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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
19 | */ | |
20 | ||
21 | #ifndef __UBI_USER_H__ | |
22 | #define __UBI_USER_H__ | |
23 | ||
24 | /* | |
9b79cc0f AB |
25 | * UBI device creation (the same as MTD device attachment) |
26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
27 | * | |
28 | * MTD devices may be attached using %UBI_IOCATT ioctl command of the UBI | |
29 | * control device. The caller has to properly fill and pass | |
30 | * &struct ubi_attach_req object - UBI will attach the MTD device specified in | |
31 | * the request and return the newly created UBI device number as the ioctl | |
32 | * return value. | |
33 | * | |
34 | * UBI device deletion (the same as MTD device detachment) | |
35 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
36 | * | |
37 | * An UBI device maybe deleted with %UBI_IOCDET ioctl command of the UBI | |
38 | * control device. | |
39 | * | |
801c135c AB |
40 | * UBI volume creation |
41 | * ~~~~~~~~~~~~~~~~~~~ | |
42 | * | |
f7fc6f3f | 43 | * UBI volumes are created via the %UBI_IOCMKVOL ioctl command of UBI character |
801c135c | 44 | * device. A &struct ubi_mkvol_req object has to be properly filled and a |
f7fc6f3f | 45 | * pointer to it has to be passed to the ioctl. |
801c135c AB |
46 | * |
47 | * UBI volume deletion | |
48 | * ~~~~~~~~~~~~~~~~~~~ | |
49 | * | |
f7fc6f3f | 50 | * To delete a volume, the %UBI_IOCRMVOL ioctl command of the UBI character |
801c135c | 51 | * device should be used. A pointer to the 32-bit volume ID hast to be passed |
f7fc6f3f | 52 | * to the ioctl. |
801c135c AB |
53 | * |
54 | * UBI volume re-size | |
55 | * ~~~~~~~~~~~~~~~~~~ | |
56 | * | |
f7fc6f3f | 57 | * To re-size a volume, the %UBI_IOCRSVOL ioctl command of the UBI character |
801c135c | 58 | * device should be used. A &struct ubi_rsvol_req object has to be properly |
f7fc6f3f | 59 | * filled and a pointer to it has to be passed to the ioctl. |
801c135c | 60 | * |
f40ac9cd AB |
61 | * UBI volumes re-name |
62 | * ~~~~~~~~~~~~~~~~~~~ | |
63 | * | |
64 | * To re-name several volumes atomically at one go, the %UBI_IOCRNVOL command | |
65 | * of the UBI character device should be used. A &struct ubi_rnvol_req object | |
f7fc6f3f | 66 | * has to be properly filled and a pointer to it has to be passed to the ioctl. |
f40ac9cd | 67 | * |
801c135c AB |
68 | * UBI volume update |
69 | * ~~~~~~~~~~~~~~~~~ | |
70 | * | |
f7fc6f3f | 71 | * Volume update should be done via the %UBI_IOCVOLUP ioctl command of the |
801c135c | 72 | * corresponding UBI volume character device. A pointer to a 64-bit update |
f7fc6f3f | 73 | * size should be passed to the ioctl. After this, UBI expects user to write |
801c135c AB |
74 | * this number of bytes to the volume character device. The update is finished |
75 | * when the claimed number of bytes is passed. So, the volume update sequence | |
76 | * is something like: | |
77 | * | |
78 | * fd = open("/dev/my_volume"); | |
79 | * ioctl(fd, UBI_IOCVOLUP, &image_size); | |
80 | * write(fd, buf, image_size); | |
81 | * close(fd); | |
86613682 | 82 | * |
f7fc6f3f | 83 | * Logical eraseblock erase |
86613682 AB |
84 | * ~~~~~~~~~~~~~~~~~~~~~~~~ |
85 | * | |
f7fc6f3f AB |
86 | * To erase a logical eraseblock, the %UBI_IOCEBER ioctl command of the |
87 | * corresponding UBI volume character device should be used. This command | |
88 | * unmaps the requested logical eraseblock, makes sure the corresponding | |
89 | * physical eraseblock is successfully erased, and returns. | |
90 | * | |
91 | * Atomic logical eraseblock change | |
92 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
93 | * | |
94 | * Atomic logical eraseblock change operation is called using the %UBI_IOCEBCH | |
95 | * ioctl command of the corresponding UBI volume character device. A pointer to | |
96 | * a &struct ubi_leb_change_req object has to be passed to the ioctl. Then the | |
97 | * user is expected to write the requested amount of bytes (similarly to what | |
98 | * should be done in case of the "volume update" ioctl). | |
99 | * | |
100 | * Logical eraseblock map | |
101 | * ~~~~~~~~~~~~~~~~~~~~~ | |
102 | * | |
103 | * To map a logical eraseblock to a physical eraseblock, the %UBI_IOCEBMAP | |
104 | * ioctl command should be used. A pointer to a &struct ubi_map_req object is | |
105 | * expected to be passed. The ioctl maps the requested logical eraseblock to | |
106 | * a physical eraseblock and returns. Only non-mapped logical eraseblocks can | |
107 | * be mapped. If the logical eraseblock specified in the request is already | |
108 | * mapped to a physical eraseblock, the ioctl fails and returns error. | |
109 | * | |
110 | * Logical eraseblock unmap | |
111 | * ~~~~~~~~~~~~~~~~~~~~~~~~ | |
112 | * | |
113 | * To unmap a logical eraseblock to a physical eraseblock, the %UBI_IOCEBUNMAP | |
114 | * ioctl command should be used. The ioctl unmaps the logical eraseblocks, | |
115 | * schedules corresponding physical eraseblock for erasure, and returns. Unlike | |
116 | * the "LEB erase" command, it does not wait for the physical eraseblock being | |
117 | * erased. Note, the side effect of this is that if an unclean reboot happens | |
118 | * after the unmap ioctl returns, you may find the LEB mapped again to the same | |
119 | * physical eraseblock after the UBI is run again. | |
120 | * | |
121 | * Check if logical eraseblock is mapped | |
122 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
123 | * | |
124 | * To check if a logical eraseblock is mapped to a physical eraseblock, the | |
125 | * %UBI_IOCEBISMAP ioctl command should be used. It returns %0 if the LEB is | |
126 | * not mapped, and %1 if it is mapped. | |
801c135c AB |
127 | */ |
128 | ||
129 | /* | |
9b79cc0f AB |
130 | * When a new UBI volume or UBI device is created, users may either specify the |
131 | * volume/device number they want to create or to let UBI automatically assign | |
132 | * the number using these constants. | |
801c135c AB |
133 | */ |
134 | #define UBI_VOL_NUM_AUTO (-1) | |
9b79cc0f | 135 | #define UBI_DEV_NUM_AUTO (-1) |
801c135c AB |
136 | |
137 | /* Maximum volume name length */ | |
138 | #define UBI_MAX_VOLUME_NAME 127 | |
139 | ||
f7fc6f3f | 140 | /* ioctl commands of UBI character devices */ |
801c135c AB |
141 | |
142 | #define UBI_IOC_MAGIC 'o' | |
143 | ||
144 | /* Create an UBI volume */ | |
145 | #define UBI_IOCMKVOL _IOW(UBI_IOC_MAGIC, 0, struct ubi_mkvol_req) | |
146 | /* Remove an UBI volume */ | |
147 | #define UBI_IOCRMVOL _IOW(UBI_IOC_MAGIC, 1, int32_t) | |
148 | /* Re-size an UBI volume */ | |
149 | #define UBI_IOCRSVOL _IOW(UBI_IOC_MAGIC, 2, struct ubi_rsvol_req) | |
f40ac9cd AB |
150 | /* Re-name volumes */ |
151 | #define UBI_IOCRNVOL _IOW(UBI_IOC_MAGIC, 3, struct ubi_rnvol_req) | |
801c135c | 152 | |
f7fc6f3f | 153 | /* ioctl commands of the UBI control character device */ |
9b79cc0f AB |
154 | |
155 | #define UBI_CTRL_IOC_MAGIC 'o' | |
156 | ||
157 | /* Attach an MTD device */ | |
158 | #define UBI_IOCATT _IOW(UBI_CTRL_IOC_MAGIC, 64, struct ubi_attach_req) | |
159 | /* Detach an MTD device */ | |
160 | #define UBI_IOCDET _IOW(UBI_CTRL_IOC_MAGIC, 65, int32_t) | |
161 | ||
f7fc6f3f | 162 | /* ioctl commands of UBI volume character devices */ |
801c135c AB |
163 | |
164 | #define UBI_VOL_IOC_MAGIC 'O' | |
165 | ||
166 | /* Start UBI volume update */ | |
167 | #define UBI_IOCVOLUP _IOW(UBI_VOL_IOC_MAGIC, 0, int64_t) | |
f7fc6f3f | 168 | /* LEB erasure command, used for debugging, disabled by default */ |
801c135c | 169 | #define UBI_IOCEBER _IOW(UBI_VOL_IOC_MAGIC, 1, int32_t) |
f7fc6f3f | 170 | /* Atomic LEB change command */ |
86613682 | 171 | #define UBI_IOCEBCH _IOW(UBI_VOL_IOC_MAGIC, 2, int32_t) |
f7fc6f3f | 172 | /* Map LEB command */ |
141e6ebd | 173 | #define UBI_IOCEBMAP _IOW(UBI_VOL_IOC_MAGIC, 3, struct ubi_map_req) |
f7fc6f3f | 174 | /* Unmap LEB command */ |
c3da23be | 175 | #define UBI_IOCEBUNMAP _IOW(UBI_VOL_IOC_MAGIC, 4, int32_t) |
f7fc6f3f | 176 | /* Check if LEB is mapped command */ |
a27ce8f5 | 177 | #define UBI_IOCEBISMAP _IOR(UBI_VOL_IOC_MAGIC, 5, int32_t) |
801c135c | 178 | |
9b79cc0f AB |
179 | /* Maximum MTD device name length supported by UBI */ |
180 | #define MAX_UBI_MTD_NAME_LEN 127 | |
181 | ||
f40ac9cd AB |
182 | /* Maximum amount of UBI volumes that can be re-named at one go */ |
183 | #define UBI_MAX_RNVOL 32 | |
184 | ||
86613682 AB |
185 | /* |
186 | * UBI data type hint constants. | |
187 | * | |
188 | * UBI_LONGTERM: long-term data | |
189 | * UBI_SHORTTERM: short-term data | |
190 | * UBI_UNKNOWN: data persistence is unknown | |
191 | * | |
192 | * These constants are used when data is written to UBI volumes in order to | |
193 | * help the UBI wear-leveling unit to find more appropriate physical | |
194 | * eraseblocks. | |
195 | */ | |
196 | enum { | |
197 | UBI_LONGTERM = 1, | |
198 | UBI_SHORTTERM = 2, | |
199 | UBI_UNKNOWN = 3, | |
200 | }; | |
201 | ||
801c135c AB |
202 | /* |
203 | * UBI volume type constants. | |
204 | * | |
205 | * @UBI_DYNAMIC_VOLUME: dynamic volume | |
206 | * @UBI_STATIC_VOLUME: static volume | |
207 | */ | |
208 | enum { | |
209 | UBI_DYNAMIC_VOLUME = 3, | |
86613682 | 210 | UBI_STATIC_VOLUME = 4, |
9b79cc0f AB |
211 | }; |
212 | ||
213 | /** | |
214 | * struct ubi_attach_req - attach MTD device request. | |
215 | * @ubi_num: UBI device number to create | |
216 | * @mtd_num: MTD device number to attach | |
217 | * @vid_hdr_offset: VID header offset (use defaults if %0) | |
218 | * @padding: reserved for future, not used, has to be zeroed | |
219 | * | |
220 | * This data structure is used to specify MTD device UBI has to attach and the | |
221 | * parameters it has to use. The number which should be assigned to the new UBI | |
86613682 | 222 | * device is passed in @ubi_num. UBI may automatically assign the number if |
9b79cc0f AB |
223 | * @UBI_DEV_NUM_AUTO is passed. In this case, the device number is returned in |
224 | * @ubi_num. | |
225 | * | |
226 | * Most applications should pass %0 in @vid_hdr_offset to make UBI use default | |
227 | * offset of the VID header within physical eraseblocks. The default offset is | |
228 | * the next min. I/O unit after the EC header. For example, it will be offset | |
229 | * 512 in case of a 512 bytes page NAND flash with no sub-page support. Or | |
230 | * it will be 512 in case of a 2KiB page NAND flash with 4 512-byte sub-pages. | |
231 | * | |
232 | * But in rare cases, if this optimizes things, the VID header may be placed to | |
9c9ec147 AB |
233 | * a different offset. For example, the boot-loader might do things faster if |
234 | * the VID header sits at the end of the first 2KiB NAND page with 4 sub-pages. | |
235 | * As the boot-loader would not normally need to read EC headers (unless it | |
236 | * needs UBI in RW mode), it might be faster to calculate ECC. This is weird | |
237 | * example, but it real-life example. So, in this example, @vid_hdr_offer would | |
238 | * be 2KiB-64 bytes = 1984. Note, that this position is not even 512-bytes | |
239 | * aligned, which is OK, as UBI is clever enough to realize this is 4th | |
240 | * sub-page of the first page and add needed padding. | |
9b79cc0f AB |
241 | */ |
242 | struct ubi_attach_req { | |
243 | int32_t ubi_num; | |
244 | int32_t mtd_num; | |
245 | int32_t vid_hdr_offset; | |
f40ac9cd | 246 | int8_t padding[12]; |
801c135c AB |
247 | }; |
248 | ||
249 | /** | |
250 | * struct ubi_mkvol_req - volume description data structure used in | |
9b79cc0f | 251 | * volume creation requests. |
801c135c AB |
252 | * @vol_id: volume number |
253 | * @alignment: volume alignment | |
254 | * @bytes: volume size in bytes | |
255 | * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME) | |
9b79cc0f | 256 | * @padding1: reserved for future, not used, has to be zeroed |
801c135c | 257 | * @name_len: volume name length |
9b79cc0f | 258 | * @padding2: reserved for future, not used, has to be zeroed |
801c135c AB |
259 | * @name: volume name |
260 | * | |
86613682 | 261 | * This structure is used by user-space programs when creating new volumes. The |
801c135c AB |
262 | * @used_bytes field is only necessary when creating static volumes. |
263 | * | |
264 | * The @alignment field specifies the required alignment of the volume logical | |
265 | * eraseblock. This means, that the size of logical eraseblocks will be aligned | |
266 | * to this number, i.e., | |
267 | * (UBI device logical eraseblock size) mod (@alignment) = 0. | |
268 | * | |
269 | * To put it differently, the logical eraseblock of this volume may be slightly | |
270 | * shortened in order to make it properly aligned. The alignment has to be | |
271 | * multiple of the flash minimal input/output unit, or %1 to utilize the entire | |
272 | * available space of logical eraseblocks. | |
273 | * | |
274 | * The @alignment field may be useful, for example, when one wants to maintain | |
275 | * a block device on top of an UBI volume. In this case, it is desirable to fit | |
276 | * an integer number of blocks in logical eraseblocks of this UBI volume. With | |
277 | * alignment it is possible to update this volume using plane UBI volume image | |
278 | * BLOBs, without caring about how to properly align them. | |
279 | */ | |
280 | struct ubi_mkvol_req { | |
281 | int32_t vol_id; | |
282 | int32_t alignment; | |
283 | int64_t bytes; | |
284 | int8_t vol_type; | |
285 | int8_t padding1; | |
286 | int16_t name_len; | |
287 | int8_t padding2[4]; | |
9b79cc0f | 288 | char name[UBI_MAX_VOLUME_NAME + 1]; |
801c135c AB |
289 | } __attribute__ ((packed)); |
290 | ||
291 | /** | |
292 | * struct ubi_rsvol_req - a data structure used in volume re-size requests. | |
293 | * @vol_id: ID of the volume to re-size | |
294 | * @bytes: new size of the volume in bytes | |
295 | * | |
296 | * Re-sizing is possible for both dynamic and static volumes. But while dynamic | |
297 | * volumes may be re-sized arbitrarily, static volumes cannot be made to be | |
025dfdaf | 298 | * smaller than the number of bytes they bear. To arbitrarily shrink a static |
801c135c AB |
299 | * volume, it must be wiped out first (by means of volume update operation with |
300 | * zero number of bytes). | |
301 | */ | |
302 | struct ubi_rsvol_req { | |
303 | int64_t bytes; | |
304 | int32_t vol_id; | |
305 | } __attribute__ ((packed)); | |
306 | ||
f40ac9cd AB |
307 | /** |
308 | * struct ubi_rnvol_req - volumes re-name request. | |
309 | * @count: count of volumes to re-name | |
310 | * @padding1: reserved for future, not used, has to be zeroed | |
311 | * @vol_id: ID of the volume to re-name | |
312 | * @name_len: name length | |
313 | * @padding2: reserved for future, not used, has to be zeroed | |
314 | * @name: new volume name | |
315 | * | |
316 | * UBI allows to re-name up to %32 volumes at one go. The count of volumes to | |
317 | * re-name is specified in the @count field. The ID of the volumes to re-name | |
318 | * and the new names are specified in the @vol_id and @name fields. | |
319 | * | |
320 | * The UBI volume re-name operation is atomic, which means that should power cut | |
321 | * happen, the volumes will have either old name or new name. So the possible | |
322 | * use-cases of this command is atomic upgrade. Indeed, to upgrade, say, volumes | |
323 | * A and B one may create temporary volumes %A1 and %B1 with the new contents, | |
324 | * then atomically re-name A1->A and B1->B, in which case old %A and %B will | |
325 | * be removed. | |
326 | * | |
327 | * If it is not desirable to remove old A and B, the re-name request has to | |
328 | * contain 4 entries: A1->A, A->A1, B1->B, B->B1, in which case old A1 and B1 | |
329 | * become A and B, and old A and B will become A1 and B1. | |
330 | * | |
331 | * It is also OK to request: A1->A, A1->X, B1->B, B->Y, in which case old A1 | |
332 | * and B1 become A and B, and old A and B become X and Y. | |
333 | * | |
334 | * In other words, in case of re-naming into an existing volume name, the | |
335 | * existing volume is removed, unless it is re-named as well at the same | |
336 | * re-name request. | |
337 | */ | |
338 | struct ubi_rnvol_req { | |
339 | int32_t count; | |
340 | int8_t padding1[12]; | |
341 | struct { | |
342 | int32_t vol_id; | |
343 | int16_t name_len; | |
344 | int8_t padding2[2]; | |
345 | char name[UBI_MAX_VOLUME_NAME + 1]; | |
346 | } ents[UBI_MAX_RNVOL]; | |
347 | } __attribute__ ((packed)); | |
348 | ||
86613682 | 349 | /** |
f7fc6f3f AB |
350 | * struct ubi_leb_change_req - a data structure used in atomic LEB change |
351 | * requests. | |
86613682 AB |
352 | * @lnum: logical eraseblock number to change |
353 | * @bytes: how many bytes will be written to the logical eraseblock | |
354 | * @dtype: data type (%UBI_LONGTERM, %UBI_SHORTTERM, %UBI_UNKNOWN) | |
355 | * @padding: reserved for future, not used, has to be zeroed | |
356 | */ | |
357 | struct ubi_leb_change_req { | |
358 | int32_t lnum; | |
359 | int32_t bytes; | |
f40ac9cd AB |
360 | int8_t dtype; |
361 | int8_t padding[7]; | |
86613682 AB |
362 | } __attribute__ ((packed)); |
363 | ||
141e6ebd | 364 | /** |
f7fc6f3f | 365 | * struct ubi_map_req - a data structure used in map LEB requests. |
141e6ebd CC |
366 | * @lnum: logical eraseblock number to unmap |
367 | * @dtype: data type (%UBI_LONGTERM, %UBI_SHORTTERM, %UBI_UNKNOWN) | |
368 | * @padding: reserved for future, not used, has to be zeroed | |
369 | */ | |
370 | struct ubi_map_req { | |
371 | int32_t lnum; | |
372 | int8_t dtype; | |
373 | int8_t padding[3]; | |
374 | } __attribute__ ((packed)); | |
375 | ||
801c135c | 376 | #endif /* __UBI_USER_H__ */ |