| 1 | /* |
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| 2 | * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL. |
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| 3 | * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne) |
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| 4 | * Made nbd_end_request() use the io_request_lock |
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| 5 | * 2001 Copyright (C) Steven Whitehouse |
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| 6 | * New nbd_end_request() for compatibility with new linux block |
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| 7 | * layer code. |
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| 8 | * 2003/06/24 Louis D. Langholtz <ldl@aros.net> |
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| 9 | * Removed unneeded blksize_bits field from nbd_device struct. |
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| 10 | * Cleanup PARANOIA usage & code. |
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| 11 | * 2004/02/19 Paul Clements |
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| 12 | * Removed PARANOIA, plus various cleanup and comments |
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| 13 | */ |
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| 14 | |
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| 15 | #ifndef LINUX_NBD_H |
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| 16 | #define LINUX_NBD_H |
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| 17 | |
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| 18 | #include <asm/types.h> |
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| 19 | |
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| 20 | #define NBD_SET_SOCK _IO( 0xab, 0 ) |
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| 21 | #define NBD_SET_BLKSIZE _IO( 0xab, 1 ) |
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| 22 | #define NBD_SET_SIZE _IO( 0xab, 2 ) |
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| 23 | #define NBD_DO_IT _IO( 0xab, 3 ) |
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| 24 | #define NBD_CLEAR_SOCK _IO( 0xab, 4 ) |
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| 25 | #define NBD_CLEAR_QUE _IO( 0xab, 5 ) |
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| 26 | #define NBD_PRINT_DEBUG _IO( 0xab, 6 ) |
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| 27 | #define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 ) |
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| 28 | #define NBD_DISCONNECT _IO( 0xab, 8 ) |
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| 29 | |
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| 30 | enum { |
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| 31 | NBD_CMD_READ = 0, |
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| 32 | NBD_CMD_WRITE = 1, |
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| 33 | NBD_CMD_DISC = 2 |
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| 34 | }; |
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| 35 | |
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| 36 | #define nbd_cmd(req) ((req)->cmd[0]) |
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| 37 | #define MAX_NBD 128 |
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| 38 | |
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| 39 | /* These are sent over the network in the request/reply magic fields */ |
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| 40 | |
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| 41 | #define NBD_REQUEST_MAGIC 0x25609513 |
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| 42 | #define NBD_REPLY_MAGIC 0x67446698 |
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| 43 | /* Do *not* use magics: 0x12560953 0x96744668. */ |
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| 44 | |
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| 45 | /* |
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| 46 | * This is the packet used for communication between client and |
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| 47 | * server. All data are in network byte order. |
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| 48 | */ |
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| 49 | struct nbd_request { |
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| 50 | __u32 magic; |
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| 51 | __u32 type; /* == READ || == WRITE */ |
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| 52 | char handle[8]; |
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| 53 | __u64 from; |
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| 54 | __u32 len; |
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| 55 | } |
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| 56 | #ifdef __GNUC__ |
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| 57 | __attribute__ ((packed)) |
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| 58 | #endif |
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| 59 | ; |
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| 60 | |
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| 61 | /* |
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| 62 | * This is the reply packet that nbd-server sends back to the client after |
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| 63 | * it has completed an I/O request (or an error occurs). |
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| 64 | */ |
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| 65 | struct nbd_reply { |
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| 66 | __u32 magic; |
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| 67 | __u32 error; /* 0 = ok, else error */ |
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| 68 | char handle[8]; /* handle you got from request */ |
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| 69 | }; |
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| 70 | #endif |
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