From 5abc97aa25b2c41413b3a520faee83f2282d9f18 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 30 Mar 2006 15:16:46 +0200 Subject: [PATCH] splice: add support for SPLICE_F_MOVE flag 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 Signed-off-by: Linus Torvalds --- include/linux/pipe_fs_i.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/linux') diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h index b12e59c..75c7f55 100644 --- a/include/linux/pipe_fs_i.h +++ b/include/linux/pipe_fs_i.h @@ -9,6 +9,7 @@ struct pipe_buffer { struct page *page; unsigned int offset, len; struct pipe_buf_operations *ops; + unsigned int stolen; }; struct pipe_buf_operations { @@ -16,6 +17,7 @@ struct pipe_buf_operations { void * (*map)(struct file *, struct pipe_inode_info *, struct pipe_buffer *); void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *); void (*release)(struct pipe_inode_info *, struct pipe_buffer *); + int (*steal)(struct pipe_inode_info *, struct pipe_buffer *); }; struct pipe_inode_info { @@ -53,4 +55,10 @@ void pipe_wait(struct inode * inode); struct inode* pipe_new(struct inode* inode); void free_pipe_info(struct inode* inode); +/* + * 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 */ + #endif -- cgit v1.1