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