drivers/mtd/mtdpart.c

   1 /*
   2  * Simple MTD partitioning layer
   3  *
   4  * Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
   5  * Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
   6  * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/types.h>
  26 #include <linux/kernel.h>
  27 #include <linux/slab.h>
  28 #include <linux/list.h>
  29 #include <linux/kmod.h>
  30 #include <linux/mtd/mtd.h>
  31 #include <linux/mtd/partitions.h>
  32 #include <linux/err.h>
  33
  34 /* Our partition linked list */
  35 static LIST_HEAD(mtd_partitions);
  36 static DEFINE_MUTEX(mtd_partitions_mutex);
  37
  38 /* Our partition node structure */
  39 struct mtd_part {
  40         struct mtd_info mtd;
  41         struct mtd_info *master;
  42         uint64_t offset;
  43         struct list_head list;
  44 };
  45
  46 /*
  47  * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
  48  * the pointer to that structure with this macro.
  49  */
  50 #define PART(x)  ((struct mtd_part *)(x))
  51
  52
  53 /*
  54  * MTD methods which simply translate the effective address and pass through
  55  * to the _real_ device.
  56  */
  57
  58 static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
  59                 size_t *retlen, u_char *buf)
  60 {
  61         struct mtd_part *part = PART(mtd);
  62         struct mtd_ecc_stats stats;
  63         int res;
  64
  65         stats = part->master->ecc_stats;
  66
  67         if (from >= mtd->size)
  68                 len = 0;
  69         else if (from + len > mtd->size)
  70                 len = mtd->size - from;
  71         res = part->master->read(part->master, from + part->offset,
  72                                    len, retlen, buf);
  73         if (unlikely(res)) {
  74                 if (res == -EUCLEAN)
  75                         mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected;
  76                 if (res == -EBADMSG)
  77                         mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed;
  78         }
  79         return res;
  80 }
  81
  82 static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
  83                 size_t *retlen, void **virt, resource_size_t *phys)
  84 {
  85         struct mtd_part *part = PART(mtd);
  86         if (from >= mtd->size)
  87                 len = 0;
  88         else if (from + len > mtd->size)
  89                 len = mtd->size - from;
  90         return part->master->point (part->master, from + part->offset,
  91                                     len, retlen, virt, phys);
  92 }
  93
  94 static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
  95 {
  96         struct mtd_part *part = PART(mtd);
  97
  98         part->master->unpoint(part->master, from + part->offset, len);
  99 }
 100
 101 static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
 102                                             unsigned long len,
 103                                             unsigned long offset,
 104                                             unsigned long flags)
 105 {
 106         struct mtd_part *part = PART(mtd);
 107
 108         offset += part->offset;
 109         return part->master->get_unmapped_area(part->master, len, offset,
 110                                                flags);
 111 }
 112
 113 static int part_read_oob(struct mtd_info *mtd, loff_t from,
 114                 struct mtd_oob_ops *ops)
 115 {
 116         struct mtd_part *part = PART(mtd);
 117         int res;
 118
 119         if (from >= mtd->size)
 120                 return -EINVAL;
 121         if (ops->datbuf && from + ops->len > mtd->size)
 122                 return -EINVAL;
 123         res = part->master->read_oob(part->master, from + part->offset, ops);
 124
 125         if (unlikely(res)) {
 126                 if (res == -EUCLEAN)
 127                         mtd->ecc_stats.corrected++;
 128                 if (res == -EBADMSG)
 129                         mtd->ecc_stats.failed++;
 130         }
 131         return res;
 132 }
 133
 134 static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
 135                 size_t len, size_t *retlen, u_char *buf)
 136 {
 137         struct mtd_part *part = PART(mtd);
 138         return part->master->read_user_prot_reg(part->master, from,
 139                                         len, retlen, buf);
 140 }
 141
 142 static int part_get_user_prot_info(struct mtd_info *mtd,
 143                 struct otp_info *buf, size_t len)
 144 {
 145         struct mtd_part *part = PART(mtd);
 146         return part->master->get_user_prot_info(part->master, buf, len);
 147 }
 148
 149 static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
 150                 size_t len, size_t *retlen, u_char *buf)
 151 {
 152         struct mtd_part *part = PART(mtd);
 153         return part->master->read_fact_prot_reg(part->master, from,
 154                                         len, retlen, buf);
 155 }
 156
 157 static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
 158                 size_t len)
 159 {
 160         struct mtd_part *part = PART(mtd);
 161         return part->master->get_fact_prot_info(part->master, buf, len);
 162 }
 163
 164 static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
 165                 size_t *retlen, const u_char *buf)
 166 {
 167         struct mtd_part *part = PART(mtd);
 168         if (!(mtd->flags & MTD_WRITEABLE))
 169                 return -EROFS;
 170         if (to >= mtd->size)
 171                 len = 0;
 172         else if (to + len > mtd->size)
 173                 len = mtd->size - to;
 174         return part->master->write(part->master, to + part->offset,
 175                                     len, retlen, buf);
 176 }
 177
 178 static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
 179                 size_t *retlen, const u_char *buf)
 180 {
 181         struct mtd_part *part = PART(mtd);
 182         if (!(mtd->flags & MTD_WRITEABLE))
 183                 return -EROFS;
 184         if (to >= mtd->size)
 185                 len = 0;
 186         else if (to + len > mtd->size)
 187                 len = mtd->size - to;
 188         return part->master->panic_write(part->master, to + part->offset,
 189                                     len, retlen, buf);
 190 }
 191
 192 static int part_write_oob(struct mtd_info *mtd, loff_t to,
 193                 struct mtd_oob_ops *ops)
 194 {
 195         struct mtd_part *part = PART(mtd);
 196
 197         if (!(mtd->flags & MTD_WRITEABLE))
 198                 return -EROFS;
 199
 200         if (to >= mtd->size)
 201                 return -EINVAL;
 202         if (ops->datbuf && to + ops->len > mtd->size)
 203                 return -EINVAL;
 204         return part->master->write_oob(part->master, to + part->offset, ops);
 205 }
 206
 207 static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
 208                 size_t len, size_t *retlen, u_char *buf)
 209 {
 210         struct mtd_part *part = PART(mtd);
 211         return part->master->write_user_prot_reg(part->master, from,
 212                                         len, retlen, buf);
 213 }
 214
 215 static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
 216                 size_t len)
 217 {
 218         struct mtd_part *part = PART(mtd);
 219         return part->master->lock_user_prot_reg(part->master, from, len);
 220 }
 221
 222 static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
 223                 unsigned long count, loff_t to, size_t *retlen)
 224 {
 225         struct mtd_part *part = PART(mtd);
 226         if (!(mtd->flags & MTD_WRITEABLE))
 227                 return -EROFS;
 228         return part->master->writev(part->master, vecs, count,
 229                                         to + part->offset, retlen);
 230 }
 231
 232 static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
 233 {
 234         struct mtd_part *part = PART(mtd);
 235         int ret;
 236         if (!(mtd->flags & MTD_WRITEABLE))
 237                 return -EROFS;
 238         if (instr->addr >= mtd->size)
 239                 return -EINVAL;
 240         instr->addr += part->offset;
 241         ret = part->master->erase(part->master, instr);
 242         if (ret) {
 243                 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
 244                         instr->fail_addr -= part->offset;
 245                 instr->addr -= part->offset;
 246         }
 247         return ret;
 248 }
 249
 250 void mtd_erase_callback(struct erase_info *instr)
 251 {
 252         if (instr->mtd->erase == part_erase) {
 253                 struct mtd_part *part = PART(instr->mtd);
 254
 255                 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
 256                         instr->fail_addr -= part->offset;
 257                 instr->addr -= part->offset;
 258         }
 259         if (instr->callback)
 260                 instr->callback(instr);
 261 }
 262 EXPORT_SYMBOL_GPL(mtd_erase_callback);
 263
 264 static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 265 {
 266         struct mtd_part *part = PART(mtd);
 267         if ((len + ofs) > mtd->size)
 268                 return -EINVAL;
 269         return part->master->lock(part->master, ofs + part->offset, len);
 270 }
 271
 272 static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 273 {
 274         struct mtd_part *part = PART(mtd);
 275         if ((len + ofs) > mtd->size)
 276                 return -EINVAL;
 277         return part->master->unlock(part->master, ofs + part->offset, len);
 278 }
 279
 280 static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 281 {
 282         struct mtd_part *part = PART(mtd);
 283         if ((len + ofs) > mtd->size)
 284                 return -EINVAL;
 285         return part->master->is_locked(part->master, ofs + part->offset, len);
 286 }
 287
 288 static void part_sync(struct mtd_info *mtd)
 289 {
 290         struct mtd_part *part = PART(mtd);
 291         part->master->sync(part->master);
 292 }
 293
 294 static int part_suspend(struct mtd_info *mtd)
 295 {
 296         struct mtd_part *part = PART(mtd);
 297         return part->master->suspend(part->master);
 298 }
 299
 300 static void part_resume(struct mtd_info *mtd)
 301 {
 302         struct mtd_part *part = PART(mtd);
 303         part->master->resume(part->master);
 304 }
 305
 306 static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
 307 {
 308         struct mtd_part *part = PART(mtd);
 309         if (ofs >= mtd->size)
 310                 return -EINVAL;
 311         ofs += part->offset;
 312         return part->master->block_isbad(part->master, ofs);
 313 }
 314
 315 static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
 316 {
 317         struct mtd_part *part = PART(mtd);
 318         int res;
 319
 320         if (!(mtd->flags & MTD_WRITEABLE))
 321                 return -EROFS;
 322         if (ofs >= mtd->size)
 323                 return -EINVAL;
 324         ofs += part->offset;
 325         res = part->master->block_markbad(part->master, ofs);
 326         if (!res)
 327                 mtd->ecc_stats.badblocks++;
 328         return res;
 329 }
 330
 331 static inline void free_partition(struct mtd_part *p)
 332 {
 333         kfree(p->mtd.name);
 334         kfree(p);
 335 }
 336
 337 /*
 338  * This function unregisters and destroy all slave MTD objects which are
 339  * attached to the given master MTD object.
 340  */
 341
 342 int del_mtd_partitions(struct mtd_info *master)
 343 {
 344         struct mtd_part *slave, *next;
 345         int ret, err = 0;
 346
 347         mutex_lock(&mtd_partitions_mutex);
 348         list_for_each_entry_safe(slave, next, &mtd_partitions, list)
 349                 if (slave->master == master) {
 350                         ret = del_mtd_device(&slave->mtd);
 351                         if (ret < 0) {
 352                                 err = ret;
 353                                 continue;
 354                         }
 355                         list_del(&slave->list);
 356                         free_partition(slave);
 357                 }
 358         mutex_unlock(&mtd_partitions_mutex);
 359
 360         return err;
 361 }
 362 EXPORT_SYMBOL(del_mtd_partitions);
 363
 364 static struct mtd_part *allocate_partition(struct mtd_info *master,
 365                         const struct mtd_partition *part, int partno,
 366                         uint64_t cur_offset)
 367 {
 368         struct mtd_part *slave;
 369         char *name;
 370
 371         /* allocate the partition structure */
 372         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
 373         name = kstrdup(part->name, GFP_KERNEL);
 374         if (!name || !slave) {
 375                 printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
 376                        master->name);
 377                 kfree(name);
 378                 kfree(slave);
 379                 return ERR_PTR(-ENOMEM);
 380         }
 381
 382         /* set up the MTD object for this partition */
 383         slave->mtd.type = master->type;
 384         slave->mtd.flags = master->flags & ~part->mask_flags;
 385         slave->mtd.size = part->size;
 386         slave->mtd.writesize = master->writesize;
 387         slave->mtd.oobsize = master->oobsize;
 388         slave->mtd.oobavail = master->oobavail;
 389         slave->mtd.subpage_sft = master->subpage_sft;
 390
 391         slave->mtd.name = name;
 392         slave->mtd.owner = master->owner;
 393         slave->mtd.backing_dev_info = master->backing_dev_info;
 394
 395         /* NOTE:  we don't arrange MTDs as a tree; it'd be error-prone
 396          * to have the same data be in two different partitions.
 397          */
 398         slave->mtd.dev.parent = master->dev.parent;
 399
 400         slave->mtd.read = part_read;
 401         slave->mtd.write = part_write;
 402
 403         if (master->panic_write)
 404                 slave->mtd.panic_write = part_panic_write;
 405
 406         if (master->point && master->unpoint) {
 407                 slave->mtd.point = part_point;
 408                 slave->mtd.unpoint = part_unpoint;
 409         }
 410
 411         if (master->get_unmapped_area)
 412                 slave->mtd.get_unmapped_area = part_get_unmapped_area;
 413         if (master->read_oob)
 414                 slave->mtd.read_oob = part_read_oob;
 415         if (master->write_oob)
 416                 slave->mtd.write_oob = part_write_oob;
 417         if (master->read_user_prot_reg)
 418                 slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
 419         if (master->read_fact_prot_reg)
 420                 slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
 421         if (master->write_user_prot_reg)
 422                 slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
 423         if (master->lock_user_prot_reg)
 424                 slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
 425         if (master->get_user_prot_info)
 426                 slave->mtd.get_user_prot_info = part_get_user_prot_info;
 427         if (master->get_fact_prot_info)
 428                 slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
 429         if (master->sync)
 430                 slave->mtd.sync = part_sync;
 431         if (!partno && !master->dev.class && master->suspend && master->resume) {
 432                         slave->mtd.suspend = part_suspend;
 433                         slave->mtd.resume = part_resume;
 434         }
 435         if (master->writev)
 436                 slave->mtd.writev = part_writev;
 437         if (master->lock)
 438                 slave->mtd.lock = part_lock;
 439         if (master->unlock)
 440                 slave->mtd.unlock = part_unlock;
 441         if (master->is_locked)
 442                 slave->mtd.is_locked = part_is_locked;
 443         if (master->block_isbad)
 444                 slave->mtd.block_isbad = part_block_isbad;
 445         if (master->block_markbad)
 446                 slave->mtd.block_markbad = part_block_markbad;
 447         slave->mtd.erase = part_erase;
 448         slave->master = master;
 449         slave->offset = part->offset;
 450
 451         if (slave->offset == MTDPART_OFS_APPEND)
 452                 slave->offset = cur_offset;
 453         if (slave->offset == MTDPART_OFS_NXTBLK) {
 454                 slave->offset = cur_offset;
 455                 if (mtd_mod_by_eb(cur_offset, master) != 0) {
 456                         /* Round up to next erasesize */
 457                         slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
 458                         printk(KERN_NOTICE "Moving partition %d: "
 459                                "0x%012llx -> 0x%012llx\n", partno,
 460                                (unsigned long long)cur_offset, (unsigned long long)slave->offset);
 461                 }
 462         }
 463         if (slave->mtd.size == MTDPART_SIZ_FULL)
 464                 slave->mtd.size = master->size - slave->offset;
 465
 466         printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
 467                 (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
 468
 469         /* let's do some sanity checks */
 470         if (slave->offset >= master->size) {
 471                 /* let's register it anyway to preserve ordering */
 472                 slave->offset = 0;
 473                 slave->mtd.size = 0;
 474                 printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
 475                         part->name);
 476                 goto out_register;
 477         }
 478         if (slave->offset + slave->mtd.size > master->size) {
 479                 slave->mtd.size = master->size - slave->offset;
 480                 printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
 481                         part->name, master->name, (unsigned long long)slave->mtd.size);
 482         }
 483         if (master->numeraseregions > 1) {
 484                 /* Deal with variable erase size stuff */
 485                 int i, max = master->numeraseregions;
 486                 u64 end = slave->offset + slave->mtd.size;
 487                 struct mtd_erase_region_info *regions = master->eraseregions;
 488
 489                 /* Find the first erase regions which is part of this
 490                  * partition. */
 491                 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
 492                         ;
 493                 /* The loop searched for the region _behind_ the first one */
 494                 if (i > 0)
 495                         i--;
 496
 497                 /* Pick biggest erasesize */
 498                 for (; i < max && regions[i].offset < end; i++) {
 499                         if (slave->mtd.erasesize < regions[i].erasesize) {
 500                                 slave->mtd.erasesize = regions[i].erasesize;
 501                         }
 502                 }
 503                 BUG_ON(slave->mtd.erasesize == 0);
 504         } else {
 505                 /* Single erase size */
 506                 slave->mtd.erasesize = master->erasesize;
 507         }
 508
 509         if ((slave->mtd.flags & MTD_WRITEABLE) &&
 510             mtd_mod_by_eb(slave->offset, &slave->mtd)) {
 511                 /* Doesn't start on a boundary of major erase size */
 512                 /* FIXME: Let it be writable if it is on a boundary of
 513                  * _minor_ erase size though */
 514                 slave->mtd.flags &= ~MTD_WRITEABLE;
 515                 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 516                         part->name);
 517         }
 518         if ((slave->mtd.flags & MTD_WRITEABLE) &&
 519             mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
 520                 slave->mtd.flags &= ~MTD_WRITEABLE;
 521                 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 522                         part->name);
 523         }
 524
 525         slave->mtd.ecclayout = master->ecclayout;
 526         if (master->block_isbad) {
 527                 uint64_t offs = 0;
 528
 529                 while (offs < slave->mtd.size) {
 530                         if (master->block_isbad(master,
 531                                                 offs + slave->offset))
 532                                 slave->mtd.ecc_stats.badblocks++;
 533                         offs += slave->mtd.erasesize;
 534                 }
 535         }
 536
 537 out_register:
 538         return slave;
 539 }
 540
 541 int mtd_add_partition(struct mtd_info *master, char *name,
 542                       long long offset, long long length)
 543 {
 544         struct mtd_partition part;
 545         struct mtd_part *p, *new;
 546         uint64_t start, end;
 547         int ret = 0;
 548
 549         /* the direct offset is expected */
 550         if (offset == MTDPART_OFS_APPEND ||
 551             offset == MTDPART_OFS_NXTBLK)
 552                 return -EINVAL;
 553
 554         if (length == MTDPART_SIZ_FULL)
 555                 length = master->size - offset;
 556
 557         if (length <= 0)
 558                 return -EINVAL;
 559
 560         part.name = name;
 561         part.size = length;
 562         part.offset = offset;
 563         part.mask_flags = 0;
 564         part.ecclayout = NULL;
 565
 566         new = allocate_partition(master, &part, -1, offset);
 567         if (IS_ERR(new))
 568                 return PTR_ERR(new);
 569
 570         start = offset;
 571         end = offset + length;
 572
 573         mutex_lock(&mtd_partitions_mutex);
 574         list_for_each_entry(p, &mtd_partitions, list)
 575                 if (p->master == master) {
 576                         if ((start >= p->offset) &&
 577                             (start < (p->offset + p->mtd.size)))
 578                                 goto err_inv;
 579
 580                         if ((end >= p->offset) &&
 581                             (end < (p->offset + p->mtd.size)))
 582                                 goto err_inv;
 583                 }
 584
 585         list_add(&new->list, &mtd_partitions);
 586         mutex_unlock(&mtd_partitions_mutex);
 587
 588         add_mtd_device(&new->mtd);
 589
 590         return ret;
 591 err_inv:
 592         mutex_unlock(&mtd_partitions_mutex);
 593         free_partition(new);
 594         return -EINVAL;
 595 }
 596 EXPORT_SYMBOL_GPL(mtd_add_partition);
 597
 598 int mtd_del_partition(struct mtd_info *master, int partno)
 599 {
 600         struct mtd_part *slave, *next;
 601         int ret = -EINVAL;
 602
 603         mutex_lock(&mtd_partitions_mutex);
 604         list_for_each_entry_safe(slave, next, &mtd_partitions, list)
 605                 if ((slave->master == master) &&
 606                     (slave->mtd.index == partno)) {
 607                         ret = del_mtd_device(&slave->mtd);
 608                         if (ret < 0)
 609                                 break;
 610
 611                         list_del(&slave->list);
 612                         free_partition(slave);
 613                         break;
 614                 }
 615         mutex_unlock(&mtd_partitions_mutex);
 616
 617         return ret;
 618 }
 619 EXPORT_SYMBOL_GPL(mtd_del_partition);
 620
 621 /*
 622  * This function, given a master MTD object and a partition table, creates
 623  * and registers slave MTD objects which are bound to the master according to
 624  * the partition definitions.
 625  *
 626  * We don't register the master, or expect the caller to have done so,
 627  * for reasons of data integrity.
 628  */
 629
 630 int add_mtd_partitions(struct mtd_info *master,
 631                        const struct mtd_partition *parts,
 632                        int nbparts)
 633 {
 634         struct mtd_part *slave;
 635         uint64_t cur_offset = 0;
 636         int i;
 637
 638         printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 639
 640         for (i = 0; i < nbparts; i++) {
 641                 slave = allocate_partition(master, parts + i, i, cur_offset);
 642                 if (IS_ERR(slave))
 643                         return PTR_ERR(slave);
 644
 645                 mutex_lock(&mtd_partitions_mutex);
 646                 list_add(&slave->list, &mtd_partitions);
 647                 mutex_unlock(&mtd_partitions_mutex);
 648
 649                 add_mtd_device(&slave->mtd);
 650
 651                 cur_offset = slave->offset + slave->mtd.size;
 652         }
 653
 654         return 0;
 655 }
 656 EXPORT_SYMBOL(add_mtd_partitions);
 657
 658 static DEFINE_SPINLOCK(part_parser_lock);
 659 static LIST_HEAD(part_parsers);
 660
 661 static struct mtd_part_parser *get_partition_parser(const char *name)
 662 {
 663         struct mtd_part_parser *p, *ret = NULL;
 664
 665         spin_lock(&part_parser_lock);
 666
 667         list_for_each_entry(p, &part_parsers, list)
 668                 if (!strcmp(p->name, name) && try_module_get(p->owner)) {
 669                         ret = p;
 670                         break;
 671                 }
 672
 673         spin_unlock(&part_parser_lock);
 674
 675         return ret;
 676 }
 677
 678 int register_mtd_parser(struct mtd_part_parser *p)
 679 {
 680         spin_lock(&part_parser_lock);
 681         list_add(&p->list, &part_parsers);
 682         spin_unlock(&part_parser_lock);
 683
 684         return 0;
 685 }
 686 EXPORT_SYMBOL_GPL(register_mtd_parser);
 687
 688 int deregister_mtd_parser(struct mtd_part_parser *p)
 689 {
 690         spin_lock(&part_parser_lock);
 691         list_del(&p->list);
 692         spin_unlock(&part_parser_lock);
 693         return 0;
 694 }
 695 EXPORT_SYMBOL_GPL(deregister_mtd_parser);
 696
 697 int parse_mtd_partitions(struct mtd_info *master, const char **types,
 698                          struct mtd_partition **pparts, unsigned long origin)
 699 {
 700         struct mtd_part_parser *parser;
 701         int ret = 0;
 702
 703         for ( ; ret <= 0 && *types; types++) {
 704                 parser = get_partition_parser(*types);
 705                 if (!parser && !request_module("%s", *types))
 706                                 parser = get_partition_parser(*types);
 707                 if (!parser) {
 708                         printk(KERN_NOTICE "%s partition parsing not available\n",
 709                                *types);
 710                         continue;
 711                 }
 712                 ret = (*parser->parse_fn)(master, pparts, origin);
 713                 if (ret > 0) {
 714                         printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
 715                                ret, parser->name, master->name);
 716                 }
 717                 put_partition_parser(parser);
 718         }
 719         return ret;
 720 }
 721 EXPORT_SYMBOL_GPL(parse_mtd_partitions);
 722
 723 int mtd_is_master(struct mtd_info *mtd)
 724 {
 725         struct mtd_part *part;
 726         int nopart = 0;
 727
 728         mutex_lock(&mtd_partitions_mutex);
 729         list_for_each_entry(part, &mtd_partitions, list)
 730                 if (&part->mtd == mtd) {
 731                         nopart = 1;
 732                         break;
 733                 }
 734         mutex_unlock(&mtd_partitions_mutex);
 735
 736         return nopart;
 737 }
 738 EXPORT_SYMBOL_GPL(mtd_is_master);