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include/linux/splice.h
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/* * 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> /* |
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* Flags passed in from splice/tee/vmsplice |
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*/ #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 */ /* * Passed to the actors */ struct splice_desc { |
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size_t total_len; /* remaining length */ unsigned int len; /* current length */ |
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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 */ |
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loff_t *opos; /* sendfile: output position */ |
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size_t num_spliced; /* number of bytes already spliced */ bool need_wakeup; /* need to wake up writer */ |
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}; struct partial_page { unsigned int offset; unsigned int len; |
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unsigned long private; |
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}; /* * Passed to splice_to_pipe */ struct splice_pipe_desc { struct page **pages; /* page map */ struct partial_page *partial; /* pages[] may not be contig */ |
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int nr_pages; /* number of populated pages in map */ unsigned int nr_pages_max; /* pages[] & partial[] arrays size */ |
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unsigned int flags; /* splice flags */ const struct pipe_buf_operations *ops;/* ops associated with output pipe */ |
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void (*spd_release)(struct splice_pipe_desc *, unsigned int); |
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}; 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 *); |
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extern ssize_t add_to_pipe(struct pipe_inode_info *, struct pipe_buffer *); |
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extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *, splice_direct_actor *); |
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/* * for dynamic pipe sizing */ |
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extern int splice_grow_spd(const struct pipe_inode_info *, struct splice_pipe_desc *); extern void splice_shrink_spd(struct splice_pipe_desc *); |
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extern void spd_release_page(struct splice_pipe_desc *, unsigned int); |
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extern const struct pipe_buf_operations page_cache_pipe_buf_ops; |
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extern const struct pipe_buf_operations default_pipe_buf_ops; |
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#endif |