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

#include <linux/capability.h>
#include <linux/blkdev.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 blkpg_ioctl_arg a;
	struct blkpg_partition p;
	long long start, length;
	int part;
	int i;

	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;
	part = p.pno;
	if (part <= 0 || part >= disk->minors)
		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;
			}
			/* partition number in use? */
			mutex_lock(&bdev->bd_mutex);
			if (disk->part[part - 1]) {
				mutex_unlock(&bdev->bd_mutex);
				return -EBUSY;
			}
			/* overlap? */
			for (i = 0; i < disk->minors - 1; i++) {
				struct hd_struct *s = disk->part[i];

				if (!s)
					continue;
				if (!(start+length <= s->start_sect ||
				      start >= s->start_sect + s->nr_sects)) {
					mutex_unlock(&bdev->bd_mutex);
					return -EBUSY;
				}
			}
			/* all seems OK */
			add_partition(disk, part, start, length);
			mutex_unlock(&bdev->bd_mutex);
			return 0;
		case BLKPG_DEL_PARTITION:
			if (!disk->part[part-1])
				return -ENXIO;
			if (disk->part[part - 1]->nr_sects == 0)
				return -ENXIO;
			bdevp = bdget_disk(disk, 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, 0);

			mutex_lock(&bdev->bd_mutex);
			delete_partition(disk, part);
			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->minors == 1 || 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 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_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);
}

static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev,
				unsigned cmd, unsigned long arg)
{
	struct backing_dev_info *bdi;
	int ret, n;

	switch (cmd) {
	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 the logical block size (cf. BLKSSZGET) */
		return put_int(arg, block_size(bdev));
	case BLKSSZGET: /* get block device hardware sector size */
		return put_int(arg, bdev_hardsect_size(bdev));
	case BLKSECTGET:
		return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
	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 (bd_claim(bdev, file) < 0)
			return -EBUSY;
		ret = set_blocksize(bdev, n);
		bd_release(bdev);
		return ret;
	case BLKPG:
		return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
	case BLKRRPART:
		return blkdev_reread_part(bdev);
	case BLKGETSIZE:
		if ((bdev->bd_inode->i_size >> 9) > ~0UL)
			return -EFBIG;
		return put_ulong(arg, bdev->bd_inode->i_size >> 9);
	case BLKGETSIZE64:
		return put_u64(arg, bdev->bd_inode->i_size);
	case BLKTRACESTART:
	case BLKTRACESTOP:
	case BLKTRACESETUP:
	case BLKTRACETEARDOWN:
		return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
	}
	return -ENOIOCTLCMD;
}

int blkdev_driver_ioctl(struct inode *inode, struct file *file,
			struct gendisk *disk, unsigned cmd, unsigned long arg)
{
	int ret;
	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;
}
EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);

int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
			unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	struct gendisk *disk = bdev->bd_disk;
	int ret, n;

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

		ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
		/* -EINVAL to handle old uncorrected drivers */
		if (ret != -EINVAL && ret != -ENOTTY)
			return ret;

		lock_kernel();
		fsync_bdev(bdev);
		invalidate_bdev(bdev, 0);
		unlock_kernel();
		return 0;

	case BLKROSET:
		ret = blkdev_driver_ioctl(inode, file, disk, 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;
		lock_kernel();
		set_device_ro(bdev, n);
		unlock_kernel();
		return 0;
	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.
		 */
		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;
	}
	}

	lock_kernel();
	ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
	unlock_kernel();
	if (ret != -ENOIOCTLCMD)
		return ret;

	return blkdev_driver_ioctl(inode, file, disk, 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)
{
	struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
	struct gendisk *disk = bdev->bd_disk;
	int ret = -ENOIOCTLCMD;
	if (disk->fops->compat_ioctl) {
		lock_kernel();
		ret = disk->fops->compat_ioctl(file, cmd, arg);
		unlock_kernel();
	}
	return ret;
}

EXPORT_SYMBOL_GPL(blkdev_ioctl);
Commit	Line	Data
c59ede7b	1	#include <linux/capability.h>
1da177e4 LT	2	#include <linux/blkdev.h>
1da177e4 LT	3	#include <linux/blkpg.h>
a885c8c4	4	#include <linux/hdreg.h>
1da177e4 LT	5	#include <linux/backing-dev.h>
	6	#include <linux/buffer_head.h>
	7	#include <linux/smp_lock.h>
2056a782	8	#include <linux/blktrace_api.h>
1da177e4 LT	9	#include <asm/uaccess.h>
	10
	11	static int blkpg_ioctl(struct block_device bdev, struct blkpg_ioctl_arg __user arg)
	12	{
	13	struct block_device *bdevp;
	14	struct gendisk *disk;
	15	struct blkpg_ioctl_arg a;
	16	struct blkpg_partition p;
	17	long long start, length;
	18	int part;
	19	int i;
	20
	21	if (!capable(CAP_SYS_ADMIN))
	22	return -EACCES;
	23	if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
	24	return -EFAULT;
	25	if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
	26	return -EFAULT;
	27	disk = bdev->bd_disk;
	28	if (bdev != bdev->bd_contains)
	29	return -EINVAL;
	30	part = p.pno;
	31	if (part <= 0 \|\| part >= disk->minors)
	32	return -EINVAL;
	33	switch (a.op) {
	34	case BLKPG_ADD_PARTITION:
	35	start = p.start >> 9;
	36	length = p.length >> 9;
	37	/* check for fit in a hd_struct */
	38	if (sizeof(sector_t) == sizeof(long) &&
	39	sizeof(long long) > sizeof(long)) {
	40	long pstart = start, plength = length;
	41	if (pstart != start \|\| plength != length
	42	\|\| pstart < 0 \|\| plength < 0)
	43	return -EINVAL;
	44	}
	45	/* partition number in use? */
c039e313	46	mutex_lock(&bdev->bd_mutex);
1da177e4	47	if (disk->part[part - 1]) {
c039e313	48	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	49	return -EBUSY;
	50	}
	51	/* overlap? */
	52	for (i = 0; i < disk->minors - 1; i++) {
	53	struct hd_struct *s = disk->part[i];
	54
	55	if (!s)
	56	continue;
	57	if (!(start+length <= s->start_sect \|\|
	58	start >= s->start_sect + s->nr_sects)) {
c039e313	59	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	60	return -EBUSY;
	61	}
	62	}
	63	/* all seems OK */
	64	add_partition(disk, part, start, length);
c039e313	65	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	66	return 0;
	67	case BLKPG_DEL_PARTITION:
	68	if (!disk->part[part-1])
	69	return -ENXIO;
	70	if (disk->part[part - 1]->nr_sects == 0)
	71	return -ENXIO;
	72	bdevp = bdget_disk(disk, part);
	73	if (!bdevp)
	74	return -ENOMEM;
2e7b651d	75	mutex_lock(&bdevp->bd_mutex);
1da177e4	76	if (bdevp->bd_openers) {
c039e313	77	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	78	bdput(bdevp);
	79	return -EBUSY;
	80	}
	81	/* all seems OK */
	82	fsync_bdev(bdevp);
	83	invalidate_bdev(bdevp, 0);
	84
2e7b651d	85	mutex_lock(&bdev->bd_mutex);
1da177e4	86	delete_partition(disk, part);
c039e313 AV	87	mutex_unlock(&bdev->bd_mutex);
c039e313 AV	88	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	89	bdput(bdevp);
	90
	91	return 0;
	92	default:
	93	return -EINVAL;
	94	}
	95	}
	96
	97	static int blkdev_reread_part(struct block_device *bdev)
	98	{
	99	struct gendisk *disk = bdev->bd_disk;
	100	int res;
	101
	102	if (disk->minors == 1 \|\| bdev != bdev->bd_contains)
	103	return -EINVAL;
	104	if (!capable(CAP_SYS_ADMIN))
	105	return -EACCES;
c039e313	106	if (!mutex_trylock(&bdev->bd_mutex))
1da177e4 LT	107	return -EBUSY;
1da177e4 LT	108	res = rescan_partitions(disk, bdev);
c039e313	109	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	110	return res;
	111	}
	112
	113	static int put_ushort(unsigned long arg, unsigned short val)
	114	{
	115	return put_user(val, (unsigned short __user *)arg);
	116	}
	117
	118	static int put_int(unsigned long arg, int val)
	119	{
	120	return put_user(val, (int __user *)arg);
	121	}
	122
	123	static int put_long(unsigned long arg, long val)
	124	{
	125	return put_user(val, (long __user *)arg);
	126	}
	127
	128	static int put_ulong(unsigned long arg, unsigned long val)
	129	{
	130	return put_user(val, (unsigned long __user *)arg);
	131	}
	132
	133	static int put_u64(unsigned long arg, u64 val)
	134	{
	135	return put_user(val, (u64 __user *)arg);
	136	}
	137
bb93e3a5 AB	138	static int blkdev_locked_ioctl(struct file file, struct block_device bdev,
bb93e3a5 AB	139	unsigned cmd, unsigned long arg)
1da177e4	140	{
1da177e4 LT	141	struct backing_dev_info *bdi;
	142	int ret, n;
	143
	144	switch (cmd) {
	145	case BLKRAGET:
	146	case BLKFRAGET:
	147	if (!arg)
	148	return -EINVAL;
	149	bdi = blk_get_backing_dev_info(bdev);
	150	if (bdi == NULL)
	151	return -ENOTTY;
	152	return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	153	case BLKROGET:
	154	return put_int(arg, bdev_read_only(bdev) != 0);
	155	case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
	156	return put_int(arg, block_size(bdev));
	157	case BLKSSZGET: /* get block device hardware sector size */
	158	return put_int(arg, bdev_hardsect_size(bdev));
	159	case BLKSECTGET:
	160	return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
	161	case BLKRASET:
	162	case BLKFRASET:
	163	if(!capable(CAP_SYS_ADMIN))
	164	return -EACCES;
	165	bdi = blk_get_backing_dev_info(bdev);
	166	if (bdi == NULL)
	167	return -ENOTTY;
	168	bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
	169	return 0;
	170	case BLKBSZSET:
	171	/* set the logical block size */
	172	if (!capable(CAP_SYS_ADMIN))
	173	return -EACCES;
	174	if (!arg)
	175	return -EINVAL;
	176	if (get_user(n, (int __user *) arg))
	177	return -EFAULT;
	178	if (bd_claim(bdev, file) < 0)
	179	return -EBUSY;
	180	ret = set_blocksize(bdev, n);
	181	bd_release(bdev);
	182	return ret;
	183	case BLKPG:
	184	return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
	185	case BLKRRPART:
	186	return blkdev_reread_part(bdev);
	187	case BLKGETSIZE:
	188	if ((bdev->bd_inode->i_size >> 9) > ~0UL)
	189	return -EFBIG;
	190	return put_ulong(arg, bdev->bd_inode->i_size >> 9);
	191	case BLKGETSIZE64:
	192	return put_u64(arg, bdev->bd_inode->i_size);
2056a782 JA	193	case BLKTRACESTART:
	194	case BLKTRACESTOP:
	195	case BLKTRACESETUP:
	196	case BLKTRACETEARDOWN:
	197	return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
bb93e3a5 AB	198	}
	199	return -ENOIOCTLCMD;
	200	}
	201
7006f6ec AK	202	int blkdev_driver_ioctl(struct inode inode, struct file file,
7006f6ec AK	203	struct gendisk *disk, unsigned cmd, unsigned long arg)
bb93e3a5 AB	204	{
	205	int ret;
	206	if (disk->fops->unlocked_ioctl)
	207	return disk->fops->unlocked_ioctl(file, cmd, arg);
	208
	209	if (disk->fops->ioctl) {
	210	lock_kernel();
	211	ret = disk->fops->ioctl(inode, file, cmd, arg);
	212	unlock_kernel();
	213	return ret;
	214	}
	215
	216	return -ENOTTY;
	217	}
7006f6ec	218	EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
bb93e3a5 AB	219
	220	int blkdev_ioctl(struct inode inode, struct file file, unsigned cmd,
	221	unsigned long arg)
	222	{
	223	struct block_device *bdev = inode->i_bdev;
	224	struct gendisk *disk = bdev->bd_disk;
	225	int ret, n;
	226
	227	switch(cmd) {
1da177e4 LT	228	case BLKFLSBUF:
	229	if (!capable(CAP_SYS_ADMIN))
	230	return -EACCES;
bb93e3a5 AB	231
	232	ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
	233	/* -EINVAL to handle old uncorrected drivers */
	234	if (ret != -EINVAL && ret != -ENOTTY)
	235	return ret;
	236
	237	lock_kernel();
1da177e4 LT	238	fsync_bdev(bdev);
1da177e4 LT	239	invalidate_bdev(bdev, 0);
bb93e3a5	240	unlock_kernel();
1da177e4	241	return 0;
bb93e3a5	242
1da177e4	243	case BLKROSET:
bb93e3a5 AB	244	ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
	245	/* -EINVAL to handle old uncorrected drivers */
	246	if (ret != -EINVAL && ret != -ENOTTY)
	247	return ret;
1da177e4 LT	248	if (!capable(CAP_SYS_ADMIN))
	249	return -EACCES;
	250	if (get_user(n, (int __user *)(arg)))
	251	return -EFAULT;
bb93e3a5	252	lock_kernel();
1da177e4	253	set_device_ro(bdev, n);
bb93e3a5	254	unlock_kernel();
1da177e4	255	return 0;
a885c8c4 CH	256	case HDIO_GETGEO: {
	257	struct hd_geometry geo;
	258
	259	if (!arg)
	260	return -EINVAL;
	261	if (!disk->fops->getgeo)
	262	return -ENOTTY;
	263
	264	/*
	265	* We need to set the startsect first, the driver may
	266	* want to override it.
	267	*/
	268	geo.start = get_start_sect(bdev);
	269	ret = disk->fops->getgeo(bdev, &geo);
	270	if (ret)
	271	return ret;
	272	if (copy_to_user((struct hd_geometry __user *)arg, &geo,
	273	sizeof(geo)))
	274	return -EFAULT;
	275	return 0;
	276	}
1da177e4	277	}
bb93e3a5 AB	278
	279	lock_kernel();
	280	ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
	281	unlock_kernel();
	282	if (ret != -ENOIOCTLCMD)
	283	return ret;
	284
	285	return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
1da177e4 LT	286	}
	287
	288	/* Most of the generic ioctls are handled in the normal fallback path.
	289	This assumes the blkdev's low level compat_ioctl always returns
	290	ENOIOCTLCMD for unknown ioctls. */
	291	long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
	292	{
c5a20b6c	293	struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
1da177e4 LT	294	struct gendisk *disk = bdev->bd_disk;
	295	int ret = -ENOIOCTLCMD;
	296	if (disk->fops->compat_ioctl) {
	297	lock_kernel();
	298	ret = disk->fops->compat_ioctl(file, cmd, arg);
	299	unlock_kernel();
	300	}
	301	return ret;
	302	}
68f66feb ST	303
68f66feb ST	304	EXPORT_SYMBOL_GPL(blkdev_ioctl);