The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * QEMU Block driver for NBD |
| 3 | * |
| 4 | * Copyright (C) 2008 Bull S.A.S. |
| 5 | * Author: Laurent Vivier <Laurent.Vivier@bull.net> |
| 6 | * |
| 7 | * Some parts: |
| 8 | * Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws> |
| 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to deal |
| 12 | * in the Software without restriction, including without limitation the rights |
| 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | * copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | * |
| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 26 | * THE SOFTWARE. |
| 27 | */ |
| 28 | |
| 29 | #include "qemu-common.h" |
| 30 | #include "nbd.h" |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 31 | #include "module.h" |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 32 | |
| 33 | #include <sys/types.h> |
| 34 | #include <unistd.h> |
| 35 | |
| 36 | typedef struct BDRVNBDState { |
| 37 | int sock; |
| 38 | off_t size; |
| 39 | size_t blocksize; |
| 40 | } BDRVNBDState; |
| 41 | |
| 42 | static int nbd_open(BlockDriverState *bs, const char* filename, int flags) |
| 43 | { |
| 44 | BDRVNBDState *s = bs->opaque; |
| 45 | const char *host; |
| 46 | const char *unixpath; |
| 47 | int sock; |
| 48 | off_t size; |
| 49 | size_t blocksize; |
| 50 | int ret; |
| 51 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 52 | if (!strstart(filename, "nbd:", &host)) |
| 53 | return -EINVAL; |
| 54 | |
| 55 | if (strstart(host, "unix:", &unixpath)) { |
| 56 | |
| 57 | if (unixpath[0] != '/') |
| 58 | return -EINVAL; |
| 59 | |
| 60 | sock = unix_socket_outgoing(unixpath); |
| 61 | |
| 62 | } else { |
| 63 | uint16_t port; |
| 64 | char *p, *r; |
| 65 | char hostname[128]; |
| 66 | |
| 67 | pstrcpy(hostname, 128, host); |
| 68 | |
| 69 | p = strchr(hostname, ':'); |
| 70 | if (p == NULL) |
| 71 | return -EINVAL; |
| 72 | |
| 73 | *p = '\0'; |
| 74 | p++; |
| 75 | |
| 76 | port = strtol(p, &r, 0); |
| 77 | if (r == p) |
| 78 | return -EINVAL; |
| 79 | sock = tcp_socket_outgoing(hostname, port); |
| 80 | } |
| 81 | |
| 82 | if (sock == -1) |
| 83 | return -errno; |
| 84 | |
| 85 | ret = nbd_receive_negotiate(sock, &size, &blocksize); |
| 86 | if (ret == -1) |
| 87 | return -errno; |
| 88 | |
| 89 | s->sock = sock; |
| 90 | s->size = size; |
| 91 | s->blocksize = blocksize; |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | static int nbd_read(BlockDriverState *bs, int64_t sector_num, |
| 97 | uint8_t *buf, int nb_sectors) |
| 98 | { |
| 99 | BDRVNBDState *s = bs->opaque; |
| 100 | struct nbd_request request; |
| 101 | struct nbd_reply reply; |
| 102 | |
| 103 | request.type = NBD_CMD_READ; |
| 104 | request.handle = (uint64_t)(intptr_t)bs; |
| 105 | request.from = sector_num * 512;; |
| 106 | request.len = nb_sectors * 512; |
| 107 | |
| 108 | if (nbd_send_request(s->sock, &request) == -1) |
| 109 | return -errno; |
| 110 | |
| 111 | if (nbd_receive_reply(s->sock, &reply) == -1) |
| 112 | return -errno; |
| 113 | |
| 114 | if (reply.error !=0) |
| 115 | return -reply.error; |
| 116 | |
| 117 | if (reply.handle != request.handle) |
| 118 | return -EIO; |
| 119 | |
| 120 | if (nbd_wr_sync(s->sock, buf, request.len, 1) != request.len) |
| 121 | return -EIO; |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | static int nbd_write(BlockDriverState *bs, int64_t sector_num, |
| 127 | const uint8_t *buf, int nb_sectors) |
| 128 | { |
| 129 | BDRVNBDState *s = bs->opaque; |
| 130 | struct nbd_request request; |
| 131 | struct nbd_reply reply; |
| 132 | |
| 133 | request.type = NBD_CMD_WRITE; |
| 134 | request.handle = (uint64_t)(intptr_t)bs; |
| 135 | request.from = sector_num * 512;; |
| 136 | request.len = nb_sectors * 512; |
| 137 | |
| 138 | if (nbd_send_request(s->sock, &request) == -1) |
| 139 | return -errno; |
| 140 | |
| 141 | if (nbd_wr_sync(s->sock, (uint8_t*)buf, request.len, 0) != request.len) |
| 142 | return -EIO; |
| 143 | |
| 144 | if (nbd_receive_reply(s->sock, &reply) == -1) |
| 145 | return -errno; |
| 146 | |
| 147 | if (reply.error !=0) |
| 148 | return -reply.error; |
| 149 | |
| 150 | if (reply.handle != request.handle) |
| 151 | return -EIO; |
| 152 | |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | static void nbd_close(BlockDriverState *bs) |
| 157 | { |
| 158 | BDRVNBDState *s = bs->opaque; |
| 159 | struct nbd_request request; |
| 160 | |
| 161 | request.type = NBD_CMD_DISC; |
| 162 | request.handle = (uint64_t)(intptr_t)bs; |
| 163 | request.from = 0; |
| 164 | request.len = 0; |
| 165 | nbd_send_request(s->sock, &request); |
| 166 | |
| 167 | close(s->sock); |
| 168 | } |
| 169 | |
| 170 | static int64_t nbd_getlength(BlockDriverState *bs) |
| 171 | { |
| 172 | BDRVNBDState *s = bs->opaque; |
| 173 | |
| 174 | return s->size; |
| 175 | } |
| 176 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 177 | static BlockDriver bdrv_nbd = { |
| 178 | .format_name = "nbd", |
| 179 | .instance_size = sizeof(BDRVNBDState), |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 180 | .bdrv_file_open = nbd_open, |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 181 | .bdrv_read = nbd_read, |
| 182 | .bdrv_write = nbd_write, |
| 183 | .bdrv_close = nbd_close, |
| 184 | .bdrv_getlength = nbd_getlength, |
| 185 | .protocol_name = "nbd", |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 186 | }; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 187 | |
| 188 | static void bdrv_nbd_init(void) |
| 189 | { |
| 190 | bdrv_register(&bdrv_nbd); |
| 191 | } |
| 192 | |
| 193 | block_init(bdrv_nbd_init); |