Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 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 | |
Peter Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 19 | #include "qemu/osdep.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 20 | #include "qapi/error.h" |
Eric Blake | dd68944 | 2017-10-27 12:40:27 +0200 | [diff] [blame] | 21 | #include "trace.h" |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 22 | #include "nbd-internal.h" |
| 23 | |
Vladimir Sementsov-Ogievskiy | 4429802 | 2017-06-02 18:01:40 +0300 | [diff] [blame] | 24 | /* Discard length bytes from channel. Return -errno on failure and 0 on |
| 25 | * success */ |
| 26 | int nbd_drop(QIOChannel *ioc, size_t size, Error **errp) |
| 27 | { |
| 28 | ssize_t ret = 0; |
| 29 | char small[1024]; |
| 30 | char *buffer; |
| 31 | |
| 32 | buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size)); |
| 33 | while (size > 0) { |
| 34 | ssize_t count = MIN(65536, size); |
| 35 | ret = nbd_read(ioc, buffer, MIN(65536, size), errp); |
| 36 | |
| 37 | if (ret < 0) { |
| 38 | goto cleanup; |
| 39 | } |
| 40 | size -= count; |
| 41 | } |
| 42 | |
| 43 | cleanup: |
| 44 | if (buffer != small) { |
| 45 | g_free(buffer); |
| 46 | } |
| 47 | return ret; |
| 48 | } |
| 49 | |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 50 | |
Daniel P. Berrange | 60e705c | 2016-08-11 15:20:58 +0100 | [diff] [blame] | 51 | void nbd_tls_handshake(QIOTask *task, |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 52 | void *opaque) |
| 53 | { |
| 54 | struct NBDTLSHandshakeData *data = opaque; |
| 55 | |
Vladimir Sementsov-Ogievskiy | 3e6bb54 | 2017-07-07 18:29:13 +0300 | [diff] [blame] | 56 | qio_task_propagate_error(task, &data->error); |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 57 | data->complete = true; |
| 58 | g_main_loop_quit(data->loop); |
| 59 | } |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 60 | |
| 61 | |
| 62 | const char *nbd_opt_lookup(uint32_t opt) |
| 63 | { |
| 64 | switch (opt) { |
| 65 | case NBD_OPT_EXPORT_NAME: |
| 66 | return "export name"; |
| 67 | case NBD_OPT_ABORT: |
| 68 | return "abort"; |
| 69 | case NBD_OPT_LIST: |
| 70 | return "list"; |
| 71 | case NBD_OPT_STARTTLS: |
| 72 | return "starttls"; |
| 73 | case NBD_OPT_INFO: |
| 74 | return "info"; |
| 75 | case NBD_OPT_GO: |
| 76 | return "go"; |
| 77 | case NBD_OPT_STRUCTURED_REPLY: |
| 78 | return "structured reply"; |
| 79 | default: |
| 80 | return "<unknown>"; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | |
| 85 | const char *nbd_rep_lookup(uint32_t rep) |
| 86 | { |
| 87 | switch (rep) { |
| 88 | case NBD_REP_ACK: |
| 89 | return "ack"; |
| 90 | case NBD_REP_SERVER: |
| 91 | return "server"; |
| 92 | case NBD_REP_INFO: |
| 93 | return "info"; |
| 94 | case NBD_REP_ERR_UNSUP: |
| 95 | return "unsupported"; |
| 96 | case NBD_REP_ERR_POLICY: |
| 97 | return "denied by policy"; |
| 98 | case NBD_REP_ERR_INVALID: |
| 99 | return "invalid"; |
| 100 | case NBD_REP_ERR_PLATFORM: |
| 101 | return "platform lacks support"; |
| 102 | case NBD_REP_ERR_TLS_REQD: |
| 103 | return "TLS required"; |
| 104 | case NBD_REP_ERR_UNKNOWN: |
| 105 | return "export unknown"; |
| 106 | case NBD_REP_ERR_SHUTDOWN: |
| 107 | return "server shutting down"; |
| 108 | case NBD_REP_ERR_BLOCK_SIZE_REQD: |
| 109 | return "block size required"; |
| 110 | default: |
| 111 | return "<unknown>"; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | |
| 116 | const char *nbd_info_lookup(uint16_t info) |
| 117 | { |
| 118 | switch (info) { |
| 119 | case NBD_INFO_EXPORT: |
| 120 | return "export"; |
| 121 | case NBD_INFO_NAME: |
| 122 | return "name"; |
| 123 | case NBD_INFO_DESCRIPTION: |
| 124 | return "description"; |
| 125 | case NBD_INFO_BLOCK_SIZE: |
| 126 | return "block size"; |
| 127 | default: |
| 128 | return "<unknown>"; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | |
| 133 | const char *nbd_cmd_lookup(uint16_t cmd) |
| 134 | { |
| 135 | switch (cmd) { |
| 136 | case NBD_CMD_READ: |
| 137 | return "read"; |
| 138 | case NBD_CMD_WRITE: |
| 139 | return "write"; |
| 140 | case NBD_CMD_DISC: |
Eric Blake | dad3946 | 2017-08-10 20:57:48 -0500 | [diff] [blame] | 141 | return "disconnect"; |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 142 | case NBD_CMD_FLUSH: |
| 143 | return "flush"; |
| 144 | case NBD_CMD_TRIM: |
| 145 | return "trim"; |
| 146 | case NBD_CMD_WRITE_ZEROES: |
| 147 | return "write zeroes"; |
| 148 | default: |
| 149 | return "<unknown>"; |
| 150 | } |
| 151 | } |
Eric Blake | e7a78d0 | 2017-10-27 12:40:26 +0200 | [diff] [blame] | 152 | |
| 153 | |
Eric Blake | bae245d | 2017-10-27 12:40:28 +0200 | [diff] [blame] | 154 | const char *nbd_reply_type_lookup(uint16_t type) |
| 155 | { |
| 156 | switch (type) { |
| 157 | case NBD_REPLY_TYPE_NONE: |
| 158 | return "none"; |
| 159 | case NBD_REPLY_TYPE_OFFSET_DATA: |
| 160 | return "data"; |
| 161 | case NBD_REPLY_TYPE_OFFSET_HOLE: |
| 162 | return "hole"; |
| 163 | case NBD_REPLY_TYPE_ERROR: |
| 164 | return "generic error"; |
| 165 | case NBD_REPLY_TYPE_ERROR_OFFSET: |
| 166 | return "error at offset"; |
| 167 | default: |
| 168 | if (type & (1 << 15)) { |
| 169 | return "<unknown error>"; |
| 170 | } |
| 171 | return "<unknown>"; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | |
Eric Blake | e7a78d0 | 2017-10-27 12:40:26 +0200 | [diff] [blame] | 176 | const char *nbd_err_lookup(int err) |
| 177 | { |
| 178 | switch (err) { |
| 179 | case NBD_SUCCESS: |
| 180 | return "success"; |
| 181 | case NBD_EPERM: |
| 182 | return "EPERM"; |
| 183 | case NBD_EIO: |
| 184 | return "EIO"; |
| 185 | case NBD_ENOMEM: |
| 186 | return "ENOMEM"; |
| 187 | case NBD_EINVAL: |
| 188 | return "EINVAL"; |
| 189 | case NBD_ENOSPC: |
| 190 | return "ENOSPC"; |
Eric Blake | bae245d | 2017-10-27 12:40:28 +0200 | [diff] [blame] | 191 | case NBD_EOVERFLOW: |
| 192 | return "EOVERFLOW"; |
Eric Blake | e7a78d0 | 2017-10-27 12:40:26 +0200 | [diff] [blame] | 193 | case NBD_ESHUTDOWN: |
| 194 | return "ESHUTDOWN"; |
| 195 | default: |
| 196 | return "<unknown>"; |
| 197 | } |
| 198 | } |
Eric Blake | dd68944 | 2017-10-27 12:40:27 +0200 | [diff] [blame] | 199 | |
| 200 | |
| 201 | int nbd_errno_to_system_errno(int err) |
| 202 | { |
| 203 | int ret; |
| 204 | switch (err) { |
| 205 | case NBD_SUCCESS: |
| 206 | ret = 0; |
| 207 | break; |
| 208 | case NBD_EPERM: |
| 209 | ret = EPERM; |
| 210 | break; |
| 211 | case NBD_EIO: |
| 212 | ret = EIO; |
| 213 | break; |
| 214 | case NBD_ENOMEM: |
| 215 | ret = ENOMEM; |
| 216 | break; |
| 217 | case NBD_ENOSPC: |
| 218 | ret = ENOSPC; |
| 219 | break; |
Eric Blake | bae245d | 2017-10-27 12:40:28 +0200 | [diff] [blame] | 220 | case NBD_EOVERFLOW: |
| 221 | ret = EOVERFLOW; |
| 222 | break; |
Eric Blake | dd68944 | 2017-10-27 12:40:27 +0200 | [diff] [blame] | 223 | case NBD_ESHUTDOWN: |
| 224 | ret = ESHUTDOWN; |
| 225 | break; |
| 226 | default: |
| 227 | trace_nbd_unknown_error(err); |
| 228 | /* fallthrough */ |
| 229 | case NBD_EINVAL: |
| 230 | ret = EINVAL; |
| 231 | break; |
| 232 | } |
| 233 | return ret; |
| 234 | } |