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
  39struct ubi_device;
  40
  41/* Normal UBI messages */
  42__printf(2, 3)
  43void ubi_msg(const struct ubi_device *ubi, const char *fmt, ...);
  44
  45/* UBI warning messages */
  46__printf(2, 3)
  47void ubi_warn(const struct ubi_device *ubi, const char *fmt, ...);
  48
  49/* UBI error messages */
  50__printf(2, 3)
  51void 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/* Number of physical eraseblocks reserved for atomic LEB change operation */
  86#define EBA_RESERVED_PEBS 1
  87
  88/*
  89 * Error codes returned by the I/O sub-system.
  90 *
  91 * UBI_IO_FF: the read region of flash contains only 0xFFs
  92 * UBI_IO_FF_BITFLIPS: the same as %UBI_IO_FF, but also there was a data
  93 *                     integrity error reported by the MTD driver
  94 *                     (uncorrectable ECC error in case of NAND)
  95 * UBI_IO_BAD_HDR: the EC or VID header is corrupted (bad magic or CRC)
  96 * UBI_IO_BAD_HDR_EBADMSG: the same as %UBI_IO_BAD_HDR, but also there was a
  97 *                         data integrity error reported by the MTD driver
  98 *                         (uncorrectable ECC error in case of NAND)
  99 * UBI_IO_BITFLIPS: bit-flips were detected and corrected
 100 *
 101 * Note, it is probably better to have bit-flip and ebadmsg as flags which can
 102 * be or'ed with other error code. But this is a big change because there are
 103 * may callers, so it does not worth the risk of introducing a bug
 104 */
 105enum {
 106	UBI_IO_FF = 1,
 107	UBI_IO_FF_BITFLIPS,
 108	UBI_IO_BAD_HDR,
 109	UBI_IO_BAD_HDR_EBADMSG,
 110	UBI_IO_BITFLIPS,
 111};
 112
 113/*
 114 * Return codes of the 'ubi_eba_copy_leb()' function.
 115 *
 116 * MOVE_CANCEL_RACE: canceled because the volume is being deleted, the source
 117 *                   PEB was put meanwhile, or there is I/O on the source PEB
 118 * MOVE_SOURCE_RD_ERR: canceled because there was a read error from the source
 119 *                     PEB
 120 * MOVE_TARGET_RD_ERR: canceled because there was a read error from the target
 121 *                     PEB
 122 * MOVE_TARGET_WR_ERR: canceled because there was a write error to the target
 123 *                     PEB
 124 * MOVE_TARGET_BITFLIPS: canceled because a bit-flip was detected in the
 125 *                       target PEB
 126 * MOVE_RETRY: retry scrubbing the PEB
 127 */
 128enum {
 129	MOVE_CANCEL_RACE = 1,
 130	MOVE_SOURCE_RD_ERR,
 131	MOVE_TARGET_RD_ERR,
 132	MOVE_TARGET_WR_ERR,
 133	MOVE_TARGET_BITFLIPS,
 134	MOVE_RETRY,
 135};
 136
 137/*
 138 * Return codes of the fastmap sub-system
 139 *
 140 * UBI_NO_FASTMAP: No fastmap super block was found
 141 * UBI_BAD_FASTMAP: A fastmap was found but it's unusable
 142 */
 143enum {
 144	UBI_NO_FASTMAP = 1,
 145	UBI_BAD_FASTMAP,
 146};
 147
 
 
 
 
 
 
 
 
 
 
 
 148/**
 149 * struct ubi_vid_io_buf - VID buffer used to read/write VID info to/from the
 150 *			   flash.
 151 * @hdr: a pointer to the VID header stored in buffer
 152 * @buffer: underlying buffer
 153 */
 154struct ubi_vid_io_buf {
 155	struct ubi_vid_hdr *hdr;
 156	void *buffer;
 157};
 158
 159/**
 160 * struct ubi_wl_entry - wear-leveling entry.
 161 * @u.rb: link in the corresponding (free/used) RB-tree
 162 * @u.list: link in the protection queue
 163 * @ec: erase counter
 164 * @pnum: physical eraseblock number
 165 *
 166 * This data structure is used in the WL sub-system. Each physical eraseblock
 167 * has a corresponding &struct wl_entry object which may be kept in different
 168 * RB-trees. See WL sub-system for details.
 169 */
 170struct ubi_wl_entry {
 171	union {
 172		struct rb_node rb;
 173		struct list_head list;
 174	} u;
 175	int ec;
 176	int pnum;
 177};
 178
 179/**
 180 * struct ubi_ltree_entry - an entry in the lock tree.
 181 * @rb: links RB-tree nodes
 182 * @vol_id: volume ID of the locked logical eraseblock
 183 * @lnum: locked logical eraseblock number
 184 * @users: how many tasks are using this logical eraseblock or wait for it
 185 * @mutex: read/write mutex to implement read/write access serialization to
 186 *         the (@vol_id, @lnum) logical eraseblock
 187 *
 188 * This data structure is used in the EBA sub-system to implement per-LEB
 189 * locking. When a logical eraseblock is being locked - corresponding
 190 * &struct ubi_ltree_entry object is inserted to the lock tree (@ubi->ltree).
 191 * See EBA sub-system for details.
 192 */
 193struct ubi_ltree_entry {
 194	struct rb_node rb;
 195	int vol_id;
 196	int lnum;
 197	int users;
 198	struct rw_semaphore mutex;
 199};
 200
 201/**
 202 * struct ubi_rename_entry - volume re-name description data structure.
 203 * @new_name_len: new volume name length
 204 * @new_name: new volume name
 205 * @remove: if not zero, this volume should be removed, not re-named
 206 * @desc: descriptor of the volume
 207 * @list: links re-name entries into a list
 208 *
 209 * This data structure is utilized in the multiple volume re-name code. Namely,
 210 * UBI first creates a list of &struct ubi_rename_entry objects from the
 211 * &struct ubi_rnvol_req request object, and then utilizes this list to do all
 212 * the job.
 213 */
 214struct ubi_rename_entry {
 215	int new_name_len;
 216	char new_name[UBI_VOL_NAME_MAX + 1];
 217	int remove;
 218	struct ubi_volume_desc *desc;
 219	struct list_head list;
 220};
 221
 222struct ubi_volume_desc;
 223
 224/**
 225 * struct ubi_fastmap_layout - in-memory fastmap data structure.
 226 * @e: PEBs used by the current fastmap
 227 * @to_be_tortured: if non-zero tortured this PEB
 228 * @used_blocks: number of used PEBs
 229 * @max_pool_size: maximal size of the user pool
 230 * @max_wl_pool_size: maximal size of the pool used by the WL sub-system
 231 */
 232struct ubi_fastmap_layout {
 233	struct ubi_wl_entry *e[UBI_FM_MAX_BLOCKS];
 234	int to_be_tortured[UBI_FM_MAX_BLOCKS];
 235	int used_blocks;
 236	int max_pool_size;
 237	int max_wl_pool_size;
 238};
 239
 240/**
 241 * struct ubi_fm_pool - in-memory fastmap pool
 242 * @pebs: PEBs in this pool
 243 * @used: number of used PEBs
 244 * @size: total number of PEBs in this pool
 245 * @max_size: maximal size of the pool
 246 *
 247 * A pool gets filled with up to max_size.
 248 * If all PEBs within the pool are used a new fastmap will be written
 249 * to the flash and the pool gets refilled with empty PEBs.
 250 *
 251 */
 252struct ubi_fm_pool {
 253	int pebs[UBI_FM_MAX_POOL_SIZE];
 254	int used;
 255	int size;
 256	int max_size;
 257};
 258
 259/**
 260 * struct ubi_eba_leb_desc - EBA logical eraseblock descriptor
 261 * @lnum: the logical eraseblock number
 262 * @pnum: the physical eraseblock where the LEB can be found
 263 *
 264 * This structure is here to hide EBA's internal from other part of the
 265 * UBI implementation.
 266 *
 267 * One can query the position of a LEB by calling ubi_eba_get_ldesc().
 268 */
 269struct ubi_eba_leb_desc {
 270	int lnum;
 271	int pnum;
 272};
 273
 274/**
 275 * struct ubi_volume - UBI volume description data structure.
 276 * @dev: device object to make use of the Linux device model
 277 * @cdev: character device object to create character device
 278 * @ubi: reference to the UBI device description object
 279 * @vol_id: volume ID
 280 * @ref_count: volume reference count
 281 * @readers: number of users holding this volume in read-only mode
 282 * @writers: number of users holding this volume in read-write mode
 283 * @exclusive: whether somebody holds this volume in exclusive mode
 284 * @metaonly: whether somebody is altering only meta data of this volume
 285 *
 286 * @reserved_pebs: how many physical eraseblocks are reserved for this volume
 287 * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME)
 288 * @usable_leb_size: logical eraseblock size without padding
 289 * @used_ebs: how many logical eraseblocks in this volume contain data
 290 * @last_eb_bytes: how many bytes are stored in the last logical eraseblock
 291 * @used_bytes: how many bytes of data this volume contains
 292 * @alignment: volume alignment
 293 * @data_pad: how many bytes are not used at the end of physical eraseblocks to
 294 *            satisfy the requested alignment
 295 * @name_len: volume name length
 296 * @name: volume name
 297 *
 298 * @upd_ebs: how many eraseblocks are expected to be updated
 299 * @ch_lnum: LEB number which is being changing by the atomic LEB change
 300 *           operation
 301 * @upd_bytes: how many bytes are expected to be received for volume update or
 302 *             atomic LEB change
 303 * @upd_received: how many bytes were already received for volume update or
 304 *                atomic LEB change
 305 * @upd_buf: update buffer which is used to collect update data or data for
 306 *           atomic LEB change
 307 *
 308 * @eba_tbl: EBA table of this volume (LEB->PEB mapping)
 309 * @skip_check: %1 if CRC check of this static volume should be skipped.
 310 *		Directly reflects the presence of the
 311 *		%UBI_VTBL_SKIP_CRC_CHECK_FLG flag in the vtbl entry
 312 * @checked: %1 if this static volume was checked
 313 * @corrupted: %1 if the volume is corrupted (static volumes only)
 314 * @upd_marker: %1 if the update marker is set for this volume
 315 * @updating: %1 if the volume is being updated
 316 * @changing_leb: %1 if the atomic LEB change ioctl command is in progress
 317 * @direct_writes: %1 if direct writes are enabled for this volume
 318 *
 319 * @checkmap: bitmap to remember which PEB->LEB mappings got checked,
 320 *            protected by UBI LEB lock tree.
 321 *
 322 * The @corrupted field indicates that the volume's contents is corrupted.
 323 * Since UBI protects only static volumes, this field is not relevant to
 324 * dynamic volumes - it is user's responsibility to assure their data
 325 * integrity.
 326 *
 327 * The @upd_marker flag indicates that this volume is either being updated at
 328 * the moment or is damaged because of an unclean reboot.
 329 */
 330struct ubi_volume {
 331	struct device dev;
 332	struct cdev cdev;
 333	struct ubi_device *ubi;
 334	int vol_id;
 335	int ref_count;
 336	int readers;
 337	int writers;
 338	int exclusive;
 339	int metaonly;
 340
 341	int reserved_pebs;
 342	int vol_type;
 343	int usable_leb_size;
 344	int used_ebs;
 345	int last_eb_bytes;
 346	long long used_bytes;
 347	int alignment;
 348	int data_pad;
 349	int name_len;
 350	char name[UBI_VOL_NAME_MAX + 1];
 351
 352	int upd_ebs;
 353	int ch_lnum;
 354	long long upd_bytes;
 355	long long upd_received;
 356	void *upd_buf;
 357
 358	struct ubi_eba_table *eba_tbl;
 359	unsigned int skip_check:1;
 360	unsigned int checked:1;
 361	unsigned int corrupted:1;
 362	unsigned int upd_marker:1;
 363	unsigned int updating:1;
 364	unsigned int changing_leb:1;
 365	unsigned int direct_writes:1;
 366
 367#ifdef CONFIG_MTD_UBI_FASTMAP
 368	unsigned long *checkmap;
 369#endif
 370};
 371
 372/**
 373 * struct ubi_volume_desc - UBI volume descriptor returned when it is opened.
 374 * @vol: reference to the corresponding volume description object
 375 * @mode: open mode (%UBI_READONLY, %UBI_READWRITE, %UBI_EXCLUSIVE
 376 * or %UBI_METAONLY)
 377 */
 378struct ubi_volume_desc {
 379	struct ubi_volume *vol;
 380	int mode;
 381};
 382
 
 
 383/**
 384 * struct ubi_debug_info - debugging information for an UBI device.
 385 *
 386 * @chk_gen: if UBI general extra checks are enabled
 387 * @chk_io: if UBI I/O extra checks are enabled
 388 * @chk_fastmap: if UBI fastmap extra checks are enabled
 389 * @disable_bgt: disable the background task for testing purposes
 390 * @emulate_bitflips: emulate bit-flips for testing purposes
 391 * @emulate_io_failures: emulate write/erase failures for testing purposes
 392 * @emulate_power_cut: emulate power cut for testing purposes
 393 * @power_cut_counter: count down for writes left until emulated power cut
 394 * @power_cut_min: minimum number of writes before emulating a power cut
 395 * @power_cut_max: maximum number of writes until emulating a power cut
 396 * @emulate_failures: emulate failures for testing purposes
 397 * @dfs_dir_name: name of debugfs directory containing files of this UBI device
 398 * @dfs_dir: direntry object of the UBI device debugfs directory
 399 * @dfs_chk_gen: debugfs knob to enable UBI general extra checks
 400 * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks
 401 * @dfs_chk_fastmap: debugfs knob to enable UBI fastmap extra checks
 402 * @dfs_disable_bgt: debugfs knob to disable the background task
 403 * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
 404 * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
 405 * @dfs_emulate_power_cut: debugfs knob to emulate power cuts
 406 * @dfs_power_cut_min: debugfs knob for minimum writes before power cut
 407 * @dfs_power_cut_max: debugfs knob for maximum writes until power cut
 408 * @dfs_emulate_failures: debugfs entry to control the fault injection type
 409 */
 410struct ubi_debug_info {
 411	unsigned int chk_gen:1;
 412	unsigned int chk_io:1;
 413	unsigned int chk_fastmap:1;
 414	unsigned int disable_bgt:1;
 415	unsigned int emulate_bitflips:1;
 416	unsigned int emulate_io_failures:1;
 417	unsigned int emulate_power_cut:2;
 418	unsigned int power_cut_counter;
 419	unsigned int power_cut_min;
 420	unsigned int power_cut_max;
 421	unsigned int emulate_failures;
 422	char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
 423	struct dentry *dfs_dir;
 424	struct dentry *dfs_chk_gen;
 425	struct dentry *dfs_chk_io;
 426	struct dentry *dfs_chk_fastmap;
 427	struct dentry *dfs_disable_bgt;
 428	struct dentry *dfs_emulate_bitflips;
 429	struct dentry *dfs_emulate_io_failures;
 430	struct dentry *dfs_emulate_power_cut;
 431	struct dentry *dfs_power_cut_min;
 432	struct dentry *dfs_power_cut_max;
 433	struct dentry *dfs_emulate_failures;
 434};
 435
 436/**
 437 * struct ubi_device - UBI device description structure
 438 * @dev: UBI device object to use the Linux device model
 439 * @cdev: character device object to create character device
 440 * @ubi_num: UBI device number
 441 * @ubi_name: UBI device name
 442 * @vol_count: number of volumes in this UBI device
 443 * @volumes: volumes of this UBI device
 444 * @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs,
 445 *                @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count,
 446 *                @vol->readers, @vol->writers, @vol->exclusive,
 447 *                @vol->metaonly, @vol->ref_count, @vol->mapping and
 448 *                @vol->eba_tbl.
 449 * @ref_count: count of references on the UBI device
 450 * @image_seq: image sequence number recorded on EC headers
 451 *
 452 * @rsvd_pebs: count of reserved physical eraseblocks
 453 * @avail_pebs: count of available physical eraseblocks
 454 * @beb_rsvd_pebs: how many physical eraseblocks are reserved for bad PEB
 455 *                 handling
 456 * @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling
 457 *
 458 * @autoresize_vol_id: ID of the volume which has to be auto-resized at the end
 459 *                     of UBI initialization
 460 * @vtbl_slots: how many slots are available in the volume table
 461 * @vtbl_size: size of the volume table in bytes
 462 * @vtbl: in-RAM volume table copy
 463 * @device_mutex: protects on-flash volume table and serializes volume
 464 *                creation, deletion, update, re-size, re-name and set
 465 *                property
 466 *
 467 * @max_ec: current highest erase counter value
 468 * @mean_ec: current mean erase counter value
 469 *
 470 * @global_sqnum: global sequence number
 471 * @ltree_lock: protects the lock tree and @global_sqnum
 472 * @ltree: the lock tree
 473 * @alc_mutex: serializes "atomic LEB change" operations
 474 *
 475 * @fm_disabled: non-zero if fastmap is disabled (default)
 476 * @fm: in-memory data structure of the currently used fastmap
 477 * @fm_pool: in-memory data structure of the fastmap pool
 478 * @fm_wl_pool: in-memory data structure of the fastmap pool used by the WL
 479 *		sub-system
 480 * @fm_protect: serializes ubi_update_fastmap(), protects @fm_buf and makes sure
 481 * that critical sections cannot be interrupted by ubi_update_fastmap()
 482 * @fm_buf: vmalloc()'d buffer which holds the raw fastmap
 483 * @fm_size: fastmap size in bytes
 484 * @fm_eba_sem: allows ubi_update_fastmap() to block EBA table changes
 485 * @fm_work: fastmap work queue
 486 * @fm_work_scheduled: non-zero if fastmap work was scheduled
 487 * @fast_attach: non-zero if UBI was attached by fastmap
 488 * @fm_anchor: The next anchor PEB to use for fastmap
 489 * @fm_do_produce_anchor: If true produce an anchor PEB in wl
 490 * @fm_pool_rsv_cnt: Number of reserved PEBs for filling pool/wl_pool
 491 *
 492 * @used: RB-tree of used physical eraseblocks
 493 * @erroneous: RB-tree of erroneous used physical eraseblocks
 494 * @free: RB-tree of free physical eraseblocks
 495 * @free_count: Contains the number of elements in @free
 496 * @scrub: RB-tree of physical eraseblocks which need scrubbing
 497 * @pq: protection queue (contain physical eraseblocks which are temporarily
 498 *      protected from the wear-leveling worker)
 499 * @pq_head: protection queue head
 500 * @wl_lock: protects the @used, @free, @pq, @pq_head, @lookuptbl, @move_from,
 501 *	     @move_to, @move_to_put @erase_pending, @wl_scheduled, @works,
 502 *	     @erroneous, @erroneous_peb_count, @fm_work_scheduled, @fm_pool,
 503 *	     and @fm_wl_pool fields
 504 * @move_mutex: serializes eraseblock moves
 505 * @work_sem: used to wait for all the scheduled works to finish and prevent
 506 * new works from being submitted
 507 * @wl_scheduled: non-zero if the wear-leveling was scheduled
 508 * @lookuptbl: a table to quickly find a &struct ubi_wl_entry object for any
 509 *             physical eraseblock
 510 * @move_from: physical eraseblock from where the data is being moved
 511 * @move_to: physical eraseblock where the data is being moved to
 512 * @move_to_put: if the "to" PEB was put
 513 * @works: list of pending works
 514 * @works_count: count of pending works
 515 * @bgt_thread: background thread description object
 516 * @thread_enabled: if the background thread is enabled
 517 * @bgt_name: background thread name
 518 *
 519 * @flash_size: underlying MTD device size (in bytes)
 520 * @peb_count: count of physical eraseblocks on the MTD device
 521 * @peb_size: physical eraseblock size
 522 * @bad_peb_limit: top limit of expected bad physical eraseblocks
 523 * @bad_peb_count: count of bad physical eraseblocks
 524 * @good_peb_count: count of good physical eraseblocks
 525 * @corr_peb_count: count of corrupted physical eraseblocks (preserved and not
 526 *                  used by UBI)
 527 * @erroneous_peb_count: count of erroneous physical eraseblocks in @erroneous
 528 * @max_erroneous: maximum allowed amount of erroneous physical eraseblocks
 529 * @min_io_size: minimal input/output unit size of the underlying MTD device
 530 * @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers
 531 * @ro_mode: if the UBI device is in read-only mode
 532 * @leb_size: logical eraseblock size
 533 * @leb_start: starting offset of logical eraseblocks within physical
 534 *             eraseblocks
 535 * @ec_hdr_alsize: size of the EC header aligned to @hdrs_min_io_size
 536 * @vid_hdr_alsize: size of the VID header aligned to @hdrs_min_io_size
 537 * @vid_hdr_offset: starting offset of the volume identifier header (might be
 538 *                  unaligned)
 539 * @vid_hdr_aloffset: starting offset of the VID header aligned to
 540 *                    @hdrs_min_io_size
 541 * @vid_hdr_shift: contains @vid_hdr_offset - @vid_hdr_aloffset
 542 * @bad_allowed: whether the MTD device admits bad physical eraseblocks or not
 
 543 * @nor_flash: non-zero if working on top of NOR flash
 544 * @max_write_size: maximum amount of bytes the underlying flash can write at a
 545 *                  time (MTD write buffer size)
 546 * @mtd: MTD device descriptor
 547 *
 548 * @peb_buf: a buffer of PEB size used for different purposes
 549 * @buf_mutex: protects @peb_buf
 550 * @ckvol_mutex: serializes static volume checking when opening
 551 *
 552 * @dbg: debugging information for this UBI device
 553 */
 554struct ubi_device {
 555	struct cdev cdev;
 556	struct device dev;
 557	int ubi_num;
 558	char ubi_name[sizeof(UBI_NAME_STR)+5];
 559	int vol_count;
 560	struct ubi_volume *volumes[UBI_MAX_VOLUMES+UBI_INT_VOL_COUNT];
 561	spinlock_t volumes_lock;
 562	int ref_count;
 563	int image_seq;
 564
 565	int rsvd_pebs;
 566	int avail_pebs;
 567	int beb_rsvd_pebs;
 568	int beb_rsvd_level;
 569	int bad_peb_limit;
 570
 571	int autoresize_vol_id;
 572	int vtbl_slots;
 573	int vtbl_size;
 574	struct ubi_vtbl_record *vtbl;
 575	struct mutex device_mutex;
 576
 577	int max_ec;
 578	/* Note, mean_ec is not updated run-time - should be fixed */
 579	int mean_ec;
 580
 581	/* EBA sub-system's stuff */
 582	unsigned long long global_sqnum;
 583	spinlock_t ltree_lock;
 584	struct rb_root ltree;
 585	struct mutex alc_mutex;
 586
 587	/* Fastmap stuff */
 588	int fm_disabled;
 589	struct ubi_fastmap_layout *fm;
 590	struct ubi_fm_pool fm_pool;
 591	struct ubi_fm_pool fm_wl_pool;
 592	struct rw_semaphore fm_eba_sem;
 593	struct rw_semaphore fm_protect;
 594	void *fm_buf;
 595	size_t fm_size;
 596	struct work_struct fm_work;
 597	int fm_work_scheduled;
 598	int fast_attach;
 599	struct ubi_wl_entry *fm_anchor;
 600	int fm_do_produce_anchor;
 601	int fm_pool_rsv_cnt;
 602
 603	/* Wear-leveling sub-system's stuff */
 604	struct rb_root used;
 605	struct rb_root erroneous;
 606	struct rb_root free;
 607	int free_count;
 608	struct rb_root scrub;
 609	struct list_head pq[UBI_PROT_QUEUE_LEN];
 610	int pq_head;
 611	spinlock_t wl_lock;
 612	struct mutex move_mutex;
 613	struct rw_semaphore work_sem;
 614	int wl_scheduled;
 615	struct ubi_wl_entry **lookuptbl;
 616	struct ubi_wl_entry *move_from;
 617	struct ubi_wl_entry *move_to;
 618	int move_to_put;
 619	struct list_head works;
 620	int works_count;
 621	struct task_struct *bgt_thread;
 622	int thread_enabled;
 623	char bgt_name[sizeof(UBI_BGT_NAME_PATTERN)+2];
 624
 625	/* I/O sub-system's stuff */
 626	long long flash_size;
 627	int peb_count;
 628	int peb_size;
 629	int bad_peb_count;
 630	int good_peb_count;
 631	int corr_peb_count;
 632	int erroneous_peb_count;
 633	int max_erroneous;
 634	int min_io_size;
 635	int hdrs_min_io_size;
 636	int ro_mode;
 637	int leb_size;
 638	int leb_start;
 639	int ec_hdr_alsize;
 640	int vid_hdr_alsize;
 641	int vid_hdr_offset;
 642	int vid_hdr_aloffset;
 643	int vid_hdr_shift;
 644	unsigned int bad_allowed:1;
 645	unsigned int nor_flash:1;
 646	int max_write_size;
 647	struct mtd_info *mtd;
 648
 649	void *peb_buf;
 650	struct mutex buf_mutex;
 651	struct mutex ckvol_mutex;
 652
 653	struct ubi_debug_info dbg;
 654};
 655
 656/**
 657 * struct ubi_ainf_peb - attach information about a physical eraseblock.
 658 * @ec: erase counter (%UBI_UNKNOWN if it is unknown)
 659 * @pnum: physical eraseblock number
 660 * @vol_id: ID of the volume this LEB belongs to
 661 * @lnum: logical eraseblock number
 662 * @scrub: if this physical eraseblock needs scrubbing
 663 * @copy_flag: this LEB is a copy (@copy_flag is set in VID header of this LEB)
 664 * @sqnum: sequence number
 665 * @u: unions RB-tree or @list links
 666 * @u.rb: link in the per-volume RB-tree of &struct ubi_ainf_peb objects
 667 * @u.list: link in one of the eraseblock lists
 668 *
 669 * One object of this type is allocated for each physical eraseblock when
 670 * attaching an MTD device. Note, if this PEB does not belong to any LEB /
 671 * volume, the @vol_id and @lnum fields are initialized to %UBI_UNKNOWN.
 672 */
 673struct ubi_ainf_peb {
 674	int ec;
 675	int pnum;
 676	int vol_id;
 677	int lnum;
 678	unsigned int scrub:1;
 679	unsigned int copy_flag:1;
 680	unsigned long long sqnum;
 681	union {
 682		struct rb_node rb;
 683		struct list_head list;
 684	} u;
 685};
 686
 687/**
 688 * struct ubi_ainf_volume - attaching information about a volume.
 689 * @vol_id: volume ID
 690 * @highest_lnum: highest logical eraseblock number in this volume
 691 * @leb_count: number of logical eraseblocks in this volume
 692 * @vol_type: volume type
 693 * @used_ebs: number of used logical eraseblocks in this volume (only for
 694 *            static volumes)
 695 * @last_data_size: amount of data in the last logical eraseblock of this
 696 *                  volume (always equivalent to the usable logical eraseblock
 697 *                  size in case of dynamic volumes)
 698 * @data_pad: how many bytes at the end of logical eraseblocks of this volume
 699 *            are not used (due to volume alignment)
 700 * @compat: compatibility flags of this volume
 701 * @rb: link in the volume RB-tree
 702 * @root: root of the RB-tree containing all the eraseblock belonging to this
 703 *        volume (&struct ubi_ainf_peb objects)
 704 *
 705 * One object of this type is allocated for each volume when attaching an MTD
 706 * device.
 707 */
 708struct ubi_ainf_volume {
 709	int vol_id;
 710	int highest_lnum;
 711	int leb_count;
 712	int vol_type;
 713	int used_ebs;
 714	int last_data_size;
 715	int data_pad;
 716	int compat;
 717	struct rb_node rb;
 718	struct rb_root root;
 719};
 720
 721/**
 722 * struct ubi_attach_info - MTD device attaching information.
 723 * @volumes: root of the volume RB-tree
 724 * @corr: list of corrupted physical eraseblocks
 725 * @free: list of free physical eraseblocks
 726 * @erase: list of physical eraseblocks which have to be erased
 727 * @alien: list of physical eraseblocks which should not be used by UBI (e.g.,
 728 *         those belonging to "preserve"-compatible internal volumes)
 729 * @fastmap: list of physical eraseblocks which relate to fastmap (e.g.,
 730 *           eraseblocks of the current and not yet erased old fastmap blocks)
 731 * @corr_peb_count: count of PEBs in the @corr list
 732 * @empty_peb_count: count of PEBs which are presumably empty (contain only
 733 *                   0xFF bytes)
 734 * @alien_peb_count: count of PEBs in the @alien list
 735 * @bad_peb_count: count of bad physical eraseblocks
 736 * @maybe_bad_peb_count: count of bad physical eraseblocks which are not marked
 737 *                       as bad yet, but which look like bad
 738 * @vols_found: number of volumes found
 739 * @highest_vol_id: highest volume ID
 740 * @is_empty: flag indicating whether the MTD device is empty or not
 741 * @force_full_scan: flag indicating whether we need to do a full scan and drop
 742		     all existing Fastmap data structures
 743 * @min_ec: lowest erase counter value
 744 * @max_ec: highest erase counter value
 745 * @max_sqnum: highest sequence number value
 746 * @mean_ec: mean erase counter value
 747 * @ec_sum: a temporary variable used when calculating @mean_ec
 748 * @ec_count: a temporary variable used when calculating @mean_ec
 749 * @aeb_slab_cache: slab cache for &struct ubi_ainf_peb objects
 750 * @ech: temporary EC header. Only available during scan
 751 * @vidh: temporary VID buffer. Only available during scan
 752 *
 753 * This data structure contains the result of attaching an MTD device and may
 754 * be used by other UBI sub-systems to build final UBI data structures, further
 755 * error-recovery and so on.
 756 */
 757struct ubi_attach_info {
 758	struct rb_root volumes;
 759	struct list_head corr;
 760	struct list_head free;
 761	struct list_head erase;
 762	struct list_head alien;
 763	struct list_head fastmap;
 764	int corr_peb_count;
 765	int empty_peb_count;
 766	int alien_peb_count;
 767	int bad_peb_count;
 768	int maybe_bad_peb_count;
 769	int vols_found;
 770	int highest_vol_id;
 771	int is_empty;
 772	int force_full_scan;
 773	int min_ec;
 774	int max_ec;
 775	unsigned long long max_sqnum;
 776	int mean_ec;
 777	uint64_t ec_sum;
 778	int ec_count;
 779	struct kmem_cache *aeb_slab_cache;
 780	struct ubi_ec_hdr *ech;
 781	struct ubi_vid_io_buf *vidb;
 782};
 783
 784/**
 785 * struct ubi_work - UBI work description data structure.
 786 * @list: a link in the list of pending works
 787 * @func: worker function
 788 * @e: physical eraseblock to erase
 789 * @vol_id: the volume ID on which this erasure is being performed
 790 * @lnum: the logical eraseblock number
 791 * @torture: if the physical eraseblock has to be tortured
 
 792 *
 793 * The @func pointer points to the worker function. If the @shutdown argument is
 794 * not zero, the worker has to free the resources and exit immediately as the
 795 * WL sub-system is shutting down.
 796 * The worker has to return zero in case of success and a negative error code in
 797 * case of failure.
 798 */
 799struct ubi_work {
 800	struct list_head list;
 801	int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int shutdown);
 802	/* The below fields are only relevant to erasure works */
 803	struct ubi_wl_entry *e;
 804	int vol_id;
 805	int lnum;
 806	int torture;
 
 807};
 808
 809#include "debug.h"
 810
 811extern struct kmem_cache *ubi_wl_entry_slab;
 812extern const struct file_operations ubi_ctrl_cdev_operations;
 813extern const struct file_operations ubi_cdev_operations;
 814extern const struct file_operations ubi_vol_cdev_operations;
 815extern struct class ubi_class;
 816extern struct mutex ubi_devices_mutex;
 817extern struct blocking_notifier_head ubi_notifiers;
 818
 819/* attach.c */
 820struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum,
 821				   int ec);
 822void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb);
 823int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
 824		  int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips);
 825struct ubi_ainf_volume *ubi_add_av(struct ubi_attach_info *ai, int vol_id);
 826struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
 827				    int vol_id);
 828void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av);
 829struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi,
 830				       struct ubi_attach_info *ai);
 831int ubi_attach(struct ubi_device *ubi, int force_scan);
 832void ubi_destroy_ai(struct ubi_attach_info *ai);
 833
 834/* vtbl.c */
 835int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
 836			   struct ubi_vtbl_record *vtbl_rec);
 837int ubi_vtbl_rename_volumes(struct ubi_device *ubi,
 838			    struct list_head *rename_list);
 839int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai);
 840
 841/* vmt.c */
 842int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req);
 843int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl);
 844int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs);
 845int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list);
 846int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol);
 847void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol);
 848
 849/* upd.c */
 850int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
 851		     long long bytes);
 852int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
 853			 const void __user *buf, int count);
 854int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
 855			 const struct ubi_leb_change_req *req);
 856int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
 857			     const void __user *buf, int count);
 858
 859/* misc.c */
 860int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
 861		      int length);
 862int ubi_check_volume(struct ubi_device *ubi, int vol_id);
 863void ubi_update_reserved(struct ubi_device *ubi);
 864void ubi_calculate_reserved(struct ubi_device *ubi);
 865int ubi_check_pattern(const void *buf, uint8_t patt, int size);
 866
 867static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum)
 868{
 869	return lnum >= 0 && lnum < vol->reserved_pebs;
 870}
 871
 872/* eba.c */
 873struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol,
 874					   int nentries);
 875void ubi_eba_destroy_table(struct ubi_eba_table *tbl);
 876void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst,
 877			int nentries);
 878void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl);
 879void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum,
 880		       struct ubi_eba_leb_desc *ldesc);
 881bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum);
 882int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
 883		      int lnum);
 884int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
 885		     void *buf, int offset, int len, int check);
 886int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol,
 887			struct ubi_sgl *sgl, int lnum, int offset, int len,
 888			int check);
 889int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
 890		      const void *buf, int offset, int len);
 891int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
 892			 int lnum, const void *buf, int len, int used_ebs);
 893int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
 894			      int lnum, const void *buf, int len);
 895int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
 896		     struct ubi_vid_io_buf *vidb);
 897int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
 898unsigned long long ubi_next_sqnum(struct ubi_device *ubi);
 899int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
 900		   struct ubi_attach_info *ai_scan);
 901
 902/* wl.c */
 903int ubi_sync_erase(struct ubi_device *ubi, struct ubi_wl_entry *e, int torture);
 904int ubi_wl_get_peb(struct ubi_device *ubi);
 905int ubi_wl_put_peb(struct ubi_device *ubi, int vol_id, int lnum,
 906		   int pnum, int torture);
 907int ubi_wl_flush(struct ubi_device *ubi, int vol_id, int lnum);
 908int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum);
 909int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
 910void ubi_wl_close(struct ubi_device *ubi);
 911int ubi_thread(void *u);
 912struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor);
 913int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *used_e,
 914		      int lnum, int torture);
 915int ubi_is_erase_work(struct ubi_work *wrk);
 916void ubi_refill_pools_and_lock(struct ubi_device *ubi);
 917int ubi_ensure_anchor_pebs(struct ubi_device *ubi);
 918int ubi_bitflip_check(struct ubi_device *ubi, int pnum, int force_scrub);
 919
 920/* io.c */
 921int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
 922		int len);
 923int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
 924		 int len);
 925int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture);
 926int ubi_io_is_bad(const struct ubi_device *ubi, int pnum);
 927int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum);
 928int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
 929		       struct ubi_ec_hdr *ec_hdr, int verbose);
 930int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
 931			struct ubi_ec_hdr *ec_hdr);
 932int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
 933			struct ubi_vid_io_buf *vidb, int verbose);
 934int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
 935			 struct ubi_vid_io_buf *vidb);
 936
 937/* build.c */
 938int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
 939		       int vid_hdr_offset, int max_beb_per1024,
 940		       bool disable_fm, bool need_resv_pool);
 941int ubi_detach_mtd_dev(int ubi_num, int anyway);
 942struct ubi_device *ubi_get_device(int ubi_num);
 943void ubi_put_device(struct ubi_device *ubi);
 944struct ubi_device *ubi_get_by_major(int major);
 945int ubi_major2num(int major);
 946int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol,
 947		      int ntype);
 948int ubi_notify_all(struct ubi_device *ubi, int ntype,
 949		   struct notifier_block *nb);
 950int ubi_enumerate_volumes(struct notifier_block *nb);
 951void ubi_free_all_volumes(struct ubi_device *ubi);
 952void ubi_free_internal_volumes(struct ubi_device *ubi);
 953
 954/* kapi.c */
 955void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di);
 956void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
 957			    struct ubi_volume_info *vi);
 958/* scan.c */
 959int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
 960		      int pnum, const struct ubi_vid_hdr *vid_hdr);
 961
 962/* fastmap.c */
 963#ifdef CONFIG_MTD_UBI_FASTMAP
 964size_t ubi_calc_fm_size(struct ubi_device *ubi);
 965int ubi_update_fastmap(struct ubi_device *ubi);
 966int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
 967		     struct ubi_attach_info *scan_ai);
 968int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count);
 969void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol);
 970#else
 971static inline int ubi_update_fastmap(struct ubi_device *ubi) { return 0; }
 972static inline int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count) { return 0; }
 973static inline void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol) {}
 974#endif
 975
 976/* block.c */
 977#ifdef CONFIG_MTD_UBI_BLOCK
 978int ubiblock_init(void);
 979void ubiblock_exit(void);
 980int ubiblock_create(struct ubi_volume_info *vi);
 981int ubiblock_remove(struct ubi_volume_info *vi);
 982#else
 983static inline int ubiblock_init(void) { return 0; }
 984static inline void ubiblock_exit(void) {}
 985static inline int ubiblock_create(struct ubi_volume_info *vi)
 986{
 987	return -ENOSYS;
 988}
 989static inline int ubiblock_remove(struct ubi_volume_info *vi)
 990{
 991	return -ENOSYS;
 992}
 993#endif
 994
 995/*
 996 * ubi_for_each_free_peb - walk the UBI free RB tree.
 997 * @ubi: UBI device description object
 998 * @e: a pointer to a ubi_wl_entry to use as cursor
 999 * @pos: a pointer to RB-tree entry type to use as a loop counter
1000 */
1001#define ubi_for_each_free_peb(ubi, e, tmp_rb)	\
1002	ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->free, u.rb)
1003
1004/*
1005 * ubi_for_each_used_peb - walk the UBI used RB tree.
1006 * @ubi: UBI device description object
1007 * @e: a pointer to a ubi_wl_entry to use as cursor
1008 * @pos: a pointer to RB-tree entry type to use as a loop counter
1009 */
1010#define ubi_for_each_used_peb(ubi, e, tmp_rb)	\
1011	ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->used, u.rb)
1012
1013/*
1014 * ubi_for_each_scub_peb - walk the UBI scub RB tree.
1015 * @ubi: UBI device description object
1016 * @e: a pointer to a ubi_wl_entry to use as cursor
1017 * @pos: a pointer to RB-tree entry type to use as a loop counter
1018 */
1019#define ubi_for_each_scrub_peb(ubi, e, tmp_rb)	\
1020	ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->scrub, u.rb)
1021
1022/*
1023 * ubi_for_each_protected_peb - walk the UBI protection queue.
1024 * @ubi: UBI device description object
1025 * @i: a integer used as counter
1026 * @e: a pointer to a ubi_wl_entry to use as cursor
1027 */
1028#define ubi_for_each_protected_peb(ubi, i, e)	\
1029	for ((i) = 0; (i) < UBI_PROT_QUEUE_LEN; (i)++)	\
1030		list_for_each_entry((e), &(ubi->pq[(i)]), u.list)
1031
1032/*
1033 * ubi_rb_for_each_entry - walk an RB-tree.
1034 * @rb: a pointer to type 'struct rb_node' to use as a loop counter
1035 * @pos: a pointer to RB-tree entry type to use as a loop counter
1036 * @root: RB-tree's root
1037 * @member: the name of the 'struct rb_node' within the RB-tree entry
1038 */
1039#define ubi_rb_for_each_entry(rb, pos, root, member)                         \
1040	for (rb = rb_first(root),                                            \
1041	     pos = (rb ? container_of(rb, typeof(*pos), member) : NULL);     \
1042	     rb;                                                             \
1043	     rb = rb_next(rb),                                               \
1044	     pos = (rb ? container_of(rb, typeof(*pos), member) : NULL))
1045
1046/*
1047 * ubi_move_aeb_to_list - move a PEB from the volume tree to a list.
1048 *
1049 * @av: volume attaching information
1050 * @aeb: attaching eraseblock information
1051 * @list: the list to move to
1052 */
1053static inline void ubi_move_aeb_to_list(struct ubi_ainf_volume *av,
1054					 struct ubi_ainf_peb *aeb,
1055					 struct list_head *list)
1056{
1057		rb_erase(&aeb->u.rb, &av->root);
1058		list_add_tail(&aeb->u.list, list);
1059}
1060
1061/**
1062 * ubi_init_vid_buf - Initialize a VID buffer
1063 * @ubi: the UBI device
1064 * @vidb: the VID buffer to initialize
1065 * @buf: the underlying buffer
1066 */
1067static inline void ubi_init_vid_buf(const struct ubi_device *ubi,
1068				    struct ubi_vid_io_buf *vidb,
1069				    void *buf)
1070{
1071	if (buf)
1072		memset(buf, 0, ubi->vid_hdr_alsize);
1073
1074	vidb->buffer = buf;
1075	vidb->hdr = buf + ubi->vid_hdr_shift;
1076}
1077
1078/**
1079 * ubi_init_vid_buf - Allocate a VID buffer
1080 * @ubi: the UBI device
1081 * @gfp_flags: GFP flags to use for the allocation
1082 */
1083static inline struct ubi_vid_io_buf *
1084ubi_alloc_vid_buf(const struct ubi_device *ubi, gfp_t gfp_flags)
1085{
1086	struct ubi_vid_io_buf *vidb;
1087	void *buf;
1088
1089	vidb = kzalloc(sizeof(*vidb), gfp_flags);
1090	if (!vidb)
1091		return NULL;
1092
1093	buf = kmalloc(ubi->vid_hdr_alsize, gfp_flags);
1094	if (!buf) {
1095		kfree(vidb);
1096		return NULL;
1097	}
1098
1099	ubi_init_vid_buf(ubi, vidb, buf);
1100
1101	return vidb;
1102}
1103
1104/**
1105 * ubi_free_vid_buf - Free a VID buffer
1106 * @vidb: the VID buffer to free
1107 */
1108static inline void ubi_free_vid_buf(struct ubi_vid_io_buf *vidb)
1109{
1110	if (!vidb)
1111		return;
1112
1113	kfree(vidb->buffer);
1114	kfree(vidb);
1115}
1116
1117/**
1118 * ubi_get_vid_hdr - Get the VID header attached to a VID buffer
1119 * @vidb: VID buffer
1120 */
1121static inline struct ubi_vid_hdr *ubi_get_vid_hdr(struct ubi_vid_io_buf *vidb)
1122{
1123	return vidb->hdr;
1124}
1125
1126/**
1127 * ubi_ro_mode - switch to read-only mode.
1128 * @ubi: UBI device description object
1129 */
1130static inline void ubi_ro_mode(struct ubi_device *ubi)
1131{
1132	if (!ubi->ro_mode) {
1133		ubi->ro_mode = 1;
1134		ubi_warn(ubi, "switch to read-only mode");
1135		dump_stack();
1136	}
1137}
1138
1139/*
1140 * This function is equivalent to 'ubi_io_read()', but @offset is relative to
1141 * the beginning of the logical eraseblock, not to the beginning of the
1142 * physical eraseblock.
1143 */
1144static inline int ubi_io_read_data(const struct ubi_device *ubi, void *buf,
1145				   int pnum, int offset, int len)
1146{
1147	ubi_assert(offset >= 0);
1148	return ubi_io_read(ubi, buf, pnum, offset + ubi->leb_start, len);
1149}
1150
1151/*
1152 * This function is equivalent to 'ubi_io_write()', but @offset is relative to
1153 * the beginning of the logical eraseblock, not to the beginning of the
1154 * physical eraseblock.
1155 */
1156static inline int ubi_io_write_data(struct ubi_device *ubi, const void *buf,
1157				    int pnum, int offset, int len)
1158{
1159	ubi_assert(offset >= 0);
 
 
1160
1161	if (ubi_dbg_power_cut(ubi, MASK_POWER_CUT_DATA)) {
1162		ubi_warn(ubi, "XXXXX emulating a power cut when writing data XXXXX");
1163		ubi_ro_mode(ubi);
1164		return -EROFS;
 
 
 
 
 
 
1165	}
1166	return ubi_io_write(ubi, buf, pnum, offset + ubi->leb_start, len);
1167}
1168
1169/**
1170 * vol_id2idx - get table index by volume ID.
1171 * @ubi: UBI device description object
1172 * @vol_id: volume ID
1173 */
1174static inline int vol_id2idx(const struct ubi_device *ubi, int vol_id)
1175{
1176	if (vol_id >= UBI_INTERNAL_VOL_START)
1177		return vol_id - UBI_INTERNAL_VOL_START + ubi->vtbl_slots;
1178	else
1179		return vol_id;
1180}
1181
1182/**
1183 * idx2vol_id - get volume ID by table index.
1184 * @ubi: UBI device description object
1185 * @idx: table index
1186 */
1187static inline int idx2vol_id(const struct ubi_device *ubi, int idx)
1188{
1189	if (idx >= ubi->vtbl_slots)
1190		return idx - ubi->vtbl_slots + UBI_INTERNAL_VOL_START;
1191	else
1192		return idx;
1193}
1194
1195/**
1196 * ubi_is_fm_vol - check whether a volume ID is a Fastmap volume.
1197 * @vol_id: volume ID
1198 */
1199static inline bool ubi_is_fm_vol(int vol_id)
1200{
1201	switch (vol_id) {
1202		case UBI_FM_SB_VOLUME_ID:
1203		case UBI_FM_DATA_VOLUME_ID:
1204		return true;
1205	}
1206
1207	return false;
1208}
1209
1210/**
1211 * ubi_find_fm_block - check whether a PEB is part of the current Fastmap.
1212 * @ubi: UBI device description object
1213 * @pnum: physical eraseblock to look for
1214 *
1215 * This function returns a wear leveling object if @pnum relates to the current
1216 * fastmap, @NULL otherwise.
1217 */
1218static inline struct ubi_wl_entry *ubi_find_fm_block(const struct ubi_device *ubi,
1219						     int pnum)
1220{
1221	int i;
1222
1223	if (ubi->fm) {
1224		for (i = 0; i < ubi->fm->used_blocks; i++) {
1225			if (ubi->fm->e[i]->pnum == pnum)
1226				return ubi->fm->e[i];
1227		}
1228	}
1229
1230	return NULL;
1231}
1232
1233#endif /* !__UBI_UBI_H__ */