/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "scan.h" #include "debug.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(fmt, ...) printk(KERN_NOTICE "UBI: " fmt "\n", ##__VA_ARGS__) /* UBI warning messages */ #define ubi_warn(fmt, ...) printk(KERN_WARNING "UBI warning: %s: " fmt "\n", \ __FUNCTION__, ##__VA_ARGS__) /* UBI error messages */ #define ubi_err(fmt, ...) printk(KERN_ERR "UBI error: %s: " fmt "\n", \ __FUNCTION__, ##__VA_ARGS__) /* Lowest number PEBs reserved for bad PEB handling */ #define MIN_RESEVED_PEBS 2 /* 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 */ #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 /* * Error codes returned by the I/O unit. * * UBI_IO_PEB_EMPTY: the physical eraseblock is empty, i.e. it contains only * 0xFF bytes * UBI_IO_PEB_FREE: the physical eraseblock is free, i.e. it contains only a * valid erase counter header, and the rest are %0xFF bytes * UBI_IO_BAD_EC_HDR: the erase counter header is corrupted (bad magic or CRC) * UBI_IO_BAD_VID_HDR: the volume identifier header is corrupted (bad magic or * CRC) * UBI_IO_BITFLIPS: bit-flips were detected and corrected */ enum { UBI_IO_PEB_EMPTY = 1, UBI_IO_PEB_FREE, UBI_IO_BAD_EC_HDR, UBI_IO_BAD_VID_HDR, UBI_IO_BITFLIPS }; /** * struct ubi_wl_entry - wear-leveling entry. * @rb: link in the corresponding RB-tree * @ec: erase counter * @pnum: physical eraseblock number * * This data structure is used in the WL unit. Each physical eraseblock has a * corresponding &struct wl_entry object which may be kept in different * RB-trees. See WL unit for details. */ struct ubi_wl_entry { struct rb_node rb; 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 unit 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 unit for details. */ struct ubi_ltree_entry { struct rb_node rb; int vol_id; int lnum; int users; struct rw_semaphore mutex; }; struct ubi_volume_desc; /** * 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 * @checked: if this static volume was checked * * @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 * @upd_marker: non-zero if the update marker is set for this volume * @corrupted: non-zero if the volume is corrupted (static volumes only) * @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 * * @updating: whether the volume is being updated * @upd_ebs: how many eraseblocks are expected to be updated * @upd_bytes: how many bytes are expected to be received * @upd_received: how many update bytes were already received * @upd_buf: update buffer which is used to collect update data * * @eba_tbl: EBA table of this volume (LEB->PEB mapping) * * @gluebi_desc: gluebi UBI volume descriptor * @gluebi_refcount: reference count of the gluebi MTD device * @gluebi_mtd: MTD device description object of the gluebi MTD device * * 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 checked; int reserved_pebs; int vol_type; int usable_leb_size; int used_ebs; int last_eb_bytes; long long used_bytes; int upd_marker; int corrupted; int alignment; int data_pad; int name_len; char name[UBI_VOL_NAME_MAX+1]; int updating; int upd_ebs; long long upd_bytes; long long upd_received; void *upd_buf; int *eba_tbl; #ifdef CONFIG_MTD_UBI_GLUEBI /* Gluebi-related stuff may be compiled out */ struct ubi_volume_desc *gluebi_desc; int gluebi_refcount; struct mtd_info gluebi_mtd; #endif }; /** * struct ubi_volume_desc - descriptor of the UBI volume returned when it is * opened. * @vol: reference to the corresponding volume description object * @mode: open mode (%UBI_READONLY, %UBI_READWRITE, or %UBI_EXCLUSIVE) */ struct ubi_volume_desc { struct ubi_volume *vol; int mode; }; struct ubi_wl_entry; /** * struct ubi_device - UBI device description structure * @dev: class 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->ref_count, @vol->mapping and @vol->eba_tbl. * * @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 * * @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 * @volumes_mutex: protects on-flash volume table and serializes volume * changes, like creation, deletion, update, resize * * @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 * * @used: RB-tree of used physical eraseblocks * @free: RB-tree of free physical eraseblocks * @scrub: RB-tree of physical eraseblocks which need scrubbing * @prot: protection trees * @prot.pnum: protection tree indexed by physical eraseblock numbers * @prot.aec: protection tree indexed by absolute erase counter value * @wl_lock: protects the @used, @free, @prot, @lookuptbl, @abs_ec, @move_from, * @move_to, @move_to_put @erase_pending, @wl_scheduled, and @works * fields * @move_mutex: serializes eraseblock moves * @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 * @abs_ec: absolute erase counter * @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_count: count of bad physical eraseblocks * @good_peb_count: count of good 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 * @mtd: MTD device descriptor * * @peb_buf1: a buffer of PEB size used for different purposes * @peb_buf2: another buffer of PEB size used for different purposes * @buf_mutex: proptects @peb_buf1 and @peb_buf2 * @dbg_peb_buf: buffer of PEB size used for debugging * @dbg_buf_mutex: proptects @dbg_peb_buf */ 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 rsvd_pebs; int avail_pebs; int beb_rsvd_pebs; int beb_rsvd_level; int vtbl_slots; int vtbl_size; struct ubi_vtbl_record *vtbl; struct mutex volumes_mutex; int max_ec; int mean_ec; /* EBA unit's stuff */ unsigned long long global_sqnum; spinlock_t ltree_lock; struct rb_root ltree; struct mutex alc_mutex; /* Wear-leveling unit's stuff */ struct rb_root used; struct rb_root free; struct rb_root scrub; struct { struct rb_root pnum; struct rb_root aec; } prot; spinlock_t wl_lock; struct mutex move_mutex; int wl_scheduled; struct ubi_wl_entry **lookuptbl; unsigned long long abs_ec; 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 unit's stuff */ long long flash_size; int peb_count; int peb_size; int bad_peb_count; int good_peb_count; 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; int bad_allowed; struct mtd_info *mtd; void *peb_buf1; void *peb_buf2; struct mutex buf_mutex; #ifdef CONFIG_MTD_UBI_DEBUG void *dbg_peb_buf; struct mutex dbg_buf_mutex; #endif }; extern struct kmem_cache *ubi_ltree_slab; extern struct kmem_cache *ubi_wl_entry_slab; extern struct file_operations ubi_cdev_operations; extern struct file_operations ubi_vol_cdev_operations; extern struct ubi_device *ubi_devices[]; extern struct class *ubi_class; /* vtbl.c */ int ubi_change_vtbl_record(struct ubi_device *ubi, int idx, struct ubi_vtbl_record *vtbl_rec); int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_scan_info *si); /* 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 ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs); 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, int vol_id, long long bytes); int ubi_more_update_data(struct ubi_device *ubi, int vol_id, 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_calculate_reserved(struct ubi_device *ubi); /* gluebi.c */ #ifdef CONFIG_MTD_UBI_GLUEBI int ubi_create_gluebi(struct ubi_device *ubi, struct ubi_volume *vol); int ubi_destroy_gluebi(struct ubi_volume *vol); void ubi_gluebi_updated(struct ubi_volume *vol); #else #define ubi_create_gluebi(ubi, vol) 0 #define ubi_destroy_gluebi(vol) 0 #define ubi_gluebi_updated(vol) #endif /* 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_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, const void *buf, int offset, int len, int dtype); int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, const void *buf, int len, int dtype, 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 dtype); int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, struct ubi_vid_hdr *vid_hdr); int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si); void ubi_eba_close(const struct ubi_device *ubi); /* wl.c */ int ubi_wl_get_peb(struct ubi_device *ubi, int dtype); int ubi_wl_put_peb(struct ubi_device *ubi, int pnum, int torture); int ubi_wl_flush(struct ubi_device *ubi); int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum); int ubi_wl_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si); void ubi_wl_close(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); /* * ubi_rb_for_each_entry - walk an RB-tree. * @rb: a pointer to type 'struct rb_node' to 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 = container_of(rb, typeof(*pos), member)) /** * 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("switch to read-only mode"); } } /** * 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__ */