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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * Copyright (c) Nokia Corporation, 2006, 2007 | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
20 | */ | |
21 | ||
22 | #ifndef __UBI_UBI_H__ | |
23 | #define __UBI_UBI_H__ | |
24 | ||
25 | #include <linux/init.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/list.h> | |
28 | #include <linux/rbtree.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/wait.h> | |
31 | #include <linux/mutex.h> | |
32 | #include <linux/rwsem.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/fs.h> | |
35 | #include <linux/cdev.h> | |
36 | #include <linux/device.h> | |
37 | #include <linux/string.h> | |
92ad8f37 | 38 | #include <linux/vmalloc.h> |
801c135c | 39 | #include <linux/mtd/mtd.h> |
801c135c AB |
40 | #include <linux/mtd/ubi.h> |
41 | ||
92a74f1c | 42 | #include "ubi-media.h" |
801c135c AB |
43 | #include "scan.h" |
44 | #include "debug.h" | |
45 | ||
46 | /* Maximum number of supported UBI devices */ | |
47 | #define UBI_MAX_DEVICES 32 | |
48 | ||
49 | /* UBI name used for character devices, sysfs, etc */ | |
50 | #define UBI_NAME_STR "ubi" | |
51 | ||
52 | /* Normal UBI messages */ | |
53 | #define ubi_msg(fmt, ...) printk(KERN_NOTICE "UBI: " fmt "\n", ##__VA_ARGS__) | |
54 | /* UBI warning messages */ | |
55 | #define ubi_warn(fmt, ...) printk(KERN_WARNING "UBI warning: %s: " fmt "\n", \ | |
cb53b3b9 | 56 | __func__, ##__VA_ARGS__) |
801c135c AB |
57 | /* UBI error messages */ |
58 | #define ubi_err(fmt, ...) printk(KERN_ERR "UBI error: %s: " fmt "\n", \ | |
cb53b3b9 | 59 | __func__, ##__VA_ARGS__) |
801c135c AB |
60 | |
61 | /* Lowest number PEBs reserved for bad PEB handling */ | |
62 | #define MIN_RESEVED_PEBS 2 | |
63 | ||
64 | /* Background thread name pattern */ | |
65 | #define UBI_BGT_NAME_PATTERN "ubi_bgt%dd" | |
66 | ||
67 | /* This marker in the EBA table means that the LEB is um-mapped */ | |
68 | #define UBI_LEB_UNMAPPED -1 | |
69 | ||
70 | /* | |
71 | * In case of errors, UBI tries to repeat the operation several times before | |
72 | * returning error. The below constant defines how many times UBI re-tries. | |
73 | */ | |
74 | #define UBI_IO_RETRIES 3 | |
75 | ||
76 | /* | |
77 | * Error codes returned by the I/O unit. | |
78 | * | |
79 | * UBI_IO_PEB_EMPTY: the physical eraseblock is empty, i.e. it contains only | |
80 | * 0xFF bytes | |
81 | * UBI_IO_PEB_FREE: the physical eraseblock is free, i.e. it contains only a | |
82 | * valid erase counter header, and the rest are %0xFF bytes | |
83 | * UBI_IO_BAD_EC_HDR: the erase counter header is corrupted (bad magic or CRC) | |
84 | * UBI_IO_BAD_VID_HDR: the volume identifier header is corrupted (bad magic or | |
85 | * CRC) | |
86 | * UBI_IO_BITFLIPS: bit-flips were detected and corrected | |
87 | */ | |
88 | enum { | |
89 | UBI_IO_PEB_EMPTY = 1, | |
90 | UBI_IO_PEB_FREE, | |
91 | UBI_IO_BAD_EC_HDR, | |
92 | UBI_IO_BAD_VID_HDR, | |
93 | UBI_IO_BITFLIPS | |
94 | }; | |
95 | ||
06b68ba1 AB |
96 | /** |
97 | * struct ubi_wl_entry - wear-leveling entry. | |
98 | * @rb: link in the corresponding RB-tree | |
99 | * @ec: erase counter | |
100 | * @pnum: physical eraseblock number | |
101 | * | |
102 | * This data structure is used in the WL unit. Each physical eraseblock has a | |
103 | * corresponding &struct wl_entry object which may be kept in different | |
104 | * RB-trees. See WL unit for details. | |
105 | */ | |
106 | struct ubi_wl_entry { | |
107 | struct rb_node rb; | |
108 | int ec; | |
109 | int pnum; | |
110 | }; | |
111 | ||
3a8d4642 AB |
112 | /** |
113 | * struct ubi_ltree_entry - an entry in the lock tree. | |
114 | * @rb: links RB-tree nodes | |
115 | * @vol_id: volume ID of the locked logical eraseblock | |
116 | * @lnum: locked logical eraseblock number | |
117 | * @users: how many tasks are using this logical eraseblock or wait for it | |
118 | * @mutex: read/write mutex to implement read/write access serialization to | |
119 | * the (@vol_id, @lnum) logical eraseblock | |
120 | * | |
121 | * This data structure is used in the EBA unit to implement per-LEB locking. | |
122 | * When a logical eraseblock is being locked - corresponding | |
123 | * &struct ubi_ltree_entry object is inserted to the lock tree (@ubi->ltree). | |
124 | * See EBA unit for details. | |
125 | */ | |
126 | struct ubi_ltree_entry { | |
127 | struct rb_node rb; | |
128 | int vol_id; | |
129 | int lnum; | |
130 | int users; | |
131 | struct rw_semaphore mutex; | |
132 | }; | |
133 | ||
801c135c AB |
134 | struct ubi_volume_desc; |
135 | ||
136 | /** | |
137 | * struct ubi_volume - UBI volume description data structure. | |
138 | * @dev: device object to make use of the the Linux device model | |
139 | * @cdev: character device object to create character device | |
140 | * @ubi: reference to the UBI device description object | |
141 | * @vol_id: volume ID | |
d05c77a8 | 142 | * @ref_count: volume reference count |
801c135c AB |
143 | * @readers: number of users holding this volume in read-only mode |
144 | * @writers: number of users holding this volume in read-write mode | |
145 | * @exclusive: whether somebody holds this volume in exclusive mode | |
801c135c AB |
146 | * |
147 | * @reserved_pebs: how many physical eraseblocks are reserved for this volume | |
148 | * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME) | |
149 | * @usable_leb_size: logical eraseblock size without padding | |
150 | * @used_ebs: how many logical eraseblocks in this volume contain data | |
151 | * @last_eb_bytes: how many bytes are stored in the last logical eraseblock | |
152 | * @used_bytes: how many bytes of data this volume contains | |
801c135c AB |
153 | * @alignment: volume alignment |
154 | * @data_pad: how many bytes are not used at the end of physical eraseblocks to | |
d05c77a8 | 155 | * satisfy the requested alignment |
801c135c AB |
156 | * @name_len: volume name length |
157 | * @name: volume name | |
158 | * | |
801c135c | 159 | * @upd_ebs: how many eraseblocks are expected to be updated |
e653879c AB |
160 | * @ch_lnum: LEB number which is being changing by the atomic LEB change |
161 | * operation | |
162 | * @ch_dtype: data persistency type which is being changing by the atomic LEB | |
163 | * change operation | |
164 | * @upd_bytes: how many bytes are expected to be received for volume update or | |
165 | * atomic LEB change | |
166 | * @upd_received: how many bytes were already received for volume update or | |
167 | * atomic LEB change | |
168 | * @upd_buf: update buffer which is used to collect update data or data for | |
169 | * atomic LEB change | |
801c135c AB |
170 | * |
171 | * @eba_tbl: EBA table of this volume (LEB->PEB mapping) | |
896c0c06 AB |
172 | * @checked: %1 if this static volume was checked |
173 | * @corrupted: %1 if the volume is corrupted (static volumes only) | |
174 | * @upd_marker: %1 if the update marker is set for this volume | |
175 | * @updating: %1 if the volume is being updated | |
e653879c | 176 | * @changing_leb: %1 if the atomic LEB change ioctl command is in progress |
801c135c AB |
177 | * |
178 | * @gluebi_desc: gluebi UBI volume descriptor | |
179 | * @gluebi_refcount: reference count of the gluebi MTD device | |
180 | * @gluebi_mtd: MTD device description object of the gluebi MTD device | |
181 | * | |
182 | * The @corrupted field indicates that the volume's contents is corrupted. | |
183 | * Since UBI protects only static volumes, this field is not relevant to | |
184 | * dynamic volumes - it is user's responsibility to assure their data | |
185 | * integrity. | |
186 | * | |
187 | * The @upd_marker flag indicates that this volume is either being updated at | |
188 | * the moment or is damaged because of an unclean reboot. | |
189 | */ | |
190 | struct ubi_volume { | |
191 | struct device dev; | |
192 | struct cdev cdev; | |
193 | struct ubi_device *ubi; | |
194 | int vol_id; | |
d05c77a8 | 195 | int ref_count; |
801c135c AB |
196 | int readers; |
197 | int writers; | |
198 | int exclusive; | |
801c135c AB |
199 | |
200 | int reserved_pebs; | |
201 | int vol_type; | |
202 | int usable_leb_size; | |
203 | int used_ebs; | |
204 | int last_eb_bytes; | |
205 | long long used_bytes; | |
801c135c AB |
206 | int alignment; |
207 | int data_pad; | |
208 | int name_len; | |
209 | char name[UBI_VOL_NAME_MAX+1]; | |
210 | ||
801c135c | 211 | int upd_ebs; |
e653879c AB |
212 | int ch_lnum; |
213 | int ch_dtype; | |
801c135c AB |
214 | long long upd_bytes; |
215 | long long upd_received; | |
216 | void *upd_buf; | |
217 | ||
218 | int *eba_tbl; | |
8eee9f10 HH |
219 | unsigned int checked:1; |
220 | unsigned int corrupted:1; | |
221 | unsigned int upd_marker:1; | |
222 | unsigned int updating:1; | |
223 | unsigned int changing_leb:1; | |
801c135c AB |
224 | |
225 | #ifdef CONFIG_MTD_UBI_GLUEBI | |
e653879c AB |
226 | /* |
227 | * Gluebi-related stuff may be compiled out. | |
228 | * TODO: this should not be built into UBI but should be a separate | |
229 | * ubimtd driver which works on top of UBI and emulates MTD devices. | |
230 | */ | |
801c135c AB |
231 | struct ubi_volume_desc *gluebi_desc; |
232 | int gluebi_refcount; | |
233 | struct mtd_info gluebi_mtd; | |
234 | #endif | |
235 | }; | |
236 | ||
237 | /** | |
238 | * struct ubi_volume_desc - descriptor of the UBI volume returned when it is | |
239 | * opened. | |
240 | * @vol: reference to the corresponding volume description object | |
241 | * @mode: open mode (%UBI_READONLY, %UBI_READWRITE, or %UBI_EXCLUSIVE) | |
242 | */ | |
243 | struct ubi_volume_desc { | |
244 | struct ubi_volume *vol; | |
245 | int mode; | |
246 | }; | |
247 | ||
248 | struct ubi_wl_entry; | |
249 | ||
250 | /** | |
251 | * struct ubi_device - UBI device description structure | |
9f961b57 | 252 | * @dev: UBI device object to use the the Linux device model |
801c135c AB |
253 | * @cdev: character device object to create character device |
254 | * @ubi_num: UBI device number | |
255 | * @ubi_name: UBI device name | |
801c135c AB |
256 | * @vol_count: number of volumes in this UBI device |
257 | * @volumes: volumes of this UBI device | |
258 | * @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs, | |
d05c77a8 AB |
259 | * @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count, |
260 | * @vol->readers, @vol->writers, @vol->exclusive, | |
261 | * @vol->ref_count, @vol->mapping and @vol->eba_tbl. | |
e73f4459 | 262 | * @ref_count: count of references on the UBI device |
801c135c AB |
263 | * |
264 | * @rsvd_pebs: count of reserved physical eraseblocks | |
265 | * @avail_pebs: count of available physical eraseblocks | |
266 | * @beb_rsvd_pebs: how many physical eraseblocks are reserved for bad PEB | |
4ccf8cff | 267 | * handling |
801c135c AB |
268 | * @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling |
269 | * | |
4ccf8cff AB |
270 | * @autoresize_vol_id: ID of the volume which has to be auto-resized at the end |
271 | * of UBI ititializetion | |
801c135c AB |
272 | * @vtbl_slots: how many slots are available in the volume table |
273 | * @vtbl_size: size of the volume table in bytes | |
274 | * @vtbl: in-RAM volume table copy | |
cae0a771 AB |
275 | * @volumes_mutex: protects on-flash volume table and serializes volume |
276 | * changes, like creation, deletion, update, resize | |
801c135c AB |
277 | * |
278 | * @max_ec: current highest erase counter value | |
279 | * @mean_ec: current mean erase counter value | |
280 | * | |
e8823bd6 | 281 | * @global_sqnum: global sequence number |
801c135c AB |
282 | * @ltree_lock: protects the lock tree and @global_sqnum |
283 | * @ltree: the lock tree | |
e8823bd6 | 284 | * @alc_mutex: serializes "atomic LEB change" operations |
801c135c AB |
285 | * |
286 | * @used: RB-tree of used physical eraseblocks | |
287 | * @free: RB-tree of free physical eraseblocks | |
288 | * @scrub: RB-tree of physical eraseblocks which need scrubbing | |
289 | * @prot: protection trees | |
290 | * @prot.pnum: protection tree indexed by physical eraseblock numbers | |
291 | * @prot.aec: protection tree indexed by absolute erase counter value | |
292 | * @wl_lock: protects the @used, @free, @prot, @lookuptbl, @abs_ec, @move_from, | |
d05c77a8 AB |
293 | * @move_to, @move_to_put @erase_pending, @wl_scheduled, and @works |
294 | * fields | |
43f9b25a | 295 | * @move_mutex: serializes eraseblock moves |
801c135c AB |
296 | * @wl_scheduled: non-zero if the wear-leveling was scheduled |
297 | * @lookuptbl: a table to quickly find a &struct ubi_wl_entry object for any | |
d05c77a8 | 298 | * physical eraseblock |
801c135c AB |
299 | * @abs_ec: absolute erase counter |
300 | * @move_from: physical eraseblock from where the data is being moved | |
301 | * @move_to: physical eraseblock where the data is being moved to | |
801c135c AB |
302 | * @move_to_put: if the "to" PEB was put |
303 | * @works: list of pending works | |
304 | * @works_count: count of pending works | |
305 | * @bgt_thread: background thread description object | |
306 | * @thread_enabled: if the background thread is enabled | |
307 | * @bgt_name: background thread name | |
308 | * | |
309 | * @flash_size: underlying MTD device size (in bytes) | |
310 | * @peb_count: count of physical eraseblocks on the MTD device | |
311 | * @peb_size: physical eraseblock size | |
312 | * @bad_peb_count: count of bad physical eraseblocks | |
313 | * @good_peb_count: count of good physical eraseblocks | |
314 | * @min_io_size: minimal input/output unit size of the underlying MTD device | |
315 | * @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers | |
316 | * @ro_mode: if the UBI device is in read-only mode | |
317 | * @leb_size: logical eraseblock size | |
318 | * @leb_start: starting offset of logical eraseblocks within physical | |
319 | * eraseblocks | |
320 | * @ec_hdr_alsize: size of the EC header aligned to @hdrs_min_io_size | |
321 | * @vid_hdr_alsize: size of the VID header aligned to @hdrs_min_io_size | |
322 | * @vid_hdr_offset: starting offset of the volume identifier header (might be | |
323 | * unaligned) | |
324 | * @vid_hdr_aloffset: starting offset of the VID header aligned to | |
325 | * @hdrs_min_io_size | |
326 | * @vid_hdr_shift: contains @vid_hdr_offset - @vid_hdr_aloffset | |
327 | * @bad_allowed: whether the MTD device admits of bad physical eraseblocks or | |
d05c77a8 | 328 | * not |
801c135c | 329 | * @mtd: MTD device descriptor |
e88d6e10 AB |
330 | * |
331 | * @peb_buf1: a buffer of PEB size used for different purposes | |
332 | * @peb_buf2: another buffer of PEB size used for different purposes | |
333 | * @buf_mutex: proptects @peb_buf1 and @peb_buf2 | |
d05c77a8 | 334 | * @dbg_peb_buf: buffer of PEB size used for debugging |
e88d6e10 | 335 | * @dbg_buf_mutex: proptects @dbg_peb_buf |
801c135c AB |
336 | */ |
337 | struct ubi_device { | |
338 | struct cdev cdev; | |
339 | struct device dev; | |
340 | int ubi_num; | |
341 | char ubi_name[sizeof(UBI_NAME_STR)+5]; | |
801c135c AB |
342 | int vol_count; |
343 | struct ubi_volume *volumes[UBI_MAX_VOLUMES+UBI_INT_VOL_COUNT]; | |
344 | spinlock_t volumes_lock; | |
e73f4459 | 345 | int ref_count; |
801c135c AB |
346 | |
347 | int rsvd_pebs; | |
348 | int avail_pebs; | |
349 | int beb_rsvd_pebs; | |
350 | int beb_rsvd_level; | |
351 | ||
4ccf8cff | 352 | int autoresize_vol_id; |
801c135c AB |
353 | int vtbl_slots; |
354 | int vtbl_size; | |
355 | struct ubi_vtbl_record *vtbl; | |
cae0a771 | 356 | struct mutex volumes_mutex; |
801c135c AB |
357 | |
358 | int max_ec; | |
4ccf8cff | 359 | /* TODO: mean_ec is not updated run-time, fix */ |
801c135c AB |
360 | int mean_ec; |
361 | ||
362 | /* EBA unit's stuff */ | |
363 | unsigned long long global_sqnum; | |
364 | spinlock_t ltree_lock; | |
365 | struct rb_root ltree; | |
e8823bd6 | 366 | struct mutex alc_mutex; |
801c135c AB |
367 | |
368 | /* Wear-leveling unit's stuff */ | |
369 | struct rb_root used; | |
370 | struct rb_root free; | |
371 | struct rb_root scrub; | |
372 | struct { | |
373 | struct rb_root pnum; | |
374 | struct rb_root aec; | |
375 | } prot; | |
376 | spinlock_t wl_lock; | |
43f9b25a | 377 | struct mutex move_mutex; |
593dd33c | 378 | struct rw_semaphore work_sem; |
801c135c AB |
379 | int wl_scheduled; |
380 | struct ubi_wl_entry **lookuptbl; | |
381 | unsigned long long abs_ec; | |
382 | struct ubi_wl_entry *move_from; | |
383 | struct ubi_wl_entry *move_to; | |
801c135c AB |
384 | int move_to_put; |
385 | struct list_head works; | |
386 | int works_count; | |
387 | struct task_struct *bgt_thread; | |
388 | int thread_enabled; | |
389 | char bgt_name[sizeof(UBI_BGT_NAME_PATTERN)+2]; | |
390 | ||
391 | /* I/O unit's stuff */ | |
392 | long long flash_size; | |
393 | int peb_count; | |
394 | int peb_size; | |
395 | int bad_peb_count; | |
396 | int good_peb_count; | |
397 | int min_io_size; | |
398 | int hdrs_min_io_size; | |
399 | int ro_mode; | |
400 | int leb_size; | |
401 | int leb_start; | |
402 | int ec_hdr_alsize; | |
403 | int vid_hdr_alsize; | |
404 | int vid_hdr_offset; | |
405 | int vid_hdr_aloffset; | |
406 | int vid_hdr_shift; | |
407 | int bad_allowed; | |
408 | struct mtd_info *mtd; | |
e88d6e10 AB |
409 | |
410 | void *peb_buf1; | |
411 | void *peb_buf2; | |
412 | struct mutex buf_mutex; | |
783b273a | 413 | struct mutex ckvol_mutex; |
e88d6e10 AB |
414 | #ifdef CONFIG_MTD_UBI_DEBUG |
415 | void *dbg_peb_buf; | |
416 | struct mutex dbg_buf_mutex; | |
417 | #endif | |
801c135c AB |
418 | }; |
419 | ||
06b68ba1 | 420 | extern struct kmem_cache *ubi_wl_entry_slab; |
9f961b57 | 421 | extern struct file_operations ubi_ctrl_cdev_operations; |
801c135c AB |
422 | extern struct file_operations ubi_cdev_operations; |
423 | extern struct file_operations ubi_vol_cdev_operations; | |
424 | extern struct class *ubi_class; | |
cdfa788a | 425 | extern struct mutex ubi_devices_mutex; |
801c135c AB |
426 | |
427 | /* vtbl.c */ | |
428 | int ubi_change_vtbl_record(struct ubi_device *ubi, int idx, | |
429 | struct ubi_vtbl_record *vtbl_rec); | |
430 | int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_scan_info *si); | |
431 | ||
432 | /* vmt.c */ | |
433 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req); | |
434 | int ubi_remove_volume(struct ubi_volume_desc *desc); | |
435 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs); | |
89b96b69 AB |
436 | int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol); |
437 | void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol); | |
801c135c AB |
438 | |
439 | /* upd.c */ | |
1b68d0ee AB |
440 | int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol, |
441 | long long bytes); | |
442 | int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol, | |
801c135c | 443 | const void __user *buf, int count); |
e653879c AB |
444 | int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, |
445 | const struct ubi_leb_change_req *req); | |
446 | int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol, | |
447 | const void __user *buf, int count); | |
801c135c AB |
448 | |
449 | /* misc.c */ | |
450 | int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf, int length); | |
451 | int ubi_check_volume(struct ubi_device *ubi, int vol_id); | |
452 | void ubi_calculate_reserved(struct ubi_device *ubi); | |
453 | ||
454 | /* gluebi.c */ | |
455 | #ifdef CONFIG_MTD_UBI_GLUEBI | |
456 | int ubi_create_gluebi(struct ubi_device *ubi, struct ubi_volume *vol); | |
457 | int ubi_destroy_gluebi(struct ubi_volume *vol); | |
941dfb07 | 458 | void ubi_gluebi_updated(struct ubi_volume *vol); |
801c135c AB |
459 | #else |
460 | #define ubi_create_gluebi(ubi, vol) 0 | |
461 | #define ubi_destroy_gluebi(vol) 0 | |
941dfb07 | 462 | #define ubi_gluebi_updated(vol) |
801c135c AB |
463 | #endif |
464 | ||
465 | /* eba.c */ | |
89b96b69 AB |
466 | int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, |
467 | int lnum); | |
468 | int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, | |
469 | void *buf, int offset, int len, int check); | |
470 | int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, | |
801c135c | 471 | const void *buf, int offset, int len, int dtype); |
89b96b69 AB |
472 | int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, |
473 | int lnum, const void *buf, int len, int dtype, | |
801c135c | 474 | int used_ebs); |
89b96b69 AB |
475 | int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, |
476 | int lnum, const void *buf, int len, int dtype); | |
801c135c AB |
477 | int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, |
478 | struct ubi_vid_hdr *vid_hdr); | |
479 | int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si); | |
801c135c AB |
480 | |
481 | /* wl.c */ | |
482 | int ubi_wl_get_peb(struct ubi_device *ubi, int dtype); | |
483 | int ubi_wl_put_peb(struct ubi_device *ubi, int pnum, int torture); | |
484 | int ubi_wl_flush(struct ubi_device *ubi); | |
485 | int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum); | |
486 | int ubi_wl_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si); | |
487 | void ubi_wl_close(struct ubi_device *ubi); | |
cdfa788a | 488 | int ubi_thread(void *u); |
801c135c AB |
489 | |
490 | /* io.c */ | |
491 | int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset, | |
492 | int len); | |
e88d6e10 AB |
493 | int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset, |
494 | int len); | |
495 | int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture); | |
801c135c AB |
496 | int ubi_io_is_bad(const struct ubi_device *ubi, int pnum); |
497 | int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum); | |
e88d6e10 | 498 | int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, |
801c135c | 499 | struct ubi_ec_hdr *ec_hdr, int verbose); |
e88d6e10 | 500 | int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum, |
801c135c | 501 | struct ubi_ec_hdr *ec_hdr); |
e88d6e10 | 502 | int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, |
801c135c | 503 | struct ubi_vid_hdr *vid_hdr, int verbose); |
e88d6e10 | 504 | int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, |
801c135c AB |
505 | struct ubi_vid_hdr *vid_hdr); |
506 | ||
e73f4459 | 507 | /* build.c */ |
897a316c | 508 | int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset); |
cdfa788a | 509 | int ubi_detach_mtd_dev(int ubi_num, int anyway); |
e73f4459 AB |
510 | struct ubi_device *ubi_get_device(int ubi_num); |
511 | void ubi_put_device(struct ubi_device *ubi); | |
512 | struct ubi_device *ubi_get_by_major(int major); | |
513 | int ubi_major2num(int major); | |
514 | ||
801c135c AB |
515 | /* |
516 | * ubi_rb_for_each_entry - walk an RB-tree. | |
517 | * @rb: a pointer to type 'struct rb_node' to to use as a loop counter | |
518 | * @pos: a pointer to RB-tree entry type to use as a loop counter | |
519 | * @root: RB-tree's root | |
520 | * @member: the name of the 'struct rb_node' within the RB-tree entry | |
521 | */ | |
522 | #define ubi_rb_for_each_entry(rb, pos, root, member) \ | |
523 | for (rb = rb_first(root), \ | |
524 | pos = (rb ? container_of(rb, typeof(*pos), member) : NULL); \ | |
525 | rb; \ | |
526 | rb = rb_next(rb), pos = container_of(rb, typeof(*pos), member)) | |
527 | ||
528 | /** | |
529 | * ubi_zalloc_vid_hdr - allocate a volume identifier header object. | |
530 | * @ubi: UBI device description object | |
33818bbb | 531 | * @gfp_flags: GFP flags to allocate with |
801c135c AB |
532 | * |
533 | * This function returns a pointer to the newly allocated and zero-filled | |
534 | * volume identifier header object in case of success and %NULL in case of | |
535 | * failure. | |
536 | */ | |
33818bbb AB |
537 | static inline struct ubi_vid_hdr * |
538 | ubi_zalloc_vid_hdr(const struct ubi_device *ubi, gfp_t gfp_flags) | |
801c135c AB |
539 | { |
540 | void *vid_hdr; | |
541 | ||
33818bbb | 542 | vid_hdr = kzalloc(ubi->vid_hdr_alsize, gfp_flags); |
801c135c AB |
543 | if (!vid_hdr) |
544 | return NULL; | |
545 | ||
546 | /* | |
547 | * VID headers may be stored at un-aligned flash offsets, so we shift | |
548 | * the pointer. | |
549 | */ | |
550 | return vid_hdr + ubi->vid_hdr_shift; | |
551 | } | |
552 | ||
553 | /** | |
554 | * ubi_free_vid_hdr - free a volume identifier header object. | |
555 | * @ubi: UBI device description object | |
556 | * @vid_hdr: the object to free | |
557 | */ | |
558 | static inline void ubi_free_vid_hdr(const struct ubi_device *ubi, | |
559 | struct ubi_vid_hdr *vid_hdr) | |
560 | { | |
561 | void *p = vid_hdr; | |
562 | ||
563 | if (!p) | |
564 | return; | |
565 | ||
566 | kfree(p - ubi->vid_hdr_shift); | |
567 | } | |
568 | ||
569 | /* | |
570 | * This function is equivalent to 'ubi_io_read()', but @offset is relative to | |
571 | * the beginning of the logical eraseblock, not to the beginning of the | |
572 | * physical eraseblock. | |
573 | */ | |
574 | static inline int ubi_io_read_data(const struct ubi_device *ubi, void *buf, | |
575 | int pnum, int offset, int len) | |
576 | { | |
577 | ubi_assert(offset >= 0); | |
578 | return ubi_io_read(ubi, buf, pnum, offset + ubi->leb_start, len); | |
579 | } | |
580 | ||
581 | /* | |
582 | * This function is equivalent to 'ubi_io_write()', but @offset is relative to | |
583 | * the beginning of the logical eraseblock, not to the beginning of the | |
584 | * physical eraseblock. | |
585 | */ | |
e88d6e10 | 586 | static inline int ubi_io_write_data(struct ubi_device *ubi, const void *buf, |
801c135c AB |
587 | int pnum, int offset, int len) |
588 | { | |
589 | ubi_assert(offset >= 0); | |
590 | return ubi_io_write(ubi, buf, pnum, offset + ubi->leb_start, len); | |
591 | } | |
592 | ||
593 | /** | |
594 | * ubi_ro_mode - switch to read-only mode. | |
595 | * @ubi: UBI device description object | |
596 | */ | |
597 | static inline void ubi_ro_mode(struct ubi_device *ubi) | |
598 | { | |
43f9b25a AB |
599 | if (!ubi->ro_mode) { |
600 | ubi->ro_mode = 1; | |
601 | ubi_warn("switch to read-only mode"); | |
602 | } | |
801c135c AB |
603 | } |
604 | ||
605 | /** | |
606 | * vol_id2idx - get table index by volume ID. | |
607 | * @ubi: UBI device description object | |
608 | * @vol_id: volume ID | |
609 | */ | |
610 | static inline int vol_id2idx(const struct ubi_device *ubi, int vol_id) | |
611 | { | |
612 | if (vol_id >= UBI_INTERNAL_VOL_START) | |
613 | return vol_id - UBI_INTERNAL_VOL_START + ubi->vtbl_slots; | |
614 | else | |
615 | return vol_id; | |
616 | } | |
617 | ||
618 | /** | |
619 | * idx2vol_id - get volume ID by table index. | |
620 | * @ubi: UBI device description object | |
621 | * @idx: table index | |
622 | */ | |
623 | static inline int idx2vol_id(const struct ubi_device *ubi, int idx) | |
624 | { | |
625 | if (idx >= ubi->vtbl_slots) | |
626 | return idx - ubi->vtbl_slots + UBI_INTERNAL_VOL_START; | |
627 | else | |
628 | return idx; | |
629 | } | |
630 | ||
631 | #endif /* !__UBI_UBI_H__ */ |