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