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static int mtdblock_ioctl(struct inode * inode, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct mtdblk_dev *mtdblk;
mtdblk = mtdblks[minor(inode->i_rdev)];
switch (cmd) {
case BLKGETSIZE: /* Return device size */
return put_user((mtdblk->mtd->size >> 9), (unsigned long *) arg);
case BLKFLSBUF:
if(!capable(CAP_SYS_ADMIN))
return -EACCES;
fsync_dev(inode->i_rdev);
invalidate_buffers(inode->i_rdev);
down(&mtdblk->cache_sem);
write_cached_data(mtdblk);
up(&mtdblk->cache_sem);
if (mtdblk->mtd->sync)
mtdblk->mtd->sync(mtdblk->mtd);
return 0;
default:
return -EINVAL;
}
}
static struct block_device_operations mtd_fops =
{
owner: THIS_MODULE,
open: mtdblock_open,
release: mtdblock_release,
ioctl: mtdblock_ioctl
};
static void mtd_notify_add(struct mtd_info* mtd)
{
…
}
static void mtd_notify_remove(struct mtd_info* mtd)
{
if (!mtd || mtd->type == MTD_ABSENT)
return;
devfs_unregister(devfs_rw_handle[mtd->index]);
}
int __init init_mtdblock(void)
{
int i;
spin_lock_init(&mtdblks_lock);
/* this lock is used just in kernels >= 2.5.x */
spin_lock_init(&mtdblock_lock);
#ifdef CONFIG_DEVFS_FS
if (devfs_register_blkdev(MTD_BLOCK_MAJOR, DEVICE_NAME, &mtd_fops))
{
printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
MTD_BLOCK_MAJOR);
return -EAGAIN;
}
devfs_dir_handle = devfs_mk_dir(NULL, DEVICE_NAME, NULL);
register_mtd_user(¬ifier);
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