 554 * @peb_buf: a buffer of PEB size used for different purposes 555 * @buf_mutex: protects @peb_buf 556 * @ckvol_mutex: serializes static volume checking when opening 557 * 558 * @dbg: debugging information for this UBI device 559 */ 560 struct ubi_device { 561 struct cdev cdev; 562 struct device dev; 563 int ubi_num; 564 char ubi_name[sizeof(UBI_NAME_STR)+5]; 565 int vol_count; 566 struct ubi_volume *volumes[UBI_MAX_VOLUMES+UBI_INT_VOL_COUNT]; 567 spinlock_t volumes_lock; 568 int ref_count; 569 int image_seq; 570 571 int rsvd_pebs; 572 int avail_pebs; 573 int beb_rsvd_pebs; 574 int beb_rsvd_level; 575 int bad_peb_limit; 576 577 int autoresize_vol_id; 578 int vtbl_slots; 579 int vtbl_size; 580 struct ubi_vtbl_record *vtbl; 581 struct mutex device_mutex; 582 583 int max_ec; 584 /* Note, mean_ec is not updated run-time - should be fixed */ 585 int mean_ec; 586 587 /* EBA sub-system's stuff */ 588 unsigned long long global_sqnum; 589 spinlock_t ltree_lock; 590 struct rb_root ltree; 591 struct mutex alc_mutex; 592 593 /* Fastmap stuff */ 594 int fm_disabled; 595 struct ubi_fastmap_layout *fm; 596 struct ubi_fm_pool fm_pool; 597 struct ubi_fm_pool fm_wl_pool; 598 struct rw_semaphore fm_eba_sem; 599 struct rw_semaphore fm_protect; 600 void *fm_buf; 601 size_t fm_size; 602 struct work_struct fm_work; 603 int fm_work_scheduled; 604 int fast_attach; 605 606 /* Wear-leveling sub-system's stuff */ 607 struct rb_root used; 608 struct rb_root erroneous; 609 struct rb_root free; 610 int free_count; 611 struct rb_root scrub; 612 struct list_head pq[UBI_PROT_QUEUE_LEN]; 613 int pq_head; 614 spinlock_t wl_lock; 615 struct mutex move_mutex; 616 struct rw_semaphore work_sem; 617 int wl_scheduled; 618 struct ubi_wl_entry **lookuptbl; 619 struct ubi_wl_entry *move_from; 620 struct ubi_wl_entry *move_to; 621 int move_to_put; 622 struct list_head works; 623 int works_count; 624 struct task_struct *bgt_thread; 625 int thread_enabled; 626 char bgt_name[sizeof(UBI_BGT_NAME_PATTERN)+2]; 627 628 /* I/O sub-system's stuff */ 629 long long flash_size; 630 int peb_count; 631 int peb_size; 632 int bad_peb_count; 633 int good_peb_count; 634 int corr_peb_count; 635 int erroneous_peb_count; 636 int max_erroneous; 637 int min_io_size; 638 int hdrs_min_io_size; 639 int ro_mode; 640 int leb_size; 641 int leb_start; 642 int ec_hdr_alsize; 643 int vid_hdr_alsize; 644 int vid_hdr_offset; 645 int vid_hdr_aloffset; 646 int vid_hdr_shift; 647 unsigned int bad_allowed:1; 648 unsigned int nor_flash:1; 649 int max_write_size; 650 struct mtd_info *mtd; 651 652 void *peb_buf; 653 struct mutex buf_mutex; 654 struct mutex ckvol_mutex; 655 656 struct ubi_debug_info dbg; 657 }; 658 659 /** 660 * struct ubi_ainf_peb - attach information about a physical eraseblock. 661 * @ec: erase counter (%UBI_UNKNOWN if it is unknown) 662 * @pnum: physical eraseblock number 663 * @vol_id: ID of the volume this LEB belongs to 664 * @lnum: logical eraseblock number 665 * @scrub: if this physical eraseblock needs scrubbing 666 * @copy_flag: this LEB is a copy (@copy_flag is set in VID header of this LEB) 667 * @sqnum: sequence number 668 * @u: unions RB-tree or @list links 669 * @u.rb: link in the per-volume RB-tree of &struct ubi_ainf_peb objects 670 * @u.list: link in one of the eraseblock lists 671 * 672 * One object of this type is allocated for each physical eraseblock when 673 * attaching an MTD device. Note, if this PEB does not belong to any LEB / 674 * volume, the @vol_id and @lnum fields are initialized to %UBI_UNKNOWN. 675 */ 676 struct ubi_ainf_peb { 677 int ec; 678 int pnum; 679 int vol_id; 680 int lnum; 681 unsigned int scrub:1; 682 unsigned int copy_flag:1; 683 unsigned long long sqnum; 684 union { 685 struct rb_node rb; 686 struct list_head list; 687 } u; 688 }; 689 690 /** 691 * struct ubi_ainf_volume - attaching information about a volume. 692 * @vol_id: volume ID 693 * @highest_lnum: highest logical eraseblock number in this volume 694 * @leb_count: number of logical eraseblocks in this volume 695 * @vol_type: volume type 696 * @used_ebs: number of used logical eraseblocks in this volume (only for 697 * static volumes) 698 * @last_data_size: amount of data in the last logical eraseblock of this 699 * volume (always equivalent to the usable logical eraseblock 700 * size in case of dynamic volumes) 701 * @data_pad: how many bytes at the end of logical eraseblocks of this volume 702 * are not used (due to volume alignment) 703 * @compat: compatibility flags of this volume 704 * @rb: link in the volume RB-tree 705 * @root: root of the RB-tree containing all the eraseblock belonging to this 706 * volume (&struct ubi_ainf_peb objects) 707 * 708 * One object of this type is allocated for each volume when attaching an MTD 709 * device. 710 */ 711 struct ubi_ainf_volume { 712 int vol_id; 713 int highest_lnum; 714 int leb_count; 715 int vol_type; 716 int used_ebs; 717 int last_data_size; 718 int data_pad; 719 int compat; 720 struct rb_node rb; 721 struct rb_root root; 722 }; 723 724 /** 725 * struct ubi_attach_info - MTD device attaching information. 726 * @volumes: root of the volume RB-tree 727 * @corr: list of corrupted physical eraseblocks 728 * @free: list of free physical eraseblocks 729 * @erase: list of physical eraseblocks which have to be erased 730 * @alien: list of physical eraseblocks which should not be used by UBI (e.g., 731 * those belonging to "preserve"-compatible internal volumes) 732 * @fastmap: list of physical eraseblocks which relate to fastmap (e.g., 733 * eraseblocks of the current and not yet erased old fastmap blocks) 734 * @corr_peb_count: count of PEBs in the @corr list 735 * @empty_peb_count: count of PEBs which are presumably empty (contain only 736 * 0xFF bytes) 737 * @alien_peb_count: count of PEBs in the @alien list 738 * @bad_peb_count: count of bad physical eraseblocks 739 * @maybe_bad_peb_count: count of bad physical eraseblocks which are not marked 740 * as bad yet, but which look like bad 741 * @vols_found: number of volumes found 742 * @highest_vol_id: highest volume ID 743 * @is_empty: flag indicating whether the MTD device is empty or not 744 * @force_full_scan: flag indicating whether we need to do a full scan and drop 745 all existing Fastmap data structures 746 * @min_ec: lowest erase counter value 747 * @max_ec: highest erase counter value 748 * @max_sqnum: highest sequence number value 749 * @mean_ec: mean erase counter value 750 * @ec_sum: a temporary variable used when calculating @mean_ec 751 * @ec_count: a temporary variable used when calculating @mean_ec 752 * @aeb_slab_cache: slab cache for &struct ubi_ainf_peb objects 753 * @ech: temporary EC header. Only available during scan 754 * @vidh: temporary VID buffer. Only available during scan 755 * 756 * This data structure contains the result of attaching an MTD device and may 757 * be used by other UBI sub-systems to build final UBI data structures, further 758 * error-recovery and so on. 759 */ 760 struct ubi_attach_info { 761 struct rb_root volumes; 762 struct list_head corr; 763 struct list_head free; 764 struct list_head erase; 765 struct list_head alien; 766 struct list_head fastmap; 767 int corr_peb_count; 768 int empty_peb_count; 769 int alien_peb_count; 770 int bad_peb_count; 771 int maybe_bad_peb_count; 772 int vols_found; 773 int highest_vol_id; 774 int is_empty; 775 int force_full_scan; 776 int min_ec; 777 int max_ec; 778 unsigned long long max_sqnum; 779 int mean_ec; 780 uint64_t ec_sum; 781 int ec_count; 782 struct kmem_cache *aeb_slab_cache; 783 struct ubi_ec_hdr *ech; 784 struct ubi_vid_io_buf *vidb; 785 }; 786 787 /** 788 * struct ubi_work - UBI work description data structure. 789 * @list: a link in the list of pending works 790 * @func: worker function 791 * @e: physical eraseblock to erase 792 * @vol_id: the volume ID on which this erasure is being performed 793 * @lnum: the logical eraseblock number 794 * @torture: if the physical eraseblock has to be tortured 795 * @anchor: produce a anchor PEB to by used by fastmap 796 * 797 * The @func pointer points to the worker function. If the @shutdown argument is 798 * not zero, the worker has to free the resources and exit immediately as the 799 * WL sub-system is shutting down. 800 * The worker has to return zero in case of success and a negative error code in 801 * case of failure. 802 */ 803 struct ubi_work { 804 struct list_head list; 805 int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int shutdown); 806 /* The below fields are only relevant to erasure works */ 807 struct ubi_wl_entry *e; 808 int vol_id; 809 int lnum; 810 int torture; 811 int anchor; 812 }; 813 814 #include "debug.h" 815 816 extern struct kmem_cache *ubi_wl_entry_slab; 817 extern const struct file_operations ubi_ctrl_cdev_operations; 818 extern const struct file_operations ubi_cdev_operations; 819 extern const struct file_operations ubi_vol_cdev_operations; 820 extern struct class ubi_class; 821 extern struct mutex ubi_devices_mutex; 822 extern struct blocking_notifier_head ubi_notifiers; 823 824 /* attach.c */ 825 struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum, 826 int ec); 827 void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb); 828 int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum, 829 int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips); 830 struct ubi_ainf_volume *ubi_add_av(struct ubi_attach_info *ai, int vol_id); 831 struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai, 832 int vol_id); 833 void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av); 834 struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi, 835 struct ubi_attach_info *ai); 836 int ubi_attach(struct ubi_device *ubi, int force_scan); 837 void ubi_destroy_ai(struct ubi_attach_info *ai); 838 839 /* vtbl.c */ 840 int ubi_change_vtbl_record(struct ubi_device *ubi, int idx, 841 struct ubi_vtbl_record *vtbl_rec); 842 int ubi_vtbl_rename_volumes(struct ubi_device *ubi, 843 struct list_head *rename_list); 844 int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai); 845 846 /* vmt.c */ 847 int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req); 848 int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl); 849 int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs); 850 int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list); 851 int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol); 852 void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol); 853 854 /* upd.c */ 855 int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol, 856 long long bytes); 857 int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol, 858 const void __user *buf, int count); 859 int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, 860 const struct ubi_leb_change_req *req); 861 int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol, 862 const void __user *buf, int count); 863 864 /* misc.c */ 865 int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf, 866 int length); 867 int ubi_check_volume(struct ubi_device *ubi, int vol_id); 868 void ubi_update_reserved(struct ubi_device *ubi); 869 void ubi_calculate_reserved(struct ubi_device *ubi); 870 int ubi_check_pattern(const void *buf, uint8_t patt, int size); 871 872 static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum) 873 { 874 return lnum >= 0 && lnum < vol->reserved_pebs; 875 } 876 877 /* eba.c */ 878 struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol, 879 int nentries); 880 void ubi_eba_destroy_table(struct ubi_eba_table *tbl); 881 void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst, 882 int nentries); 883 void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl); 884 void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum, 885 struct ubi_eba_leb_desc *ldesc); 886 bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum); 887 int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, 888 int lnum); 889 int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, 890 void *buf, int offset, int len, int check); 891 int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol, 892 struct ubi_sgl *sgl, int lnum, int offset, int len, 893 int check); 894 int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, 895 const void *buf, int offset, int len); 896 int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, 897 int lnum, const void *buf, int len, int used_ebs); 898 int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, 899 int lnum, const void *buf, int len); 900 int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, 901 struct ubi_vid_io_buf *vidb); 902 int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai); 903 unsigned long long ubi_next_sqnum(struct ubi_device *ubi); 904 int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap, 905 struct ubi_attach_info *ai_scan); 906 907 /* wl.c */ 908 int ubi_wl_get_peb(struct ubi_device *ubi); 909 int ubi_wl_put_peb(struct ubi_device *ubi, int vol_id, int lnum, 910 int pnum, int torture); 911 int ubi_wl_flush(struct ubi_device *ubi, int vol_id, int lnum); 912 int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum); 913 int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai); 914 void ubi_wl_close(struct ubi_device *ubi); 915 int ubi_thread(void *u); 916 struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor); 917 int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *used_e, 918 int lnum, int torture); 919 int ubi_is_erase_work(struct ubi_work *wrk); 920 void ubi_refill_pools(struct ubi_device *ubi); 921 int ubi_ensure_anchor_pebs(struct ubi_device *ubi); 922 923 /* io.c */ 924 int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset, 925 int len); 926 int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset, 927 int len); 928 int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture); 929 int ubi_io_is_bad(const struct ubi_device *ubi, int pnum); 930 int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum); 931 int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, 932 struct ubi_ec_hdr *ec_hdr, int verbose); 933 int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum, 934 struct ubi_ec_hdr *ec_hdr); 935 int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, 936 struct ubi_vid_io_buf *vidb, int verbose); 937 int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, 938 struct ubi_vid_io_buf *vidb); 939 940 /* build.c */ 941 int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, 942 int vid_hdr_offset, int max_beb_per1024); 943 int ubi_detach_mtd_dev(int ubi_num, int anyway); 944 struct ubi_device *ubi_get_device(int ubi_num); 945 void ubi_put_device(struct ubi_device *ubi); 946 struct ubi_device *ubi_get_by_major(int major); 947 int ubi_major2num(int major); 948 int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, 949 int ntype); 950 int ubi_notify_all(struct ubi_device *ubi, int ntype, 951 struct notifier_block *nb); 952 int ubi_enumerate_volumes(struct notifier_block *nb); 953 void ubi_free_internal_volumes(struct ubi_device *ubi); 954 955 /* kapi.c */ 956 void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di); 957 void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol, 958 struct ubi_volume_info *vi); 959 /* scan.c */ 960 int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb, 961 int pnum, const struct ubi_vid_hdr *vid_hdr); 962 963 /* fastmap.c */ 964 #ifdef CONFIG_MTD_UBI_FASTMAP 965 size_t ubi_calc_fm_size(struct ubi_device *ubi); 966 int ubi_update_fastmap(struct ubi_device *ubi); 967 int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai, 968 struct ubi_attach_info *scan_ai); 969 #else 970 static inline int ubi_update_fastmap(struct ubi_device *ubi) { return 0; } 971 #endif 972 973 /* block.c */ 974 #ifdef CONFIG_MTD_UBI_BLOCK 975 int ubiblock_init(void); 976 void ubiblock_exit(void); 977 int ubiblock_create(struct ubi_volume_info *vi); 978 int ubiblock_remove(struct ubi_volume_info *vi); 979 #else 980 static inline int ubiblock_init(void) { return 0; } 981 static inline void ubiblock_exit(void) {} 982 static inline int ubiblock_create(struct ubi_volume_info *vi) 983 { 984 return -ENOSYS; 985 } 986 static inline int ubiblock_remove(struct ubi_volume_info *vi) 987 { 988 return -ENOSYS; 989 } 990 #endif 991 992 /* 993 * ubi_for_each_free_peb - walk the UBI free RB tree. 994 * @ubi: UBI device description object 995 * @e: a pointer to a ubi_wl_entry to use as cursor 996 * @pos: a pointer to RB-tree entry type to use as a loop counter 997 */ 998 #define ubi_for_each_free_peb(ubi, e, tmp_rb) \ 999 ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->free, u.rb) 1000 1001 /* 1002 * ubi_for_each_used_peb - walk the UBI used RB tree. 1003 * @ubi: UBI device description object 1004 * @e: a pointer to a ubi_wl_entry to use as cursor 1005 * @pos: a pointer to RB-tree entry type to use as a loop counter 1006 */ 1007 #define ubi_for_each_used_peb(ubi, e, tmp_rb) \ 1008 ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->used, u.rb) 1009 1010 /* 1011 * ubi_for_each_scub_peb - walk the UBI scub RB tree. 1012 * @ubi: UBI device description object 1013 * @e: a pointer to a ubi_wl_entry to use as cursor 1014 * @pos: a pointer to RB-tree entry type to use as a loop counter 1015 */ 1016 #define ubi_for_each_scrub_peb(ubi, e, tmp_rb) \ 1017 ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->scrub, u.rb) 1018 1019 /* 1020 * ubi_for_each_protected_peb - walk the UBI protection queue. 1021 * @ubi: UBI device description object 1022 * @i: a integer used as counter 1023 * @e: a pointer to a ubi_wl_entry to use as cursor 1024 */ 1025 #define ubi_for_each_protected_peb(ubi, i, e) \ 1026 for ((i) = 0; (i) < UBI_PROT_QUEUE_LEN; (i)++) \ 1027 list_for_each_entry((e), &(ubi->pq[(i)]), u.list) 1028 1029 /* 1030 * ubi_rb_for_each_entry - walk an RB-tree. 1031 * @rb: a pointer to type 'struct rb_node' to use as a loop counter 1032 * @pos: a pointer to RB-tree entry type to use as a loop counter 1033 * @root: RB-tree's root 1034 * @member: the name of the 'struct rb_node' within the RB-tree entry 1035 */ 1036 #define ubi_rb_for_each_entry(rb, pos, root, member) \ 1037 for (rb = rb_first(root), \ 1038 pos = (rb ? container_of(rb, typeof(*pos), member) : NULL); \ 1039 rb; \ 1040 rb = rb_next(rb), \ 1041 pos = (rb ? container_of(rb, typeof(*pos), member) : NULL)) 1042 1043 /* 1044 * ubi_move_aeb_to_list - move a PEB from the volume tree to a list. 1045 * 1046 * @av: volume attaching information 1047 * @aeb: attaching eraseblock information 1048 * @list: the list to move to 1049 */ 1050 static inline void ubi_move_aeb_to_list(struct ubi_ainf_volume *av, 1051 struct ubi_ainf_peb *aeb, 1052 struct list_head *list) 1053 { 1054 rb_erase(&aeb->u.rb, &av->root); 1055 list_add_tail(&aeb->u.list, list); 1056 } 1057 1058 /** 1059 * ubi_init_vid_buf - Initialize a VID buffer 1060 * @ubi: the UBI device 1061 * @vidb: the VID buffer to initialize 1062 * @buf: the underlying buffer 1063 */ 1064 static inline void ubi_init_vid_buf(const struct ubi_device *ubi, 1065 struct ubi_vid_io_buf *vidb, 1066 void *buf) 1067 { 1068 if (buf) 1069 memset(buf, 0, ubi->vid_hdr_alsize); 1070 1071 vidb->buffer = buf; 1072 vidb->hdr = buf + ubi->vid_hdr_shift; 1073 } 1074 1075 /** 1076 * ubi_init_vid_buf - Allocate a VID buffer 1077 * @ubi: the UBI device 1078 * @gfp_flags: GFP flags to use for the allocation 1079 */ 1080 static inline struct ubi_vid_io_buf * 1081 ubi_alloc_vid_buf(const struct ubi_device *ubi, gfp_t gfp_flags) 1082 { 1083 struct ubi_vid_io_buf *vidb; 1084 void *buf; 1085 1086 vidb = kzalloc(sizeof(*vidb), gfp_flags); 1087 if (!vidb) 1088 return NULL; 1089 1090 buf = kmalloc(ubi->vid_hdr_alsize, gfp_flags); 1091 if (!buf) { 1092 kfree(vidb); 1093 return NULL; 1094 } 1095 1096 ubi_init_vid_buf(ubi, vidb, buf); 1097 1098 return vidb; 1099 } 1100 1101 /** 1102 * ubi_free_vid_buf - Free a VID buffer 1103 * @vidb: the VID buffer to free 1104 */ 1105 static inline void ubi_free_vid_buf(struct ubi_vid_io_buf *vidb) 1106 { 1107 if (!vidb) 1108 return; 1109 1110 kfree(vidb->buffer); 1111 kfree(vidb); 1112 } 1113 1114 /** 1115 * ubi_get_vid_hdr - Get the VID header attached to a VID buffer 1116 * @vidb: VID buffer 1117 */ 1118 static inline struct ubi_vid_hdr *ubi_get_vid_hdr(struct ubi_vid_io_buf *vidb) 1119 { 1120 return vidb->hdr; 1121 } 1122 1123 /* 1124 * This function is equivalent to 'ubi_io_read()', but @offset is relative to 1125 * the beginning of the logical eraseblock, not to the beginning of the 1126 * physical eraseblock. 1127 */ 1128 static inline int ubi_io_read_data(const struct ubi_device *ubi, void *buf, 1129 int pnum, int offset, int len) 1130 { 1131 ubi_assert(offset >= 0); 1132 return ubi_io_read(ubi, buf, pnum, offset + ubi->leb_start, len); 1133 } 1134 1135 /* 1136 * This function is equivalent to 'ubi_io_write()', but @offset is relative to 1137 * the beginning of the logical eraseblock, not to the beginning of the 1138 * physical eraseblock. 1139 */ 1140 static inline int ubi_io_write_data(struct ubi_device *ubi, const void *buf, 1141 int pnum, int offset, int len) 1142 { 1143 ubi_assert(offset >= 0); 1144 return ubi_io_write(ubi, buf, pnum, offset + ubi->leb_start, len); 1145 } 1146 1147 /** 1148 * ubi_ro_mode - switch to read-only mode. 1149 * @ubi: UBI device description object 1150 */ 1151 static inline void ubi_ro_mode(struct ubi_device *ubi) 1152 { 1153 if (!ubi->ro_mode) { 1154 ubi->ro_mode = 1; 1155 ubi_warn(ubi, "switch to read-only mode"); 1156 dump_stack(); 1157 } 1158 } 1159 1160 /** 1161 * vol_id2idx - get table index by volume ID. 1162 * @ubi: UBI device description object 1163 * @vol_id: volume ID 1164 */ 1165 static inline int vol_id2idx(const struct ubi_device *ubi, int vol_id) 1166 { 1167 if (vol_id >= UBI_INTERNAL_VOL_START) 1168 return vol_id - UBI_INTERNAL_VOL_START + ubi->vtbl_slots; 1169 else 1170 return vol_id; 1171 } 1172 1173 /** 1174 * idx2vol_id - get volume ID by table index. 1175 * @ubi: UBI device description object 1176 * @idx: table index 1177 */ 1178 static inline int idx2vol_id(const struct ubi_device *ubi, int idx) 1179 { 1180 if (idx >= ubi->vtbl_slots) 1181 return idx - ubi->vtbl_slots + UBI_INTERNAL_VOL_START; 1182 else 1183 return idx; 1184 } 1185 1186 /** 1187 * ubi_is_fm_vol - check whether a volume ID is a Fastmap volume. 1188 * @vol_id: volume ID 1189 */ 1190 static inline bool ubi_is_fm_vol(int vol_id) 1191 { 1192 switch (vol_id) { 1193 case UBI_FM_SB_VOLUME_ID: 1194 case UBI_FM_DATA_VOLUME_ID: 1195 return true; 1196 } 1197 1198 return false; 1199 } 1200 1201 /** 1202 * ubi_find_fm_block - check whether a PEB is part of the current Fastmap. 1203 * @ubi: UBI device description object 1204 * @pnum: physical eraseblock to look for 1205 * 1206 * This function returns a wear leveling object if @pnum relates to the current 1207 * fastmap, @NULL otherwise. 1208 */ 1209 static inline struct ubi_wl_entry *ubi_find_fm_block(const struct ubi_device *ubi, 1210 int pnum) 1211 { 1212 int i; 1213 1214 if (ubi->fm) { 1215 for (i = 0; i < ubi->fm->used_blocks; i++) { 1216 if (ubi->fm->e[i]->pnum == pnum) 1217 return ubi->fm->e[i]; 1218 } 1219 } 1220 1221 return NULL; 1222 } 1223 1224 #endif /* !__UBI_UBI_H__ */ 1225