[linux-2.6-block.git] / block / compat_ioctl.c

// SPDX-License-Identifier: GPL-2.0
#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/hdreg.h>
#include <linux/pr.h>
#include <linux/slab.h>
#include <linux/syscalls.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_uint(unsigned long arg, unsigned int val)
{
	return put_user(val, (compat_uint_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;

	memset(&geo, 0, sizeof(geo));
	/*
	 * 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 block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
{
	unsigned long __user *p;
	int error;

	p = compat_alloc_user_space(sizeof(unsigned long));
	error = __blkdev_driver_ioctl(bdev, mode,
				cmd, (unsigned long)p);
	if (error == 0) {
		unsigned int __user *uvp = compat_ptr(arg);
		unsigned long v;
		if (get_user(v, p) || put_user(v, uvp))
			error = -EFAULT;
	}
	return error;
}

struct compat_cdrom_read_audio {
	union cdrom_addr	addr;
	u8			addr_format;
	compat_int_t		nframes;
	compat_caddr_t		buf;
};

static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
{
	struct cdrom_read_audio __user *cdread_audio;
	struct compat_cdrom_read_audio __user *cdread_audio32;
	__u32 data;
	void __user *datap;

	cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
	cdread_audio32 = compat_ptr(arg);

	if (copy_in_user(&cdread_audio->addr,
			 &cdread_audio32->addr,
			 (sizeof(*cdread_audio32) -
			  sizeof(compat_caddr_t))))
		return -EFAULT;

	if (get_user(data, &cdread_audio32->buf))
		return -EFAULT;
	datap = compat_ptr(data);
	if (put_user(datap, &cdread_audio->buf))
		return -EFAULT;

	return __blkdev_driver_ioctl(bdev, mode, cmd,
			(unsigned long)cdread_audio);
}

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 block_device *bdev, fmode_t mode,
		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(bdev, mode, 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)

static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
			unsigned cmd, unsigned long arg)
{
	switch (cmd) {
	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(bdev, mode, cmd, arg);
	case CDROMREADAUDIO:
		return compat_cdrom_read_audio(bdev, mode, 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:
	/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
	case 0x330:
	/* 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:
	case CDROM_SEND_PACKET:
	/* 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;
	}

	return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
}

/* 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;
	fmode_t mode = file->f_mode;
	loff_t size;
	unsigned int max_sectors;

	/*
	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
	 * to updated it before every ioctl.
	 */
	if (file->f_flags & O_NDELAY)
		mode |= FMODE_NDELAY;
	else
		mode &= ~FMODE_NDELAY;

	switch (cmd) {
	case HDIO_GETGEO:
		return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
	case BLKPBSZGET:
		return compat_put_uint(arg, bdev_physical_block_size(bdev));
	case BLKIOMIN:
		return compat_put_uint(arg, bdev_io_min(bdev));
	case BLKIOOPT:
		return compat_put_uint(arg, bdev_io_opt(bdev));
	case BLKALIGNOFF:
		return compat_put_int(arg, bdev_alignment_offset(bdev));
	case BLKDISCARDZEROES:
		return compat_put_uint(arg, 0);
	case BLKFLSBUF:
	case BLKROSET:
	case BLKDISCARD:
	case BLKSECDISCARD:
	case BLKZEROOUT:
	/*
	 * the ones below are implemented in blkdev_locked_ioctl,
	 * but we call blkdev_ioctl, which gets the lock for us
	 */
	case BLKRRPART:
	case BLKREPORTZONE:
	case BLKRESETZONE:
	case BLKOPENZONE:
	case BLKCLOSEZONE:
	case BLKFINISHZONE:
	case BLKGETZONESZ:
	case BLKGETNRZONES:
		return blkdev_ioctl(bdev, mode, cmd,
				(unsigned long)compat_ptr(arg));
	case BLKBSZSET_32:
		return blkdev_ioctl(bdev, mode, BLKBSZSET,
				(unsigned long)compat_ptr(arg));
	case BLKPG:
		return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
	case BLKRAGET:
	case BLKFRAGET:
		if (!arg)
			return -EINVAL;
		return compat_put_long(arg,
			       (bdev->bd_bdi->ra_pages * PAGE_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_logical_block_size(bdev));
	case BLKSECTGET:
		max_sectors = min_t(unsigned int, USHRT_MAX,
				    queue_max_sectors(bdev_get_queue(bdev)));
		return compat_put_ushort(arg, max_sectors);
	case BLKROTATIONAL:
		return compat_put_ushort(arg,
					 !blk_queue_nonrot(bdev_get_queue(bdev)));
	case BLKRASET: /* compatible, but no compat_ptr (!) */
	case BLKFRASET:
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
		return 0;
	case BLKGETSIZE:
		size = i_size_read(bdev->bd_inode);
		if ((size >> 9) > ~0UL)
			return -EFBIG;
		return compat_put_ulong(arg, size >> 9);

	case BLKGETSIZE64_32:
		return compat_put_u64(arg, i_size_read(bdev->bd_inode));

	case BLKTRACESETUP32:
	case BLKTRACESTART: /* compatible */
	case BLKTRACESTOP:  /* compatible */
	case BLKTRACETEARDOWN: /* compatible */
		ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
		return ret;
	case IOC_PR_REGISTER:
	case IOC_PR_RESERVE:
	case IOC_PR_RELEASE:
	case IOC_PR_PREEMPT:
	case IOC_PR_PREEMPT_ABORT:
	case IOC_PR_CLEAR:
		return blkdev_ioctl(bdev, mode, cmd,
				(unsigned long)compat_ptr(arg));
	default:
		if (disk->fops->compat_ioctl)
			ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
		if (ret == -ENOIOCTLCMD)
			ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
		return ret;
	}
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
f58c4c0a AB	2	#include <linux/blkdev.h>
	3	#include <linux/blkpg.h>
	4	#include <linux/blktrace_api.h>
	5	#include <linux/cdrom.h>
	6	#include <linux/compat.h>
	7	#include <linux/elevator.h>
f58c4c0a	8	#include <linux/hdreg.h>
b2c0fcd2	9	#include <linux/pr.h>
5a0e3ad6	10	#include <linux/slab.h>
f58c4c0a	11	#include <linux/syscalls.h>
f58c4c0a AB	12	#include <linux/types.h>
	13	#include <linux/uaccess.h>
	14
	15	static int compat_put_ushort(unsigned long arg, unsigned short val)
	16	{
	17	return put_user(val, (unsigned short __user *)compat_ptr(arg));
	18	}
	19
	20	static int compat_put_int(unsigned long arg, int val)
	21	{
	22	return put_user(val, (compat_int_t __user *)compat_ptr(arg));
	23	}
	24
ac481c20 MP	25	static int compat_put_uint(unsigned long arg, unsigned int val)
	26	{
	27	return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
	28	}
	29
f58c4c0a AB	30	static int compat_put_long(unsigned long arg, long val)
	31	{
	32	return put_user(val, (compat_long_t __user *)compat_ptr(arg));
	33	}
	34
	35	static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
	36	{
	37	return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
	38	}
	39
	40	static int compat_put_u64(unsigned long arg, u64 val)
	41	{
	42	return put_user(val, (compat_u64 __user *)compat_ptr(arg));
	43	}
	44
9617db08 AB	45	struct compat_hd_geometry {
	46	unsigned char heads;
	47	unsigned char sectors;
	48	unsigned short cylinders;
	49	u32 start;
	50	};
	51
	52	static int compat_hdio_getgeo(struct gendisk disk, struct block_device bdev,
	53	struct compat_hd_geometry __user *ugeo)
	54	{
	55	struct hd_geometry geo;
	56	int ret;
	57
	58	if (!ugeo)
	59	return -EINVAL;
	60	if (!disk->fops->getgeo)
	61	return -ENOTTY;
	62
8b0d77f1	63	memset(&geo, 0, sizeof(geo));
9617db08 AB	64	/*
	65	* We need to set the startsect first, the driver may
	66	* want to override it.
	67	*/
	68	geo.start = get_start_sect(bdev);
	69	ret = disk->fops->getgeo(bdev, &geo);
	70	if (ret)
	71	return ret;
	72
	73	ret = copy_to_user(ugeo, &geo, 4);
3ddc5b46	74	ret \|= put_user(geo.start, &ugeo->start);
9617db08 AB	75	if (ret)
	76	ret = -EFAULT;
	77
	78	return ret;
	79	}
	80
33c2dca4 AV	81	static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
33c2dca4 AV	82	unsigned int cmd, unsigned long arg)
9617db08	83	{
8363dae2	84	unsigned long __user *p;
9617db08 AB	85	int error;
9617db08 AB	86
30138384	87	p = compat_alloc_user_space(sizeof(unsigned long));
33c2dca4	88	error = __blkdev_driver_ioctl(bdev, mode,
30138384	89	cmd, (unsigned long)p);
9617db08	90	if (error == 0) {
30138384 AV	91	unsigned int __user *uvp = compat_ptr(arg);
	92	unsigned long v;
	93	if (get_user(v, p) \|\| put_user(v, uvp))
9617db08 AB	94	error = -EFAULT;
	95	}
	96	return error;
	97	}
	98
b3087cc4 AB	99	struct compat_cdrom_read_audio {
	100	union cdrom_addr addr;
	101	u8 addr_format;
	102	compat_int_t nframes;
	103	compat_caddr_t buf;
	104	};
	105
33c2dca4 AV	106	static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
33c2dca4 AV	107	unsigned int cmd, unsigned long arg)
b3087cc4 AB	108	{
	109	struct cdrom_read_audio __user *cdread_audio;
	110	struct compat_cdrom_read_audio __user *cdread_audio32;
	111	__u32 data;
	112	void __user *datap;
	113
	114	cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
	115	cdread_audio32 = compat_ptr(arg);
	116
	117	if (copy_in_user(&cdread_audio->addr,
	118	&cdread_audio32->addr,
	119	(sizeof(*cdread_audio32) -
	120	sizeof(compat_caddr_t))))
	121	return -EFAULT;
	122
	123	if (get_user(data, &cdread_audio32->buf))
	124	return -EFAULT;
	125	datap = compat_ptr(data);
	126	if (put_user(datap, &cdread_audio->buf))
	127	return -EFAULT;
	128
33c2dca4	129	return __blkdev_driver_ioctl(bdev, mode, cmd,
b3087cc4 AB	130	(unsigned long)cdread_audio);
	131	}
	132
18cf7f87 AB	133	struct compat_blkpg_ioctl_arg {
	134	compat_int_t op;
	135	compat_int_t flags;
	136	compat_int_t datalen;
	137	compat_caddr_t data;
	138	};
	139
56b26add	140	static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
18cf7f87 AB	141	unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
	142	{
	143	struct blkpg_ioctl_arg __user a = compat_alloc_user_space(sizeof(a));
	144	compat_caddr_t udata;
	145	compat_int_t n;
	146	int err;
	147
	148	err = get_user(n, &ua32->op);
	149	err \|= put_user(n, &a->op);
	150	err \|= get_user(n, &ua32->flags);
	151	err \|= put_user(n, &a->flags);
	152	err \|= get_user(n, &ua32->datalen);
	153	err \|= put_user(n, &a->datalen);
	154	err \|= get_user(udata, &ua32->data);
	155	err \|= put_user(compat_ptr(udata), &a->data);
	156	if (err)
	157	return err;
	158
56b26add	159	return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
18cf7f87 AB	160	}
18cf7f87 AB	161
f58c4c0a AB	162	#define BLKBSZGET_32 _IOR(0x12, 112, int)
	163	#define BLKBSZSET_32 _IOW(0x12, 113, int)
	164	#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
	165
33c2dca4 AV	166	static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
33c2dca4 AV	167	unsigned cmd, unsigned long arg)
7199d4cd	168	{
33013a88	169	switch (cmd) {
9617db08 AB	170	case HDIO_GET_UNMASKINTR:
	171	case HDIO_GET_MULTCOUNT:
	172	case HDIO_GET_KEEPSETTINGS:
	173	case HDIO_GET_32BIT:
	174	case HDIO_GET_NOWERR:
	175	case HDIO_GET_DMA:
	176	case HDIO_GET_NICE:
	177	case HDIO_GET_WCACHE:
	178	case HDIO_GET_ACOUSTIC:
	179	case HDIO_GET_ADDRESS:
	180	case HDIO_GET_BUSSTATE:
33c2dca4	181	return compat_hdio_ioctl(bdev, mode, cmd, arg);
b3087cc4	182	case CDROMREADAUDIO:
33c2dca4	183	return compat_cdrom_read_audio(bdev, mode, cmd, arg);
b3087cc4	184
7199d4cd AB	185	/*
	186	* No handler required for the ones below, we just need to
	187	* convert arg to a 64 bit pointer.
	188	*/
	189	case BLKSECTSET:
	190	/*
	191	* 0x03 -- HD/IDE ioctl's used by hdparm and friends.
	192	* Some need translations, these do not.
	193	*/
	194	case HDIO_GET_IDENTITY:
	195	case HDIO_DRIVE_TASK:
	196	case HDIO_DRIVE_CMD:
7199d4cd AB	197	/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
7199d4cd AB	198	case 0x330:
7199d4cd AB	199	/* CDROM stuff */
	200	case CDROMPAUSE:
	201	case CDROMRESUME:
	202	case CDROMPLAYMSF:
	203	case CDROMPLAYTRKIND:
	204	case CDROMREADTOCHDR:
	205	case CDROMREADTOCENTRY:
	206	case CDROMSTOP:
	207	case CDROMSTART:
	208	case CDROMEJECT:
	209	case CDROMVOLCTRL:
	210	case CDROMSUBCHNL:
	211	case CDROMMULTISESSION:
	212	case CDROM_GET_MCN:
	213	case CDROMRESET:
	214	case CDROMVOLREAD:
	215	case CDROMSEEK:
	216	case CDROMPLAYBLK:
	217	case CDROMCLOSETRAY:
	218	case CDROM_DISC_STATUS:
	219	case CDROM_CHANGER_NSLOTS:
	220	case CDROM_GET_CAPABILITY:
f3ee6e63	221	case CDROM_SEND_PACKET:
7199d4cd AB	222	/* Ignore cdrom.h about these next 5 ioctls, they absolutely do
	223	* not take a struct cdrom_read, instead they take a struct cdrom_msf
	224	* which is compatible.
	225	*/
	226	case CDROMREADMODE2:
	227	case CDROMREADMODE1:
	228	case CDROMREADRAW:
	229	case CDROMREADCOOKED:
	230	case CDROMREADALL:
	231	/* DVD ioctls */
	232	case DVD_READ_STRUCT:
	233	case DVD_WRITE_STRUCT:
	234	case DVD_AUTH:
	235	arg = (unsigned long)compat_ptr(arg);
1c925604 AS	236	/* These intepret arg as an unsigned long, not as a pointer,
	237	* so we must not do compat_ptr() conversion. */
	238	case HDIO_SET_MULTCOUNT:
	239	case HDIO_SET_UNMASKINTR:
	240	case HDIO_SET_KEEPSETTINGS:
	241	case HDIO_SET_32BIT:
	242	case HDIO_SET_NOWERR:
	243	case HDIO_SET_DMA:
	244	case HDIO_SET_PIO_MODE:
	245	case HDIO_SET_NICE:
	246	case HDIO_SET_WCACHE:
	247	case HDIO_SET_ACOUSTIC:
	248	case HDIO_SET_BUSSTATE:
	249	case HDIO_SET_ADDRESS:
	250	case CDROMEJECT_SW:
	251	case CDROM_SET_OPTIONS:
	252	case CDROM_CLEAR_OPTIONS:
	253	case CDROM_SELECT_SPEED:
	254	case CDROM_SELECT_DISC:
	255	case CDROM_MEDIA_CHANGED:
	256	case CDROM_DRIVE_STATUS:
	257	case CDROM_LOCKDOOR:
	258	case CDROM_DEBUG:
7199d4cd AB	259	break;
	260	default:
	261	/* unknown ioctl number */
	262	return -ENOIOCTLCMD;
	263	}
	264
33c2dca4	265	return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
7199d4cd AB	266	}
7199d4cd AB	267
45048d09 AV	268	/* Most of the generic ioctls are handled in the normal fallback path.
	269	This assumes the blkdev's low level compat_ioctl always returns
	270	ENOIOCTLCMD for unknown ioctls. */
	271	long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
f58c4c0a	272	{
45048d09 AV	273	int ret = -ENOIOCTLCMD;
	274	struct inode *inode = file->f_mapping->host;
	275	struct block_device *bdev = inode->i_bdev;
	276	struct gendisk *disk = bdev->bd_disk;
	277	fmode_t mode = file->f_mode;
45048d09	278	loff_t size;
63f26496	279	unsigned int max_sectors;
45048d09	280
fd4ce1ac CH	281	/*
	282	* O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
	283	* to updated it before every ioctl.
	284	*/
45048d09	285	if (file->f_flags & O_NDELAY)
fd4ce1ac CH	286	mode \|= FMODE_NDELAY;
	287	else
	288	mode &= ~FMODE_NDELAY;
f58c4c0a AB	289
f58c4c0a AB	290	switch (cmd) {
45048d09 AV	291	case HDIO_GETGEO:
45048d09 AV	292	return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
ac481c20 MP	293	case BLKPBSZGET:
	294	return compat_put_uint(arg, bdev_physical_block_size(bdev));
	295	case BLKIOMIN:
	296	return compat_put_uint(arg, bdev_io_min(bdev));
	297	case BLKIOOPT:
	298	return compat_put_uint(arg, bdev_io_opt(bdev));
	299	case BLKALIGNOFF:
	300	return compat_put_int(arg, bdev_alignment_offset(bdev));
98262f27	301	case BLKDISCARDZEROES:
48920ff2	302	return compat_put_uint(arg, 0);
45048d09 AV	303	case BLKFLSBUF:
	304	case BLKROSET:
	305	case BLKDISCARD:
8d57a98c	306	case BLKSECDISCARD:
3b3a1814	307	case BLKZEROOUT:
45048d09 AV	308	/*
	309	* the ones below are implemented in blkdev_locked_ioctl,
	310	* but we call blkdev_ioctl, which gets the lock for us
	311	*/
	312	case BLKRRPART:
673bdf8c AB	313	case BLKREPORTZONE:
673bdf8c AB	314	case BLKRESETZONE:
4b43f31d AB	315	case BLKOPENZONE:
	316	case BLKCLOSEZONE:
	317	case BLKFINISHZONE:
21d37340 AB	318	case BLKGETZONESZ:
21d37340 AB	319	case BLKGETNRZONES:
56b26add	320	return blkdev_ioctl(bdev, mode, cmd,
45048d09 AV	321	(unsigned long)compat_ptr(arg));
45048d09 AV	322	case BLKBSZSET_32:
56b26add	323	return blkdev_ioctl(bdev, mode, BLKBSZSET,
45048d09 AV	324	(unsigned long)compat_ptr(arg));
45048d09 AV	325	case BLKPG:
56b26add	326	return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
f58c4c0a AB	327	case BLKRAGET:
	328	case BLKFRAGET:
	329	if (!arg)
	330	return -EINVAL;
f58c4c0a	331	return compat_put_long(arg,
efa7c9f9	332	(bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
f58c4c0a AB	333	case BLKROGET: /* compatible */
	334	return compat_put_int(arg, bdev_read_only(bdev) != 0);
	335	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
	336	return compat_put_int(arg, block_size(bdev));
	337	case BLKSSZGET: /* get block device hardware sector size */
e1defc4f	338	return compat_put_int(arg, bdev_logical_block_size(bdev));
f58c4c0a	339	case BLKSECTGET:
63f26496 AM	340	max_sectors = min_t(unsigned int, USHRT_MAX,
	341	queue_max_sectors(bdev_get_queue(bdev)));
	342	return compat_put_ushort(arg, max_sectors);
ef00f59c MP	343	case BLKROTATIONAL:
	344	return compat_put_ushort(arg,
	345	!blk_queue_nonrot(bdev_get_queue(bdev)));
f58c4c0a AB	346	case BLKRASET: /* compatible, but no compat_ptr (!) */
	347	case BLKFRASET:
	348	if (!capable(CAP_SYS_ADMIN))
	349	return -EACCES;
efa7c9f9	350	bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
f58c4c0a AB	351	return 0;
f58c4c0a AB	352	case BLKGETSIZE:
77304d2a	353	size = i_size_read(bdev->bd_inode);
45048d09	354	if ((size >> 9) > ~0UL)
f58c4c0a	355	return -EFBIG;
45048d09	356	return compat_put_ulong(arg, size >> 9);
f58c4c0a AB	357
f58c4c0a AB	358	case BLKGETSIZE64_32:
77304d2a	359	return compat_put_u64(arg, i_size_read(bdev->bd_inode));
171044d4 AB	360
171044d4 AB	361	case BLKTRACESETUP32:
171044d4 AB	362	case BLKTRACESTART: /* compatible */
	363	case BLKTRACESTOP: /* compatible */
	364	case BLKTRACETEARDOWN: /* compatible */
45048d09	365	ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
7199d4cd	366	return ret;
b2c0fcd2 AB	367	case IOC_PR_REGISTER:
	368	case IOC_PR_RESERVE:
	369	case IOC_PR_RELEASE:
	370	case IOC_PR_PREEMPT:
	371	case IOC_PR_PREEMPT_ABORT:
	372	case IOC_PR_CLEAR:
	373	return blkdev_ioctl(bdev, mode, cmd,
	374	(unsigned long)compat_ptr(arg));
45048d09 AV	375	default:
	376	if (disk->fops->compat_ioctl)
	377	ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
	378	if (ret == -ENOIOCTLCMD)
	379	ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
	380	return ret;
	381	}
f58c4c0a	382	}