Network Block Device 2.9.20
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00001 /* 00002 * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL. 00003 * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne) 00004 * Made nbd_end_request() use the io_request_lock 00005 * 2001 Copyright (C) Steven Whitehouse 00006 * New nbd_end_request() for compatibility with new linux block 00007 * layer code. 00008 * 2003/06/24 Louis D. Langholtz <ldl@aros.net> 00009 * Removed unneeded blksize_bits field from nbd_device struct. 00010 * Cleanup PARANOIA usage & code. 00011 * 2004/02/19 Paul Clements 00012 * Removed PARANOIA, plus various cleanup and comments 00013 */ 00014 00015 #ifndef LINUX_NBD_H 00016 #define LINUX_NBD_H 00017 00018 //#include <linux/types.h> 00019 00020 #define NBD_SET_SOCK _IO( 0xab, 0 ) 00021 #define NBD_SET_BLKSIZE _IO( 0xab, 1 ) 00022 #define NBD_SET_SIZE _IO( 0xab, 2 ) 00023 #define NBD_DO_IT _IO( 0xab, 3 ) 00024 #define NBD_CLEAR_SOCK _IO( 0xab, 4 ) 00025 #define NBD_CLEAR_QUE _IO( 0xab, 5 ) 00026 #define NBD_PRINT_DEBUG _IO( 0xab, 6 ) 00027 #define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 ) 00028 #define NBD_DISCONNECT _IO( 0xab, 8 ) 00029 #define NBD_SET_TIMEOUT _IO( 0xab, 9 ) 00030 00031 enum { 00032 NBD_CMD_READ = 0, 00033 NBD_CMD_WRITE = 1, 00034 NBD_CMD_DISC = 2 00035 }; 00036 00037 #define nbd_cmd(req) ((req)->cmd[0]) 00038 00039 /* userspace doesn't need the nbd_device structure */ 00040 00041 /* These are sent over the network in the request/reply magic fields */ 00042 00043 #define NBD_REQUEST_MAGIC 0x25609513 00044 #define NBD_REPLY_MAGIC 0x67446698 00045 /* Do *not* use magics: 0x12560953 0x96744668. */ 00046 00047 /* 00048 * This is the packet used for communication between client and 00049 * server. All data are in network byte order. 00050 */ 00051 struct nbd_request { 00052 __be32 magic; 00053 __be32 type; /* == READ || == WRITE */ 00054 char handle[8]; 00055 __be64 from; 00056 __be32 len; 00057 } __attribute__ ((packed)); 00058 00059 /* 00060 * This is the reply packet that nbd-server sends back to the client after 00061 * it has completed an I/O request (or an error occurs). 00062 */ 00063 struct nbd_reply { 00064 __be32 magic; 00065 __be32 error; /* 0 = ok, else error */ 00066 char handle[8]; /* handle you got from request */ 00067 }; 00068 #endif