[net-next-2.6.git] / block / ioctl.c

#include <linux/capability.h>
#include <linux/blkdev.h>
#include <linux/gfp.h>
#include <linux/blkpg.h>
#include <linux/hdreg.h>
#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
#include <linux/smp_lock.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_partitionable(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);

/*
 * 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);
		/* -EINVAL to handle old uncorrected drivers */
		if (ret != -EINVAL && ret != -ENOTTY)
			return ret;

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

	case BLKROSET:
		ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
		/* -EINVAL to handle old uncorrected drivers */
		if (ret != -EINVAL && ret != -ENOTTY)
			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 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) && bd_claim(bdev, &bdev) < 0)
			return -EBUSY;
		ret = set_blocksize(bdev, n);
		if (!(mode & FMODE_EXCL))
			bd_release(bdev);
		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
	1	#include <linux/capability.h>
	2	#include <linux/blkdev.h>
	3	#include <linux/gfp.h>
	4	#include <linux/blkpg.h>
	5	#include <linux/hdreg.h>
	6	#include <linux/backing-dev.h>
	7	#include <linux/buffer_head.h>
	8	#include <linux/smp_lock.h>
	9	#include <linux/blktrace_api.h>
	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;
	16	struct hd_struct *part;
	17	struct blkpg_ioctl_arg a;
	18	struct blkpg_partition p;
	19	struct disk_part_iter piter;
	20	long long start, length;
	21	int partno;
	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;
	32	partno = p.pno;
	33	if (partno <= 0)
	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	}
	47
	48	mutex_lock(&bdev->bd_mutex);
	49
	50	/* overlap? */
	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);
	57	mutex_unlock(&bdev->bd_mutex);
	58	return -EBUSY;
	59	}
	60	}
	61	disk_part_iter_exit(&piter);
	62
	63	/* all seems OK */
	64	part = add_partition(disk, partno, start, length,
	65	ADDPART_FLAG_NONE, NULL);
	66	mutex_unlock(&bdev->bd_mutex);
	67	return IS_ERR(part) ? PTR_ERR(part) : 0;
	68	case BLKPG_DEL_PARTITION:
	69	part = disk_get_part(disk, partno);
	70	if (!part)
	71	return -ENXIO;
	72
	73	bdevp = bdget(part_devt(part));
	74	disk_put_part(part);
	75	if (!bdevp)
	76	return -ENOMEM;
	77
	78	mutex_lock(&bdevp->bd_mutex);
	79	if (bdevp->bd_openers) {
	80	mutex_unlock(&bdevp->bd_mutex);
	81	bdput(bdevp);
	82	return -EBUSY;
	83	}
	84	/* all seems OK */
	85	fsync_bdev(bdevp);
	86	invalidate_bdev(bdevp);
	87
	88	mutex_lock_nested(&bdev->bd_mutex, 1);
	89	delete_partition(disk, partno);
	90	mutex_unlock(&bdev->bd_mutex);
	91	mutex_unlock(&bdevp->bd_mutex);
	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
	105	if (!disk_partitionable(disk) \|\| bdev != bdev->bd_contains)
	106	return -EINVAL;
	107	if (!capable(CAP_SYS_ADMIN))
	108	return -EACCES;
	109	if (!mutex_trylock(&bdev->bd_mutex))
	110	return -EBUSY;
	111	res = rescan_partitions(disk, bdev);
	112	mutex_unlock(&bdev->bd_mutex);
	113	return res;
	114	}
	115
	116	static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
	117	uint64_t len, int secure)
	118	{
	119	unsigned long flags = 0;
	120
	121	if (start & 511)
	122	return -EINVAL;
	123	if (len & 511)
	124	return -EINVAL;
	125	start >>= 9;
	126	len >>= 9;
	127
	128	if (start + len > (i_size_read(bdev->bd_inode) >> 9))
	129	return -EINVAL;
	130	if (secure)
	131	flags \|= BLKDEV_DISCARD_SECURE;
	132	return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
	133	}
	134
	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
	145	static int put_uint(unsigned long arg, unsigned int val)
	146	{
	147	return put_user(val, (unsigned int __user *)arg);
	148	}
	149
	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
	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;
	169
	170	if (disk->fops->ioctl)
	171	return disk->fops->ioctl(bdev, mode, cmd, arg);
	172
	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
	182	/*
	183	* always keep this in sync with compat_blkdev_ioctl()
	184	*/
	185	int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
	186	unsigned long arg)
	187	{
	188	struct gendisk *disk = bdev->bd_disk;
	189	struct backing_dev_info *bdi;
	190	loff_t size;
	191	int ret, n;
	192
	193	switch(cmd) {
	194	case BLKFLSBUF:
	195	if (!capable(CAP_SYS_ADMIN))
	196	return -EACCES;
	197
	198	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
	199	/* -EINVAL to handle old uncorrected drivers */
	200	if (ret != -EINVAL && ret != -ENOTTY)
	201	return ret;
	202
	203	fsync_bdev(bdev);
	204	invalidate_bdev(bdev);
	205	return 0;
	206
	207	case BLKROSET:
	208	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
	209	/* -EINVAL to handle old uncorrected drivers */
	210	if (ret != -EINVAL && ret != -ENOTTY)
	211	return ret;
	212	if (!capable(CAP_SYS_ADMIN))
	213	return -EACCES;
	214	if (get_user(n, (int __user *)(arg)))
	215	return -EFAULT;
	216	set_device_ro(bdev, n);
	217	return 0;
	218
	219	case BLKDISCARD:
	220	case BLKSECDISCARD: {
	221	uint64_t range[2];
	222
	223	if (!(mode & FMODE_WRITE))
	224	return -EBADF;
	225
	226	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
	227	return -EFAULT;
	228
	229	return blk_ioctl_discard(bdev, range[0], range[1],
	230	cmd == BLKSECDISCARD);
	231	}
	232
	233	case HDIO_GETGEO: {
	234	struct hd_geometry geo;
	235
	236	if (!arg)
	237	return -EINVAL;
	238	if (!disk->fops->getgeo)
	239	return -ENOTTY;
	240
	241	/*
	242	* We need to set the startsect first, the driver may
	243	* want to override it.
	244	*/
	245	memset(&geo, 0, sizeof(geo));
	246	geo.start = get_start_sect(bdev);
	247	ret = disk->fops->getgeo(bdev, &geo);
	248	if (ret)
	249	return ret;
	250	if (copy_to_user((struct hd_geometry __user *)arg, &geo,
	251	sizeof(geo)))
	252	return -EFAULT;
	253	return 0;
	254	}
	255	case BLKRAGET:
	256	case BLKFRAGET:
	257	if (!arg)
	258	return -EINVAL;
	259	bdi = blk_get_backing_dev_info(bdev);
	260	if (bdi == NULL)
	261	return -ENOTTY;
	262	return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	263	case BLKROGET:
	264	return put_int(arg, bdev_read_only(bdev) != 0);
	265	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
	266	return put_int(arg, block_size(bdev));
	267	case BLKSSZGET: /* get block device logical block size */
	268	return put_int(arg, bdev_logical_block_size(bdev));
	269	case BLKPBSZGET: /* get block device physical block size */
	270	return put_uint(arg, bdev_physical_block_size(bdev));
	271	case BLKIOMIN:
	272	return put_uint(arg, bdev_io_min(bdev));
	273	case BLKIOOPT:
	274	return put_uint(arg, bdev_io_opt(bdev));
	275	case BLKALIGNOFF:
	276	return put_int(arg, bdev_alignment_offset(bdev));
	277	case BLKDISCARDZEROES:
	278	return put_uint(arg, bdev_discard_zeroes_data(bdev));
	279	case BLKSECTGET:
	280	return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
	281	case BLKRASET:
	282	case BLKFRASET:
	283	if(!capable(CAP_SYS_ADMIN))
	284	return -EACCES;
	285	bdi = blk_get_backing_dev_info(bdev);
	286	if (bdi == NULL)
	287	return -ENOTTY;
	288	bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
	289	return 0;
	290	case BLKBSZSET:
	291	/* set the logical block size */
	292	if (!capable(CAP_SYS_ADMIN))
	293	return -EACCES;
	294	if (!arg)
	295	return -EINVAL;
	296	if (get_user(n, (int __user *) arg))
	297	return -EFAULT;
	298	if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
	299	return -EBUSY;
	300	ret = set_blocksize(bdev, n);
	301	if (!(mode & FMODE_EXCL))
	302	bd_release(bdev);
	303	return ret;
	304	case BLKPG:
	305	ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
	306	break;
	307	case BLKRRPART:
	308	ret = blkdev_reread_part(bdev);
	309	break;
	310	case BLKGETSIZE:
	311	size = i_size_read(bdev->bd_inode);
	312	if ((size >> 9) > ~0UL)
	313	return -EFBIG;
	314	return put_ulong(arg, size >> 9);
	315	case BLKGETSIZE64:
	316	return put_u64(arg, i_size_read(bdev->bd_inode));
	317	case BLKTRACESTART:
	318	case BLKTRACESTOP:
	319	case BLKTRACESETUP:
	320	case BLKTRACETEARDOWN:
	321	ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
	322	break;
	323	default:
	324	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
	325	}
	326	return ret;
	327	}
	328	EXPORT_SYMBOL_GPL(blkdev_ioctl);