| /* |
| * 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/init.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 "ubi-media.h" |
| #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", \ |
| __func__, ##__VA_ARGS__) |
| /* UBI error messages */ |
| #define ubi_err(fmt, ...) printk(KERN_ERR "UBI error: %s: " fmt "\n", \ |
| __func__, ##__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 |
| |
| /* |
| * 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 |
| |
| /* |
| * Error codes returned by the I/O sub-system. |
| * |
| * 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_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 |
| */ |
| enum { |
| UBI_IO_PEB_EMPTY = 1, |
| UBI_IO_PEB_FREE, |
| 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_CANCEL_BITFLIPS: canceled because a bit-flip was detected in the |
| * target PEB |
| */ |
| enum { |
| MOVE_CANCEL_RACE = 1, |
| MOVE_SOURCE_RD_ERR, |
| MOVE_TARGET_RD_ERR, |
| MOVE_TARGET_WR_ERR, |
| MOVE_CANCEL_BITFLIPS, |
| }; |
| |
| /** |
| * 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_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 |
| * |
| * @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 |
| * @ch_dtype: data persistency type 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 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; |
| int ch_dtype; |
| 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, 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: 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->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 |
| * |
| * @used: RB-tree of used physical eraseblocks |
| * @erroneous: RB-tree of erroneous used physical eraseblocks |
| * @free: RB-tree of free physical eraseblocks |
| * @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, and @erroneous_peb_count fields |
| * @move_mutex: serializes eraseblock moves |
| * @work_sem: synchronizes the WL worker with use tasks |
| * @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_count: count of bad physical eraseblocks |
| * @good_peb_count: count of good physical eraseblocks |
| * @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 |
| * @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: protects @peb_buf1 and @peb_buf2 |
| * @ckvol_mutex: serializes static volume checking when opening |
| * @dbg_peb_buf: buffer of PEB size used for debugging |
| * @dbg_buf_mutex: protects @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 ref_count; |
| int image_seq; |
| |
| int rsvd_pebs; |
| int avail_pebs; |
| int beb_rsvd_pebs; |
| int beb_rsvd_level; |
| |
| 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; |
| |
| /* Wear-leveling sub-system's stuff */ |
| struct rb_root used; |
| struct rb_root erroneous; |
| struct rb_root free; |
| 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 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; |
| struct mtd_info *mtd; |
| |
| void *peb_buf1; |
| void *peb_buf2; |
| struct mutex buf_mutex; |
| struct mutex ckvol_mutex; |
| #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID |
| void *dbg_peb_buf; |
| struct mutex dbg_buf_mutex; |
| #endif |
| }; |
| |
| 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; |
| |
| /* 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_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 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_calculate_reserved(struct ubi_device *ubi); |
| |
| /* 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); |
| |
| /* 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); |
| int ubi_thread(void *u); |
| |
| /* 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 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); |
| |
| /* 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); |
| |
| /* |
| * 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_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__ */ |