[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 <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;
	int err;

	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 */
			err = add_partition(disk, part, start, length, ADDPART_FLAG_NONE);
			mutex_unlock(&bdev->bd_mutex);
			return err;
		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);

			mutex_lock_nested(&bdev->bd_mutex, 1);
			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);

/*
 * always keep this in sync with compat_blkdev_ioctl() and
 * compat_blkdev_locked_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);
		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);
}
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;
04ebd4ae	20	int err;
1da177e4 LT	21
	22	if (!capable(CAP_SYS_ADMIN))
	23	return -EACCES;
	24	if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
	25	return -EFAULT;
	26	if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
	27	return -EFAULT;
	28	disk = bdev->bd_disk;
	29	if (bdev != bdev->bd_contains)
	30	return -EINVAL;
	31	part = p.pno;
	32	if (part <= 0 \|\| part >= disk->minors)
	33	return -EINVAL;
	34	switch (a.op) {
	35	case BLKPG_ADD_PARTITION:
	36	start = p.start >> 9;
	37	length = p.length >> 9;
	38	/* check for fit in a hd_struct */
	39	if (sizeof(sector_t) == sizeof(long) &&
	40	sizeof(long long) > sizeof(long)) {
	41	long pstart = start, plength = length;
	42	if (pstart != start \|\| plength != length
	43	\|\| pstart < 0 \|\| plength < 0)
	44	return -EINVAL;
	45	}
	46	/* partition number in use? */
c039e313	47	mutex_lock(&bdev->bd_mutex);
1da177e4	48	if (disk->part[part - 1]) {
c039e313	49	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	50	return -EBUSY;
	51	}
	52	/* overlap? */
	53	for (i = 0; i < disk->minors - 1; i++) {
	54	struct hd_struct *s = disk->part[i];
	55
	56	if (!s)
	57	continue;
	58	if (!(start+length <= s->start_sect \|\|
	59	start >= s->start_sect + s->nr_sects)) {
c039e313	60	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	61	return -EBUSY;
	62	}
	63	}
	64	/* all seems OK */
04ebd4ae	65	err = add_partition(disk, part, start, length, ADDPART_FLAG_NONE);
c039e313	66	mutex_unlock(&bdev->bd_mutex);
04ebd4ae	67	return err;
1da177e4 LT	68	case BLKPG_DEL_PARTITION:
	69	if (!disk->part[part-1])
	70	return -ENXIO;
	71	if (disk->part[part - 1]->nr_sects == 0)
	72	return -ENXIO;
	73	bdevp = bdget_disk(disk, part);
	74	if (!bdevp)
	75	return -ENOMEM;
2e7b651d	76	mutex_lock(&bdevp->bd_mutex);
1da177e4	77	if (bdevp->bd_openers) {
c039e313	78	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	79	bdput(bdevp);
	80	return -EBUSY;
	81	}
	82	/* all seems OK */
	83	fsync_bdev(bdevp);
f98393a6	84	invalidate_bdev(bdevp);
1da177e4	85
6d740cd5	86	mutex_lock_nested(&bdev->bd_mutex, 1);
1da177e4	87	delete_partition(disk, part);
c039e313 AV	88	mutex_unlock(&bdev->bd_mutex);
c039e313 AV	89	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	90	bdput(bdevp);
	91
	92	return 0;
	93	default:
	94	return -EINVAL;
	95	}
	96	}
	97
	98	static int blkdev_reread_part(struct block_device *bdev)
	99	{
	100	struct gendisk *disk = bdev->bd_disk;
	101	int res;
	102
	103	if (disk->minors == 1 \|\| bdev != bdev->bd_contains)
	104	return -EINVAL;
	105	if (!capable(CAP_SYS_ADMIN))
	106	return -EACCES;
c039e313	107	if (!mutex_trylock(&bdev->bd_mutex))
1da177e4 LT	108	return -EBUSY;
1da177e4 LT	109	res = rescan_partitions(disk, bdev);
c039e313	110	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	111	return res;
	112	}
	113
	114	static int put_ushort(unsigned long arg, unsigned short val)
	115	{
	116	return put_user(val, (unsigned short __user *)arg);
	117	}
	118
	119	static int put_int(unsigned long arg, int val)
	120	{
	121	return put_user(val, (int __user *)arg);
	122	}
	123
	124	static int put_long(unsigned long arg, long val)
	125	{
	126	return put_user(val, (long __user *)arg);
	127	}
	128
	129	static int put_ulong(unsigned long arg, unsigned long val)
	130	{
	131	return put_user(val, (unsigned long __user *)arg);
	132	}
	133
	134	static int put_u64(unsigned long arg, u64 val)
	135	{
	136	return put_user(val, (u64 __user *)arg);
	137	}
	138
bb93e3a5 AB	139	static int blkdev_locked_ioctl(struct file file, struct block_device bdev,
bb93e3a5 AB	140	unsigned cmd, unsigned long arg)
1da177e4	141	{
1da177e4 LT	142	struct backing_dev_info *bdi;
	143	int ret, n;
	144
	145	switch (cmd) {
	146	case BLKRAGET:
	147	case BLKFRAGET:
	148	if (!arg)
	149	return -EINVAL;
	150	bdi = blk_get_backing_dev_info(bdev);
	151	if (bdi == NULL)
	152	return -ENOTTY;
	153	return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	154	case BLKROGET:
	155	return put_int(arg, bdev_read_only(bdev) != 0);
	156	case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
	157	return put_int(arg, block_size(bdev));
	158	case BLKSSZGET: /* get block device hardware sector size */
	159	return put_int(arg, bdev_hardsect_size(bdev));
	160	case BLKSECTGET:
	161	return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
	162	case BLKRASET:
	163	case BLKFRASET:
	164	if(!capable(CAP_SYS_ADMIN))
	165	return -EACCES;
	166	bdi = blk_get_backing_dev_info(bdev);
	167	if (bdi == NULL)
	168	return -ENOTTY;
	169	bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
	170	return 0;
	171	case BLKBSZSET:
	172	/* set the logical block size */
	173	if (!capable(CAP_SYS_ADMIN))
	174	return -EACCES;
	175	if (!arg)
	176	return -EINVAL;
	177	if (get_user(n, (int __user *) arg))
	178	return -EFAULT;
	179	if (bd_claim(bdev, file) < 0)
	180	return -EBUSY;
	181	ret = set_blocksize(bdev, n);
	182	bd_release(bdev);
	183	return ret;
	184	case BLKPG:
	185	return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
	186	case BLKRRPART:
	187	return blkdev_reread_part(bdev);
	188	case BLKGETSIZE:
	189	if ((bdev->bd_inode->i_size >> 9) > ~0UL)
	190	return -EFBIG;
	191	return put_ulong(arg, bdev->bd_inode->i_size >> 9);
	192	case BLKGETSIZE64:
	193	return put_u64(arg, bdev->bd_inode->i_size);
2056a782 JA	194	case BLKTRACESTART:
	195	case BLKTRACESTOP:
	196	case BLKTRACESETUP:
	197	case BLKTRACETEARDOWN:
	198	return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
bb93e3a5 AB	199	}
	200	return -ENOIOCTLCMD;
	201	}
	202
7006f6ec AK	203	int blkdev_driver_ioctl(struct inode inode, struct file file,
7006f6ec AK	204	struct gendisk *disk, unsigned cmd, unsigned long arg)
bb93e3a5 AB	205	{
	206	int ret;
	207	if (disk->fops->unlocked_ioctl)
	208	return disk->fops->unlocked_ioctl(file, cmd, arg);
	209
	210	if (disk->fops->ioctl) {
	211	lock_kernel();
	212	ret = disk->fops->ioctl(inode, file, cmd, arg);
	213	unlock_kernel();
	214	return ret;
	215	}
	216
	217	return -ENOTTY;
	218	}
7006f6ec	219	EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
bb93e3a5	220
f58c4c0a AB	221	/*
	222	* always keep this in sync with compat_blkdev_ioctl() and
	223	* compat_blkdev_locked_ioctl()
	224	*/
bb93e3a5 AB	225	int blkdev_ioctl(struct inode inode, struct file file, unsigned cmd,
	226	unsigned long arg)
	227	{
	228	struct block_device *bdev = inode->i_bdev;
	229	struct gendisk *disk = bdev->bd_disk;
	230	int ret, n;
	231
	232	switch(cmd) {
1da177e4 LT	233	case BLKFLSBUF:
	234	if (!capable(CAP_SYS_ADMIN))
	235	return -EACCES;
bb93e3a5 AB	236
	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;
	241
	242	lock_kernel();
1da177e4	243	fsync_bdev(bdev);
f98393a6	244	invalidate_bdev(bdev);
bb93e3a5	245	unlock_kernel();
1da177e4	246	return 0;
bb93e3a5	247
1da177e4	248	case BLKROSET:
bb93e3a5 AB	249	ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
	250	/* -EINVAL to handle old uncorrected drivers */
	251	if (ret != -EINVAL && ret != -ENOTTY)
	252	return ret;
1da177e4 LT	253	if (!capable(CAP_SYS_ADMIN))
	254	return -EACCES;
	255	if (get_user(n, (int __user *)(arg)))
	256	return -EFAULT;
bb93e3a5	257	lock_kernel();
1da177e4	258	set_device_ro(bdev, n);
bb93e3a5	259	unlock_kernel();
1da177e4	260	return 0;
a885c8c4 CH	261	case HDIO_GETGEO: {
	262	struct hd_geometry geo;
	263
	264	if (!arg)
	265	return -EINVAL;
	266	if (!disk->fops->getgeo)
	267	return -ENOTTY;
	268
	269	/*
	270	* We need to set the startsect first, the driver may
	271	* want to override it.
	272	*/
	273	geo.start = get_start_sect(bdev);
	274	ret = disk->fops->getgeo(bdev, &geo);
	275	if (ret)
	276	return ret;
	277	if (copy_to_user((struct hd_geometry __user *)arg, &geo,
	278	sizeof(geo)))
	279	return -EFAULT;
	280	return 0;
	281	}
1da177e4	282	}
bb93e3a5 AB	283
	284	lock_kernel();
	285	ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
	286	unlock_kernel();
	287	if (ret != -ENOIOCTLCMD)
	288	return ret;
	289
	290	return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
1da177e4	291	}
68f66feb	292	EXPORT_SYMBOL_GPL(blkdev_ioctl);