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/*
* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
*
* Network Block Device Common Code
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; under version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "trace.h"
#include "nbd-internal.h"
/* Discard length bytes from channel. Return -errno on failure and 0 on
* success */
int nbd_drop(QIOChannel *ioc, size_t size, Error **errp)
{
ssize_t ret = 0;
char small[1024];
char *buffer;
buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size));
while (size > 0) {
ssize_t count = MIN(65536, size);
ret = nbd_read(ioc, buffer, MIN(65536, size), NULL, errp);
if (ret < 0) {
goto cleanup;
}
size -= count;
}
cleanup:
if (buffer != small) {
g_free(buffer);
}
return ret;
}
void nbd_tls_handshake(QIOTask *task,
void *opaque)
{
struct NBDTLSHandshakeData *data = opaque;
qio_task_propagate_error(task, &data->error);
data->complete = true;
g_main_loop_quit(data->loop);
}
const char *nbd_opt_lookup(uint32_t opt)
{
switch (opt) {
case NBD_OPT_EXPORT_NAME:
return "export name";
case NBD_OPT_ABORT:
return "abort";
case NBD_OPT_LIST:
return "list";
case NBD_OPT_STARTTLS:
return "starttls";
case NBD_OPT_INFO:
return "info";
case NBD_OPT_GO:
return "go";
case NBD_OPT_STRUCTURED_REPLY:
return "structured reply";
case NBD_OPT_LIST_META_CONTEXT:
return "list meta context";
case NBD_OPT_SET_META_CONTEXT:
return "set meta context";
default:
return "<unknown>";
}
}
const char *nbd_rep_lookup(uint32_t rep)
{
switch (rep) {
case NBD_REP_ACK:
return "ack";
case NBD_REP_SERVER:
return "server";
case NBD_REP_INFO:
return "info";
case NBD_REP_META_CONTEXT:
return "meta context";
case NBD_REP_ERR_UNSUP:
return "unsupported";
case NBD_REP_ERR_POLICY:
return "denied by policy";
case NBD_REP_ERR_INVALID:
return "invalid";
case NBD_REP_ERR_PLATFORM:
return "platform lacks support";
case NBD_REP_ERR_TLS_REQD:
return "TLS required";
case NBD_REP_ERR_UNKNOWN:
return "export unknown";
case NBD_REP_ERR_SHUTDOWN:
return "server shutting down";
case NBD_REP_ERR_BLOCK_SIZE_REQD:
return "block size required";
default:
return "<unknown>";
}
}
const char *nbd_info_lookup(uint16_t info)
{
switch (info) {
case NBD_INFO_EXPORT:
return "export";
case NBD_INFO_NAME:
return "name";
case NBD_INFO_DESCRIPTION:
return "description";
case NBD_INFO_BLOCK_SIZE:
return "block size";
default:
return "<unknown>";
}
}
const char *nbd_cmd_lookup(uint16_t cmd)
{
switch (cmd) {
case NBD_CMD_READ:
return "read";
case NBD_CMD_WRITE:
return "write";
case NBD_CMD_DISC:
return "disconnect";
case NBD_CMD_FLUSH:
return "flush";
case NBD_CMD_TRIM:
return "trim";
case NBD_CMD_CACHE:
return "cache";
case NBD_CMD_WRITE_ZEROES:
return "write zeroes";
case NBD_CMD_BLOCK_STATUS:
return "block status";
default:
return "<unknown>";
}
}
const char *nbd_reply_type_lookup(uint16_t type)
{
switch (type) {
case NBD_REPLY_TYPE_NONE:
return "none";
case NBD_REPLY_TYPE_OFFSET_DATA:
return "data";
case NBD_REPLY_TYPE_OFFSET_HOLE:
return "hole";
case NBD_REPLY_TYPE_BLOCK_STATUS:
return "block status";
case NBD_REPLY_TYPE_ERROR:
return "generic error";
case NBD_REPLY_TYPE_ERROR_OFFSET:
return "error at offset";
default:
if (type & (1 << 15)) {
return "<unknown error>";
}
return "<unknown>";
}
}
const char *nbd_err_lookup(int err)
{
switch (err) {
case NBD_SUCCESS:
return "success";
case NBD_EPERM:
return "EPERM";
case NBD_EIO:
return "EIO";
case NBD_ENOMEM:
return "ENOMEM";
case NBD_EINVAL:
return "EINVAL";
case NBD_ENOSPC:
return "ENOSPC";
case NBD_EOVERFLOW:
return "EOVERFLOW";
case NBD_ESHUTDOWN:
return "ESHUTDOWN";
default:
return "<unknown>";
}
}
int nbd_errno_to_system_errno(int err)
{
int ret;
switch (err) {
case NBD_SUCCESS:
ret = 0;
break;
case NBD_EPERM:
ret = EPERM;
break;
case NBD_EIO:
ret = EIO;
break;
case NBD_ENOMEM:
ret = ENOMEM;
break;
case NBD_ENOSPC:
ret = ENOSPC;
break;
case NBD_EOVERFLOW:
ret = EOVERFLOW;
break;
case NBD_ESHUTDOWN:
ret = ESHUTDOWN;
break;
default:
trace_nbd_unknown_error(err);
/* fallthrough */
case NBD_EINVAL:
ret = EINVAL;
break;
}
return ret;
}
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