nbd: Split nbd.c
We have NBD server code and client code, all mixed in a file. Now split them into separate files under nbd/, and update MAINTAINERS. filter_nbd for iotest 083 is updated to keep the log filtered out. Signed-off-by: Fam Zheng <famz@redhat.com> Message-Id: <1452760863-25350-3-git-send-email-famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Fam Zheng
Paolo Bonzini
parent
ee7d7aabda
commit
798bfe0006
@ -1116,8 +1116,9 @@ F: net/netmap.c
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Network Block Device (NBD)
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M: Paolo Bonzini <pbonzini@redhat.com>
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S: Odd Fixes
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F: block/nbd.c
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F: nbd.*
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F: block/nbd*
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F: nbd/
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F: include/block/nbd*
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F: qemu-nbd.c
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T: git git://github.com/bonzini/qemu.git nbd-next
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@ -8,7 +8,8 @@ util-obj-y += qmp-introspect.o qapi-types.o qapi-visit.o qapi-event.o
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# block-obj-y is code used by both qemu system emulation and qemu-img
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block-obj-y = async.o thread-pool.o
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block-obj-y += nbd.o block.o blockjob.o
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block-obj-y += nbd/
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block-obj-y += block.o blockjob.o
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block-obj-y += main-loop.o iohandler.o qemu-timer.o
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block-obj-$(CONFIG_POSIX) += aio-posix.o
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block-obj-$(CONFIG_WIN32) += aio-win32.o
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1
nbd/Makefile.objs
Normal file
1
nbd/Makefile.objs
Normal file
@ -0,0 +1 @@
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block-obj-y += server.o client.o common.o
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361
nbd/client.c
Normal file
361
nbd/client.c
Normal file
@ -0,0 +1,361 @@
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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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#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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int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
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off_t *size, Error **errp)
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{
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char buf[256];
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uint64_t magic, s;
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uint16_t tmp;
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int rc;
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TRACE("Receiving negotiation.");
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rc = -EINVAL;
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if (read_sync(csock, buf, 8) != 8) {
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error_setg(errp, "Failed to read data");
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goto fail;
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}
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buf[8] = '\0';
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if (strlen(buf) == 0) {
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error_setg(errp, "Server connection closed unexpectedly");
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goto fail;
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}
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TRACE("Magic is %c%c%c%c%c%c%c%c",
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qemu_isprint(buf[0]) ? buf[0] : '.',
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qemu_isprint(buf[1]) ? buf[1] : '.',
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qemu_isprint(buf[2]) ? buf[2] : '.',
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qemu_isprint(buf[3]) ? buf[3] : '.',
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qemu_isprint(buf[4]) ? buf[4] : '.',
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qemu_isprint(buf[5]) ? buf[5] : '.',
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qemu_isprint(buf[6]) ? buf[6] : '.',
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qemu_isprint(buf[7]) ? buf[7] : '.');
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if (memcmp(buf, "NBDMAGIC", 8) != 0) {
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error_setg(errp, "Invalid magic received");
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goto fail;
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}
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if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
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error_setg(errp, "Failed to read magic");
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goto fail;
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}
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magic = be64_to_cpu(magic);
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TRACE("Magic is 0x%" PRIx64, magic);
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if (name) {
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uint32_t reserved = 0;
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uint32_t opt;
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uint32_t namesize;
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TRACE("Checking magic (opts_magic)");
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if (magic != NBD_OPTS_MAGIC) {
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if (magic == NBD_CLIENT_MAGIC) {
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error_setg(errp, "Server does not support export names");
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} else {
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error_setg(errp, "Bad magic received");
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}
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goto fail;
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}
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if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
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error_setg(errp, "Failed to read server flags");
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goto fail;
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}
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*flags = be16_to_cpu(tmp) << 16;
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/* reserved for future use */
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if (write_sync(csock, &reserved, sizeof(reserved)) !=
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sizeof(reserved)) {
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error_setg(errp, "Failed to read reserved field");
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goto fail;
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}
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/* write the export name */
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magic = cpu_to_be64(magic);
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if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
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error_setg(errp, "Failed to send export name magic");
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goto fail;
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}
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opt = cpu_to_be32(NBD_OPT_EXPORT_NAME);
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if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) {
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error_setg(errp, "Failed to send export name option number");
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goto fail;
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}
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namesize = cpu_to_be32(strlen(name));
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if (write_sync(csock, &namesize, sizeof(namesize)) !=
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sizeof(namesize)) {
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error_setg(errp, "Failed to send export name length");
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goto fail;
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}
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if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) {
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error_setg(errp, "Failed to send export name");
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goto fail;
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}
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} else {
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TRACE("Checking magic (cli_magic)");
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if (magic != NBD_CLIENT_MAGIC) {
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if (magic == NBD_OPTS_MAGIC) {
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error_setg(errp, "Server requires an export name");
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} else {
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error_setg(errp, "Bad magic received");
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}
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goto fail;
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}
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}
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if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) {
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error_setg(errp, "Failed to read export length");
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goto fail;
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}
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*size = be64_to_cpu(s);
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TRACE("Size is %" PRIu64, *size);
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if (!name) {
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if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) {
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error_setg(errp, "Failed to read export flags");
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goto fail;
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}
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*flags = be32_to_cpup(flags);
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} else {
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if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
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error_setg(errp, "Failed to read export flags");
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goto fail;
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}
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*flags |= be16_to_cpu(tmp);
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}
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if (read_sync(csock, &buf, 124) != 124) {
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error_setg(errp, "Failed to read reserved block");
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goto fail;
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}
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rc = 0;
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fail:
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return rc;
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}
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#ifdef __linux__
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int nbd_init(int fd, int csock, uint32_t flags, off_t size)
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{
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TRACE("Setting NBD socket");
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if (ioctl(fd, NBD_SET_SOCK, csock) < 0) {
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int serrno = errno;
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LOG("Failed to set NBD socket");
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return -serrno;
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}
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TRACE("Setting block size to %lu", (unsigned long)BDRV_SECTOR_SIZE);
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if (ioctl(fd, NBD_SET_BLKSIZE, (size_t)BDRV_SECTOR_SIZE) < 0) {
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int serrno = errno;
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LOG("Failed setting NBD block size");
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return -serrno;
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}
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TRACE("Setting size to %zd block(s)", (size_t)(size / BDRV_SECTOR_SIZE));
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if (ioctl(fd, NBD_SET_SIZE_BLOCKS, (size_t)(size / BDRV_SECTOR_SIZE)) < 0) {
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int serrno = errno;
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LOG("Failed setting size (in blocks)");
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return -serrno;
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}
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if (ioctl(fd, NBD_SET_FLAGS, flags) < 0) {
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if (errno == ENOTTY) {
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int read_only = (flags & NBD_FLAG_READ_ONLY) != 0;
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TRACE("Setting readonly attribute");
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if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) {
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int serrno = errno;
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LOG("Failed setting read-only attribute");
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return -serrno;
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}
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} else {
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int serrno = errno;
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LOG("Failed setting flags");
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return -serrno;
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}
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}
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TRACE("Negotiation ended");
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return 0;
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}
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int nbd_client(int fd)
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{
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int ret;
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int serrno;
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TRACE("Doing NBD loop");
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ret = ioctl(fd, NBD_DO_IT);
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if (ret < 0 && errno == EPIPE) {
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/* NBD_DO_IT normally returns EPIPE when someone has disconnected
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* the socket via NBD_DISCONNECT. We do not want to return 1 in
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* that case.
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*/
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ret = 0;
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}
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serrno = errno;
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TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
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TRACE("Clearing NBD queue");
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ioctl(fd, NBD_CLEAR_QUE);
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TRACE("Clearing NBD socket");
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ioctl(fd, NBD_CLEAR_SOCK);
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errno = serrno;
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return ret;
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}
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#else
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int nbd_init(int fd, int csock, uint32_t flags, off_t size)
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{
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return -ENOTSUP;
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}
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int nbd_client(int fd)
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{
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return -ENOTSUP;
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}
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#endif
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ssize_t nbd_send_request(int csock, struct nbd_request *request)
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{
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uint8_t buf[NBD_REQUEST_SIZE];
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ssize_t ret;
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cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC);
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cpu_to_be32w((uint32_t*)(buf + 4), request->type);
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cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
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cpu_to_be64w((uint64_t*)(buf + 16), request->from);
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cpu_to_be32w((uint32_t*)(buf + 24), request->len);
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TRACE("Sending request to client: "
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"{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}",
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request->from, request->len, request->handle, request->type);
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ret = write_sync(csock, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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if (ret != sizeof(buf)) {
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LOG("writing to socket failed");
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return -EINVAL;
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}
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return 0;
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}
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ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply)
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{
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uint8_t buf[NBD_REPLY_SIZE];
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uint32_t magic;
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ssize_t ret;
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ret = read_sync(csock, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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if (ret != sizeof(buf)) {
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LOG("read failed");
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return -EINVAL;
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}
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/* Reply
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[ 0 .. 3] magic (NBD_REPLY_MAGIC)
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[ 4 .. 7] error (0 == no error)
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[ 7 .. 15] handle
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*/
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magic = be32_to_cpup((uint32_t*)buf);
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reply->error = be32_to_cpup((uint32_t*)(buf + 4));
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reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
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reply->error = nbd_errno_to_system_errno(reply->error);
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TRACE("Got reply: "
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"{ magic = 0x%x, .error = %d, handle = %" PRIu64" }",
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magic, reply->error, reply->handle);
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if (magic != NBD_REPLY_MAGIC) {
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LOG("invalid magic (got 0x%x)", magic);
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return -EINVAL;
|
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}
|
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return 0;
|
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}
|
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|
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64
nbd/common.c
Normal file
64
nbd/common.c
Normal file
@ -0,0 +1,64 @@
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/*
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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 "nbd-internal.h"
|
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|
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ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read)
|
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{
|
||||
size_t offset = 0;
|
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int err;
|
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|
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if (qemu_in_coroutine()) {
|
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if (do_read) {
|
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return qemu_co_recv(fd, buffer, size);
|
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} else {
|
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return qemu_co_send(fd, buffer, size);
|
||||
}
|
||||
}
|
||||
|
||||
while (offset < size) {
|
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ssize_t len;
|
||||
|
||||
if (do_read) {
|
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len = qemu_recv(fd, buffer + offset, size - offset, 0);
|
||||
} else {
|
||||
len = send(fd, buffer + offset, size - offset, 0);
|
||||
}
|
||||
|
||||
if (len < 0) {
|
||||
err = socket_error();
|
||||
|
||||
/* recoverable error */
|
||||
if (err == EINTR || (offset > 0 && (err == EAGAIN || err == EWOULDBLOCK))) {
|
||||
continue;
|
||||
}
|
||||
|
||||
/* unrecoverable error */
|
||||
return -err;
|
||||
}
|
||||
|
||||
/* eof */
|
||||
if (len == 0) {
|
||||
break;
|
||||
}
|
||||
|
||||
offset += len;
|
||||
}
|
||||
|
||||
return offset;
|
||||
}
|
||||
113
nbd/nbd-internal.h
Normal file
113
nbd/nbd-internal.h
Normal file
@ -0,0 +1,113 @@
|
||||
/*
|
||||
* NBD Internal Declarations
|
||||
*
|
||||
* Copyright (C) 2016 Red Hat, Inc.
|
||||
*
|
||||
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
||||
* See the COPYING file in the top-level directory.
|
||||
*/
|
||||
|
||||
#ifndef NBD_INTERNAL_H
|
||||
#define NBD_INTERNAL_H
|
||||
#include "block/nbd.h"
|
||||
#include "sysemu/block-backend.h"
|
||||
|
||||
#include "qemu/coroutine.h"
|
||||
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
#ifndef _WIN32
|
||||
#include <sys/ioctl.h>
|
||||
#endif
|
||||
#if defined(__sun__) || defined(__HAIKU__)
|
||||
#include <sys/ioccom.h>
|
||||
#endif
|
||||
#include <ctype.h>
|
||||
#include <inttypes.h>
|
||||
|
||||
#ifdef __linux__
|
||||
#include <linux/fs.h>
|
||||
#endif
|
||||
|
||||
#include "qemu/sockets.h"
|
||||
#include "qemu/queue.h"
|
||||
#include "qemu/main-loop.h"
|
||||
|
||||
/* #define DEBUG_NBD */
|
||||
|
||||
#ifdef DEBUG_NBD
|
||||
#define TRACE(msg, ...) do { \
|
||||
LOG(msg, ## __VA_ARGS__); \
|
||||
} while(0)
|
||||
#else
|
||||
#define TRACE(msg, ...) \
|
||||
do { } while (0)
|
||||
#endif
|
||||
|
||||
#define LOG(msg, ...) do { \
|
||||
fprintf(stderr, "%s:%s():L%d: " msg "\n", \
|
||||
__FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \
|
||||
} while(0)
|
||||
|
||||
/* This is all part of the "official" NBD API.
|
||||
*
|
||||
* The most up-to-date documentation is available at:
|
||||
* https://github.com/yoe/nbd/blob/master/doc/proto.txt
|
||||
*/
|
||||
|
||||
#define NBD_REQUEST_SIZE (4 + 4 + 8 + 8 + 4)
|
||||
#define NBD_REPLY_SIZE (4 + 4 + 8)
|
||||
#define NBD_REQUEST_MAGIC 0x25609513
|
||||
#define NBD_REPLY_MAGIC 0x67446698
|
||||
#define NBD_OPTS_MAGIC 0x49484156454F5054LL
|
||||
#define NBD_CLIENT_MAGIC 0x0000420281861253LL
|
||||
#define NBD_REP_MAGIC 0x3e889045565a9LL
|
||||
|
||||
#define NBD_SET_SOCK _IO(0xab, 0)
|
||||
#define NBD_SET_BLKSIZE _IO(0xab, 1)
|
||||
#define NBD_SET_SIZE _IO(0xab, 2)
|
||||
#define NBD_DO_IT _IO(0xab, 3)
|
||||
#define NBD_CLEAR_SOCK _IO(0xab, 4)
|
||||
#define NBD_CLEAR_QUE _IO(0xab, 5)
|
||||
#define NBD_PRINT_DEBUG _IO(0xab, 6)
|
||||
#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
|
||||
#define NBD_DISCONNECT _IO(0xab, 8)
|
||||
#define NBD_SET_TIMEOUT _IO(0xab, 9)
|
||||
#define NBD_SET_FLAGS _IO(0xab, 10)
|
||||
|
||||
#define NBD_OPT_EXPORT_NAME (1)
|
||||
#define NBD_OPT_ABORT (2)
|
||||
#define NBD_OPT_LIST (3)
|
||||
|
||||
/* NBD errors are based on errno numbers, so there is a 1:1 mapping,
|
||||
* but only a limited set of errno values is specified in the protocol.
|
||||
* Everything else is squashed to EINVAL.
|
||||
*/
|
||||
#define NBD_SUCCESS 0
|
||||
#define NBD_EPERM 1
|
||||
#define NBD_EIO 5
|
||||
#define NBD_ENOMEM 12
|
||||
#define NBD_EINVAL 22
|
||||
#define NBD_ENOSPC 28
|
||||
|
||||
static inline ssize_t read_sync(int fd, void *buffer, size_t size)
|
||||
{
|
||||
/* Sockets are kept in blocking mode in the negotiation phase. After
|
||||
* that, a non-readable socket simply means that another thread stole
|
||||
* our request/reply. Synchronization is done with recv_coroutine, so
|
||||
* that this is coroutine-safe.
|
||||
*/
|
||||
return nbd_wr_sync(fd, buffer, size, true);
|
||||
}
|
||||
|
||||
static inline ssize_t write_sync(int fd, void *buffer, size_t size)
|
||||
{
|
||||
int ret;
|
||||
do {
|
||||
/* For writes, we do expect the socket to be writable. */
|
||||
ret = nbd_wr_sync(fd, buffer, size, false);
|
||||
} while (ret == -EAGAIN);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif
|
||||
@ -1,7 +1,7 @@
|
||||
/*
|
||||
* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
|
||||
*
|
||||
* Network Block Device
|
||||
* Network Block Device Server Side
|
||||
*
|
||||
* 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
|
||||
@ -16,86 +16,7 @@
|
||||
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include "block/nbd.h"
|
||||
#include "sysemu/block-backend.h"
|
||||
|
||||
#include "qemu/coroutine.h"
|
||||
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
#ifndef _WIN32
|
||||
#include <sys/ioctl.h>
|
||||
#endif
|
||||
#if defined(__sun__) || defined(__HAIKU__)
|
||||
#include <sys/ioccom.h>
|
||||
#endif
|
||||
#include <ctype.h>
|
||||
#include <inttypes.h>
|
||||
|
||||
#ifdef __linux__
|
||||
#include <linux/fs.h>
|
||||
#endif
|
||||
|
||||
#include "qemu/sockets.h"
|
||||
#include "qemu/queue.h"
|
||||
#include "qemu/main-loop.h"
|
||||
|
||||
//#define DEBUG_NBD
|
||||
|
||||
#ifdef DEBUG_NBD
|
||||
#define TRACE(msg, ...) do { \
|
||||
LOG(msg, ## __VA_ARGS__); \
|
||||
} while(0)
|
||||
#else
|
||||
#define TRACE(msg, ...) \
|
||||
do { } while (0)
|
||||
#endif
|
||||
|
||||
#define LOG(msg, ...) do { \
|
||||
fprintf(stderr, "%s:%s():L%d: " msg "\n", \
|
||||
__FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \
|
||||
} while(0)
|
||||
|
||||
/* This is all part of the "official" NBD API.
|
||||
*
|
||||
* The most up-to-date documentation is available at:
|
||||
* https://github.com/yoe/nbd/blob/master/doc/proto.txt
|
||||
*/
|
||||
|
||||
#define NBD_REQUEST_SIZE (4 + 4 + 8 + 8 + 4)
|
||||
#define NBD_REPLY_SIZE (4 + 4 + 8)
|
||||
#define NBD_REQUEST_MAGIC 0x25609513
|
||||
#define NBD_REPLY_MAGIC 0x67446698
|
||||
#define NBD_OPTS_MAGIC 0x49484156454F5054LL
|
||||
#define NBD_CLIENT_MAGIC 0x0000420281861253LL
|
||||
#define NBD_REP_MAGIC 0x3e889045565a9LL
|
||||
|
||||
#define NBD_SET_SOCK _IO(0xab, 0)
|
||||
#define NBD_SET_BLKSIZE _IO(0xab, 1)
|
||||
#define NBD_SET_SIZE _IO(0xab, 2)
|
||||
#define NBD_DO_IT _IO(0xab, 3)
|
||||
#define NBD_CLEAR_SOCK _IO(0xab, 4)
|
||||
#define NBD_CLEAR_QUE _IO(0xab, 5)
|
||||
#define NBD_PRINT_DEBUG _IO(0xab, 6)
|
||||
#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
|
||||
#define NBD_DISCONNECT _IO(0xab, 8)
|
||||
#define NBD_SET_TIMEOUT _IO(0xab, 9)
|
||||
#define NBD_SET_FLAGS _IO(0xab, 10)
|
||||
|
||||
#define NBD_OPT_EXPORT_NAME (1)
|
||||
#define NBD_OPT_ABORT (2)
|
||||
#define NBD_OPT_LIST (3)
|
||||
|
||||
/* NBD errors are based on errno numbers, so there is a 1:1 mapping,
|
||||
* but only a limited set of errno values is specified in the protocol.
|
||||
* Everything else is squashed to EINVAL.
|
||||
*/
|
||||
#define NBD_SUCCESS 0
|
||||
#define NBD_EPERM 1
|
||||
#define NBD_EIO 5
|
||||
#define NBD_ENOMEM 12
|
||||
#define NBD_EINVAL 22
|
||||
#define NBD_ENOSPC 28
|
||||
#include "nbd-internal.h"
|
||||
|
||||
static int system_errno_to_nbd_errno(int err)
|
||||
{
|
||||
@ -120,25 +41,6 @@ static int system_errno_to_nbd_errno(int err)
|
||||
}
|
||||
}
|
||||
|
||||
static int nbd_errno_to_system_errno(int err)
|
||||
{
|
||||
switch (err) {
|
||||
case NBD_SUCCESS:
|
||||
return 0;
|
||||
case NBD_EPERM:
|
||||
return EPERM;
|
||||
case NBD_EIO:
|
||||
return EIO;
|
||||
case NBD_ENOMEM:
|
||||
return ENOMEM;
|
||||
case NBD_ENOSPC:
|
||||
return ENOSPC;
|
||||
case NBD_EINVAL:
|
||||
default:
|
||||
return EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
/* Definitions for opaque data types */
|
||||
|
||||
typedef struct NBDRequest NBDRequest;
|
||||
@ -191,61 +93,6 @@ static void nbd_set_handlers(NBDClient *client);
|
||||
static void nbd_unset_handlers(NBDClient *client);
|
||||
static void nbd_update_can_read(NBDClient *client);
|
||||
|
||||
ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read)
|
||||
{
|
||||
size_t offset = 0;
|
||||
int err;
|
||||
|
||||
if (qemu_in_coroutine()) {
|
||||
if (do_read) {
|
||||
return qemu_co_recv(fd, buffer, size);
|
||||
} else {
|
||||
return qemu_co_send(fd, buffer, size);
|
||||
}
|
||||
}
|
||||
|
||||
while (offset < size) {
|
||||
ssize_t len;
|
||||
|
||||
if (do_read) {
|
||||
len = qemu_recv(fd, buffer + offset, size - offset, 0);
|
||||
} else {
|
||||
len = send(fd, buffer + offset, size - offset, 0);
|
||||
}
|
||||
|
||||
if (len < 0) {
|
||||
err = socket_error();
|
||||
|
||||
/* recoverable error */
|
||||
if (err == EINTR || (offset > 0 && (err == EAGAIN || err == EWOULDBLOCK))) {
|
||||
continue;
|
||||
}
|
||||
|
||||
/* unrecoverable error */
|
||||
return -err;
|
||||
}
|
||||
|
||||
/* eof */
|
||||
if (len == 0) {
|
||||
break;
|
||||
}
|
||||
|
||||
offset += len;
|
||||
}
|
||||
|
||||
return offset;
|
||||
}
|
||||
|
||||
static ssize_t read_sync(int fd, void *buffer, size_t size)
|
||||
{
|
||||
/* Sockets are kept in blocking mode in the negotiation phase. After
|
||||
* that, a non-readable socket simply means that another thread stole
|
||||
* our request/reply. Synchronization is done with recv_coroutine, so
|
||||
* that this is coroutine-safe.
|
||||
*/
|
||||
return nbd_wr_sync(fd, buffer, size, true);
|
||||
}
|
||||
|
||||
static ssize_t drop_sync(int fd, size_t size)
|
||||
{
|
||||
ssize_t ret, dropped = size;
|
||||
@ -266,16 +113,6 @@ static ssize_t drop_sync(int fd, size_t size)
|
||||
return dropped;
|
||||
}
|
||||
|
||||
static ssize_t write_sync(int fd, void *buffer, size_t size)
|
||||
{
|
||||
int ret;
|
||||
do {
|
||||
/* For writes, we do expect the socket to be writable. */
|
||||
ret = nbd_wr_sync(fd, buffer, size, false);
|
||||
} while (ret == -EAGAIN);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Basic flow for negotiation
|
||||
|
||||
Server Client
|
||||
@ -579,188 +416,7 @@ fail:
|
||||
return rc;
|
||||
}
|
||||
|
||||
int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
|
||||
off_t *size, Error **errp)
|
||||
{
|
||||
char buf[256];
|
||||
uint64_t magic, s;
|
||||
uint16_t tmp;
|
||||
int rc;
|
||||
|
||||
TRACE("Receiving negotiation.");
|
||||
|
||||
rc = -EINVAL;
|
||||
|
||||
if (read_sync(csock, buf, 8) != 8) {
|
||||
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;
|
||||
}
|
||||
|
||||
if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
|
||||
error_setg(errp, "Failed to read magic");
|
||||
goto fail;
|
||||
}
|
||||
magic = be64_to_cpu(magic);
|
||||
TRACE("Magic is 0x%" PRIx64, magic);
|
||||
|
||||
if (name) {
|
||||
uint32_t reserved = 0;
|
||||
uint32_t opt;
|
||||
uint32_t namesize;
|
||||
|
||||
TRACE("Checking magic (opts_magic)");
|
||||
if (magic != NBD_OPTS_MAGIC) {
|
||||
if (magic == NBD_CLIENT_MAGIC) {
|
||||
error_setg(errp, "Server does not support export names");
|
||||
} else {
|
||||
error_setg(errp, "Bad magic received");
|
||||
}
|
||||
goto fail;
|
||||
}
|
||||
if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
|
||||
error_setg(errp, "Failed to read server flags");
|
||||
goto fail;
|
||||
}
|
||||
*flags = be16_to_cpu(tmp) << 16;
|
||||
/* reserved for future use */
|
||||
if (write_sync(csock, &reserved, sizeof(reserved)) !=
|
||||
sizeof(reserved)) {
|
||||
error_setg(errp, "Failed to read reserved field");
|
||||
goto fail;
|
||||
}
|
||||
/* write the export name */
|
||||
magic = cpu_to_be64(magic);
|
||||
if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
|
||||
error_setg(errp, "Failed to send export name magic");
|
||||
goto fail;
|
||||
}
|
||||
opt = cpu_to_be32(NBD_OPT_EXPORT_NAME);
|
||||
if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) {
|
||||
error_setg(errp, "Failed to send export name option number");
|
||||
goto fail;
|
||||
}
|
||||
namesize = cpu_to_be32(strlen(name));
|
||||
if (write_sync(csock, &namesize, sizeof(namesize)) !=
|
||||
sizeof(namesize)) {
|
||||
error_setg(errp, "Failed to send export name length");
|
||||
goto fail;
|
||||
}
|
||||
if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) {
|
||||
error_setg(errp, "Failed to send export name");
|
||||
goto fail;
|
||||
}
|
||||
} else {
|
||||
TRACE("Checking magic (cli_magic)");
|
||||
|
||||
if (magic != NBD_CLIENT_MAGIC) {
|
||||
if (magic == NBD_OPTS_MAGIC) {
|
||||
error_setg(errp, "Server requires an export name");
|
||||
} else {
|
||||
error_setg(errp, "Bad magic received");
|
||||
}
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
|
||||
if (read_sync(csock, &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);
|
||||
|
||||
if (!name) {
|
||||
if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) {
|
||||
error_setg(errp, "Failed to read export flags");
|
||||
goto fail;
|
||||
}
|
||||
*flags = be32_to_cpup(flags);
|
||||
} else {
|
||||
if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
|
||||
error_setg(errp, "Failed to read export flags");
|
||||
goto fail;
|
||||
}
|
||||
*flags |= be16_to_cpu(tmp);
|
||||
}
|
||||
if (read_sync(csock, &buf, 124) != 124) {
|
||||
error_setg(errp, "Failed to read reserved block");
|
||||
goto fail;
|
||||
}
|
||||
rc = 0;
|
||||
|
||||
fail:
|
||||
return rc;
|
||||
}
|
||||
|
||||
#ifdef __linux__
|
||||
int nbd_init(int fd, int csock, uint32_t flags, off_t size)
|
||||
{
|
||||
TRACE("Setting NBD socket");
|
||||
|
||||
if (ioctl(fd, NBD_SET_SOCK, csock) < 0) {
|
||||
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_disconnect(int fd)
|
||||
{
|
||||
@ -770,78 +426,14 @@ int nbd_disconnect(int fd)
|
||||
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
|
||||
int nbd_init(int fd, int csock, uint32_t flags, off_t size)
|
||||
{
|
||||
return -ENOTSUP;
|
||||
}
|
||||
|
||||
int nbd_disconnect(int fd)
|
||||
{
|
||||
return -ENOTSUP;
|
||||
}
|
||||
|
||||
int nbd_client(int fd)
|
||||
{
|
||||
return -ENOTSUP;
|
||||
}
|
||||
#endif
|
||||
|
||||
ssize_t nbd_send_request(int csock, struct nbd_request *request)
|
||||
{
|
||||
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);
|
||||
|
||||
ret = write_sync(csock, buf, sizeof(buf));
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (ret != sizeof(buf)) {
|
||||
LOG("writing to socket failed");
|
||||
return -EINVAL;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t nbd_receive_request(int csock, struct nbd_request *request)
|
||||
{
|
||||
uint8_t buf[NBD_REQUEST_SIZE];
|
||||
@ -883,45 +475,6 @@ static ssize_t nbd_receive_request(int csock, struct nbd_request *request)
|
||||
return 0;
|
||||
}
|
||||
|
||||
ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply)
|
||||
{
|
||||
uint8_t buf[NBD_REPLY_SIZE];
|
||||
uint32_t magic;
|
||||
ssize_t ret;
|
||||
|
||||
ret = read_sync(csock, buf, sizeof(buf));
|
||||
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;
|
||||
}
|
||||
|
||||
static ssize_t nbd_send_reply(int csock, struct nbd_reply *reply)
|
||||
{
|
||||
uint8_t buf[NBD_REPLY_SIZE];
|
||||
@ -55,7 +55,7 @@ filter_nbd() {
|
||||
# callbacks sometimes, making them unreliable.
|
||||
#
|
||||
# Filter out the TCP port number since this changes between runs.
|
||||
sed -e 's#^.*nbd\.c:.*##g' \
|
||||
sed -e 's#^.*nbd/.*\.c:.*##g' \
|
||||
-e 's#nbd:127\.0\.0\.1:[^:]*:#nbd:127\.0\.0\.1:PORT:#g' \
|
||||
-e 's#\(exportname=foo\|PORT\): Failed to .*$#\1#'
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user