| /* |
| * 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" |
| |
| /* Normal UBI messages */ |
| #define ubi_msg(ubi, fmt, ...) pr_notice(UBI_NAME_STR "%d: " fmt "\n", \ |
| ubi->ubi_num, ##__VA_ARGS__) |
| /* UBI warning messages */ |
| #define ubi_warn(ubi, fmt, ...) pr_warn(UBI_NAME_STR "%d warning: %s: " fmt "\n", \ |
| ubi->ubi_num, __func__, ##__VA_ARGS__) |
| /* UBI error messages */ |
| #define ubi_err(ubi, fmt, ...) pr_err(UBI_NAME_STR "%d error: %s: " fmt "\n", \ |
| ubi->ubi_num, __func__, ##__VA_ARGS__) |
| |
| /* 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_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_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) |
| * @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 |
| * |
| * 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; |
| |
| int *eba_tbl; |
| 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; |
| }; |
| |
| /** |
| * 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 |
| * |
| * @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 of 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; |
| |
| /* 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) |
| * @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 |
| * @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 |
| * |
| * 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; |
| 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 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_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 |
| * @anchor: produce a anchor PEB to by used by fastmap |
| * |
| * 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; |
| int anchor; |
| }; |
| |
| #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 */ |
| 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_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); |
| |
| /* eba.c */ |
| 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_hdr *vid_hdr); |
| 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_hdr *vid_hdr, int verbose); |
| int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, |
| struct ubi_vid_hdr *vid_hdr); |
| |
| /* 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, |
| int fm_anchor); |
| #else |
| static inline int ubi_update_fastmap(struct ubi_device *ubi) { return 0; } |
| #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_zalloc_vid_hdr - allocate a volume identifier header object. |
| * @ubi: UBI device description object |
| * @gfp_flags: GFP flags to allocate with |
| * |
| * This function returns a pointer to the newly allocated and zero-filled |
| * volume identifier header object in case of success and %NULL in case of |
| * failure. |
| */ |
| static inline struct ubi_vid_hdr * |
| ubi_zalloc_vid_hdr(const struct ubi_device *ubi, gfp_t gfp_flags) |
| { |
| void *vid_hdr; |
| |
| vid_hdr = kzalloc(ubi->vid_hdr_alsize, gfp_flags); |
| if (!vid_hdr) |
| return NULL; |
| |
| /* |
| * VID headers may be stored at un-aligned flash offsets, so we shift |
| * the pointer. |
| */ |
| return vid_hdr + ubi->vid_hdr_shift; |
| } |
| |
| /** |
| * ubi_free_vid_hdr - free a volume identifier header object. |
| * @ubi: UBI device description object |
| * @vid_hdr: the object to free |
| */ |
| static inline void ubi_free_vid_hdr(const struct ubi_device *ubi, |
| struct ubi_vid_hdr *vid_hdr) |
| { |
| void *p = vid_hdr; |
| |
| if (!p) |
| return; |
| |
| kfree(p - ubi->vid_hdr_shift); |
| } |
| |
| /* |
| * 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; |
| } |
| |
| #endif /* !__UBI_UBI_H__ */ |
