| #include <linux/blkdev.h> |
| #include <linux/blkpg.h> |
| #include <linux/blktrace_api.h> |
| #include <linux/cdrom.h> |
| #include <linux/compat.h> |
| #include <linux/elevator.h> |
| #include <linux/fd.h> |
| #include <linux/hdreg.h> |
| #include <linux/syscalls.h> |
| #include <linux/smp_lock.h> |
| #include <linux/types.h> |
| #include <linux/uaccess.h> |
| |
| static int compat_put_ushort(unsigned long arg, unsigned short val) |
| { |
| return put_user(val, (unsigned short __user *)compat_ptr(arg)); |
| } |
| |
| static int compat_put_int(unsigned long arg, int val) |
| { |
| return put_user(val, (compat_int_t __user *)compat_ptr(arg)); |
| } |
| |
| static int compat_put_long(unsigned long arg, long val) |
| { |
| return put_user(val, (compat_long_t __user *)compat_ptr(arg)); |
| } |
| |
| static int compat_put_ulong(unsigned long arg, compat_ulong_t val) |
| { |
| return put_user(val, (compat_ulong_t __user *)compat_ptr(arg)); |
| } |
| |
| static int compat_put_u64(unsigned long arg, u64 val) |
| { |
| return put_user(val, (compat_u64 __user *)compat_ptr(arg)); |
| } |
| |
| #define BLKBSZGET_32 _IOR(0x12, 112, int) |
| #define BLKBSZSET_32 _IOW(0x12, 113, int) |
| #define BLKGETSIZE64_32 _IOR(0x12, 114, int) |
| |
| static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file, |
| struct block_device *bdev, |
| unsigned cmd, unsigned long arg) |
| { |
| struct backing_dev_info *bdi; |
| |
| switch (cmd) { |
| case BLKRAGET: |
| case BLKFRAGET: |
| if (!arg) |
| return -EINVAL; |
| bdi = blk_get_backing_dev_info(bdev); |
| if (bdi == NULL) |
| return -ENOTTY; |
| return compat_put_long(arg, |
| (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); |
| case BLKROGET: /* compatible */ |
| return compat_put_int(arg, bdev_read_only(bdev) != 0); |
| case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ |
| return compat_put_int(arg, block_size(bdev)); |
| case BLKSSZGET: /* get block device hardware sector size */ |
| return compat_put_int(arg, bdev_hardsect_size(bdev)); |
| case BLKSECTGET: |
| return compat_put_ushort(arg, |
| bdev_get_queue(bdev)->max_sectors); |
| case BLKRASET: /* compatible, but no compat_ptr (!) */ |
| case BLKFRASET: |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| bdi = blk_get_backing_dev_info(bdev); |
| if (bdi == NULL) |
| return -ENOTTY; |
| bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; |
| return 0; |
| case BLKGETSIZE: |
| if ((bdev->bd_inode->i_size >> 9) > ~0UL) |
| return -EFBIG; |
| return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9); |
| |
| case BLKGETSIZE64_32: |
| return compat_put_u64(arg, bdev->bd_inode->i_size); |
| } |
| return -ENOIOCTLCMD; |
| } |
| |
| /* Most of the generic ioctls are handled in the normal fallback path. |
| This assumes the blkdev's low level compat_ioctl always returns |
| ENOIOCTLCMD for unknown ioctls. */ |
| long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
| { |
| int ret = -ENOIOCTLCMD; |
| struct inode *inode = file->f_mapping->host; |
| struct block_device *bdev = inode->i_bdev; |
| struct gendisk *disk = bdev->bd_disk; |
| |
| switch (cmd) { |
| case BLKFLSBUF: |
| case BLKROSET: |
| /* |
| * the ones below are implemented in blkdev_locked_ioctl, |
| * but we call blkdev_ioctl, which gets the lock for us |
| */ |
| case BLKRRPART: |
| return blkdev_ioctl(inode, file, cmd, |
| (unsigned long)compat_ptr(arg)); |
| case BLKBSZSET_32: |
| return blkdev_ioctl(inode, file, BLKBSZSET, |
| (unsigned long)compat_ptr(arg)); |
| } |
| |
| lock_kernel(); |
| ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg); |
| /* FIXME: why do we assume -> compat_ioctl needs the BKL? */ |
| if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) |
| ret = disk->fops->compat_ioctl(file, cmd, arg); |
| unlock_kernel(); |
| |
| return ret; |
| } |