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1da177e4 LT |
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 | ||
c751c1db MF |
18 | #include <linux/types.h> |
19 | ||
1da177e4 LT |
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 ) | |
7fdfd406 | 29 | #define NBD_SET_TIMEOUT _IO( 0xab, 9 ) |
1da177e4 LT |
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 | #define MAX_NBD 128 | |
39 | ||
40 | /* userspace doesn't need the nbd_device structure */ | |
41 | #ifdef __KERNEL__ | |
42 | ||
4b2f0260 | 43 | #include <linux/wait.h> |
82d4dc5a | 44 | #include <linux/mutex.h> |
4b2f0260 | 45 | |
1da177e4 LT |
46 | /* values for flags field */ |
47 | #define NBD_READ_ONLY 0x0001 | |
48 | #define NBD_WRITE_NOCHK 0x0002 | |
49 | ||
4b2f0260 HX |
50 | struct request; |
51 | ||
1da177e4 LT |
52 | struct nbd_device { |
53 | int flags; | |
54 | int harderror; /* Code of hard error */ | |
55 | struct socket * sock; | |
56 | struct file * file; /* If == NULL, device is not ready, yet */ | |
57 | int magic; | |
4b2f0260 | 58 | |
1da177e4 LT |
59 | spinlock_t queue_lock; |
60 | struct list_head queue_head;/* Requests are added here... */ | |
4b2f0260 HX |
61 | struct request *active_req; |
62 | wait_queue_head_t active_wq; | |
63 | ||
82d4dc5a | 64 | struct mutex tx_lock; |
1da177e4 LT |
65 | struct gendisk *disk; |
66 | int blksize; | |
67 | u64 bytesize; | |
6b39bb65 | 68 | pid_t pid; /* pid of nbd-client, if attached */ |
7fdfd406 | 69 | int xmit_timeout; |
1da177e4 LT |
70 | }; |
71 | ||
72 | #endif | |
73 | ||
74 | /* These are sent over the network in the request/reply magic fields */ | |
75 | ||
76 | #define NBD_REQUEST_MAGIC 0x25609513 | |
77 | #define NBD_REPLY_MAGIC 0x67446698 | |
78 | /* Do *not* use magics: 0x12560953 0x96744668. */ | |
79 | ||
80 | /* | |
81 | * This is the packet used for communication between client and | |
82 | * server. All data are in network byte order. | |
83 | */ | |
84 | struct nbd_request { | |
4ad3bcf3 AD |
85 | __be32 magic; |
86 | __be32 type; /* == READ || == WRITE */ | |
1da177e4 | 87 | char handle[8]; |
4ad3bcf3 AD |
88 | __be64 from; |
89 | __be32 len; | |
1da177e4 LT |
90 | } |
91 | #ifdef __GNUC__ | |
92 | __attribute__ ((packed)) | |
93 | #endif | |
94 | ; | |
95 | ||
96 | /* | |
97 | * This is the reply packet that nbd-server sends back to the client after | |
98 | * it has completed an I/O request (or an error occurs). | |
99 | */ | |
100 | struct nbd_reply { | |
4ad3bcf3 AD |
101 | __be32 magic; |
102 | __be32 error; /* 0 = ok, else error */ | |
1da177e4 LT |
103 | char handle[8]; /* handle you got from request */ |
104 | }; | |
105 | #endif |