cregit-Linux how code gets into the kernel

Release 4.12 include/linux/splice.h

Directory: include/linux
/*
 * Function declerations and data structures related to the splice
 * implementation.
 *
 * Copyright (C) 2007 Jens Axboe <jens.axboe@oracle.com>
 *
 */
#ifndef SPLICE_H

#define SPLICE_H

#include <linux/pipe_fs_i.h>

/*
 * Flags passed in from splice/tee/vmsplice
 */

#define SPLICE_F_MOVE	(0x01)	
/* move pages instead of copying */

#define SPLICE_F_NONBLOCK (0x02) 
/* don't block on the pipe splicing (but */
				 /* we may still block on the fd we splice */
				 /* from/to, of course */

#define SPLICE_F_MORE	(0x04)	
/* expect more data */

#define SPLICE_F_GIFT	(0x08)	
/* pages passed in are a gift */


#define SPLICE_F_ALL (SPLICE_F_MOVE|SPLICE_F_NONBLOCK|SPLICE_F_MORE|SPLICE_F_GIFT)

/*
 * Passed to the actors
 */

struct splice_desc {
	
size_t total_len;		/* remaining length */
	
unsigned int len;		/* current length */
	
unsigned int flags;		/* splice flags */
	/*
         * actor() private data
         */
	union {
		
void __user *userptr;	/* memory to write to */
		
struct file *file;	/* file to read/write */
		
void *data;		/* cookie */
	
} u;
	
loff_t pos;			/* file position */
	
loff_t *opos;			/* sendfile: output position */
	
size_t num_spliced;		/* number of bytes already spliced */
	
bool need_wakeup;		/* need to wake up writer */
};


struct partial_page {
	
unsigned int offset;
	
unsigned int len;
	
unsigned long private;
};

/*
 * Passed to splice_to_pipe
 */

struct splice_pipe_desc {
	
struct page **pages;		/* page map */
	
struct partial_page *partial;	/* pages[] may not be contig */
	
int nr_pages;			/* number of populated pages in map */
	
unsigned int nr_pages_max;	/* pages[] & partial[] arrays size */
	
const struct pipe_buf_operations *ops;/* ops associated with output pipe */
	
void (*spd_release)(struct splice_pipe_desc *, unsigned int);
};


typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *,
			   struct splice_desc *);

typedef int (splice_direct_actor)(struct pipe_inode_info *,
				  struct splice_desc *);

extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *,
				loff_t *, size_t, unsigned int,
				splice_actor *);
extern ssize_t __splice_from_pipe(struct pipe_inode_info *,
				  struct splice_desc *, splice_actor *);
extern ssize_t splice_to_pipe(struct pipe_inode_info *,
			      struct splice_pipe_desc *);
extern ssize_t add_to_pipe(struct pipe_inode_info *,
			      struct pipe_buffer *);
extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *,
				      splice_direct_actor *);

/*
 * for dynamic pipe sizing
 */
extern int splice_grow_spd(const struct pipe_inode_info *, struct splice_pipe_desc *);
extern void splice_shrink_spd(struct splice_pipe_desc *);

extern const struct pipe_buf_operations page_cache_pipe_buf_ops;
extern const struct pipe_buf_operations default_pipe_buf_ops;
#endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe26382.97%538.46%
Al Viro288.83%430.77%
Miklos Szeredi82.52%17.69%
Eric Dumazet72.21%17.69%
Hugh Dickins61.89%17.69%
Xiao Guangrong51.58%17.69%
Total317100.00%13100.00%
Directory: include/linux
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