static release_t mtdblock_release(struct inode *inode, struct file *file)
{
int dev;
struct mtd_info *mtd;
DEBUG(1, "mtdblock_release\n");
if (inode == NULL)
release_return(-ENODEV);
dev = MINOR(inode->i_rdev);
mtd = __get_mtd_device(NULL, dev);
if (!mtd) {
printk(KERN_WARNING "MTD device is absent on mtd_release!\n");
BLK_DEC_USE_COUNT;
release_return(-ENODEV);
}
if (mtd->sync)
mtd->sync(mtd);
put_mtd_device(mtd);
DEBUG(1, "ok\n");
BLK_DEC_USE_COUNT;
release_return(0);
}
static int mtdblock_ioctl(struct inode * inode, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct mtd_info *mtd;
mtd = __get_mtd_device(NULL, MINOR(inode->i_rdev));
if (!mtd) return -EINVAL;
switch (cmd) {
case BLKGETSIZE: /* Return device size */
return put_user((mtd->size >> 9), (unsigned long *) arg);
#ifdef BLKGETSIZE64
case BLKGETSIZE64:
return put_user((u64)mtd->size, (u64 *)arg);
#endif
case BLKFLSBUF:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
if(!capable(CAP_SYS_ADMIN)) return -EACCES;
#endif
fsync_dev(inode->i_rdev);
invalidate_buffers(inode->i_rdev);
if (mtd->sync)
mtd->sync(mtd);
return 0;
default:
return -ENOTTY;
}
}
static int
mtdblock_romptr(kdev_t dev, struct vm_area_struct * vma)
{
struct mtd_info *mtd;
u_char *ptr;
size_t len;
mtd = __get_mtd_device(NULL, MINOR(dev));
if (!mtd->point)
return -ENOSYS; /* Can't do it, No function to point to correct addr */
if ((*mtd->point)(mtd,vma->vm_offset,vma->vm_end-vma->vm_start,&len,&ptr) != 0)
return -ENOSYS;
vma->vm_start = (unsigned long) ptr;
vma->vm_end = vma->vm_start + len;
return 0;
}
static void mtdblock_request(RQFUNC_ARG)
{
struct request *current_request;
unsigned int res = 0;
struct mtd_info *mtd;
while (1)
{
/* Grab the Request and unlink it from the request list, INIT_REQUEST
will execute a return if we are done. */
INIT_REQUEST;
current_request = CURRENT;
if (MINOR(current_request->rq_dev) >= MAX_MTD_DEVICES)
{
printk("mtd: Unsupported device!\n");
end_request(0);
continue;
}
// Grab our MTD structure
mtd = __get_mtd_device(NULL, MINOR(current_request->rq_dev));
if (!mtd) {
printk("MTD device %d doesn't appear to exist any more\n", CURRENT_DEV);
end_request(0);
}
if (current_request->sector << 9 > mtd->size ||
(current_request->sector + current_request->current_nr_sectors) << 9 > mtd->size)
{
printk("mtd: Attempt to read past end of device!\n");
printk("size: %x, sector: %lx, nr_sectors %lx\n", mtd->size,
current_request->sector, current_request->current_nr_sectors);
end_request(0);
continue;
}
/* Remove the request we are handling from the request list so nobody messes
with it */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
/* Now drop the lock that the ll_rw_blk functions grabbed for us
and process the request. This is necessary due to the extreme time
we spend processing it. */
spin_unlock_irq(&io_request_lock);
#endif
// Handle the request
switch (current_request->cmd)
{
size_t retlen;
case READ:
if (MTD_READ(mtd,current_request->sector<<9,
current_request->current_nr_sectors << 9,
&retlen, current_request->buffer) == 0)
res = 1;
else
res = 0;
break;
case WRITE:
/* printk("mtdblock_request WRITE sector=%d(%d)\n",current_request->sector,
current_request->current_nr_sectors);
*/
// Read only device
if ((mtd->flags & MTD_CAP_RAM) == 0)
{
res = 0;
break;
}
// Do the write
if (MTD_WRITE(mtd,current_request->sector<<9,
current_request->current_nr_sectors << 9,
&retlen, current_request->buffer) == 0)
res = 1;
else
res = 0;
break;
// Shouldn't happen
default:
printk("mtd: unknown request\n");
break;
}
// Grab the lock and re-thread the item onto the linked list
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
spin_lock_irq(&io_request_lock);
#endif
end_request(res);
}
}