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| author | Jens Axboe <axboe@suse.de> | 2006-03-30 15:16:46 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-30 12:28:18 -0800 |
| commit | 5abc97aa25b2c41413b3a520faee83f2282d9f18 (patch) | |
| tree | 4ba13ae0e91f15d02986df7cdca5e9455212d7d4 /include/linux/pipe_fs_i.h | |
| parent | 5274f052e7b3dbd81935772eb551dfd0325dfa9d (diff) | |
| download | lwn-5abc97aa25b2c41413b3a520faee83f2282d9f18.tar.gz lwn-5abc97aa25b2c41413b3a520faee83f2282d9f18.zip | |
[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 <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/pipe_fs_i.h')
| -rw-r--r-- | include/linux/pipe_fs_i.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h index b12e59c75752..75c7f55023ab 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 |