[GitHub/mt8127/android_kernel_alcatel_ttab.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);
			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)
{
	if (start & 511)
		return -EINVAL;
	if (len & 511)
		return -EINVAL;
	start >>= 9;
	len >>= 9;

	if (start + len > (bdev->bd_inode->i_size >> 9))
		return -EINVAL;
	return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
				    BLKDEV_IFL_WAIT);
}

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: {
		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]);
	}

	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;
	}
	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 = bdev->bd_inode->i_size;
		if ((size >> 9) > ~0UL)
			return -EFBIG;
		return put_ulong(arg, size >> 9);
	case BLKGETSIZE64:
		return put_u64(arg, bdev->bd_inode->i_size);
	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>
5a0e3ad6	3	#include <linux/gfp.h>
1da177e4	4	#include <linux/blkpg.h>
a885c8c4	5	#include <linux/hdreg.h>
1da177e4 LT	6	#include <linux/backing-dev.h>
	7	#include <linux/buffer_head.h>
	8	#include <linux/smp_lock.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 TH	64	part = add_partition(disk, partno, start, length,
ba32929a TH	65	ADDPART_FLAG_NONE);
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
b5d0b9df	105	if (!disk_partitionable(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 DW	116	static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
	117	uint64_t len)
	118	{
d30a2605 DW	119	if (start & 511)
	120	return -EINVAL;
	121	if (len & 511)
	122	return -EINVAL;
	123	start >>= 9;
	124	len >>= 9;
	125
	126	if (start + len > (bdev->bd_inode->i_size >> 9))
	127	return -EINVAL;
746cd1e7	128	return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
fbd9b09a	129	BLKDEV_IFL_WAIT);
d30a2605 DW	130	}
d30a2605 DW	131
1da177e4 LT	132	static int put_ushort(unsigned long arg, unsigned short val)
	133	{
	134	return put_user(val, (unsigned short __user *)arg);
	135	}
	136
	137	static int put_int(unsigned long arg, int val)
	138	{
	139	return put_user(val, (int __user *)arg);
	140	}
	141
ac481c20 MP	142	static int put_uint(unsigned long arg, unsigned int val)
	143	{
	144	return put_user(val, (unsigned int __user *)arg);
	145	}
	146
1da177e4 LT	147	static int put_long(unsigned long arg, long val)
	148	{
	149	return put_user(val, (long __user *)arg);
	150	}
	151
	152	static int put_ulong(unsigned long arg, unsigned long val)
	153	{
	154	return put_user(val, (unsigned long __user *)arg);
	155	}
	156
	157	static int put_u64(unsigned long arg, u64 val)
	158	{
	159	return put_user(val, (u64 __user *)arg);
	160	}
	161
633a08b8 AV	162	int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
	163	unsigned cmd, unsigned long arg)
	164	{
	165	struct gendisk *disk = bdev->bd_disk;
d4430d62 AV	166
	167	if (disk->fops->ioctl)
	168	return disk->fops->ioctl(bdev, mode, cmd, arg);
633a08b8	169
633a08b8 AV	170	return -ENOTTY;
	171	}
	172	/*
	173	* For the record: _GPL here is only because somebody decided to slap it
	174	* on the previous export. Sheer idiocy, since it wasn't copyrightable
	175	* at all and could be open-coded without any exports by anybody who cares.
	176	*/
	177	EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
	178
f58c4c0a	179	/*
8a6cfeb6	180	* always keep this in sync with compat_blkdev_ioctl()
f58c4c0a	181	*/
56b26add	182	int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
bb93e3a5 AB	183	unsigned long arg)
bb93e3a5 AB	184	{
bb93e3a5	185	struct gendisk *disk = bdev->bd_disk;
45048d09 AV	186	struct backing_dev_info *bdi;
45048d09 AV	187	loff_t size;
bb93e3a5 AB	188	int ret, n;
	189
	190	switch(cmd) {
1da177e4 LT	191	case BLKFLSBUF:
	192	if (!capable(CAP_SYS_ADMIN))
	193	return -EACCES;
bb93e3a5	194
e436fdae	195	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
bb93e3a5 AB	196	/* -EINVAL to handle old uncorrected drivers */
	197	if (ret != -EINVAL && ret != -ENOTTY)
	198	return ret;
	199
1da177e4	200	fsync_bdev(bdev);
f98393a6	201	invalidate_bdev(bdev);
1da177e4	202	return 0;
bb93e3a5	203
1da177e4	204	case BLKROSET:
e436fdae	205	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
bb93e3a5 AB	206	/* -EINVAL to handle old uncorrected drivers */
	207	if (ret != -EINVAL && ret != -ENOTTY)
	208	return ret;
1da177e4 LT	209	if (!capable(CAP_SYS_ADMIN))
	210	return -EACCES;
	211	if (get_user(n, (int __user *)(arg)))
	212	return -EFAULT;
	213	set_device_ro(bdev, n);
	214	return 0;
d30a2605 DW	215
	216	case BLKDISCARD: {
	217	uint64_t range[2];
	218
e436fdae	219	if (!(mode & FMODE_WRITE))
d30a2605 DW	220	return -EBADF;
	221
	222	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
	223	return -EFAULT;
	224
	225	return blk_ioctl_discard(bdev, range[0], range[1]);
	226	}
	227
a885c8c4 CH	228	case HDIO_GETGEO: {
	229	struct hd_geometry geo;
	230
	231	if (!arg)
	232	return -EINVAL;
	233	if (!disk->fops->getgeo)
	234	return -ENOTTY;
	235
	236	/*
	237	* We need to set the startsect first, the driver may
	238	* want to override it.
	239	*/
	240	geo.start = get_start_sect(bdev);
	241	ret = disk->fops->getgeo(bdev, &geo);
	242	if (ret)
	243	return ret;
	244	if (copy_to_user((struct hd_geometry __user *)arg, &geo,
	245	sizeof(geo)))
	246	return -EFAULT;
	247	return 0;
	248	}
45048d09 AV	249	case BLKRAGET:
	250	case BLKFRAGET:
	251	if (!arg)
	252	return -EINVAL;
	253	bdi = blk_get_backing_dev_info(bdev);
	254	if (bdi == NULL)
	255	return -ENOTTY;
	256	return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	257	case BLKROGET:
	258	return put_int(arg, bdev_read_only(bdev) != 0);
ac481c20	259	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
45048d09	260	return put_int(arg, block_size(bdev));
ac481c20	261	case BLKSSZGET: /* get block device logical block size */
e1defc4f	262	return put_int(arg, bdev_logical_block_size(bdev));
ac481c20 MP	263	case BLKPBSZGET: /* get block device physical block size */
	264	return put_uint(arg, bdev_physical_block_size(bdev));
	265	case BLKIOMIN:
	266	return put_uint(arg, bdev_io_min(bdev));
	267	case BLKIOOPT:
	268	return put_uint(arg, bdev_io_opt(bdev));
	269	case BLKALIGNOFF:
	270	return put_int(arg, bdev_alignment_offset(bdev));
98262f27 MP	271	case BLKDISCARDZEROES:
98262f27 MP	272	return put_uint(arg, bdev_discard_zeroes_data(bdev));
45048d09	273	case BLKSECTGET:
ae03bf63	274	return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
45048d09 AV	275	case BLKRASET:
	276	case BLKFRASET:
	277	if(!capable(CAP_SYS_ADMIN))
	278	return -EACCES;
	279	bdi = blk_get_backing_dev_info(bdev);
	280	if (bdi == NULL)
	281	return -ENOTTY;
45048d09	282	bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
45048d09 AV	283	return 0;
	284	case BLKBSZSET:
	285	/* set the logical block size */
	286	if (!capable(CAP_SYS_ADMIN))
	287	return -EACCES;
	288	if (!arg)
	289	return -EINVAL;
	290	if (get_user(n, (int __user *) arg))
	291	return -EFAULT;
6af3a56e	292	if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
45048d09 AV	293	return -EBUSY;
45048d09 AV	294	ret = set_blocksize(bdev, n);
6af3a56e AV	295	if (!(mode & FMODE_EXCL))
6af3a56e AV	296	bd_release(bdev);
bb93e3a5	297	return ret;
45048d09	298	case BLKPG:
45048d09	299	ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
45048d09 AV	300	break;
45048d09 AV	301	case BLKRRPART:
45048d09	302	ret = blkdev_reread_part(bdev);
45048d09 AV	303	break;
	304	case BLKGETSIZE:
	305	size = bdev->bd_inode->i_size;
	306	if ((size >> 9) > ~0UL)
	307	return -EFBIG;
	308	return put_ulong(arg, size >> 9);
	309	case BLKGETSIZE64:
	310	return put_u64(arg, bdev->bd_inode->i_size);
	311	case BLKTRACESTART:
	312	case BLKTRACESTOP:
	313	case BLKTRACESETUP:
	314	case BLKTRACETEARDOWN:
45048d09	315	ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
45048d09 AV	316	break;
	317	default:
	318	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
	319	}
	320	return ret;
1da177e4	321	}
68f66feb	322	EXPORT_SYMBOL_GPL(blkdev_ioctl);