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

   1 --- a/drivers/mtd/Kconfig
   2 +++ b/drivers/mtd/Kconfig
   3 @@ -55,6 +55,16 @@ config MTD_PARTITIONS
   4
   5  if MTD_PARTITIONS
   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         ---help---
  20 --- a/drivers/mtd/mtdpart.c
  21 +++ b/drivers/mtd/mtdpart.c
  22 @@ -29,6 +29,8 @@
  23  #include <linux/kmod.h>
  24  #include <linux/mtd/mtd.h>
  25  #include <linux/mtd/partitions.h>
  26 +#include <linux/root_dev.h>
  27 +#include <linux/magic.h>
  28  #include <linux/err.h>
  29
  30  /* Our partition linked list */
  31 @@ -48,7 +50,7 @@ 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 @@ -636,6 +638,153 @@ int mtd_del_partition(struct mtd_info *m
  41  }
  42  EXPORT_SYMBOL_GPL(mtd_del_partition);
  43
  44 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
  45 +#define ROOTFS_SPLIT_NAME "rootfs_data"
  46 +#define ROOTFS_REMOVED_NAME "<removed>"
  47 +
  48 +struct squashfs_super_block {
  49 +       __le32 s_magic;
  50 +       __le32 pad0[9];
  51 +       __le64 bytes_used;
  52 +};
  53 +
  54 +
  55 +static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
  56 +{
  57 +       struct squashfs_super_block sb;
  58 +       int len, ret;
  59 +
  60 +       ret = master->read(master, offset, sizeof(sb), &len, (void *) &sb);
  61 +       if (ret || (len != sizeof(sb))) {
  62 +               printk(KERN_ALERT "split_squashfs: error occured while reading "
  63 +                       "from \"%s\"\n", master->name);
  64 +               return -EINVAL;
  65 +       }
  66 +
  67 +       if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
  68 +               printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
  69 +                       master->name);
  70 +               *split_offset = 0;
  71 +               return 0;
  72 +       }
  73 +
  74 +       if (le64_to_cpu((sb.bytes_used)) <= 0) {
  75 +               printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
  76 +                       master->name);
  77 +               *split_offset = 0;
  78 +               return 0;
  79 +       }
  80 +
  81 +       len = (u32) le64_to_cpu(sb.bytes_used);
  82 +       len += (offset & 0x000fffff);
  83 +       len +=  (master->erasesize - 1);
  84 +       len &= ~(master->erasesize - 1);
  85 +       len -= (offset & 0x000fffff);
  86 +       *split_offset = offset + len;
  87 +
  88 +       return 0;
  89 +}
  90 +
  91 +static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part)
  92 +{
  93 +       struct mtd_partition *dpart;
  94 +       struct mtd_part *slave = NULL;
  95 +       int ret, split_offset = 0;
  96 +
  97 +       ret = split_squashfs(master, part->offset, &split_offset);
  98 +       if (ret)
  99 +               return ret;
 100 +
 101 +       if (split_offset <= 0)
 102 +               return 0;
 103 +
 104 +       dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
 105 +       if (dpart == NULL) {
 106 +               printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
 107 +                       ROOTFS_SPLIT_NAME);
 108 +               return -ENOMEM;
 109 +       }
 110 +
 111 +       memcpy(dpart, part, sizeof(*part));
 112 +       dpart->name = (unsigned char *)&dpart[1];
 113 +       strcpy(dpart->name, ROOTFS_SPLIT_NAME);
 114 +
 115 +       dpart->size -= split_offset - dpart->offset;
 116 +       dpart->offset = split_offset;
 117 +
 118 +       if (dpart == NULL)
 119 +               return 1;
 120 +
 121 +       printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
 122 +               ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
 123 +
 124 +       slave = allocate_partition(master, dpart, 0, split_offset);
 125 +       if (IS_ERR(slave))
 126 +               return PTR_ERR(slave);
 127 +       mutex_lock(&mtd_partitions_mutex);
 128 +       list_add(&slave->list, &mtd_partitions);
 129 +       mutex_unlock(&mtd_partitions_mutex);
 130 +
 131 +       add_mtd_device(&slave->mtd);
 132 +
 133 +       rpart->split = &slave->mtd;
 134 +
 135 +       return 0;
 136 +}
 137 +
 138 +static int refresh_rootfs_split(struct mtd_info *mtd)
 139 +{
 140 +       struct mtd_partition tpart;
 141 +       struct mtd_part *part;
 142 +       char *name;
 143 +       //int index = 0;
 144 +       int offset, size;
 145 +       int ret;
 146 +
 147 +       part = PART(mtd);
 148 +
 149 +       /* check for the new squashfs offset first */
 150 +       ret = split_squashfs(part->master, part->offset, &offset);
 151 +       if (ret)
 152 +               return ret;
 153 +
 154 +       if ((offset > 0) && !mtd->split) {
 155 +               printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
 156 +               /* if we don't have a rootfs split partition, create a new one */
 157 +               tpart.name = (char *) mtd->name;
 158 +               tpart.size = mtd->size;
 159 +               tpart.offset = part->offset;
 160 +
 161 +               return split_rootfs_data(part->master, &part->mtd, &tpart);
 162 +       } else if ((offset > 0) && mtd->split) {
 163 +               /* update the offsets of the existing partition */
 164 +               size = mtd->size + part->offset - offset;
 165 +
 166 +               part = PART(mtd->split);
 167 +               part->offset = offset;
 168 +               part->mtd.size = size;
 169 +               printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
 170 +                       __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
 171 +                       (u32) part->offset, (u32) part->mtd.size);
 172 +               name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 173 +               strcpy(name, ROOTFS_SPLIT_NAME);
 174 +               part->mtd.name = name;
 175 +       } else if ((offset <= 0) && mtd->split) {
 176 +               printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
 177 +
 178 +               /* mark existing partition as removed */
 179 +               part = PART(mtd->split);
 180 +               name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 181 +               strcpy(name, ROOTFS_REMOVED_NAME);
 182 +               part->mtd.name = name;
 183 +               part->offset = 0;
 184 +               part->mtd.size = 0;
 185 +       }
 186 +
 187 +       return 0;
 188 +}
 189 +#endif /* CONFIG_MTD_ROOTFS_SPLIT */
 190 +
 191  /*
 192   * This function, given a master MTD object and a partition table, creates
 193   * and registers slave MTD objects which are bound to the master according to
 194 @@ -651,7 +800,7 @@ int add_mtd_partitions(struct mtd_info *
 195  {
 196         struct mtd_part *slave;
 197         uint64_t cur_offset = 0;
 198 -       int i;
 199 +       int i, ret;
 200
 201         printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 202
 203 @@ -666,6 +815,21 @@ int add_mtd_partitions(struct mtd_info *
 204
 205                 add_mtd_device(&slave->mtd);
 206
 207 +               if (!strcmp(parts[i].name, "rootfs")) {
 208 +#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
 209 +                       if (ROOT_DEV == 0) {
 210 +                               printk(KERN_NOTICE "mtd: partition \"rootfs\" "
 211 +                                       "set to be root filesystem\n");
 212 +                               ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
 213 +                       }
 214 +#endif
 215 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 216 +                       ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
 217 +                       /* if (ret == 0)
 218 +                        *      j++; */
 219 +#endif
 220 +               }
 221 +
 222                 cur_offset = slave->offset + slave->mtd.size;
 223         }
 224
 225 @@ -673,6 +837,32 @@ int add_mtd_partitions(struct mtd_info *
 226  }
 227  EXPORT_SYMBOL(add_mtd_partitions);
 228
 229 +int refresh_mtd_partitions(struct mtd_info *mtd)
 230 +{
 231 +       int ret = 0;
 232 +
 233 +       if (IS_PART(mtd)) {
 234 +               struct mtd_part *part;
 235 +               struct mtd_info *master;
 236 +
 237 +               part = PART(mtd);
 238 +               master = part->master;
 239 +               if (master->refresh_device)
 240 +                       ret = master->refresh_device(master);
 241 +       }
 242 +
 243 +       if (!ret && mtd->refresh_device)
 244 +               ret = mtd->refresh_device(mtd);
 245 +
 246 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 247 +       if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
 248 +               refresh_rootfs_split(mtd);
 249 +#endif
 250 +
 251 +       return 0;
 252 +}
 253 +EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
 254 +
 255  static DEFINE_SPINLOCK(part_parser_lock);
 256  static LIST_HEAD(part_parsers);
 257
 258 --- a/drivers/mtd/devices/block2mtd.c
 259 +++ b/drivers/mtd/devices/block2mtd.c
 260 @@ -30,6 +30,8 @@ struct block2mtd_dev {
 261         struct block_device *blkdev;
 262         struct mtd_info mtd;
 263         struct mutex write_mutex;
 264 +       rwlock_t bdev_mutex;
 265 +       char devname[0];
 266  };
 267
 268
 269 @@ -82,6 +84,12 @@ static int block2mtd_erase(struct mtd_in
 270         size_t len = instr->len;
 271         int err;
 272
 273 +       read_lock(&dev->bdev_mutex);
 274 +       if (!dev->blkdev) {
 275 +               err = -EINVAL;
 276 +               goto done;
 277 +       }
 278 +
 279         instr->state = MTD_ERASING;
 280         mutex_lock(&dev->write_mutex);
 281         err = _block2mtd_erase(dev, from, len);
 282 @@ -93,6 +101,10 @@ static int block2mtd_erase(struct mtd_in
 283                 instr->state = MTD_ERASE_DONE;
 284
 285         mtd_erase_callback(instr);
 286 +
 287 +done:
 288 +       read_unlock(&dev->bdev_mutex);
 289 +
 290         return err;
 291  }
 292
 293 @@ -104,10 +116,14 @@ static int block2mtd_read(struct mtd_inf
 294         struct page *page;
 295         int index = from >> PAGE_SHIFT;
 296         int offset = from & (PAGE_SIZE-1);
 297 -       int cpylen;
 298 +       int cpylen, err = 0;
 299 +
 300 +       read_lock(&dev->bdev_mutex);
 301 +       if (!dev->blkdev || (from > mtd->size)) {
 302 +               err = -EINVAL;
 303 +               goto done;
 304 +       }
 305
 306 -       if (from > mtd->size)
 307 -               return -EINVAL;
 308         if (from + len > mtd->size)
 309                 len = mtd->size - from;
 310
 311 @@ -122,10 +138,14 @@ static int block2mtd_read(struct mtd_inf
 312                 len = len - cpylen;
 313
 314                 page = page_read(dev->blkdev->bd_inode->i_mapping, index);
 315 -               if (!page)
 316 -                       return -ENOMEM;
 317 -               if (IS_ERR(page))
 318 -                       return PTR_ERR(page);
 319 +               if (!page) {
 320 +                       err = -ENOMEM;
 321 +                       goto done;
 322 +               }
 323 +               if (IS_ERR(page)) {
 324 +                       err = PTR_ERR(page);
 325 +                       goto done;
 326 +               }
 327
 328                 memcpy(buf, page_address(page) + offset, cpylen);
 329                 page_cache_release(page);
 330 @@ -136,7 +156,10 @@ static int block2mtd_read(struct mtd_inf
 331                 offset = 0;
 332                 index++;
 333         }
 334 -       return 0;
 335 +
 336 +done:
 337 +       read_unlock(&dev->bdev_mutex);
 338 +       return err;
 339  }
 340
 341
 342 @@ -188,12 +211,22 @@ static int block2mtd_write(struct mtd_in
 343                 size_t *retlen, const u_char *buf)
 344  {
 345         struct block2mtd_dev *dev = mtd->priv;
 346 -       int err;
 347 +       int err = 0;
 348 +
 349 +       read_lock(&dev->bdev_mutex);
 350 +       if (!dev->blkdev) {
 351 +               err = -EINVAL;
 352 +               goto done;
 353 +       }
 354
 355         if (!len)
 356 -               return 0;
 357 -       if (to >= mtd->size)
 358 -               return -ENOSPC;
 359 +               goto done;
 360 +
 361 +       if (to >= mtd->size) {
 362 +               err = -ENOSPC;
 363 +               goto done;
 364 +       }
 365 +
 366         if (to + len > mtd->size)
 367                 len = mtd->size - to;
 368
 369 @@ -202,6 +235,9 @@ static int block2mtd_write(struct mtd_in
 370         mutex_unlock(&dev->write_mutex);
 371         if (err > 0)
 372                 err = 0;
 373 +
 374 +done:
 375 +       read_unlock(&dev->bdev_mutex);
 376         return err;
 377  }
 378
 379 @@ -210,33 +246,109 @@ static int block2mtd_write(struct mtd_in
 380  static void block2mtd_sync(struct mtd_info *mtd)
 381  {
 382         struct block2mtd_dev *dev = mtd->priv;
 383 +       read_lock(&dev->bdev_mutex);
 384 +       if (dev->blkdev)
 385         sync_blockdev(dev->blkdev);
 386 +       read_unlock(&dev->bdev_mutex);
 387 +
 388         return;
 389  }
 390
 391
 392 +static int _open_bdev(struct block2mtd_dev *dev)
 393 +{
 394 +       const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
 395 +       struct block_device *bdev;
 396 +
 397 +       /* Get a handle on the device */
 398 +       bdev = blkdev_get_by_path(dev->devname, mode, dev);
 399 +#ifndef MODULE
 400 +       if (IS_ERR(bdev)) {
 401 +
 402 +               /* We might not have rootfs mounted at this point. Try
 403 +                  to resolve the device name by other means. */
 404 +
 405 +               dev_t devt = name_to_dev_t(dev->devname);
 406 +               if (devt)
 407 +                       bdev = blkdev_get_by_dev(devt, mode, dev);
 408 +       }
 409 +#endif
 410 +
 411 +       if (IS_ERR(bdev)) {
 412 +               ERROR("error: cannot open device %s", dev->devname);
 413 +               return 1;
 414 +       }
 415 +       dev->blkdev = bdev;
 416 +
 417 +       if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
 418 +               ERROR("attempting to use an MTD device as a block device");
 419 +               return 1;
 420 +       }
 421 +
 422 +       return 0;
 423 +}
 424 +
 425 +static void _close_bdev(struct block2mtd_dev *dev)
 426 +{
 427 +       struct block_device *bdev;
 428 +
 429 +       if (!dev->blkdev)
 430 +               return;
 431 +
 432 +       bdev = dev->blkdev;
 433 +       invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, 0, -1);
 434 +       blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 435 +       dev->blkdev = NULL;
 436 +}
 437 +
 438  static void block2mtd_free_device(struct block2mtd_dev *dev)
 439  {
 440         if (!dev)
 441                 return;
 442
 443         kfree(dev->mtd.name);
 444 -
 445 -       if (dev->blkdev) {
 446 -               invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
 447 -                                       0, -1);
 448 -               blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 449 -       }
 450 -
 451 +       _close_bdev(dev);
 452         kfree(dev);
 453  }
 454
 455
 456 -/* FIXME: ensure that mtd->size % erase_size == 0 */
 457 -static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
 458 +static int block2mtd_refresh(struct mtd_info *mtd)
 459  {
 460 -       const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
 461 +       struct block2mtd_dev *dev = mtd->priv;
 462         struct block_device *bdev;
 463 +       dev_t devt;
 464 +       int err = 0;
 465 +
 466 +       /* no other mtd function can run at this point */
 467 +       write_lock(&dev->bdev_mutex);
 468 +
 469 +       /* get the device number for the whole disk */
 470 +       devt = MKDEV(MAJOR(dev->blkdev->bd_dev), 0);
 471 +
 472 +       /* close the old block device */
 473 +       _close_bdev(dev);
 474 +
 475 +       /* open the whole disk, issue a partition rescan, then */
 476 +       bdev = blkdev_get_by_dev(devt, FMODE_WRITE | FMODE_READ);
 477 +       if (!bdev || !bdev->bd_disk)
 478 +               err = -EINVAL;
 479 +#ifndef CONFIG_MTD_BLOCK2MTD_MODULE
 480 +       else
 481 +               err = rescan_partitions(bdev->bd_disk, bdev);
 482 +#endif
 483 +       if (bdev)
 484 +               blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 485 +
 486 +       /* try to open the partition block device again */
 487 +       _open_bdev(dev);
 488 +       write_unlock(&dev->bdev_mutex);
 489 +
 490 +       return err;
 491 +}
 492 +
 493 +/* FIXME: ensure that mtd->size % erase_size == 0 */
 494 +static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
 495 +{
 496         struct block2mtd_dev *dev;
 497         struct mtd_partition *part;
 498         char *name;
 499 @@ -244,36 +356,17 @@ static struct block2mtd_dev *add_device(
 500         if (!devname)
 501                 return NULL;
 502
 503 -       dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
 504 +       dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL);
 505         if (!dev)
 506                 return NULL;
 507
 508 -       /* Get a handle on the device */
 509 -       bdev = blkdev_get_by_path(devname, mode, dev);
 510 -#ifndef MODULE
 511 -       if (IS_ERR(bdev)) {
 512 -
 513 -               /* We might not have rootfs mounted at this point. Try
 514 -                  to resolve the device name by other means. */
 515 +       strcpy(dev->devname, devname);
 516
 517 -               dev_t devt = name_to_dev_t(devname);
 518 -               if (devt)
 519 -                       bdev = blkdev_get_by_dev(devt, mode, dev);
 520 -       }
 521 -#endif
 522 -
 523 -       if (IS_ERR(bdev)) {
 524 -               ERROR("error: cannot open device %s", devname);
 525 +       if (_open_bdev(dev))
 526                 goto devinit_err;
 527 -       }
 528 -       dev->blkdev = bdev;
 529 -
 530 -       if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
 531 -               ERROR("attempting to use an MTD device as a block device");
 532 -               goto devinit_err;
 533 -       }
 534
 535         mutex_init(&dev->write_mutex);
 536 +       rwlock_init(&dev->bdev_mutex);
 537
 538         /* Setup the MTD structure */
 539         /* make the name contain the block device in */
 540 @@ -298,6 +391,7 @@ static struct block2mtd_dev *add_device(
 541         dev->mtd.read = block2mtd_read;
 542         dev->mtd.priv = dev;
 543         dev->mtd.owner = THIS_MODULE;
 544 +       dev->mtd.refresh_device = block2mtd_refresh;
 545
 546         part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
 547         part->name = dev->mtd.name;
 548 --- a/drivers/mtd/mtdchar.c
 549 +++ b/drivers/mtd/mtdchar.c
 550 @@ -841,6 +841,13 @@ static int mtd_ioctl(struct file *file,
 551                 file->f_pos = 0;
 552                 break;
 553         }
 554 +#ifdef CONFIG_MTD_PARTITIONS
 555 +       case MTDREFRESH:
 556 +       {
 557 +               ret = refresh_mtd_partitions(mtd);
 558 +               break;
 559 +       }
 560 +#endif
 561
 562         case OTPGETREGIONCOUNT:
 563         case OTPGETREGIONINFO:
 564 --- a/include/linux/mtd/mtd.h
 565 +++ b/include/linux/mtd/mtd.h
 566 @@ -125,6 +125,7 @@ struct nand_ecclayout {
 567         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 568  };
 569
 570 +struct mtd_info;
 571  struct mtd_info {
 572         u_char type;
 573         uint32_t flags;
 574 @@ -277,6 +278,9 @@ struct mtd_info {
 575         struct device dev;
 576         int usecount;
 577
 578 +       int (*refresh_device)(struct mtd_info *mtd);
 579 +       struct mtd_info *split;
 580 +
 581         /* If the driver is something smart, like UBI, it may need to maintain
 582          * its own reference counting. The below functions are only for driver.
 583          * The driver may register its callbacks. These callbacks are not
 584 --- a/include/linux/mtd/partitions.h
 585 +++ b/include/linux/mtd/partitions.h
 586 @@ -34,12 +34,14 @@
 587   * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
 588   */
 589
 590 +struct mtd_partition;
 591  struct mtd_partition {
 592         char *name;                     /* identifier string */
 593         uint64_t size;                  /* partition size */
 594         uint64_t offset;                /* offset within the master MTD space */
 595         uint32_t mask_flags;            /* master MTD flags to mask out for this partition */
 596         struct nand_ecclayout *ecclayout;       /* out of band layout for this partition (NAND only) */
 597 +       int (*refresh_partition)(struct mtd_info *);
 598  };
 599
 600  #define MTDPART_OFS_NXTBLK     (-2)
 601 @@ -51,6 +53,7 @@ struct mtd_info;
 602
 603  int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
 604  int del_mtd_partitions(struct mtd_info *);
 605 +int refresh_mtd_partitions(struct mtd_info *);
 606
 607  /*
 608   * Functions dealing with the various ways of partitioning the space
 609 --- a/include/mtd/mtd-abi.h
 610 +++ b/include/mtd/mtd-abi.h
 611 @@ -127,6 +127,7 @@ struct otp_info {
 612  #define MEMWRITEOOB64          _IOWR('M', 21, struct mtd_oob_buf64)
 613  #define MEMREADOOB64           _IOWR('M', 22, struct mtd_oob_buf64)
 614  #define MEMISLOCKED            _IOR('M', 23, struct erase_info_user)
 615 +#define MTDREFRESH             _IO('M', 23)
 616
 617  /*
 618   * Obsolete legacy interface. Keep it in order not to break userspace