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[PATCH] Introduce sys_splice() system call

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This adds support for the sys_splice system call. Using a pipe as a
transport, it can connect to files or sockets (latter as output only).

From the splice.c comments:

   "splice": joining two ropes together by interweaving their strands.

   This is the "extended pipe" functionality, where a pipe is used as
   an arbitrary in-memory buffer. Think of a pipe as a small kernel
   buffer that you can use to transfer data from one end to the other.

   The traditional unix read/write is extended with a "splice()" operation
   that transfers data buffers to or from a pipe buffer.

   Named by Larry McVoy, original implementation from Linus, extended by
   Jens to support splicing to files and fixing the initial implementation
   bugs.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jens Axboe 2006-03-30 15:15:30 +02:00 • committed by Linus Torvalds
parent 5d4fe2c1ce
commit 5274f052e7
15 changed files with 669 additions and 11 deletions
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6
net/socket.c
View file

@ -119,6 +119,9 @@ static ssize_t sock_writev(struct file *file, const struct iovec *vector,
static ssize_t sock_sendpage(struct file *file, struct page *page,
int offset, size_t size, loff_t *ppos, int more);
extern ssize_t generic_splice_sendpage(struct inode *inode, struct file *out,
size_t len, unsigned int flags);
/*
* Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
@ -141,7 +144,8 @@ static struct file_operations socket_file_ops = {
.fasync = sock_fasync,
.readv = sock_readv,
.writev = sock_writev,
.sendpage = sock_sendpage
.sendpage = sock_sendpage,
.splice_write = generic_splice_sendpage,
};
/*