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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 | ||
0568b409 | 8 | #define PIPE_BUF_FLAG_LRU 0x01 |
3e7ee3e7 | 9 | |
1da177e4 LT |
10 | struct pipe_buffer { |
11 | struct page *page; | |
12 | unsigned int offset, len; | |
13 | struct pipe_buf_operations *ops; | |
3e7ee3e7 | 14 | unsigned int flags; |
1da177e4 LT |
15 | }; |
16 | ||
17 | struct pipe_buf_operations { | |
18 | int can_merge; | |
19 | void * (*map)(struct file *, struct pipe_inode_info *, struct pipe_buffer *); | |
20 | void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *); | |
21 | void (*release)(struct pipe_inode_info *, struct pipe_buffer *); | |
5abc97aa | 22 | int (*steal)(struct pipe_inode_info *, struct pipe_buffer *); |
70524490 | 23 | void (*get)(struct pipe_inode_info *, struct pipe_buffer *); |
1da177e4 LT |
24 | }; |
25 | ||
26 | struct pipe_inode_info { | |
27 | wait_queue_head_t wait; | |
28 | unsigned int nrbufs, curbuf; | |
29 | struct pipe_buffer bufs[PIPE_BUFFERS]; | |
30 | struct page *tmp_page; | |
31 | unsigned int start; | |
32 | unsigned int readers; | |
33 | unsigned int writers; | |
34 | unsigned int waiting_writers; | |
35 | unsigned int r_counter; | |
36 | unsigned int w_counter; | |
37 | struct fasync_struct *fasync_readers; | |
38 | struct fasync_struct *fasync_writers; | |
3a326a2c | 39 | struct inode *inode; |
1da177e4 LT |
40 | }; |
41 | ||
42 | /* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual | |
43 | memory allocation, whereas PIPE_BUF makes atomicity guarantees. */ | |
44 | #define PIPE_SIZE PAGE_SIZE | |
45 | ||
1da177e4 | 46 | /* Drop the inode semaphore and wait for a pipe event, atomically */ |
3a326a2c | 47 | void pipe_wait(struct pipe_inode_info *pipe); |
1da177e4 | 48 | |
3a326a2c IM |
49 | struct pipe_inode_info * alloc_pipe_info(struct inode * inode); |
50 | void free_pipe_info(struct inode * inode); | |
b92ce558 | 51 | void __free_pipe_info(struct pipe_inode_info *); |
1da177e4 | 52 | |
5abc97aa JA |
53 | /* |
54 | * splice is tied to pipes as a transport (at least for now), so we'll just | |
55 | * add the splice flags here. | |
56 | */ | |
57 | #define SPLICE_F_MOVE (0x01) /* move pages instead of copying */ | |
29e35094 LT |
58 | #define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */ |
59 | /* we may still block on the fd we splice */ | |
60 | /* from/to, of course */ | |
b2b39fa4 | 61 | #define SPLICE_F_MORE (0x04) /* expect more data */ |
5abc97aa | 62 | |
00522fb4 JA |
63 | /* |
64 | * Passed to the actors | |
65 | */ | |
66 | struct splice_desc { | |
67 | unsigned int len, total_len; /* current and remaining length */ | |
68 | unsigned int flags; /* splice flags */ | |
69 | struct file *file; /* file to read/write */ | |
70 | loff_t pos; /* file position */ | |
71 | }; | |
72 | ||
73 | typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *, | |
74 | struct splice_desc *); | |
75 | ||
76 | extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *, | |
77 | loff_t *, size_t, unsigned int, | |
78 | splice_actor *); | |
79 | ||
1da177e4 | 80 | #endif |