target/linux/generic-2.6/patches-2.6.24/065-rootfs_split.patch

   1 --- a/drivers/mtd/Kconfig
   2 +++ b/drivers/mtd/Kconfig
   3 @@ -47,6 +47,16 @@ config MTD_PARTITIONS
   4           devices. Partitioning on NFTL 'devices' is a different - that's the
   5           'normal' form of partitioning used on a block device.
   6
   7 +config MTD_ROOTFS_ROOT_DEV
   8 +       bool "Automatically set 'rootfs' partition to be root filesystem"
   9 +       depends on MTD_PARTITIONS
  10 +       default y
  11 +
  12 +config MTD_ROOTFS_SPLIT
  13 +       bool "Automatically split 'rootfs' partition for squashfs"
  14 +       depends on MTD_PARTITIONS
  15 +       default y
  16 +
  17  config MTD_REDBOOT_PARTS
  18         tristate "RedBoot partition table parsing"
  19         depends on MTD_PARTITIONS
  20 --- a/drivers/mtd/mtdpart.c
  21 +++ b/drivers/mtd/mtdpart.c
  22 @@ -20,6 +20,8 @@
  23  #include <linux/mtd/mtd.h>
  24  #include <linux/mtd/partitions.h>
  25  #include <linux/mtd/compatmac.h>
  26 +#include <linux/squashfs_fs.h>
  27 +#include <linux/root_dev.h>
  28
  29  /* Our partition linked list */
  30  static LIST_HEAD(mtd_partitions);
  31 @@ -39,7 +41,7 @@ struct mtd_part {
  32   * the pointer to that structure with this macro.
  33   */
  34  #define PART(x)  ((struct mtd_part *)(x))
  35 -
  36 +#define IS_PART(mtd) (mtd->read == part_read)
  37
  38  /*
  39   * MTD methods which simply translate the effective address and pass through
  40 @@ -308,6 +310,312 @@ int del_mtd_partitions(struct mtd_info *
  41         return 0;
  42  }
  43
  44 +static u_int32_t cur_offset = 0;
  45 +static int add_one_partition(struct mtd_info *master, const struct mtd_partition *part,
  46 +               int i, struct mtd_part **slp)
  47 +{
  48 +       struct mtd_part *slave;
  49 +
  50 +       /* allocate the partition structure */
  51 +       slave = kzalloc (sizeof(*slave), GFP_KERNEL);
  52 +       if (!slave) {
  53 +               printk ("memory allocation error while creating partitions for \"%s\"\n",
  54 +                       master->name);
  55 +               del_mtd_partitions(master);
  56 +               return -ENOMEM;
  57 +       }
  58 +       list_add(&slave->list, &mtd_partitions);
  59 +
  60 +       /* set up the MTD object for this partition */
  61 +       slave->mtd.type = master->type;
  62 +       slave->mtd.flags = master->flags & ~part->mask_flags;
  63 +       slave->mtd.size = part->size;
  64 +       slave->mtd.writesize = master->writesize;
  65 +       slave->mtd.oobsize = master->oobsize;
  66 +       slave->mtd.oobavail = master->oobavail;
  67 +       slave->mtd.subpage_sft = master->subpage_sft;
  68 +
  69 +       slave->mtd.name = part->name;
  70 +       slave->mtd.owner = master->owner;
  71 +
  72 +       slave->mtd.read = part_read;
  73 +       slave->mtd.write = part_write;
  74 +       slave->mtd.refresh_device = part->refresh_partition;
  75 +
  76 +       if(master->point && master->unpoint){
  77 +               slave->mtd.point = part_point;
  78 +               slave->mtd.unpoint = part_unpoint;
  79 +       }
  80 +
  81 +       if (master->read_oob)
  82 +               slave->mtd.read_oob = part_read_oob;
  83 +       if (master->write_oob)
  84 +               slave->mtd.write_oob = part_write_oob;
  85 +       if(master->read_user_prot_reg)
  86 +               slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
  87 +       if(master->read_fact_prot_reg)
  88 +               slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
  89 +       if(master->write_user_prot_reg)
  90 +               slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
  91 +       if(master->lock_user_prot_reg)
  92 +               slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
  93 +       if(master->get_user_prot_info)
  94 +               slave->mtd.get_user_prot_info = part_get_user_prot_info;
  95 +       if(master->get_fact_prot_info)
  96 +               slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
  97 +       if (master->sync)
  98 +               slave->mtd.sync = part_sync;
  99 +       if (!i && master->suspend && master->resume) {
 100 +                       slave->mtd.suspend = part_suspend;
 101 +                       slave->mtd.resume = part_resume;
 102 +       }
 103 +       if (master->writev)
 104 +               slave->mtd.writev = part_writev;
 105 +       if (master->lock)
 106 +               slave->mtd.lock = part_lock;
 107 +       if (master->unlock)
 108 +               slave->mtd.unlock = part_unlock;
 109 +       if (master->block_isbad)
 110 +               slave->mtd.block_isbad = part_block_isbad;
 111 +       if (master->block_markbad)
 112 +               slave->mtd.block_markbad = part_block_markbad;
 113 +       slave->mtd.erase = part_erase;
 114 +       slave->master = master;
 115 +       slave->offset = part->offset;
 116 +       slave->index = i;
 117 +
 118 +       if (slave->offset == MTDPART_OFS_APPEND)
 119 +               slave->offset = cur_offset;
 120 +       if (slave->offset == MTDPART_OFS_NXTBLK) {
 121 +               slave->offset = cur_offset;
 122 +               if ((cur_offset % master->erasesize) != 0) {
 123 +                       /* Round up to next erasesize */
 124 +                       slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
 125 +                       printk(KERN_NOTICE "Moving partition %d: "
 126 +                              "0x%08x -> 0x%08x\n", i,
 127 +                              cur_offset, slave->offset);
 128 +               }
 129 +       }
 130 +       if (slave->mtd.size == MTDPART_SIZ_FULL)
 131 +               slave->mtd.size = master->size - slave->offset;
 132 +       cur_offset = slave->offset + slave->mtd.size;
 133 +
 134 +       printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
 135 +               slave->offset + slave->mtd.size, slave->mtd.name);
 136 +
 137 +       /* let's do some sanity checks */
 138 +       if (slave->offset >= master->size) {
 139 +                       /* let's register it anyway to preserve ordering */
 140 +               slave->offset = 0;
 141 +               slave->mtd.size = 0;
 142 +               printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
 143 +                       part->name);
 144 +       }
 145 +       if (slave->offset + slave->mtd.size > master->size) {
 146 +               slave->mtd.size = master->size - slave->offset;
 147 +               printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
 148 +                       part->name, master->name, slave->mtd.size);
 149 +       }
 150 +       if (master->numeraseregions>1) {
 151 +               /* Deal with variable erase size stuff */
 152 +               int i;
 153 +               struct mtd_erase_region_info *regions = master->eraseregions;
 154 +
 155 +               /* Find the first erase regions which is part of this partition. */
 156 +               for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
 157 +                       ;
 158 +
 159 +               for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
 160 +                       if (slave->mtd.erasesize < regions[i].erasesize) {
 161 +                               slave->mtd.erasesize = regions[i].erasesize;
 162 +                       }
 163 +               }
 164 +       } else {
 165 +               /* Single erase size */
 166 +               slave->mtd.erasesize = master->erasesize;
 167 +       }
 168 +
 169 +       if ((slave->mtd.flags & MTD_WRITEABLE) &&
 170 +           (slave->offset % slave->mtd.erasesize)) {
 171 +               /* Doesn't start on a boundary of major erase size */
 172 +               /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
 173 +               slave->mtd.flags &= ~MTD_WRITEABLE;
 174 +               printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 175 +                       part->name);
 176 +       }
 177 +       if ((slave->mtd.flags & MTD_WRITEABLE) &&
 178 +           (slave->mtd.size % slave->mtd.erasesize)) {
 179 +               slave->mtd.flags &= ~MTD_WRITEABLE;
 180 +               printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 181 +                       part->name);
 182 +       }
 183 +
 184 +       slave->mtd.ecclayout = master->ecclayout;
 185 +       if (master->block_isbad) {
 186 +               uint32_t offs = 0;
 187 +
 188 +               while(offs < slave->mtd.size) {
 189 +                       if (master->block_isbad(master,
 190 +                                               offs + slave->offset))
 191 +                               slave->mtd.ecc_stats.badblocks++;
 192 +                       offs += slave->mtd.erasesize;
 193 +               }
 194 +       }
 195 +
 196 +       if(part->mtdp)
 197 +       {       /* store the object pointer (caller may or may not register it */
 198 +               *part->mtdp = &slave->mtd;
 199 +               slave->registered = 0;
 200 +       }
 201 +       else
 202 +       {
 203 +               /* register our partition */
 204 +               add_mtd_device(&slave->mtd);
 205 +               slave->registered = 1;
 206 +       }
 207 +
 208 +       if (slp)
 209 +               *slp = slave;
 210 +
 211 +       return 0;
 212 +}
 213 +
 214 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 215 +#define ROOTFS_SPLIT_NAME "rootfs_data"
 216 +#define ROOTFS_REMOVED_NAME "<removed>"
 217 +static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
 218 +{
 219 +       char buf[512];
 220 +       struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 221 +       int len, ret;
 222 +
 223 +       ret = master->read(master, offset, sizeof(*sb), &len, buf);
 224 +       if (ret || (len != sizeof(*sb))) {
 225 +               printk(KERN_ALERT "split_squashfs: error occured while reading "
 226 +                       "from \"%s\"\n", master->name);
 227 +               return -EINVAL;
 228 +       }
 229 +
 230 +       if (*((u32 *) buf) != SQUASHFS_MAGIC) {
 231 +               printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
 232 +                       master->name);
 233 +               *split_offset = 0;
 234 +               return 0;
 235 +       }
 236 +
 237 +       if (sb->bytes_used <= 0) {
 238 +               printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
 239 +                       master->name);
 240 +               *split_offset = 0;
 241 +               return 0;
 242 +       }
 243 +
 244 +       len = (u32) sb->bytes_used;
 245 +       len += (offset & 0x000fffff);
 246 +       len +=  (master->erasesize - 1);
 247 +       len &= ~(master->erasesize - 1);
 248 +       len -= (offset & 0x000fffff);
 249 +       *split_offset = offset + len;
 250 +
 251 +       return 0;
 252 +}
 253 +
 254 +static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, struct mtd_partition *part,
 255 +               int index)
 256 +{
 257 +       struct mtd_partition *dpart;
 258 +       struct mtd_part *slave = NULL;
 259 +       int split_offset = 0;
 260 +       int ret;
 261 +
 262 +       ret = split_squashfs(master, part->offset, &split_offset);
 263 +       if (ret)
 264 +               return ret;
 265 +
 266 +       if (split_offset <= 0)
 267 +               return 0;
 268 +
 269 +       dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
 270 +       if (dpart == NULL) {
 271 +               printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
 272 +                       ROOTFS_SPLIT_NAME);
 273 +               return -ENOMEM;
 274 +       }
 275 +
 276 +       memcpy(dpart, part, sizeof(*part));
 277 +       dpart->name = (unsigned char *)&dpart[1];
 278 +       strcpy(dpart->name, ROOTFS_SPLIT_NAME);
 279 +
 280 +       dpart->size -= split_offset - dpart->offset;
 281 +       dpart->offset = split_offset;
 282 +
 283 +       if (dpart == NULL)
 284 +               return 1;
 285 +
 286 +       printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%X, len=%X \n",
 287 +               ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
 288 +
 289 +       ret = add_one_partition(master, dpart, index, &slave);
 290 +       if (ret)
 291 +               kfree(dpart);
 292 +       else if (slave)
 293 +               rpart->split = &slave->mtd;
 294 +
 295 +       return ret;
 296 +}
 297 +
 298 +static int refresh_rootfs_split(struct mtd_info *mtd)
 299 +{
 300 +       struct mtd_partition tpart;
 301 +       struct mtd_part *part;
 302 +       int index = 0;
 303 +       int offset, size;
 304 +       int ret;
 305 +
 306 +       part = PART(mtd);
 307 +
 308 +       /* check for the new squashfs offset first */
 309 +       ret = split_squashfs(part->master, part->offset, &offset);
 310 +       if (ret)
 311 +               return ret;
 312 +
 313 +       if ((offset > 0) && !mtd->split) {
 314 +               printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
 315 +               /* if we don't have a rootfs split partition, create a new one */
 316 +               tpart.name = mtd->name;
 317 +               tpart.size = mtd->size;
 318 +               tpart.offset = part->offset;
 319 +
 320 +               /* find the index of the last partition */
 321 +               if (!list_empty(&mtd_partitions))
 322 +                       index = list_first_entry(&mtd_partitions, struct mtd_part, list)->index + 1;
 323 +
 324 +               return split_rootfs_data(part->master, &part->mtd, &tpart, index);
 325 +       } else if ((offset > 0) && mtd->split) {
 326 +               /* update the offsets of the existing partition */
 327 +               size = mtd->size + part->offset - offset;
 328 +
 329 +               part = PART(mtd->split);
 330 +               part->offset = offset;
 331 +               part->mtd.size = size;
 332 +               printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
 333 +                       __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
 334 +                       part->offset, part->mtd.size);
 335 +               strcpy(part->mtd.name, ROOTFS_SPLIT_NAME);
 336 +       } else if ((offset <= 0) && mtd->split) {
 337 +               printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
 338 +
 339 +               /* mark existing partition as removed */
 340 +               part = PART(mtd->split);
 341 +               strcpy(part->mtd.name, ROOTFS_REMOVED_NAME);
 342 +               part->offset = 0;
 343 +               part->mtd.size = 0;
 344 +       }
 345 +
 346 +       return 0;
 347 +}
 348 +#endif /* CONFIG_MTD_ROOTFS_SPLIT */
 349 +
 350  /*
 351   * This function, given a master MTD object and a partition table, creates
 352   * and registers slave MTD objects which are bound to the master according to
 353 @@ -320,168 +628,31 @@ int add_mtd_partitions(struct mtd_info *
 354                        int nbparts)
 355  {
 356         struct mtd_part *slave;
 357 -       u_int32_t cur_offset = 0;
 358 -       int i;
 359 +       struct mtd_partition *part;
 360 +       int i, j, ret = 0;
 361
 362         printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 363
 364 -       for (i = 0; i < nbparts; i++) {
 365 -
 366 -               /* allocate the partition structure */
 367 -               slave = kzalloc (sizeof(*slave), GFP_KERNEL);
 368 -               if (!slave) {
 369 -                       printk ("memory allocation error while creating partitions for \"%s\"\n",
 370 -                               master->name);
 371 -                       del_mtd_partitions(master);
 372 -                       return -ENOMEM;
 373 -               }
 374 -               list_add(&slave->list, &mtd_partitions);
 375 -
 376 -               /* set up the MTD object for this partition */
 377 -               slave->mtd.type = master->type;
 378 -               slave->mtd.flags = master->flags & ~parts[i].mask_flags;
 379 -               slave->mtd.size = parts[i].size;
 380 -               slave->mtd.writesize = master->writesize;
 381 -               slave->mtd.oobsize = master->oobsize;
 382 -               slave->mtd.oobavail = master->oobavail;
 383 -               slave->mtd.subpage_sft = master->subpage_sft;
 384 -
 385 -               slave->mtd.name = parts[i].name;
 386 -               slave->mtd.owner = master->owner;
 387 -
 388 -               slave->mtd.read = part_read;
 389 -               slave->mtd.write = part_write;
 390 -
 391 -               if(master->point && master->unpoint){
 392 -                       slave->mtd.point = part_point;
 393 -                       slave->mtd.unpoint = part_unpoint;
 394 -               }
 395 -
 396 -               if (master->read_oob)
 397 -                       slave->mtd.read_oob = part_read_oob;
 398 -               if (master->write_oob)
 399 -                       slave->mtd.write_oob = part_write_oob;
 400 -               if(master->read_user_prot_reg)
 401 -                       slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
 402 -               if(master->read_fact_prot_reg)
 403 -                       slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
 404 -               if(master->write_user_prot_reg)
 405 -                       slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
 406 -               if(master->lock_user_prot_reg)
 407 -                       slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
 408 -               if(master->get_user_prot_info)
 409 -                       slave->mtd.get_user_prot_info = part_get_user_prot_info;
 410 -               if(master->get_fact_prot_info)
 411 -                       slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
 412 -               if (master->sync)
 413 -                       slave->mtd.sync = part_sync;
 414 -               if (!i && master->suspend && master->resume) {
 415 -                               slave->mtd.suspend = part_suspend;
 416 -                               slave->mtd.resume = part_resume;
 417 -               }
 418 -               if (master->writev)
 419 -                       slave->mtd.writev = part_writev;
 420 -               if (master->lock)
 421 -                       slave->mtd.lock = part_lock;
 422 -               if (master->unlock)
 423 -                       slave->mtd.unlock = part_unlock;
 424 -               if (master->block_isbad)
 425 -                       slave->mtd.block_isbad = part_block_isbad;
 426 -               if (master->block_markbad)
 427 -                       slave->mtd.block_markbad = part_block_markbad;
 428 -               slave->mtd.erase = part_erase;
 429 -               slave->master = master;
 430 -               slave->offset = parts[i].offset;
 431 -               slave->index = i;
 432 -
 433 -               if (slave->offset == MTDPART_OFS_APPEND)
 434 -                       slave->offset = cur_offset;
 435 -               if (slave->offset == MTDPART_OFS_NXTBLK) {
 436 -                       slave->offset = cur_offset;
 437 -                       if ((cur_offset % master->erasesize) != 0) {
 438 -                               /* Round up to next erasesize */
 439 -                               slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
 440 -                               printk(KERN_NOTICE "Moving partition %d: "
 441 -                                      "0x%08x -> 0x%08x\n", i,
 442 -                                      cur_offset, slave->offset);
 443 -                       }
 444 -               }
 445 -               if (slave->mtd.size == MTDPART_SIZ_FULL)
 446 -                       slave->mtd.size = master->size - slave->offset;
 447 -               cur_offset = slave->offset + slave->mtd.size;
 448 -
 449 -               printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
 450 -                       slave->offset + slave->mtd.size, slave->mtd.name);
 451 -
 452 -               /* let's do some sanity checks */
 453 -               if (slave->offset >= master->size) {
 454 -                               /* let's register it anyway to preserve ordering */
 455 -                       slave->offset = 0;
 456 -                       slave->mtd.size = 0;
 457 -                       printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
 458 -                               parts[i].name);
 459 -               }
 460 -               if (slave->offset + slave->mtd.size > master->size) {
 461 -                       slave->mtd.size = master->size - slave->offset;
 462 -                       printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
 463 -                               parts[i].name, master->name, slave->mtd.size);
 464 -               }
 465 -               if (master->numeraseregions>1) {
 466 -                       /* Deal with variable erase size stuff */
 467 -                       int i;
 468 -                       struct mtd_erase_region_info *regions = master->eraseregions;
 469 -
 470 -                       /* Find the first erase regions which is part of this partition. */
 471 -                       for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
 472 -                               ;
 473 -
 474 -                       for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
 475 -                               if (slave->mtd.erasesize < regions[i].erasesize) {
 476 -                                       slave->mtd.erasesize = regions[i].erasesize;
 477 -                               }
 478 +       for (i = 0, j = 0; i < nbparts; i++) {
 479 +               part = (struct mtd_partition *) &parts[i];
 480 +               ret = add_one_partition(master, part, j, &slave);
 481 +               if (ret)
 482 +                       return ret;
 483 +               j++;
 484 +
 485 +               if (strcmp(part->name, "rootfs") == 0 && slave->registered) {
 486 +#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
 487 +                       if (ROOT_DEV == 0) {
 488 +                               printk(KERN_NOTICE "mtd: partition \"rootfs\" "
 489 +                                       "set to be root filesystem\n");
 490 +                               ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
 491                         }
 492 -               } else {
 493 -                       /* Single erase size */
 494 -                       slave->mtd.erasesize = master->erasesize;
 495 -               }
 496 -
 497 -               if ((slave->mtd.flags & MTD_WRITEABLE) &&
 498 -                   (slave->offset % slave->mtd.erasesize)) {
 499 -                       /* Doesn't start on a boundary of major erase size */
 500 -                       /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
 501 -                       slave->mtd.flags &= ~MTD_WRITEABLE;
 502 -                       printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 503 -                               parts[i].name);
 504 -               }
 505 -               if ((slave->mtd.flags & MTD_WRITEABLE) &&
 506 -                   (slave->mtd.size % slave->mtd.erasesize)) {
 507 -                       slave->mtd.flags &= ~MTD_WRITEABLE;
 508 -                       printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 509 -                               parts[i].name);
 510 -               }
 511 -
 512 -               slave->mtd.ecclayout = master->ecclayout;
 513 -               if (master->block_isbad) {
 514 -                       uint32_t offs = 0;
 515 -
 516 -                       while(offs < slave->mtd.size) {
 517 -                               if (master->block_isbad(master,
 518 -                                                       offs + slave->offset))
 519 -                                       slave->mtd.ecc_stats.badblocks++;
 520 -                               offs += slave->mtd.erasesize;
 521 -                       }
 522 -               }
 523 -
 524 -               if(parts[i].mtdp)
 525 -               {       /* store the object pointer (caller may or may not register it */
 526 -                       *parts[i].mtdp = &slave->mtd;
 527 -                       slave->registered = 0;
 528 -               }
 529 -               else
 530 -               {
 531 -                       /* register our partition */
 532 -                       add_mtd_device(&slave->mtd);
 533 -                       slave->registered = 1;
 534 +#endif
 535 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 536 +                       ret = split_rootfs_data(master, &slave->mtd, part, j);
 537 +                       if (ret == 0)
 538 +                               j++;
 539 +#endif
 540                 }
 541         }
 542
 543 @@ -557,6 +728,32 @@ int parse_mtd_partitions(struct mtd_info
 544         return ret;
 545  }
 546
 547 +int refresh_mtd_partitions(struct mtd_info *mtd)
 548 +{
 549 +       int ret = 0;
 550 +
 551 +       if (IS_PART(mtd)) {
 552 +               struct mtd_part *part;
 553 +               struct mtd_info *master;
 554 +
 555 +               part = PART(mtd);
 556 +               master = part->master;
 557 +               if (master->refresh_device)
 558 +                       ret = master->refresh_device(master);
 559 +       }
 560 +
 561 +       if (!ret && mtd->refresh_device)
 562 +               ret = mtd->refresh_device(mtd);
 563 +
 564 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 565 +       if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
 566 +               refresh_rootfs_split(mtd);
 567 +#endif
 568 +
 569 +       return 0;
 570 +}
 571 +
 572  EXPORT_SYMBOL_GPL(parse_mtd_partitions);
 573 +EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
 574  EXPORT_SYMBOL_GPL(register_mtd_parser);
 575  EXPORT_SYMBOL_GPL(deregister_mtd_parser);
 576 --- a/drivers/mtd/devices/block2mtd.c
 577 +++ b/drivers/mtd/devices/block2mtd.c
 578 @@ -34,6 +34,8 @@ struct block2mtd_dev {
 579         struct block_device *blkdev;
 580         struct mtd_info mtd;
 581         struct mutex write_mutex;
 582 +       rwlock_t bdev_mutex;
 583 +       char devname[0];
 584  };
 585
 586
 587 @@ -86,6 +88,12 @@ static int block2mtd_erase(struct mtd_in
 588         size_t len = instr->len;
 589         int err;
 590
 591 +       read_lock(&dev->bdev_mutex);
 592 +       if (!dev->blkdev) {
 593 +               err = -EINVAL;
 594 +               goto done;
 595 +       }
 596 +
 597         instr->state = MTD_ERASING;
 598         mutex_lock(&dev->write_mutex);
 599         err = _block2mtd_erase(dev, from, len);
 600 @@ -98,6 +106,10 @@ static int block2mtd_erase(struct mtd_in
 601
 602         instr->state = MTD_ERASE_DONE;
 603         mtd_erase_callback(instr);
 604 +
 605 +done:
 606 +       read_unlock(&dev->bdev_mutex);
 607 +
 608         return err;
 609  }
 610
 611 @@ -109,10 +121,14 @@ static int block2mtd_read(struct mtd_inf
 612         struct page *page;
 613         int index = from >> PAGE_SHIFT;
 614         int offset = from & (PAGE_SIZE-1);
 615 -       int cpylen;
 616 +       int cpylen, err = 0;
 617 +
 618 +       read_lock(&dev->bdev_mutex);
 619 +       if (!dev->blkdev || (from > mtd->size)) {
 620 +               err = -EINVAL;
 621 +               goto done;
 622 +       }
 623
 624 -       if (from > mtd->size)
 625 -               return -EINVAL;
 626         if (from + len > mtd->size)
 627                 len = mtd->size - from;
 628
 629 @@ -127,10 +143,14 @@ static int block2mtd_read(struct mtd_inf
 630                 len = len - cpylen;
 631
 632                 page = page_read(dev->blkdev->bd_inode->i_mapping, index);
 633 -               if (!page)
 634 -                       return -ENOMEM;
 635 -               if (IS_ERR(page))
 636 -                       return PTR_ERR(page);
 637 +               if (!page) {
 638 +                       err = -ENOMEM;
 639 +                       goto done;
 640 +               }
 641 +               if (IS_ERR(page)) {
 642 +                       err = PTR_ERR(page);
 643 +                       goto done;
 644 +               }
 645
 646                 memcpy(buf, page_address(page) + offset, cpylen);
 647                 page_cache_release(page);
 648 @@ -141,7 +161,10 @@ static int block2mtd_read(struct mtd_inf
 649                 offset = 0;
 650                 index++;
 651         }
 652 -       return 0;
 653 +
 654 +done:
 655 +       read_unlock(&dev->bdev_mutex);
 656 +       return err;
 657  }
 658
 659
 660 @@ -193,12 +216,22 @@ static int block2mtd_write(struct mtd_in
 661                 size_t *retlen, const u_char *buf)
 662  {
 663         struct block2mtd_dev *dev = mtd->priv;
 664 -       int err;
 665 +       int err = 0;
 666 +
 667 +       read_lock(&dev->bdev_mutex);
 668 +       if (!dev->blkdev) {
 669 +               err = -EINVAL;
 670 +               goto done;
 671 +       }
 672
 673         if (!len)
 674 -               return 0;
 675 -       if (to >= mtd->size)
 676 -               return -ENOSPC;
 677 +               goto done;
 678 +
 679 +       if (to >= mtd->size) {
 680 +               err = -ENOSPC;
 681 +               goto done;
 682 +       }
 683 +
 684         if (to + len > mtd->size)
 685                 len = mtd->size - to;
 686
 687 @@ -207,6 +240,9 @@ static int block2mtd_write(struct mtd_in
 688         mutex_unlock(&dev->write_mutex);
 689         if (err > 0)
 690                 err = 0;
 691 +
 692 +done:
 693 +       read_unlock(&dev->bdev_mutex);
 694         return err;
 695  }
 696
 697 @@ -215,51 +251,29 @@ static int block2mtd_write(struct mtd_in
 698  static void block2mtd_sync(struct mtd_info *mtd)
 699  {
 700         struct block2mtd_dev *dev = mtd->priv;
 701 -       sync_blockdev(dev->blkdev);
 702 -       return;
 703 -}
 704 -
 705 -
 706 -static void block2mtd_free_device(struct block2mtd_dev *dev)
 707 -{
 708 -       if (!dev)
 709 -               return;
 710 -
 711 -       kfree(dev->mtd.name);
 712
 713 -       if (dev->blkdev) {
 714 -               invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
 715 -                                       0, -1);
 716 -               close_bdev_excl(dev->blkdev);
 717 -       }
 718 +       read_lock(&dev->bdev_mutex);
 719 +       if (dev->blkdev)
 720 +               sync_blockdev(dev->blkdev);
 721 +       read_unlock(&dev->bdev_mutex);
 722
 723 -       kfree(dev);
 724 +       return;
 725  }
 726
 727
 728 -/* FIXME: ensure that mtd->size % erase_size == 0 */
 729 -static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
 730 +static int _open_bdev(struct block2mtd_dev *dev)
 731  {
 732         struct block_device *bdev;
 733 -       struct block2mtd_dev *dev;
 734 -       struct mtd_partition *part;
 735 -
 736 -       if (!devname)
 737 -               return NULL;
 738 -
 739 -       dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
 740 -       if (!dev)
 741 -               return NULL;
 742
 743         /* Get a handle on the device */
 744 -       bdev = open_bdev_excl(devname, O_RDWR, NULL);
 745 +       bdev = open_bdev_excl(dev->devname, O_RDWR, NULL);
 746  #ifndef MODULE
 747         if (IS_ERR(bdev)) {
 748
 749                 /* We might not have rootfs mounted at this point. Try
 750                    to resolve the device name by other means. */
 751
 752 -               dev_t devt = name_to_dev_t(devname);
 753 +               dev_t devt = name_to_dev_t(dev->devname);
 754                 if (devt) {
 755                         bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
 756                 }
 757 @@ -267,17 +281,96 @@ static struct block2mtd_dev *add_device(
 758  #endif
 759
 760         if (IS_ERR(bdev)) {
 761 -               ERROR("error: cannot open device %s", devname);
 762 -               goto devinit_err;
 763 +               ERROR("error: cannot open device %s", dev->devname);
 764 +               return 1;
 765         }
 766         dev->blkdev = bdev;
 767
 768         if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
 769                 ERROR("attempting to use an MTD device as a block device");
 770 -               goto devinit_err;
 771 +               return 1;
 772         }
 773
 774 +       return 0;
 775 +}
 776 +
 777 +static void _close_bdev(struct block2mtd_dev *dev)
 778 +{
 779 +       struct block_device *bdev;
 780 +
 781 +       if (!dev->blkdev)
 782 +               return;
 783 +
 784 +       bdev = dev->blkdev;
 785 +       invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, 0, -1);
 786 +       close_bdev_excl(dev->blkdev);
 787 +       dev->blkdev = NULL;
 788 +}
 789 +
 790 +static void block2mtd_free_device(struct block2mtd_dev *dev)
 791 +{
 792 +       if (!dev)
 793 +               return;
 794 +
 795 +       kfree(dev->mtd.name);
 796 +       _close_bdev(dev);
 797 +       kfree(dev);
 798 +}
 799 +
 800 +
 801 +static int block2mtd_refresh(struct mtd_info *mtd)
 802 +{
 803 +       struct block2mtd_dev *dev = mtd->priv;
 804 +       struct block_device *bdev;
 805 +       dev_t devt;
 806 +       int err = 0;
 807 +
 808 +       /* no other mtd function can run at this point */
 809 +       write_lock(&dev->bdev_mutex);
 810 +
 811 +       /* get the device number for the whole disk */
 812 +       devt = MKDEV(MAJOR(dev->blkdev->bd_dev), 0);
 813 +
 814 +       /* close the old block device */
 815 +       _close_bdev(dev);
 816 +
 817 +       /* open the whole disk, issue a partition rescan, then */
 818 +       bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
 819 +       if (!bdev || !bdev->bd_disk)
 820 +               err = -EINVAL;
 821 +       else {
 822 +               err = rescan_partitions(bdev->bd_disk, bdev);
 823 +       }
 824 +       if (bdev)
 825 +               close_bdev_excl(bdev);
 826 +
 827 +       /* try to open the partition block device again */
 828 +       _open_bdev(dev);
 829 +       write_unlock(&dev->bdev_mutex);
 830 +
 831 +       return err;
 832 +}
 833 +
 834 +/* FIXME: ensure that mtd->size % erase_size == 0 */
 835 +static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
 836 +{
 837 +       struct block2mtd_dev *dev;
 838 +       struct mtd_partition *part;
 839 +
 840 +       if (!devname)
 841 +               return NULL;
 842 +
 843 +       dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL);
 844 +       if (!dev)
 845 +               return NULL;
 846 +
 847 +       strcpy(dev->devname, devname);
 848 +
 849 +       if (_open_bdev(dev))
 850 +               goto devinit_err;
 851 +
 852         mutex_init(&dev->write_mutex);
 853 +       rwlock_init(&dev->bdev_mutex);
 854
 855         /* Setup the MTD structure */
 856         /* make the name contain the block device in */
 857 @@ -304,6 +397,7 @@ static struct block2mtd_dev *add_device(
 858         dev->mtd.read = block2mtd_read;
 859         dev->mtd.priv = dev;
 860         dev->mtd.owner = THIS_MODULE;
 861 +       dev->mtd.refresh_device = block2mtd_refresh;
 862
 863         part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
 864         part->name = dev->mtd.name;
 865 --- a/drivers/mtd/mtdchar.c
 866 +++ b/drivers/mtd/mtdchar.c
 867 @@ -17,6 +17,7 @@
 868
 869  #include <linux/mtd/mtd.h>
 870  #include <linux/mtd/compatmac.h>
 871 +#include <linux/mtd/partitions.h>
 872
 873  #include <asm/uaccess.h>
 874
 875 @@ -754,6 +755,13 @@ static int mtd_ioctl(struct inode *inode
 876                 file->f_pos = 0;
 877                 break;
 878         }
 879 +#ifdef CONFIG_MTD_PARTITIONS
 880 +       case MTDREFRESH:
 881 +       {
 882 +               ret = refresh_mtd_partitions(mtd);
 883 +               break;
 884 +       }
 885 +#endif
 886
 887         default:
 888                 ret = -ENOTTY;
 889 --- a/include/linux/mtd/mtd.h
 890 +++ b/include/linux/mtd/mtd.h
 891 @@ -98,6 +98,7 @@ struct mtd_oob_ops {
 892         uint8_t         *oobbuf;
 893  };
 894
 895 +struct mtd_info;
 896  struct mtd_info {
 897         u_char type;
 898         u_int32_t flags;
 899 @@ -202,6 +203,9 @@ struct mtd_info {
 900         struct module *owner;
 901         int usecount;
 902
 903 +       int (*refresh_device)(struct mtd_info *mtd);
 904 +       struct mtd_info *split;
 905 +
 906         /* If the driver is something smart, like UBI, it may need to maintain
 907          * its own reference counting. The below functions are only for driver.
 908          * The driver may register its callbacks. These callbacks are not
 909 --- a/include/linux/mtd/partitions.h
 910 +++ b/include/linux/mtd/partitions.h
 911 @@ -36,6 +36,7 @@
 912   * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
 913   */
 914
 915 +struct mtd_partition;
 916  struct mtd_partition {
 917         char *name;                     /* identifier string */
 918         u_int32_t size;                 /* partition size */
 919 @@ -43,6 +44,7 @@ struct mtd_partition {
 920         u_int32_t mask_flags;           /* master MTD flags to mask out for this partition */
 921         struct nand_ecclayout *ecclayout;       /* out of band layout for this partition (NAND only)*/
 922         struct mtd_info **mtdp;         /* pointer to store the MTD object */
 923 +       int (*refresh_partition)(struct mtd_info *);
 924  };
 925
 926  #define MTDPART_OFS_NXTBLK     (-2)
 927 @@ -52,6 +54,7 @@ struct mtd_partition {
 928
 929  int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
 930  int del_mtd_partitions(struct mtd_info *);
 931 +int refresh_mtd_partitions(struct mtd_info *);
 932
 933  /*
 934   * Functions dealing with the various ways of partitioning the space
 935 --- a/include/mtd/mtd-abi.h
 936 +++ b/include/mtd/mtd-abi.h
 937 @@ -95,6 +95,7 @@ struct otp_info {
 938  #define ECCGETLAYOUT           _IOR('M', 17, struct nand_ecclayout)
 939  #define ECCGETSTATS            _IOR('M', 18, struct mtd_ecc_stats)
 940  #define MTDFILEMODE            _IO('M', 19)
 941 +#define MTDREFRESH             _IO('M', 23)
 942
 943  /*
 944   * Obsolete legacy interface. Keep it in order not to break userspace