1 /* 2 * 1999 Copyright (C) Pavel Machek, pavel (at) 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 (at) 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 #define MAX_NBD 128 39 40 /* userspace doesn't need the nbd_device structure */ 41 42 /* These are sent over the network in the request/reply magic fields */ 43 44 #define NBD_REQUEST_MAGIC 0x25609513 45 #define NBD_REPLY_MAGIC 0x67446698 46 /* Do *not* use magics: 0x12560953 0x96744668. */ 47 48 /* 49 * This is the packet used for communication between client and 50 * server. All data are in network byte order. 51 */ 52 struct nbd_request { 53 __be32 magic; 54 __be32 type; /* == READ || == WRITE */ 55 char handle[8]; 56 __be64 from; 57 __be32 len; 58 } 59 #ifdef __GNUC__ 60 __attribute__ ((packed)) 61 #endif 62 ; 63 64 /* 65 * This is the reply packet that nbd-server sends back to the client after 66 * it has completed an I/O request (or an error occurs). 67 */ 68 struct nbd_reply { 69 __be32 magic; 70 __be32 error; /* 0 = ok, else error */ 71 char handle[8]; /* handle you got from request */ 72 }; 73 #endif 74
