From 5274f052e7b3dbd81935772eb551dfd0325dfa9d Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 30 Mar 2006 15:15:30 +0200 Subject: [PATCH] Introduce sys_splice() system call 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 Signed-off-by: Linus Torvalds --- net/socket.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'net/socket.c') diff --git a/net/socket.c b/net/socket.c index fcd77eac0cc..b13042f68c0 100644 --- a/net/socket.c +++ b/net/socket.c @@ -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, }; /* -- cgit v1.2.3