[linux.git] / block / ioctl.c

#include <linux/capability.h>
#include <linux/blkdev.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/blkpg.h>
#include <linux/hdreg.h>
#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/blktrace_api.h>
#include <asm/uaccess.h>

static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
{
	struct block_device *bdevp;
	struct gendisk *disk;
	struct hd_struct *part;
	struct blkpg_ioctl_arg a;
	struct blkpg_partition p;
	struct disk_part_iter piter;
	long long start, length;
	int partno;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
		return -EFAULT;
	if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
		return -EFAULT;
	disk = bdev->bd_disk;
	if (bdev != bdev->bd_contains)
		return -EINVAL;
	partno = p.pno;
	if (partno <= 0)
		return -EINVAL;
	switch (a.op) {
		case BLKPG_ADD_PARTITION:
			start = p.start >> 9;
			length = p.length >> 9;
			/* check for fit in a hd_struct */ 
			if (sizeof(sector_t) == sizeof(long) && 
			    sizeof(long long) > sizeof(long)) {
				long pstart = start, plength = length;
				if (pstart != start || plength != length
				    || pstart < 0 || plength < 0)
					return -EINVAL;
			}

			mutex_lock(&bdev->bd_mutex);

			/* overlap? */
			disk_part_iter_init(&piter, disk,
					    DISK_PITER_INCL_EMPTY);
			while ((part = disk_part_iter_next(&piter))) {
				if (!(start + length <= part->start_sect ||
				      start >= part->start_sect + part->nr_sects)) {
					disk_part_iter_exit(&piter);
					mutex_unlock(&bdev->bd_mutex);
					return -EBUSY;
				}
			}
			disk_part_iter_exit(&piter);

			/* all seems OK */
			part = add_partition(disk, partno, start, length,
					     ADDPART_FLAG_NONE, NULL);
			mutex_unlock(&bdev->bd_mutex);
			return IS_ERR(part) ? PTR_ERR(part) : 0;
		case BLKPG_DEL_PARTITION:
			part = disk_get_part(disk, partno);
			if (!part)
				return -ENXIO;

			bdevp = bdget(part_devt(part));
			disk_put_part(part);
			if (!bdevp)
				return -ENOMEM;

			mutex_lock(&bdevp->bd_mutex);
			if (bdevp->bd_openers) {
				mutex_unlock(&bdevp->bd_mutex);
				bdput(bdevp);
				return -EBUSY;
			}
			/* all seems OK */
			fsync_bdev(bdevp);
			invalidate_bdev(bdevp);

			mutex_lock_nested(&bdev->bd_mutex, 1);
			delete_partition(disk, partno);
			mutex_unlock(&bdev->bd_mutex);
			mutex_unlock(&bdevp->bd_mutex);
			bdput(bdevp);

			return 0;
		default:
			return -EINVAL;
	}
}

static int blkdev_reread_part(struct block_device *bdev)
{
	struct gendisk *disk = bdev->bd_disk;
	int res;

	if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
		return -EINVAL;
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (!mutex_trylock(&bdev->bd_mutex))
		return -EBUSY;
	res = rescan_partitions(disk, bdev);
	mutex_unlock(&bdev->bd_mutex);
	return res;
}

static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
			     uint64_t len, int secure)
{
	unsigned long flags = 0;

	if (start & 511)
		return -EINVAL;
	if (len & 511)
		return -EINVAL;
	start >>= 9;
	len >>= 9;

	if (start + len > (i_size_read(bdev->bd_inode) >> 9))
		return -EINVAL;
	if (secure)
		flags |= BLKDEV_DISCARD_SECURE;
	return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
}

static int put_ushort(unsigned long arg, unsigned short val)
{
	return put_user(val, (unsigned short __user *)arg);
}

static int put_int(unsigned long arg, int val)
{
	return put_user(val, (int __user *)arg);
}

static int put_uint(unsigned long arg, unsigned int val)
{
	return put_user(val, (unsigned int __user *)arg);
}

static int put_long(unsigned long arg, long val)
{
	return put_user(val, (long __user *)arg);
}

static int put_ulong(unsigned long arg, unsigned long val)
{
	return put_user(val, (unsigned long __user *)arg);
}

static int put_u64(unsigned long arg, u64 val)
{
	return put_user(val, (u64 __user *)arg);
}

int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
			unsigned cmd, unsigned long arg)
{
	struct gendisk *disk = bdev->bd_disk;

	if (disk->fops->ioctl)
		return disk->fops->ioctl(bdev, mode, cmd, arg);

	return -ENOTTY;
}
/*
 * For the record: _GPL here is only because somebody decided to slap it
 * on the previous export.  Sheer idiocy, since it wasn't copyrightable
 * at all and could be open-coded without any exports by anybody who cares.
 */
EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);

/*
 * Is it an unrecognized ioctl? The correct returns are either
 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
 * code before returning.
 *
 * Confused drivers sometimes return EINVAL, which is wrong. It
 * means "I understood the ioctl command, but the parameters to
 * it were wrong".
 *
 * We should aim to just fix the broken drivers, the EINVAL case
 * should go away.
 */
static inline int is_unrecognized_ioctl(int ret)
{
	return	ret == -EINVAL ||
		ret == -ENOTTY ||
		ret == -ENOIOCTLCMD;
}

/*
 * always keep this in sync with compat_blkdev_ioctl()
 */
int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
			unsigned long arg)
{
	struct gendisk *disk = bdev->bd_disk;
	struct backing_dev_info *bdi;
	loff_t size;
	int ret, n;

	switch(cmd) {
	case BLKFLSBUF:
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;

		ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
		if (!is_unrecognized_ioctl(ret))
			return ret;

		fsync_bdev(bdev);
		invalidate_bdev(bdev);
		return 0;

	case BLKROSET:
		ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
		if (!is_unrecognized_ioctl(ret))
			return ret;
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		if (get_user(n, (int __user *)(arg)))
			return -EFAULT;
		set_device_ro(bdev, n);
		return 0;

	case BLKDISCARD:
	case BLKSECDISCARD: {
		uint64_t range[2];

		if (!(mode & FMODE_WRITE))
			return -EBADF;

		if (copy_from_user(range, (void __user *)arg, sizeof(range)))
			return -EFAULT;

		return blk_ioctl_discard(bdev, range[0], range[1],
					 cmd == BLKSECDISCARD);
	}

	case HDIO_GETGEO: {
		struct hd_geometry geo;

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

		/*
		 * We need to set the startsect first, the driver may
		 * want to override it.
		 */
		memset(&geo, 0, sizeof(geo));
		geo.start = get_start_sect(bdev);
		ret = disk->fops->getgeo(bdev, &geo);
		if (ret)
			return ret;
		if (copy_to_user((struct hd_geometry __user *)arg, &geo,
					sizeof(geo)))
			return -EFAULT;
		return 0;
	}
	case BLKRAGET:
	case BLKFRAGET:
		if (!arg)
			return -EINVAL;
		bdi = blk_get_backing_dev_info(bdev);
		if (bdi == NULL)
			return -ENOTTY;
		return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	case BLKROGET:
		return put_int(arg, bdev_read_only(bdev) != 0);
	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
		return put_int(arg, block_size(bdev));
	case BLKSSZGET: /* get block device logical block size */
		return put_int(arg, bdev_logical_block_size(bdev));
	case BLKPBSZGET: /* get block device physical block size */
		return put_uint(arg, bdev_physical_block_size(bdev));
	case BLKIOMIN:
		return put_uint(arg, bdev_io_min(bdev));
	case BLKIOOPT:
		return put_uint(arg, bdev_io_opt(bdev));
	case BLKALIGNOFF:
		return put_int(arg, bdev_alignment_offset(bdev));
	case BLKDISCARDZEROES:
		return put_uint(arg, bdev_discard_zeroes_data(bdev));
	case BLKSECTGET:
		return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
	case BLKROTATIONAL:
		return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
	case BLKRASET:
	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 BLKBSZSET:
		/* set the logical block size */
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		if (!arg)
			return -EINVAL;
		if (get_user(n, (int __user *) arg))
			return -EFAULT;
		if (!(mode & FMODE_EXCL)) {
			bdgrab(bdev);
			if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
				return -EBUSY;
		}
		ret = set_blocksize(bdev, n);
		if (!(mode & FMODE_EXCL))
			blkdev_put(bdev, mode | FMODE_EXCL);
		return ret;
	case BLKPG:
		ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
		break;
	case BLKRRPART:
		ret = blkdev_reread_part(bdev);
		break;
	case BLKGETSIZE:
		size = i_size_read(bdev->bd_inode);
		if ((size >> 9) > ~0UL)
			return -EFBIG;
		return put_ulong(arg, size >> 9);
	case BLKGETSIZE64:
		return put_u64(arg, i_size_read(bdev->bd_inode));
	case BLKTRACESTART:
	case BLKTRACESTOP:
	case BLKTRACESETUP:
	case BLKTRACETEARDOWN:
		ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
		break;
	default:
		ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
	}
	return ret;
}
EXPORT_SYMBOL_GPL(blkdev_ioctl);
Commit	Line	Data
c59ede7b	1	#include <linux/capability.h>
1da177e4	2	#include <linux/blkdev.h>
d5decd3b	3	#include <linux/export.h>
5a0e3ad6	4	#include <linux/gfp.h>
1da177e4	5	#include <linux/blkpg.h>
a885c8c4	6	#include <linux/hdreg.h>
1da177e4	7	#include <linux/backing-dev.h>
ff01bb48	8	#include <linux/fs.h>
2056a782	9	#include <linux/blktrace_api.h>
1da177e4 LT	10	#include <asm/uaccess.h>
	11
	12	static int blkpg_ioctl(struct block_device bdev, struct blkpg_ioctl_arg __user arg)
	13	{
	14	struct block_device *bdevp;
	15	struct gendisk *disk;
e71bf0d0	16	struct hd_struct *part;
1da177e4 LT	17	struct blkpg_ioctl_arg a;
1da177e4 LT	18	struct blkpg_partition p;
e71bf0d0	19	struct disk_part_iter piter;
1da177e4	20	long long start, length;
cf771cb5	21	int partno;
1da177e4 LT	22
	23	if (!capable(CAP_SYS_ADMIN))
	24	return -EACCES;
	25	if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
	26	return -EFAULT;
	27	if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
	28	return -EFAULT;
	29	disk = bdev->bd_disk;
	30	if (bdev != bdev->bd_contains)
	31	return -EINVAL;
cf771cb5	32	partno = p.pno;
540eed56	33	if (partno <= 0)
1da177e4 LT	34	return -EINVAL;
	35	switch (a.op) {
	36	case BLKPG_ADD_PARTITION:
	37	start = p.start >> 9;
	38	length = p.length >> 9;
	39	/* check for fit in a hd_struct */
	40	if (sizeof(sector_t) == sizeof(long) &&
	41	sizeof(long long) > sizeof(long)) {
	42	long pstart = start, plength = length;
	43	if (pstart != start \|\| plength != length
	44	\|\| pstart < 0 \|\| plength < 0)
	45	return -EINVAL;
	46	}
88e34126	47
c039e313	48	mutex_lock(&bdev->bd_mutex);
88e34126	49
1da177e4	50	/* overlap? */
e71bf0d0 TH	51	disk_part_iter_init(&piter, disk,
	52	DISK_PITER_INCL_EMPTY);
	53	while ((part = disk_part_iter_next(&piter))) {
	54	if (!(start + length <= part->start_sect \|\|
	55	start >= part->start_sect + part->nr_sects)) {
	56	disk_part_iter_exit(&piter);
c039e313	57	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	58	return -EBUSY;
	59	}
	60	}
e71bf0d0 TH	61	disk_part_iter_exit(&piter);
e71bf0d0 TH	62
1da177e4	63	/* all seems OK */
ba32929a	64	part = add_partition(disk, partno, start, length,
6d1d8050	65	ADDPART_FLAG_NONE, NULL);
c039e313	66	mutex_unlock(&bdev->bd_mutex);
ba32929a	67	return IS_ERR(part) ? PTR_ERR(part) : 0;
1da177e4	68	case BLKPG_DEL_PARTITION:
e71bf0d0 TH	69	part = disk_get_part(disk, partno);
e71bf0d0 TH	70	if (!part)
1da177e4	71	return -ENXIO;
e71bf0d0 TH	72
	73	bdevp = bdget(part_devt(part));
	74	disk_put_part(part);
1da177e4 LT	75	if (!bdevp)
1da177e4 LT	76	return -ENOMEM;
e71bf0d0	77
2e7b651d	78	mutex_lock(&bdevp->bd_mutex);
1da177e4	79	if (bdevp->bd_openers) {
c039e313	80	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	81	bdput(bdevp);
	82	return -EBUSY;
	83	}
	84	/* all seems OK */
	85	fsync_bdev(bdevp);
f98393a6	86	invalidate_bdev(bdevp);
1da177e4	87
6d740cd5	88	mutex_lock_nested(&bdev->bd_mutex, 1);
cf771cb5	89	delete_partition(disk, partno);
c039e313 AV	90	mutex_unlock(&bdev->bd_mutex);
c039e313 AV	91	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	92	bdput(bdevp);
	93
	94	return 0;
	95	default:
	96	return -EINVAL;
	97	}
	98	}
	99
	100	static int blkdev_reread_part(struct block_device *bdev)
	101	{
	102	struct gendisk *disk = bdev->bd_disk;
	103	int res;
	104
d27769ec	105	if (!disk_part_scan_enabled(disk) \|\| bdev != bdev->bd_contains)
1da177e4 LT	106	return -EINVAL;
	107	if (!capable(CAP_SYS_ADMIN))
	108	return -EACCES;
c039e313	109	if (!mutex_trylock(&bdev->bd_mutex))
1da177e4 LT	110	return -EBUSY;
1da177e4 LT	111	res = rescan_partitions(disk, bdev);
c039e313	112	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	113	return res;
	114	}
	115
d30a2605	116	static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
8d57a98c	117	uint64_t len, int secure)
d30a2605	118	{
dd3932ed	119	unsigned long flags = 0;
8d57a98c	120
d30a2605 DW	121	if (start & 511)
	122	return -EINVAL;
	123	if (len & 511)
	124	return -EINVAL;
	125	start >>= 9;
	126	len >>= 9;
	127
77304d2a	128	if (start + len > (i_size_read(bdev->bd_inode) >> 9))
d30a2605	129	return -EINVAL;
8d57a98c	130	if (secure)
dd3932ed	131	flags \|= BLKDEV_DISCARD_SECURE;
8d57a98c	132	return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
d30a2605 DW	133	}
d30a2605 DW	134
1da177e4 LT	135	static int put_ushort(unsigned long arg, unsigned short val)
	136	{
	137	return put_user(val, (unsigned short __user *)arg);
	138	}
	139
	140	static int put_int(unsigned long arg, int val)
	141	{
	142	return put_user(val, (int __user *)arg);
	143	}
	144
ac481c20 MP	145	static int put_uint(unsigned long arg, unsigned int val)
	146	{
	147	return put_user(val, (unsigned int __user *)arg);
	148	}
	149
1da177e4 LT	150	static int put_long(unsigned long arg, long val)
	151	{
	152	return put_user(val, (long __user *)arg);
	153	}
	154
	155	static int put_ulong(unsigned long arg, unsigned long val)
	156	{
	157	return put_user(val, (unsigned long __user *)arg);
	158	}
	159
	160	static int put_u64(unsigned long arg, u64 val)
	161	{
	162	return put_user(val, (u64 __user *)arg);
	163	}
	164
633a08b8 AV	165	int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
	166	unsigned cmd, unsigned long arg)
	167	{
	168	struct gendisk *disk = bdev->bd_disk;
d4430d62 AV	169
	170	if (disk->fops->ioctl)
	171	return disk->fops->ioctl(bdev, mode, cmd, arg);
633a08b8	172
633a08b8 AV	173	return -ENOTTY;
	174	}
	175	/*
	176	* For the record: _GPL here is only because somebody decided to slap it
	177	* on the previous export. Sheer idiocy, since it wasn't copyrightable
	178	* at all and could be open-coded without any exports by anybody who cares.
	179	*/
	180	EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
	181
07d106d0 LT	182	/*
	183	* Is it an unrecognized ioctl? The correct returns are either
	184	* ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
	185	* fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
	186	* code before returning.
	187	*
	188	* Confused drivers sometimes return EINVAL, which is wrong. It
	189	* means "I understood the ioctl command, but the parameters to
	190	* it were wrong".
	191	*
	192	* We should aim to just fix the broken drivers, the EINVAL case
	193	* should go away.
	194	*/
	195	static inline int is_unrecognized_ioctl(int ret)
	196	{
	197	return ret == -EINVAL \|\|
	198	ret == -ENOTTY \|\|
	199	ret == -ENOIOCTLCMD;
	200	}
	201
f58c4c0a	202	/*
8a6cfeb6	203	* always keep this in sync with compat_blkdev_ioctl()
f58c4c0a	204	*/
56b26add	205	int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
bb93e3a5 AB	206	unsigned long arg)
bb93e3a5 AB	207	{
bb93e3a5	208	struct gendisk *disk = bdev->bd_disk;
45048d09 AV	209	struct backing_dev_info *bdi;
45048d09 AV	210	loff_t size;
bb93e3a5 AB	211	int ret, n;
	212
	213	switch(cmd) {
1da177e4 LT	214	case BLKFLSBUF:
	215	if (!capable(CAP_SYS_ADMIN))
	216	return -EACCES;
bb93e3a5	217
e436fdae	218	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
07d106d0	219	if (!is_unrecognized_ioctl(ret))
bb93e3a5 AB	220	return ret;
bb93e3a5 AB	221
1da177e4	222	fsync_bdev(bdev);
f98393a6	223	invalidate_bdev(bdev);
1da177e4	224	return 0;
bb93e3a5	225
1da177e4	226	case BLKROSET:
e436fdae	227	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
07d106d0	228	if (!is_unrecognized_ioctl(ret))
bb93e3a5	229	return ret;
1da177e4 LT	230	if (!capable(CAP_SYS_ADMIN))
	231	return -EACCES;
	232	if (get_user(n, (int __user *)(arg)))
	233	return -EFAULT;
	234	set_device_ro(bdev, n);
	235	return 0;
d30a2605	236
8d57a98c AH	237	case BLKDISCARD:
8d57a98c AH	238	case BLKSECDISCARD: {
d30a2605 DW	239	uint64_t range[2];
d30a2605 DW	240
e436fdae	241	if (!(mode & FMODE_WRITE))
d30a2605 DW	242	return -EBADF;
	243
	244	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
	245	return -EFAULT;
	246
8d57a98c AH	247	return blk_ioctl_discard(bdev, range[0], range[1],
8d57a98c AH	248	cmd == BLKSECDISCARD);
d30a2605 DW	249	}
d30a2605 DW	250
a885c8c4 CH	251	case HDIO_GETGEO: {
	252	struct hd_geometry geo;
	253
	254	if (!arg)
	255	return -EINVAL;
	256	if (!disk->fops->getgeo)
	257	return -ENOTTY;
	258
	259	/*
	260	* We need to set the startsect first, the driver may
	261	* want to override it.
	262	*/
a014741c	263	memset(&geo, 0, sizeof(geo));
a885c8c4 CH	264	geo.start = get_start_sect(bdev);
	265	ret = disk->fops->getgeo(bdev, &geo);
	266	if (ret)
	267	return ret;
	268	if (copy_to_user((struct hd_geometry __user *)arg, &geo,
	269	sizeof(geo)))
	270	return -EFAULT;
	271	return 0;
	272	}
45048d09 AV	273	case BLKRAGET:
	274	case BLKFRAGET:
	275	if (!arg)
	276	return -EINVAL;
	277	bdi = blk_get_backing_dev_info(bdev);
	278	if (bdi == NULL)
	279	return -ENOTTY;
	280	return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	281	case BLKROGET:
	282	return put_int(arg, bdev_read_only(bdev) != 0);
ac481c20	283	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
45048d09	284	return put_int(arg, block_size(bdev));
ac481c20	285	case BLKSSZGET: /* get block device logical block size */
e1defc4f	286	return put_int(arg, bdev_logical_block_size(bdev));
ac481c20 MP	287	case BLKPBSZGET: /* get block device physical block size */
	288	return put_uint(arg, bdev_physical_block_size(bdev));
	289	case BLKIOMIN:
	290	return put_uint(arg, bdev_io_min(bdev));
	291	case BLKIOOPT:
	292	return put_uint(arg, bdev_io_opt(bdev));
	293	case BLKALIGNOFF:
	294	return put_int(arg, bdev_alignment_offset(bdev));
98262f27 MP	295	case BLKDISCARDZEROES:
98262f27 MP	296	return put_uint(arg, bdev_discard_zeroes_data(bdev));
45048d09	297	case BLKSECTGET:
ae03bf63	298	return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
ef00f59c MP	299	case BLKROTATIONAL:
ef00f59c MP	300	return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
45048d09 AV	301	case BLKRASET:
	302	case BLKFRASET:
	303	if(!capable(CAP_SYS_ADMIN))
	304	return -EACCES;
	305	bdi = blk_get_backing_dev_info(bdev);
	306	if (bdi == NULL)
	307	return -ENOTTY;
45048d09	308	bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
45048d09 AV	309	return 0;
	310	case BLKBSZSET:
	311	/* set the logical block size */
	312	if (!capable(CAP_SYS_ADMIN))
	313	return -EACCES;
	314	if (!arg)
	315	return -EINVAL;
	316	if (get_user(n, (int __user *) arg))
	317	return -EFAULT;
3c522ced MS	318	if (!(mode & FMODE_EXCL)) {
	319	bdgrab(bdev);
	320	if (blkdev_get(bdev, mode \| FMODE_EXCL, &bdev) < 0)
	321	return -EBUSY;
	322	}
45048d09	323	ret = set_blocksize(bdev, n);
6af3a56e	324	if (!(mode & FMODE_EXCL))
e525fd89	325	blkdev_put(bdev, mode \| FMODE_EXCL);
bb93e3a5	326	return ret;
45048d09	327	case BLKPG:
45048d09	328	ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
45048d09 AV	329	break;
45048d09 AV	330	case BLKRRPART:
45048d09	331	ret = blkdev_reread_part(bdev);
45048d09 AV	332	break;
45048d09 AV	333	case BLKGETSIZE:
77304d2a	334	size = i_size_read(bdev->bd_inode);
45048d09 AV	335	if ((size >> 9) > ~0UL)
	336	return -EFBIG;
	337	return put_ulong(arg, size >> 9);
	338	case BLKGETSIZE64:
77304d2a	339	return put_u64(arg, i_size_read(bdev->bd_inode));
45048d09 AV	340	case BLKTRACESTART:
	341	case BLKTRACESTOP:
	342	case BLKTRACESETUP:
	343	case BLKTRACETEARDOWN:
45048d09	344	ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
45048d09 AV	345	break;
	346	default:
	347	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
	348	}
	349	return ret;
1da177e4	350	}
68f66feb	351	EXPORT_SYMBOL_GPL(blkdev_ioctl);