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| author | David Woodhouse <dwmw2@infradead.org> | 2007-07-11 17:55:48 +0400 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2007-07-11 17:55:48 +0400 |
| commit | db1b39d8b860e3716620c225bc86e0ec41764e34 (patch) | |
| tree | 8739074db733ef767400ea92cfbfed9352ddb92d /include/linux/splice.h | |
| parent | a6bc432e296dfa1f05d4b586ca5ca3085a2d42d7 (diff) | |
| parent | 4eb6bf6bfb580afaf1e1a1d30cba17a078530cf4 (diff) | |
| download | linux-db1b39d8b860e3716620c225bc86e0ec41764e34.tar.xz | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'include/linux/splice.h')
| -rw-r--r-- | include/linux/splice.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/include/linux/splice.h b/include/linux/splice.h new file mode 100644 index 000000000000..33e447f98a54 --- /dev/null +++ b/include/linux/splice.h @@ -0,0 +1,73 @@ +/* + * 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> + +/* + * splice is tied to pipes as a transport (at least for now), so we'll just + * add the splice flags here. + */ +#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 { + unsigned int len, total_len; /* current and remaining 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 */ +}; + +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 pages in map */ + unsigned int flags; /* splice flags */ + const struct pipe_buf_operations *ops;/* ops associated with output pipe */ +}; + +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 splice_direct_to_actor(struct file *, struct splice_desc *, + splice_direct_actor *); + +#endif |