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

/*
 *  linux/fs/ioctl.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/syscalls.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/capability.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/security.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h>

#include <asm/ioctls.h>

/* So that the fiemap access checks can't overflow on 32 bit machines. */
#define FIEMAP_MAX_EXTENTS	(UINT_MAX / sizeof(struct fiemap_extent))

/**
 * vfs_ioctl - call filesystem specific ioctl methods
 * @filp:	open file to invoke ioctl method on
 * @cmd:	ioctl command to execute
 * @arg:	command-specific argument for ioctl
 *
 * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
 * invokes filesystem specific ->ioctl method.  If neither method exists,
 * returns -ENOTTY.
 *
 * Returns 0 on success, -errno on error.
 */
static long vfs_ioctl(struct file *filp, unsigned int cmd,
		      unsigned long arg)
{
	int error = -ENOTTY;

	if (!filp->f_op)
		goto out;

	if (filp->f_op->unlocked_ioctl) {
		error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
		if (error == -ENOIOCTLCMD)
			error = -EINVAL;
		goto out;
	} else if (filp->f_op->ioctl) {
		lock_kernel();
		error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
					  filp, cmd, arg);
		unlock_kernel();
	}

 out:
	return error;
}

static int ioctl_fibmap(struct file *filp, int __user *p)
{
	struct address_space *mapping = filp->f_mapping;
	int res, block;

	/* do we support this mess? */
	if (!mapping->a_ops->bmap)
		return -EINVAL;
	if (!capable(CAP_SYS_RAWIO))
		return -EPERM;
	res = get_user(block, p);
	if (res)
		return res;
	lock_kernel();
	res = mapping->a_ops->bmap(mapping, block);
	unlock_kernel();
	return put_user(res, p);
}

/**
 * fiemap_fill_next_extent - Fiemap helper function
 * @fieinfo:	Fiemap context passed into ->fiemap
 * @logical:	Extent logical start offset, in bytes
 * @phys:	Extent physical start offset, in bytes
 * @len:	Extent length, in bytes
 * @flags:	FIEMAP_EXTENT flags that describe this extent
 *
 * Called from file system ->fiemap callback. Will populate extent
 * info as passed in via arguments and copy to user memory. On
 * success, extent count on fieinfo is incremented.
 *
 * Returns 0 on success, -errno on error, 1 if this was the last
 * extent that will fit in user array.
 */
#define SET_UNKNOWN_FLAGS	(FIEMAP_EXTENT_DELALLOC)
#define SET_NO_UNMOUNTED_IO_FLAGS	(FIEMAP_EXTENT_DATA_ENCRYPTED)
#define SET_NOT_ALIGNED_FLAGS	(FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
			    u64 phys, u64 len, u32 flags)
{
	struct fiemap_extent extent;
	struct fiemap_extent *dest = fieinfo->fi_extents_start;

	/* only count the extents */
	if (fieinfo->fi_extents_max == 0) {
		fieinfo->fi_extents_mapped++;
		return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
	}

	if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
		return 1;

	if (flags & SET_UNKNOWN_FLAGS)
		flags |= FIEMAP_EXTENT_UNKNOWN;
	if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
		flags |= FIEMAP_EXTENT_ENCODED;
	if (flags & SET_NOT_ALIGNED_FLAGS)
		flags |= FIEMAP_EXTENT_NOT_ALIGNED;

	memset(&extent, 0, sizeof(extent));
	extent.fe_logical = logical;
	extent.fe_physical = phys;
	extent.fe_length = len;
	extent.fe_flags = flags;

	dest += fieinfo->fi_extents_mapped;
	if (copy_to_user(dest, &extent, sizeof(extent)))
		return -EFAULT;

	fieinfo->fi_extents_mapped++;
	if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
		return 1;
	return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
}
EXPORT_SYMBOL(fiemap_fill_next_extent);

/**
 * fiemap_check_flags - check validity of requested flags for fiemap
 * @fieinfo:	Fiemap context passed into ->fiemap
 * @fs_flags:	Set of fiemap flags that the file system understands
 *
 * Called from file system ->fiemap callback. This will compute the
 * intersection of valid fiemap flags and those that the fs supports. That
 * value is then compared against the user supplied flags. In case of bad user
 * flags, the invalid values will be written into the fieinfo structure, and
 * -EBADR is returned, which tells ioctl_fiemap() to return those values to
 * userspace. For this reason, a return code of -EBADR should be preserved.
 *
 * Returns 0 on success, -EBADR on bad flags.
 */
int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
{
	u32 incompat_flags;

	incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
	if (incompat_flags) {
		fieinfo->fi_flags = incompat_flags;
		return -EBADR;
	}
	return 0;
}
EXPORT_SYMBOL(fiemap_check_flags);

static int fiemap_check_ranges(struct super_block *sb,
			       u64 start, u64 len, u64 *new_len)
{
	*new_len = len;

	if (len == 0)
		return -EINVAL;

	if (start > sb->s_maxbytes)
		return -EFBIG;

	/*
	 * Shrink request scope to what the fs can actually handle.
	 */
	if ((len > sb->s_maxbytes) ||
	    (sb->s_maxbytes - len) < start)
		*new_len = sb->s_maxbytes - start;

	return 0;
}

static int ioctl_fiemap(struct file *filp, unsigned long arg)
{
	struct fiemap fiemap;
	struct fiemap_extent_info fieinfo = { 0, };
	struct inode *inode = filp->f_path.dentry->d_inode;
	struct super_block *sb = inode->i_sb;
	u64 len;
	int error;

	if (!inode->i_op->fiemap)
		return -EOPNOTSUPP;

	if (copy_from_user(&fiemap, (struct fiemap __user *)arg,
			   sizeof(struct fiemap)))
		return -EFAULT;

	if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
		return -EINVAL;

	error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
				    &len);
	if (error)
		return error;

	fieinfo.fi_flags = fiemap.fm_flags;
	fieinfo.fi_extents_max = fiemap.fm_extent_count;
	fieinfo.fi_extents_start = (struct fiemap_extent *)(arg + sizeof(fiemap));

	if (fiemap.fm_extent_count != 0 &&
	    !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
		       fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
		return -EFAULT;

	if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
		filemap_write_and_wait(inode->i_mapping);

	error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
	fiemap.fm_flags = fieinfo.fi_flags;
	fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
	if (copy_to_user((char *)arg, &fiemap, sizeof(fiemap)))
		error = -EFAULT;

	return error;
}

#ifdef CONFIG_BLOCK

#define blk_to_logical(inode, blk) (blk << (inode)->i_blkbits)
#define logical_to_blk(inode, offset) (offset >> (inode)->i_blkbits);

/*
 * @inode - the inode to map
 * @arg - the pointer to userspace where we copy everything to
 * @get_block - the fs's get_block function
 *
 * This does FIEMAP for block based inodes.  Basically it will just loop
 * through get_block until we hit the number of extents we want to map, or we
 * go past the end of the file and hit a hole.
 *
 * If it is possible to have data blocks beyond a hole past @inode->i_size, then
 * please do not use this function, it will stop at the first unmapped block
 * beyond i_size
 */
int generic_block_fiemap(struct inode *inode,
			 struct fiemap_extent_info *fieinfo, u64 start,
			 u64 len, get_block_t *get_block)
{
	struct buffer_head tmp;
	unsigned int start_blk;
	long long length = 0, map_len = 0;
	u64 logical = 0, phys = 0, size = 0;
	u32 flags = FIEMAP_EXTENT_MERGED;
	int ret = 0;

	if ((ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC)))
		return ret;

	start_blk = logical_to_blk(inode, start);

	/* guard against change */
	mutex_lock(&inode->i_mutex);

	length = (long long)min_t(u64, len, i_size_read(inode));
	map_len = length;

	do {
		/*
		 * we set b_size to the total size we want so it will map as
		 * many contiguous blocks as possible at once
		 */
		memset(&tmp, 0, sizeof(struct buffer_head));
		tmp.b_size = map_len;

		ret = get_block(inode, start_blk, &tmp, 0);
		if (ret)
			break;

		/* HOLE */
		if (!buffer_mapped(&tmp)) {
			/*
			 * first hole after going past the EOF, this is our
			 * last extent
			 */
			if (length <= 0) {
				flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
				ret = fiemap_fill_next_extent(fieinfo, logical,
							      phys, size,
							      flags);
				break;
			}

			length -= blk_to_logical(inode, 1);

			/* if we have holes up to/past EOF then we're done */
			if (length <= 0)
				break;

			start_blk++;
		} else {
			if (length <= 0 && size) {
				ret = fiemap_fill_next_extent(fieinfo, logical,
							      phys, size,
							      flags);
				if (ret)
					break;
			}

			logical = blk_to_logical(inode, start_blk);
			phys = blk_to_logical(inode, tmp.b_blocknr);
			size = tmp.b_size;
			flags = FIEMAP_EXTENT_MERGED;

			length -= tmp.b_size;
			start_blk += logical_to_blk(inode, size);

			/*
			 * if we are past the EOF we need to loop again to see
			 * if there is a hole so we can mark this extent as the
			 * last one, and if not keep mapping things until we
			 * find a hole, or we run out of slots in the extent
			 * array
			 */
			if (length <= 0)
				continue;

			ret = fiemap_fill_next_extent(fieinfo, logical, phys,
						      size, flags);
			if (ret)
				break;
		}
		cond_resched();
	} while (1);

	mutex_unlock(&inode->i_mutex);

	/* if ret is 1 then we just hit the end of the extent array */
	if (ret == 1)
		ret = 0;

	return ret;
}
EXPORT_SYMBOL(generic_block_fiemap);

#endif  /*  CONFIG_BLOCK  */

static int file_ioctl(struct file *filp, unsigned int cmd,
		unsigned long arg)
{
	struct inode *inode = filp->f_path.dentry->d_inode;
	int __user *p = (int __user *)arg;

	switch (cmd) {
	case FIBMAP:
		return ioctl_fibmap(filp, p);
	case FS_IOC_FIEMAP:
		return ioctl_fiemap(filp, arg);
	case FIGETBSZ:
		return put_user(inode->i_sb->s_blocksize, p);
	case FIONREAD:
		return put_user(i_size_read(inode) - filp->f_pos, p);
	}

	return vfs_ioctl(filp, cmd, arg);
}

static int ioctl_fionbio(struct file *filp, int __user *argp)
{
	unsigned int flag;
	int on, error;

	error = get_user(on, argp);
	if (error)
		return error;
	flag = O_NONBLOCK;
#ifdef __sparc__
	/* SunOS compatibility item. */
	if (O_NONBLOCK != O_NDELAY)
		flag |= O_NDELAY;
#endif
	if (on)
		filp->f_flags |= flag;
	else
		filp->f_flags &= ~flag;
	return error;
}

static int ioctl_fioasync(unsigned int fd, struct file *filp,
			  int __user *argp)
{
	unsigned int flag;
	int on, error;

	error = get_user(on, argp);
	if (error)
		return error;
	flag = on ? FASYNC : 0;

	/* Did FASYNC state change ? */
	if ((flag ^ filp->f_flags) & FASYNC) {
		if (filp->f_op && filp->f_op->fasync) {
			lock_kernel();
			error = filp->f_op->fasync(fd, filp, on);
			unlock_kernel();
		} else
			error = -ENOTTY;
	}
	if (error)
		return error;

	if (on)
		filp->f_flags |= FASYNC;
	else
		filp->f_flags &= ~FASYNC;
	return error;
}

/*
 * When you add any new common ioctls to the switches above and below
 * please update compat_sys_ioctl() too.
 *
 * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
 */
int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
	     unsigned long arg)
{
	int error = 0;
	int __user *argp = (int __user *)arg;

	switch (cmd) {
	case FIOCLEX:
		set_close_on_exec(fd, 1);
		break;

	case FIONCLEX:
		set_close_on_exec(fd, 0);
		break;

	case FIONBIO:
		error = ioctl_fionbio(filp, argp);
		break;

	case FIOASYNC:
		error = ioctl_fioasync(fd, filp, argp);
		break;

	case FIOQSIZE:
		if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
		    S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
		    S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
			loff_t res =
				inode_get_bytes(filp->f_path.dentry->d_inode);
			error = copy_to_user((loff_t __user *)arg, &res,
					     sizeof(res)) ? -EFAULT : 0;
		} else
			error = -ENOTTY;
		break;
	default:
		if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
			error = file_ioctl(filp, cmd, arg);
		else
			error = vfs_ioctl(filp, cmd, arg);
		break;
	}
	return error;
}

asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
{
	struct file *filp;
	int error = -EBADF;
	int fput_needed;

	filp = fget_light(fd, &fput_needed);
	if (!filp)
		goto out;

	error = security_file_ioctl(filp, cmd, arg);
	if (error)
		goto out_fput;

	error = do_vfs_ioctl(filp, fd, cmd, arg);
 out_fput:
	fput_light(filp, fput_needed);
 out:
	return error;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ioctl.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
1da177e4 LT	7	#include <linux/syscalls.h>
	8	#include <linux/mm.h>
	9	#include <linux/smp_lock.h>
16f7e0fe	10	#include <linux/capability.h>
1da177e4 LT	11	#include <linux/file.h>
	12	#include <linux/fs.h>
	13	#include <linux/security.h>
	14	#include <linux/module.h>
c9845ff1	15	#include <linux/uaccess.h>
68c9d702 JB	16	#include <linux/writeback.h>
68c9d702 JB	17	#include <linux/buffer_head.h>
1da177e4	18
1da177e4 LT	19	#include <asm/ioctls.h>
1da177e4 LT	20
c4b929b8 MF	21	/* So that the fiemap access checks can't overflow on 32 bit machines. */
	22	#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
	23
deb21db7 EZ	24	/**
deb21db7 EZ	25	* vfs_ioctl - call filesystem specific ioctl methods
f6a4c8bd CH	26	* @filp: open file to invoke ioctl method on
	27	* @cmd: ioctl command to execute
	28	* @arg: command-specific argument for ioctl
deb21db7 EZ	29	*
deb21db7 EZ	30	* Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
f6a4c8bd	31	* invokes filesystem specific ->ioctl method. If neither method exists,
deb21db7 EZ	32	* returns -ENOTTY.
	33	*
	34	* Returns 0 on success, -errno on error.
	35	*/
67cde595 AB	36	static long vfs_ioctl(struct file *filp, unsigned int cmd,
67cde595 AB	37	unsigned long arg)
1da177e4 LT	38	{
	39	int error = -ENOTTY;
	40
	41	if (!filp->f_op)
	42	goto out;
	43
	44	if (filp->f_op->unlocked_ioctl) {
	45	error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
	46	if (error == -ENOIOCTLCMD)
	47	error = -EINVAL;
	48	goto out;
64d67d21	49	} else if (filp->f_op->ioctl) {
1da177e4	50	lock_kernel();
64d67d21 AM	51	error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
64d67d21 AM	52	filp, cmd, arg);
1da177e4 LT	53	unlock_kernel();
	54	}
	55
	56	out:
	57	return error;
	58	}
	59
aa81a7c7 EZ	60	static int ioctl_fibmap(struct file filp, int __user p)
	61	{
	62	struct address_space *mapping = filp->f_mapping;
	63	int res, block;
	64
	65	/* do we support this mess? */
	66	if (!mapping->a_ops->bmap)
	67	return -EINVAL;
	68	if (!capable(CAP_SYS_RAWIO))
	69	return -EPERM;
	70	res = get_user(block, p);
	71	if (res)
	72	return res;
	73	lock_kernel();
	74	res = mapping->a_ops->bmap(mapping, block);
	75	unlock_kernel();
	76	return put_user(res, p);
	77	}
	78
c4b929b8 MF	79	/**
	80	* fiemap_fill_next_extent - Fiemap helper function
	81	* @fieinfo: Fiemap context passed into ->fiemap
	82	* @logical: Extent logical start offset, in bytes
	83	* @phys: Extent physical start offset, in bytes
	84	* @len: Extent length, in bytes
	85	* @flags: FIEMAP_EXTENT flags that describe this extent
	86	*
	87	* Called from file system ->fiemap callback. Will populate extent
	88	* info as passed in via arguments and copy to user memory. On
	89	* success, extent count on fieinfo is incremented.
	90	*
	91	* Returns 0 on success, -errno on error, 1 if this was the last
	92	* extent that will fit in user array.
	93	*/
	94	#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
	95	#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED)
	96	#define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL\|FIEMAP_EXTENT_DATA_INLINE)
	97	int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
	98	u64 phys, u64 len, u32 flags)
	99	{
	100	struct fiemap_extent extent;
	101	struct fiemap_extent *dest = fieinfo->fi_extents_start;
	102
	103	/* only count the extents */
	104	if (fieinfo->fi_extents_max == 0) {
	105	fieinfo->fi_extents_mapped++;
	106	return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
	107	}
	108
	109	if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
	110	return 1;
	111
	112	if (flags & SET_UNKNOWN_FLAGS)
	113	flags \|= FIEMAP_EXTENT_UNKNOWN;
	114	if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
	115	flags \|= FIEMAP_EXTENT_ENCODED;
	116	if (flags & SET_NOT_ALIGNED_FLAGS)
	117	flags \|= FIEMAP_EXTENT_NOT_ALIGNED;
	118
	119	memset(&extent, 0, sizeof(extent));
	120	extent.fe_logical = logical;
	121	extent.fe_physical = phys;
	122	extent.fe_length = len;
	123	extent.fe_flags = flags;
	124
	125	dest += fieinfo->fi_extents_mapped;
	126	if (copy_to_user(dest, &extent, sizeof(extent)))
	127	return -EFAULT;
	128
	129	fieinfo->fi_extents_mapped++;
	130	if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
	131	return 1;
	132	return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
	133	}
	134	EXPORT_SYMBOL(fiemap_fill_next_extent);
	135
	136	/**
	137	* fiemap_check_flags - check validity of requested flags for fiemap
	138	* @fieinfo: Fiemap context passed into ->fiemap
	139	* @fs_flags: Set of fiemap flags that the file system understands
	140	*
	141	* Called from file system ->fiemap callback. This will compute the
	142	* intersection of valid fiemap flags and those that the fs supports. That
143	* value is then compared against the user supplied flags. In case of bad user
144	* flags, the invalid values will be written into the fieinfo structure, and
145	* -EBADR is returned, which tells ioctl_fiemap() to return those values to
146	* userspace. For this reason, a return code of -EBADR should be preserved.
147	*
148	* Returns 0 on success, -EBADR on bad flags.
149	*/
150	int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
151	{
152	u32 incompat_flags;
153
154	incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
155	if (incompat_flags) {
156	fieinfo->fi_flags = incompat_flags;
157	return -EBADR;
158	}
159	return 0;
160	}
161	EXPORT_SYMBOL(fiemap_check_flags);
162
163	static int fiemap_check_ranges(struct super_block *sb,
164	u64 start, u64 len, u64 *new_len)
165	{
166	*new_len = len;
167
168	if (len == 0)
169	return -EINVAL;
170
171	if (start > sb->s_maxbytes)
172	return -EFBIG;
173
174	/*
175	* Shrink request scope to what the fs can actually handle.
176	*/
177	if ((len > sb->s_maxbytes) \|\|
178	(sb->s_maxbytes - len) < start)
179	*new_len = sb->s_maxbytes - start;
180
181	return 0;
182	}
183
184	static int ioctl_fiemap(struct file *filp, unsigned long arg)
185	{
186	struct fiemap fiemap;
187	struct fiemap_extent_info fieinfo = { 0, };
188	struct inode *inode = filp->f_path.dentry->d_inode;
189	struct super_block *sb = inode->i_sb;
190	u64 len;
191	int error;
192
193	if (!inode->i_op->fiemap)
194	return -EOPNOTSUPP;
195
196	if (copy_from_user(&fiemap, (struct fiemap __user *)arg,
197	sizeof(struct fiemap)))
198	return -EFAULT;
199
200	if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
201	return -EINVAL;
202
203	error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
204	&len);
205	if (error)
206	return error;
207
208	fieinfo.fi_flags = fiemap.fm_flags;
209	fieinfo.fi_extents_max = fiemap.fm_extent_count;
210	fieinfo.fi_extents_start = (struct fiemap_extent *)(arg + sizeof(fiemap));
211
212	if (fiemap.fm_extent_count != 0 &&
213	!access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
214	fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
215	return -EFAULT;
216
217	if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
218	filemap_write_and_wait(inode->i_mapping);
219
220	error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
221	fiemap.fm_flags = fieinfo.fi_flags;
222	fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
223	if (copy_to_user((char *)arg, &fiemap, sizeof(fiemap)))
224	error = -EFAULT;
225
226	return error;
227	}
228
06270d5d AB	229	#ifdef CONFIG_BLOCK
06270d5d AB	230
68c9d702 JB	231	#define blk_to_logical(inode, blk) (blk << (inode)->i_blkbits)
	232	#define logical_to_blk(inode, offset) (offset >> (inode)->i_blkbits);
	233
	234	/*
	235	* @inode - the inode to map
	236	* @arg - the pointer to userspace where we copy everything to
	237	* @get_block - the fs's get_block function
	238	*
	239	* This does FIEMAP for block based inodes. Basically it will just loop
	240	* through get_block until we hit the number of extents we want to map, or we
	241	* go past the end of the file and hit a hole.
	242	*
	243	* If it is possible to have data blocks beyond a hole past @inode->i_size, then
	244	* please do not use this function, it will stop at the first unmapped block
	245	* beyond i_size
	246	*/
	247	int generic_block_fiemap(struct inode *inode,
	248	struct fiemap_extent_info *fieinfo, u64 start,
	249	u64 len, get_block_t *get_block)
	250	{
	251	struct buffer_head tmp;
	252	unsigned int start_blk;
	253	long long length = 0, map_len = 0;
	254	u64 logical = 0, phys = 0, size = 0;
	255	u32 flags = FIEMAP_EXTENT_MERGED;
	256	int ret = 0;
	257
	258	if ((ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC)))
	259	return ret;
	260
	261	start_blk = logical_to_blk(inode, start);
	262
	263	/* guard against change */
	264	mutex_lock(&inode->i_mutex);
	265
	266	length = (long long)min_t(u64, len, i_size_read(inode));
	267	map_len = length;
	268
	269	do {
	270	/*
	271	* we set b_size to the total size we want so it will map as
	272	* many contiguous blocks as possible at once
	273	*/
	274	memset(&tmp, 0, sizeof(struct buffer_head));
	275	tmp.b_size = map_len;
	276
	277	ret = get_block(inode, start_blk, &tmp, 0);
	278	if (ret)
	279	break;
	280
	281	/* HOLE */
	282	if (!buffer_mapped(&tmp)) {
	283	/*
	284	* first hole after going past the EOF, this is our
	285	* last extent
	286	*/
	287	if (length <= 0) {
	288	flags = FIEMAP_EXTENT_MERGED\|FIEMAP_EXTENT_LAST;
	289	ret = fiemap_fill_next_extent(fieinfo, logical,
	290	phys, size,
	291	flags);
	292	break;
	293	}
	294
295	length -= blk_to_logical(inode, 1);
296
297	/* if we have holes up to/past EOF then we're done */
298	if (length <= 0)
299	break;
300
301	start_blk++;
302	} else {
303	if (length <= 0 && size) {
304	ret = fiemap_fill_next_extent(fieinfo, logical,
305	phys, size,
306	flags);
307	if (ret)
308	break;
309	}
310
311	logical = blk_to_logical(inode, start_blk);
312	phys = blk_to_logical(inode, tmp.b_blocknr);
313	size = tmp.b_size;
314	flags = FIEMAP_EXTENT_MERGED;
315
316	length -= tmp.b_size;
317	start_blk += logical_to_blk(inode, size);
318
319	/*
320	* if we are past the EOF we need to loop again to see
321	* if there is a hole so we can mark this extent as the
322	* last one, and if not keep mapping things until we
323	* find a hole, or we run out of slots in the extent
324	* array
325	*/
326	if (length <= 0)
327	continue;
328
329	ret = fiemap_fill_next_extent(fieinfo, logical, phys,
330	size, flags);
331	if (ret)
332	break;
333	}
334	cond_resched();
335	} while (1);
336
337	mutex_unlock(&inode->i_mutex);
338
339	/* if ret is 1 then we just hit the end of the extent array */
340	if (ret == 1)
341	ret = 0;
342
343	return ret;
344	}
345	EXPORT_SYMBOL(generic_block_fiemap);
346
06270d5d AB	347	#endif /* CONFIG_BLOCK */
06270d5d AB	348
1da177e4 LT	349	static int file_ioctl(struct file *filp, unsigned int cmd,
	350	unsigned long arg)
	351	{
c9845ff1	352	struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4 LT	353	int __user p = (int __user )arg;
	354
	355	switch (cmd) {
c9845ff1	356	case FIBMAP:
aa81a7c7	357	return ioctl_fibmap(filp, p);
c4b929b8 MF	358	case FS_IOC_FIEMAP:
c4b929b8 MF	359	return ioctl_fiemap(filp, arg);
c9845ff1 EZ	360	case FIGETBSZ:
	361	return put_user(inode->i_sb->s_blocksize, p);
	362	case FIONREAD:
	363	return put_user(i_size_read(inode) - filp->f_pos, p);
1da177e4 LT	364	}
1da177e4 LT	365
deb21db7	366	return vfs_ioctl(filp, cmd, arg);
1da177e4 LT	367	}
1da177e4 LT	368
aa81a7c7 EZ	369	static int ioctl_fionbio(struct file filp, int __user argp)
	370	{
	371	unsigned int flag;
	372	int on, error;
	373
	374	error = get_user(on, argp);
	375	if (error)
	376	return error;
	377	flag = O_NONBLOCK;
	378	#ifdef __sparc__
	379	/* SunOS compatibility item. */
	380	if (O_NONBLOCK != O_NDELAY)
	381	flag \|= O_NDELAY;
	382	#endif
	383	if (on)
	384	filp->f_flags \|= flag;
	385	else
	386	filp->f_flags &= ~flag;
	387	return error;
	388	}
	389
	390	static int ioctl_fioasync(unsigned int fd, struct file *filp,
	391	int __user *argp)
	392	{
	393	unsigned int flag;
	394	int on, error;
	395
	396	error = get_user(on, argp);
	397	if (error)
	398	return error;
	399	flag = on ? FASYNC : 0;
	400
	401	/* Did FASYNC state change ? */
	402	if ((flag ^ filp->f_flags) & FASYNC) {
	403	if (filp->f_op && filp->f_op->fasync) {
	404	lock_kernel();
	405	error = filp->f_op->fasync(fd, filp, on);
	406	unlock_kernel();
	407	} else
	408	error = -ENOTTY;
	409	}
	410	if (error)
	411	return error;
	412
	413	if (on)
	414	filp->f_flags \|= FASYNC;
	415	else
	416	filp->f_flags &= ~FASYNC;
	417	return error;
	418	}
	419
1da177e4 LT	420	/*
	421	* When you add any new common ioctls to the switches above and below
	422	* please update compat_sys_ioctl() too.
	423	*
deb21db7	424	* do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
1da177e4 LT	425	* It's just a simple helper for sys_ioctl and compat_sys_ioctl.
1da177e4 LT	426	*/
deb21db7 EZ	427	int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
deb21db7 EZ	428	unsigned long arg)
1da177e4	429	{
aa81a7c7 EZ	430	int error = 0;
aa81a7c7 EZ	431	int __user argp = (int __user )arg;
1da177e4 LT	432
1da177e4 LT	433	switch (cmd) {
c9845ff1 EZ	434	case FIOCLEX:
	435	set_close_on_exec(fd, 1);
	436	break;
1da177e4	437
c9845ff1 EZ	438	case FIONCLEX:
	439	set_close_on_exec(fd, 0);
	440	break;
1da177e4	441
c9845ff1	442	case FIONBIO:
aa81a7c7	443	error = ioctl_fionbio(filp, argp);
c9845ff1 EZ	444	break;
	445
	446	case FIOASYNC:
aa81a7c7	447	error = ioctl_fioasync(fd, filp, argp);
c9845ff1 EZ	448	break;
	449
	450	case FIOQSIZE:
	451	if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) \|\|
	452	S_ISREG(filp->f_path.dentry->d_inode->i_mode) \|\|
	453	S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
	454	loff_t res =
	455	inode_get_bytes(filp->f_path.dentry->d_inode);
	456	error = copy_to_user((loff_t __user *)arg, &res,
	457	sizeof(res)) ? -EFAULT : 0;
	458	} else
	459	error = -ENOTTY;
	460	break;
	461	default:
	462	if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
	463	error = file_ioctl(filp, cmd, arg);
	464	else
deb21db7	465	error = vfs_ioctl(filp, cmd, arg);
c9845ff1	466	break;
1da177e4 LT	467	}
	468	return error;
	469	}
	470
	471	asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
	472	{
c9845ff1	473	struct file *filp;
1da177e4 LT	474	int error = -EBADF;
	475	int fput_needed;
	476
	477	filp = fget_light(fd, &fput_needed);
	478	if (!filp)
	479	goto out;
	480
	481	error = security_file_ioctl(filp, cmd, arg);
	482	if (error)
	483	goto out_fput;
	484
deb21db7	485	error = do_vfs_ioctl(filp, fd, cmd, arg);
1da177e4 LT	486	out_fput:
	487	fput_light(filp, fput_needed);
	488	out:
	489	return error;
	490	}