[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 <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ext3/file.c b/fs/ext3/file.c
index 783a796220bb..1efefb630ea9 100644
--- a/fs/ext3/file.c
+++ b/fs/ext3/file.c
@@ -119,6 +119,8 @@ const struct file_operations ext3_file_operations = {
         .release        = ext3_release_file,
         .fsync          = ext3_sync_file,
         .sendfile       = generic_file_sendfile,
+        .splice_read    = generic_file_splice_read,
+        .splice_write   = generic_file_splice_write,
 };
 
 struct inode_operations ext3_file_inode_operations = {