target/linux/generic/patches-2.6.37/065-rootfs_split.patch

   1 --- a/drivers/mtd/Kconfig
   2 +++ b/drivers/mtd/Kconfig
   3 @@ -53,6 +53,16 @@ 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 @@ -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 @@ -618,6 +620,164 @@ 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 split_offset = 0;
  96 +       int ret;
  97 +
  98 +       ret = split_squashfs(master, part->offset, &split_offset);
  99 +       if (ret)
 100 +               return ret;
 101 +
 102 +       if (split_offset <= 0)
 103 +               return 0;
 104 +
 105 +       dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
 106 +       if (dpart == NULL) {
 107 +               printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
 108 +                       ROOTFS_SPLIT_NAME);
 109 +               return -ENOMEM;
 110 +       }
 111 +
 112 +       memcpy(dpart, part, sizeof(*part));
 113 +       dpart->name = (unsigned char *)&dpart[1];
 114 +       strcpy(dpart->name, ROOTFS_SPLIT_NAME);
 115 +
 116 +       dpart->size -= split_offset - dpart->offset;
 117 +       dpart->offset = split_offset;
 118 +
 119 +       if (dpart == NULL)
 120 +               return 1;
 121 +
 122 +       printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
 123 +               ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
 124 +
 125 +       slave = add_one_partition(master, dpart, 0, split_offset);
 126 +       if (!slave) {
 127 +               kfree(dpart);
 128 +               return -ENOMEM;
 129 +       }
 130 +       if (!strcmp(parts[i].name, "rootfs")) {
 131 +#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
 132 +               if (ROOT_DEV == 0) {
 133 +                       printk(KERN_NOTICE "mtd: partition \"rootfs\" "
 134 +                               "set to be root filesystem\n");
 135 +                       ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
 136 +               }
 137 +#endif
 138 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 139 +       ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
 140 +       /* if (ret == 0)
 141 +        *      j++; */
 142 +#endif
 143 +       }
 144 +       rpart->split = &slave->mtd;
 145 +
 146 +       return 0;
 147 +}
 148 +
 149 +static int refresh_rootfs_split(struct mtd_info *mtd)
 150 +{
 151 +       struct mtd_partition tpart;
 152 +       struct mtd_part *part;
 153 +       char *name;
 154 +       //int index = 0;
 155 +       int offset, size;
 156 +       int ret;
 157 +
 158 +       part = PART(mtd);
 159 +
 160 +       /* check for the new squashfs offset first */
 161 +       ret = split_squashfs(part->master, part->offset, &offset);
 162 +       if (ret)
 163 +               return ret;
 164 +
 165 +       if ((offset > 0) && !mtd->split) {
 166 +               printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
 167 +               /* if we don't have a rootfs split partition, create a new one */
 168 +               tpart.name = (char *) mtd->name;
 169 +               tpart.size = mtd->size;
 170 +               tpart.offset = part->offset;
 171 +
 172 +               return split_rootfs_data(part->master, &part->mtd, &tpart);
 173 +       } else if ((offset > 0) && mtd->split) {
 174 +               /* update the offsets of the existing partition */
 175 +               size = mtd->size + part->offset - offset;
 176 +
 177 +               part = PART(mtd->split);
 178 +               part->offset = offset;
 179 +               part->mtd.size = size;
 180 +               printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
 181 +                       __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
 182 +                       (u32) part->offset, (u32) part->mtd.size);
 183 +               name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 184 +               strcpy(name, ROOTFS_SPLIT_NAME);
 185 +               part->mtd.name = name;
 186 +       } else if ((offset <= 0) && mtd->split) {
 187 +               printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
 188 +
 189 +               /* mark existing partition as removed */
 190 +               part = PART(mtd->split);
 191 +               name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 192 +               strcpy(name, ROOTFS_REMOVED_NAME);
 193 +               part->mtd.name = name;
 194 +               part->offset = 0;
 195 +               part->mtd.size = 0;
 196 +       }
 197 +
 198 +       return 0;
 199 +}
 200 +#endif /* CONFIG_MTD_ROOTFS_SPLIT */
 201 +
 202  /*
 203   * This function, given a master MTD object and a partition table, creates
 204   * and registers slave MTD objects which are bound to the master according to
 205 @@ -633,7 +793,7 @@ int add_mtd_partitions(struct mtd_info *
 206  {
 207         struct mtd_part *slave;
 208         uint64_t cur_offset = 0;
 209 -       int i;
 210 +       int i, ret;
 211
 212         printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 213
 214 @@ -655,6 +815,32 @@ int add_mtd_partitions(struct mtd_info *
 215  }
 216  EXPORT_SYMBOL(add_mtd_partitions);
 217
 218 +int refresh_mtd_partitions(struct mtd_info *mtd)
 219 +{
 220 +       int ret = 0;
 221 +
 222 +       if (IS_PART(mtd)) {
 223 +               struct mtd_part *part;
 224 +               struct mtd_info *master;
 225 +
 226 +               part = PART(mtd);
 227 +               master = part->master;
 228 +               if (master->refresh_device)
 229 +                       ret = master->refresh_device(master);
 230 +       }
 231 +
 232 +       if (!ret && mtd->refresh_device)
 233 +               ret = mtd->refresh_device(mtd);
 234 +
 235 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 236 +       if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
 237 +               refresh_rootfs_split(mtd);
 238 +#endif
 239 +
 240 +       return 0;
 241 +}
 242 +EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
 243 +
 244  static DEFINE_SPINLOCK(part_parser_lock);
 245  static LIST_HEAD(part_parsers);
 246
 247 --- a/drivers/mtd/devices/block2mtd.c
 248 +++ b/drivers/mtd/devices/block2mtd.c
 249 @@ -30,6 +30,8 @@ struct block2mtd_dev {
 250         struct block_device *blkdev;
 251         struct mtd_info mtd;
 252         struct mutex write_mutex;
 253 +       rwlock_t bdev_mutex;
 254 +       char devname[0];
 255  };
 256
 257
 258 @@ -82,6 +84,12 @@ static int block2mtd_erase(struct mtd_in
 259         size_t len = instr->len;
 260         int err;
 261
 262 +       read_lock(&dev->bdev_mutex);
 263 +       if (!dev->blkdev) {
 264 +               err = -EINVAL;
 265 +               goto done;
 266 +       }
 267 +
 268         instr->state = MTD_ERASING;
 269         mutex_lock(&dev->write_mutex);
 270         err = _block2mtd_erase(dev, from, len);
 271 @@ -93,6 +101,10 @@ static int block2mtd_erase(struct mtd_in
 272                 instr->state = MTD_ERASE_DONE;
 273
 274         mtd_erase_callback(instr);
 275 +
 276 +done:
 277 +       read_unlock(&dev->bdev_mutex);
 278 +
 279         return err;
 280  }
 281
 282 @@ -104,10 +116,14 @@ static int block2mtd_read(struct mtd_inf
 283         struct page *page;
 284         int index = from >> PAGE_SHIFT;
 285         int offset = from & (PAGE_SIZE-1);
 286 -       int cpylen;
 287 +       int cpylen, err = 0;
 288 +
 289 +       read_lock(&dev->bdev_mutex);
 290 +       if (!dev->blkdev || (from > mtd->size)) {
 291 +               err = -EINVAL;
 292 +               goto done;
 293 +       }
 294
 295 -       if (from > mtd->size)
 296 -               return -EINVAL;
 297         if (from + len > mtd->size)
 298                 len = mtd->size - from;
 299
 300 @@ -122,10 +138,14 @@ static int block2mtd_read(struct mtd_inf
 301                 len = len - cpylen;
 302
 303                 page = page_read(dev->blkdev->bd_inode->i_mapping, index);
 304 -               if (!page)
 305 -                       return -ENOMEM;
 306 -               if (IS_ERR(page))
 307 -                       return PTR_ERR(page);
 308 +               if (!page) {
 309 +                       err = -ENOMEM;
 310 +                       goto done;
 311 +               }
 312 +               if (IS_ERR(page)) {
 313 +                       err = PTR_ERR(page);
 314 +                       goto done;
 315 +               }
 316
 317                 memcpy(buf, page_address(page) + offset, cpylen);
 318                 page_cache_release(page);
 319 @@ -136,7 +156,10 @@ static int block2mtd_read(struct mtd_inf
 320                 offset = 0;
 321                 index++;
 322         }
 323 -       return 0;
 324 +
 325 +done:
 326 +       read_unlock(&dev->bdev_mutex);
 327 +       return err;
 328  }
 329
 330
 331 @@ -188,12 +211,22 @@ static int block2mtd_write(struct mtd_in
 332                 size_t *retlen, const u_char *buf)
 333  {
 334         struct block2mtd_dev *dev = mtd->priv;
 335 -       int err;
 336 +       int err = 0;
 337 +
 338 +       read_lock(&dev->bdev_mutex);
 339 +       if (!dev->blkdev) {
 340 +               err = -EINVAL;
 341 +               goto done;
 342 +       }
 343
 344         if (!len)
 345 -               return 0;
 346 -       if (to >= mtd->size)
 347 -               return -ENOSPC;
 348 +               goto done;
 349 +
 350 +       if (to >= mtd->size) {
 351 +               err = -ENOSPC;
 352 +               goto done;
 353 +       }
 354 +
 355         if (to + len > mtd->size)
 356                 len = mtd->size - to;
 357
 358 @@ -202,6 +235,9 @@ static int block2mtd_write(struct mtd_in
 359         mutex_unlock(&dev->write_mutex);
 360         if (err > 0)
 361                 err = 0;
 362 +
 363 +done:
 364 +       read_unlock(&dev->bdev_mutex);
 365         return err;
 366  }
 367
 368 @@ -210,52 +246,29 @@ static int block2mtd_write(struct mtd_in
 369  static void block2mtd_sync(struct mtd_info *mtd)
 370  {
 371         struct block2mtd_dev *dev = mtd->priv;
 372 -       sync_blockdev(dev->blkdev);
 373 -       return;
 374 -}
 375 -
 376 -
 377 -static void block2mtd_free_device(struct block2mtd_dev *dev)
 378 -{
 379 -       if (!dev)
 380 -               return;
 381 -
 382 -       kfree(dev->mtd.name);
 383
 384 -       if (dev->blkdev) {
 385 -               invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
 386 -                                       0, -1);
 387 -               close_bdev_exclusive(dev->blkdev, FMODE_READ|FMODE_WRITE);
 388 -       }
 389 +       read_lock(&dev->bdev_mutex);
 390 +       if (dev->blkdev)
 391 +               sync_blockdev(dev->blkdev);
 392 +       read_unlock(&dev->bdev_mutex);
 393
 394 -       kfree(dev);
 395 +       return;
 396  }
 397
 398
 399 -/* FIXME: ensure that mtd->size % erase_size == 0 */
 400 -static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
 401 +static int _open_bdev(struct block2mtd_dev *dev)
 402  {
 403         struct block_device *bdev;
 404 -       struct block2mtd_dev *dev;
 405 -       struct mtd_partition *part;
 406 -       char *name;
 407 -
 408 -       if (!devname)
 409 -               return NULL;
 410 -
 411 -       dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
 412 -       if (!dev)
 413 -               return NULL;
 414
 415         /* Get a handle on the device */
 416 -       bdev = open_bdev_exclusive(devname, FMODE_READ|FMODE_WRITE, NULL);
 417 +       bdev = open_bdev_exclusive(dev->devname, FMODE_READ|FMODE_WRITE, NULL);
 418  #ifndef MODULE
 419         if (IS_ERR(bdev)) {
 420
 421                 /* We might not have rootfs mounted at this point. Try
 422                    to resolve the device name by other means. */
 423
 424 -               dev_t devt = name_to_dev_t(devname);
 425 +               dev_t devt = name_to_dev_t(dev->devname);
 426                 if (devt) {
 427                         bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
 428                 }
 429 @@ -263,17 +276,98 @@ static struct block2mtd_dev *add_device(
 430  #endif
 431
 432         if (IS_ERR(bdev)) {
 433 -               ERROR("error: cannot open device %s", devname);
 434 -               goto devinit_err;
 435 +               ERROR("error: cannot open device %s", dev->devname);
 436 +               return 1;
 437         }
 438         dev->blkdev = bdev;
 439
 440         if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
 441                 ERROR("attempting to use an MTD device as a block device");
 442 -               goto devinit_err;
 443 +               return 1;
 444         }
 445
 446 +       return 0;
 447 +}
 448 +
 449 +static void _close_bdev(struct block2mtd_dev *dev)
 450 +{
 451 +       struct block_device *bdev;
 452 +
 453 +       if (!dev->blkdev)
 454 +               return;
 455 +
 456 +       bdev = dev->blkdev;
 457 +       invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, 0, -1);
 458 +       close_bdev_exclusive(dev->blkdev, FMODE_READ|FMODE_WRITE);
 459 +       dev->blkdev = NULL;
 460 +}
 461 +
 462 +static void block2mtd_free_device(struct block2mtd_dev *dev)
 463 +{
 464 +       if (!dev)
 465 +               return;
 466 +
 467 +       kfree(dev->mtd.name);
 468 +       _close_bdev(dev);
 469 +       kfree(dev);
 470 +}
 471 +
 472 +
 473 +static int block2mtd_refresh(struct mtd_info *mtd)
 474 +{
 475 +       struct block2mtd_dev *dev = mtd->priv;
 476 +       struct block_device *bdev;
 477 +       dev_t devt;
 478 +       int err = 0;
 479 +
 480 +       /* no other mtd function can run at this point */
 481 +       write_lock(&dev->bdev_mutex);
 482 +
 483 +       /* get the device number for the whole disk */
 484 +       devt = MKDEV(MAJOR(dev->blkdev->bd_dev), 0);
 485 +
 486 +       /* close the old block device */
 487 +       _close_bdev(dev);
 488 +
 489 +       /* open the whole disk, issue a partition rescan, then */
 490 +       bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
 491 +       if (!bdev || !bdev->bd_disk)
 492 +               err = -EINVAL;
 493 +#ifndef CONFIG_MTD_BLOCK2MTD_MODULE
 494 +       else
 495 +               err = rescan_partitions(bdev->bd_disk, bdev);
 496 +#endif
 497 +       if (bdev)
 498 +               close_bdev_exclusive(bdev, FMODE_READ|FMODE_WRITE);
 499 +
 500 +       /* try to open the partition block device again */
 501 +       _open_bdev(dev);
 502 +       write_unlock(&dev->bdev_mutex);
 503 +
 504 +       return err;
 505 +}
 506 +
 507 +/* FIXME: ensure that mtd->size % erase_size == 0 */
 508 +static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
 509 +{
 510 +       struct block2mtd_dev *dev;
 511 +       struct mtd_partition *part;
 512 +       char *name;
 513 +
 514 +       if (!devname)
 515 +               return NULL;
 516 +
 517 +       dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL);
 518 +       if (!dev)
 519 +               return NULL;
 520 +
 521 +       strcpy(dev->devname, devname);
 522 +
 523 +       if (_open_bdev(dev))
 524 +               goto devinit_err;
 525 +
 526         mutex_init(&dev->write_mutex);
 527 +       rwlock_init(&dev->bdev_mutex);
 528
 529         /* Setup the MTD structure */
 530         /* make the name contain the block device in */
 531 @@ -298,6 +392,7 @@ static struct block2mtd_dev *add_device(
 532         dev->mtd.read = block2mtd_read;
 533         dev->mtd.priv = dev;
 534         dev->mtd.owner = THIS_MODULE;
 535 +       dev->mtd.refresh_device = block2mtd_refresh;
 536
 537         part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
 538         part->name = dev->mtd.name;
 539 --- a/drivers/mtd/mtdchar.c
 540 +++ b/drivers/mtd/mtdchar.c
 541 @@ -841,6 +841,13 @@ static int mtd_ioctl(struct file *file,
 542                 file->f_pos = 0;
 543                 break;
 544         }
 545 +#ifdef CONFIG_MTD_PARTITIONS
 546 +       case MTDREFRESH:
 547 +       {
 548 +               ret = refresh_mtd_partitions(mtd);
 549 +               break;
 550 +       }
 551 +#endif
 552
 553         case OTPGETREGIONCOUNT:
 554         case OTPGETREGIONINFO:
 555 --- a/include/linux/mtd/mtd.h
 556 +++ b/include/linux/mtd/mtd.h
 557 @@ -125,6 +125,7 @@ struct nand_ecclayout {
 558         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 559  };
 560
 561 +struct mtd_info;
 562  struct mtd_info {
 563         u_char type;
 564         uint32_t flags;
 565 @@ -266,6 +267,9 @@ struct mtd_info {
 566         struct device dev;
 567         int usecount;
 568
 569 +       int (*refresh_device)(struct mtd_info *mtd);
 570 +       struct mtd_info *split;
 571 +
 572         /* If the driver is something smart, like UBI, it may need to maintain
 573          * its own reference counting. The below functions are only for driver.
 574          * The driver may register its callbacks. These callbacks are not
 575 --- a/include/linux/mtd/partitions.h
 576 +++ b/include/linux/mtd/partitions.h
 577 @@ -34,12 +34,14 @@
 578   * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
 579   */
 580
 581 +struct mtd_partition;
 582  struct mtd_partition {
 583         char *name;                     /* identifier string */
 584         uint64_t size;                  /* partition size */
 585         uint64_t offset;                /* offset within the master MTD space */
 586         uint32_t mask_flags;            /* master MTD flags to mask out for this partition */
 587         struct nand_ecclayout *ecclayout;       /* out of band layout for this partition (NAND only) */
 588 +       int (*refresh_partition)(struct mtd_info *);
 589  };
 590
 591  #define MTDPART_OFS_NXTBLK     (-2)
 592 @@ -51,6 +53,7 @@ struct mtd_info;
 593
 594  int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
 595  int del_mtd_partitions(struct mtd_info *);
 596 +int refresh_mtd_partitions(struct mtd_info *);
 597
 598  /*
 599   * Functions dealing with the various ways of partitioning the space
 600 --- a/include/mtd/mtd-abi.h
 601 +++ b/include/mtd/mtd-abi.h
 602 @@ -127,6 +127,7 @@ struct otp_info {
 603  #define MEMWRITEOOB64          _IOWR('M', 21, struct mtd_oob_buf64)
 604  #define MEMREADOOB64           _IOWR('M', 22, struct mtd_oob_buf64)
 605  #define MEMISLOCKED            _IOR('M', 23, struct erase_info_user)
 606 +#define MTDREFRESH             _IO('M', 23)
 607
 608  /*
 609   * Obsolete legacy interface. Keep it in order not to break userspace