nbd/common.c

   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), 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     default:
  79         return "<unknown>";
  80     }
  81 }
  82
  83
  84 const char *nbd_rep_lookup(uint32_t rep)
  85 {
  86     switch (rep) {
  87     case NBD_REP_ACK:
  88         return "ack";
  89     case NBD_REP_SERVER:
  90         return "server";
  91     case NBD_REP_INFO:
  92         return "info";
  93     case NBD_REP_ERR_UNSUP:
  94         return "unsupported";
  95     case NBD_REP_ERR_POLICY:
  96         return "denied by policy";
  97     case NBD_REP_ERR_INVALID:
  98         return "invalid";
  99     case NBD_REP_ERR_PLATFORM:
 100         return "platform lacks support";
 101     case NBD_REP_ERR_TLS_REQD:
 102         return "TLS required";
 103     case NBD_REP_ERR_UNKNOWN:
 104         return "export unknown";
 105     case NBD_REP_ERR_SHUTDOWN:
 106         return "server shutting down";
 107     case NBD_REP_ERR_BLOCK_SIZE_REQD:
 108         return "block size required";
 109     default:
 110         return "<unknown>";
 111     }
 112 }
 113
 114
 115 const char *nbd_info_lookup(uint16_t info)
 116 {
 117     switch (info) {
 118     case NBD_INFO_EXPORT:
 119         return "export";
 120     case NBD_INFO_NAME:
 121         return "name";
 122     case NBD_INFO_DESCRIPTION:
 123         return "description";
 124     case NBD_INFO_BLOCK_SIZE:
 125         return "block size";
 126     default:
 127         return "<unknown>";
 128     }
 129 }
 130
 131
 132 const char *nbd_cmd_lookup(uint16_t cmd)
 133 {
 134     switch (cmd) {
 135     case NBD_CMD_READ:
 136         return "read";
 137     case NBD_CMD_WRITE:
 138         return "write";
 139     case NBD_CMD_DISC:
 140         return "disconnect";
 141     case NBD_CMD_FLUSH:
 142         return "flush";
 143     case NBD_CMD_TRIM:
 144         return "trim";
 145     case NBD_CMD_WRITE_ZEROES:
 146         return "write zeroes";
 147     default:
 148         return "<unknown>";
 149     }
 150 }
 151
 152
 153 const char *nbd_reply_type_lookup(uint16_t type)
 154 {
 155     switch (type) {
 156     case NBD_REPLY_TYPE_NONE:
 157         return "none";
 158     case NBD_REPLY_TYPE_OFFSET_DATA:
 159         return "data";
 160     case NBD_REPLY_TYPE_OFFSET_HOLE:
 161         return "hole";
 162     case NBD_REPLY_TYPE_ERROR:
 163         return "generic error";
 164     case NBD_REPLY_TYPE_ERROR_OFFSET:
 165         return "error at offset";
 166     default:
 167         if (type & (1 << 15)) {
 168             return "<unknown error>";
 169         }
 170         return "<unknown>";
 171     }
 172 }
 173
 174
 175 const char *nbd_err_lookup(int err)
 176 {
 177     switch (err) {
 178     case NBD_SUCCESS:
 179         return "success";
 180     case NBD_EPERM:
 181         return "EPERM";
 182     case NBD_EIO:
 183         return "EIO";
 184     case NBD_ENOMEM:
 185         return "ENOMEM";
 186     case NBD_EINVAL:
 187         return "EINVAL";
 188     case NBD_ENOSPC:
 189         return "ENOSPC";
 190     case NBD_EOVERFLOW:
 191         return "EOVERFLOW";
 192     case NBD_ESHUTDOWN:
 193         return "ESHUTDOWN";
 194     default:
 195         return "<unknown>";
 196     }
 197 }
 198
 199
 200 int nbd_errno_to_system_errno(int err)
 201 {
 202     int ret;
 203     switch (err) {
 204     case NBD_SUCCESS:
 205         ret = 0;
 206         break;
 207     case NBD_EPERM:
 208         ret = EPERM;
 209         break;
 210     case NBD_EIO:
 211         ret = EIO;
 212         break;
 213     case NBD_ENOMEM:
 214         ret = ENOMEM;
 215         break;
 216     case NBD_ENOSPC:
 217         ret = ENOSPC;
 218         break;
 219     case NBD_EOVERFLOW:
 220         ret = EOVERFLOW;
 221         break;
 222     case NBD_ESHUTDOWN:
 223         ret = ESHUTDOWN;
 224         break;
 225     default:
 226         trace_nbd_unknown_error(err);
 227         /* fallthrough */
 228     case NBD_EINVAL:
 229         ret = EINVAL;
 230         break;
 231     }
 232     return ret;
 233 }