1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (c) International Business Machines Corp., 2006 4 * Copyright (c) Nokia Corporation, 2006, 2007 5 * 6 * Author: Artem Bityutskiy (Битюцкий Артём) 7 */ 8 9 #ifndef __UBI_UBI_H__ 10 #define __UBI_UBI_H__ 11 12 #include <linux/types.h> 13 #include <linux/list.h> 14 #include <linux/rbtree.h> 15 #include <linux/sched.h> 16 #include <linux/wait.h> 17 #include <linux/mutex.h> 18 #include <linux/rwsem.h> 19 #include <linux/spinlock.h> 20 #include <linux/fs.h> 21 #include <linux/cdev.h> 22 #include <linux/device.h> 23 #include <linux/slab.h> 24 #include <linux/string.h> 25 #include <linux/vmalloc.h> 26 #include <linux/notifier.h> 27 #include <linux/mtd/mtd.h> 28 #include <linux/mtd/ubi.h> 29 #include <linux/pgtable.h> 30 31 #include "ubi-media.h" 32 33 /* Maximum number of supported UBI devices */ 34 #define UBI_MAX_DEVICES 32 35 36 /* UBI name used for character devices, sysfs, etc */ 37 #define UBI_NAME_STR "ubi" 38 39 struct ubi_device; 40 41 /* Normal UBI messages */ 42 __printf(2, 3) 43 void ubi_msg(const struct ubi_device *ubi, const char *fmt, ...); 44 45 /* UBI warning messages */ 46 __printf(2, 3) 47 void ubi_warn(const struct ubi_device *ubi, const char *fmt, ...); 48 49 /* UBI error messages */ 50 __printf(2, 3) 51 void ubi_err(const struct ubi_device *ubi, const char *fmt, ...); 52 53 /* Background thread name pattern */ 54 #define UBI_BGT_NAME_PATTERN "ubi_bgt%dd" 55 56 /* 57 * This marker in the EBA table means that the LEB is um-mapped. 58 * NOTE! It has to have the same value as %UBI_ALL. 59 */ 60 #define UBI_LEB_UNMAPPED -1 61 62 /* 63 * In case of errors, UBI tries to repeat the operation several times before 64 * returning error. The below constant defines how many times UBI re-tries. 65 */ 66 #define UBI_IO_RETRIES 3 67 68 /* 69 * Length of the protection queue. The length is effectively equivalent to the 70 * number of (global) erase cycles PEBs are protected from the wear-leveling 71 * worker. 72 */ 73 #define UBI_PROT_QUEUE_LEN 10 74 75 /* The volume ID/LEB number/erase counter is unknown */ 76 #define UBI_UNKNOWN -1 77 78 /* 79 * The UBI debugfs directory name pattern and maximum name length (3 for "ubi" 80 * + 2 for the number plus 1 for the trailing zero byte. 81 */ 82 #define UBI_DFS_DIR_NAME "ubi%d" 83 #define UBI_DFS_DIR_LEN (3 + 2 + 1) 84 85 /* 86 * Error codes returned by the I/O sub-system. 87 * 88 * UBI_IO_FF: the read region of flash contains only 0xFFs 89 * UBI_IO_FF_BITFLIPS: the same as %UBI_IO_FF, but also also there was a data 90 * integrity error reported by the MTD driver 91 * (uncorrectable ECC error in case of NAND) 92 * UBI_IO_BAD_HDR: the EC or VID header is corrupted (bad magic or CRC) 93 * UBI_IO_BAD_HDR_EBADMSG: the same as %UBI_IO_BAD_HDR, but also there was a 94 * data integrity error reported by the MTD driver 95 * (uncorrectable ECC error in case of NAND) 96 * UBI_IO_BITFLIPS: bit-flips were detected and corrected 97 * 98 * Note, it is probably better to have bit-flip and ebadmsg as flags which can 99 * be or'ed with other error code. But this is a big change because there are 100 * may callers, so it does not worth the risk of introducing a bug 101 */ 102 enum { 103 UBI_IO_FF = 1, 104 UBI_IO_FF_BITFLIPS, 105 UBI_IO_BAD_HDR, 106 UBI_IO_BAD_HDR_EBADMSG, 107 UBI_IO_BITFLIPS, 108 }; 109 110 /* 111 * Return codes of the 'ubi_eba_copy_leb()' function. 112 * 113 * MOVE_CANCEL_RACE: canceled because the volume is being deleted, the source 114 * PEB was put meanwhile, or there is I/O on the source PEB 115 * MOVE_SOURCE_RD_ERR: canceled because there was a read error from the source 116 * PEB 117 * MOVE_TARGET_RD_ERR: canceled because there was a read error from the target 118 * PEB 119 * MOVE_TARGET_WR_ERR: canceled because there was a write error to the target 120 * PEB 121 * MOVE_TARGET_BITFLIPS: canceled because a bit-flip was detected in the 122 * target PEB 123 * MOVE_RETRY: retry scrubbing the PEB 124 */ 125 enum { 126 MOVE_CANCEL_RACE = 1, 127 MOVE_SOURCE_RD_ERR, 128 MOVE_TARGET_RD_ERR, 129 MOVE_TARGET_WR_ERR, 130 MOVE_TARGET_BITFLIPS, 131 MOVE_RETRY, 132 }; 133 134 /* 135 * Return codes of the fastmap sub-system 136 * 137 * UBI_NO_FASTMAP: No fastmap super block was found 138 * UBI_BAD_FASTMAP: A fastmap was found but it's unusable 139 */ 140 enum { 141 UBI_NO_FASTMAP = 1, 142 UBI_BAD_FASTMAP, 143 }; 144 145 /* 146 * Flags for emulate_power_cut in ubi_debug_info 147 * 148 * POWER_CUT_EC_WRITE: Emulate a power cut when writing an EC header 149 * POWER_CUT_VID_WRITE: Emulate a power cut when writing a VID header 150 */ 151 enum { 152 POWER_CUT_EC_WRITE = 0x01, 153 POWER_CUT_VID_WRITE = 0x02, 154 }; 155 156 /** 157 * struct ubi_vid_io_buf - VID buffer used to read/write VID info to/from the 158 * flash. 159 * @hdr: a pointer to the VID header stored in buffer 160 * @buffer: underlying buffer 161 */ 162 struct ubi_vid_io_buf { 163 struct ubi_vid_hdr *hdr; 164 void *buffer; 165 }; 166 167 /** 168 * struct ubi_wl_entry - wear-leveling entry. 169 * @u.rb: link in the corresponding (free/used) RB-tree 170 * @u.list: link in the protection queue 171 * @ec: erase counter 172 * @pnum: physical eraseblock number 173 * 174 * This data structure is used in the WL sub-system. Each physical eraseblock 175 * has a corresponding &struct wl_entry object which may be kept in different 176 * RB-trees. See WL sub-system for details. 177 */ 178 struct ubi_wl_entry { 179 union { 180 struct rb_node rb; 181 struct list_head list; 182 } u; 183 int ec; 184 int pnum; 185 }; 186 187 /** 188 * struct ubi_ltree_entry - an entry in the lock tree. 189 * @rb: links RB-tree nodes 190 * @vol_id: volume ID of the locked logical eraseblock 191 * @lnum: locked logical eraseblock number 192 * @users: how many tasks are using this logical eraseblock or wait for it 193 * @mutex: read/write mutex to implement read/write access serialization to 194 * the (@vol_id, @lnum) logical eraseblock 195 * 196 * This data structure is used in the EBA sub-system to implement per-LEB 197 * locking. When a logical eraseblock is being locked - corresponding 198 * &struct ubi_ltree_entry object is inserted to the lock tree (@ubi->ltree). 199 * See EBA sub-system for details. 200 */ 201 struct ubi_ltree_entry { 202 struct rb_node rb; 203 int vol_id; 204 int lnum; 205 int users; 206 struct rw_semaphore mutex; 207 }; 208 209 /** 210 * struct ubi_rename_entry - volume re-name description data structure. 211 * @new_name_len: new volume name length 212 * @new_name: new volume name 213 * @remove: if not zero, this volume should be removed, not re-named 214 * @desc: descriptor of the volume 215 * @list: links re-name entries into a list 216 * 217 * This data structure is utilized in the multiple volume re-name code. Namely, 218 * UBI first creates a list of &struct ubi_rename_entry objects from the 219 * &struct ubi_rnvol_req request object, and then utilizes this list to do all 220 * the job. 221 */ 222 struct ubi_rename_entry { 223 int new_name_len; 224 char new_name[UBI_VOL_NAME_MAX + 1]; 225 int remove; 226 struct ubi_volume_desc *desc; 227 struct list_head list; 228 }; 229 230 struct ubi_volume_desc; 231 232 /** 233 * struct ubi_fastmap_layout - in-memory fastmap data structure. 234 * @e: PEBs used by the current fastmap 235 * @to_be_tortured: if non-zero tortured this PEB 236 * @used_blocks: number of used PEBs 237 * @max_pool_size: maximal size of the user pool 238 * @max_wl_pool_size: maximal size of the pool used by the WL sub-system 239 */ 240 struct ubi_fastmap_layout { 241 struct ubi_wl_entry *e[UBI_FM_MAX_BLOCKS]; 242 int to_be_tortured[UBI_FM_MAX_BLOCKS]; 243 int used_blocks; 244 int max_pool_size; 245 int max_wl_pool_size; 246 }; 247 248 /** 249 * struct ubi_fm_pool - in-memory fastmap pool 250 * @pebs: PEBs in this pool 251 * @used: number of used PEBs 252 * @size: total number of PEBs in this pool 253 * @max_size: maximal size of the pool 254 * 255 * A pool gets filled with up to max_size. 256 * If all PEBs within the pool are used a new fastmap will be written 257 * to the flash and the pool gets refilled with empty PEBs. 258 * 259 */ 260 struct ubi_fm_pool { 261 int pebs[UBI_FM_MAX_POOL_SIZE]; 262 int used; 263 int size; 264 int max_size; 265 }; 266 267 /** 268 * struct ubi_eba_leb_desc - EBA logical eraseblock descriptor 269 * @lnum: the logical eraseblock number 270 * @pnum: the physical eraseblock where the LEB can be found 271 * 272 * This structure is here to hide EBA's internal from other part of the 273 * UBI implementation. 274 * 275 * One can query the position of a LEB by calling ubi_eba_get_ldesc(). 276 */ 277 struct ubi_eba_leb_desc { 278 int lnum; 279 int pnum; 280 }; 281 282 /** 283 * struct ubi_volume - UBI volume description data structure. 284 * @dev: device object to make use of the the Linux device model 285 * @cdev: character device object to create character device 286 * @ubi: reference to the UBI device description object 287 * @vol_id: volume ID 288 * @ref_count: volume reference count 289 * @readers: number of users holding this volume in read-only mode 290 * @writers: number of users holding this volume in read-write mode 291 * @exclusive: whether somebody holds this volume in exclusive mode 292 * @metaonly: whether somebody is altering only meta data of this volume 293 * 294 * @reserved_pebs: how many physical eraseblocks are reserved for this volume 295 * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME) 296 * @usable_leb_size: logical eraseblock size without padding 297 * @used_ebs: how many logical eraseblocks in this volume contain data 298 * @last_eb_bytes: how many bytes are stored in the last logical eraseblock 299 * @used_bytes: how many bytes of data this volume contains 300 * @alignment: volume alignment 301 * @data_pad: how many bytes are not used at the end of physical eraseblocks to 302 * satisfy the requested alignment 303 * @name_len: volume name length 304 * @name: volume name 305 * 306 * @upd_ebs: how many eraseblocks are expected to be updated 307 * @ch_lnum: LEB number which is being changing by the atomic LEB change 308 * operation 309 * @upd_bytes: how many bytes are expected to be received for volume update or 310 * atomic LEB change 311 * @upd_received: how many bytes were already received for volume update or 312 * atomic LEB change 313 * @upd_buf: update buffer which is used to collect update data or data for 314 * atomic LEB change 315 * 316 * @eba_tbl: EBA table of this volume (LEB->PEB mapping) 317 * @skip_check: %1 if CRC check of this static volume should be skipped. 318 * Directly reflects the presence of the 319 * %UBI_VTBL_SKIP_CRC_CHECK_FLG flag in the vtbl entry 320 * @checked: %1 if this static volume was checked 321 * @corrupted: %1 if the volume is corrupted (static volumes only) 322 * @upd_marker: %1 if the update marker is set for this volume 323 * @updating: %1 if the volume is being updated 324 * @changing_leb: %1 if the atomic LEB change ioctl command is in progress 325 * @direct_writes: %1 if direct writes are enabled for this volume 326 * 327 * @checkmap: bitmap to remember which PEB->LEB mappings got checked, 328 * protected by UBI LEB lock tree. 329 * 330 * The @corrupted field indicates that the volume's contents is corrupted. 331 * Since UBI protects only static volumes, this field is not relevant to 332 * dynamic volumes - it is user's responsibility to assure their data 333 * integrity. 334 * 335 * The @upd_marker flag indicates that this volume is either being updated at 336 * the moment or is damaged because of an unclean reboot. 337 */ 338 struct ubi_volume { 339 struct device dev; 340 struct cdev cdev; 341 struct ubi_device *ubi; 342 int vol_id; 343 int ref_count; 344 int readers; 345 int writers; 346 int exclusive; 347 int metaonly; 348 349 int reserved_pebs; 350 int vol_type; 351 int usable_leb_size; 352 int used_ebs; 353 int last_eb_bytes; 354 long long used_bytes; 355 int alignment; 356 int data_pad; 357 int name_len; 358 char name[UBI_VOL_NAME_MAX + 1]; 359 360 int upd_ebs; 361 int ch_lnum; 362 long long upd_bytes; 363 long long upd_received; 364 void *upd_buf; 365 366 struct ubi_eba_table *eba_tbl; 367 unsigned int skip_check:1; 368 unsigned int checked:1; 369 unsigned int corrupted:1; 370 unsigned int upd_marker:1; 371 unsigned int updating:1; 372 unsigned int changing_leb:1; 373 unsigned int direct_writes:1; 374 375 #ifdef CONFIG_MTD_UBI_FASTMAP 376 unsigned long *checkmap; 377 #endif 378 }; 379 380 /** 381 * struct ubi_volume_desc - UBI volume descriptor returned when it is opened. 382 * @vol: reference to the corresponding volume description object 383 * @mode: open mode (%UBI_READONLY, %UBI_READWRITE, %UBI_EXCLUSIVE 384 * or %UBI_METAONLY) 385 */ 386 struct ubi_volume_desc { 387 struct ubi_volume *vol; 388 int mode; 389 }; 390 391 struct ubi_wl_entry; 392 393 /** 394 * struct ubi_debug_info - debugging information for an UBI device. 395 * 396 * @chk_gen: if UBI general extra checks are enabled 397 * @chk_io: if UBI I/O extra checks are enabled 398 * @chk_fastmap: if UBI fastmap extra checks are enabled 399 * @disable_bgt: disable the background task for testing purposes 400 * @emulate_bitflips: emulate bit-flips for testing purposes 401 * @emulate_io_failures: emulate write/erase failures for testing purposes 402 * @emulate_power_cut: emulate power cut for testing purposes 403 * @power_cut_counter: count down for writes left until emulated power cut 404 * @power_cut_min: minimum number of writes before emulating a power cut 405 * @power_cut_max: maximum number of writes until emulating a power cut 406 * @dfs_dir_name: name of debugfs directory containing files of this UBI device 407 * @dfs_dir: direntry object of the UBI device debugfs directory 408 * @dfs_chk_gen: debugfs knob to enable UBI general extra checks 409 * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks 410 * @dfs_chk_fastmap: debugfs knob to enable UBI fastmap extra checks 411 * @dfs_disable_bgt: debugfs knob to disable the background task 412 * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips 413 * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures 414 * @dfs_emulate_power_cut: debugfs knob to emulate power cuts 415 * @dfs_power_cut_min: debugfs knob for minimum writes before power cut 416 * @dfs_power_cut_max: debugfs knob for maximum writes until power cut 417 */ 418 struct ubi_debug_info { 419 unsigned int chk_gen:1; 420 unsigned int chk_io:1; 421 unsigned int chk_fastmap:1; 422 unsigned int disable_bgt:1; 423 unsigned int emulate_bitflips:1; 424 unsigned int emulate_io_failures:1; 425 unsigned int emulate_power_cut:2; 426 unsigned int power_cut_counter; 427 unsigned int power_cut_min; 428 unsigned int power_cut_max; 429 char dfs_dir_name[UBI_DFS_DIR_LEN + 1]; 430 struct dentry *dfs_dir; 431 struct dentry *dfs_chk_gen; 432 struct dentry *dfs_chk_io; 433 struct dentry *dfs_chk_fastmap; 434 struct dentry *dfs_disable_bgt; 435 struct dentry *dfs_emulate_bitflips; 436 struct dentry *dfs_emulate_io_failures; 437 struct dentry *dfs_emulate_power_cut; 438 struct dentry *dfs_power_cut_min; 439 struct dentry *dfs_power_cut_max; 440 }; 441 442 /** 443 * struct ubi_device - UBI device description structure 444 * @dev: UBI device object to use the the Linux device model 445 * @cdev: character device object to create character device 446 * @ubi_num: UBI device number 447 * @ubi_name: UBI device name 448 * @vol_count: number of volumes in this UBI device 449 * @volumes: volumes of this UBI device 450 * @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs, 451 * @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count, 452 * @vol->readers, @vol->writers, @vol->exclusive, 453 * @vol->metaonly, @vol->ref_count, @vol->mapping and 454 * @vol->eba_tbl. 455 * @ref_count: count of references on the UBI device 456 * @image_seq: image sequence number recorded on EC headers 457 * 458 * @rsvd_pebs: count of reserved physical eraseblocks 459 * @avail_pebs: count of available physical eraseblocks 460 * @beb_rsvd_pebs: how many physical eraseblocks are reserved for bad PEB 461 * handling 462 * @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling 463 * 464 * @autoresize_vol_id: ID of the volume which has to be auto-resized at the end 465 * of UBI initialization 466 * @vtbl_slots: how many slots are available in the volume table 467 * @vtbl_size: size of the volume table in bytes 468 * @vtbl: in-RAM volume table copy 469 * @device_mutex: protects on-flash volume table and serializes volume 470 * creation, deletion, update, re-size, re-name and set 471 * property 472 * 473 * @max_ec: current highest erase counter value 474 * @mean_ec: current mean erase counter value 475 * 476 * @global_sqnum: global sequence number 477 * @ltree_lock: protects the lock tree and @global_sqnum 478 * @ltree: the lock tree 479 * @alc_mutex: serializes "atomic LEB change" operations 480 * 481 * @fm_disabled: non-zero if fastmap is disabled (default) 482 * @fm: in-memory data structure of the currently used fastmap 483 * @fm_pool: in-memory data structure of the fastmap pool 484 * @fm_wl_pool: in-memory data structure of the fastmap pool used by the WL 485 * sub-system 486 * @fm_protect: serializes ubi_update_fastmap(), protects @fm_buf and makes sure 487 * that critical sections cannot be interrupted by ubi_update_fastmap() 488 * @fm_buf: vmalloc()'d buffer which holds the raw fastmap 489 * @fm_size: fastmap size in bytes 490 * @fm_eba_sem: allows ubi_update_fastmap() to block EBA table changes 491 * @fm_work: fastmap work queue 492 * @fm_work_scheduled: non-zero if fastmap work was scheduled 493 * @fast_attach: non-zero if UBI was attached by fastmap 494 * @fm_anchor: The new anchor PEB used during fastmap update 495 * @fm_next_anchor: An anchor PEB candidate for the next time fastmap is updated 496 * @fm_do_produce_anchor: If true produce an anchor PEB in wl 497 * 498 * @used: RB-tree of used physical eraseblocks 499 * @erroneous: RB-tree of erroneous used physical eraseblocks 500 * @free: RB-tree of free physical eraseblocks 501 * @free_count: Contains the number of elements in @free 502 * @scrub: RB-tree of physical eraseblocks which need scrubbing 503 * @pq: protection queue (contain physical eraseblocks which are temporarily 504 * protected from the wear-leveling worker) 505 * @pq_head: protection queue head 506 * @wl_lock: protects the @used, @free, @pq, @pq_head, @lookuptbl, @move_from, 507 * @move_to, @move_to_put @erase_pending, @wl_scheduled, @works, 508 * @erroneous, @erroneous_peb_count, @fm_work_scheduled, @fm_pool, 509 * and @fm_wl_pool fields 510 * @move_mutex: serializes eraseblock moves 511 * @work_sem: used to wait for all the scheduled works to finish and prevent 512 * new works from being submitted 513 * @wl_scheduled: non-zero if the wear-leveling was scheduled 514 * @lookuptbl: a table to quickly find a &struct ubi_wl_entry object for any 515 * physical eraseblock 516 * @move_from: physical eraseblock from where the data is being moved 517 * @move_to: physical eraseblock where the data is being moved to 518 * @move_to_put: if the "to" PEB was put 519 * @works: list of pending works 520 * @works_count: count of pending works 521 * @bgt_thread: background thread description object 522 * @thread_enabled: if the background thread is enabled 523 * @bgt_name: background thread name 524 * 525 * @flash_size: underlying MTD device size (in bytes) 526 * @peb_count: count of physical eraseblocks on the MTD device 527 * @peb_size: physical eraseblock size 528 * @bad_peb_limit: top limit of expected bad physical eraseblocks 529 * @bad_peb_count: count of bad physical eraseblocks 530 * @good_peb_count: count of good physical eraseblocks 531 * @corr_peb_count: count of corrupted physical eraseblocks (preserved and not 532 * used by UBI) 533 * @erroneous_peb_count: count of erroneous physical eraseblocks in @erroneous 534 * @max_erroneous: maximum allowed amount of erroneous physical eraseblocks 535 * @min_io_size: minimal input/output unit size of the underlying MTD device 536 * @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers 537 * @ro_mode: if the UBI device is in read-only mode 538 * @leb_size: logical eraseblock size 539 * @leb_start: starting offset of logical eraseblocks within physical 540 * eraseblocks 541 * @ec_hdr_alsize: size of the EC header aligned to @hdrs_min_io_size 542 * @vid_hdr_alsize: size of the VID header aligned to @hdrs_min_io_size 543 * @vid_hdr_offset: starting offset of the volume identifier header (might be 544 * unaligned) 545 * @vid_hdr_aloffset: starting offset of the VID header aligned to 546 * @hdrs_min_io_size 547 * @vid_hdr_shift: contains @vid_hdr_offset - @vid_hdr_aloffset 548 * @bad_allowed: whether the MTD device admits bad physical eraseblocks or 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 struct ubi_wl_entry *fm_anchor; 606 struct ubi_wl_entry *fm_next_anchor; 607 int fm_do_produce_anchor; 608 609 /* Wear-leveling sub-system's stuff */ 610 struct rb_root used; 611 struct rb_root erroneous; 612 struct rb_root free; 613 int free_count; 614 struct rb_root scrub; 615 struct list_head pq[UBI_PROT_QUEUE_LEN]; 616 int pq_head; 617 spinlock_t wl_lock; 618 struct mutex move_mutex; 619 struct rw_semaphore work_sem; 620 int wl_scheduled; 621 struct ubi_wl_entry **lookuptbl; 622 struct ubi_wl_entry *move_from; 623 struct ubi_wl_entry *move_to; 624 int move_to_put; 625 struct list_head works; 626 int works_count; 627 struct task_struct *bgt_thread; 628 int thread_enabled; 629 char bgt_name[sizeof(UBI_BGT_NAME_PATTERN)+2]; 630 631 /* I/O sub-system's stuff */ 632 long long flash_size; 633 int peb_count; 634 int peb_size; 635 int bad_peb_count; 636 int good_peb_count; 637 int corr_peb_count; 638 int erroneous_peb_count; 639 int max_erroneous; 640 int min_io_size; 641 int hdrs_min_io_size; 642 int ro_mode; 643 int leb_size; 644 int leb_start; 645 int ec_hdr_alsize; 646 int vid_hdr_alsize; 647 int vid_hdr_offset; 648 int vid_hdr_aloffset; 649 int vid_hdr_shift; 650 unsigned int bad_allowed:1; 651 unsigned int nor_flash:1; 652 int max_write_size; 653 struct mtd_info *mtd; 654 655 void *peb_buf; 656 struct mutex buf_mutex; 657 struct mutex ckvol_mutex; 658 659 struct ubi_debug_info dbg; 660 }; 661 662 /** 663 * struct ubi_ainf_peb - attach information about a physical eraseblock. 664 * @ec: erase counter (%UBI_UNKNOWN if it is unknown) 665 * @pnum: physical eraseblock number 666 * @vol_id: ID of the volume this LEB belongs to 667 * @lnum: logical eraseblock number 668 * @scrub: if this physical eraseblock needs scrubbing 669 * @copy_flag: this LEB is a copy (@copy_flag is set in VID header of this LEB) 670 * @sqnum: sequence number 671 * @u: unions RB-tree or @list links 672 * @u.rb: link in the per-volume RB-tree of &struct ubi_ainf_peb objects 673 * @u.list: link in one of the eraseblock lists 674 * 675 * One object of this type is allocated for each physical eraseblock when 676 * attaching an MTD device. Note, if this PEB does not belong to any LEB / 677 * volume, the @vol_id and @lnum fields are initialized to %UBI_UNKNOWN. 678 */ 679 struct ubi_ainf_peb { 680 int ec; 681 int pnum; 682 int vol_id; 683 int lnum; 684 unsigned int scrub:1; 685 unsigned int copy_flag:1; 686 unsigned long long sqnum; 687 union { 688 struct rb_node rb; 689 struct list_head list; 690 } u; 691 }; 692 693 /** 694 * struct ubi_ainf_volume - attaching information about a volume. 695 * @vol_id: volume ID 696 * @highest_lnum: highest logical eraseblock number in this volume 697 * @leb_count: number of logical eraseblocks in this volume 698 * @vol_type: volume type 699 * @used_ebs: number of used logical eraseblocks in this volume (only for 700 * static volumes) 701 * @last_data_size: amount of data in the last logical eraseblock of this 702 * volume (always equivalent to the usable logical eraseblock 703 * size in case of dynamic volumes) 704 * @data_pad: how many bytes at the end of logical eraseblocks of this volume 705 * are not used (due to volume alignment) 706 * @compat: compatibility flags of this volume 707 * @rb: link in the volume RB-tree 708 * @root: root of the RB-tree containing all the eraseblock belonging to this 709 * volume (&struct ubi_ainf_peb objects) 710 * 711 * One object of this type is allocated for each volume when attaching an MTD 712 * device. 713 */ 714 struct ubi_ainf_volume { 715 int vol_id; 716 int highest_lnum; 717 int leb_count; 718 int vol_type; 719 int used_ebs; 720 int last_data_size; 721 int data_pad; 722 int compat; 723 struct rb_node rb; 724 struct rb_root root; 725 }; 726 727 /** 728 * struct ubi_attach_info - MTD device attaching information. 729 * @volumes: root of the volume RB-tree 730 * @corr: list of corrupted physical eraseblocks 731 * @free: list of free physical eraseblocks 732 * @erase: list of physical eraseblocks which have to be erased 733 * @alien: list of physical eraseblocks which should not be used by UBI (e.g., 734 * those belonging to "preserve"-compatible internal volumes) 735 * @fastmap: list of physical eraseblocks which relate to fastmap (e.g., 736 * eraseblocks of the current and not yet erased old fastmap blocks) 737 * @corr_peb_count: count of PEBs in the @corr list 738 * @empty_peb_count: count of PEBs which are presumably empty (contain only 739 * 0xFF bytes) 740 * @alien_peb_count: count of PEBs in the @alien list 741 * @bad_peb_count: count of bad physical eraseblocks 742 * @maybe_bad_peb_count: count of bad physical eraseblocks which are not marked 743 * as bad yet, but which look like bad 744 * @vols_found: number of volumes found 745 * @highest_vol_id: highest volume ID 746 * @is_empty: flag indicating whether the MTD device is empty or not 747 * @force_full_scan: flag indicating whether we need to do a full scan and drop 748 all existing Fastmap data structures 749 * @min_ec: lowest erase counter value 750 * @max_ec: highest erase counter value 751 * @max_sqnum: highest sequence number value 752 * @mean_ec: mean erase counter value 753 * @ec_sum: a temporary variable used when calculating @mean_ec 754 * @ec_count: a temporary variable used when calculating @mean_ec 755 * @aeb_slab_cache: slab cache for &struct ubi_ainf_peb objects 756 * @ech: temporary EC header. Only available during scan 757 * @vidh: temporary VID buffer. Only available during scan 758 * 759 * This data structure contains the result of attaching an MTD device and may 760 * be used by other UBI sub-systems to build final UBI data structures, further 761 * error-recovery and so on. 762 */ 763 struct ubi_attach_info { 764 struct rb_root volumes; 765 struct list_head corr; 766 struct list_head free; 767 struct list_head erase; 768 struct list_head alien; 769 struct list_head fastmap; 770 int corr_peb_count; 771 int empty_peb_count; 772 int alien_peb_count; 773 int bad_peb_count; 774 int maybe_bad_peb_count; 775 int vols_found; 776 int highest_vol_id; 777 int is_empty; 778 int force_full_scan; 779 int min_ec; 780 int max_ec; 781 unsigned long long max_sqnum; 782 int mean_ec; 783 uint64_t ec_sum; 784 int ec_count; 785 struct kmem_cache *aeb_slab_cache; 786 struct ubi_ec_hdr *ech; 787 struct ubi_vid_io_buf *vidb; 788 }; 789 790 /** 791 * struct ubi_work - UBI work description data structure. 792 * @list: a link in the list of pending works 793 * @func: worker function 794 * @e: physical eraseblock to erase 795 * @vol_id: the volume ID on which this erasure is being performed 796 * @lnum: the logical eraseblock number 797 * @torture: if the physical eraseblock has to be tortured 798 * 799 * The @func pointer points to the worker function. If the @shutdown argument is 800 * not zero, the worker has to free the resources and exit immediately as the 801 * WL sub-system is shutting down. 802 * The worker has to return zero in case of success and a negative error code in 803 * case of failure. 804 */ 805 struct ubi_work { 806 struct list_head list; 807 int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int shutdown); 808 /* The below fields are only relevant to erasure works */ 809 struct ubi_wl_entry *e; 810 int vol_id; 811 int lnum; 812 int torture; 813 }; 814 815 #include "debug.h" 816 817 extern struct kmem_cache *ubi_wl_entry_slab; 818 extern const struct file_operations ubi_ctrl_cdev_operations; 819 extern const struct file_operations ubi_cdev_operations; 820 extern const struct file_operations ubi_vol_cdev_operations; 821 extern struct class ubi_class; 822 extern struct mutex ubi_devices_mutex; 823 extern struct blocking_notifier_head ubi_notifiers; 824 825 /* attach.c */ 826 struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum, 827 int ec); 828 void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb); 829 int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum, 830 int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips); 831 struct ubi_ainf_volume *ubi_add_av(struct ubi_attach_info *ai, int vol_id); 832 struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai, 833 int vol_id); 834 void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av); 835 struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi, 836 struct ubi_attach_info *ai); 837 int ubi_attach(struct ubi_device *ubi, int force_scan); 838 void ubi_destroy_ai(struct ubi_attach_info *ai); 839 840 /* vtbl.c */ 841 int ubi_change_vtbl_record(struct ubi_device *ubi, int idx, 842 struct ubi_vtbl_record *vtbl_rec); 843 int ubi_vtbl_rename_volumes(struct ubi_device *ubi, 844 struct list_head *rename_list); 845 int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai); 846 847 /* vmt.c */ 848 int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req); 849 int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl); 850 int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs); 851 int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list); 852 int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol); 853 void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol); 854 855 /* upd.c */ 856 int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol, 857 long long bytes); 858 int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol, 859 const void __user *buf, int count); 860 int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, 861 const struct ubi_leb_change_req *req); 862 int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol, 863 const void __user *buf, int count); 864 865 /* misc.c */ 866 int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf, 867 int length); 868 int ubi_check_volume(struct ubi_device *ubi, int vol_id); 869 void ubi_update_reserved(struct ubi_device *ubi); 870 void ubi_calculate_reserved(struct ubi_device *ubi); 871 int ubi_check_pattern(const void *buf, uint8_t patt, int size); 872 873 static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum) 874 { 875 return lnum >= 0 && lnum < vol->reserved_pebs; 876 } 877 878 /* eba.c */ 879 struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol, 880 int nentries); 881 void ubi_eba_destroy_table(struct ubi_eba_table *tbl); 882 void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst, 883 int nentries); 884 void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl); 885 void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum, 886 struct ubi_eba_leb_desc *ldesc); 887 bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum); 888 int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, 889 int lnum); 890 int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, 891 void *buf, int offset, int len, int check); 892 int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol, 893 struct ubi_sgl *sgl, int lnum, int offset, int len, 894 int check); 895 int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, 896 const void *buf, int offset, int len); 897 int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, 898 int lnum, const void *buf, int len, int used_ebs); 899 int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, 900 int lnum, const void *buf, int len); 901 int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, 902 struct ubi_vid_io_buf *vidb); 903 int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai); 904 unsigned long long ubi_next_sqnum(struct ubi_device *ubi); 905 int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap, 906 struct ubi_attach_info *ai_scan); 907 908 /* wl.c */ 909 int ubi_wl_get_peb(struct ubi_device *ubi); 910 int ubi_wl_put_peb(struct ubi_device *ubi, int vol_id, int lnum, 911 int pnum, int torture); 912 int ubi_wl_flush(struct ubi_device *ubi, int vol_id, int lnum); 913 int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum); 914 int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai); 915 void ubi_wl_close(struct ubi_device *ubi); 916 int ubi_thread(void *u); 917 struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor); 918 int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *used_e, 919 int lnum, int torture); 920 int ubi_is_erase_work(struct ubi_work *wrk); 921 void ubi_refill_pools(struct ubi_device *ubi); 922 int ubi_ensure_anchor_pebs(struct ubi_device *ubi); 923 int ubi_bitflip_check(struct ubi_device *ubi, int pnum, int force_scrub); 924 925 /* io.c */ 926 int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset, 927 int len); 928 int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset, 929 int len); 930 int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture); 931 int ubi_io_is_bad(const struct ubi_device *ubi, int pnum); 932 int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum); 933 int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, 934 struct ubi_ec_hdr *ec_hdr, int verbose); 935 int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum, 936 struct ubi_ec_hdr *ec_hdr); 937 int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, 938 struct ubi_vid_io_buf *vidb, int verbose); 939 int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, 940 struct ubi_vid_io_buf *vidb); 941 942 /* build.c */ 943 int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, 944 int vid_hdr_offset, int max_beb_per1024); 945 int ubi_detach_mtd_dev(int ubi_num, int anyway); 946 struct ubi_device *ubi_get_device(int ubi_num); 947 void ubi_put_device(struct ubi_device *ubi); 948 struct ubi_device *ubi_get_by_major(int major); 949 int ubi_major2num(int major); 950 int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, 951 int ntype); 952 int ubi_notify_all(struct ubi_device *ubi, int ntype, 953 struct notifier_block *nb); 954 int ubi_enumerate_volumes(struct notifier_block *nb); 955 void ubi_free_all_volumes(struct ubi_device *ubi); 956 void ubi_free_internal_volumes(struct ubi_device *ubi); 957 958 /* kapi.c */ 959 void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di); 960 void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol, 961 struct ubi_volume_info *vi); 962 /* scan.c */ 963 int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb, 964 int pnum, const struct ubi_vid_hdr *vid_hdr); 965 966 /* fastmap.c */ 967 #ifdef CONFIG_MTD_UBI_FASTMAP 968 size_t ubi_calc_fm_size(struct ubi_device *ubi); 969 int ubi_update_fastmap(struct ubi_device *ubi); 970 int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai, 971 struct ubi_attach_info *scan_ai); 972 int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count); 973 void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol); 974 #else 975 static inline int ubi_update_fastmap(struct ubi_device *ubi) { return 0; } 976 static inline int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count) { return 0; } 977 static inline void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol) {} 978 #endif 979 980 /* block.c */ 981 #ifdef CONFIG_MTD_UBI_BLOCK 982 int ubiblock_init(void); 983 void ubiblock_exit(void); 984 int ubiblock_create(struct ubi_volume_info *vi); 985 int ubiblock_remove(struct ubi_volume_info *vi); 986 #else 987 static inline int ubiblock_init(void) { return 0; } 988 static inline void ubiblock_exit(void) {} 989 static inline int ubiblock_create(struct ubi_volume_info *vi) 990 { 991 return -ENOSYS; 992 } 993 static inline int ubiblock_remove(struct ubi_volume_info *vi) 994 { 995 return -ENOSYS; 996 } 997 #endif 998 999 /* 1000 * ubi_for_each_free_peb - walk the UBI free RB tree. 1001 * @ubi: UBI device description object 1002 * @e: a pointer to a ubi_wl_entry to use as cursor 1003 * @pos: a pointer to RB-tree entry type to use as a loop counter 1004 */ 1005 #define ubi_for_each_free_peb(ubi, e, tmp_rb) \ 1006 ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->free, u.rb) 1007 1008 /* 1009 * ubi_for_each_used_peb - walk the UBI used RB tree. 1010 * @ubi: UBI device description object 1011 * @e: a pointer to a ubi_wl_entry to use as cursor 1012 * @pos: a pointer to RB-tree entry type to use as a loop counter 1013 */ 1014 #define ubi_for_each_used_peb(ubi, e, tmp_rb) \ 1015 ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->used, u.rb) 1016 1017 /* 1018 * ubi_for_each_scub_peb - walk the UBI scub RB tree. 1019 * @ubi: UBI device description object 1020 * @e: a pointer to a ubi_wl_entry to use as cursor 1021 * @pos: a pointer to RB-tree entry type to use as a loop counter 1022 */ 1023 #define ubi_for_each_scrub_peb(ubi, e, tmp_rb) \ 1024 ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->scrub, u.rb) 1025 1026 /* 1027 * ubi_for_each_protected_peb - walk the UBI protection queue. 1028 * @ubi: UBI device description object 1029 * @i: a integer used as counter 1030 * @e: a pointer to a ubi_wl_entry to use as cursor 1031 */ 1032 #define ubi_for_each_protected_peb(ubi, i, e) \ 1033 for ((i) = 0; (i) < UBI_PROT_QUEUE_LEN; (i)++) \ 1034 list_for_each_entry((e), &(ubi->pq[(i)]), u.list) 1035 1036 /* 1037 * ubi_rb_for_each_entry - walk an RB-tree. 1038 * @rb: a pointer to type 'struct rb_node' to use as a loop counter 1039 * @pos: a pointer to RB-tree entry type to use as a loop counter 1040 * @root: RB-tree's root 1041 * @member: the name of the 'struct rb_node' within the RB-tree entry 1042 */ 1043 #define ubi_rb_for_each_entry(rb, pos, root, member) \ 1044 for (rb = rb_first(root), \ 1045 pos = (rb ? container_of(rb, typeof(*pos), member) : NULL); \ 1046 rb; \ 1047 rb = rb_next(rb), \ 1048 pos = (rb ? container_of(rb, typeof(*pos), member) : NULL)) 1049 1050 /* 1051 * ubi_move_aeb_to_list - move a PEB from the volume tree to a list. 1052 * 1053 * @av: volume attaching information 1054 * @aeb: attaching eraseblock information 1055 * @list: the list to move to 1056 */ 1057 static inline void ubi_move_aeb_to_list(struct ubi_ainf_volume *av, 1058 struct ubi_ainf_peb *aeb, 1059 struct list_head *list) 1060 { 1061 rb_erase(&aeb->u.rb, &av->root); 1062 list_add_tail(&aeb->u.list, list); 1063 } 1064 1065 /** 1066 * ubi_init_vid_buf - Initialize a VID buffer 1067 * @ubi: the UBI device 1068 * @vidb: the VID buffer to initialize 1069 * @buf: the underlying buffer 1070 */ 1071 static inline void ubi_init_vid_buf(const struct ubi_device *ubi, 1072 struct ubi_vid_io_buf *vidb, 1073 void *buf) 1074 { 1075 if (buf) 1076 memset(buf, 0, ubi->vid_hdr_alsize); 1077 1078 vidb->buffer = buf; 1079 vidb->hdr = buf + ubi->vid_hdr_shift; 1080 } 1081 1082 /** 1083 * ubi_init_vid_buf - Allocate a VID buffer 1084 * @ubi: the UBI device 1085 * @gfp_flags: GFP flags to use for the allocation 1086 */ 1087 static inline struct ubi_vid_io_buf * 1088 ubi_alloc_vid_buf(const struct ubi_device *ubi, gfp_t gfp_flags) 1089 { 1090 struct ubi_vid_io_buf *vidb; 1091 void *buf; 1092 1093 vidb = kzalloc(sizeof(*vidb), gfp_flags); 1094 if (!vidb) 1095 return NULL; 1096 1097 buf = kmalloc(ubi->vid_hdr_alsize, gfp_flags); 1098 if (!buf) { 1099 kfree(vidb); 1100 return NULL; 1101 } 1102 1103 ubi_init_vid_buf(ubi, vidb, buf); 1104 1105 return vidb; 1106 } 1107 1108 /** 1109 * ubi_free_vid_buf - Free a VID buffer 1110 * @vidb: the VID buffer to free 1111 */ 1112 static inline void ubi_free_vid_buf(struct ubi_vid_io_buf *vidb) 1113 { 1114 if (!vidb) 1115 return; 1116 1117 kfree(vidb->buffer); 1118 kfree(vidb); 1119 } 1120 1121 /** 1122 * ubi_get_vid_hdr - Get the VID header attached to a VID buffer 1123 * @vidb: VID buffer 1124 */ 1125 static inline struct ubi_vid_hdr *ubi_get_vid_hdr(struct ubi_vid_io_buf *vidb) 1126 { 1127 return vidb->hdr; 1128 } 1129 1130 /* 1131 * This function is equivalent to 'ubi_io_read()', but @offset is relative to 1132 * the beginning of the logical eraseblock, not to the beginning of the 1133 * physical eraseblock. 1134 */ 1135 static inline int ubi_io_read_data(const struct ubi_device *ubi, void *buf, 1136 int pnum, int offset, int len) 1137 { 1138 ubi_assert(offset >= 0); 1139 return ubi_io_read(ubi, buf, pnum, offset + ubi->leb_start, len); 1140 } 1141 1142 /* 1143 * This function is equivalent to 'ubi_io_write()', but @offset is relative to 1144 * the beginning of the logical eraseblock, not to the beginning of the 1145 * physical eraseblock. 1146 */ 1147 static inline int ubi_io_write_data(struct ubi_device *ubi, const void *buf, 1148 int pnum, int offset, int len) 1149 { 1150 ubi_assert(offset >= 0); 1151 return ubi_io_write(ubi, buf, pnum, offset + ubi->leb_start, len); 1152 } 1153 1154 /** 1155 * ubi_ro_mode - switch to read-only mode. 1156 * @ubi: UBI device description object 1157 */ 1158 static inline void ubi_ro_mode(struct ubi_device *ubi) 1159 { 1160 if (!ubi->ro_mode) { 1161 ubi->ro_mode = 1; 1162 ubi_warn(ubi, "switch to read-only mode"); 1163 dump_stack(); 1164 } 1165 } 1166 1167 /** 1168 * vol_id2idx - get table index by volume ID. 1169 * @ubi: UBI device description object 1170 * @vol_id: volume ID 1171 */ 1172 static inline int vol_id2idx(const struct ubi_device *ubi, int vol_id) 1173 { 1174 if (vol_id >= UBI_INTERNAL_VOL_START) 1175 return vol_id - UBI_INTERNAL_VOL_START + ubi->vtbl_slots; 1176 else 1177 return vol_id; 1178 } 1179 1180 /** 1181 * idx2vol_id - get volume ID by table index. 1182 * @ubi: UBI device description object 1183 * @idx: table index 1184 */ 1185 static inline int idx2vol_id(const struct ubi_device *ubi, int idx) 1186 { 1187 if (idx >= ubi->vtbl_slots) 1188 return idx - ubi->vtbl_slots + UBI_INTERNAL_VOL_START; 1189 else 1190 return idx; 1191 } 1192 1193 /** 1194 * ubi_is_fm_vol - check whether a volume ID is a Fastmap volume. 1195 * @vol_id: volume ID 1196 */ 1197 static inline bool ubi_is_fm_vol(int vol_id) 1198 { 1199 switch (vol_id) { 1200 case UBI_FM_SB_VOLUME_ID: 1201 case UBI_FM_DATA_VOLUME_ID: 1202 return true; 1203 } 1204 1205 return false; 1206 } 1207 1208 /** 1209 * ubi_find_fm_block - check whether a PEB is part of the current Fastmap. 1210 * @ubi: UBI device description object 1211 * @pnum: physical eraseblock to look for 1212 * 1213 * This function returns a wear leveling object if @pnum relates to the current 1214 * fastmap, @NULL otherwise. 1215 */ 1216 static inline struct ubi_wl_entry *ubi_find_fm_block(const struct ubi_device *ubi, 1217 int pnum) 1218 { 1219 int i; 1220 1221 if (ubi->fm) { 1222 for (i = 0; i < ubi->fm->used_blocks; i++) { 1223 if (ubi->fm->e[i]->pnum == pnum) 1224 return ubi->fm->e[i]; 1225 } 1226 } 1227 1228 return NULL; 1229 } 1230 1231 #endif /* !__UBI_UBI_H__ */ 1232