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| -rw-r--r-- | drivers/mtd/ubi/ubi.h | 1240 |
1 files changed, 1240 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h new file mode 100644 index 000000000..d248ec371 --- /dev/null +++ b/drivers/mtd/ubi/ubi.h @@ -0,0 +1,1240 @@ +/* + * Copyright (c) International Business Machines Corp., 2006 + * Copyright (c) Nokia Corporation, 2006, 2007 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Author: Artem Bityutskiy (Битюцкий Артём) + */ + +#ifndef __UBI_UBI_H__ +#define __UBI_UBI_H__ + +#include <linux/types.h> +#include <linux/list.h> +#include <linux/rbtree.h> +#include <linux/sched.h> +#include <linux/wait.h> +#include <linux/mutex.h> +#include <linux/rwsem.h> +#include <linux/spinlock.h> +#include <linux/fs.h> +#include <linux/cdev.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/vmalloc.h> +#include <linux/notifier.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/ubi.h> +#include <asm/pgtable.h> + +#include "ubi-media.h" + +/* Maximum number of supported UBI devices */ +#define UBI_MAX_DEVICES 32 + +/* UBI name used for character devices, sysfs, etc */ +#define UBI_NAME_STR "ubi" + +struct ubi_device; + +/* Normal UBI messages */ +__printf(2, 3) +void ubi_msg(const struct ubi_device *ubi, const char *fmt, ...); + +/* UBI warning messages */ +__printf(2, 3) +void ubi_warn(const struct ubi_device *ubi, const char *fmt, ...); + +/* UBI error messages */ +__printf(2, 3) +void ubi_err(const struct ubi_device *ubi, const char *fmt, ...); + +/* Background thread name pattern */ +#define UBI_BGT_NAME_PATTERN "ubi_bgt%dd" + +/* + * This marker in the EBA table means that the LEB is um-mapped. + * NOTE! It has to have the same value as %UBI_ALL. + */ +#define UBI_LEB_UNMAPPED -1 + +/* + * In case of errors, UBI tries to repeat the operation several times before + * returning error. The below constant defines how many times UBI re-tries. + */ +#define UBI_IO_RETRIES 3 + +/* + * Length of the protection queue. The length is effectively equivalent to the + * number of (global) erase cycles PEBs are protected from the wear-leveling + * worker. + */ +#define UBI_PROT_QUEUE_LEN 10 + +/* The volume ID/LEB number/erase counter is unknown */ +#define UBI_UNKNOWN -1 + +/* + * The UBI debugfs directory name pattern and maximum name length (3 for "ubi" + * + 2 for the number plus 1 for the trailing zero byte. + */ +#define UBI_DFS_DIR_NAME "ubi%d" +#define UBI_DFS_DIR_LEN (3 + 2 + 1) + +/* + * Error codes returned by the I/O sub-system. + * + * UBI_IO_FF: the read region of flash contains only 0xFFs + * UBI_IO_FF_BITFLIPS: the same as %UBI_IO_FF, but also also there was a data + * integrity error reported by the MTD driver + * (uncorrectable ECC error in case of NAND) + * UBI_IO_BAD_HDR: the EC or VID header is corrupted (bad magic or CRC) + * UBI_IO_BAD_HDR_EBADMSG: the same as %UBI_IO_BAD_HDR, but also there was a + * data integrity error reported by the MTD driver + * (uncorrectable ECC error in case of NAND) + * UBI_IO_BITFLIPS: bit-flips were detected and corrected + * + * Note, it is probably better to have bit-flip and ebadmsg as flags which can + * be or'ed with other error code. But this is a big change because there are + * may callers, so it does not worth the risk of introducing a bug + */ +enum { + UBI_IO_FF = 1, + UBI_IO_FF_BITFLIPS, + UBI_IO_BAD_HDR, + UBI_IO_BAD_HDR_EBADMSG, + UBI_IO_BITFLIPS, +}; + +/* + * Return codes of the 'ubi_eba_copy_leb()' function. + * + * MOVE_CANCEL_RACE: canceled because the volume is being deleted, the source + * PEB was put meanwhile, or there is I/O on the source PEB + * MOVE_SOURCE_RD_ERR: canceled because there was a read error from the source + * PEB + * MOVE_TARGET_RD_ERR: canceled because there was a read error from the target + * PEB + * MOVE_TARGET_WR_ERR: canceled because there was a write error to the target + * PEB + * MOVE_TARGET_BITFLIPS: canceled because a bit-flip was detected in the + * target PEB + * MOVE_RETRY: retry scrubbing the PEB + */ +enum { + MOVE_CANCEL_RACE = 1, + MOVE_SOURCE_RD_ERR, + MOVE_TARGET_RD_ERR, + MOVE_TARGET_WR_ERR, + MOVE_TARGET_BITFLIPS, + MOVE_RETRY, +}; + +/* + * Return codes of the fastmap sub-system + * + * UBI_NO_FASTMAP: No fastmap super block was found + * UBI_BAD_FASTMAP: A fastmap was found but it's unusable + */ +enum { + UBI_NO_FASTMAP = 1, + UBI_BAD_FASTMAP, +}; + +/* + * Flags for emulate_power_cut in ubi_debug_info + * + * POWER_CUT_EC_WRITE: Emulate a power cut when writing an EC header + * POWER_CUT_VID_WRITE: Emulate a power cut when writing a VID header + */ +enum { + POWER_CUT_EC_WRITE = 0x01, + POWER_CUT_VID_WRITE = 0x02, +}; + +/** + * struct ubi_vid_io_buf - VID buffer used to read/write VID info to/from the + * flash. + * @hdr: a pointer to the VID header stored in buffer + * @buffer: underlying buffer + */ +struct ubi_vid_io_buf { + struct ubi_vid_hdr *hdr; + void *buffer; +}; + +/** + * struct ubi_wl_entry - wear-leveling entry. + * @u.rb: link in the corresponding (free/used) RB-tree + * @u.list: link in the protection queue + * @ec: erase counter + * @pnum: physical eraseblock number + * + * This data structure is used in the WL sub-system. Each physical eraseblock + * has a corresponding &struct wl_entry object which may be kept in different + * RB-trees. See WL sub-system for details. + */ +struct ubi_wl_entry { + union { + struct rb_node rb; + struct list_head list; + } u; + int ec; + int pnum; +}; + +/** + * struct ubi_ltree_entry - an entry in the lock tree. + * @rb: links RB-tree nodes + * @vol_id: volume ID of the locked logical eraseblock + * @lnum: locked logical eraseblock number + * @users: how many tasks are using this logical eraseblock or wait for it + * @mutex: read/write mutex to implement read/write access serialization to + * the (@vol_id, @lnum) logical eraseblock + * + * This data structure is used in the EBA sub-system to implement per-LEB + * locking. When a logical eraseblock is being locked - corresponding + * &struct ubi_ltree_entry object is inserted to the lock tree (@ubi->ltree). + * See EBA sub-system for details. + */ +struct ubi_ltree_entry { + struct rb_node rb; + int vol_id; + int lnum; + int users; + struct rw_semaphore mutex; +}; + +/** + * struct ubi_rename_entry - volume re-name description data structure. + * @new_name_len: new volume name length + * @new_name: new volume name + * @remove: if not zero, this volume should be removed, not re-named + * @desc: descriptor of the volume + * @list: links re-name entries into a list + * + * This data structure is utilized in the multiple volume re-name code. Namely, + * UBI first creates a list of &struct ubi_rename_entry objects from the + * &struct ubi_rnvol_req request object, and then utilizes this list to do all + * the job. + */ +struct ubi_rename_entry { + int new_name_len; + char new_name[UBI_VOL_NAME_MAX + 1]; + int remove; + struct ubi_volume_desc *desc; + struct list_head list; +}; + +struct ubi_volume_desc; + +/** + * struct ubi_fastmap_layout - in-memory fastmap data structure. + * @e: PEBs used by the current fastmap + * @to_be_tortured: if non-zero tortured this PEB + * @used_blocks: number of used PEBs + * @max_pool_size: maximal size of the user pool + * @max_wl_pool_size: maximal size of the pool used by the WL sub-system + */ +struct ubi_fastmap_layout { + struct ubi_wl_entry *e[UBI_FM_MAX_BLOCKS]; + int to_be_tortured[UBI_FM_MAX_BLOCKS]; + int used_blocks; + int max_pool_size; + int max_wl_pool_size; +}; + +/** + * struct ubi_fm_pool - in-memory fastmap pool + * @pebs: PEBs in this pool + * @used: number of used PEBs + * @size: total number of PEBs in this pool + * @max_size: maximal size of the pool + * + * A pool gets filled with up to max_size. + * If all PEBs within the pool are used a new fastmap will be written + * to the flash and the pool gets refilled with empty PEBs. + * + */ +struct ubi_fm_pool { + int pebs[UBI_FM_MAX_POOL_SIZE]; + int used; + int size; + int max_size; +}; + +/** + * struct ubi_eba_leb_desc - EBA logical eraseblock descriptor + * @lnum: the logical eraseblock number + * @pnum: the physical eraseblock where the LEB can be found + * + * This structure is here to hide EBA's internal from other part of the + * UBI implementation. + * + * One can query the position of a LEB by calling ubi_eba_get_ldesc(). + */ +struct ubi_eba_leb_desc { + int lnum; + int pnum; +}; + +/** + * struct ubi_volume - UBI volume description data structure. + * @dev: device object to make use of the the Linux device model + * @cdev: character device object to create character device + * @ubi: reference to the UBI device description object + * @vol_id: volume ID + * @ref_count: volume reference count + * @readers: number of users holding this volume in read-only mode + * @writers: number of users holding this volume in read-write mode + * @exclusive: whether somebody holds this volume in exclusive mode + * @metaonly: whether somebody is altering only meta data of this volume + * + * @reserved_pebs: how many physical eraseblocks are reserved for this volume + * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME) + * @usable_leb_size: logical eraseblock size without padding + * @used_ebs: how many logical eraseblocks in this volume contain data + * @last_eb_bytes: how many bytes are stored in the last logical eraseblock + * @used_bytes: how many bytes of data this volume contains + * @alignment: volume alignment + * @data_pad: how many bytes are not used at the end of physical eraseblocks to + * satisfy the requested alignment + * @name_len: volume name length + * @name: volume name + * + * @upd_ebs: how many eraseblocks are expected to be updated + * @ch_lnum: LEB number which is being changing by the atomic LEB change + * operation + * @upd_bytes: how many bytes are expected to be received for volume update or + * atomic LEB change + * @upd_received: how many bytes were already received for volume update or + * atomic LEB change + * @upd_buf: update buffer which is used to collect update data or data for + * atomic LEB change + * + * @eba_tbl: EBA table of this volume (LEB->PEB mapping) + * @skip_check: %1 if CRC check of this static volume should be skipped. + * Directly reflects the presence of the + * %UBI_VTBL_SKIP_CRC_CHECK_FLG flag in the vtbl entry + * @checked: %1 if this static volume was checked + * @corrupted: %1 if the volume is corrupted (static volumes only) + * @upd_marker: %1 if the update marker is set for this volume + * @updating: %1 if the volume is being updated + * @changing_leb: %1 if the atomic LEB change ioctl command is in progress + * @direct_writes: %1 if direct writes are enabled for this volume + * + * @checkmap: bitmap to remember which PEB->LEB mappings got checked, + * protected by UBI LEB lock tree. + * + * The @corrupted field indicates that the volume's contents is corrupted. + * Since UBI protects only static volumes, this field is not relevant to + * dynamic volumes - it is user's responsibility to assure their data + * integrity. + * + * The @upd_marker flag indicates that this volume is either being updated at + * the moment or is damaged because of an unclean reboot. + */ +struct ubi_volume { + struct device dev; + struct cdev cdev; + struct ubi_device *ubi; + int vol_id; + int ref_count; + int readers; + int writers; + int exclusive; + int metaonly; + + int reserved_pebs; + int vol_type; + int usable_leb_size; + int used_ebs; + int last_eb_bytes; + long long used_bytes; + int alignment; + int data_pad; + int name_len; + char name[UBI_VOL_NAME_MAX + 1]; + + int upd_ebs; + int ch_lnum; + long long upd_bytes; + long long upd_received; + void *upd_buf; + + struct ubi_eba_table *eba_tbl; + unsigned int skip_check:1; + unsigned int checked:1; + unsigned int corrupted:1; + unsigned int upd_marker:1; + unsigned int updating:1; + unsigned int changing_leb:1; + unsigned int direct_writes:1; + +#ifdef CONFIG_MTD_UBI_FASTMAP + unsigned long *checkmap; +#endif +}; + +/** + * struct ubi_volume_desc - UBI volume descriptor returned when it is opened. + * @vol: reference to the corresponding volume description object + * @mode: open mode (%UBI_READONLY, %UBI_READWRITE, %UBI_EXCLUSIVE + * or %UBI_METAONLY) + */ +struct ubi_volume_desc { + struct ubi_volume *vol; + int mode; +}; + +struct ubi_wl_entry; + +/** + * struct ubi_debug_info - debugging information for an UBI device. + * + * @chk_gen: if UBI general extra checks are enabled + * @chk_io: if UBI I/O extra checks are enabled + * @chk_fastmap: if UBI fastmap extra checks are enabled + * @disable_bgt: disable the background task for testing purposes + * @emulate_bitflips: emulate bit-flips for testing purposes + * @emulate_io_failures: emulate write/erase failures for testing purposes + * @emulate_power_cut: emulate power cut for testing purposes + * @power_cut_counter: count down for writes left until emulated power cut + * @power_cut_min: minimum number of writes before emulating a power cut + * @power_cut_max: maximum number of writes until emulating a power cut + * @dfs_dir_name: name of debugfs directory containing files of this UBI device + * @dfs_dir: direntry object of the UBI device debugfs directory + * @dfs_chk_gen: debugfs knob to enable UBI general extra checks + * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks + * @dfs_chk_fastmap: debugfs knob to enable UBI fastmap extra checks + * @dfs_disable_bgt: debugfs knob to disable the background task + * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips + * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures + * @dfs_emulate_power_cut: debugfs knob to emulate power cuts + * @dfs_power_cut_min: debugfs knob for minimum writes before power cut + * @dfs_power_cut_max: debugfs knob for maximum writes until power cut + */ +struct ubi_debug_info { + unsigned int chk_gen:1; + unsigned int chk_io:1; + unsigned int chk_fastmap:1; + unsigned int disable_bgt:1; + unsigned int emulate_bitflips:1; + unsigned int emulate_io_failures:1; + unsigned int emulate_power_cut:2; + unsigned int power_cut_counter; + unsigned int power_cut_min; + unsigned int power_cut_max; + char dfs_dir_name[UBI_DFS_DIR_LEN + 1]; + struct dentry *dfs_dir; + struct dentry *dfs_chk_gen; + struct dentry *dfs_chk_io; + struct dentry *dfs_chk_fastmap; + struct dentry *dfs_disable_bgt; + struct dentry *dfs_emulate_bitflips; + struct dentry *dfs_emulate_io_failures; + struct dentry *dfs_emulate_power_cut; + struct dentry *dfs_power_cut_min; + struct dentry *dfs_power_cut_max; +}; + +/** + * struct ubi_device - UBI device description structure + * @dev: UBI device object to use the the Linux device model + * @cdev: character device object to create character device + * @ubi_num: UBI device number + * @ubi_name: UBI device name + * @vol_count: number of volumes in this UBI device + * @volumes: volumes of this UBI device + * @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs, + * @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count, + * @vol->readers, @vol->writers, @vol->exclusive, + * @vol->metaonly, @vol->ref_count, @vol->mapping and + * @vol->eba_tbl. + * @ref_count: count of references on the UBI device + * @image_seq: image sequence number recorded on EC headers + * + * @rsvd_pebs: count of reserved physical eraseblocks + * @avail_pebs: count of available physical eraseblocks + * @beb_rsvd_pebs: how many physical eraseblocks are reserved for bad PEB + * handling + * @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling + * + * @autoresize_vol_id: ID of the volume which has to be auto-resized at the end + * of UBI initialization + * @vtbl_slots: how many slots are available in the volume table + * @vtbl_size: size of the volume table in bytes + * @vtbl: in-RAM volume table copy + * @device_mutex: protects on-flash volume table and serializes volume + * creation, deletion, update, re-size, re-name and set + * property + * + * @max_ec: current highest erase counter value + * @mean_ec: current mean erase counter value + * + * @global_sqnum: global sequence number + * @ltree_lock: protects the lock tree and @global_sqnum + * @ltree: the lock tree + * @alc_mutex: serializes "atomic LEB change" operations + * + * @fm_disabled: non-zero if fastmap is disabled (default) + * @fm: in-memory data structure of the currently used fastmap + * @fm_pool: in-memory data structure of the fastmap pool + * @fm_wl_pool: in-memory data structure of the fastmap pool used by the WL + * sub-system + * @fm_protect: serializes ubi_update_fastmap(), protects @fm_buf and makes sure + * that critical sections cannot be interrupted by ubi_update_fastmap() + * @fm_buf: vmalloc()'d buffer which holds the raw fastmap + * @fm_size: fastmap size in bytes + * @fm_eba_sem: allows ubi_update_fastmap() to block EBA table changes + * @fm_work: fastmap work queue + * @fm_work_scheduled: non-zero if fastmap work was scheduled + * @fast_attach: non-zero if UBI was attached by fastmap + * @fm_anchor: The next anchor PEB to use for fastmap + * @fm_do_produce_anchor: If true produce an anchor PEB in wl + * + * @used: RB-tree of used physical eraseblocks + * @erroneous: RB-tree of erroneous used physical eraseblocks + * @free: RB-tree of free physical eraseblocks + * @free_count: Contains the number of elements in @free + * @scrub: RB-tree of physical eraseblocks which need scrubbing + * @pq: protection queue (contain physical eraseblocks which are temporarily + * protected from the wear-leveling worker) + * @pq_head: protection queue head + * @wl_lock: protects the @used, @free, @pq, @pq_head, @lookuptbl, @move_from, + * @move_to, @move_to_put @erase_pending, @wl_scheduled, @works, + * @erroneous, @erroneous_peb_count, @fm_work_scheduled, @fm_pool, + * and @fm_wl_pool fields + * @move_mutex: serializes eraseblock moves + * @work_sem: used to wait for all the scheduled works to finish and prevent + * new works from being submitted + * @wl_scheduled: non-zero if the wear-leveling was scheduled + * @lookuptbl: a table to quickly find a &struct ubi_wl_entry object for any + * physical eraseblock + * @move_from: physical eraseblock from where the data is being moved + * @move_to: physical eraseblock where the data is being moved to + * @move_to_put: if the "to" PEB was put + * @works: list of pending works + * @works_count: count of pending works + * @bgt_thread: background thread description object + * @thread_enabled: if the background thread is enabled + * @bgt_name: background thread name + * + * @flash_size: underlying MTD device size (in bytes) + * @peb_count: count of physical eraseblocks on the MTD device + * @peb_size: physical eraseblock size + * @bad_peb_limit: top limit of expected bad physical eraseblocks + * @bad_peb_count: count of bad physical eraseblocks + * @good_peb_count: count of good physical eraseblocks + * @corr_peb_count: count of corrupted physical eraseblocks (preserved and not + * used by UBI) + * @erroneous_peb_count: count of erroneous physical eraseblocks in @erroneous + * @max_erroneous: maximum allowed amount of erroneous physical eraseblocks + * @min_io_size: minimal input/output unit size of the underlying MTD device + * @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers + * @ro_mode: if the UBI device is in read-only mode + * @leb_size: logical eraseblock size + * @leb_start: starting offset of logical eraseblocks within physical + * eraseblocks + * @ec_hdr_alsize: size of the EC header aligned to @hdrs_min_io_size + * @vid_hdr_alsize: size of the VID header aligned to @hdrs_min_io_size + * @vid_hdr_offset: starting offset of the volume identifier header (might be + * unaligned) + * @vid_hdr_aloffset: starting offset of the VID header aligned to + * @hdrs_min_io_size + * @vid_hdr_shift: contains @vid_hdr_offset - @vid_hdr_aloffset + * @bad_allowed: whether the MTD device admits bad physical eraseblocks or not + * @nor_flash: non-zero if working on top of NOR flash + * @max_write_size: maximum amount of bytes the underlying flash can write at a + * time (MTD write buffer size) + * @mtd: MTD device descriptor + * + * @peb_buf: a buffer of PEB size used for different purposes + * @buf_mutex: protects @peb_buf + * @ckvol_mutex: serializes static volume checking when opening + * + * @dbg: debugging information for this UBI device + */ +struct ubi_device { + struct cdev cdev; + struct device dev; + int ubi_num; + char ubi_name[sizeof(UBI_NAME_STR)+5]; + int vol_count; + struct ubi_volume *volumes[UBI_MAX_VOLUMES+UBI_INT_VOL_COUNT]; + spinlock_t volumes_lock; + int ref_count; + int image_seq; + + int rsvd_pebs; + int avail_pebs; + int beb_rsvd_pebs; + int beb_rsvd_level; + int bad_peb_limit; + + int autoresize_vol_id; + int vtbl_slots; + int vtbl_size; + struct ubi_vtbl_record *vtbl; + struct mutex device_mutex; + + int max_ec; + /* Note, mean_ec is not updated run-time - should be fixed */ + int mean_ec; + + /* EBA sub-system's stuff */ + unsigned long long global_sqnum; + spinlock_t ltree_lock; + struct rb_root ltree; + struct mutex alc_mutex; + + /* Fastmap stuff */ + int fm_disabled; + struct ubi_fastmap_layout *fm; + struct ubi_fm_pool fm_pool; + struct ubi_fm_pool fm_wl_pool; + struct rw_semaphore fm_eba_sem; + struct rw_semaphore fm_protect; + void *fm_buf; + size_t fm_size; + struct work_struct fm_work; + int fm_work_scheduled; + int fast_attach; + struct ubi_wl_entry *fm_anchor; + int fm_do_produce_anchor; + + /* Wear-leveling sub-system's stuff */ + struct rb_root used; + struct rb_root erroneous; + struct rb_root free; + int free_count; + struct rb_root scrub; + struct list_head pq[UBI_PROT_QUEUE_LEN]; + int pq_head; + spinlock_t wl_lock; + struct mutex move_mutex; + struct rw_semaphore work_sem; + int wl_scheduled; + struct ubi_wl_entry **lookuptbl; + struct ubi_wl_entry *move_from; + struct ubi_wl_entry *move_to; + int move_to_put; + struct list_head works; + int works_count; + struct task_struct *bgt_thread; + int thread_enabled; + char bgt_name[sizeof(UBI_BGT_NAME_PATTERN)+2]; + + /* I/O sub-system's stuff */ + long long flash_size; + int peb_count; + int peb_size; + int bad_peb_count; + int good_peb_count; + int corr_peb_count; + int erroneous_peb_count; + int max_erroneous; + int min_io_size; + int hdrs_min_io_size; + int ro_mode; + int leb_size; + int leb_start; + int ec_hdr_alsize; + int vid_hdr_alsize; + int vid_hdr_offset; + int vid_hdr_aloffset; + int vid_hdr_shift; + unsigned int bad_allowed:1; + unsigned int nor_flash:1; + int max_write_size; + struct mtd_info *mtd; + + void *peb_buf; + struct mutex buf_mutex; + struct mutex ckvol_mutex; + + struct ubi_debug_info dbg; +}; + +/** + * struct ubi_ainf_peb - attach information about a physical eraseblock. + * @ec: erase counter (%UBI_UNKNOWN if it is unknown) + * @pnum: physical eraseblock number + * @vol_id: ID of the volume this LEB belongs to + * @lnum: logical eraseblock number + * @scrub: if this physical eraseblock needs scrubbing + * @copy_flag: this LEB is a copy (@copy_flag is set in VID header of this LEB) + * @sqnum: sequence number + * @u: unions RB-tree or @list links + * @u.rb: link in the per-volume RB-tree of &struct ubi_ainf_peb objects + * @u.list: link in one of the eraseblock lists + * + * One object of this type is allocated for each physical eraseblock when + * attaching an MTD device. Note, if this PEB does not belong to any LEB / + * volume, the @vol_id and @lnum fields are initialized to %UBI_UNKNOWN. + */ +struct ubi_ainf_peb { + int ec; + int pnum; + int vol_id; + int lnum; + unsigned int scrub:1; + unsigned int copy_flag:1; + unsigned long long sqnum; + union { + struct rb_node rb; + struct list_head list; + } u; +}; + +/** + * struct ubi_ainf_volume - attaching information about a volume. + * @vol_id: volume ID + * @highest_lnum: highest logical eraseblock number in this volume + * @leb_count: number of logical eraseblocks in this volume + * @vol_type: volume type + * @used_ebs: number of used logical eraseblocks in this volume (only for + * static volumes) + * @last_data_size: amount of data in the last logical eraseblock of this + * volume (always equivalent to the usable logical eraseblock + * size in case of dynamic volumes) + * @data_pad: how many bytes at the end of logical eraseblocks of this volume + * are not used (due to volume alignment) + * @compat: compatibility flags of this volume + * @rb: link in the volume RB-tree + * @root: root of the RB-tree containing all the eraseblock belonging to this + * volume (&struct ubi_ainf_peb objects) + * + * One object of this type is allocated for each volume when attaching an MTD + * device. + */ +struct ubi_ainf_volume { + int vol_id; + int highest_lnum; + int leb_count; + int vol_type; + int used_ebs; + int last_data_size; + int data_pad; + int compat; + struct rb_node rb; + struct rb_root root; +}; + +/** + * struct ubi_attach_info - MTD device attaching information. + * @volumes: root of the volume RB-tree + * @corr: list of corrupted physical eraseblocks + * @free: list of free physical eraseblocks + * @erase: list of physical eraseblocks which have to be erased + * @alien: list of physical eraseblocks which should not be used by UBI (e.g., + * those belonging to "preserve"-compatible internal volumes) + * @fastmap: list of physical eraseblocks which relate to fastmap (e.g., + * eraseblocks of the current and not yet erased old fastmap blocks) + * @corr_peb_count: count of PEBs in the @corr list + * @empty_peb_count: count of PEBs which are presumably empty (contain only + * 0xFF bytes) + * @alien_peb_count: count of PEBs in the @alien list + * @bad_peb_count: count of bad physical eraseblocks + * @maybe_bad_peb_count: count of bad physical eraseblocks which are not marked + * as bad yet, but which look like bad + * @vols_found: number of volumes found + * @highest_vol_id: highest volume ID + * @is_empty: flag indicating whether the MTD device is empty or not + * @force_full_scan: flag indicating whether we need to do a full scan and drop + all existing Fastmap data structures + * @min_ec: lowest erase counter value + * @max_ec: highest erase counter value + * @max_sqnum: highest sequence number value + * @mean_ec: mean erase counter value + * @ec_sum: a temporary variable used when calculating @mean_ec + * @ec_count: a temporary variable used when calculating @mean_ec + * @aeb_slab_cache: slab cache for &struct ubi_ainf_peb objects + * @ech: temporary EC header. Only available during scan + * @vidh: temporary VID buffer. Only available during scan + * + * This data structure contains the result of attaching an MTD device and may + * be used by other UBI sub-systems to build final UBI data structures, further + * error-recovery and so on. + */ +struct ubi_attach_info { + struct rb_root volumes; + struct list_head corr; + struct list_head free; + struct list_head erase; + struct list_head alien; + struct list_head fastmap; + int corr_peb_count; + int empty_peb_count; + int alien_peb_count; + int bad_peb_count; + int maybe_bad_peb_count; + int vols_found; + int highest_vol_id; + int is_empty; + int force_full_scan; + int min_ec; + int max_ec; + unsigned long long max_sqnum; + int mean_ec; + uint64_t ec_sum; + int ec_count; + struct kmem_cache *aeb_slab_cache; + struct ubi_ec_hdr *ech; + struct ubi_vid_io_buf *vidb; +}; + +/** + * struct ubi_work - UBI work description data structure. + * @list: a link in the list of pending works + * @func: worker function + * @e: physical eraseblock to erase + * @vol_id: the volume ID on which this erasure is being performed + * @lnum: the logical eraseblock number + * @torture: if the physical eraseblock has to be tortured + * + * The @func pointer points to the worker function. If the @shutdown argument is + * not zero, the worker has to free the resources and exit immediately as the + * WL sub-system is shutting down. + * The worker has to return zero in case of success and a negative error code in + * case of failure. + */ +struct ubi_work { + struct list_head list; + int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int shutdown); + /* The below fields are only relevant to erasure works */ + struct ubi_wl_entry *e; + int vol_id; + int lnum; + int torture; +}; + +#include "debug.h" + +extern struct kmem_cache *ubi_wl_entry_slab; +extern const struct file_operations ubi_ctrl_cdev_operations; +extern const struct file_operations ubi_cdev_operations; +extern const struct file_operations ubi_vol_cdev_operations; +extern struct class ubi_class; +extern struct mutex ubi_devices_mutex; +extern struct blocking_notifier_head ubi_notifiers; + +/* attach.c */ +struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum, + int ec); +void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb); +int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum, + int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips); +struct ubi_ainf_volume *ubi_add_av(struct ubi_attach_info *ai, int vol_id); +struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai, + int vol_id); +void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av); +struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi, + struct ubi_attach_info *ai); +int ubi_attach(struct ubi_device *ubi, int force_scan); +void ubi_destroy_ai(struct ubi_attach_info *ai); + +/* vtbl.c */ +int ubi_change_vtbl_record(struct ubi_device *ubi, int idx, + struct ubi_vtbl_record *vtbl_rec); +int ubi_vtbl_rename_volumes(struct ubi_device *ubi, + struct list_head *rename_list); +int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai); + +/* vmt.c */ +int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req); +int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl); +int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs); +int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list); +int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol); +void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol); + +/* upd.c */ +int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol, + long long bytes); +int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol, + const void __user *buf, int count); +int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, + const struct ubi_leb_change_req *req); +int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol, + const void __user *buf, int count); + +/* misc.c */ +int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf, + int length); +int ubi_check_volume(struct ubi_device *ubi, int vol_id); +void ubi_update_reserved(struct ubi_device *ubi); +void ubi_calculate_reserved(struct ubi_device *ubi); +int ubi_check_pattern(const void *buf, uint8_t patt, int size); + +static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum) +{ + return lnum >= 0 && lnum < vol->reserved_pebs; +} + +/* eba.c */ +struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol, + int nentries); +void ubi_eba_destroy_table(struct ubi_eba_table *tbl); +void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst, + int nentries); +void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl); +void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum, + struct ubi_eba_leb_desc *ldesc); +bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum); +int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, + int lnum); +int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, + void *buf, int offset, int len, int check); +int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol, + struct ubi_sgl *sgl, int lnum, int offset, int len, + int check); +int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, + const void *buf, int offset, int len); +int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, + int lnum, const void *buf, int len, int used_ebs); +int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, + int lnum, const void *buf, int len); +int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, + struct ubi_vid_io_buf *vidb); +int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai); +unsigned long long ubi_next_sqnum(struct ubi_device *ubi); +int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap, + struct ubi_attach_info *ai_scan); + +/* wl.c */ +int ubi_wl_get_peb(struct ubi_device *ubi); +int ubi_wl_put_peb(struct ubi_device *ubi, int vol_id, int lnum, + int pnum, int torture); +int ubi_wl_flush(struct ubi_device *ubi, int vol_id, int lnum); +int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum); +int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai); +void ubi_wl_close(struct ubi_device *ubi); +int ubi_thread(void *u); +struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor); +int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *used_e, + int lnum, int torture); +int ubi_is_erase_work(struct ubi_work *wrk); +void ubi_refill_pools(struct ubi_device *ubi); +int ubi_ensure_anchor_pebs(struct ubi_device *ubi); + +/* io.c */ +int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset, + int len); +int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset, + int len); +int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture); +int ubi_io_is_bad(const struct ubi_device *ubi, int pnum); +int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum); +int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, + struct ubi_ec_hdr *ec_hdr, int verbose); +int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum, + struct ubi_ec_hdr *ec_hdr); +int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, + struct ubi_vid_io_buf *vidb, int verbose); +int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, + struct ubi_vid_io_buf *vidb); + +/* build.c */ +int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, + int vid_hdr_offset, int max_beb_per1024); +int ubi_detach_mtd_dev(int ubi_num, int anyway); +struct ubi_device *ubi_get_device(int ubi_num); +void ubi_put_device(struct ubi_device *ubi); +struct ubi_device *ubi_get_by_major(int major); +int ubi_major2num(int major); +int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, + int ntype); +int ubi_notify_all(struct ubi_device *ubi, int ntype, + struct notifier_block *nb); +int ubi_enumerate_volumes(struct notifier_block *nb); +void ubi_free_internal_volumes(struct ubi_device *ubi); + +/* kapi.c */ +void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di); +void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol, + struct ubi_volume_info *vi); +/* scan.c */ +int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb, + int pnum, const struct ubi_vid_hdr *vid_hdr); + +/* fastmap.c */ +#ifdef CONFIG_MTD_UBI_FASTMAP +size_t ubi_calc_fm_size(struct ubi_device *ubi); +int ubi_update_fastmap(struct ubi_device *ubi); +int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai, + struct ubi_attach_info *scan_ai); +int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count); +void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol); +#else +static inline int ubi_update_fastmap(struct ubi_device *ubi) { return 0; } +int static inline ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count) { return 0; } +static inline void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol) {} +#endif + +/* block.c */ +#ifdef CONFIG_MTD_UBI_BLOCK +int ubiblock_init(void); +void ubiblock_exit(void); +int ubiblock_create(struct ubi_volume_info *vi); +int ubiblock_remove(struct ubi_volume_info *vi); +#else +static inline int ubiblock_init(void) { return 0; } +static inline void ubiblock_exit(void) {} +static inline int ubiblock_create(struct ubi_volume_info *vi) +{ + return -ENOSYS; +} +static inline int ubiblock_remove(struct ubi_volume_info *vi) +{ + return -ENOSYS; +} +#endif + +/* + * ubi_for_each_free_peb - walk the UBI free RB tree. + * @ubi: UBI device description object + * @e: a pointer to a ubi_wl_entry to use as cursor + * @pos: a pointer to RB-tree entry type to use as a loop counter + */ +#define ubi_for_each_free_peb(ubi, e, tmp_rb) \ + ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->free, u.rb) + +/* + * ubi_for_each_used_peb - walk the UBI used RB tree. + * @ubi: UBI device description object + * @e: a pointer to a ubi_wl_entry to use as cursor + * @pos: a pointer to RB-tree entry type to use as a loop counter + */ +#define ubi_for_each_used_peb(ubi, e, tmp_rb) \ + ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->used, u.rb) + +/* + * ubi_for_each_scub_peb - walk the UBI scub RB tree. + * @ubi: UBI device description object + * @e: a pointer to a ubi_wl_entry to use as cursor + * @pos: a pointer to RB-tree entry type to use as a loop counter + */ +#define ubi_for_each_scrub_peb(ubi, e, tmp_rb) \ + ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->scrub, u.rb) + +/* + * ubi_for_each_protected_peb - walk the UBI protection queue. + * @ubi: UBI device description object + * @i: a integer used as counter + * @e: a pointer to a ubi_wl_entry to use as cursor + */ +#define ubi_for_each_protected_peb(ubi, i, e) \ + for ((i) = 0; (i) < UBI_PROT_QUEUE_LEN; (i)++) \ + list_for_each_entry((e), &(ubi->pq[(i)]), u.list) + +/* + * ubi_rb_for_each_entry - walk an RB-tree. + * @rb: a pointer to type 'struct rb_node' to use as a loop counter + * @pos: a pointer to RB-tree entry type to use as a loop counter + * @root: RB-tree's root + * @member: the name of the 'struct rb_node' within the RB-tree entry + */ +#define ubi_rb_for_each_entry(rb, pos, root, member) \ + for (rb = rb_first(root), \ + pos = (rb ? container_of(rb, typeof(*pos), member) : NULL); \ + rb; \ + rb = rb_next(rb), \ + pos = (rb ? container_of(rb, typeof(*pos), member) : NULL)) + +/* + * ubi_move_aeb_to_list - move a PEB from the volume tree to a list. + * + * @av: volume attaching information + * @aeb: attaching eraseblock information + * @list: the list to move to + */ +static inline void ubi_move_aeb_to_list(struct ubi_ainf_volume *av, + struct ubi_ainf_peb *aeb, + struct list_head *list) +{ + rb_erase(&aeb->u.rb, &av->root); + list_add_tail(&aeb->u.list, list); +} + +/** + * ubi_init_vid_buf - Initialize a VID buffer + * @ubi: the UBI device + * @vidb: the VID buffer to initialize + * @buf: the underlying buffer + */ +static inline void ubi_init_vid_buf(const struct ubi_device *ubi, + struct ubi_vid_io_buf *vidb, + void *buf) +{ + if (buf) + memset(buf, 0, ubi->vid_hdr_alsize); + + vidb->buffer = buf; + vidb->hdr = buf + ubi->vid_hdr_shift; +} + +/** + * ubi_init_vid_buf - Allocate a VID buffer + * @ubi: the UBI device + * @gfp_flags: GFP flags to use for the allocation + */ +static inline struct ubi_vid_io_buf * +ubi_alloc_vid_buf(const struct ubi_device *ubi, gfp_t gfp_flags) +{ + struct ubi_vid_io_buf *vidb; + void *buf; + + vidb = kzalloc(sizeof(*vidb), gfp_flags); + if (!vidb) + return NULL; + + buf = kmalloc(ubi->vid_hdr_alsize, gfp_flags); + if (!buf) { + kfree(vidb); + return NULL; + } + + ubi_init_vid_buf(ubi, vidb, buf); + + return vidb; +} + +/** + * ubi_free_vid_buf - Free a VID buffer + * @vidb: the VID buffer to free + */ +static inline void ubi_free_vid_buf(struct ubi_vid_io_buf *vidb) +{ + if (!vidb) + return; + + kfree(vidb->buffer); + kfree(vidb); +} + +/** + * ubi_get_vid_hdr - Get the VID header attached to a VID buffer + * @vidb: VID buffer + */ +static inline struct ubi_vid_hdr *ubi_get_vid_hdr(struct ubi_vid_io_buf *vidb) +{ + return vidb->hdr; +} + +/* + * This function is equivalent to 'ubi_io_read()', but @offset is relative to + * the beginning of the logical eraseblock, not to the beginning of the + * physical eraseblock. + */ +static inline int ubi_io_read_data(const struct ubi_device *ubi, void *buf, + int pnum, int offset, int len) +{ + ubi_assert(offset >= 0); + return ubi_io_read(ubi, buf, pnum, offset + ubi->leb_start, len); +} + +/* + * This function is equivalent to 'ubi_io_write()', but @offset is relative to + * the beginning of the logical eraseblock, not to the beginning of the + * physical eraseblock. + */ +static inline int ubi_io_write_data(struct ubi_device *ubi, const void *buf, + int pnum, int offset, int len) +{ + ubi_assert(offset >= 0); + return ubi_io_write(ubi, buf, pnum, offset + ubi->leb_start, len); +} + +/** + * ubi_ro_mode - switch to read-only mode. + * @ubi: UBI device description object + */ +static inline void ubi_ro_mode(struct ubi_device *ubi) +{ + if (!ubi->ro_mode) { + ubi->ro_mode = 1; + ubi_warn(ubi, "switch to read-only mode"); + dump_stack(); + } +} + +/** + * vol_id2idx - get table index by volume ID. + * @ubi: UBI device description object + * @vol_id: volume ID + */ +static inline int vol_id2idx(const struct ubi_device *ubi, int vol_id) +{ + if (vol_id >= UBI_INTERNAL_VOL_START) + return vol_id - UBI_INTERNAL_VOL_START + ubi->vtbl_slots; + else + return vol_id; +} + +/** + * idx2vol_id - get volume ID by table index. + * @ubi: UBI device description object + * @idx: table index + */ +static inline int idx2vol_id(const struct ubi_device *ubi, int idx) +{ + if (idx >= ubi->vtbl_slots) + return idx - ubi->vtbl_slots + UBI_INTERNAL_VOL_START; + else + return idx; +} + +/** + * ubi_is_fm_vol - check whether a volume ID is a Fastmap volume. + * @vol_id: volume ID + */ +static inline bool ubi_is_fm_vol(int vol_id) +{ + switch (vol_id) { + case UBI_FM_SB_VOLUME_ID: + case UBI_FM_DATA_VOLUME_ID: + return true; + } + + return false; +} + +/** + * ubi_find_fm_block - check whether a PEB is part of the current Fastmap. + * @ubi: UBI device description object + * @pnum: physical eraseblock to look for + * + * This function returns a wear leveling object if @pnum relates to the current + * fastmap, @NULL otherwise. + */ +static inline struct ubi_wl_entry *ubi_find_fm_block(const struct ubi_device *ubi, + int pnum) +{ + int i; + + if (ubi->fm) { + for (i = 0; i < ubi->fm->used_blocks; i++) { + if (ubi->fm->e[i]->pnum == pnum) + return ubi->fm->e[i]; + } + } + + return NULL; +} + +#endif /* !__UBI_UBI_H__ */ |