[GitHub/mt8127/android_kernel_alcatel_ttab.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 <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? */
			down(&bdev->bd_sem);
			if (disk->part[part - 1]) {
				up(&bdev->bd_sem);
				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)) {
					up(&bdev->bd_sem);
					return -EBUSY;
				}
			}
			/* all seems OK */
			add_partition(disk, part, start, length);
			up(&bdev->bd_sem);
			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;
			down(&bdevp->bd_sem);
			if (bdevp->bd_openers) {
				up(&bdevp->bd_sem);
				bdput(bdevp);
				return -EBUSY;
			}
			/* all seems OK */
			fsync_bdev(bdevp);
			invalidate_bdev(bdevp, 0);

			down(&bdev->bd_sem);
			delete_partition(disk, part);
			up(&bdev->bd_sem);
			up(&bdevp->bd_sem);
			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 (down_trylock(&bdev->bd_sem))
		return -EBUSY;
	res = rescan_partitions(disk, bdev);
	up(&bdev->bd_sem);
	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);
	}
	return -ENOIOCTLCMD;
}

static 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;
}

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