mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
3.0 KiB
96 lines
3.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
/* |
|
* Function declerations and data structures related to the splice |
|
* implementation. |
|
* |
|
* Copyright (C) 2007 Jens Axboe <[email protected]> |
|
* |
|
*/ |
|
#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 *); |
|
extern long do_splice(struct file *in, loff_t *off_in, |
|
struct file *out, loff_t *off_out, |
|
size_t len, unsigned int flags); |
|
|
|
extern long do_tee(struct file *in, struct file *out, 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
|
|
|