diff options
Diffstat (limited to 'include/linux/pipe_fs_i.h')
-rw-r--r-- | include/linux/pipe_fs_i.h | 21 |
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 | */ | ||
17 | struct pipe_buf_operations { | 29 | struct 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); | |||
50 | void free_pipe_info(struct inode * inode); | 63 | void free_pipe_info(struct inode * inode); |
51 | void __free_pipe_info(struct pipe_inode_info *); | 64 | void __free_pipe_info(struct pipe_inode_info *); |
52 | 65 | ||
66 | /* Generic pipe buffer ops functions */ | ||
67 | void *generic_pipe_buf_map(struct pipe_inode_info *, struct pipe_buffer *); | ||
68 | void generic_pipe_buf_unmap(struct pipe_inode_info *, struct pipe_buffer *); | ||
69 | void generic_pipe_buf_get(struct pipe_inode_info *, struct pipe_buffer *); | ||
70 | int 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. |