1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
#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;
}
|
