1 /* 2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> 3 * 4 * Network Block Device Common Code 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; under version 2 of the License. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "qemu/osdep.h" 20 #include "trace.h" 21 #include "nbd-internal.h" 22 23 /* Discard length bytes from channel. Return -errno on failure and 0 on 24 * success */ 25 int nbd_drop(QIOChannel *ioc, size_t size, Error **errp) 26 { 27 ssize_t ret = 0; 28 char small[1024]; 29 char *buffer; 30 31 buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size)); 32 while (size > 0) { 33 ssize_t count = MIN(65536, size); 34 ret = nbd_read(ioc, buffer, MIN(65536, size), NULL, errp); 35 36 if (ret < 0) { 37 goto cleanup; 38 } 39 size -= count; 40 } 41 42 cleanup: 43 if (buffer != small) { 44 g_free(buffer); 45 } 46 return ret; 47 } 48 49 50 void nbd_tls_handshake(QIOTask *task, 51 void *opaque) 52 { 53 struct NBDTLSHandshakeData *data = opaque; 54 55 qio_task_propagate_error(task, &data->error); 56 data->complete = true; 57 g_main_loop_quit(data->loop); 58 } 59 60 61 const char *nbd_opt_lookup(uint32_t opt) 62 { 63 switch (opt) { 64 case NBD_OPT_EXPORT_NAME: 65 return "export name"; 66 case NBD_OPT_ABORT: 67 return "abort"; 68 case NBD_OPT_LIST: 69 return "list"; 70 case NBD_OPT_STARTTLS: 71 return "starttls"; 72 case NBD_OPT_INFO: 73 return "info"; 74 case NBD_OPT_GO: 75 return "go"; 76 case NBD_OPT_STRUCTURED_REPLY: 77 return "structured reply"; 78 case NBD_OPT_LIST_META_CONTEXT: 79 return "list meta context"; 80 case NBD_OPT_SET_META_CONTEXT: 81 return "set meta context"; 82 default: 83 return "<unknown>"; 84 } 85 } 86 87 88 const char *nbd_rep_lookup(uint32_t rep) 89 { 90 switch (rep) { 91 case NBD_REP_ACK: 92 return "ack"; 93 case NBD_REP_SERVER: 94 return "server"; 95 case NBD_REP_INFO: 96 return "info"; 97 case NBD_REP_META_CONTEXT: 98 return "meta context"; 99 case NBD_REP_ERR_UNSUP: 100 return "unsupported"; 101 case NBD_REP_ERR_POLICY: 102 return "denied by policy"; 103 case NBD_REP_ERR_INVALID: 104 return "invalid"; 105 case NBD_REP_ERR_PLATFORM: 106 return "platform lacks support"; 107 case NBD_REP_ERR_TLS_REQD: 108 return "TLS required"; 109 case NBD_REP_ERR_UNKNOWN: 110 return "export unknown"; 111 case NBD_REP_ERR_SHUTDOWN: 112 return "server shutting down"; 113 case NBD_REP_ERR_BLOCK_SIZE_REQD: 114 return "block size required"; 115 default: 116 return "<unknown>"; 117 } 118 } 119 120 121 const char *nbd_info_lookup(uint16_t info) 122 { 123 switch (info) { 124 case NBD_INFO_EXPORT: 125 return "export"; 126 case NBD_INFO_NAME: 127 return "name"; 128 case NBD_INFO_DESCRIPTION: 129 return "description"; 130 case NBD_INFO_BLOCK_SIZE: 131 return "block size"; 132 default: 133 return "<unknown>"; 134 } 135 } 136 137 138 const char *nbd_cmd_lookup(uint16_t cmd) 139 { 140 switch (cmd) { 141 case NBD_CMD_READ: 142 return "read"; 143 case NBD_CMD_WRITE: 144 return "write"; 145 case NBD_CMD_DISC: 146 return "disconnect"; 147 case NBD_CMD_FLUSH: 148 return "flush"; 149 case NBD_CMD_TRIM: 150 return "trim"; 151 case NBD_CMD_CACHE: 152 return "cache"; 153 case NBD_CMD_WRITE_ZEROES: 154 return "write zeroes"; 155 case NBD_CMD_BLOCK_STATUS: 156 return "block status"; 157 default: 158 return "<unknown>"; 159 } 160 } 161 162 163 const char *nbd_reply_type_lookup(uint16_t type) 164 { 165 switch (type) { 166 case NBD_REPLY_TYPE_NONE: 167 return "none"; 168 case NBD_REPLY_TYPE_OFFSET_DATA: 169 return "data"; 170 case NBD_REPLY_TYPE_OFFSET_HOLE: 171 return "hole"; 172 case NBD_REPLY_TYPE_BLOCK_STATUS: 173 return "block status"; 174 case NBD_REPLY_TYPE_ERROR: 175 return "generic error"; 176 case NBD_REPLY_TYPE_ERROR_OFFSET: 177 return "error at offset"; 178 default: 179 if (type & (1 << 15)) { 180 return "<unknown error>"; 181 } 182 return "<unknown>"; 183 } 184 } 185 186 187 const char *nbd_err_lookup(int err) 188 { 189 switch (err) { 190 case NBD_SUCCESS: 191 return "success"; 192 case NBD_EPERM: 193 return "EPERM"; 194 case NBD_EIO: 195 return "EIO"; 196 case NBD_ENOMEM: 197 return "ENOMEM"; 198 case NBD_EINVAL: 199 return "EINVAL"; 200 case NBD_ENOSPC: 201 return "ENOSPC"; 202 case NBD_EOVERFLOW: 203 return "EOVERFLOW"; 204 case NBD_ENOTSUP: 205 return "ENOTSUP"; 206 case NBD_ESHUTDOWN: 207 return "ESHUTDOWN"; 208 default: 209 return "<unknown>"; 210 } 211 } 212 213 214 int nbd_errno_to_system_errno(int err) 215 { 216 int ret; 217 switch (err) { 218 case NBD_SUCCESS: 219 ret = 0; 220 break; 221 case NBD_EPERM: 222 ret = EPERM; 223 break; 224 case NBD_EIO: 225 ret = EIO; 226 break; 227 case NBD_ENOMEM: 228 ret = ENOMEM; 229 break; 230 case NBD_ENOSPC: 231 ret = ENOSPC; 232 break; 233 case NBD_EOVERFLOW: 234 ret = EOVERFLOW; 235 break; 236 case NBD_ENOTSUP: 237 ret = ENOTSUP; 238 break; 239 case NBD_ESHUTDOWN: 240 ret = ESHUTDOWN; 241 break; 242 default: 243 trace_nbd_unknown_error(err); 244 /* fallthrough */ 245 case NBD_EINVAL: 246 ret = EINVAL; 247 break; 248 } 249 return ret; 250 } 251 252 253 const char *nbd_mode_lookup(NBDMode mode) 254 { 255 switch (mode) { 256 case NBD_MODE_OLDSTYLE: 257 return "oldstyle"; 258 case NBD_MODE_EXPORT_NAME: 259 return "export name only"; 260 case NBD_MODE_SIMPLE: 261 return "simple headers"; 262 case NBD_MODE_STRUCTURED: 263 return "structured replies"; 264 default: 265 return "<unknown>"; 266 } 267 } 268