cregit-Linux how code gets into the kernel

Release 4.12 include/linux/uio.h

Directory: include/linux
/*
 *      Berkeley style UIO structures   -       Alan Cox 1994.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */
#ifndef __LINUX_UIO_H

#define __LINUX_UIO_H

#include <linux/kernel.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_IOVEC = 0,
	
ITER_KVEC = 2,
	
ITER_BVEC = 4,
	
ITER_PIPE = 8,
};


struct iov_iter {
	
int type;
	
size_t iov_offset;
	
size_t count;
	union {
		
const struct iovec *iov;
		
const struct kvec *kvec;
		
const struct bio_vec *bvec;
		
struct pipe_inode_info *pipe;
	};
	union {
		
unsigned long nr_segs;
		struct {
			
int idx;
			
int start_idx;
		};
	};
};

/*
 * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton51100.00%1100.00%
Total51100.00%1100.00%


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), }; }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet54100.00%1100.00%
Total54100.00%1100.00%

#define iov_for_each(iov, iter, start) \ if (!((start).type & (ITER_BVEC | ITER_PIPE))) \ for (iter = (start); \ (iter).count && \ ((iov = iov_iter_iovec(&(iter))), 1); \ iov_iter_advance(&(iter), (iov).iov_len)) unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to); size_t iov_iter_copy_from_user_atomic(struct page *page, struct iov_iter *i, unsigned long offset, size_t bytes); void iov_iter_advance(struct iov_iter *i, size_t bytes); void iov_iter_revert(struct iov_iter *i, size_t bytes); int iov_iter_fault_in_readable(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); bool copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i); size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i); bool copy_from_iter_full_nocache(void *addr, size_t bytes, struct iov_iter *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, int direction, const struct iovec *iov, unsigned long nr_segs, size_t count); void iov_iter_kvec(struct iov_iter *i, int direction, const struct kvec *kvec, unsigned long nr_segs, size_t count); void iov_iter_bvec(struct iov_iter *i, int direction, const struct bio_vec *bvec, unsigned long nr_segs, size_t count); void iov_iter_pipe(struct iov_iter *i, int direction, struct pipe_inode_info *pipe, 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); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet1794.44%150.00%
Al Viro15.56%150.00%
Total18100.00%2100.00%


static inline bool iter_is_iovec(const struct iov_iter *i) { return !(i->type & (ITER_BVEC | ITER_KVEC | ITER_PIPE)); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro29100.00%3100.00%
Total29100.00%3100.00%

/* * Get one of READ or WRITE out of iter->type without any other flags OR'd in * with it. * * The ?: is just for type safety. */ #define iov_iter_rw(i) ((0 ? (struct iov_iter *)0 : (i))->type & (READ | WRITE)) /* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro30100.00%2100.00%
Total30100.00%2100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro21100.00%1100.00%
Total21100.00%1100.00%

size_t csum_and_copy_to_iter(const void *addr, size_t bytes, __wsum *csum, struct iov_iter *i); size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i); bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i); int import_iovec(int type, const struct iovec __user * uvector, unsigned nr_segs, unsigned fast_segs, struct iovec **iov, struct iov_iter *i); #ifdef CONFIG_COMPAT struct compat_iovec; int compat_import_iovec(int type, const struct compat_iovec __user * uvector, unsigned nr_segs, unsigned fast_segs, struct iovec **iov, struct iov_iter *i); #endif int import_single_range(int type, void __user *buf, size_t len, struct iovec *iov, struct iov_iter *i); #endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Al Viro59365.38%2771.05%
Kent Overstreet17319.07%12.63%
Andrew Morton697.61%25.26%
Matthew Wilcox434.74%12.63%
Linus Torvalds (pre-git)101.10%25.26%
Omar Sandoval70.77%12.63%
Anton Altaparmakov60.66%12.63%
Miklos Szeredi30.33%12.63%
David Howells20.22%12.63%
Christoph Hellwig10.11%12.63%
Total907100.00%38100.00%
Directory: include/linux
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