target/linux/generic/patches-2.6.38/065-rootfs_split.patch

   1 Index: linux-2.6.38-rc6/drivers/mtd/Kconfig
   2 ===================================================================
   3 --- linux-2.6.38-rc6.orig/drivers/mtd/Kconfig   2011-02-28 16:14:12.668466637 +0100
   4 +++ linux-2.6.38-rc6/drivers/mtd/Kconfig        2011-02-28 16:26:55.463734599 +0100
   5 @@ -55,6 +55,16 @@ config MTD_PARTITIONS
   6
   7  if MTD_PARTITIONS
   8
   9 +config MTD_ROOTFS_ROOT_DEV
  10 +       bool "Automatically set 'rootfs' partition to be root filesystem"
  11 +       depends on MTD_PARTITIONS
  12 +       default y
  13 +
  14 +config MTD_ROOTFS_SPLIT
  15 +       bool "Automatically split 'rootfs' partition for squashfs"
  16 +       depends on MTD_PARTITIONS
  17 +       default y
  18 +
  19  config MTD_REDBOOT_PARTS
  20         tristate "RedBoot partition table parsing"
  21         ---help---
  22 Index: linux-2.6.38-rc6/drivers/mtd/mtdpart.c
  23 ===================================================================
  24 --- linux-2.6.38-rc6.orig/drivers/mtd/mtdpart.c 2011-02-28 16:14:12.686466221 +0100
  25 +++ linux-2.6.38-rc6/drivers/mtd/mtdpart.c      2011-02-28 16:28:41.399156164 +0100
  26 @@ -29,6 +29,8 @@
  27  #include <linux/kmod.h>
  28  #include <linux/mtd/mtd.h>
  29  #include <linux/mtd/partitions.h>
  30 +#include <linux/root_dev.h>
  31 +#include <linux/magic.h>
  32  #include <linux/err.h>
  33
  34  /* Our partition linked list */
  35 @@ -48,7 +50,7 @@ struct mtd_part {
  36   * the pointer to that structure with this macro.
  37   */
  38  #define PART(x)  ((struct mtd_part *)(x))
  39 -
  40 +#define IS_PART(mtd) (mtd->read == part_read)
  41
  42  /*
  43   * MTD methods which simply translate the effective address and pass through
  44 @@ -636,6 +638,153 @@ int mtd_del_partition(struct mtd_info *m
  45  }
  46  EXPORT_SYMBOL_GPL(mtd_del_partition);
  47
  48 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
  49 +#define ROOTFS_SPLIT_NAME "rootfs_data"
  50 +#define ROOTFS_REMOVED_NAME "<removed>"
  51 +
  52 +struct squashfs_super_block {
  53 +       __le32 s_magic;
  54 +       __le32 pad0[9];
  55 +       __le64 bytes_used;
  56 +};
  57 +
  58 +
  59 +static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
  60 +{
  61 +       struct squashfs_super_block sb;
  62 +       int len, ret;
  63 +
  64 +       ret = master->read(master, offset, sizeof(sb), &len, (void *) &sb);
  65 +       if (ret || (len != sizeof(sb))) {
  66 +               printk(KERN_ALERT "split_squashfs: error occured while reading "
  67 +                       "from \"%s\"\n", master->name);
  68 +               return -EINVAL;
  69 +       }
  70 +
  71 +       if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
  72 +               printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
  73 +                       master->name);
  74 +               *split_offset = 0;
  75 +               return 0;
  76 +       }
  77 +
  78 +       if (le64_to_cpu((sb.bytes_used)) <= 0) {
  79 +               printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
  80 +                       master->name);
  81 +               *split_offset = 0;
  82 +               return 0;
  83 +       }
  84 +
  85 +       len = (u32) le64_to_cpu(sb.bytes_used);
  86 +       len += (offset & 0x000fffff);
  87 +       len +=  (master->erasesize - 1);
  88 +       len &= ~(master->erasesize - 1);
  89 +       len -= (offset & 0x000fffff);
  90 +       *split_offset = offset + len;
  91 +
  92 +       return 0;
  93 +}
  94 +
  95 +static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part)
  96 +{
  97 +       struct mtd_partition *dpart;
  98 +       struct mtd_part *slave = NULL;
  99 +       int ret, split_offset = 0;
 100 +
 101 +       ret = split_squashfs(master, part->offset, &split_offset);
 102 +       if (ret)
 103 +               return ret;
 104 +
 105 +       if (split_offset <= 0)
 106 +               return 0;
 107 +
 108 +       dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
 109 +       if (dpart == NULL) {
 110 +               printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
 111 +                       ROOTFS_SPLIT_NAME);
 112 +               return -ENOMEM;
 113 +       }
 114 +
 115 +       memcpy(dpart, part, sizeof(*part));
 116 +       dpart->name = (unsigned char *)&dpart[1];
 117 +       strcpy(dpart->name, ROOTFS_SPLIT_NAME);
 118 +
 119 +       dpart->size -= split_offset - dpart->offset;
 120 +       dpart->offset = split_offset;
 121 +
 122 +       if (dpart == NULL)
 123 +               return 1;
 124 +
 125 +       printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
 126 +               ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
 127 +
 128 +       slave = allocate_partition(master, dpart, 0, split_offset);
 129 +       if (IS_ERR(slave))
 130 +               return PTR_ERR(slave);
 131 +       mutex_lock(&mtd_partitions_mutex);
 132 +       list_add(&slave->list, &mtd_partitions);
 133 +       mutex_unlock(&mtd_partitions_mutex);
 134 +
 135 +       add_mtd_device(&slave->mtd);
 136 +
 137 +       rpart->split = &slave->mtd;
 138 +
 139 +       return 0;
 140 +}
 141 +
 142 +static int refresh_rootfs_split(struct mtd_info *mtd)
 143 +{
 144 +       struct mtd_partition tpart;
 145 +       struct mtd_part *part;
 146 +       char *name;
 147 +       //int index = 0;
 148 +       int offset, size;
 149 +       int ret;
 150 +
 151 +       part = PART(mtd);
 152 +
 153 +       /* check for the new squashfs offset first */
 154 +       ret = split_squashfs(part->master, part->offset, &offset);
 155 +       if (ret)
 156 +               return ret;
 157 +
 158 +       if ((offset > 0) && !mtd->split) {
 159 +               printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
 160 +               /* if we don't have a rootfs split partition, create a new one */
 161 +               tpart.name = (char *) mtd->name;
 162 +               tpart.size = mtd->size;
 163 +               tpart.offset = part->offset;
 164 +
 165 +               return split_rootfs_data(part->master, &part->mtd, &tpart);
 166 +       } else if ((offset > 0) && mtd->split) {
 167 +               /* update the offsets of the existing partition */
 168 +               size = mtd->size + part->offset - offset;
 169 +
 170 +               part = PART(mtd->split);
 171 +               part->offset = offset;
 172 +               part->mtd.size = size;
 173 +               printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
 174 +                       __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
 175 +                       (u32) part->offset, (u32) part->mtd.size);
 176 +               name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 177 +               strcpy(name, ROOTFS_SPLIT_NAME);
 178 +               part->mtd.name = name;
 179 +       } else if ((offset <= 0) && mtd->split) {
 180 +               printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
 181 +
 182 +               /* mark existing partition as removed */
 183 +               part = PART(mtd->split);
 184 +               name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 185 +               strcpy(name, ROOTFS_REMOVED_NAME);
 186 +               part->mtd.name = name;
 187 +               part->offset = 0;
 188 +               part->mtd.size = 0;
 189 +       }
 190 +
 191 +       return 0;
 192 +}
 193 +#endif /* CONFIG_MTD_ROOTFS_SPLIT */
 194 +
 195  /*
 196   * This function, given a master MTD object and a partition table, creates
 197   * and registers slave MTD objects which are bound to the master according to
 198 @@ -652,6 +801,9 @@ int add_mtd_partitions(struct mtd_info *
 199         struct mtd_part *slave;
 200         uint64_t cur_offset = 0;
 201         int i;
 202 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 203 +       int ret;
 204 +#endif
 205
 206         printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 207
 208 @@ -666,6 +818,21 @@ int add_mtd_partitions(struct mtd_info *
 209
 210                 add_mtd_device(&slave->mtd);
 211
 212 +               if (!strcmp(parts[i].name, "rootfs")) {
 213 +#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
 214 +                       if (ROOT_DEV == 0) {
 215 +                               printk(KERN_NOTICE "mtd: partition \"rootfs\" "
 216 +                                       "set to be root filesystem\n");
 217 +                               ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
 218 +                       }
 219 +#endif
 220 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 221 +                       ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
 222 +                       /* if (ret == 0)
 223 +                        *      j++; */
 224 +#endif
 225 +               }
 226 +
 227                 cur_offset = slave->offset + slave->mtd.size;
 228         }
 229
 230 @@ -673,6 +840,32 @@ int add_mtd_partitions(struct mtd_info *
 231  }
 232  EXPORT_SYMBOL(add_mtd_partitions);
 233
 234 +int refresh_mtd_partitions(struct mtd_info *mtd)
 235 +{
 236 +       int ret = 0;
 237 +
 238 +       if (IS_PART(mtd)) {
 239 +               struct mtd_part *part;
 240 +               struct mtd_info *master;
 241 +
 242 +               part = PART(mtd);
 243 +               master = part->master;
 244 +               if (master->refresh_device)
 245 +                       ret = master->refresh_device(master);
 246 +       }
 247 +
 248 +       if (!ret && mtd->refresh_device)
 249 +               ret = mtd->refresh_device(mtd);
 250 +
 251 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 252 +       if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
 253 +               refresh_rootfs_split(mtd);
 254 +#endif
 255 +
 256 +       return 0;
 257 +}
 258 +EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
 259 +
 260  static DEFINE_SPINLOCK(part_parser_lock);
 261  static LIST_HEAD(part_parsers);
 262
 263 Index: linux-2.6.38-rc6/drivers/mtd/devices/block2mtd.c
 264 ===================================================================
 265 --- linux-2.6.38-rc6.orig/drivers/mtd/devices/block2mtd.c       2011-02-28 16:15:07.477184360 +0100
 266 +++ linux-2.6.38-rc6/drivers/mtd/devices/block2mtd.c    2011-02-28 16:26:55.919727057 +0100
 267 @@ -30,6 +30,8 @@ struct block2mtd_dev {
 268         struct block_device *blkdev;
 269         struct mtd_info mtd;
 270         struct mutex write_mutex;
 271 +       rwlock_t bdev_mutex;
 272 +       char devname[0];
 273  };
 274
 275
 276 @@ -82,6 +84,12 @@ static int block2mtd_erase(struct mtd_in
 277         size_t len = instr->len;
 278         int err;
 279
 280 +       read_lock(&dev->bdev_mutex);
 281 +       if (!dev->blkdev) {
 282 +               err = -EINVAL;
 283 +               goto done;
 284 +       }
 285 +
 286         instr->state = MTD_ERASING;
 287         mutex_lock(&dev->write_mutex);
 288         err = _block2mtd_erase(dev, from, len);
 289 @@ -93,6 +101,10 @@ static int block2mtd_erase(struct mtd_in
 290                 instr->state = MTD_ERASE_DONE;
 291
 292         mtd_erase_callback(instr);
 293 +
 294 +done:
 295 +       read_unlock(&dev->bdev_mutex);
 296 +
 297         return err;
 298  }
 299
 300 @@ -104,10 +116,14 @@ static int block2mtd_read(struct mtd_inf
 301         struct page *page;
 302         int index = from >> PAGE_SHIFT;
 303         int offset = from & (PAGE_SIZE-1);
 304 -       int cpylen;
 305 +       int cpylen, err = 0;
 306 +
 307 +       read_lock(&dev->bdev_mutex);
 308 +       if (!dev->blkdev || (from > mtd->size)) {
 309 +               err = -EINVAL;
 310 +               goto done;
 311 +       }
 312
 313 -       if (from > mtd->size)
 314 -               return -EINVAL;
 315         if (from + len > mtd->size)
 316                 len = mtd->size - from;
 317
 318 @@ -122,10 +138,14 @@ static int block2mtd_read(struct mtd_inf
 319                 len = len - cpylen;
 320
 321                 page = page_read(dev->blkdev->bd_inode->i_mapping, index);
 322 -               if (!page)
 323 -                       return -ENOMEM;
 324 -               if (IS_ERR(page))
 325 -                       return PTR_ERR(page);
 326 +               if (!page) {
 327 +                       err = -ENOMEM;
 328 +                       goto done;
 329 +               }
 330 +               if (IS_ERR(page)) {
 331 +                       err = PTR_ERR(page);
 332 +                       goto done;
 333 +               }
 334
 335                 memcpy(buf, page_address(page) + offset, cpylen);
 336                 page_cache_release(page);
 337 @@ -136,7 +156,10 @@ static int block2mtd_read(struct mtd_inf
 338                 offset = 0;
 339                 index++;
 340         }
 341 -       return 0;
 342 +
 343 +done:
 344 +       read_unlock(&dev->bdev_mutex);
 345 +       return err;
 346  }
 347
 348
 349 @@ -188,12 +211,22 @@ static int block2mtd_write(struct mtd_in
 350                 size_t *retlen, const u_char *buf)
 351  {
 352         struct block2mtd_dev *dev = mtd->priv;
 353 -       int err;
 354 +       int err = 0;
 355 +
 356 +       read_lock(&dev->bdev_mutex);
 357 +       if (!dev->blkdev) {
 358 +               err = -EINVAL;
 359 +               goto done;
 360 +       }
 361
 362         if (!len)
 363 -               return 0;
 364 -       if (to >= mtd->size)
 365 -               return -ENOSPC;
 366 +               goto done;
 367 +
 368 +       if (to >= mtd->size) {
 369 +               err = -ENOSPC;
 370 +               goto done;
 371 +       }
 372 +
 373         if (to + len > mtd->size)
 374                 len = mtd->size - to;
 375
 376 @@ -202,6 +235,9 @@ static int block2mtd_write(struct mtd_in
 377         mutex_unlock(&dev->write_mutex);
 378         if (err > 0)
 379                 err = 0;
 380 +
 381 +done:
 382 +       read_unlock(&dev->bdev_mutex);
 383         return err;
 384  }
 385
 386 @@ -210,33 +246,109 @@ static int block2mtd_write(struct mtd_in
 387  static void block2mtd_sync(struct mtd_info *mtd)
 388  {
 389         struct block2mtd_dev *dev = mtd->priv;
 390 +       read_lock(&dev->bdev_mutex);
 391 +       if (dev->blkdev)
 392         sync_blockdev(dev->blkdev);
 393 +       read_unlock(&dev->bdev_mutex);
 394 +
 395         return;
 396  }
 397
 398
 399 +static int _open_bdev(struct block2mtd_dev *dev)
 400 +{
 401 +       const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
 402 +       struct block_device *bdev;
 403 +
 404 +       /* Get a handle on the device */
 405 +       bdev = blkdev_get_by_path(dev->devname, mode, dev);
 406 +#ifndef MODULE
 407 +       if (IS_ERR(bdev)) {
 408 +
 409 +               /* We might not have rootfs mounted at this point. Try
 410 +                  to resolve the device name by other means. */
 411 +
 412 +               dev_t devt = name_to_dev_t(dev->devname);
 413 +               if (devt)
 414 +                       bdev = blkdev_get_by_dev(devt, mode, dev);
 415 +       }
 416 +#endif
 417 +
 418 +       if (IS_ERR(bdev)) {
 419 +               ERROR("error: cannot open device %s", dev->devname);
 420 +               return 1;
 421 +       }
 422 +       dev->blkdev = bdev;
 423 +
 424 +       if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
 425 +               ERROR("attempting to use an MTD device as a block device");
 426 +               return 1;
 427 +       }
 428 +
 429 +       return 0;
 430 +}
 431 +
 432 +static void _close_bdev(struct block2mtd_dev *dev)
 433 +{
 434 +       struct block_device *bdev;
 435 +
 436 +       if (!dev->blkdev)
 437 +               return;
 438 +
 439 +       bdev = dev->blkdev;
 440 +       invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, 0, -1);
 441 +       blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 442 +       dev->blkdev = NULL;
 443 +}
 444 +
 445  static void block2mtd_free_device(struct block2mtd_dev *dev)
 446  {
 447         if (!dev)
 448                 return;
 449
 450         kfree(dev->mtd.name);
 451 -
 452 -       if (dev->blkdev) {
 453 -               invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
 454 -                                       0, -1);
 455 -               blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 456 -       }
 457 -
 458 +       _close_bdev(dev);
 459         kfree(dev);
 460  }
 461
 462
 463 -/* FIXME: ensure that mtd->size % erase_size == 0 */
 464 -static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
 465 +static int block2mtd_refresh(struct mtd_info *mtd)
 466  {
 467 -       const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
 468 +       struct block2mtd_dev *dev = mtd->priv;
 469         struct block_device *bdev;
 470 +       dev_t devt;
 471 +       int err = 0;
 472 +
 473 +       /* no other mtd function can run at this point */
 474 +       write_lock(&dev->bdev_mutex);
 475 +
 476 +       /* get the device number for the whole disk */
 477 +       devt = MKDEV(MAJOR(dev->blkdev->bd_dev), 0);
 478 +
 479 +       /* close the old block device */
 480 +       _close_bdev(dev);
 481 +
 482 +       /* open the whole disk, issue a partition rescan, then */
 483 +       bdev = blkdev_get_by_dev(devt, FMODE_WRITE | FMODE_READ);
 484 +       if (!bdev || !bdev->bd_disk)
 485 +               err = -EINVAL;
 486 +#ifndef CONFIG_MTD_BLOCK2MTD_MODULE
 487 +       else
 488 +               err = rescan_partitions(bdev->bd_disk, bdev);
 489 +#endif
 490 +       if (bdev)
 491 +               blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 492 +
 493 +       /* try to open the partition block device again */
 494 +       _open_bdev(dev);
 495 +       write_unlock(&dev->bdev_mutex);
 496 +
 497 +       return err;
 498 +}
 499 +
 500 +/* FIXME: ensure that mtd->size % erase_size == 0 */
 501 +static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
 502 +{
 503         struct block2mtd_dev *dev;
 504         struct mtd_partition *part;
 505         char *name;
 506 @@ -244,36 +356,17 @@ static struct block2mtd_dev *add_device(
 507         if (!devname)
 508                 return NULL;
 509
 510 -       dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
 511 +       dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL);
 512         if (!dev)
 513                 return NULL;
 514
 515 -       /* Get a handle on the device */
 516 -       bdev = blkdev_get_by_path(devname, mode, dev);
 517 -#ifndef MODULE
 518 -       if (IS_ERR(bdev)) {
 519 -
 520 -               /* We might not have rootfs mounted at this point. Try
 521 -                  to resolve the device name by other means. */
 522 +       strcpy(dev->devname, devname);
 523
 524 -               dev_t devt = name_to_dev_t(devname);
 525 -               if (devt)
 526 -                       bdev = blkdev_get_by_dev(devt, mode, dev);
 527 -       }
 528 -#endif
 529 -
 530 -       if (IS_ERR(bdev)) {
 531 -               ERROR("error: cannot open device %s", devname);
 532 +       if (_open_bdev(dev))
 533                 goto devinit_err;
 534 -       }
 535 -       dev->blkdev = bdev;
 536 -
 537 -       if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
 538 -               ERROR("attempting to use an MTD device as a block device");
 539 -               goto devinit_err;
 540 -       }
 541
 542         mutex_init(&dev->write_mutex);
 543 +       rwlock_init(&dev->bdev_mutex);
 544
 545         /* Setup the MTD structure */
 546         /* make the name contain the block device in */
 547 @@ -298,6 +391,7 @@ static struct block2mtd_dev *add_device(
 548         dev->mtd.read = block2mtd_read;
 549         dev->mtd.priv = dev;
 550         dev->mtd.owner = THIS_MODULE;
 551 +       dev->mtd.refresh_device = block2mtd_refresh;
 552
 553         part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
 554         part->name = dev->mtd.name;
 555 Index: linux-2.6.38-rc6/drivers/mtd/mtdchar.c
 556 ===================================================================
 557 --- linux-2.6.38-rc6.orig/drivers/mtd/mtdchar.c 2011-02-28 16:14:12.652467007 +0100
 558 +++ linux-2.6.38-rc6/drivers/mtd/mtdchar.c      2011-02-28 16:15:07.503183744 +0100
 559 @@ -841,6 +841,13 @@ static int mtd_ioctl(struct file *file,
 560                 file->f_pos = 0;
 561                 break;
 562         }
 563 +#ifdef CONFIG_MTD_PARTITIONS
 564 +       case MTDREFRESH:
 565 +       {
 566 +               ret = refresh_mtd_partitions(mtd);
 567 +               break;
 568 +       }
 569 +#endif
 570
 571         case OTPGETREGIONCOUNT:
 572         case OTPGETREGIONINFO:
 573 Index: linux-2.6.38-rc6/include/linux/mtd/mtd.h
 574 ===================================================================
 575 --- linux-2.6.38-rc6.orig/include/linux/mtd/mtd.h       2011-02-28 16:14:12.613467908 +0100
 576 +++ linux-2.6.38-rc6/include/linux/mtd/mtd.h    2011-02-28 16:26:51.223804561 +0100
 577 @@ -125,6 +125,7 @@ struct nand_ecclayout {
 578         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 579  };
 580
 581 +struct mtd_info;
 582  struct mtd_info {
 583         u_char type;
 584         uint32_t flags;
 585 @@ -277,6 +278,9 @@ struct mtd_info {
 586         struct device dev;
 587         int usecount;
 588
 589 +       int (*refresh_device)(struct mtd_info *mtd);
 590 +       struct mtd_info *split;
 591 +
 592         /* If the driver is something smart, like UBI, it may need to maintain
 593          * its own reference counting. The below functions are only for driver.
 594          * The driver may register its callbacks. These callbacks are not
 595 Index: linux-2.6.38-rc6/include/linux/mtd/partitions.h
 596 ===================================================================
 597 --- linux-2.6.38-rc6.orig/include/linux/mtd/partitions.h        2011-02-28 16:14:12.635467400 +0100
 598 +++ linux-2.6.38-rc6/include/linux/mtd/partitions.h     2011-02-28 16:26:55.382735938 +0100
 599 @@ -34,12 +34,14 @@
 600   * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
 601   */
 602
 603 +struct mtd_partition;
 604  struct mtd_partition {
 605         char *name;                     /* identifier string */
 606         uint64_t size;                  /* partition size */
 607         uint64_t offset;                /* offset within the master MTD space */
 608         uint32_t mask_flags;            /* master MTD flags to mask out for this partition */
 609         struct nand_ecclayout *ecclayout;       /* out of band layout for this partition (NAND only) */
 610 +       int (*refresh_partition)(struct mtd_info *);
 611  };
 612
 613  #define MTDPART_OFS_NXTBLK     (-2)
 614 @@ -51,6 +53,7 @@ struct mtd_info;
 615
 616  int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
 617  int del_mtd_partitions(struct mtd_info *);
 618 +int refresh_mtd_partitions(struct mtd_info *);
 619
 620  /*
 621   * Functions dealing with the various ways of partitioning the space
 622 Index: linux-2.6.38-rc6/include/mtd/mtd-abi.h
 623 ===================================================================
 624 --- linux-2.6.38-rc6.orig/include/mtd/mtd-abi.h 2011-02-28 16:14:12.596468301 +0100
 625 +++ linux-2.6.38-rc6/include/mtd/mtd-abi.h      2011-02-28 16:15:07.505183696 +0100
 626 @@ -127,6 +127,7 @@ struct otp_info {
 627  #define MEMWRITEOOB64          _IOWR('M', 21, struct mtd_oob_buf64)
 628  #define MEMREADOOB64           _IOWR('M', 22, struct mtd_oob_buf64)
 629  #define MEMISLOCKED            _IOR('M', 23, struct erase_info_user)
 630 +#define MTDREFRESH             _IO('M', 23)
 631
 632  /*
 633   * Obsolete legacy interface. Keep it in order not to break userspace