Arnd Bergmann | f58c4c0 | 2007-10-09 13:23:51 +0200 | [diff] [blame^] | 1 | #include <linux/blkdev.h> |
| 2 | #include <linux/blkpg.h> |
| 3 | #include <linux/blktrace_api.h> |
| 4 | #include <linux/cdrom.h> |
| 5 | #include <linux/compat.h> |
| 6 | #include <linux/elevator.h> |
| 7 | #include <linux/fd.h> |
| 8 | #include <linux/hdreg.h> |
| 9 | #include <linux/syscalls.h> |
| 10 | #include <linux/smp_lock.h> |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/uaccess.h> |
| 13 | |
| 14 | static int compat_put_ushort(unsigned long arg, unsigned short val) |
| 15 | { |
| 16 | return put_user(val, (unsigned short __user *)compat_ptr(arg)); |
| 17 | } |
| 18 | |
| 19 | static int compat_put_int(unsigned long arg, int val) |
| 20 | { |
| 21 | return put_user(val, (compat_int_t __user *)compat_ptr(arg)); |
| 22 | } |
| 23 | |
| 24 | static int compat_put_long(unsigned long arg, long val) |
| 25 | { |
| 26 | return put_user(val, (compat_long_t __user *)compat_ptr(arg)); |
| 27 | } |
| 28 | |
| 29 | static int compat_put_ulong(unsigned long arg, compat_ulong_t val) |
| 30 | { |
| 31 | return put_user(val, (compat_ulong_t __user *)compat_ptr(arg)); |
| 32 | } |
| 33 | |
| 34 | static int compat_put_u64(unsigned long arg, u64 val) |
| 35 | { |
| 36 | return put_user(val, (compat_u64 __user *)compat_ptr(arg)); |
| 37 | } |
| 38 | |
| 39 | #define BLKBSZGET_32 _IOR(0x12, 112, int) |
| 40 | #define BLKBSZSET_32 _IOW(0x12, 113, int) |
| 41 | #define BLKGETSIZE64_32 _IOR(0x12, 114, int) |
| 42 | |
| 43 | static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file, |
| 44 | struct block_device *bdev, |
| 45 | unsigned cmd, unsigned long arg) |
| 46 | { |
| 47 | struct backing_dev_info *bdi; |
| 48 | |
| 49 | switch (cmd) { |
| 50 | case BLKRAGET: |
| 51 | case BLKFRAGET: |
| 52 | if (!arg) |
| 53 | return -EINVAL; |
| 54 | bdi = blk_get_backing_dev_info(bdev); |
| 55 | if (bdi == NULL) |
| 56 | return -ENOTTY; |
| 57 | return compat_put_long(arg, |
| 58 | (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); |
| 59 | case BLKROGET: /* compatible */ |
| 60 | return compat_put_int(arg, bdev_read_only(bdev) != 0); |
| 61 | case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ |
| 62 | return compat_put_int(arg, block_size(bdev)); |
| 63 | case BLKSSZGET: /* get block device hardware sector size */ |
| 64 | return compat_put_int(arg, bdev_hardsect_size(bdev)); |
| 65 | case BLKSECTGET: |
| 66 | return compat_put_ushort(arg, |
| 67 | bdev_get_queue(bdev)->max_sectors); |
| 68 | case BLKRASET: /* compatible, but no compat_ptr (!) */ |
| 69 | case BLKFRASET: |
| 70 | if (!capable(CAP_SYS_ADMIN)) |
| 71 | return -EACCES; |
| 72 | bdi = blk_get_backing_dev_info(bdev); |
| 73 | if (bdi == NULL) |
| 74 | return -ENOTTY; |
| 75 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; |
| 76 | return 0; |
| 77 | case BLKGETSIZE: |
| 78 | if ((bdev->bd_inode->i_size >> 9) > ~0UL) |
| 79 | return -EFBIG; |
| 80 | return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9); |
| 81 | |
| 82 | case BLKGETSIZE64_32: |
| 83 | return compat_put_u64(arg, bdev->bd_inode->i_size); |
| 84 | } |
| 85 | return -ENOIOCTLCMD; |
| 86 | } |
| 87 | |
| 88 | /* Most of the generic ioctls are handled in the normal fallback path. |
| 89 | This assumes the blkdev's low level compat_ioctl always returns |
| 90 | ENOIOCTLCMD for unknown ioctls. */ |
| 91 | long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
| 92 | { |
| 93 | int ret = -ENOIOCTLCMD; |
| 94 | struct inode *inode = file->f_mapping->host; |
| 95 | struct block_device *bdev = inode->i_bdev; |
| 96 | struct gendisk *disk = bdev->bd_disk; |
| 97 | |
| 98 | switch (cmd) { |
| 99 | case BLKFLSBUF: |
| 100 | case BLKROSET: |
| 101 | /* |
| 102 | * the ones below are implemented in blkdev_locked_ioctl, |
| 103 | * but we call blkdev_ioctl, which gets the lock for us |
| 104 | */ |
| 105 | case BLKRRPART: |
| 106 | return blkdev_ioctl(inode, file, cmd, |
| 107 | (unsigned long)compat_ptr(arg)); |
| 108 | case BLKBSZSET_32: |
| 109 | return blkdev_ioctl(inode, file, BLKBSZSET, |
| 110 | (unsigned long)compat_ptr(arg)); |
| 111 | } |
| 112 | |
| 113 | lock_kernel(); |
| 114 | ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg); |
| 115 | /* FIXME: why do we assume -> compat_ioctl needs the BKL? */ |
| 116 | if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) |
| 117 | ret = disk->fops->compat_ioctl(file, cmd, arg); |
| 118 | unlock_kernel(); |
| 119 | |
| 120 | return ret; |
| 121 | } |