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[PATCH] splice: add support for SPLICE_F_MOVE flag

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This enables the caller to migrate pages from one address space page
cache to another.  In buzz word marketing, you can do zero-copy file
copies!

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 15:16:46 +02:00
committed by Linus Torvalds
parent 5274f052e7
commit 5abc97aa25
3 changed files with 98 additions and 35 deletions
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8
fs/pipe.c
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@@ -121,11 +121,19 @@ static void anon_pipe_buf_unmap(struct pipe_inode_info *info, struct pipe_buffer
kunmap(buf->page);
}
static int anon_pipe_buf_steal(struct pipe_inode_info *info,
struct pipe_buffer *buf)
{
buf->stolen = 1;
return 0;
}
static struct pipe_buf_operations anon_pipe_buf_ops = {
.can_merge = 1,
.map = anon_pipe_buf_map,
.unmap = anon_pipe_buf_unmap,
.release = anon_pipe_buf_release,
.steal = anon_pipe_buf_steal,
};
static ssize_t