1 /* 2 * 1999 Copyright (C) Pavel Machek, [email protected]. 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 <[email protected]> 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 _UAPILINUX_NBD_H 16 #define _UAPILINUX_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 #define NBD_SET_FLAGS _IO( 0xab, 10) 31 32 enum { 33 NBD_CMD_READ = 0, 34 NBD_CMD_WRITE = 1, 35 NBD_CMD_DISC = 2, 36 NBD_CMD_FLUSH = 3, 37 NBD_CMD_TRIM = 4 38 }; 39 40 /* values for flags field, these are server interaction specific. */ 41 #define NBD_FLAG_HAS_FLAGS (1 << 0) /* nbd-server supports flags */ 42 #define NBD_FLAG_READ_ONLY (1 << 1) /* device is read-only */ 43 #define NBD_FLAG_SEND_FLUSH (1 << 2) /* can flush writeback cache */ 44 #define NBD_FLAG_SEND_FUA (1 << 3) /* send FUA (forced unit access) */ 45 /* there is a gap here to match userspace */ 46 #define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */ 47 #define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* Server supports multiple connections per export. */ 48 49 /* values for cmd flags in the upper 16 bits of request type */ 50 #define NBD_CMD_FLAG_FUA (1 << 16) /* FUA (forced unit access) op */ 51 52 /* These are client behavior specific flags. */ 53 #define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0) /* delete the nbd device on 54 disconnect. */ 55 56 /* userspace doesn't need the nbd_device structure */ 57 58 /* These are sent over the network in the request/reply magic fields */ 59 60 #define NBD_REQUEST_MAGIC 0x25609513 61 #define NBD_REPLY_MAGIC 0x67446698 62 /* Do *not* use magics: 0x12560953 0x96744668. */ 63 64 /* 65 * This is the packet used for communication between client and 66 * server. All data are in network byte order. 67 */ 68 struct nbd_request { 69 __be32 magic; 70 __be32 type; /* == READ || == WRITE */ 71 char handle[8]; 72 __be64 from; 73 __be32 len; 74 } __attribute__((packed)); 75 76 /* 77 * This is the reply packet that nbd-server sends back to the client after 78 * it has completed an I/O request (or an error occurs). 79 */ 80 struct nbd_reply { 81 __be32 magic; 82 __be32 error; /* 0 = ok, else error */ 83 char handle[8]; /* handle you got from request */ 84 }; 85 #endif /* _UAPILINUX_NBD_H */ 86