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1 | /* |
2 | * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL. |
3 | * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne) |
4 | * Made nbd_end_request() use the io_request_lock |
5 | * 2001 Copyright (C) Steven Whitehouse |
6 | * New nbd_end_request() for compatibility with new linux block |
7 | * layer code. |
8 | * 2003/06/24 Louis D. Langholtz <ldl@aros.net> |
9 | * Removed unneeded blksize_bits field from nbd_device struct. |
10 | * Cleanup PARANOIA usage & code. |
11 | * 2004/02/19 Paul Clements |
12 | * Removed PARANOIA, plus various cleanup and comments |
13 | */ |
14 | |
15 | #ifndef LINUX_NBD_H |
16 | #define LINUX_NBD_H |
17 | |
18 | #include <linux/types.h> |
19 | |
20 | #define NBD_SET_SOCK _IO( 0xab, 0 ) |
21 | #define NBD_SET_BLKSIZE _IO( 0xab, 1 ) |
22 | #define NBD_SET_SIZE _IO( 0xab, 2 ) |
23 | #define NBD_DO_IT _IO( 0xab, 3 ) |
24 | #define NBD_CLEAR_SOCK _IO( 0xab, 4 ) |
25 | #define NBD_CLEAR_QUE _IO( 0xab, 5 ) |
26 | #define NBD_PRINT_DEBUG _IO( 0xab, 6 ) |
27 | #define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 ) |
28 | #define NBD_DISCONNECT _IO( 0xab, 8 ) |
29 | #define NBD_SET_TIMEOUT _IO( 0xab, 9 ) |
30 | |
31 | enum { |
32 | NBD_CMD_READ = 0, |
33 | NBD_CMD_WRITE = 1, |
34 | NBD_CMD_DISC = 2 |
35 | }; |
36 | |
37 | #define nbd_cmd(req) ((req)->cmd[0]) |
38 | |
39 | /* userspace doesn't need the nbd_device structure */ |
40 | #ifdef __KERNEL__ |
41 | |
42 | #include <linux/wait.h> |
43 | #include <linux/mutex.h> |
44 | |
45 | /* values for flags field */ |
46 | #define NBD_READ_ONLY 0x0001 |
47 | #define NBD_WRITE_NOCHK 0x0002 |
48 | |
49 | struct request; |
50 | |
51 | struct nbd_device { |
52 | int flags; |
53 | int harderror; /* Code of hard error */ |
54 | struct socket * sock; |
55 | struct file * file; /* If == NULL, device is not ready, yet */ |
56 | int magic; |
57 | |
58 | spinlock_t queue_lock; |
59 | struct list_head queue_head; /* Requests waiting result */ |
60 | struct request *active_req; |
61 | wait_queue_head_t active_wq; |
62 | struct list_head waiting_queue; /* Requests to be sent */ |
63 | wait_queue_head_t waiting_wq; |
64 | |
65 | struct mutex tx_lock; |
66 | struct gendisk *disk; |
67 | int blksize; |
68 | u64 bytesize; |
69 | pid_t pid; /* pid of nbd-client, if attached */ |
70 | int xmit_timeout; |
71 | }; |
72 | |
73 | #endif |
74 | |
75 | /* These are sent over the network in the request/reply magic fields */ |
76 | |
77 | #define NBD_REQUEST_MAGIC 0x25609513 |
78 | #define NBD_REPLY_MAGIC 0x67446698 |
79 | /* Do *not* use magics: 0x12560953 0x96744668. */ |
80 | |
81 | /* |
82 | * This is the packet used for communication between client and |
83 | * server. All data are in network byte order. |
84 | */ |
85 | struct nbd_request { |
86 | __be32 magic; |
87 | __be32 type; /* == READ || == WRITE */ |
88 | char handle[8]; |
89 | __be64 from; |
90 | __be32 len; |
91 | } __attribute__((packed)); |
92 | |
93 | /* |
94 | * This is the reply packet that nbd-server sends back to the client after |
95 | * it has completed an I/O request (or an error occurs). |
96 | */ |
97 | struct nbd_reply { |
98 | __be32 magic; |
99 | __be32 error; /* 0 = ok, else error */ |
100 | char handle[8]; /* handle you got from request */ |
101 | }; |
102 | #endif |
103 |
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