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Index of /FSS-OZR/root/lib/modules/5.14.0-687.26.1.el9_8.x86_64/source/drivers/rapidio
Index of /FSS-OZR/root/lib/modules/5.14.0-687.26.1.el9_8.x86_64/source/drivers/rapidio
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„Ÿ}ïÊ¿Ï 2Æ I/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Berkeley style UIO structures - Alan Cox 1994.
*/
#ifndef __LINUX_UIO_H
#define __LINUX_UIO_H
#include
#include
#include
#include
struct page;
struct pipe_inode_info;
typedef unsigned int __bitwise iov_iter_extraction_t;
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,
ITER_UBUF,
};
#define ITER_SOURCE 1 // == WRITE
#define ITER_DEST 0 // == READ
struct iov_iter_state {
size_t iov_offset;
size_t count;
unsigned long nr_segs;
};
struct iov_iter {
u8 iter_type;
bool nofault;
bool data_source;
bool user_backed;
union {
size_t iov_offset;
int last_offset;
};
/*
* Hack alert: overlay ubuf_iovec with iovec + count, so
* that the members resolve correctly regardless of the type
* of iterator used. This means that you can use:
*
* &iter->__ubuf_iovec or iter->__iov
*
* interchangably for the user_backed cases, hence simplifying
* some of the cases that need to deal with both.
*/
union {
/*
* This really should be a const, but we cannot do that without
* also modifying any of the zero-filling iter init functions.
* Leave it non-const for now, but it should be treated as such.
*/
struct iovec __ubuf_iovec;
struct {
union {
/* use iter_iov() to get the current vec */
const struct iovec *__iov;
const struct kvec *kvec;
const struct bio_vec *bvec;
struct xarray *xarray;
struct pipe_inode_info *pipe;
void __user *ubuf;
};
size_t count;
};
};
union {
unsigned long nr_segs;
struct {
unsigned int head;
unsigned int start_head;
};
loff_t xarray_start;
};
};
typedef __u16 uio_meta_flags_t;
struct uio_meta {
uio_meta_flags_t flags;
u16 app_tag;
u64 seed;
struct iov_iter iter;
};
static inline const struct iovec *iter_iov(const struct iov_iter *iter)
{
if (iter->iter_type == ITER_UBUF)
return (const struct iovec *) &iter->__ubuf_iovec;
return iter->__iov;
}
#define iter_iov_addr(iter) (iter_iov(iter)->iov_base + (iter)->iov_offset)
#define iter_iov_len(iter) (iter_iov(iter)->iov_len - (iter)->iov_offset)
static inline enum iter_type iov_iter_type(const struct iov_iter *i)
{
return i->iter_type;
}