[mirror_ubuntu-bionic-kernel.git] / block / compat_ioctl.c

#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;
}
Commit	Line	Data
f58c4c0a AB	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	}