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-rw-r--r--include/linux/pipe_fs_i.h21
1 files changed, 20 insertions, 1 deletions
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 3130977fc6ab..b8aae1fc5185 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -14,10 +14,23 @@ struct pipe_buffer {
14 unsigned int flags; 14 unsigned int flags;
15}; 15};
16 16
17/*
18 * Note on the nesting of these functions:
19 *
20 * ->pin()
21 * ->steal()
22 * ...
23 * ->map()
24 * ...
25 * ->unmap()
26 *
27 * That is, ->map() must be called on a pinned buffer, same goes for ->steal().
28 */
17struct pipe_buf_operations { 29struct pipe_buf_operations {
18 int can_merge; 30 int can_merge;
19 void * (*map)(struct file *, struct pipe_inode_info *, struct pipe_buffer *); 31 void * (*map)(struct pipe_inode_info *, struct pipe_buffer *);
20 void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *); 32 void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *);
33 int (*pin)(struct pipe_inode_info *, struct pipe_buffer *);
21 void (*release)(struct pipe_inode_info *, struct pipe_buffer *); 34 void (*release)(struct pipe_inode_info *, struct pipe_buffer *);
22 int (*steal)(struct pipe_inode_info *, struct pipe_buffer *); 35 int (*steal)(struct pipe_inode_info *, struct pipe_buffer *);
23 void (*get)(struct pipe_inode_info *, struct pipe_buffer *); 36 void (*get)(struct pipe_inode_info *, struct pipe_buffer *);
@@ -50,6 +63,12 @@ struct pipe_inode_info * alloc_pipe_info(struct inode * inode);
50void free_pipe_info(struct inode * inode); 63void free_pipe_info(struct inode * inode);
51void __free_pipe_info(struct pipe_inode_info *); 64void __free_pipe_info(struct pipe_inode_info *);
52 65
66/* Generic pipe buffer ops functions */
67void *generic_pipe_buf_map(struct pipe_inode_info *, struct pipe_buffer *);
68void generic_pipe_buf_unmap(struct pipe_inode_info *, struct pipe_buffer *);
69void generic_pipe_buf_get(struct pipe_inode_info *, struct pipe_buffer *);
70int generic_pipe_buf_pin(struct pipe_inode_info *, struct pipe_buffer *);
71
53/* 72/*
54 * splice is tied to pipes as a transport (at least for now), so we'll just 73 * splice is tied to pipes as a transport (at least for now), so we'll just
55 * add the splice flags here. 74 * add the splice flags here.