2 * Copyright (c) International Business Machines Corp., 2006
3 * Copyright (c) Nokia Corporation, 2006, 2007
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * Author: Artem Bityutskiy (Битюцкий Артём)
25 #include <linux/types.h>
26 #include <linux/list.h>
27 #include <linux/rbtree.h>
28 #include <linux/sched.h>
29 #include <linux/wait.h>
30 #include <linux/mutex.h>
31 #include <linux/rwsem.h>
32 #include <linux/spinlock.h>
34 #include <linux/cdev.h>
35 #include <linux/device.h>
36 #include <linux/slab.h>
37 #include <linux/string.h>
38 #include <linux/vmalloc.h>
39 #include <linux/notifier.h>
40 #include <linux/mtd/mtd.h>
41 #include <linux/mtd/ubi.h>
42 #include <asm/pgtable.h>
44 #include "ubi-media.h"
46 /* Maximum number of supported UBI devices */
47 #define UBI_MAX_DEVICES 32
49 /* UBI name used for character devices, sysfs, etc */
50 #define UBI_NAME_STR "ubi"
54 /* Normal UBI messages */
56 void ubi_msg(const struct ubi_device *ubi, const char *fmt, ...);
58 /* UBI warning messages */
60 void ubi_warn(const struct ubi_device *ubi, const char *fmt, ...);
62 /* UBI error messages */
64 void ubi_err(const struct ubi_device *ubi, const char *fmt, ...);
66 /* Background thread name pattern */
67 #define UBI_BGT_NAME_PATTERN "ubi_bgt%dd"
70 * This marker in the EBA table means that the LEB is um-mapped.
71 * NOTE! It has to have the same value as %UBI_ALL.
73 #define UBI_LEB_UNMAPPED -1
76 * In case of errors, UBI tries to repeat the operation several times before
77 * returning error. The below constant defines how many times UBI re-tries.
79 #define UBI_IO_RETRIES 3
82 * Length of the protection queue. The length is effectively equivalent to the
83 * number of (global) erase cycles PEBs are protected from the wear-leveling
86 #define UBI_PROT_QUEUE_LEN 10
88 /* The volume ID/LEB number/erase counter is unknown */
89 #define UBI_UNKNOWN -1
92 * The UBI debugfs directory name pattern and maximum name length (3 for "ubi"
93 * + 2 for the number plus 1 for the trailing zero byte.
95 #define UBI_DFS_DIR_NAME "ubi%d"
96 #define UBI_DFS_DIR_LEN (3 + 2 + 1)
99 * Error codes returned by the I/O sub-system.
101 * UBI_IO_FF: the read region of flash contains only 0xFFs
102 * UBI_IO_FF_BITFLIPS: the same as %UBI_IO_FF, but also also there was a data
103 * integrity error reported by the MTD driver
104 * (uncorrectable ECC error in case of NAND)
105 * UBI_IO_BAD_HDR: the EC or VID header is corrupted (bad magic or CRC)
106 * UBI_IO_BAD_HDR_EBADMSG: the same as %UBI_IO_BAD_HDR, but also there was a
107 * data integrity error reported by the MTD driver
108 * (uncorrectable ECC error in case of NAND)
109 * UBI_IO_BITFLIPS: bit-flips were detected and corrected
111 * Note, it is probably better to have bit-flip and ebadmsg as flags which can
112 * be or'ed with other error code. But this is a big change because there are
113 * may callers, so it does not worth the risk of introducing a bug
119 UBI_IO_BAD_HDR_EBADMSG,
124 * Return codes of the 'ubi_eba_copy_leb()' function.
126 * MOVE_CANCEL_RACE: canceled because the volume is being deleted, the source
127 * PEB was put meanwhile, or there is I/O on the source PEB
128 * MOVE_SOURCE_RD_ERR: canceled because there was a read error from the source
130 * MOVE_TARGET_RD_ERR: canceled because there was a read error from the target
132 * MOVE_TARGET_WR_ERR: canceled because there was a write error to the target
134 * MOVE_TARGET_BITFLIPS: canceled because a bit-flip was detected in the
136 * MOVE_RETRY: retry scrubbing the PEB
139 MOVE_CANCEL_RACE = 1,
143 MOVE_TARGET_BITFLIPS,
148 * Return codes of the fastmap sub-system
150 * UBI_NO_FASTMAP: No fastmap super block was found
151 * UBI_BAD_FASTMAP: A fastmap was found but it's unusable
159 * Flags for emulate_power_cut in ubi_debug_info
161 * POWER_CUT_EC_WRITE: Emulate a power cut when writing an EC header
162 * POWER_CUT_VID_WRITE: Emulate a power cut when writing a VID header
165 POWER_CUT_EC_WRITE = 0x01,
166 POWER_CUT_VID_WRITE = 0x02,
170 * struct ubi_wl_entry - wear-leveling entry.
171 * @u.rb: link in the corresponding (free/used) RB-tree
172 * @u.list: link in the protection queue
174 * @pnum: physical eraseblock number
176 * This data structure is used in the WL sub-system. Each physical eraseblock
177 * has a corresponding &struct wl_entry object which may be kept in different
178 * RB-trees. See WL sub-system for details.
180 struct ubi_wl_entry {
183 struct list_head list;
190 * struct ubi_ltree_entry - an entry in the lock tree.
191 * @rb: links RB-tree nodes
192 * @vol_id: volume ID of the locked logical eraseblock
193 * @lnum: locked logical eraseblock number
194 * @users: how many tasks are using this logical eraseblock or wait for it
195 * @mutex: read/write mutex to implement read/write access serialization to
196 * the (@vol_id, @lnum) logical eraseblock
198 * This data structure is used in the EBA sub-system to implement per-LEB
199 * locking. When a logical eraseblock is being locked - corresponding
200 * &struct ubi_ltree_entry object is inserted to the lock tree (@ubi->ltree).
201 * See EBA sub-system for details.
203 struct ubi_ltree_entry {
208 struct rw_semaphore mutex;
212 * struct ubi_rename_entry - volume re-name description data structure.
213 * @new_name_len: new volume name length
214 * @new_name: new volume name
215 * @remove: if not zero, this volume should be removed, not re-named
216 * @desc: descriptor of the volume
217 * @list: links re-name entries into a list
219 * This data structure is utilized in the multiple volume re-name code. Namely,
220 * UBI first creates a list of &struct ubi_rename_entry objects from the
221 * &struct ubi_rnvol_req request object, and then utilizes this list to do all
224 struct ubi_rename_entry {
226 char new_name[UBI_VOL_NAME_MAX + 1];
228 struct ubi_volume_desc *desc;
229 struct list_head list;
232 struct ubi_volume_desc;
235 * struct ubi_fastmap_layout - in-memory fastmap data structure.
236 * @e: PEBs used by the current fastmap
237 * @to_be_tortured: if non-zero tortured this PEB
238 * @used_blocks: number of used PEBs
239 * @max_pool_size: maximal size of the user pool
240 * @max_wl_pool_size: maximal size of the pool used by the WL sub-system
242 struct ubi_fastmap_layout {
243 struct ubi_wl_entry *e[UBI_FM_MAX_BLOCKS];
244 int to_be_tortured[UBI_FM_MAX_BLOCKS];
247 int max_wl_pool_size;
251 * struct ubi_fm_pool - in-memory fastmap pool
252 * @pebs: PEBs in this pool
253 * @used: number of used PEBs
254 * @size: total number of PEBs in this pool
255 * @max_size: maximal size of the pool
257 * A pool gets filled with up to max_size.
258 * If all PEBs within the pool are used a new fastmap will be written
259 * to the flash and the pool gets refilled with empty PEBs.
263 int pebs[UBI_FM_MAX_POOL_SIZE];
270 * struct ubi_eba_leb_desc - EBA logical eraseblock descriptor
271 * @lnum: the logical eraseblock number
272 * @pnum: the physical eraseblock where the LEB can be found
274 * This structure is here to hide EBA's internal from other part of the
275 * UBI implementation.
277 * One can query the position of a LEB by calling ubi_eba_get_ldesc().
279 struct ubi_eba_leb_desc {
285 * struct ubi_volume - UBI volume description data structure.
286 * @dev: device object to make use of the the Linux device model
287 * @cdev: character device object to create character device
288 * @ubi: reference to the UBI device description object
290 * @ref_count: volume reference count
291 * @readers: number of users holding this volume in read-only mode
292 * @writers: number of users holding this volume in read-write mode
293 * @exclusive: whether somebody holds this volume in exclusive mode
294 * @metaonly: whether somebody is altering only meta data of this volume
296 * @reserved_pebs: how many physical eraseblocks are reserved for this volume
297 * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME)
298 * @usable_leb_size: logical eraseblock size without padding
299 * @used_ebs: how many logical eraseblocks in this volume contain data
300 * @last_eb_bytes: how many bytes are stored in the last logical eraseblock
301 * @used_bytes: how many bytes of data this volume contains
302 * @alignment: volume alignment
303 * @data_pad: how many bytes are not used at the end of physical eraseblocks to
304 * satisfy the requested alignment
305 * @name_len: volume name length
308 * @upd_ebs: how many eraseblocks are expected to be updated
309 * @ch_lnum: LEB number which is being changing by the atomic LEB change
311 * @upd_bytes: how many bytes are expected to be received for volume update or
313 * @upd_received: how many bytes were already received for volume update or
315 * @upd_buf: update buffer which is used to collect update data or data for
318 * @eba_tbl: EBA table of this volume (LEB->PEB mapping)
319 * @checked: %1 if this static volume was checked
320 * @corrupted: %1 if the volume is corrupted (static volumes only)
321 * @upd_marker: %1 if the update marker is set for this volume
322 * @updating: %1 if the volume is being updated
323 * @changing_leb: %1 if the atomic LEB change ioctl command is in progress
324 * @direct_writes: %1 if direct writes are enabled for this volume
326 * The @corrupted field indicates that the volume's contents is corrupted.
327 * Since UBI protects only static volumes, this field is not relevant to
328 * dynamic volumes - it is user's responsibility to assure their data
331 * The @upd_marker flag indicates that this volume is either being updated at
332 * the moment or is damaged because of an unclean reboot.
337 struct ubi_device *ubi;
350 long long used_bytes;
354 char name[UBI_VOL_NAME_MAX + 1];
359 long long upd_received;
362 struct ubi_eba_table *eba_tbl;
363 unsigned int checked:1;
364 unsigned int corrupted:1;
365 unsigned int upd_marker:1;
366 unsigned int updating:1;
367 unsigned int changing_leb:1;
368 unsigned int direct_writes:1;
372 * struct ubi_volume_desc - UBI volume descriptor returned when it is opened.
373 * @vol: reference to the corresponding volume description object
374 * @mode: open mode (%UBI_READONLY, %UBI_READWRITE, %UBI_EXCLUSIVE
377 struct ubi_volume_desc {
378 struct ubi_volume *vol;
385 * struct ubi_debug_info - debugging information for an UBI device.
387 * @chk_gen: if UBI general extra checks are enabled
388 * @chk_io: if UBI I/O extra checks are enabled
389 * @chk_fastmap: if UBI fastmap extra checks are enabled
390 * @disable_bgt: disable the background task for testing purposes
391 * @emulate_bitflips: emulate bit-flips for testing purposes
392 * @emulate_io_failures: emulate write/erase failures for testing purposes
393 * @emulate_power_cut: emulate power cut for testing purposes
394 * @power_cut_counter: count down for writes left until emulated power cut
395 * @power_cut_min: minimum number of writes before emulating a power cut
396 * @power_cut_max: maximum number of writes until emulating a power cut
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
409 struct ubi_debug_info {
410 unsigned int chk_gen:1;
411 unsigned int chk_io:1;
412 unsigned int chk_fastmap:1;
413 unsigned int disable_bgt:1;
414 unsigned int emulate_bitflips:1;
415 unsigned int emulate_io_failures:1;
416 unsigned int emulate_power_cut:2;
417 unsigned int power_cut_counter;
418 unsigned int power_cut_min;
419 unsigned int power_cut_max;
420 char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
421 struct dentry *dfs_dir;
422 struct dentry *dfs_chk_gen;
423 struct dentry *dfs_chk_io;
424 struct dentry *dfs_chk_fastmap;
425 struct dentry *dfs_disable_bgt;
426 struct dentry *dfs_emulate_bitflips;
427 struct dentry *dfs_emulate_io_failures;
428 struct dentry *dfs_emulate_power_cut;
429 struct dentry *dfs_power_cut_min;
430 struct dentry *dfs_power_cut_max;
434 * struct ubi_device - UBI device description structure
435 * @dev: UBI device object to use the the Linux device model
436 * @cdev: character device object to create character device
437 * @ubi_num: UBI device number
438 * @ubi_name: UBI device name
439 * @vol_count: number of volumes in this UBI device
440 * @volumes: volumes of this UBI device
441 * @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs,
442 * @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count,
443 * @vol->readers, @vol->writers, @vol->exclusive,
444 * @vol->metaonly, @vol->ref_count, @vol->mapping and
446 * @ref_count: count of references on the UBI device
447 * @image_seq: image sequence number recorded on EC headers
449 * @rsvd_pebs: count of reserved physical eraseblocks
450 * @avail_pebs: count of available physical eraseblocks
451 * @beb_rsvd_pebs: how many physical eraseblocks are reserved for bad PEB
453 * @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling
455 * @autoresize_vol_id: ID of the volume which has to be auto-resized at the end
456 * of UBI initialization
457 * @vtbl_slots: how many slots are available in the volume table
458 * @vtbl_size: size of the volume table in bytes
459 * @vtbl: in-RAM volume table copy
460 * @device_mutex: protects on-flash volume table and serializes volume
461 * creation, deletion, update, re-size, re-name and set
464 * @max_ec: current highest erase counter value
465 * @mean_ec: current mean erase counter value
467 * @global_sqnum: global sequence number
468 * @ltree_lock: protects the lock tree and @global_sqnum
469 * @ltree: the lock tree
470 * @alc_mutex: serializes "atomic LEB change" operations
472 * @fm_disabled: non-zero if fastmap is disabled (default)
473 * @fm: in-memory data structure of the currently used fastmap
474 * @fm_pool: in-memory data structure of the fastmap pool
475 * @fm_wl_pool: in-memory data structure of the fastmap pool used by the WL
477 * @fm_protect: serializes ubi_update_fastmap(), protects @fm_buf and makes sure
478 * that critical sections cannot be interrupted by ubi_update_fastmap()
479 * @fm_buf: vmalloc()'d buffer which holds the raw fastmap
480 * @fm_size: fastmap size in bytes
481 * @fm_eba_sem: allows ubi_update_fastmap() to block EBA table changes
482 * @fm_work: fastmap work queue
483 * @fm_work_scheduled: non-zero if fastmap work was scheduled
484 * @fast_attach: non-zero if UBI was attached by fastmap
486 * @used: RB-tree of used physical eraseblocks
487 * @erroneous: RB-tree of erroneous used physical eraseblocks
488 * @free: RB-tree of free physical eraseblocks
489 * @free_count: Contains the number of elements in @free
490 * @scrub: RB-tree of physical eraseblocks which need scrubbing
491 * @pq: protection queue (contain physical eraseblocks which are temporarily
492 * protected from the wear-leveling worker)
493 * @pq_head: protection queue head
494 * @wl_lock: protects the @used, @free, @pq, @pq_head, @lookuptbl, @move_from,
495 * @move_to, @move_to_put @erase_pending, @wl_scheduled, @works,
496 * @erroneous, @erroneous_peb_count, @fm_work_scheduled, @fm_pool,
497 * and @fm_wl_pool fields
498 * @move_mutex: serializes eraseblock moves
499 * @work_sem: used to wait for all the scheduled works to finish and prevent
500 * new works from being submitted
501 * @wl_scheduled: non-zero if the wear-leveling was scheduled
502 * @lookuptbl: a table to quickly find a &struct ubi_wl_entry object for any
503 * physical eraseblock
504 * @move_from: physical eraseblock from where the data is being moved
505 * @move_to: physical eraseblock where the data is being moved to
506 * @move_to_put: if the "to" PEB was put
507 * @works: list of pending works
508 * @works_count: count of pending works
509 * @bgt_thread: background thread description object
510 * @thread_enabled: if the background thread is enabled
511 * @bgt_name: background thread name
513 * @flash_size: underlying MTD device size (in bytes)
514 * @peb_count: count of physical eraseblocks on the MTD device
515 * @peb_size: physical eraseblock size
516 * @bad_peb_limit: top limit of expected bad physical eraseblocks
517 * @bad_peb_count: count of bad physical eraseblocks
518 * @good_peb_count: count of good physical eraseblocks
519 * @corr_peb_count: count of corrupted physical eraseblocks (preserved and not
521 * @erroneous_peb_count: count of erroneous physical eraseblocks in @erroneous
522 * @max_erroneous: maximum allowed amount of erroneous physical eraseblocks
523 * @min_io_size: minimal input/output unit size of the underlying MTD device
524 * @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers
525 * @ro_mode: if the UBI device is in read-only mode
526 * @leb_size: logical eraseblock size
527 * @leb_start: starting offset of logical eraseblocks within physical
529 * @ec_hdr_alsize: size of the EC header aligned to @hdrs_min_io_size
530 * @vid_hdr_alsize: size of the VID header aligned to @hdrs_min_io_size
531 * @vid_hdr_offset: starting offset of the volume identifier header (might be
533 * @vid_hdr_aloffset: starting offset of the VID header aligned to
535 * @vid_hdr_shift: contains @vid_hdr_offset - @vid_hdr_aloffset
536 * @bad_allowed: whether the MTD device admits of bad physical eraseblocks or
538 * @nor_flash: non-zero if working on top of NOR flash
539 * @max_write_size: maximum amount of bytes the underlying flash can write at a
540 * time (MTD write buffer size)
541 * @mtd: MTD device descriptor
543 * @peb_buf: a buffer of PEB size used for different purposes
544 * @buf_mutex: protects @peb_buf
545 * @ckvol_mutex: serializes static volume checking when opening
547 * @dbg: debugging information for this UBI device
553 char ubi_name[sizeof(UBI_NAME_STR)+5];
555 struct ubi_volume *volumes[UBI_MAX_VOLUMES+UBI_INT_VOL_COUNT];
556 spinlock_t volumes_lock;
566 int autoresize_vol_id;
569 struct ubi_vtbl_record *vtbl;
570 struct mutex device_mutex;
573 /* Note, mean_ec is not updated run-time - should be fixed */
576 /* EBA sub-system's stuff */
577 unsigned long long global_sqnum;
578 spinlock_t ltree_lock;
579 struct rb_root ltree;
580 struct mutex alc_mutex;
584 struct ubi_fastmap_layout *fm;
585 struct ubi_fm_pool fm_pool;
586 struct ubi_fm_pool fm_wl_pool;
587 struct rw_semaphore fm_eba_sem;
588 struct rw_semaphore fm_protect;
591 struct work_struct fm_work;
592 int fm_work_scheduled;
595 /* Wear-leveling sub-system's stuff */
597 struct rb_root erroneous;
600 struct rb_root scrub;
601 struct list_head pq[UBI_PROT_QUEUE_LEN];
604 struct mutex move_mutex;
605 struct rw_semaphore work_sem;
607 struct ubi_wl_entry **lookuptbl;
608 struct ubi_wl_entry *move_from;
609 struct ubi_wl_entry *move_to;
611 struct list_head works;
613 struct task_struct *bgt_thread;
615 char bgt_name[sizeof(UBI_BGT_NAME_PATTERN)+2];
617 /* I/O sub-system's stuff */
618 long long flash_size;
624 int erroneous_peb_count;
627 int hdrs_min_io_size;
634 int vid_hdr_aloffset;
636 unsigned int bad_allowed:1;
637 unsigned int nor_flash:1;
639 struct mtd_info *mtd;
642 struct mutex buf_mutex;
643 struct mutex ckvol_mutex;
645 struct ubi_debug_info dbg;
649 * struct ubi_ainf_peb - attach information about a physical eraseblock.
650 * @ec: erase counter (%UBI_UNKNOWN if it is unknown)
651 * @pnum: physical eraseblock number
652 * @vol_id: ID of the volume this LEB belongs to
653 * @lnum: logical eraseblock number
654 * @scrub: if this physical eraseblock needs scrubbing
655 * @copy_flag: this LEB is a copy (@copy_flag is set in VID header of this LEB)
656 * @sqnum: sequence number
657 * @u: unions RB-tree or @list links
658 * @u.rb: link in the per-volume RB-tree of &struct ubi_ainf_peb objects
659 * @u.list: link in one of the eraseblock lists
661 * One object of this type is allocated for each physical eraseblock when
662 * attaching an MTD device. Note, if this PEB does not belong to any LEB /
663 * volume, the @vol_id and @lnum fields are initialized to %UBI_UNKNOWN.
665 struct ubi_ainf_peb {
670 unsigned int scrub:1;
671 unsigned int copy_flag:1;
672 unsigned long long sqnum;
675 struct list_head list;
680 * struct ubi_ainf_volume - attaching information about a volume.
682 * @highest_lnum: highest logical eraseblock number in this volume
683 * @leb_count: number of logical eraseblocks in this volume
684 * @vol_type: volume type
685 * @used_ebs: number of used logical eraseblocks in this volume (only for
687 * @last_data_size: amount of data in the last logical eraseblock of this
688 * volume (always equivalent to the usable logical eraseblock
689 * size in case of dynamic volumes)
690 * @data_pad: how many bytes at the end of logical eraseblocks of this volume
691 * are not used (due to volume alignment)
692 * @compat: compatibility flags of this volume
693 * @rb: link in the volume RB-tree
694 * @root: root of the RB-tree containing all the eraseblock belonging to this
695 * volume (&struct ubi_ainf_peb objects)
697 * One object of this type is allocated for each volume when attaching an MTD
700 struct ubi_ainf_volume {
714 * struct ubi_attach_info - MTD device attaching information.
715 * @volumes: root of the volume RB-tree
716 * @corr: list of corrupted physical eraseblocks
717 * @free: list of free physical eraseblocks
718 * @erase: list of physical eraseblocks which have to be erased
719 * @alien: list of physical eraseblocks which should not be used by UBI (e.g.,
720 * those belonging to "preserve"-compatible internal volumes)
721 * @fastmap: list of physical eraseblocks which relate to fastmap (e.g.,
722 * eraseblocks of the current and not yet erased old fastmap blocks)
723 * @corr_peb_count: count of PEBs in the @corr list
724 * @empty_peb_count: count of PEBs which are presumably empty (contain only
726 * @alien_peb_count: count of PEBs in the @alien list
727 * @bad_peb_count: count of bad physical eraseblocks
728 * @maybe_bad_peb_count: count of bad physical eraseblocks which are not marked
729 * as bad yet, but which look like bad
730 * @vols_found: number of volumes found
731 * @highest_vol_id: highest volume ID
732 * @is_empty: flag indicating whether the MTD device is empty or not
733 * @force_full_scan: flag indicating whether we need to do a full scan and drop
734 all existing Fastmap data structures
735 * @min_ec: lowest erase counter value
736 * @max_ec: highest erase counter value
737 * @max_sqnum: highest sequence number value
738 * @mean_ec: mean erase counter value
739 * @ec_sum: a temporary variable used when calculating @mean_ec
740 * @ec_count: a temporary variable used when calculating @mean_ec
741 * @aeb_slab_cache: slab cache for &struct ubi_ainf_peb objects
742 * @ech: temporary EC header. Only available during scan
743 * @vidh: temporary VID header. Only available during scan
745 * This data structure contains the result of attaching an MTD device and may
746 * be used by other UBI sub-systems to build final UBI data structures, further
747 * error-recovery and so on.
749 struct ubi_attach_info {
750 struct rb_root volumes;
751 struct list_head corr;
752 struct list_head free;
753 struct list_head erase;
754 struct list_head alien;
755 struct list_head fastmap;
760 int maybe_bad_peb_count;
767 unsigned long long max_sqnum;
771 struct kmem_cache *aeb_slab_cache;
772 struct ubi_ec_hdr *ech;
773 struct ubi_vid_hdr *vidh;
777 * struct ubi_work - UBI work description data structure.
778 * @list: a link in the list of pending works
779 * @func: worker function
780 * @e: physical eraseblock to erase
781 * @vol_id: the volume ID on which this erasure is being performed
782 * @lnum: the logical eraseblock number
783 * @torture: if the physical eraseblock has to be tortured
784 * @anchor: produce a anchor PEB to by used by fastmap
786 * The @func pointer points to the worker function. If the @shutdown argument is
787 * not zero, the worker has to free the resources and exit immediately as the
788 * WL sub-system is shutting down.
789 * The worker has to return zero in case of success and a negative error code in
793 struct list_head list;
794 int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int shutdown);
795 /* The below fields are only relevant to erasure works */
796 struct ubi_wl_entry *e;
805 extern struct kmem_cache *ubi_wl_entry_slab;
806 extern const struct file_operations ubi_ctrl_cdev_operations;
807 extern const struct file_operations ubi_cdev_operations;
808 extern const struct file_operations ubi_vol_cdev_operations;
809 extern struct class ubi_class;
810 extern struct mutex ubi_devices_mutex;
811 extern struct blocking_notifier_head ubi_notifiers;
814 struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum,
816 void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb);
817 int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
818 int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips);
819 struct ubi_ainf_volume *ubi_add_av(struct ubi_attach_info *ai, int vol_id);
820 struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
822 void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av);
823 struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi,
824 struct ubi_attach_info *ai);
825 int ubi_attach(struct ubi_device *ubi, int force_scan);
826 void ubi_destroy_ai(struct ubi_attach_info *ai);
829 int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
830 struct ubi_vtbl_record *vtbl_rec);
831 int ubi_vtbl_rename_volumes(struct ubi_device *ubi,
832 struct list_head *rename_list);
833 int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai);
836 int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req);
837 int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl);
838 int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs);
839 int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list);
840 int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol);
841 void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol);
844 int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
846 int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
847 const void __user *buf, int count);
848 int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
849 const struct ubi_leb_change_req *req);
850 int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
851 const void __user *buf, int count);
854 int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
856 int ubi_check_volume(struct ubi_device *ubi, int vol_id);
857 void ubi_update_reserved(struct ubi_device *ubi);
858 void ubi_calculate_reserved(struct ubi_device *ubi);
859 int ubi_check_pattern(const void *buf, uint8_t patt, int size);
861 static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum)
863 return lnum >= 0 && lnum < vol->reserved_pebs;
867 struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol,
869 void ubi_eba_destroy_table(struct ubi_eba_table *tbl);
870 void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst,
872 void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl);
873 void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum,
874 struct ubi_eba_leb_desc *ldesc);
875 bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum);
876 int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
878 int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
879 void *buf, int offset, int len, int check);
880 int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol,
881 struct ubi_sgl *sgl, int lnum, int offset, int len,
883 int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
884 const void *buf, int offset, int len);
885 int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
886 int lnum, const void *buf, int len, int used_ebs);
887 int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
888 int lnum, const void *buf, int len);
889 int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
890 struct ubi_vid_hdr *vid_hdr);
891 int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
892 unsigned long long ubi_next_sqnum(struct ubi_device *ubi);
893 int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
894 struct ubi_attach_info *ai_scan);
897 int ubi_wl_get_peb(struct ubi_device *ubi);
898 int ubi_wl_put_peb(struct ubi_device *ubi, int vol_id, int lnum,
899 int pnum, int torture);
900 int ubi_wl_flush(struct ubi_device *ubi, int vol_id, int lnum);
901 int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum);
902 int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
903 void ubi_wl_close(struct ubi_device *ubi);
904 int ubi_thread(void *u);
905 struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor);
906 int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *used_e,
907 int lnum, int torture);
908 int ubi_is_erase_work(struct ubi_work *wrk);
909 void ubi_refill_pools(struct ubi_device *ubi);
910 int ubi_ensure_anchor_pebs(struct ubi_device *ubi);
913 int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
915 int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
917 int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture);
918 int ubi_io_is_bad(const struct ubi_device *ubi, int pnum);
919 int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum);
920 int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
921 struct ubi_ec_hdr *ec_hdr, int verbose);
922 int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
923 struct ubi_ec_hdr *ec_hdr);
924 int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
925 struct ubi_vid_hdr *vid_hdr, int verbose);
926 int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
927 struct ubi_vid_hdr *vid_hdr);
930 int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
931 int vid_hdr_offset, int max_beb_per1024);
932 int ubi_detach_mtd_dev(int ubi_num, int anyway);
933 struct ubi_device *ubi_get_device(int ubi_num);
934 void ubi_put_device(struct ubi_device *ubi);
935 struct ubi_device *ubi_get_by_major(int major);
936 int ubi_major2num(int major);
937 int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol,
939 int ubi_notify_all(struct ubi_device *ubi, int ntype,
940 struct notifier_block *nb);
941 int ubi_enumerate_volumes(struct notifier_block *nb);
942 void ubi_free_internal_volumes(struct ubi_device *ubi);
945 void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di);
946 void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
947 struct ubi_volume_info *vi);
949 int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
950 int pnum, const struct ubi_vid_hdr *vid_hdr);
953 #ifdef CONFIG_MTD_UBI_FASTMAP
954 size_t ubi_calc_fm_size(struct ubi_device *ubi);
955 int ubi_update_fastmap(struct ubi_device *ubi);
956 int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
957 struct ubi_attach_info *scan_ai);
959 static inline int ubi_update_fastmap(struct ubi_device *ubi) { return 0; }
963 #ifdef CONFIG_MTD_UBI_BLOCK
964 int ubiblock_init(void);
965 void ubiblock_exit(void);
966 int ubiblock_create(struct ubi_volume_info *vi);
967 int ubiblock_remove(struct ubi_volume_info *vi);
969 static inline int ubiblock_init(void) { return 0; }
970 static inline void ubiblock_exit(void) {}
971 static inline int ubiblock_create(struct ubi_volume_info *vi)
975 static inline int ubiblock_remove(struct ubi_volume_info *vi)
982 * ubi_for_each_free_peb - walk the UBI free RB tree.
983 * @ubi: UBI device description object
984 * @e: a pointer to a ubi_wl_entry to use as cursor
985 * @pos: a pointer to RB-tree entry type to use as a loop counter
987 #define ubi_for_each_free_peb(ubi, e, tmp_rb) \
988 ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->free, u.rb)
991 * ubi_for_each_used_peb - walk the UBI used RB tree.
992 * @ubi: UBI device description object
993 * @e: a pointer to a ubi_wl_entry to use as cursor
994 * @pos: a pointer to RB-tree entry type to use as a loop counter
996 #define ubi_for_each_used_peb(ubi, e, tmp_rb) \
997 ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->used, u.rb)
1000 * ubi_for_each_scub_peb - walk the UBI scub 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
1005 #define ubi_for_each_scrub_peb(ubi, e, tmp_rb) \
1006 ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->scrub, u.rb)
1009 * ubi_for_each_protected_peb - walk the UBI protection queue.
1010 * @ubi: UBI device description object
1011 * @i: a integer used as counter
1012 * @e: a pointer to a ubi_wl_entry to use as cursor
1014 #define ubi_for_each_protected_peb(ubi, i, e) \
1015 for ((i) = 0; (i) < UBI_PROT_QUEUE_LEN; (i)++) \
1016 list_for_each_entry((e), &(ubi->pq[(i)]), u.list)
1019 * ubi_rb_for_each_entry - walk an RB-tree.
1020 * @rb: a pointer to type 'struct rb_node' to use as a loop counter
1021 * @pos: a pointer to RB-tree entry type to use as a loop counter
1022 * @root: RB-tree's root
1023 * @member: the name of the 'struct rb_node' within the RB-tree entry
1025 #define ubi_rb_for_each_entry(rb, pos, root, member) \
1026 for (rb = rb_first(root), \
1027 pos = (rb ? container_of(rb, typeof(*pos), member) : NULL); \
1030 pos = (rb ? container_of(rb, typeof(*pos), member) : NULL))
1033 * ubi_move_aeb_to_list - move a PEB from the volume tree to a list.
1035 * @av: volume attaching information
1036 * @aeb: attaching eraseblock information
1037 * @list: the list to move to
1039 static inline void ubi_move_aeb_to_list(struct ubi_ainf_volume *av,
1040 struct ubi_ainf_peb *aeb,
1041 struct list_head *list)
1043 rb_erase(&aeb->u.rb, &av->root);
1044 list_add_tail(&aeb->u.list, list);
1048 * ubi_zalloc_vid_hdr - allocate a volume identifier header object.
1049 * @ubi: UBI device description object
1050 * @gfp_flags: GFP flags to allocate with
1052 * This function returns a pointer to the newly allocated and zero-filled
1053 * volume identifier header object in case of success and %NULL in case of
1056 static inline struct ubi_vid_hdr *
1057 ubi_zalloc_vid_hdr(const struct ubi_device *ubi, gfp_t gfp_flags)
1061 vid_hdr = kzalloc(ubi->vid_hdr_alsize, gfp_flags);
1066 * VID headers may be stored at un-aligned flash offsets, so we shift
1069 return vid_hdr + ubi->vid_hdr_shift;
1073 * ubi_free_vid_hdr - free a volume identifier header object.
1074 * @ubi: UBI device description object
1075 * @vid_hdr: the object to free
1077 static inline void ubi_free_vid_hdr(const struct ubi_device *ubi,
1078 struct ubi_vid_hdr *vid_hdr)
1085 kfree(p - ubi->vid_hdr_shift);
1089 * This function is equivalent to 'ubi_io_read()', but @offset is relative to
1090 * the beginning of the logical eraseblock, not to the beginning of the
1091 * physical eraseblock.
1093 static inline int ubi_io_read_data(const struct ubi_device *ubi, void *buf,
1094 int pnum, int offset, int len)
1096 ubi_assert(offset >= 0);
1097 return ubi_io_read(ubi, buf, pnum, offset + ubi->leb_start, len);
1101 * This function is equivalent to 'ubi_io_write()', but @offset is relative to
1102 * the beginning of the logical eraseblock, not to the beginning of the
1103 * physical eraseblock.
1105 static inline int ubi_io_write_data(struct ubi_device *ubi, const void *buf,
1106 int pnum, int offset, int len)
1108 ubi_assert(offset >= 0);
1109 return ubi_io_write(ubi, buf, pnum, offset + ubi->leb_start, len);
1113 * ubi_ro_mode - switch to read-only mode.
1114 * @ubi: UBI device description object
1116 static inline void ubi_ro_mode(struct ubi_device *ubi)
1118 if (!ubi->ro_mode) {
1120 ubi_warn(ubi, "switch to read-only mode");
1126 * vol_id2idx - get table index by volume ID.
1127 * @ubi: UBI device description object
1128 * @vol_id: volume ID
1130 static inline int vol_id2idx(const struct ubi_device *ubi, int vol_id)
1132 if (vol_id >= UBI_INTERNAL_VOL_START)
1133 return vol_id - UBI_INTERNAL_VOL_START + ubi->vtbl_slots;
1139 * idx2vol_id - get volume ID by table index.
1140 * @ubi: UBI device description object
1143 static inline int idx2vol_id(const struct ubi_device *ubi, int idx)
1145 if (idx >= ubi->vtbl_slots)
1146 return idx - ubi->vtbl_slots + UBI_INTERNAL_VOL_START;
1152 * ubi_is_fm_vol - check whether a volume ID is a Fastmap volume.
1153 * @vol_id: volume ID
1155 static inline bool ubi_is_fm_vol(int vol_id)
1158 case UBI_FM_SB_VOLUME_ID:
1159 case UBI_FM_DATA_VOLUME_ID:
1167 * ubi_find_fm_block - check whether a PEB is part of the current Fastmap.
1168 * @ubi: UBI device description object
1169 * @pnum: physical eraseblock to look for
1171 * This function returns a wear leveling object if @pnum relates to the current
1172 * fastmap, @NULL otherwise.
1174 static inline struct ubi_wl_entry *ubi_find_fm_block(const struct ubi_device *ubi,
1180 for (i = 0; i < ubi->fm->used_blocks; i++) {
1181 if (ubi->fm->e[i]->pnum == pnum)
1182 return ubi->fm->e[i];
1189 #endif /* !__UBI_UBI_H__ */