2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
4 * Network Block Device Common Code
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.
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.
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/>.
19 #include "qemu/osdep.h"
21 #include "nbd-internal.h"
23 /* Discard length bytes from channel. Return -errno on failure and 0 on
25 int nbd_drop(QIOChannel *ioc, size_t size, Error **errp)
31 buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size));
33 ssize_t count = MIN(65536, size);
34 ret = nbd_read(ioc, buffer, MIN(65536, size), NULL, errp);
43 if (buffer != small) {
50 void nbd_tls_handshake(QIOTask *task,
53 struct NBDTLSHandshakeData *data = opaque;
55 qio_task_propagate_error(task, &data->error);
56 data->complete = true;
57 g_main_loop_quit(data->loop);
61 const char *nbd_opt_lookup(uint32_t opt)
64 case NBD_OPT_EXPORT_NAME:
70 case NBD_OPT_STARTTLS:
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 case NBD_OPT_EXTENDED_HEADERS:
83 return "extended headers";
90 const char *nbd_rep_lookup(uint32_t rep)
99 case NBD_REP_META_CONTEXT:
100 return "meta context";
101 case NBD_REP_ERR_UNSUP:
102 return "unsupported";
103 case NBD_REP_ERR_POLICY:
104 return "denied by policy";
105 case NBD_REP_ERR_INVALID:
107 case NBD_REP_ERR_PLATFORM:
108 return "platform lacks support";
109 case NBD_REP_ERR_TLS_REQD:
110 return "TLS required";
111 case NBD_REP_ERR_UNKNOWN:
112 return "export unknown";
113 case NBD_REP_ERR_SHUTDOWN:
114 return "server shutting down";
115 case NBD_REP_ERR_BLOCK_SIZE_REQD:
116 return "block size required";
117 case NBD_REP_ERR_TOO_BIG:
118 return "option payload too big";
119 case NBD_REP_ERR_EXT_HEADER_REQD:
120 return "extended headers required";
127 const char *nbd_info_lookup(uint16_t info)
130 case NBD_INFO_EXPORT:
134 case NBD_INFO_DESCRIPTION:
135 return "description";
136 case NBD_INFO_BLOCK_SIZE:
144 const char *nbd_cmd_lookup(uint16_t cmd)
159 case NBD_CMD_WRITE_ZEROES:
160 return "write zeroes";
161 case NBD_CMD_BLOCK_STATUS:
162 return "block status";
169 const char *nbd_reply_type_lookup(uint16_t type)
172 case NBD_REPLY_TYPE_NONE:
174 case NBD_REPLY_TYPE_OFFSET_DATA:
176 case NBD_REPLY_TYPE_OFFSET_HOLE:
178 case NBD_REPLY_TYPE_BLOCK_STATUS:
179 return "block status (32-bit)";
180 case NBD_REPLY_TYPE_BLOCK_STATUS_EXT:
181 return "block status (64-bit)";
182 case NBD_REPLY_TYPE_ERROR:
183 return "generic error";
184 case NBD_REPLY_TYPE_ERROR_OFFSET:
185 return "error at offset";
187 if (type & (1 << 15)) {
188 return "<unknown error>";
195 const char *nbd_err_lookup(int err)
222 int nbd_errno_to_system_errno(int err)
251 trace_nbd_unknown_error(err);
261 const char *nbd_mode_lookup(NBDMode mode)
264 case NBD_MODE_OLDSTYLE:
266 case NBD_MODE_EXPORT_NAME:
267 return "export name only";
268 case NBD_MODE_SIMPLE:
269 return "simple headers";
270 case NBD_MODE_STRUCTURED:
271 return "structured replies";
272 case NBD_MODE_EXTENDED:
273 return "extended headers";