[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));
}

struct compat_hd_geometry {
	unsigned char heads;
	unsigned char sectors;
	unsigned short cylinders;
	u32 start;
};

static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
			struct compat_hd_geometry __user *ugeo)
{
	struct hd_geometry geo;
	int ret;

	if (!ugeo)
		return -EINVAL;
	if (!disk->fops->getgeo)
		return -ENOTTY;

	/*
	 * We need to set the startsect first, the driver may
	 * want to override it.
	 */
	geo.start = get_start_sect(bdev);
	ret = disk->fops->getgeo(bdev, &geo);
	if (ret)
		return ret;

	ret = copy_to_user(ugeo, &geo, 4);
	ret |= __put_user(geo.start, &ugeo->start);
	if (ret)
		ret = -EFAULT;

	return ret;
}

static int compat_hdio_ioctl(struct inode *inode, struct file *file,
		struct gendisk *disk, unsigned int cmd, unsigned long arg)
{
	mm_segment_t old_fs = get_fs();
	unsigned long kval;
	unsigned int __user *uvp;
	int error;

	set_fs(KERNEL_DS);
	error = blkdev_driver_ioctl(inode, file, disk,
				cmd, (unsigned long)(&kval));
	set_fs(old_fs);

	if (error == 0) {
		uvp = compat_ptr(arg);
		if (put_user(kval, uvp))
			error = -EFAULT;
	}
	return error;
}

struct compat_blkpg_ioctl_arg {
	compat_int_t op;
	compat_int_t flags;
	compat_int_t datalen;
	compat_caddr_t data;
};

static int compat_blkpg_ioctl(struct inode *inode, struct file *file,
		unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
{
	struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
	compat_caddr_t udata;
	compat_int_t n;
	int err;

	err = get_user(n, &ua32->op);
	err |= put_user(n, &a->op);
	err |= get_user(n, &ua32->flags);
	err |= put_user(n, &a->flags);
	err |= get_user(n, &ua32->datalen);
	err |= put_user(n, &a->datalen);
	err |= get_user(udata, &ua32->data);
	err |= put_user(compat_ptr(udata), &a->data);
	if (err)
		return err;

	return blkdev_ioctl(inode, file, cmd, (unsigned long)a);
}

#define BLKBSZGET_32		_IOR(0x12, 112, int)
#define BLKBSZSET_32		_IOW(0x12, 113, int)
#define BLKGETSIZE64_32		_IOR(0x12, 114, int)

struct compat_blk_user_trace_setup {
	char name[32];
	u16 act_mask;
	u32 buf_size;
	u32 buf_nr;
	compat_u64 start_lba;
	compat_u64 end_lba;
	u32 pid;
};
#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)

static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg)
{
	struct blk_user_trace_setup buts;
	struct compat_blk_user_trace_setup cbuts;
	struct request_queue *q;
	int ret;

	q = bdev_get_queue(bdev);
	if (!q)
		return -ENXIO;

	if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
		return -EFAULT;

	buts = (struct blk_user_trace_setup) {
		.act_mask = cbuts.act_mask,
		.buf_size = cbuts.buf_size,
		.buf_nr = cbuts.buf_nr,
		.start_lba = cbuts.start_lba,
		.end_lba = cbuts.end_lba,
		.pid = cbuts.pid,
	};
	memcpy(&buts.name, &cbuts.name, 32);

	mutex_lock(&bdev->bd_mutex);
	ret = do_blk_trace_setup(q, bdev, &buts);
	mutex_unlock(&bdev->bd_mutex);
	if (ret)
		return ret;

	if (copy_to_user(arg, &buts.name, 32))
		return -EFAULT;

	return 0;
}

static int compat_blkdev_driver_ioctl(struct inode *inode, struct file *file,
			struct gendisk *disk, unsigned cmd, unsigned long arg)
{
	int ret;

	switch (arg) {
	case HDIO_GET_UNMASKINTR:
	case HDIO_GET_MULTCOUNT:
	case HDIO_GET_KEEPSETTINGS:
	case HDIO_GET_32BIT:
	case HDIO_GET_NOWERR:
	case HDIO_GET_DMA:
	case HDIO_GET_NICE:
	case HDIO_GET_WCACHE:
	case HDIO_GET_ACOUSTIC:
	case HDIO_GET_ADDRESS:
	case HDIO_GET_BUSSTATE:
		return compat_hdio_ioctl(inode, file, disk, cmd, arg);
	/*
	 * No handler required for the ones below, we just need to
	 * convert arg to a 64 bit pointer.
	 */
	case BLKSECTSET:
	/*
	 * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
	 *         Some need translations, these do not.
	 */
	case HDIO_GET_IDENTITY:
	case HDIO_DRIVE_TASK:
	case HDIO_DRIVE_CMD:
	case HDIO_SCAN_HWIF:
	/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
	case 0x330:
	/* 0x02 -- Floppy ioctls */
	case FDMSGON:
	case FDMSGOFF:
	case FDSETEMSGTRESH:
	case FDFLUSH:
	case FDWERRORCLR:
	case FDSETMAXERRS:
	case FDGETMAXERRS:
	case FDGETDRVTYP:
	case FDEJECT:
	case FDCLRPRM:
	case FDFMTBEG:
	case FDFMTEND:
	case FDRESET:
	case FDTWADDLE:
	case FDFMTTRK:
	case FDRAWCMD:
	/* CDROM stuff */
	case CDROMPAUSE:
	case CDROMRESUME:
	case CDROMPLAYMSF:
	case CDROMPLAYTRKIND:
	case CDROMREADTOCHDR:
	case CDROMREADTOCENTRY:
	case CDROMSTOP:
	case CDROMSTART:
	case CDROMEJECT:
	case CDROMVOLCTRL:
	case CDROMSUBCHNL:
	case CDROMMULTISESSION:
	case CDROM_GET_MCN:
	case CDROMRESET:
	case CDROMVOLREAD:
	case CDROMSEEK:
	case CDROMPLAYBLK:
	case CDROMCLOSETRAY:
	case CDROM_DISC_STATUS:
	case CDROM_CHANGER_NSLOTS:
	case CDROM_GET_CAPABILITY:
	/* Ignore cdrom.h about these next 5 ioctls, they absolutely do
	 * not take a struct cdrom_read, instead they take a struct cdrom_msf
	 * which is compatible.
	 */
	case CDROMREADMODE2:
	case CDROMREADMODE1:
	case CDROMREADRAW:
	case CDROMREADCOOKED:
	case CDROMREADALL:
	/* DVD ioctls */
	case DVD_READ_STRUCT:
	case DVD_WRITE_STRUCT:
	case DVD_AUTH:
		arg = (unsigned long)compat_ptr(arg);
	/* These intepret arg as an unsigned long, not as a pointer,
	 * so we must not do compat_ptr() conversion. */
	case HDIO_SET_MULTCOUNT:
	case HDIO_SET_UNMASKINTR:
	case HDIO_SET_KEEPSETTINGS:
	case HDIO_SET_32BIT:
	case HDIO_SET_NOWERR:
	case HDIO_SET_DMA:
	case HDIO_SET_PIO_MODE:
	case HDIO_SET_NICE:
	case HDIO_SET_WCACHE:
	case HDIO_SET_ACOUSTIC:
	case HDIO_SET_BUSSTATE:
	case HDIO_SET_ADDRESS:
	case CDROMEJECT_SW:
	case CDROM_SET_OPTIONS:
	case CDROM_CLEAR_OPTIONS:
	case CDROM_SELECT_SPEED:
	case CDROM_SELECT_DISC:
	case CDROM_MEDIA_CHANGED:
	case CDROM_DRIVE_STATUS:
	case CDROM_LOCKDOOR:
	case CDROM_DEBUG:
		break;
	default:
		/* unknown ioctl number */
		return -ENOIOCTLCMD;
	}

	if (disk->fops->unlocked_ioctl)
		return disk->fops->unlocked_ioctl(file, cmd, arg);

	if (disk->fops->ioctl) {
		lock_kernel();
		ret = disk->fops->ioctl(inode, file, cmd, arg);
		unlock_kernel();
		return ret;
	}

	return -ENOTTY;
}

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);

	case BLKTRACESETUP32:
		return compat_blk_trace_setup(bdev, compat_ptr(arg));
	case BLKTRACESTART: /* compatible */
	case BLKTRACESTOP:  /* compatible */
	case BLKTRACETEARDOWN: /* compatible */
		return blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
	}
	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 HDIO_GETGEO:
		return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
	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));
	case BLKPG:
		return compat_blkpg_ioctl(inode, file, cmd, 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();

	if (ret != -ENOIOCTLCMD)
		return ret;

	return compat_blkdev_driver_ioctl(inode, file, disk, cmd, arg);
}
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
9617db08 AB	39	struct compat_hd_geometry {
	40	unsigned char heads;
	41	unsigned char sectors;
	42	unsigned short cylinders;
	43	u32 start;
	44	};
	45
	46	static int compat_hdio_getgeo(struct gendisk disk, struct block_device bdev,
	47	struct compat_hd_geometry __user *ugeo)
	48	{
	49	struct hd_geometry geo;
	50	int ret;
	51
	52	if (!ugeo)
	53	return -EINVAL;
	54	if (!disk->fops->getgeo)
	55	return -ENOTTY;
	56
	57	/*
	58	* We need to set the startsect first, the driver may
	59	* want to override it.
	60	*/
	61	geo.start = get_start_sect(bdev);
	62	ret = disk->fops->getgeo(bdev, &geo);
	63	if (ret)
	64	return ret;
	65
	66	ret = copy_to_user(ugeo, &geo, 4);
	67	ret \|= __put_user(geo.start, &ugeo->start);
	68	if (ret)
	69	ret = -EFAULT;
	70
	71	return ret;
	72	}
	73
	74	static int compat_hdio_ioctl(struct inode inode, struct file file,
	75	struct gendisk *disk, unsigned int cmd, unsigned long arg)
	76	{
	77	mm_segment_t old_fs = get_fs();
	78	unsigned long kval;
	79	unsigned int __user *uvp;
	80	int error;
	81
	82	set_fs(KERNEL_DS);
	83	error = blkdev_driver_ioctl(inode, file, disk,
	84	cmd, (unsigned long)(&kval));
	85	set_fs(old_fs);
	86
	87	if (error == 0) {
	88	uvp = compat_ptr(arg);
	89	if (put_user(kval, uvp))
	90	error = -EFAULT;
	91	}
	92	return error;
	93	}
	94
18cf7f87 AB	95	struct compat_blkpg_ioctl_arg {
	96	compat_int_t op;
	97	compat_int_t flags;
	98	compat_int_t datalen;
	99	compat_caddr_t data;
	100	};
	101
	102	static int compat_blkpg_ioctl(struct inode inode, struct file file,
	103	unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
	104	{
	105	struct blkpg_ioctl_arg __user a = compat_alloc_user_space(sizeof(a));
	106	compat_caddr_t udata;
	107	compat_int_t n;
	108	int err;
	109
	110	err = get_user(n, &ua32->op);
	111	err \|= put_user(n, &a->op);
	112	err \|= get_user(n, &ua32->flags);
	113	err \|= put_user(n, &a->flags);
	114	err \|= get_user(n, &ua32->datalen);
	115	err \|= put_user(n, &a->datalen);
	116	err \|= get_user(udata, &ua32->data);
	117	err \|= put_user(compat_ptr(udata), &a->data);
	118	if (err)
	119	return err;
	120
	121	return blkdev_ioctl(inode, file, cmd, (unsigned long)a);
	122	}
	123
f58c4c0a AB	124	#define BLKBSZGET_32 _IOR(0x12, 112, int)
	125	#define BLKBSZSET_32 _IOW(0x12, 113, int)
	126	#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
	127
171044d4 AB	128	struct compat_blk_user_trace_setup {
	129	char name[32];
	130	u16 act_mask;
	131	u32 buf_size;
	132	u32 buf_nr;
	133	compat_u64 start_lba;
	134	compat_u64 end_lba;
	135	u32 pid;
	136	};
	137	#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
	138
	139	static int compat_blk_trace_setup(struct block_device bdev, char __user arg)
	140	{
	141	struct blk_user_trace_setup buts;
	142	struct compat_blk_user_trace_setup cbuts;
	143	struct request_queue *q;
	144	int ret;
	145
	146	q = bdev_get_queue(bdev);
	147	if (!q)
	148	return -ENXIO;
	149
	150	if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
	151	return -EFAULT;
	152
	153	buts = (struct blk_user_trace_setup) {
	154	.act_mask = cbuts.act_mask,
	155	.buf_size = cbuts.buf_size,
	156	.buf_nr = cbuts.buf_nr,
	157	.start_lba = cbuts.start_lba,
	158	.end_lba = cbuts.end_lba,
	159	.pid = cbuts.pid,
	160	};
	161	memcpy(&buts.name, &cbuts.name, 32);
	162
	163	mutex_lock(&bdev->bd_mutex);
	164	ret = do_blk_trace_setup(q, bdev, &buts);
	165	mutex_unlock(&bdev->bd_mutex);
	166	if (ret)
	167	return ret;
	168
	169	if (copy_to_user(arg, &buts.name, 32))
	170	return -EFAULT;
	171
	172	return 0;
	173	}
	174
7199d4cd AB	175	static int compat_blkdev_driver_ioctl(struct inode inode, struct file file,
	176	struct gendisk *disk, unsigned cmd, unsigned long arg)
	177	{
	178	int ret;
	179
	180	switch (arg) {
9617db08 AB	181	case HDIO_GET_UNMASKINTR:
	182	case HDIO_GET_MULTCOUNT:
	183	case HDIO_GET_KEEPSETTINGS:
	184	case HDIO_GET_32BIT:
	185	case HDIO_GET_NOWERR:
	186	case HDIO_GET_DMA:
	187	case HDIO_GET_NICE:
	188	case HDIO_GET_WCACHE:
	189	case HDIO_GET_ACOUSTIC:
	190	case HDIO_GET_ADDRESS:
	191	case HDIO_GET_BUSSTATE:
	192	return compat_hdio_ioctl(inode, file, disk, cmd, arg);
7199d4cd AB	193	/*
	194	* No handler required for the ones below, we just need to
	195	* convert arg to a 64 bit pointer.
	196	*/
	197	case BLKSECTSET:
	198	/*
	199	* 0x03 -- HD/IDE ioctl's used by hdparm and friends.
	200	* Some need translations, these do not.
	201	*/
	202	case HDIO_GET_IDENTITY:
	203	case HDIO_DRIVE_TASK:
	204	case HDIO_DRIVE_CMD:
	205	case HDIO_SCAN_HWIF:
	206	/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
	207	case 0x330:
	208	/* 0x02 -- Floppy ioctls */
	209	case FDMSGON:
	210	case FDMSGOFF:
	211	case FDSETEMSGTRESH:
	212	case FDFLUSH:
	213	case FDWERRORCLR:
	214	case FDSETMAXERRS:
	215	case FDGETMAXERRS:
	216	case FDGETDRVTYP:
	217	case FDEJECT:
	218	case FDCLRPRM:
	219	case FDFMTBEG:
	220	case FDFMTEND:
	221	case FDRESET:
	222	case FDTWADDLE:
	223	case FDFMTTRK:
	224	case FDRAWCMD:
	225	/* CDROM stuff */
	226	case CDROMPAUSE:
	227	case CDROMRESUME:
	228	case CDROMPLAYMSF:
	229	case CDROMPLAYTRKIND:
	230	case CDROMREADTOCHDR:
	231	case CDROMREADTOCENTRY:
	232	case CDROMSTOP:
	233	case CDROMSTART:
	234	case CDROMEJECT:
	235	case CDROMVOLCTRL:
	236	case CDROMSUBCHNL:
	237	case CDROMMULTISESSION:
	238	case CDROM_GET_MCN:
	239	case CDROMRESET:
	240	case CDROMVOLREAD:
	241	case CDROMSEEK:
	242	case CDROMPLAYBLK:
	243	case CDROMCLOSETRAY:
	244	case CDROM_DISC_STATUS:
	245	case CDROM_CHANGER_NSLOTS:
	246	case CDROM_GET_CAPABILITY:
	247	/* Ignore cdrom.h about these next 5 ioctls, they absolutely do
	248	* not take a struct cdrom_read, instead they take a struct cdrom_msf
	249	* which is compatible.
	250	*/
	251	case CDROMREADMODE2:
	252	case CDROMREADMODE1:
	253	case CDROMREADRAW:
	254	case CDROMREADCOOKED:
	255	case CDROMREADALL:
	256	/* DVD ioctls */
257	case DVD_READ_STRUCT:
258	case DVD_WRITE_STRUCT:
259	case DVD_AUTH:
260	arg = (unsigned long)compat_ptr(arg);
261	/* These intepret arg as an unsigned long, not as a pointer,
262	* so we must not do compat_ptr() conversion. */
263	case HDIO_SET_MULTCOUNT:
264	case HDIO_SET_UNMASKINTR:
265	case HDIO_SET_KEEPSETTINGS:
266	case HDIO_SET_32BIT:
267	case HDIO_SET_NOWERR:
268	case HDIO_SET_DMA:
269	case HDIO_SET_PIO_MODE:
270	case HDIO_SET_NICE:
271	case HDIO_SET_WCACHE:
272	case HDIO_SET_ACOUSTIC:
273	case HDIO_SET_BUSSTATE:
274	case HDIO_SET_ADDRESS:
275	case CDROMEJECT_SW:
276	case CDROM_SET_OPTIONS:
277	case CDROM_CLEAR_OPTIONS:
278	case CDROM_SELECT_SPEED:
279	case CDROM_SELECT_DISC:
280	case CDROM_MEDIA_CHANGED:
281	case CDROM_DRIVE_STATUS:
282	case CDROM_LOCKDOOR:
283	case CDROM_DEBUG:
284	break;
285	default:
286	/* unknown ioctl number */
287	return -ENOIOCTLCMD;
288	}
289
290	if (disk->fops->unlocked_ioctl)
291	return disk->fops->unlocked_ioctl(file, cmd, arg);
292
293	if (disk->fops->ioctl) {
294	lock_kernel();
295	ret = disk->fops->ioctl(inode, file, cmd, arg);
296	unlock_kernel();
297	return ret;
298	}
299
300	return -ENOTTY;
301	}
302
f58c4c0a AB	303	static int compat_blkdev_locked_ioctl(struct inode inode, struct file file,
	304	struct block_device *bdev,
	305	unsigned cmd, unsigned long arg)
	306	{
	307	struct backing_dev_info *bdi;
	308
	309	switch (cmd) {
	310	case BLKRAGET:
	311	case BLKFRAGET:
	312	if (!arg)
	313	return -EINVAL;
	314	bdi = blk_get_backing_dev_info(bdev);
	315	if (bdi == NULL)
	316	return -ENOTTY;
	317	return compat_put_long(arg,
	318	(bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	319	case BLKROGET: /* compatible */
	320	return compat_put_int(arg, bdev_read_only(bdev) != 0);
	321	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
	322	return compat_put_int(arg, block_size(bdev));
	323	case BLKSSZGET: /* get block device hardware sector size */
	324	return compat_put_int(arg, bdev_hardsect_size(bdev));
	325	case BLKSECTGET:
	326	return compat_put_ushort(arg,
	327	bdev_get_queue(bdev)->max_sectors);
	328	case BLKRASET: /* compatible, but no compat_ptr (!) */
	329	case BLKFRASET:
	330	if (!capable(CAP_SYS_ADMIN))
	331	return -EACCES;
	332	bdi = blk_get_backing_dev_info(bdev);
	333	if (bdi == NULL)
	334	return -ENOTTY;
	335	bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
	336	return 0;
	337	case BLKGETSIZE:
	338	if ((bdev->bd_inode->i_size >> 9) > ~0UL)
	339	return -EFBIG;
	340	return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);
	341
	342	case BLKGETSIZE64_32:
	343	return compat_put_u64(arg, bdev->bd_inode->i_size);
171044d4 AB	344
	345	case BLKTRACESETUP32:
	346	return compat_blk_trace_setup(bdev, compat_ptr(arg));
	347	case BLKTRACESTART: /* compatible */
	348	case BLKTRACESTOP: /* compatible */
	349	case BLKTRACETEARDOWN: /* compatible */
	350	return blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
f58c4c0a AB	351	}
	352	return -ENOIOCTLCMD;
	353	}
	354
	355	/* Most of the generic ioctls are handled in the normal fallback path.
	356	This assumes the blkdev's low level compat_ioctl always returns
	357	ENOIOCTLCMD for unknown ioctls. */
	358	long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
	359	{
	360	int ret = -ENOIOCTLCMD;
	361	struct inode *inode = file->f_mapping->host;
	362	struct block_device *bdev = inode->i_bdev;
	363	struct gendisk *disk = bdev->bd_disk;
	364
	365	switch (cmd) {
9617db08 AB	366	case HDIO_GETGEO:
9617db08 AB	367	return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
f58c4c0a AB	368	case BLKFLSBUF:
	369	case BLKROSET:
	370	/*
	371	* the ones below are implemented in blkdev_locked_ioctl,
	372	* but we call blkdev_ioctl, which gets the lock for us
	373	*/
	374	case BLKRRPART:
	375	return blkdev_ioctl(inode, file, cmd,
	376	(unsigned long)compat_ptr(arg));
	377	case BLKBSZSET_32:
	378	return blkdev_ioctl(inode, file, BLKBSZSET,
	379	(unsigned long)compat_ptr(arg));
18cf7f87 AB	380	case BLKPG:
18cf7f87 AB	381	return compat_blkpg_ioctl(inode, file, cmd, compat_ptr(arg));
f58c4c0a AB	382	}
	383
	384	lock_kernel();
	385	ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg);
	386	/* FIXME: why do we assume -> compat_ioctl needs the BKL? */
	387	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
	388	ret = disk->fops->compat_ioctl(file, cmd, arg);
	389	unlock_kernel();
	390
7199d4cd AB	391	if (ret != -ENOIOCTLCMD)
	392	return ret;
	393
	394	return compat_blkdev_driver_ioctl(inode, file, disk, cmd, arg);
f58c4c0a	395	}