2016-01-14 11:41:02 +03:00
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/*
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* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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*
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* Network Block Device Client Side
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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2016-01-29 20:50:05 +03:00
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#include "qemu/osdep.h"
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include/qemu/osdep.h: Don't include qapi/error.h
Commit 57cb38b included qapi/error.h into qemu/osdep.h to get the
Error typedef. Since then, we've moved to include qemu/osdep.h
everywhere. Its file comment explains: "To avoid getting into
possible circular include dependencies, this file should not include
any other QEMU headers, with the exceptions of config-host.h,
compiler.h, os-posix.h and os-win32.h, all of which are doing a
similar job to this file and are under similar constraints."
qapi/error.h doesn't do a similar job, and it doesn't adhere to
similar constraints: it includes qapi-types.h. That's in excess of
100KiB of crap most .c files don't actually need.
Add the typedef to qemu/typedefs.h, and include that instead of
qapi/error.h. Include qapi/error.h in .c files that need it and don't
get it now. Include qapi-types.h in qom/object.h for uint16List.
Update scripts/clean-includes accordingly. Update it further to match
reality: replace config.h by config-target.h, add sysemu/os-posix.h,
sysemu/os-win32.h. Update the list of includes in the qemu/osdep.h
comment quoted above similarly.
This reduces the number of objects depending on qapi/error.h from "all
of them" to less than a third. Unfortunately, the number depending on
qapi-types.h shrinks only a little. More work is needed for that one.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
[Fix compilation without the spice devel packages. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-14 11:01:28 +03:00
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#include "qapi/error.h"
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2016-01-14 11:41:02 +03:00
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#include "nbd-internal.h"
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static int nbd_errno_to_system_errno(int err)
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{
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switch (err) {
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case NBD_SUCCESS:
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return 0;
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case NBD_EPERM:
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return EPERM;
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case NBD_EIO:
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return EIO;
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case NBD_ENOMEM:
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return ENOMEM;
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case NBD_ENOSPC:
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return ENOSPC;
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case NBD_EINVAL:
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default:
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return EINVAL;
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}
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}
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/* Definitions for opaque data types */
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static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
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/* That's all folks */
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/* Basic flow for negotiation
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Server Client
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Negotiate
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or
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Server Client
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Negotiate #1
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Option
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Negotiate #2
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----
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followed by
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Server Client
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Request
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Response
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Request
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Response
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...
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...
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Request (type == 2)
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*/
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2016-02-10 21:41:09 +03:00
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static int nbd_handle_reply_err(uint32_t opt, uint32_t type, Error **errp)
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{
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if (!(type & (1 << 31))) {
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return 0;
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}
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switch (type) {
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case NBD_REP_ERR_UNSUP:
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error_setg(errp, "Unsupported option type %x", opt);
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break;
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2016-02-10 21:41:11 +03:00
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case NBD_REP_ERR_POLICY:
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error_setg(errp, "Denied by server for option %x", opt);
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break;
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2016-02-10 21:41:09 +03:00
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case NBD_REP_ERR_INVALID:
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error_setg(errp, "Invalid data length for option %x", opt);
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break;
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2016-02-10 21:41:11 +03:00
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case NBD_REP_ERR_TLS_REQD:
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error_setg(errp, "TLS negotiation required before option %x", opt);
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break;
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2016-02-10 21:41:09 +03:00
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default:
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error_setg(errp, "Unknown error code when asking for option %x", opt);
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break;
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}
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return -1;
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}
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static int nbd_receive_list(QIOChannel *ioc, char **name, Error **errp)
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{
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uint64_t magic;
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uint32_t opt;
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uint32_t type;
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uint32_t len;
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uint32_t namelen;
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*name = NULL;
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if (read_sync(ioc, &magic, sizeof(magic)) != sizeof(magic)) {
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error_setg(errp, "failed to read list option magic");
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return -1;
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}
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magic = be64_to_cpu(magic);
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if (magic != NBD_REP_MAGIC) {
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error_setg(errp, "Unexpected option list magic");
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return -1;
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}
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if (read_sync(ioc, &opt, sizeof(opt)) != sizeof(opt)) {
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error_setg(errp, "failed to read list option");
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return -1;
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}
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opt = be32_to_cpu(opt);
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if (opt != NBD_OPT_LIST) {
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error_setg(errp, "Unexpected option type %x expected %x",
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opt, NBD_OPT_LIST);
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return -1;
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}
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if (read_sync(ioc, &type, sizeof(type)) != sizeof(type)) {
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error_setg(errp, "failed to read list option type");
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return -1;
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}
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type = be32_to_cpu(type);
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if (type == NBD_REP_ERR_UNSUP) {
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return 0;
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}
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if (nbd_handle_reply_err(opt, type, errp) < 0) {
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return -1;
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}
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if (read_sync(ioc, &len, sizeof(len)) != sizeof(len)) {
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error_setg(errp, "failed to read option length");
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return -1;
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}
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len = be32_to_cpu(len);
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if (type == NBD_REP_ACK) {
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if (len != 0) {
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error_setg(errp, "length too long for option end");
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return -1;
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}
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} else if (type == NBD_REP_SERVER) {
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if (read_sync(ioc, &namelen, sizeof(namelen)) != sizeof(namelen)) {
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error_setg(errp, "failed to read option name length");
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return -1;
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}
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namelen = be32_to_cpu(namelen);
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if (len != (namelen + sizeof(namelen))) {
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error_setg(errp, "incorrect option mame length");
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return -1;
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}
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if (namelen > 255) {
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error_setg(errp, "export name length too long %d", namelen);
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return -1;
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}
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*name = g_new0(char, namelen + 1);
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if (read_sync(ioc, *name, namelen) != namelen) {
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error_setg(errp, "failed to read export name");
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g_free(*name);
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*name = NULL;
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return -1;
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}
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(*name)[namelen] = '\0';
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} else {
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error_setg(errp, "Unexpected reply type %x expected %x",
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type, NBD_REP_SERVER);
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return -1;
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}
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return 1;
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}
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static int nbd_receive_query_exports(QIOChannel *ioc,
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const char *wantname,
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Error **errp)
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{
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uint64_t magic = cpu_to_be64(NBD_OPTS_MAGIC);
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uint32_t opt = cpu_to_be32(NBD_OPT_LIST);
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uint32_t length = 0;
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bool foundExport = false;
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TRACE("Querying export list");
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if (write_sync(ioc, &magic, sizeof(magic)) != sizeof(magic)) {
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error_setg(errp, "Failed to send list option magic");
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return -1;
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}
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if (write_sync(ioc, &opt, sizeof(opt)) != sizeof(opt)) {
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error_setg(errp, "Failed to send list option number");
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return -1;
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}
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if (write_sync(ioc, &length, sizeof(length)) != sizeof(length)) {
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error_setg(errp, "Failed to send list option length");
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return -1;
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}
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TRACE("Reading available export names");
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while (1) {
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char *name = NULL;
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int ret = nbd_receive_list(ioc, &name, errp);
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if (ret < 0) {
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g_free(name);
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name = NULL;
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return -1;
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}
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if (ret == 0) {
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/* Server doesn't support export listing, so
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* we will just assume an export with our
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* wanted name exists */
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foundExport = true;
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break;
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}
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if (name == NULL) {
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TRACE("End of export name list");
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break;
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}
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if (g_str_equal(name, wantname)) {
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foundExport = true;
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TRACE("Found desired export name '%s'", name);
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} else {
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TRACE("Ignored export name '%s'", name);
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}
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g_free(name);
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}
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if (!foundExport) {
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error_setg(errp, "No export with name '%s' available", wantname);
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return -1;
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}
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return 0;
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}
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2016-02-10 21:41:11 +03:00
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static QIOChannel *nbd_receive_starttls(QIOChannel *ioc,
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QCryptoTLSCreds *tlscreds,
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const char *hostname, Error **errp)
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{
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uint64_t magic = cpu_to_be64(NBD_OPTS_MAGIC);
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uint32_t opt = cpu_to_be32(NBD_OPT_STARTTLS);
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uint32_t length = 0;
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uint32_t type;
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QIOChannelTLS *tioc;
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struct NBDTLSHandshakeData data = { 0 };
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TRACE("Requesting TLS from server");
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if (write_sync(ioc, &magic, sizeof(magic)) != sizeof(magic)) {
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error_setg(errp, "Failed to send option magic");
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return NULL;
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}
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if (write_sync(ioc, &opt, sizeof(opt)) != sizeof(opt)) {
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error_setg(errp, "Failed to send option number");
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return NULL;
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}
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if (write_sync(ioc, &length, sizeof(length)) != sizeof(length)) {
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error_setg(errp, "Failed to send option length");
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return NULL;
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}
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TRACE("Getting TLS reply from server1");
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if (read_sync(ioc, &magic, sizeof(magic)) != sizeof(magic)) {
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error_setg(errp, "failed to read option magic");
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return NULL;
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}
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magic = be64_to_cpu(magic);
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if (magic != NBD_REP_MAGIC) {
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error_setg(errp, "Unexpected option magic");
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return NULL;
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}
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TRACE("Getting TLS reply from server2");
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if (read_sync(ioc, &opt, sizeof(opt)) != sizeof(opt)) {
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error_setg(errp, "failed to read option");
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return NULL;
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}
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opt = be32_to_cpu(opt);
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if (opt != NBD_OPT_STARTTLS) {
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error_setg(errp, "Unexpected option type %x expected %x",
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opt, NBD_OPT_STARTTLS);
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return NULL;
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}
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TRACE("Getting TLS reply from server");
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if (read_sync(ioc, &type, sizeof(type)) != sizeof(type)) {
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error_setg(errp, "failed to read option type");
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return NULL;
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}
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type = be32_to_cpu(type);
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if (type != NBD_REP_ACK) {
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error_setg(errp, "Server rejected request to start TLS %x",
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type);
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return NULL;
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}
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TRACE("Getting TLS reply from server");
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if (read_sync(ioc, &length, sizeof(length)) != sizeof(length)) {
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error_setg(errp, "failed to read option length");
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return NULL;
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}
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length = be32_to_cpu(length);
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if (length != 0) {
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error_setg(errp, "Start TLS reponse was not zero %x",
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length);
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return NULL;
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}
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TRACE("TLS request approved, setting up TLS");
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tioc = qio_channel_tls_new_client(ioc, tlscreds, hostname, errp);
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if (!tioc) {
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return NULL;
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}
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data.loop = g_main_loop_new(g_main_context_default(), FALSE);
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TRACE("Starting TLS hanshake");
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qio_channel_tls_handshake(tioc,
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nbd_tls_handshake,
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&data,
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NULL);
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if (!data.complete) {
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g_main_loop_run(data.loop);
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}
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g_main_loop_unref(data.loop);
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if (data.error) {
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error_propagate(errp, data.error);
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object_unref(OBJECT(tioc));
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return NULL;
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}
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return QIO_CHANNEL(tioc);
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}
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|
2016-02-10 21:41:04 +03:00
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|
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int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags,
|
2016-02-10 21:41:11 +03:00
|
|
|
QCryptoTLSCreds *tlscreds, const char *hostname,
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|
|
|
QIOChannel **outioc,
|
2016-01-14 11:41:02 +03:00
|
|
|
off_t *size, Error **errp)
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|
|
|
{
|
|
|
|
char buf[256];
|
|
|
|
uint64_t magic, s;
|
|
|
|
int rc;
|
|
|
|
|
2016-02-10 21:41:11 +03:00
|
|
|
TRACE("Receiving negotiation tlscreds=%p hostname=%s.",
|
|
|
|
tlscreds, hostname ? hostname : "<null>");
|
2016-01-14 11:41:02 +03:00
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
|
2016-02-10 21:41:11 +03:00
|
|
|
if (outioc) {
|
|
|
|
*outioc = NULL;
|
|
|
|
}
|
|
|
|
if (tlscreds && !outioc) {
|
|
|
|
error_setg(errp, "Output I/O channel required for TLS");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2016-02-10 21:41:04 +03:00
|
|
|
if (read_sync(ioc, buf, 8) != 8) {
|
2016-01-14 11:41:02 +03:00
|
|
|
error_setg(errp, "Failed to read data");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
buf[8] = '\0';
|
|
|
|
if (strlen(buf) == 0) {
|
|
|
|
error_setg(errp, "Server connection closed unexpectedly");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
TRACE("Magic is %c%c%c%c%c%c%c%c",
|
|
|
|
qemu_isprint(buf[0]) ? buf[0] : '.',
|
|
|
|
qemu_isprint(buf[1]) ? buf[1] : '.',
|
|
|
|
qemu_isprint(buf[2]) ? buf[2] : '.',
|
|
|
|
qemu_isprint(buf[3]) ? buf[3] : '.',
|
|
|
|
qemu_isprint(buf[4]) ? buf[4] : '.',
|
|
|
|
qemu_isprint(buf[5]) ? buf[5] : '.',
|
|
|
|
qemu_isprint(buf[6]) ? buf[6] : '.',
|
|
|
|
qemu_isprint(buf[7]) ? buf[7] : '.');
|
|
|
|
|
|
|
|
if (memcmp(buf, "NBDMAGIC", 8) != 0) {
|
|
|
|
error_setg(errp, "Invalid magic received");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2016-02-10 21:41:04 +03:00
|
|
|
if (read_sync(ioc, &magic, sizeof(magic)) != sizeof(magic)) {
|
2016-01-14 11:41:02 +03:00
|
|
|
error_setg(errp, "Failed to read magic");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
magic = be64_to_cpu(magic);
|
|
|
|
TRACE("Magic is 0x%" PRIx64, magic);
|
|
|
|
|
2016-02-10 21:41:05 +03:00
|
|
|
if (magic == NBD_OPTS_MAGIC) {
|
2016-02-10 21:41:07 +03:00
|
|
|
uint32_t clientflags = 0;
|
2016-01-14 11:41:02 +03:00
|
|
|
uint32_t opt;
|
|
|
|
uint32_t namesize;
|
2016-02-10 21:41:07 +03:00
|
|
|
uint16_t globalflags;
|
|
|
|
uint16_t exportflags;
|
2016-02-10 21:41:09 +03:00
|
|
|
bool fixedNewStyle = false;
|
2016-01-14 11:41:02 +03:00
|
|
|
|
2016-02-10 21:41:07 +03:00
|
|
|
if (read_sync(ioc, &globalflags, sizeof(globalflags)) !=
|
|
|
|
sizeof(globalflags)) {
|
2016-01-14 11:41:02 +03:00
|
|
|
error_setg(errp, "Failed to read server flags");
|
|
|
|
goto fail;
|
|
|
|
}
|
2016-02-10 21:41:09 +03:00
|
|
|
globalflags = be16_to_cpu(globalflags);
|
|
|
|
*flags = globalflags << 16;
|
|
|
|
TRACE("Global flags are %x", globalflags);
|
2016-02-10 21:41:07 +03:00
|
|
|
if (globalflags & NBD_FLAG_FIXED_NEWSTYLE) {
|
2016-02-10 21:41:09 +03:00
|
|
|
fixedNewStyle = true;
|
2016-02-10 21:41:07 +03:00
|
|
|
TRACE("Server supports fixed new style");
|
|
|
|
clientflags |= NBD_FLAG_C_FIXED_NEWSTYLE;
|
|
|
|
}
|
|
|
|
/* client requested flags */
|
2016-02-10 21:41:09 +03:00
|
|
|
clientflags = cpu_to_be32(clientflags);
|
2016-02-10 21:41:07 +03:00
|
|
|
if (write_sync(ioc, &clientflags, sizeof(clientflags)) !=
|
|
|
|
sizeof(clientflags)) {
|
|
|
|
error_setg(errp, "Failed to send clientflags field");
|
2016-01-14 11:41:02 +03:00
|
|
|
goto fail;
|
|
|
|
}
|
2016-02-10 21:41:11 +03:00
|
|
|
if (tlscreds) {
|
|
|
|
if (fixedNewStyle) {
|
|
|
|
*outioc = nbd_receive_starttls(ioc, tlscreds, hostname, errp);
|
|
|
|
if (!*outioc) {
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
ioc = *outioc;
|
|
|
|
} else {
|
|
|
|
error_setg(errp, "Server does not support STARTTLS");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
2016-02-10 21:41:05 +03:00
|
|
|
if (!name) {
|
2016-02-10 21:41:10 +03:00
|
|
|
TRACE("Using default NBD export name \"\"");
|
|
|
|
name = "";
|
2016-02-10 21:41:05 +03:00
|
|
|
}
|
2016-02-10 21:41:09 +03:00
|
|
|
if (fixedNewStyle) {
|
|
|
|
/* Check our desired export is present in the
|
|
|
|
* server export list. Since NBD_OPT_EXPORT_NAME
|
|
|
|
* cannot return an error message, running this
|
|
|
|
* query gives us good error reporting if the
|
|
|
|
* server required TLS
|
|
|
|
*/
|
|
|
|
if (nbd_receive_query_exports(ioc, name, errp) < 0) {
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* write the export name */
|
2016-01-14 11:41:02 +03:00
|
|
|
magic = cpu_to_be64(magic);
|
2016-02-10 21:41:04 +03:00
|
|
|
if (write_sync(ioc, &magic, sizeof(magic)) != sizeof(magic)) {
|
2016-01-14 11:41:02 +03:00
|
|
|
error_setg(errp, "Failed to send export name magic");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
opt = cpu_to_be32(NBD_OPT_EXPORT_NAME);
|
2016-02-10 21:41:04 +03:00
|
|
|
if (write_sync(ioc, &opt, sizeof(opt)) != sizeof(opt)) {
|
2016-01-14 11:41:02 +03:00
|
|
|
error_setg(errp, "Failed to send export name option number");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
namesize = cpu_to_be32(strlen(name));
|
2016-02-10 21:41:04 +03:00
|
|
|
if (write_sync(ioc, &namesize, sizeof(namesize)) !=
|
2016-01-14 11:41:02 +03:00
|
|
|
sizeof(namesize)) {
|
|
|
|
error_setg(errp, "Failed to send export name length");
|
|
|
|
goto fail;
|
|
|
|
}
|
2016-02-10 21:41:04 +03:00
|
|
|
if (write_sync(ioc, (char *)name, strlen(name)) != strlen(name)) {
|
2016-01-14 11:41:02 +03:00
|
|
|
error_setg(errp, "Failed to send export name");
|
|
|
|
goto fail;
|
|
|
|
}
|
2016-02-10 21:41:05 +03:00
|
|
|
|
|
|
|
if (read_sync(ioc, &s, sizeof(s)) != sizeof(s)) {
|
|
|
|
error_setg(errp, "Failed to read export length");
|
2016-01-14 11:41:02 +03:00
|
|
|
goto fail;
|
|
|
|
}
|
2016-02-10 21:41:05 +03:00
|
|
|
*size = be64_to_cpu(s);
|
|
|
|
TRACE("Size is %" PRIu64, *size);
|
2016-01-14 11:41:02 +03:00
|
|
|
|
2016-02-10 21:41:07 +03:00
|
|
|
if (read_sync(ioc, &exportflags, sizeof(exportflags)) !=
|
|
|
|
sizeof(exportflags)) {
|
2016-02-10 21:41:05 +03:00
|
|
|
error_setg(errp, "Failed to read export flags");
|
|
|
|
goto fail;
|
|
|
|
}
|
2016-02-10 21:41:09 +03:00
|
|
|
exportflags = be16_to_cpu(exportflags);
|
|
|
|
*flags |= exportflags;
|
|
|
|
TRACE("Export flags are %x", exportflags);
|
2016-02-10 21:41:05 +03:00
|
|
|
} else if (magic == NBD_CLIENT_MAGIC) {
|
|
|
|
if (name) {
|
|
|
|
error_setg(errp, "Server does not support export names");
|
|
|
|
goto fail;
|
|
|
|
}
|
2016-02-10 21:41:11 +03:00
|
|
|
if (tlscreds) {
|
|
|
|
error_setg(errp, "Server does not support STARTTLS");
|
|
|
|
goto fail;
|
|
|
|
}
|
2016-02-10 21:41:05 +03:00
|
|
|
|
|
|
|
if (read_sync(ioc, &s, sizeof(s)) != sizeof(s)) {
|
|
|
|
error_setg(errp, "Failed to read export length");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
*size = be64_to_cpu(s);
|
|
|
|
TRACE("Size is %" PRIu64, *size);
|
2016-01-14 11:41:02 +03:00
|
|
|
|
2016-02-10 21:41:04 +03:00
|
|
|
if (read_sync(ioc, flags, sizeof(*flags)) != sizeof(*flags)) {
|
2016-01-14 11:41:02 +03:00
|
|
|
error_setg(errp, "Failed to read export flags");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
*flags = be32_to_cpup(flags);
|
|
|
|
} else {
|
2016-02-10 21:41:05 +03:00
|
|
|
error_setg(errp, "Bad magic received");
|
|
|
|
goto fail;
|
2016-01-14 11:41:02 +03:00
|
|
|
}
|
2016-02-10 21:41:05 +03:00
|
|
|
|
2016-02-10 21:41:04 +03:00
|
|
|
if (read_sync(ioc, &buf, 124) != 124) {
|
2016-01-14 11:41:02 +03:00
|
|
|
error_setg(errp, "Failed to read reserved block");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
fail:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef __linux__
|
2016-02-10 21:41:04 +03:00
|
|
|
int nbd_init(int fd, QIOChannelSocket *sioc, uint32_t flags, off_t size)
|
2016-01-14 11:41:02 +03:00
|
|
|
{
|
|
|
|
TRACE("Setting NBD socket");
|
|
|
|
|
2016-02-10 21:41:04 +03:00
|
|
|
if (ioctl(fd, NBD_SET_SOCK, sioc->fd) < 0) {
|
2016-01-14 11:41:02 +03:00
|
|
|
int serrno = errno;
|
|
|
|
LOG("Failed to set NBD socket");
|
|
|
|
return -serrno;
|
|
|
|
}
|
|
|
|
|
|
|
|
TRACE("Setting block size to %lu", (unsigned long)BDRV_SECTOR_SIZE);
|
|
|
|
|
|
|
|
if (ioctl(fd, NBD_SET_BLKSIZE, (size_t)BDRV_SECTOR_SIZE) < 0) {
|
|
|
|
int serrno = errno;
|
|
|
|
LOG("Failed setting NBD block size");
|
|
|
|
return -serrno;
|
|
|
|
}
|
|
|
|
|
|
|
|
TRACE("Setting size to %zd block(s)", (size_t)(size / BDRV_SECTOR_SIZE));
|
|
|
|
|
|
|
|
if (ioctl(fd, NBD_SET_SIZE_BLOCKS, (size_t)(size / BDRV_SECTOR_SIZE)) < 0) {
|
|
|
|
int serrno = errno;
|
|
|
|
LOG("Failed setting size (in blocks)");
|
|
|
|
return -serrno;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ioctl(fd, NBD_SET_FLAGS, flags) < 0) {
|
|
|
|
if (errno == ENOTTY) {
|
|
|
|
int read_only = (flags & NBD_FLAG_READ_ONLY) != 0;
|
|
|
|
TRACE("Setting readonly attribute");
|
|
|
|
|
|
|
|
if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) {
|
|
|
|
int serrno = errno;
|
|
|
|
LOG("Failed setting read-only attribute");
|
|
|
|
return -serrno;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
int serrno = errno;
|
|
|
|
LOG("Failed setting flags");
|
|
|
|
return -serrno;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
TRACE("Negotiation ended");
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int nbd_client(int fd)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
int serrno;
|
|
|
|
|
|
|
|
TRACE("Doing NBD loop");
|
|
|
|
|
|
|
|
ret = ioctl(fd, NBD_DO_IT);
|
|
|
|
if (ret < 0 && errno == EPIPE) {
|
|
|
|
/* NBD_DO_IT normally returns EPIPE when someone has disconnected
|
|
|
|
* the socket via NBD_DISCONNECT. We do not want to return 1 in
|
|
|
|
* that case.
|
|
|
|
*/
|
|
|
|
ret = 0;
|
|
|
|
}
|
|
|
|
serrno = errno;
|
|
|
|
|
|
|
|
TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
|
|
|
|
|
|
|
|
TRACE("Clearing NBD queue");
|
|
|
|
ioctl(fd, NBD_CLEAR_QUE);
|
|
|
|
|
|
|
|
TRACE("Clearing NBD socket");
|
|
|
|
ioctl(fd, NBD_CLEAR_SOCK);
|
|
|
|
|
|
|
|
errno = serrno;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
#else
|
2016-02-10 21:41:04 +03:00
|
|
|
int nbd_init(int fd, QIOChannelSocket *ioc, uint32_t flags, off_t size)
|
2016-01-14 11:41:02 +03:00
|
|
|
{
|
|
|
|
return -ENOTSUP;
|
|
|
|
}
|
|
|
|
|
|
|
|
int nbd_client(int fd)
|
|
|
|
{
|
|
|
|
return -ENOTSUP;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2016-02-10 21:41:04 +03:00
|
|
|
ssize_t nbd_send_request(QIOChannel *ioc, struct nbd_request *request)
|
2016-01-14 11:41:02 +03:00
|
|
|
{
|
|
|
|
uint8_t buf[NBD_REQUEST_SIZE];
|
|
|
|
ssize_t ret;
|
|
|
|
|
|
|
|
cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC);
|
|
|
|
cpu_to_be32w((uint32_t*)(buf + 4), request->type);
|
|
|
|
cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
|
|
|
|
cpu_to_be64w((uint64_t*)(buf + 16), request->from);
|
|
|
|
cpu_to_be32w((uint32_t*)(buf + 24), request->len);
|
|
|
|
|
|
|
|
TRACE("Sending request to client: "
|
|
|
|
"{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}",
|
|
|
|
request->from, request->len, request->handle, request->type);
|
|
|
|
|
2016-02-10 21:41:04 +03:00
|
|
|
ret = write_sync(ioc, buf, sizeof(buf));
|
2016-01-14 11:41:02 +03:00
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ret != sizeof(buf)) {
|
|
|
|
LOG("writing to socket failed");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-02-10 21:41:04 +03:00
|
|
|
ssize_t nbd_receive_reply(QIOChannel *ioc, struct nbd_reply *reply)
|
2016-01-14 11:41:02 +03:00
|
|
|
{
|
|
|
|
uint8_t buf[NBD_REPLY_SIZE];
|
|
|
|
uint32_t magic;
|
|
|
|
ssize_t ret;
|
|
|
|
|
2016-02-10 21:41:04 +03:00
|
|
|
ret = read_sync(ioc, buf, sizeof(buf));
|
2016-01-14 11:41:02 +03:00
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ret != sizeof(buf)) {
|
|
|
|
LOG("read failed");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Reply
|
|
|
|
[ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
|
|
|
[ 4 .. 7] error (0 == no error)
|
|
|
|
[ 7 .. 15] handle
|
|
|
|
*/
|
|
|
|
|
|
|
|
magic = be32_to_cpup((uint32_t*)buf);
|
|
|
|
reply->error = be32_to_cpup((uint32_t*)(buf + 4));
|
|
|
|
reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
|
|
|
|
|
|
|
reply->error = nbd_errno_to_system_errno(reply->error);
|
|
|
|
|
|
|
|
TRACE("Got reply: "
|
|
|
|
"{ magic = 0x%x, .error = %d, handle = %" PRIu64" }",
|
|
|
|
magic, reply->error, reply->handle);
|
|
|
|
|
|
|
|
if (magic != NBD_REPLY_MAGIC) {
|
|
|
|
LOG("invalid magic (got 0x%x)", magic);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|