Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 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 | /* |
Artem Bityutskiy | 85c6e6e | 2008-07-16 10:25:56 +0300 | [diff] [blame] | 22 | * The UBI Eraseblock Association (EBA) sub-system. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 23 | * |
Artem Bityutskiy | 85c6e6e | 2008-07-16 10:25:56 +0300 | [diff] [blame] | 24 | * This sub-system is responsible for I/O to/from logical eraseblock. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 25 | * |
| 26 | * Although in this implementation the EBA table is fully kept and managed in |
| 27 | * RAM, which assumes poor scalability, it might be (partially) maintained on |
| 28 | * flash in future implementations. |
| 29 | * |
Artem Bityutskiy | 85c6e6e | 2008-07-16 10:25:56 +0300 | [diff] [blame] | 30 | * The EBA sub-system implements per-logical eraseblock locking. Before |
| 31 | * accessing a logical eraseblock it is locked for reading or writing. The |
| 32 | * per-logical eraseblock locking is implemented by means of the lock tree. The |
| 33 | * lock tree is an RB-tree which refers all the currently locked logical |
| 34 | * eraseblocks. The lock tree elements are &struct ubi_ltree_entry objects. |
| 35 | * They are indexed by (@vol_id, @lnum) pairs. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 36 | * |
| 37 | * EBA also maintains the global sequence counter which is incremented each |
| 38 | * time a logical eraseblock is mapped to a physical eraseblock and it is |
| 39 | * stored in the volume identifier header. This means that each VID header has |
| 40 | * a unique sequence number. The sequence number is only increased an we assume |
| 41 | * 64 bits is enough to never overflow. |
| 42 | */ |
| 43 | |
| 44 | #include <linux/slab.h> |
| 45 | #include <linux/crc32.h> |
| 46 | #include <linux/err.h> |
| 47 | #include "ubi.h" |
| 48 | |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 49 | /* Number of physical eraseblocks reserved for atomic LEB change operation */ |
| 50 | #define EBA_RESERVED_PEBS 1 |
| 51 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 52 | /** |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 53 | * next_sqnum - get next sequence number. |
| 54 | * @ubi: UBI device description object |
| 55 | * |
| 56 | * This function returns next sequence number to use, which is just the current |
| 57 | * global sequence counter value. It also increases the global sequence |
| 58 | * counter. |
| 59 | */ |
| 60 | static unsigned long long next_sqnum(struct ubi_device *ubi) |
| 61 | { |
| 62 | unsigned long long sqnum; |
| 63 | |
| 64 | spin_lock(&ubi->ltree_lock); |
| 65 | sqnum = ubi->global_sqnum++; |
| 66 | spin_unlock(&ubi->ltree_lock); |
| 67 | |
| 68 | return sqnum; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * ubi_get_compat - get compatibility flags of a volume. |
| 73 | * @ubi: UBI device description object |
| 74 | * @vol_id: volume ID |
| 75 | * |
| 76 | * This function returns compatibility flags for an internal volume. User |
| 77 | * volumes have no compatibility flags, so %0 is returned. |
| 78 | */ |
| 79 | static int ubi_get_compat(const struct ubi_device *ubi, int vol_id) |
| 80 | { |
Artem Bityutskiy | 91f2d53 | 2008-01-24 11:23:23 +0200 | [diff] [blame] | 81 | if (vol_id == UBI_LAYOUT_VOLUME_ID) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 82 | return UBI_LAYOUT_VOLUME_COMPAT; |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * ltree_lookup - look up the lock tree. |
| 88 | * @ubi: UBI device description object |
| 89 | * @vol_id: volume ID |
| 90 | * @lnum: logical eraseblock number |
| 91 | * |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 92 | * This function returns a pointer to the corresponding &struct ubi_ltree_entry |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 93 | * object if the logical eraseblock is locked and %NULL if it is not. |
| 94 | * @ubi->ltree_lock has to be locked. |
| 95 | */ |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 96 | static struct ubi_ltree_entry *ltree_lookup(struct ubi_device *ubi, int vol_id, |
| 97 | int lnum) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 98 | { |
| 99 | struct rb_node *p; |
| 100 | |
| 101 | p = ubi->ltree.rb_node; |
| 102 | while (p) { |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 103 | struct ubi_ltree_entry *le; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 104 | |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 105 | le = rb_entry(p, struct ubi_ltree_entry, rb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 106 | |
| 107 | if (vol_id < le->vol_id) |
| 108 | p = p->rb_left; |
| 109 | else if (vol_id > le->vol_id) |
| 110 | p = p->rb_right; |
| 111 | else { |
| 112 | if (lnum < le->lnum) |
| 113 | p = p->rb_left; |
| 114 | else if (lnum > le->lnum) |
| 115 | p = p->rb_right; |
| 116 | else |
| 117 | return le; |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | return NULL; |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * ltree_add_entry - add new entry to the lock tree. |
| 126 | * @ubi: UBI device description object |
| 127 | * @vol_id: volume ID |
| 128 | * @lnum: logical eraseblock number |
| 129 | * |
| 130 | * This function adds new entry for logical eraseblock (@vol_id, @lnum) to the |
| 131 | * lock tree. If such entry is already there, its usage counter is increased. |
| 132 | * Returns pointer to the lock tree entry or %-ENOMEM if memory allocation |
| 133 | * failed. |
| 134 | */ |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 135 | static struct ubi_ltree_entry *ltree_add_entry(struct ubi_device *ubi, |
| 136 | int vol_id, int lnum) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 137 | { |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 138 | struct ubi_ltree_entry *le, *le1, *le_free; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 139 | |
Artem Bityutskiy | b9a0662 | 2008-01-16 12:11:54 +0200 | [diff] [blame] | 140 | le = kmalloc(sizeof(struct ubi_ltree_entry), GFP_NOFS); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 141 | if (!le) |
| 142 | return ERR_PTR(-ENOMEM); |
| 143 | |
Artem Bityutskiy | b9a0662 | 2008-01-16 12:11:54 +0200 | [diff] [blame] | 144 | le->users = 0; |
| 145 | init_rwsem(&le->mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 146 | le->vol_id = vol_id; |
| 147 | le->lnum = lnum; |
| 148 | |
| 149 | spin_lock(&ubi->ltree_lock); |
| 150 | le1 = ltree_lookup(ubi, vol_id, lnum); |
| 151 | |
| 152 | if (le1) { |
| 153 | /* |
| 154 | * This logical eraseblock is already locked. The newly |
| 155 | * allocated lock entry is not needed. |
| 156 | */ |
| 157 | le_free = le; |
| 158 | le = le1; |
| 159 | } else { |
| 160 | struct rb_node **p, *parent = NULL; |
| 161 | |
| 162 | /* |
| 163 | * No lock entry, add the newly allocated one to the |
| 164 | * @ubi->ltree RB-tree. |
| 165 | */ |
| 166 | le_free = NULL; |
| 167 | |
| 168 | p = &ubi->ltree.rb_node; |
| 169 | while (*p) { |
| 170 | parent = *p; |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 171 | le1 = rb_entry(parent, struct ubi_ltree_entry, rb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 172 | |
| 173 | if (vol_id < le1->vol_id) |
| 174 | p = &(*p)->rb_left; |
| 175 | else if (vol_id > le1->vol_id) |
| 176 | p = &(*p)->rb_right; |
| 177 | else { |
| 178 | ubi_assert(lnum != le1->lnum); |
| 179 | if (lnum < le1->lnum) |
| 180 | p = &(*p)->rb_left; |
| 181 | else |
| 182 | p = &(*p)->rb_right; |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | rb_link_node(&le->rb, parent, p); |
| 187 | rb_insert_color(&le->rb, &ubi->ltree); |
| 188 | } |
| 189 | le->users += 1; |
| 190 | spin_unlock(&ubi->ltree_lock); |
| 191 | |
Artem Bityutskiy | 9c9ec14 | 2008-07-18 13:19:52 +0300 | [diff] [blame] | 192 | kfree(le_free); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 193 | return le; |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * leb_read_lock - lock logical eraseblock for reading. |
| 198 | * @ubi: UBI device description object |
| 199 | * @vol_id: volume ID |
| 200 | * @lnum: logical eraseblock number |
| 201 | * |
| 202 | * This function locks a logical eraseblock for reading. Returns zero in case |
| 203 | * of success and a negative error code in case of failure. |
| 204 | */ |
| 205 | static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum) |
| 206 | { |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 207 | struct ubi_ltree_entry *le; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 208 | |
| 209 | le = ltree_add_entry(ubi, vol_id, lnum); |
| 210 | if (IS_ERR(le)) |
| 211 | return PTR_ERR(le); |
| 212 | down_read(&le->mutex); |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * leb_read_unlock - unlock logical eraseblock. |
| 218 | * @ubi: UBI device description object |
| 219 | * @vol_id: volume ID |
| 220 | * @lnum: logical eraseblock number |
| 221 | */ |
| 222 | static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum) |
| 223 | { |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 224 | struct ubi_ltree_entry *le; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 225 | |
| 226 | spin_lock(&ubi->ltree_lock); |
| 227 | le = ltree_lookup(ubi, vol_id, lnum); |
| 228 | le->users -= 1; |
| 229 | ubi_assert(le->users >= 0); |
Artem Bityutskiy | 23add74 | 2008-06-16 13:35:23 +0300 | [diff] [blame] | 230 | up_read(&le->mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 231 | if (le->users == 0) { |
| 232 | rb_erase(&le->rb, &ubi->ltree); |
Artem Bityutskiy | 23add74 | 2008-06-16 13:35:23 +0300 | [diff] [blame] | 233 | kfree(le); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 234 | } |
| 235 | spin_unlock(&ubi->ltree_lock); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | /** |
| 239 | * leb_write_lock - lock logical eraseblock for writing. |
| 240 | * @ubi: UBI device description object |
| 241 | * @vol_id: volume ID |
| 242 | * @lnum: logical eraseblock number |
| 243 | * |
| 244 | * This function locks a logical eraseblock for writing. Returns zero in case |
| 245 | * of success and a negative error code in case of failure. |
| 246 | */ |
| 247 | static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum) |
| 248 | { |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 249 | struct ubi_ltree_entry *le; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 250 | |
| 251 | le = ltree_add_entry(ubi, vol_id, lnum); |
| 252 | if (IS_ERR(le)) |
| 253 | return PTR_ERR(le); |
| 254 | down_write(&le->mutex); |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | /** |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 259 | * leb_write_lock - lock logical eraseblock for writing. |
| 260 | * @ubi: UBI device description object |
| 261 | * @vol_id: volume ID |
| 262 | * @lnum: logical eraseblock number |
| 263 | * |
| 264 | * This function locks a logical eraseblock for writing if there is no |
| 265 | * contention and does nothing if there is contention. Returns %0 in case of |
| 266 | * success, %1 in case of contention, and and a negative error code in case of |
| 267 | * failure. |
| 268 | */ |
| 269 | static int leb_write_trylock(struct ubi_device *ubi, int vol_id, int lnum) |
| 270 | { |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 271 | struct ubi_ltree_entry *le; |
| 272 | |
| 273 | le = ltree_add_entry(ubi, vol_id, lnum); |
| 274 | if (IS_ERR(le)) |
| 275 | return PTR_ERR(le); |
| 276 | if (down_write_trylock(&le->mutex)) |
| 277 | return 0; |
| 278 | |
| 279 | /* Contention, cancel */ |
| 280 | spin_lock(&ubi->ltree_lock); |
| 281 | le->users -= 1; |
| 282 | ubi_assert(le->users >= 0); |
| 283 | if (le->users == 0) { |
| 284 | rb_erase(&le->rb, &ubi->ltree); |
Artem Bityutskiy | b9a0662 | 2008-01-16 12:11:54 +0200 | [diff] [blame] | 285 | kfree(le); |
Artem Bityutskiy | 23add74 | 2008-06-16 13:35:23 +0300 | [diff] [blame] | 286 | } |
| 287 | spin_unlock(&ubi->ltree_lock); |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 288 | |
| 289 | return 1; |
| 290 | } |
| 291 | |
| 292 | /** |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 293 | * leb_write_unlock - unlock logical eraseblock. |
| 294 | * @ubi: UBI device description object |
| 295 | * @vol_id: volume ID |
| 296 | * @lnum: logical eraseblock number |
| 297 | */ |
| 298 | static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum) |
| 299 | { |
Artem Bityutskiy | 3a8d464 | 2007-12-16 12:32:51 +0200 | [diff] [blame] | 300 | struct ubi_ltree_entry *le; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 301 | |
| 302 | spin_lock(&ubi->ltree_lock); |
| 303 | le = ltree_lookup(ubi, vol_id, lnum); |
| 304 | le->users -= 1; |
| 305 | ubi_assert(le->users >= 0); |
Artem Bityutskiy | 23add74 | 2008-06-16 13:35:23 +0300 | [diff] [blame] | 306 | up_write(&le->mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 307 | if (le->users == 0) { |
| 308 | rb_erase(&le->rb, &ubi->ltree); |
Artem Bityutskiy | b9a0662 | 2008-01-16 12:11:54 +0200 | [diff] [blame] | 309 | kfree(le); |
Artem Bityutskiy | 23add74 | 2008-06-16 13:35:23 +0300 | [diff] [blame] | 310 | } |
| 311 | spin_unlock(&ubi->ltree_lock); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | /** |
| 315 | * ubi_eba_unmap_leb - un-map logical eraseblock. |
| 316 | * @ubi: UBI device description object |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 317 | * @vol: volume description object |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 318 | * @lnum: logical eraseblock number |
| 319 | * |
| 320 | * This function un-maps logical eraseblock @lnum and schedules corresponding |
| 321 | * physical eraseblock for erasure. Returns zero in case of success and a |
| 322 | * negative error code in case of failure. |
| 323 | */ |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 324 | int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, |
| 325 | int lnum) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 326 | { |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 327 | int err, pnum, vol_id = vol->vol_id; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 328 | |
| 329 | if (ubi->ro_mode) |
| 330 | return -EROFS; |
| 331 | |
| 332 | err = leb_write_lock(ubi, vol_id, lnum); |
| 333 | if (err) |
| 334 | return err; |
| 335 | |
| 336 | pnum = vol->eba_tbl[lnum]; |
| 337 | if (pnum < 0) |
| 338 | /* This logical eraseblock is already unmapped */ |
| 339 | goto out_unlock; |
| 340 | |
| 341 | dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum); |
| 342 | |
| 343 | vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED; |
| 344 | err = ubi_wl_put_peb(ubi, pnum, 0); |
| 345 | |
| 346 | out_unlock: |
| 347 | leb_write_unlock(ubi, vol_id, lnum); |
| 348 | return err; |
| 349 | } |
| 350 | |
| 351 | /** |
| 352 | * ubi_eba_read_leb - read data. |
| 353 | * @ubi: UBI device description object |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 354 | * @vol: volume description object |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 355 | * @lnum: logical eraseblock number |
| 356 | * @buf: buffer to store the read data |
| 357 | * @offset: offset from where to read |
| 358 | * @len: how many bytes to read |
| 359 | * @check: data CRC check flag |
| 360 | * |
| 361 | * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF |
| 362 | * bytes. The @check flag only makes sense for static volumes and forces |
| 363 | * eraseblock data CRC checking. |
| 364 | * |
| 365 | * In case of success this function returns zero. In case of a static volume, |
| 366 | * if data CRC mismatches - %-EBADMSG is returned. %-EBADMSG may also be |
| 367 | * returned for any volume type if an ECC error was detected by the MTD device |
| 368 | * driver. Other negative error cored may be returned in case of other errors. |
| 369 | */ |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 370 | int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
| 371 | void *buf, int offset, int len, int check) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 372 | { |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 373 | int err, pnum, scrub = 0, vol_id = vol->vol_id; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 374 | struct ubi_vid_hdr *vid_hdr; |
Jeff Garzik | a6343af | 2007-07-17 05:39:58 -0400 | [diff] [blame] | 375 | uint32_t uninitialized_var(crc); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 376 | |
| 377 | err = leb_read_lock(ubi, vol_id, lnum); |
| 378 | if (err) |
| 379 | return err; |
| 380 | |
| 381 | pnum = vol->eba_tbl[lnum]; |
| 382 | if (pnum < 0) { |
| 383 | /* |
| 384 | * The logical eraseblock is not mapped, fill the whole buffer |
| 385 | * with 0xFF bytes. The exception is static volumes for which |
| 386 | * it is an error to read unmapped logical eraseblocks. |
| 387 | */ |
| 388 | dbg_eba("read %d bytes from offset %d of LEB %d:%d (unmapped)", |
| 389 | len, offset, vol_id, lnum); |
| 390 | leb_read_unlock(ubi, vol_id, lnum); |
| 391 | ubi_assert(vol->vol_type != UBI_STATIC_VOLUME); |
| 392 | memset(buf, 0xFF, len); |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | dbg_eba("read %d bytes from offset %d of LEB %d:%d, PEB %d", |
| 397 | len, offset, vol_id, lnum, pnum); |
| 398 | |
| 399 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
| 400 | check = 0; |
| 401 | |
| 402 | retry: |
| 403 | if (check) { |
Artem Bityutskiy | 33818bb | 2007-08-28 21:29:32 +0300 | [diff] [blame] | 404 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 405 | if (!vid_hdr) { |
| 406 | err = -ENOMEM; |
| 407 | goto out_unlock; |
| 408 | } |
| 409 | |
| 410 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); |
| 411 | if (err && err != UBI_IO_BITFLIPS) { |
| 412 | if (err > 0) { |
| 413 | /* |
| 414 | * The header is either absent or corrupted. |
| 415 | * The former case means there is a bug - |
| 416 | * switch to read-only mode just in case. |
| 417 | * The latter case means a real corruption - we |
| 418 | * may try to recover data. FIXME: but this is |
| 419 | * not implemented. |
| 420 | */ |
| 421 | if (err == UBI_IO_BAD_VID_HDR) { |
| 422 | ubi_warn("bad VID header at PEB %d, LEB" |
| 423 | "%d:%d", pnum, vol_id, lnum); |
| 424 | err = -EBADMSG; |
| 425 | } else |
| 426 | ubi_ro_mode(ubi); |
| 427 | } |
| 428 | goto out_free; |
| 429 | } else if (err == UBI_IO_BITFLIPS) |
| 430 | scrub = 1; |
| 431 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 432 | ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs)); |
| 433 | ubi_assert(len == be32_to_cpu(vid_hdr->data_size)); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 434 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 435 | crc = be32_to_cpu(vid_hdr->data_crc); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 436 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 437 | } |
| 438 | |
| 439 | err = ubi_io_read_data(ubi, buf, pnum, offset, len); |
| 440 | if (err) { |
| 441 | if (err == UBI_IO_BITFLIPS) { |
| 442 | scrub = 1; |
| 443 | err = 0; |
| 444 | } else if (err == -EBADMSG) { |
| 445 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
| 446 | goto out_unlock; |
| 447 | scrub = 1; |
| 448 | if (!check) { |
| 449 | ubi_msg("force data checking"); |
| 450 | check = 1; |
| 451 | goto retry; |
| 452 | } |
| 453 | } else |
| 454 | goto out_unlock; |
| 455 | } |
| 456 | |
| 457 | if (check) { |
Jeff Garzik | 2ab934b | 2007-07-17 01:49:56 -0400 | [diff] [blame] | 458 | uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 459 | if (crc1 != crc) { |
| 460 | ubi_warn("CRC error: calculated %#08x, must be %#08x", |
| 461 | crc1, crc); |
| 462 | err = -EBADMSG; |
| 463 | goto out_unlock; |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | if (scrub) |
| 468 | err = ubi_wl_scrub_peb(ubi, pnum); |
| 469 | |
| 470 | leb_read_unlock(ubi, vol_id, lnum); |
| 471 | return err; |
| 472 | |
| 473 | out_free: |
| 474 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 475 | out_unlock: |
| 476 | leb_read_unlock(ubi, vol_id, lnum); |
| 477 | return err; |
| 478 | } |
| 479 | |
| 480 | /** |
| 481 | * recover_peb - recover from write failure. |
| 482 | * @ubi: UBI device description object |
| 483 | * @pnum: the physical eraseblock to recover |
| 484 | * @vol_id: volume ID |
| 485 | * @lnum: logical eraseblock number |
| 486 | * @buf: data which was not written because of the write failure |
| 487 | * @offset: offset of the failed write |
| 488 | * @len: how many bytes should have been written |
| 489 | * |
| 490 | * This function is called in case of a write failure and moves all good data |
| 491 | * from the potentially bad physical eraseblock to a good physical eraseblock. |
| 492 | * This function also writes the data which was not written due to the failure. |
| 493 | * Returns new physical eraseblock number in case of success, and a negative |
| 494 | * error code in case of failure. |
| 495 | */ |
| 496 | static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, |
| 497 | const void *buf, int offset, int len) |
| 498 | { |
| 499 | int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0; |
| 500 | struct ubi_volume *vol = ubi->volumes[idx]; |
| 501 | struct ubi_vid_hdr *vid_hdr; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 502 | |
Artem Bityutskiy | 33818bb | 2007-08-28 21:29:32 +0300 | [diff] [blame] | 503 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
Artem Bityutskiy | 9c9ec14 | 2008-07-18 13:19:52 +0300 | [diff] [blame] | 504 | if (!vid_hdr) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 505 | return -ENOMEM; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 506 | |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 507 | mutex_lock(&ubi->buf_mutex); |
| 508 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 509 | retry: |
| 510 | new_pnum = ubi_wl_get_peb(ubi, UBI_UNKNOWN); |
| 511 | if (new_pnum < 0) { |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 512 | mutex_unlock(&ubi->buf_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 513 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 514 | return new_pnum; |
| 515 | } |
| 516 | |
| 517 | ubi_msg("recover PEB %d, move data to PEB %d", pnum, new_pnum); |
| 518 | |
| 519 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); |
| 520 | if (err && err != UBI_IO_BITFLIPS) { |
| 521 | if (err > 0) |
| 522 | err = -EIO; |
| 523 | goto out_put; |
| 524 | } |
| 525 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 526 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 527 | err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr); |
| 528 | if (err) |
| 529 | goto write_error; |
| 530 | |
| 531 | data_size = offset + len; |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 532 | memset(ubi->peb_buf1 + offset, 0xFF, len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 533 | |
| 534 | /* Read everything before the area where the write failure happened */ |
| 535 | if (offset > 0) { |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 536 | err = ubi_io_read_data(ubi, ubi->peb_buf1, pnum, 0, offset); |
| 537 | if (err && err != UBI_IO_BITFLIPS) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 538 | goto out_put; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 539 | } |
| 540 | |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 541 | memcpy(ubi->peb_buf1 + offset, buf, len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 542 | |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 543 | err = ubi_io_write_data(ubi, ubi->peb_buf1, new_pnum, 0, data_size); |
| 544 | if (err) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 545 | goto write_error; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 546 | |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 547 | mutex_unlock(&ubi->buf_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 548 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 549 | |
| 550 | vol->eba_tbl[lnum] = new_pnum; |
| 551 | ubi_wl_put_peb(ubi, pnum, 1); |
| 552 | |
| 553 | ubi_msg("data was successfully recovered"); |
| 554 | return 0; |
| 555 | |
| 556 | out_put: |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 557 | mutex_unlock(&ubi->buf_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 558 | ubi_wl_put_peb(ubi, new_pnum, 1); |
| 559 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 560 | return err; |
| 561 | |
| 562 | write_error: |
| 563 | /* |
| 564 | * Bad luck? This physical eraseblock is bad too? Crud. Let's try to |
| 565 | * get another one. |
| 566 | */ |
| 567 | ubi_warn("failed to write to PEB %d", new_pnum); |
| 568 | ubi_wl_put_peb(ubi, new_pnum, 1); |
| 569 | if (++tries > UBI_IO_RETRIES) { |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 570 | mutex_unlock(&ubi->buf_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 571 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 572 | return err; |
| 573 | } |
| 574 | ubi_msg("try again"); |
| 575 | goto retry; |
| 576 | } |
| 577 | |
| 578 | /** |
| 579 | * ubi_eba_write_leb - write data to dynamic volume. |
| 580 | * @ubi: UBI device description object |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 581 | * @vol: volume description object |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 582 | * @lnum: logical eraseblock number |
| 583 | * @buf: the data to write |
| 584 | * @offset: offset within the logical eraseblock where to write |
| 585 | * @len: how many bytes to write |
| 586 | * @dtype: data type |
| 587 | * |
| 588 | * This function writes data to logical eraseblock @lnum of a dynamic volume |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 589 | * @vol. Returns zero in case of success and a negative error code in case |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 590 | * of failure. In case of error, it is possible that something was still |
| 591 | * written to the flash media, but may be some garbage. |
| 592 | */ |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 593 | int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 594 | const void *buf, int offset, int len, int dtype) |
| 595 | { |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 596 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 597 | struct ubi_vid_hdr *vid_hdr; |
| 598 | |
| 599 | if (ubi->ro_mode) |
| 600 | return -EROFS; |
| 601 | |
| 602 | err = leb_write_lock(ubi, vol_id, lnum); |
| 603 | if (err) |
| 604 | return err; |
| 605 | |
| 606 | pnum = vol->eba_tbl[lnum]; |
| 607 | if (pnum >= 0) { |
| 608 | dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d", |
| 609 | len, offset, vol_id, lnum, pnum); |
| 610 | |
| 611 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); |
| 612 | if (err) { |
| 613 | ubi_warn("failed to write data to PEB %d", pnum); |
| 614 | if (err == -EIO && ubi->bad_allowed) |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 615 | err = recover_peb(ubi, pnum, vol_id, lnum, buf, |
| 616 | offset, len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 617 | if (err) |
| 618 | ubi_ro_mode(ubi); |
| 619 | } |
| 620 | leb_write_unlock(ubi, vol_id, lnum); |
| 621 | return err; |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * The logical eraseblock is not mapped. We have to get a free physical |
| 626 | * eraseblock and write the volume identifier header there first. |
| 627 | */ |
Artem Bityutskiy | 33818bb | 2007-08-28 21:29:32 +0300 | [diff] [blame] | 628 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 629 | if (!vid_hdr) { |
| 630 | leb_write_unlock(ubi, vol_id, lnum); |
| 631 | return -ENOMEM; |
| 632 | } |
| 633 | |
| 634 | vid_hdr->vol_type = UBI_VID_DYNAMIC; |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 635 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
| 636 | vid_hdr->vol_id = cpu_to_be32(vol_id); |
| 637 | vid_hdr->lnum = cpu_to_be32(lnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 638 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 639 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 640 | |
| 641 | retry: |
| 642 | pnum = ubi_wl_get_peb(ubi, dtype); |
| 643 | if (pnum < 0) { |
| 644 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 645 | leb_write_unlock(ubi, vol_id, lnum); |
| 646 | return pnum; |
| 647 | } |
| 648 | |
| 649 | dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d", |
| 650 | len, offset, vol_id, lnum, pnum); |
| 651 | |
| 652 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); |
| 653 | if (err) { |
| 654 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", |
| 655 | vol_id, lnum, pnum); |
| 656 | goto write_error; |
| 657 | } |
| 658 | |
Artem Bityutskiy | 393852e | 2007-12-06 18:47:30 +0200 | [diff] [blame] | 659 | if (len) { |
| 660 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); |
| 661 | if (err) { |
| 662 | ubi_warn("failed to write %d bytes at offset %d of " |
| 663 | "LEB %d:%d, PEB %d", len, offset, vol_id, |
| 664 | lnum, pnum); |
| 665 | goto write_error; |
| 666 | } |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 667 | } |
| 668 | |
| 669 | vol->eba_tbl[lnum] = pnum; |
| 670 | |
| 671 | leb_write_unlock(ubi, vol_id, lnum); |
| 672 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 673 | return 0; |
| 674 | |
| 675 | write_error: |
| 676 | if (err != -EIO || !ubi->bad_allowed) { |
| 677 | ubi_ro_mode(ubi); |
| 678 | leb_write_unlock(ubi, vol_id, lnum); |
| 679 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 680 | return err; |
| 681 | } |
| 682 | |
| 683 | /* |
| 684 | * Fortunately, this is the first write operation to this physical |
| 685 | * eraseblock, so just put it and request a new one. We assume that if |
| 686 | * this physical eraseblock went bad, the erase code will handle that. |
| 687 | */ |
| 688 | err = ubi_wl_put_peb(ubi, pnum, 1); |
| 689 | if (err || ++tries > UBI_IO_RETRIES) { |
| 690 | ubi_ro_mode(ubi); |
| 691 | leb_write_unlock(ubi, vol_id, lnum); |
| 692 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 693 | return err; |
| 694 | } |
| 695 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 696 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 697 | ubi_msg("try another PEB"); |
| 698 | goto retry; |
| 699 | } |
| 700 | |
| 701 | /** |
| 702 | * ubi_eba_write_leb_st - write data to static volume. |
| 703 | * @ubi: UBI device description object |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 704 | * @vol: volume description object |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 705 | * @lnum: logical eraseblock number |
| 706 | * @buf: data to write |
| 707 | * @len: how many bytes to write |
| 708 | * @dtype: data type |
| 709 | * @used_ebs: how many logical eraseblocks will this volume contain |
| 710 | * |
| 711 | * This function writes data to logical eraseblock @lnum of static volume |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 712 | * @vol. The @used_ebs argument should contain total number of logical |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 713 | * eraseblock in this static volume. |
| 714 | * |
| 715 | * When writing to the last logical eraseblock, the @len argument doesn't have |
| 716 | * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent |
| 717 | * to the real data size, although the @buf buffer has to contain the |
| 718 | * alignment. In all other cases, @len has to be aligned. |
| 719 | * |
| 720 | * It is prohibited to write more then once to logical eraseblocks of static |
| 721 | * volumes. This function returns zero in case of success and a negative error |
| 722 | * code in case of failure. |
| 723 | */ |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 724 | int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, |
| 725 | int lnum, const void *buf, int len, int dtype, |
| 726 | int used_ebs) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 727 | { |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 728 | int err, pnum, tries = 0, data_size = len, vol_id = vol->vol_id; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 729 | struct ubi_vid_hdr *vid_hdr; |
| 730 | uint32_t crc; |
| 731 | |
| 732 | if (ubi->ro_mode) |
| 733 | return -EROFS; |
| 734 | |
| 735 | if (lnum == used_ebs - 1) |
| 736 | /* If this is the last LEB @len may be unaligned */ |
| 737 | len = ALIGN(data_size, ubi->min_io_size); |
| 738 | else |
Kyungmin Park | cadb40c | 2008-05-22 10:32:18 +0900 | [diff] [blame] | 739 | ubi_assert(!(len & (ubi->min_io_size - 1))); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 740 | |
Artem Bityutskiy | 33818bb | 2007-08-28 21:29:32 +0300 | [diff] [blame] | 741 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 742 | if (!vid_hdr) |
| 743 | return -ENOMEM; |
| 744 | |
| 745 | err = leb_write_lock(ubi, vol_id, lnum); |
| 746 | if (err) { |
| 747 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 748 | return err; |
| 749 | } |
| 750 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 751 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
| 752 | vid_hdr->vol_id = cpu_to_be32(vol_id); |
| 753 | vid_hdr->lnum = cpu_to_be32(lnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 754 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 755 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 756 | |
| 757 | crc = crc32(UBI_CRC32_INIT, buf, data_size); |
| 758 | vid_hdr->vol_type = UBI_VID_STATIC; |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 759 | vid_hdr->data_size = cpu_to_be32(data_size); |
| 760 | vid_hdr->used_ebs = cpu_to_be32(used_ebs); |
| 761 | vid_hdr->data_crc = cpu_to_be32(crc); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 762 | |
| 763 | retry: |
| 764 | pnum = ubi_wl_get_peb(ubi, dtype); |
| 765 | if (pnum < 0) { |
| 766 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 767 | leb_write_unlock(ubi, vol_id, lnum); |
| 768 | return pnum; |
| 769 | } |
| 770 | |
| 771 | dbg_eba("write VID hdr and %d bytes at LEB %d:%d, PEB %d, used_ebs %d", |
| 772 | len, vol_id, lnum, pnum, used_ebs); |
| 773 | |
| 774 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); |
| 775 | if (err) { |
| 776 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", |
| 777 | vol_id, lnum, pnum); |
| 778 | goto write_error; |
| 779 | } |
| 780 | |
| 781 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); |
| 782 | if (err) { |
| 783 | ubi_warn("failed to write %d bytes of data to PEB %d", |
| 784 | len, pnum); |
| 785 | goto write_error; |
| 786 | } |
| 787 | |
| 788 | ubi_assert(vol->eba_tbl[lnum] < 0); |
| 789 | vol->eba_tbl[lnum] = pnum; |
| 790 | |
| 791 | leb_write_unlock(ubi, vol_id, lnum); |
| 792 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 793 | return 0; |
| 794 | |
| 795 | write_error: |
| 796 | if (err != -EIO || !ubi->bad_allowed) { |
| 797 | /* |
| 798 | * This flash device does not admit of bad eraseblocks or |
| 799 | * something nasty and unexpected happened. Switch to read-only |
| 800 | * mode just in case. |
| 801 | */ |
| 802 | ubi_ro_mode(ubi); |
| 803 | leb_write_unlock(ubi, vol_id, lnum); |
| 804 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 805 | return err; |
| 806 | } |
| 807 | |
| 808 | err = ubi_wl_put_peb(ubi, pnum, 1); |
| 809 | if (err || ++tries > UBI_IO_RETRIES) { |
| 810 | ubi_ro_mode(ubi); |
| 811 | leb_write_unlock(ubi, vol_id, lnum); |
| 812 | ubi_free_vid_hdr(ubi, vid_hdr); |
| 813 | return err; |
| 814 | } |
| 815 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 816 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 817 | ubi_msg("try another PEB"); |
| 818 | goto retry; |
| 819 | } |
| 820 | |
| 821 | /* |
| 822 | * ubi_eba_atomic_leb_change - change logical eraseblock atomically. |
| 823 | * @ubi: UBI device description object |
Artem Bityutskiy | c63a491 | 2007-12-17 13:21:07 +0200 | [diff] [blame] | 824 | * @vol: volume description object |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 825 | * @lnum: logical eraseblock number |
| 826 | * @buf: data to write |
| 827 | * @len: how many bytes to write |
| 828 | * @dtype: data type |
| 829 | * |
| 830 | * This function changes the contents of a logical eraseblock atomically. @buf |
| 831 | * has to contain new logical eraseblock data, and @len - the length of the |
| 832 | * data, which has to be aligned. This function guarantees that in case of an |
| 833 | * unclean reboot the old contents is preserved. Returns zero in case of |
| 834 | * success and a negative error code in case of failure. |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 835 | * |
| 836 | * UBI reserves one LEB for the "atomic LEB change" operation, so only one |
| 837 | * LEB change may be done at a time. This is ensured by @ubi->alc_mutex. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 838 | */ |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 839 | int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, |
| 840 | int lnum, const void *buf, int len, int dtype) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 841 | { |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 842 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 843 | struct ubi_vid_hdr *vid_hdr; |
| 844 | uint32_t crc; |
| 845 | |
| 846 | if (ubi->ro_mode) |
| 847 | return -EROFS; |
| 848 | |
Artem Bityutskiy | 60c0315 | 2008-01-24 17:56:14 +0200 | [diff] [blame] | 849 | if (len == 0) { |
| 850 | /* |
| 851 | * Special case when data length is zero. In this case the LEB |
| 852 | * has to be unmapped and mapped somewhere else. |
| 853 | */ |
| 854 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
| 855 | if (err) |
| 856 | return err; |
| 857 | return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0, dtype); |
| 858 | } |
| 859 | |
Artem Bityutskiy | 33818bb | 2007-08-28 21:29:32 +0300 | [diff] [blame] | 860 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 861 | if (!vid_hdr) |
| 862 | return -ENOMEM; |
| 863 | |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 864 | mutex_lock(&ubi->alc_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 865 | err = leb_write_lock(ubi, vol_id, lnum); |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 866 | if (err) |
| 867 | goto out_mutex; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 868 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 869 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
| 870 | vid_hdr->vol_id = cpu_to_be32(vol_id); |
| 871 | vid_hdr->lnum = cpu_to_be32(lnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 872 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 873 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 874 | |
| 875 | crc = crc32(UBI_CRC32_INIT, buf, len); |
Artem Bityutskiy | 84a9258 | 2007-07-04 16:16:51 +0300 | [diff] [blame] | 876 | vid_hdr->vol_type = UBI_VID_DYNAMIC; |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 877 | vid_hdr->data_size = cpu_to_be32(len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 878 | vid_hdr->copy_flag = 1; |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 879 | vid_hdr->data_crc = cpu_to_be32(crc); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 880 | |
| 881 | retry: |
| 882 | pnum = ubi_wl_get_peb(ubi, dtype); |
| 883 | if (pnum < 0) { |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 884 | err = pnum; |
| 885 | goto out_leb_unlock; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 886 | } |
| 887 | |
| 888 | dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d", |
| 889 | vol_id, lnum, vol->eba_tbl[lnum], pnum); |
| 890 | |
| 891 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); |
| 892 | if (err) { |
| 893 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", |
| 894 | vol_id, lnum, pnum); |
| 895 | goto write_error; |
| 896 | } |
| 897 | |
| 898 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); |
| 899 | if (err) { |
| 900 | ubi_warn("failed to write %d bytes of data to PEB %d", |
| 901 | len, pnum); |
| 902 | goto write_error; |
| 903 | } |
| 904 | |
Artem Bityutskiy | a443db4 | 2007-05-21 20:26:05 +0300 | [diff] [blame] | 905 | if (vol->eba_tbl[lnum] >= 0) { |
Artem Bityutskiy | 4d88de4 | 2008-07-18 12:42:14 +0300 | [diff] [blame] | 906 | err = ubi_wl_put_peb(ubi, vol->eba_tbl[lnum], 0); |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 907 | if (err) |
| 908 | goto out_leb_unlock; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 909 | } |
| 910 | |
| 911 | vol->eba_tbl[lnum] = pnum; |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 912 | |
| 913 | out_leb_unlock: |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 914 | leb_write_unlock(ubi, vol_id, lnum); |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 915 | out_mutex: |
| 916 | mutex_unlock(&ubi->alc_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 917 | ubi_free_vid_hdr(ubi, vid_hdr); |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 918 | return err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 919 | |
| 920 | write_error: |
| 921 | if (err != -EIO || !ubi->bad_allowed) { |
| 922 | /* |
| 923 | * This flash device does not admit of bad eraseblocks or |
| 924 | * something nasty and unexpected happened. Switch to read-only |
| 925 | * mode just in case. |
| 926 | */ |
| 927 | ubi_ro_mode(ubi); |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 928 | goto out_leb_unlock; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 929 | } |
| 930 | |
| 931 | err = ubi_wl_put_peb(ubi, pnum, 1); |
| 932 | if (err || ++tries > UBI_IO_RETRIES) { |
| 933 | ubi_ro_mode(ubi); |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 934 | goto out_leb_unlock; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 935 | } |
| 936 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 937 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 938 | ubi_msg("try another PEB"); |
| 939 | goto retry; |
| 940 | } |
| 941 | |
| 942 | /** |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 943 | * ubi_eba_copy_leb - copy logical eraseblock. |
| 944 | * @ubi: UBI device description object |
| 945 | * @from: physical eraseblock number from where to copy |
| 946 | * @to: physical eraseblock number where to copy |
| 947 | * @vid_hdr: VID header of the @from physical eraseblock |
| 948 | * |
| 949 | * This function copies logical eraseblock from physical eraseblock @from to |
| 950 | * physical eraseblock @to. The @vid_hdr buffer may be changed by this |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 951 | * function. Returns: |
| 952 | * o %0 in case of success; |
| 953 | * o %1 if the operation was canceled and should be tried later (e.g., |
| 954 | * because a bit-flip was detected at the target PEB); |
| 955 | * o %2 if the volume is being deleted and this LEB should not be moved. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 956 | */ |
| 957 | int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, |
| 958 | struct ubi_vid_hdr *vid_hdr) |
| 959 | { |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 960 | int err, vol_id, lnum, data_size, aldata_size, idx; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 961 | struct ubi_volume *vol; |
| 962 | uint32_t crc; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 963 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 964 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
| 965 | lnum = be32_to_cpu(vid_hdr->lnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 966 | |
| 967 | dbg_eba("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to); |
| 968 | |
| 969 | if (vid_hdr->vol_type == UBI_VID_STATIC) { |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 970 | data_size = be32_to_cpu(vid_hdr->data_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 971 | aldata_size = ALIGN(data_size, ubi->min_io_size); |
| 972 | } else |
| 973 | data_size = aldata_size = |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 974 | ubi->leb_size - be32_to_cpu(vid_hdr->data_pad); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 975 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 976 | idx = vol_id2idx(ubi, vol_id); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 977 | spin_lock(&ubi->volumes_lock); |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 978 | /* |
| 979 | * Note, we may race with volume deletion, which means that the volume |
| 980 | * this logical eraseblock belongs to might be being deleted. Since the |
| 981 | * volume deletion unmaps all the volume's logical eraseblocks, it will |
| 982 | * be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish. |
| 983 | */ |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 984 | vol = ubi->volumes[idx]; |
| 985 | if (!vol) { |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 986 | /* No need to do further work, cancel */ |
| 987 | dbg_eba("volume %d is being removed, cancel", vol_id); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 988 | spin_unlock(&ubi->volumes_lock); |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 989 | return 2; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 990 | } |
| 991 | spin_unlock(&ubi->volumes_lock); |
| 992 | |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 993 | /* |
| 994 | * We do not want anybody to write to this logical eraseblock while we |
| 995 | * are moving it, so lock it. |
| 996 | * |
| 997 | * Note, we are using non-waiting locking here, because we cannot sleep |
| 998 | * on the LEB, since it may cause deadlocks. Indeed, imagine a task is |
| 999 | * unmapping the LEB which is mapped to the PEB we are going to move |
| 1000 | * (@from). This task locks the LEB and goes sleep in the |
| 1001 | * 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are |
| 1002 | * holding @ubi->move_mutex and go sleep on the LEB lock. So, if the |
| 1003 | * LEB is already locked, we just do not move it and return %1. |
| 1004 | */ |
| 1005 | err = leb_write_trylock(ubi, vol_id, lnum); |
| 1006 | if (err) { |
| 1007 | dbg_eba("contention on LEB %d:%d, cancel", vol_id, lnum); |
| 1008 | return err; |
| 1009 | } |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1010 | |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 1011 | /* |
| 1012 | * The LEB might have been put meanwhile, and the task which put it is |
| 1013 | * probably waiting on @ubi->move_mutex. No need to continue the work, |
| 1014 | * cancel it. |
| 1015 | */ |
| 1016 | if (vol->eba_tbl[lnum] != from) { |
| 1017 | dbg_eba("LEB %d:%d is no longer mapped to PEB %d, mapped to " |
| 1018 | "PEB %d, cancel", vol_id, lnum, from, |
| 1019 | vol->eba_tbl[lnum]); |
| 1020 | err = 1; |
| 1021 | goto out_unlock_leb; |
| 1022 | } |
| 1023 | |
| 1024 | /* |
| 1025 | * OK, now the LEB is locked and we can safely start moving iy. Since |
| 1026 | * this function utilizes thie @ubi->peb1_buf buffer which is shared |
| 1027 | * with some other functions, so lock the buffer by taking the |
| 1028 | * @ubi->buf_mutex. |
| 1029 | */ |
| 1030 | mutex_lock(&ubi->buf_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1031 | dbg_eba("read %d bytes of data", aldata_size); |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 1032 | err = ubi_io_read_data(ubi, ubi->peb_buf1, from, 0, aldata_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1033 | if (err && err != UBI_IO_BITFLIPS) { |
| 1034 | ubi_warn("error %d while reading data from PEB %d", |
| 1035 | err, from); |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 1036 | goto out_unlock_buf; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * Now we have got to calculate how much data we have to to copy. In |
| 1041 | * case of a static volume it is fairly easy - the VID header contains |
| 1042 | * the data size. In case of a dynamic volume it is more difficult - we |
| 1043 | * have to read the contents, cut 0xFF bytes from the end and copy only |
| 1044 | * the first part. We must do this to avoid writing 0xFF bytes as it |
| 1045 | * may have some side-effects. And not only this. It is important not |
| 1046 | * to include those 0xFFs to CRC because later the they may be filled |
| 1047 | * by data. |
| 1048 | */ |
| 1049 | if (vid_hdr->vol_type == UBI_VID_DYNAMIC) |
| 1050 | aldata_size = data_size = |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 1051 | ubi_calc_data_len(ubi, ubi->peb_buf1, data_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1052 | |
| 1053 | cond_resched(); |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 1054 | crc = crc32(UBI_CRC32_INIT, ubi->peb_buf1, data_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1055 | cond_resched(); |
| 1056 | |
| 1057 | /* |
| 1058 | * It may turn out to me that the whole @from physical eraseblock |
| 1059 | * contains only 0xFF bytes. Then we have to only write the VID header |
| 1060 | * and do not write any data. This also means we should not set |
| 1061 | * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc. |
| 1062 | */ |
| 1063 | if (data_size > 0) { |
| 1064 | vid_hdr->copy_flag = 1; |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 1065 | vid_hdr->data_size = cpu_to_be32(data_size); |
| 1066 | vid_hdr->data_crc = cpu_to_be32(crc); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1067 | } |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 1068 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1069 | |
| 1070 | err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); |
| 1071 | if (err) |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 1072 | goto out_unlock_buf; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1073 | |
| 1074 | cond_resched(); |
| 1075 | |
| 1076 | /* Read the VID header back and check if it was written correctly */ |
| 1077 | err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1); |
| 1078 | if (err) { |
| 1079 | if (err != UBI_IO_BITFLIPS) |
| 1080 | ubi_warn("cannot read VID header back from PEB %d", to); |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 1081 | else |
| 1082 | err = 1; |
| 1083 | goto out_unlock_buf; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1084 | } |
| 1085 | |
| 1086 | if (data_size > 0) { |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 1087 | err = ubi_io_write_data(ubi, ubi->peb_buf1, to, 0, aldata_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1088 | if (err) |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 1089 | goto out_unlock_buf; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1090 | |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 1091 | cond_resched(); |
| 1092 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1093 | /* |
| 1094 | * We've written the data and are going to read it back to make |
| 1095 | * sure it was written correctly. |
| 1096 | */ |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1097 | |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 1098 | err = ubi_io_read_data(ubi, ubi->peb_buf2, to, 0, aldata_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1099 | if (err) { |
| 1100 | if (err != UBI_IO_BITFLIPS) |
| 1101 | ubi_warn("cannot read data back from PEB %d", |
| 1102 | to); |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 1103 | else |
| 1104 | err = 1; |
| 1105 | goto out_unlock_buf; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1106 | } |
| 1107 | |
| 1108 | cond_resched(); |
| 1109 | |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 1110 | if (memcmp(ubi->peb_buf1, ubi->peb_buf2, aldata_size)) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1111 | ubi_warn("read data back from PEB %d - it is different", |
| 1112 | to); |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 1113 | goto out_unlock_buf; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1114 | } |
| 1115 | } |
| 1116 | |
| 1117 | ubi_assert(vol->eba_tbl[lnum] == from); |
| 1118 | vol->eba_tbl[lnum] = to; |
| 1119 | |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 1120 | out_unlock_buf: |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 1121 | mutex_unlock(&ubi->buf_mutex); |
Artem Bityutskiy | 43f9b25 | 2007-12-18 15:06:55 +0200 | [diff] [blame] | 1122 | out_unlock_leb: |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1123 | leb_write_unlock(ubi, vol_id, lnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1124 | return err; |
| 1125 | } |
| 1126 | |
| 1127 | /** |
Artem Bityutskiy | 85c6e6e | 2008-07-16 10:25:56 +0300 | [diff] [blame] | 1128 | * ubi_eba_init_scan - initialize the EBA sub-system using scanning information. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1129 | * @ubi: UBI device description object |
| 1130 | * @si: scanning information |
| 1131 | * |
| 1132 | * This function returns zero in case of success and a negative error code in |
| 1133 | * case of failure. |
| 1134 | */ |
| 1135 | int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si) |
| 1136 | { |
| 1137 | int i, j, err, num_volumes; |
| 1138 | struct ubi_scan_volume *sv; |
| 1139 | struct ubi_volume *vol; |
| 1140 | struct ubi_scan_leb *seb; |
| 1141 | struct rb_node *rb; |
| 1142 | |
Artem Bityutskiy | 85c6e6e | 2008-07-16 10:25:56 +0300 | [diff] [blame] | 1143 | dbg_eba("initialize EBA sub-system"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1144 | |
| 1145 | spin_lock_init(&ubi->ltree_lock); |
Artem Bityutskiy | e8823bd | 2007-09-13 14:28:14 +0300 | [diff] [blame] | 1146 | mutex_init(&ubi->alc_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1147 | ubi->ltree = RB_ROOT; |
| 1148 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1149 | ubi->global_sqnum = si->max_sqnum + 1; |
| 1150 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; |
| 1151 | |
| 1152 | for (i = 0; i < num_volumes; i++) { |
| 1153 | vol = ubi->volumes[i]; |
| 1154 | if (!vol) |
| 1155 | continue; |
| 1156 | |
| 1157 | cond_resched(); |
| 1158 | |
| 1159 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), |
| 1160 | GFP_KERNEL); |
| 1161 | if (!vol->eba_tbl) { |
| 1162 | err = -ENOMEM; |
| 1163 | goto out_free; |
| 1164 | } |
| 1165 | |
| 1166 | for (j = 0; j < vol->reserved_pebs; j++) |
| 1167 | vol->eba_tbl[j] = UBI_LEB_UNMAPPED; |
| 1168 | |
| 1169 | sv = ubi_scan_find_sv(si, idx2vol_id(ubi, i)); |
| 1170 | if (!sv) |
| 1171 | continue; |
| 1172 | |
| 1173 | ubi_rb_for_each_entry(rb, seb, &sv->root, u.rb) { |
| 1174 | if (seb->lnum >= vol->reserved_pebs) |
| 1175 | /* |
| 1176 | * This may happen in case of an unclean reboot |
| 1177 | * during re-size. |
| 1178 | */ |
| 1179 | ubi_scan_move_to_list(sv, seb, &si->erase); |
| 1180 | vol->eba_tbl[seb->lnum] = seb->pnum; |
| 1181 | } |
| 1182 | } |
| 1183 | |
Artem Bityutskiy | 94780d4 | 2007-12-04 21:36:12 +0200 | [diff] [blame] | 1184 | if (ubi->avail_pebs < EBA_RESERVED_PEBS) { |
| 1185 | ubi_err("no enough physical eraseblocks (%d, need %d)", |
| 1186 | ubi->avail_pebs, EBA_RESERVED_PEBS); |
| 1187 | err = -ENOSPC; |
| 1188 | goto out_free; |
| 1189 | } |
| 1190 | ubi->avail_pebs -= EBA_RESERVED_PEBS; |
| 1191 | ubi->rsvd_pebs += EBA_RESERVED_PEBS; |
| 1192 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1193 | if (ubi->bad_allowed) { |
| 1194 | ubi_calculate_reserved(ubi); |
| 1195 | |
| 1196 | if (ubi->avail_pebs < ubi->beb_rsvd_level) { |
| 1197 | /* No enough free physical eraseblocks */ |
| 1198 | ubi->beb_rsvd_pebs = ubi->avail_pebs; |
| 1199 | ubi_warn("cannot reserve enough PEBs for bad PEB " |
| 1200 | "handling, reserved %d, need %d", |
| 1201 | ubi->beb_rsvd_pebs, ubi->beb_rsvd_level); |
| 1202 | } else |
| 1203 | ubi->beb_rsvd_pebs = ubi->beb_rsvd_level; |
| 1204 | |
| 1205 | ubi->avail_pebs -= ubi->beb_rsvd_pebs; |
| 1206 | ubi->rsvd_pebs += ubi->beb_rsvd_pebs; |
| 1207 | } |
| 1208 | |
Artem Bityutskiy | 85c6e6e | 2008-07-16 10:25:56 +0300 | [diff] [blame] | 1209 | dbg_eba("EBA sub-system is initialized"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1210 | return 0; |
| 1211 | |
| 1212 | out_free: |
| 1213 | for (i = 0; i < num_volumes; i++) { |
| 1214 | if (!ubi->volumes[i]) |
| 1215 | continue; |
| 1216 | kfree(ubi->volumes[i]->eba_tbl); |
| 1217 | } |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1218 | return err; |
| 1219 | } |