src/add-ons/kernel/drivers/disk/virtual/nbd/nbd.h

   1 /*
   2  * Network Block Device protocol
   3  * Copyright 2006-2007, François Revol. All rights reserved.
   4  * Distributed under the terms of the MIT License.
   5  *
   6  * references:
   7  * include/linux/nbd.h
   8  */
   9
  10 enum {
  11         NBD_CMD_READ = 0,
  12         NBD_CMD_WRITE,
  13         NBD_CMD_DISC
  14 };
  15
  16 #define NBD_REQUEST_MAGIC 0x25609513
  17 #define NBD_REPLY_MAGIC 0x67446698
  18
  19 /* in network byte order */
  20 struct nbd_request {
  21         uint32 magic; /* REQUEST_MAGIC */
  22         uint32 type;
  23         uint64 handle; //char handle[8];
  24         uint64 from;
  25         uint32 len;
  26 } _PACKED;
  27
  28 /* in network byte order */
  29 struct nbd_reply {
  30         uint32 magic; /* REPLY_MAGIC */
  31         uint32 error;
  32         uint64 handle; //char handle[8];
  33 } _PACKED;
  34
  35 /* initialization protocol (ENBD ? or at least Linux specific ?) */
  36
  37 #define NBD_INIT_PASSWD "NBDMAGIC"
  38 #define NBD_INIT_MAGIC 0x0000420281861253LL
  39
  40 /* in network byte order */
  41 struct nbd_init_packet {
  42         uint8 passwd[8]; /* "NBDMAGIC" */
  43         uint64 magic; /* INIT_MAGIC */
  44         uint64 device_size; /* size in bytes */
  45         uint8 dummy[128]; /* reserved for future use */
  46 } _PACKED;