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 "qapi/error.h"
  21 #include "trace.h"
  22 #include "nbd-internal.h"
  23
  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
  50
  51 void nbd_tls_handshake(QIOTask *task,
  52                        void *opaque)
  53 {
  54     struct NBDTLSHandshakeData *data = opaque;
  55
  56     qio_task_propagate_error(task, &data->error);
  57     data->complete = true;
  58     g_main_loop_quit(data->loop);
  59 }
  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:
 141         return "disconnect";
 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 }
 152
 153
 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
 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";
 191     case NBD_EOVERFLOW:
 192         return "EOVERFLOW";
 193     case NBD_ESHUTDOWN:
 194         return "ESHUTDOWN";
 195     default:
 196         return "<unknown>";
 197     }
 198 }
 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;
 220     case NBD_EOVERFLOW:
 221         ret = EOVERFLOW;
 222         break;
 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 }