Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_PIPE_FS_I_H |
2 | #define _LINUX_PIPE_FS_I_H | |
3 | ||
4 | #define PIPEFS_MAGIC 0x50495045 | |
5 | ||
6 | #define PIPE_BUFFERS (16) | |
7 | ||
3e7ee3e7 JA |
8 | #define PIPE_BUF_FLAG_STOLEN 0x01 |
9 | #define PIPE_BUF_FLAG_LRU 0x02 | |
10 | ||
1da177e4 LT |
11 | struct pipe_buffer { |
12 | struct page *page; | |
13 | unsigned int offset, len; | |
14 | struct pipe_buf_operations *ops; | |
3e7ee3e7 | 15 | unsigned int flags; |
1da177e4 LT |
16 | }; |
17 | ||
18 | struct pipe_buf_operations { | |
19 | int can_merge; | |
20 | void * (*map)(struct file *, struct pipe_inode_info *, struct pipe_buffer *); | |
21 | void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *); | |
22 | void (*release)(struct pipe_inode_info *, struct pipe_buffer *); | |
5abc97aa | 23 | int (*steal)(struct pipe_inode_info *, struct pipe_buffer *); |
70524490 | 24 | void (*get)(struct pipe_inode_info *, struct pipe_buffer *); |
1da177e4 LT |
25 | }; |
26 | ||
27 | struct pipe_inode_info { | |
28 | wait_queue_head_t wait; | |
29 | unsigned int nrbufs, curbuf; | |
30 | struct pipe_buffer bufs[PIPE_BUFFERS]; | |
31 | struct page *tmp_page; | |
32 | unsigned int start; | |
33 | unsigned int readers; | |
34 | unsigned int writers; | |
35 | unsigned int waiting_writers; | |
36 | unsigned int r_counter; | |
37 | unsigned int w_counter; | |
38 | struct fasync_struct *fasync_readers; | |
39 | struct fasync_struct *fasync_writers; | |
3a326a2c | 40 | struct inode *inode; |
1da177e4 LT |
41 | }; |
42 | ||
43 | /* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual | |
44 | memory allocation, whereas PIPE_BUF makes atomicity guarantees. */ | |
45 | #define PIPE_SIZE PAGE_SIZE | |
46 | ||
1da177e4 | 47 | /* Drop the inode semaphore and wait for a pipe event, atomically */ |
3a326a2c | 48 | void pipe_wait(struct pipe_inode_info *pipe); |
1da177e4 | 49 | |
3a326a2c IM |
50 | struct pipe_inode_info * alloc_pipe_info(struct inode * inode); |
51 | void free_pipe_info(struct inode * inode); | |
b92ce558 | 52 | void __free_pipe_info(struct pipe_inode_info *); |
1da177e4 | 53 | |
5abc97aa JA |
54 | /* |
55 | * splice is tied to pipes as a transport (at least for now), so we'll just | |
56 | * add the splice flags here. | |
57 | */ | |
58 | #define SPLICE_F_MOVE (0x01) /* move pages instead of copying */ | |
29e35094 LT |
59 | #define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */ |
60 | /* we may still block on the fd we splice */ | |
61 | /* from/to, of course */ | |
b2b39fa4 | 62 | #define SPLICE_F_MORE (0x04) /* expect more data */ |
5abc97aa | 63 | |
1da177e4 | 64 | #endif |