Function ramdisk_register

drivers/misc/ramdisk.c:421–467

 ****************************************************************************/

int ramdisk_register(int minor, FAR uint8_t *buffer, uint32_t nsectors,
                     uint16_t sectsize, uint8_t rdflags)
{
  FAR struct rd_struct_s *dev;
  char devname[16];
  int ret = -ENOMEM;

  finfo("buffer: %p nsectors: %" PRIu32 " sectsize: %" PRIu16 "\n",
        buffer, nsectors, sectsize);

  /* Sanity check */

#ifdef CONFIG_DEBUG_FEATURES
  if (minor < 0 || minor > 255 || !buffer || !nsectors || !sectsize)
    {
      return -EINVAL;
    }
#endif

  /* Allocate a ramdisk device structure */

  dev = kmm_zalloc(sizeof(struct rd_struct_s));
  if (dev)
    {
      /* Initialize the ramdisk device structure */

      dev->rd_nsectors     = nsectors;     /* Number of sectors on device */
      dev->rd_sectsize     = sectsize;     /* The size of one sector */
      dev->rd_buffer       = buffer;       /* RAM disk backup memory */
      dev->rd_flags        = rdflags & RDFLAG_USER;

      /* Create a ramdisk device name */

      snprintf(devname, sizeof(devname), "/dev/ram%d", minor);

      /* Inode private data is a reference to the ramdisk device structure */

      ret = register_blockdriver(devname, &g_bops, 0, dev);
      if (ret < 0)
        {
          ferr("register_blockdriver failed: %d\n", -ret);
          kmm_free(dev);
        }
    }

  return ret;
}