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author | Jens Axboe <jens.axboe@oracle.com> | 2007-06-04 09:59:47 +0200 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2007-07-10 08:04:14 +0200 |
commit | d6b29d7cee064f28ca097e906de7453541351095 (patch) | |
tree | 16775787df194cb45b4ac712da1c240f48cae96e /include/linux/splice.h | |
parent | ebf9909343392c929d9943c04f421cd42e03b530 (diff) | |
download | linux-stable-d6b29d7cee064f28ca097e906de7453541351095.tar.gz linux-stable-d6b29d7cee064f28ca097e906de7453541351095.tar.bz2 linux-stable-d6b29d7cee064f28ca097e906de7453541351095.zip |
splice: divorce the splice structure/function definitions from the pipe header
We need to move even more stuff into the header so that folks can use
the splice_to_pipe() implementation instead of open-coding a lot of
pipe knowledge (see relay implementation), so move to our own header
file finally.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/splice.h')
-rw-r--r-- | include/linux/splice.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/include/linux/splice.h b/include/linux/splice.h new file mode 100644 index 000000000000..f8cc97f71cd0 --- /dev/null +++ b/include/linux/splice.h @@ -0,0 +1,72 @@ +/* + * 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; +}; + +/* + * 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 |