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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112/* SPDX-License-Identifier: GPL-2.0 *//* * 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; void (*splice_eof)(struct splice_desc *sd); /* Unexpected EOF handler */ 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 *);
ssize_t splice_from_pipe(struct pipe_inode_info *pipe, struct file *out, loff_t *ppos, size_t len, unsigned int flags, splice_actor *actor);ssize_t __splice_from_pipe(struct pipe_inode_info *pipe, struct splice_desc *sd, splice_actor *actor);ssize_t splice_to_pipe(struct pipe_inode_info *pipe, struct splice_pipe_desc *spd);ssize_t add_to_pipe(struct pipe_inode_info *pipe, struct pipe_buffer *buf);ssize_t vfs_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags);ssize_t splice_direct_to_actor(struct file *file, struct splice_desc *sd, splice_direct_actor *actor);ssize_t do_splice(struct file *in, loff_t *off_in, struct file *out, loff_t *off_out, size_t len, unsigned int flags);ssize_t do_splice_direct(struct file *in, loff_t *ppos, struct file *out, loff_t *opos, size_t len, unsigned int flags);ssize_t splice_file_range(struct file *in, loff_t *ppos, struct file *out, loff_t *opos, size_t len);
static inline long splice_copy_file_range(struct file *in, loff_t pos_in, struct file *out, loff_t pos_out, size_t len){ return splice_file_range(in, &pos_in, out, &pos_out, len);}
ssize_t do_tee(struct file *in, struct file *out, size_t len, unsigned int flags);ssize_t splice_to_socket(struct pipe_inode_info *pipe, struct file *out, loff_t *ppos, size_t len, unsigned int flags);
/* * 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