[linux-block.git] / include / linux / uio.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *	Berkeley style UIO structures	-	Alan Cox 1994.
 */
#ifndef __LINUX_UIO_H
#define __LINUX_UIO_H

#include <linux/kernel.h>
#include <linux/thread_info.h>
#include <uapi/linux/uio.h>

struct page;
struct pipe_inode_info;

struct kvec {
	void *iov_base; /* and that should *never* hold a userland pointer */
	size_t iov_len;
};

enum iter_type {
	/* iter types */
	ITER_IOVEC,
	ITER_KVEC,
	ITER_BVEC,
	ITER_PIPE,
	ITER_XARRAY,
	ITER_DISCARD,
};

struct iov_iter_state {
	size_t iov_offset;
	size_t count;
	unsigned long nr_segs;
};

struct iov_iter {
	u8 iter_type;
	bool data_source;
	size_t iov_offset;
	size_t count;
	union {
		const struct iovec *iov;
		const struct kvec *kvec;
		const struct bio_vec *bvec;
		struct xarray *xarray;
		struct pipe_inode_info *pipe;
	};
	union {
		unsigned long nr_segs;
		struct {
			unsigned int head;
			unsigned int start_head;
		};
		loff_t xarray_start;
	};
};

static inline enum iter_type iov_iter_type(const struct iov_iter *i)
{
	return i->iter_type;
}

static inline void iov_iter_save_state(struct iov_iter *iter,
				       struct iov_iter_state *state)
{
	state->iov_offset = iter->iov_offset;
	state->count = iter->count;
	state->nr_segs = iter->nr_segs;
}

static inline bool iter_is_iovec(const struct iov_iter *i)
{
	return iov_iter_type(i) == ITER_IOVEC;
}

static inline bool iov_iter_is_kvec(const struct iov_iter *i)
{
	return iov_iter_type(i) == ITER_KVEC;
}

static inline bool iov_iter_is_bvec(const struct iov_iter *i)
{
	return iov_iter_type(i) == ITER_BVEC;
}

static inline bool iov_iter_is_pipe(const struct iov_iter *i)
{
	return iov_iter_type(i) == ITER_PIPE;
}

static inline bool iov_iter_is_discard(const struct iov_iter *i)
{
	return iov_iter_type(i) == ITER_DISCARD;
}

static inline bool iov_iter_is_xarray(const struct iov_iter *i)
{
	return iov_iter_type(i) == ITER_XARRAY;
}

static inline unsigned char iov_iter_rw(const struct iov_iter *i)
{
	return i->data_source ? WRITE : READ;
}

/*
 * Total number of bytes covered by an iovec.
 *
 * NOTE that it is not safe to use this function until all the iovec's
 * segment lengths have been validated.  Because the individual lengths can
 * overflow a size_t when added together.
 */
static inline size_t iov_length(const struct iovec *iov, unsigned long nr_segs)
{
	unsigned long seg;
	size_t ret = 0;

	for (seg = 0; seg < nr_segs; seg++)
		ret += iov[seg].iov_len;
	return ret;
}

static inline struct iovec iov_iter_iovec(const struct iov_iter *iter)
{
	return (struct iovec) {
		.iov_base = iter->iov->iov_base + iter->iov_offset,
		.iov_len = min(iter->count,
			       iter->iov->iov_len - iter->iov_offset),
	};
}

size_t copy_page_from_iter_atomic(struct page *page, unsigned offset,
				  size_t bytes, struct iov_iter *i);
void iov_iter_advance(struct iov_iter *i, size_t bytes);
void iov_iter_revert(struct iov_iter *i, size_t bytes);
size_t fault_in_iov_iter_readable(const struct iov_iter *i, size_t bytes);
size_t fault_in_iov_iter_writeable(const struct iov_iter *i, size_t bytes);
size_t iov_iter_single_seg_count(const struct iov_iter *i);
size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
			 struct iov_iter *i);
size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes,
			 struct iov_iter *i);

size_t _copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i);
size_t _copy_from_iter(void *addr, size_t bytes, struct iov_iter *i);
size_t _copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i);

static __always_inline __must_check
size_t copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
{
	if (unlikely(!check_copy_size(addr, bytes, true)))
		return 0;
	else
		return _copy_to_iter(addr, bytes, i);
}

static __always_inline __must_check
size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
{
	if (unlikely(!check_copy_size(addr, bytes, false)))
		return 0;
	else
		return _copy_from_iter(addr, bytes, i);
}

static __always_inline __must_check
bool copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i)
{
	size_t copied = copy_from_iter(addr, bytes, i);
	if (likely(copied == bytes))
		return true;
	iov_iter_revert(i, copied);
	return false;
}

static __always_inline __must_check
size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
{
	if (unlikely(!check_copy_size(addr, bytes, false)))
		return 0;
	else
		return _copy_from_iter_nocache(addr, bytes, i);
}

static __always_inline __must_check
bool copy_from_iter_full_nocache(void *addr, size_t bytes, struct iov_iter *i)
{
	size_t copied = copy_from_iter_nocache(addr, bytes, i);
	if (likely(copied == bytes))
		return true;
	iov_iter_revert(i, copied);
	return false;
}

#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
/*
 * Note, users like pmem that depend on the stricter semantics of
 * copy_from_iter_flushcache() than copy_from_iter_nocache() must check for
 * IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) before assuming that the
 * destination is flushed from the cache on return.
 */
size_t _copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i);
#else
#define _copy_from_iter_flushcache _copy_from_iter_nocache
#endif

#ifdef CONFIG_ARCH_HAS_COPY_MC
size_t _copy_mc_to_iter(const void *addr, size_t bytes, struct iov_iter *i);
#else
#define _copy_mc_to_iter _copy_to_iter
#endif

static __always_inline __must_check
size_t copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i)
{
	if (unlikely(!check_copy_size(addr, bytes, false)))
		return 0;
	else
		return _copy_from_iter_flushcache(addr, bytes, i);
}

static __always_inline __must_check
size_t copy_mc_to_iter(void *addr, size_t bytes, struct iov_iter *i)
{
	if (unlikely(!check_copy_size(addr, bytes, true)))
		return 0;
	else
		return _copy_mc_to_iter(addr, bytes, i);
}

size_t iov_iter_zero(size_t bytes, struct iov_iter *);
unsigned long iov_iter_alignment(const struct iov_iter *i);
unsigned long iov_iter_gap_alignment(const struct iov_iter *i);
void iov_iter_init(struct iov_iter *i, unsigned int direction, const struct iovec *iov,
			unsigned long nr_segs, size_t count);
void iov_iter_kvec(struct iov_iter *i, unsigned int direction, const struct kvec *kvec,
			unsigned long nr_segs, size_t count);
void iov_iter_bvec(struct iov_iter *i, unsigned int direction, const struct bio_vec *bvec,
			unsigned long nr_segs, size_t count);
void iov_iter_pipe(struct iov_iter *i, unsigned int direction, struct pipe_inode_info *pipe,
			size_t count);
void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count);
void iov_iter_xarray(struct iov_iter *i, unsigned int direction, struct xarray *xarray,
		     loff_t start, size_t count);
ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages,
			size_t maxsize, unsigned maxpages, size_t *start);
ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, struct page ***pages,
			size_t maxsize, size_t *start);
int iov_iter_npages(const struct iov_iter *i, int maxpages);
void iov_iter_restore(struct iov_iter *i, struct iov_iter_state *state);

const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags);

static inline size_t iov_iter_count(const struct iov_iter *i)
{
	return i->count;
}

/*
 * Cap the iov_iter by given limit; note that the second argument is
 * *not* the new size - it's upper limit for such.  Passing it a value
 * greater than the amount of data in iov_iter is fine - it'll just do
 * nothing in that case.
 */
static inline void iov_iter_truncate(struct iov_iter *i, u64 count)
{
	/*
	 * count doesn't have to fit in size_t - comparison extends both
	 * operands to u64 here and any value that would be truncated by
	 * conversion in assignement is by definition greater than all
	 * values of size_t, including old i->count.
	 */
	if (i->count > count)
		i->count = count;
}

/*
 * reexpand a previously truncated iterator; count must be no more than how much
 * we had shrunk it.
 */
static inline void iov_iter_reexpand(struct iov_iter *i, size_t count)
{
	i->count = count;
}

struct csum_state {
	__wsum csum;
	size_t off;
};

size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csstate, struct iov_iter *i);
size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i);

static __always_inline __must_check
bool csum_and_copy_from_iter_full(void *addr, size_t bytes,
				  __wsum *csum, struct iov_iter *i)
{
	size_t copied = csum_and_copy_from_iter(addr, bytes, csum, i);
	if (likely(copied == bytes))
		return true;
	iov_iter_revert(i, copied);
	return false;
}
size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
		struct iov_iter *i);

struct iovec *iovec_from_user(const struct iovec __user *uvector,
		unsigned long nr_segs, unsigned long fast_segs,
		struct iovec *fast_iov, bool compat);
ssize_t import_iovec(int type, const struct iovec __user *uvec,
		 unsigned nr_segs, unsigned fast_segs, struct iovec **iovp,
		 struct iov_iter *i);
ssize_t __import_iovec(int type, const struct iovec __user *uvec,
		 unsigned nr_segs, unsigned fast_segs, struct iovec **iovp,
		 struct iov_iter *i, bool compat);
int import_single_range(int type, void __user *buf, size_t len,
		 struct iovec *iov, struct iov_iter *i);

#endif
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4 LT	2	/*
1da177e4 LT	3	* Berkeley style UIO structures - Alan Cox 1994.
1da177e4	4	*/
607ca46e DH	5	#ifndef __LINUX_UIO_H
607ca46e DH	6	#define __LINUX_UIO_H
1da177e4	7
92236878	8	#include <linux/kernel.h>
aa28de27	9	#include <linux/thread_info.h>
607ca46e	10	#include <uapi/linux/uio.h>
1da177e4	11
92236878	12	struct page;
241699cd	13	struct pipe_inode_info;
812ed032 JS	14
	15	struct kvec {
	16	void iov_base; / and that should never hold a userland pointer */
	17	size_t iov_len;
	18	};
	19
00e23707	20	enum iter_type {
875f1d07	21	/* iter types */
8cd54c1c AV	22	ITER_IOVEC,
	23	ITER_KVEC,
	24	ITER_BVEC,
	25	ITER_PIPE,
	26	ITER_XARRAY,
	27	ITER_DISCARD,
62a8067a AV	28	};
62a8067a AV	29
8fb0f47a JA	30	struct iov_iter_state {
	31	size_t iov_offset;
	32	size_t count;
	33	unsigned long nr_segs;
	34	};
	35
92236878	36	struct iov_iter {
8cd54c1c AV	37	u8 iter_type;
8cd54c1c AV	38	bool data_source;
92236878 KO	39	size_t iov_offset;
92236878 KO	40	size_t count;
62a8067a AV	41	union {
62a8067a AV	42	const struct iovec *iov;
a280455f	43	const struct kvec *kvec;
62a8067a	44	const struct bio_vec *bvec;
7ff50620	45	struct xarray *xarray;
241699cd AV	46	struct pipe_inode_info *pipe;
	47	};
	48	union {
	49	unsigned long nr_segs;
27c0e374	50	struct {
8cefc107 DH	51	unsigned int head;
8cefc107 DH	52	unsigned int start_head;
27c0e374	53	};
7ff50620	54	loff_t xarray_start;
62a8067a	55	};
92236878 KO	56	};
92236878 KO	57
00e23707 DH	58	static inline enum iter_type iov_iter_type(const struct iov_iter *i)
00e23707 DH	59	{
8cd54c1c	60	return i->iter_type;
00e23707 DH	61	}
00e23707 DH	62
8fb0f47a JA	63	static inline void iov_iter_save_state(struct iov_iter *iter,
	64	struct iov_iter_state *state)
	65	{
	66	state->iov_offset = iter->iov_offset;
	67	state->count = iter->count;
	68	state->nr_segs = iter->nr_segs;
	69	}
	70
00e23707 DH	71	static inline bool iter_is_iovec(const struct iov_iter *i)
	72	{
	73	return iov_iter_type(i) == ITER_IOVEC;
	74	}
	75
	76	static inline bool iov_iter_is_kvec(const struct iov_iter *i)
	77	{
	78	return iov_iter_type(i) == ITER_KVEC;
	79	}
	80
	81	static inline bool iov_iter_is_bvec(const struct iov_iter *i)
	82	{
	83	return iov_iter_type(i) == ITER_BVEC;
	84	}
	85
	86	static inline bool iov_iter_is_pipe(const struct iov_iter *i)
	87	{
	88	return iov_iter_type(i) == ITER_PIPE;
	89	}
	90
9ea9ce04 DH	91	static inline bool iov_iter_is_discard(const struct iov_iter *i)
	92	{
	93	return iov_iter_type(i) == ITER_DISCARD;
	94	}
	95
7ff50620 DH	96	static inline bool iov_iter_is_xarray(const struct iov_iter *i)
	97	{
	98	return iov_iter_type(i) == ITER_XARRAY;
	99	}
	100
00e23707 DH	101	static inline unsigned char iov_iter_rw(const struct iov_iter *i)
00e23707 DH	102	{
8cd54c1c	103	return i->data_source ? WRITE : READ;
00e23707 DH	104	}
00e23707 DH	105
1da177e4 LT	106	/*
	107	* Total number of bytes covered by an iovec.
	108	*
	109	* NOTE that it is not safe to use this function until all the iovec's
	110	* segment lengths have been validated. Because the individual lengths can
	111	* overflow a size_t when added together.
	112	*/
	113	static inline size_t iov_length(const struct iovec *iov, unsigned long nr_segs)
	114	{
	115	unsigned long seg;
	116	size_t ret = 0;
	117
	118	for (seg = 0; seg < nr_segs; seg++)
	119	ret += iov[seg].iov_len;
	120	return ret;
	121	}
	122
92236878 KO	123	static inline struct iovec iov_iter_iovec(const struct iov_iter *iter)
	124	{
	125	return (struct iovec) {
	126	.iov_base = iter->iov->iov_base + iter->iov_offset,
	127	.iov_len = min(iter->count,
	128	iter->iov->iov_len - iter->iov_offset),
	129	};
	130	}
	131
f0b65f39 AV	132	size_t copy_page_from_iter_atomic(struct page *page, unsigned offset,
f0b65f39 AV	133	size_t bytes, struct iov_iter *i);
92236878	134	void iov_iter_advance(struct iov_iter *i, size_t bytes);
27c0e374	135	void iov_iter_revert(struct iov_iter *i, size_t bytes);
a6294593	136	size_t fault_in_iov_iter_readable(const struct iov_iter *i, size_t bytes);
cdd591fc	137	size_t fault_in_iov_iter_writeable(const struct iov_iter *i, size_t bytes);
92236878	138	size_t iov_iter_single_seg_count(const struct iov_iter *i);
6e58e79d AV	139	size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
6e58e79d AV	140	struct iov_iter *i);
f0d1bec9 AV	141	size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes,
f0d1bec9 AV	142	struct iov_iter *i);
aa28de27 AV	143
	144	size_t _copy_to_iter(const void addr, size_t bytes, struct iov_iter i);
	145	size_t _copy_from_iter(void addr, size_t bytes, struct iov_iter i);
aa28de27	146	size_t _copy_from_iter_nocache(void addr, size_t bytes, struct iov_iter i);
aa28de27 AV	147
	148	static __always_inline __must_check
	149	size_t copy_to_iter(const void addr, size_t bytes, struct iov_iter i)
	150	{
	151	if (unlikely(!check_copy_size(addr, bytes, true)))
c43aeb19	152	return 0;
aa28de27 AV	153	else
	154	return _copy_to_iter(addr, bytes, i);
	155	}
	156
	157	static __always_inline __must_check
	158	size_t copy_from_iter(void addr, size_t bytes, struct iov_iter i)
	159	{
	160	if (unlikely(!check_copy_size(addr, bytes, false)))
c43aeb19	161	return 0;
aa28de27 AV	162	else
	163	return _copy_from_iter(addr, bytes, i);
	164	}
	165
	166	static __always_inline __must_check
	167	bool copy_from_iter_full(void addr, size_t bytes, struct iov_iter i)
	168	{
4b6c132b AV	169	size_t copied = copy_from_iter(addr, bytes, i);
	170	if (likely(copied == bytes))
	171	return true;
	172	iov_iter_revert(i, copied);
	173	return false;
aa28de27 AV	174	}
	175
	176	static __always_inline __must_check
	177	size_t copy_from_iter_nocache(void addr, size_t bytes, struct iov_iter i)
	178	{
	179	if (unlikely(!check_copy_size(addr, bytes, false)))
c43aeb19	180	return 0;
aa28de27 AV	181	else
	182	return _copy_from_iter_nocache(addr, bytes, i);
	183	}
	184
	185	static __always_inline __must_check
	186	bool copy_from_iter_full_nocache(void addr, size_t bytes, struct iov_iter i)
	187	{
4b6c132b AV	188	size_t copied = copy_from_iter_nocache(addr, bytes, i);
	189	if (likely(copied == bytes))
	190	return true;
	191	iov_iter_revert(i, copied);
	192	return false;
aa28de27 AV	193	}
aa28de27 AV	194
0aed55af DW	195	#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
	196	/*
	197	* Note, users like pmem that depend on the stricter semantics of
	198	* copy_from_iter_flushcache() than copy_from_iter_nocache() must check for
	199	* IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) before assuming that the
	200	* destination is flushed from the cache on return.
	201	*/
6a37e940	202	size_t _copy_from_iter_flushcache(void addr, size_t bytes, struct iov_iter i);
0aed55af	203	#else
6a37e940 LT	204	#define _copy_from_iter_flushcache _copy_from_iter_nocache
	205	#endif
	206
ec6347bb DW	207	#ifdef CONFIG_ARCH_HAS_COPY_MC
ec6347bb DW	208	size_t _copy_mc_to_iter(const void addr, size_t bytes, struct iov_iter i);
8780356e	209	#else
ec6347bb	210	#define _copy_mc_to_iter _copy_to_iter
8780356e DW	211	#endif
8780356e DW	212
6a37e940 LT	213	static __always_inline __must_check
6a37e940 LT	214	size_t copy_from_iter_flushcache(void addr, size_t bytes, struct iov_iter i)
0aed55af	215	{
6a37e940	216	if (unlikely(!check_copy_size(addr, bytes, false)))
c43aeb19	217	return 0;
6a37e940 LT	218	else
6a37e940 LT	219	return _copy_from_iter_flushcache(addr, bytes, i);
0aed55af	220	}
6a37e940	221
8780356e	222	static __always_inline __must_check
ec6347bb	223	size_t copy_mc_to_iter(void addr, size_t bytes, struct iov_iter i)
8780356e	224	{
dfb06cba	225	if (unlikely(!check_copy_size(addr, bytes, true)))
8780356e DW	226	return 0;
8780356e DW	227	else
ec6347bb	228	return _copy_mc_to_iter(addr, bytes, i);
8780356e DW	229	}
8780356e DW	230
c35e0248	231	size_t iov_iter_zero(size_t bytes, struct iov_iter *);
886a3911	232	unsigned long iov_iter_alignment(const struct iov_iter *i);
357f435d	233	unsigned long iov_iter_gap_alignment(const struct iov_iter *i);
aa563d7b	234	void iov_iter_init(struct iov_iter i, unsigned int direction, const struct iovec iov,
71d8e532	235	unsigned long nr_segs, size_t count);
aa563d7b	236	void iov_iter_kvec(struct iov_iter i, unsigned int direction, const struct kvec kvec,
05afcb77	237	unsigned long nr_segs, size_t count);
aa563d7b	238	void iov_iter_bvec(struct iov_iter i, unsigned int direction, const struct bio_vec bvec,
abb78f87	239	unsigned long nr_segs, size_t count);
aa563d7b	240	void iov_iter_pipe(struct iov_iter i, unsigned int direction, struct pipe_inode_info pipe,
241699cd	241	size_t count);
9ea9ce04	242	void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count);
7ff50620 DH	243	void iov_iter_xarray(struct iov_iter i, unsigned int direction, struct xarray xarray,
7ff50620 DH	244	loff_t start, size_t count);
7b2c99d1	245	ssize_t iov_iter_get_pages(struct iov_iter i, struct page *pages,
2c80929c	246	size_t maxsize, unsigned maxpages, size_t *start);
91f79c43 AV	247	ssize_t iov_iter_get_pages_alloc(struct iov_iter i, struct page **pages,
91f79c43 AV	248	size_t maxsize, size_t *start);
f67da30c	249	int iov_iter_npages(const struct iov_iter *i, int maxpages);
8fb0f47a	250	void iov_iter_restore(struct iov_iter i, struct iov_iter_state state);
92236878	251
4b8164b9 AV	252	const void dup_iter(struct iov_iter new, struct iov_iter *old, gfp_t flags);
4b8164b9 AV	253
b57332b4	254	static inline size_t iov_iter_count(const struct iov_iter *i)
92236878 KO	255	{
	256	return i->count;
	257	}
	258
0b86dbf6 AV	259	/*
	260	* Cap the iov_iter by given limit; note that the second argument is
	261	* not the new size - it's upper limit for such. Passing it a value
	262	* greater than the amount of data in iov_iter is fine - it'll just do
	263	* nothing in that case.
	264	*/
	265	static inline void iov_iter_truncate(struct iov_iter *i, u64 count)
0c949334	266	{
0b86dbf6 AV	267	/*
	268	* count doesn't have to fit in size_t - comparison extends both
	269	* operands to u64 here and any value that would be truncated by
	270	* conversion in assignement is by definition greater than all
	271	* values of size_t, including old i->count.
	272	*/
7dedd3e1	273	if (i->count > count)
0c949334 AV	274	i->count = count;
	275	}
	276
b42b15fd AV	277	/*
	278	* reexpand a previously truncated iterator; count must be no more than how much
	279	* we had shrunk it.
	280	*/
	281	static inline void iov_iter_reexpand(struct iov_iter *i, size_t count)
	282	{
	283	i->count = count;
	284	}
52cbd23a WB	285
	286	struct csum_state {
	287	__wsum csum;
	288	size_t off;
	289	};
	290
	291	size_t csum_and_copy_to_iter(const void addr, size_t bytes, void csstate, struct iov_iter *i);
a604ec7e	292	size_t csum_and_copy_from_iter(void addr, size_t bytes, __wsum csum, struct iov_iter *i);
4b6c132b AV	293
	294	static __always_inline __must_check
	295	bool csum_and_copy_from_iter_full(void *addr, size_t bytes,
	296	__wsum csum, struct iov_iter i)
	297	{
	298	size_t copied = csum_and_copy_from_iter(addr, bytes, csum, i);
	299	if (likely(copied == bytes))
	300	return true;
	301	iov_iter_revert(i, copied);
	302	return false;
	303	}
d05f4435 SG	304	size_t hash_and_copy_to_iter(const void addr, size_t bytes, void hashp,
d05f4435 SG	305	struct iov_iter *i);
b42b15fd	306
bfdc5970 CH	307	struct iovec iovec_from_user(const struct iovec __user uvector,
	308	unsigned long nr_segs, unsigned long fast_segs,
	309	struct iovec *fast_iov, bool compat);
	310	ssize_t import_iovec(int type, const struct iovec __user *uvec,
	311	unsigned nr_segs, unsigned fast_segs, struct iovec **iovp,
	312	struct iov_iter *i);
	313	ssize_t __import_iovec(int type, const struct iovec __user *uvec,
	314	unsigned nr_segs, unsigned fast_segs, struct iovec **iovp,
	315	struct iov_iter *i, bool compat);
bc917be8 AV	316	int import_single_range(int type, void __user *buf, size_t len,
	317	struct iovec iov, struct iov_iter i);
	318
812ed032	319	#endif