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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
include/linux/pipe_fs_i.h
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@ -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