Ensure that the server is not sending unexpected chunk lengths for either the NONE or the OFFSET_DATA chunk, nor unexpected hole length for OFFSET_HOLE. This will flag any server as broken that responds to a zero-length read with an OFFSET_DATA (what our server currently does, but that's about to be fixed) or with OFFSET_HOLE, even though we previously fixed our client to never be able to send such a request over the wire. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20171108215703.9295-7-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
872 lines
25 KiB
C
872 lines
25 KiB
C
/*
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* QEMU Block driver for NBD
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*
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* Copyright (C) 2016 Red Hat, Inc.
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* Copyright (C) 2008 Bull S.A.S.
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* Author: Laurent Vivier <Laurent.Vivier@bull.net>
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*
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* Some parts:
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* Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "nbd-client.h"
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#define HANDLE_TO_INDEX(bs, handle) ((handle) ^ (uint64_t)(intptr_t)(bs))
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#define INDEX_TO_HANDLE(bs, index) ((index) ^ (uint64_t)(intptr_t)(bs))
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static void nbd_recv_coroutines_wake_all(NBDClientSession *s)
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{
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int i;
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for (i = 0; i < MAX_NBD_REQUESTS; i++) {
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NBDClientRequest *req = &s->requests[i];
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if (req->coroutine && req->receiving) {
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aio_co_wake(req->coroutine);
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}
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}
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}
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static void nbd_teardown_connection(BlockDriverState *bs)
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{
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NBDClientSession *client = nbd_get_client_session(bs);
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if (!client->ioc) { /* Already closed */
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return;
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}
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/* finish any pending coroutines */
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qio_channel_shutdown(client->ioc,
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QIO_CHANNEL_SHUTDOWN_BOTH,
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NULL);
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BDRV_POLL_WHILE(bs, client->read_reply_co);
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nbd_client_detach_aio_context(bs);
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object_unref(OBJECT(client->sioc));
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client->sioc = NULL;
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object_unref(OBJECT(client->ioc));
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client->ioc = NULL;
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}
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static coroutine_fn void nbd_read_reply_entry(void *opaque)
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{
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NBDClientSession *s = opaque;
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uint64_t i;
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int ret = 0;
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Error *local_err = NULL;
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while (!s->quit) {
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assert(s->reply.handle == 0);
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ret = nbd_receive_reply(s->ioc, &s->reply, &local_err);
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if (ret < 0) {
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error_report_err(local_err);
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}
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if (ret <= 0) {
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break;
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}
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/* There's no need for a mutex on the receive side, because the
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* handler acts as a synchronization point and ensures that only
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* one coroutine is called until the reply finishes.
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*/
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i = HANDLE_TO_INDEX(s, s->reply.handle);
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if (i >= MAX_NBD_REQUESTS ||
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!s->requests[i].coroutine ||
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!s->requests[i].receiving ||
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(nbd_reply_is_structured(&s->reply) && !s->info.structured_reply))
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{
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break;
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}
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/* We're woken up again by the request itself. Note that there
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* is no race between yielding and reentering read_reply_co. This
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* is because:
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*
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* - if the request runs on the same AioContext, it is only
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* entered after we yield
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*
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* - if the request runs on a different AioContext, reentering
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* read_reply_co happens through a bottom half, which can only
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* run after we yield.
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*/
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aio_co_wake(s->requests[i].coroutine);
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qemu_coroutine_yield();
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}
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s->quit = true;
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nbd_recv_coroutines_wake_all(s);
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s->read_reply_co = NULL;
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}
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static int nbd_co_send_request(BlockDriverState *bs,
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NBDRequest *request,
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QEMUIOVector *qiov)
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{
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NBDClientSession *s = nbd_get_client_session(bs);
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int rc, i;
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qemu_co_mutex_lock(&s->send_mutex);
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while (s->in_flight == MAX_NBD_REQUESTS) {
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qemu_co_queue_wait(&s->free_sema, &s->send_mutex);
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}
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s->in_flight++;
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for (i = 0; i < MAX_NBD_REQUESTS; i++) {
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if (s->requests[i].coroutine == NULL) {
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break;
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}
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}
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g_assert(qemu_in_coroutine());
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assert(i < MAX_NBD_REQUESTS);
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s->requests[i].coroutine = qemu_coroutine_self();
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s->requests[i].offset = request->from;
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s->requests[i].receiving = false;
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request->handle = INDEX_TO_HANDLE(s, i);
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if (s->quit) {
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rc = -EIO;
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goto err;
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}
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if (!s->ioc) {
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rc = -EPIPE;
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goto err;
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}
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if (qiov) {
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qio_channel_set_cork(s->ioc, true);
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rc = nbd_send_request(s->ioc, request);
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if (rc >= 0 && !s->quit) {
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if (qio_channel_writev_all(s->ioc, qiov->iov, qiov->niov,
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NULL) < 0) {
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rc = -EIO;
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}
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} else if (rc >= 0) {
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rc = -EIO;
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}
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qio_channel_set_cork(s->ioc, false);
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} else {
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rc = nbd_send_request(s->ioc, request);
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}
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err:
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if (rc < 0) {
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s->quit = true;
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s->requests[i].coroutine = NULL;
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s->in_flight--;
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qemu_co_queue_next(&s->free_sema);
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}
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qemu_co_mutex_unlock(&s->send_mutex);
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return rc;
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}
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static inline uint16_t payload_advance16(uint8_t **payload)
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{
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*payload += 2;
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return lduw_be_p(*payload - 2);
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}
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static inline uint32_t payload_advance32(uint8_t **payload)
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{
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*payload += 4;
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return ldl_be_p(*payload - 4);
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}
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static inline uint64_t payload_advance64(uint8_t **payload)
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{
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*payload += 8;
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return ldq_be_p(*payload - 8);
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}
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static int nbd_parse_offset_hole_payload(NBDStructuredReplyChunk *chunk,
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uint8_t *payload, uint64_t orig_offset,
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QEMUIOVector *qiov, Error **errp)
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{
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uint64_t offset;
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uint32_t hole_size;
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if (chunk->length != sizeof(offset) + sizeof(hole_size)) {
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error_setg(errp, "Protocol error: invalid payload for "
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"NBD_REPLY_TYPE_OFFSET_HOLE");
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return -EINVAL;
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}
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offset = payload_advance64(&payload);
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hole_size = payload_advance32(&payload);
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if (!hole_size || offset < orig_offset || hole_size > qiov->size ||
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offset > orig_offset + qiov->size - hole_size) {
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error_setg(errp, "Protocol error: server sent chunk exceeding requested"
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" region");
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return -EINVAL;
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}
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qemu_iovec_memset(qiov, offset - orig_offset, 0, hole_size);
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return 0;
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}
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/* nbd_parse_error_payload
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* on success @errp contains message describing nbd error reply
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*/
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static int nbd_parse_error_payload(NBDStructuredReplyChunk *chunk,
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uint8_t *payload, int *request_ret,
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Error **errp)
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{
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uint32_t error;
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uint16_t message_size;
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assert(chunk->type & (1 << 15));
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if (chunk->length < sizeof(error) + sizeof(message_size)) {
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error_setg(errp,
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"Protocol error: invalid payload for structured error");
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return -EINVAL;
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}
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error = nbd_errno_to_system_errno(payload_advance32(&payload));
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if (error == 0) {
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error_setg(errp, "Protocol error: server sent structured error chunk "
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"with error = 0");
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return -EINVAL;
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}
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*request_ret = -error;
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message_size = payload_advance16(&payload);
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if (message_size > chunk->length - sizeof(error) - sizeof(message_size)) {
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error_setg(errp, "Protocol error: server sent structured error chunk "
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"with incorrect message size");
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return -EINVAL;
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}
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/* TODO: Add a trace point to mention the server complaint */
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/* TODO handle ERROR_OFFSET */
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return 0;
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}
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static int nbd_co_receive_offset_data_payload(NBDClientSession *s,
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uint64_t orig_offset,
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QEMUIOVector *qiov, Error **errp)
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{
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QEMUIOVector sub_qiov;
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uint64_t offset;
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size_t data_size;
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int ret;
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NBDStructuredReplyChunk *chunk = &s->reply.structured;
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assert(nbd_reply_is_structured(&s->reply));
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/* The NBD spec requires at least one byte of payload */
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if (chunk->length <= sizeof(offset)) {
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error_setg(errp, "Protocol error: invalid payload for "
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"NBD_REPLY_TYPE_OFFSET_DATA");
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return -EINVAL;
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}
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if (nbd_read(s->ioc, &offset, sizeof(offset), errp) < 0) {
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return -EIO;
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}
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be64_to_cpus(&offset);
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data_size = chunk->length - sizeof(offset);
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assert(data_size);
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if (offset < orig_offset || data_size > qiov->size ||
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offset > orig_offset + qiov->size - data_size) {
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error_setg(errp, "Protocol error: server sent chunk exceeding requested"
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" region");
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return -EINVAL;
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}
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qemu_iovec_init(&sub_qiov, qiov->niov);
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qemu_iovec_concat(&sub_qiov, qiov, offset - orig_offset, data_size);
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ret = qio_channel_readv_all(s->ioc, sub_qiov.iov, sub_qiov.niov, errp);
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qemu_iovec_destroy(&sub_qiov);
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return ret < 0 ? -EIO : 0;
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}
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#define NBD_MAX_MALLOC_PAYLOAD 1000
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/* nbd_co_receive_structured_payload
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*/
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static coroutine_fn int nbd_co_receive_structured_payload(
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NBDClientSession *s, void **payload, Error **errp)
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{
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int ret;
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uint32_t len;
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assert(nbd_reply_is_structured(&s->reply));
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len = s->reply.structured.length;
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if (len == 0) {
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return 0;
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}
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if (payload == NULL) {
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error_setg(errp, "Unexpected structured payload");
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return -EINVAL;
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}
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if (len > NBD_MAX_MALLOC_PAYLOAD) {
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error_setg(errp, "Payload too large");
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return -EINVAL;
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}
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*payload = g_new(char, len);
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ret = nbd_read(s->ioc, *payload, len, errp);
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if (ret < 0) {
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g_free(*payload);
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*payload = NULL;
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return ret;
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}
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return 0;
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}
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/* nbd_co_do_receive_one_chunk
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* for simple reply:
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* set request_ret to received reply error
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* if qiov is not NULL: read payload to @qiov
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* for structured reply chunk:
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* if error chunk: read payload, set @request_ret, do not set @payload
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* else if offset_data chunk: read payload data to @qiov, do not set @payload
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* else: read payload to @payload
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*
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* If function fails, @errp contains corresponding error message, and the
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* connection with the server is suspect. If it returns 0, then the
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* transaction succeeded (although @request_ret may be a negative errno
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* corresponding to the server's error reply), and errp is unchanged.
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*/
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static coroutine_fn int nbd_co_do_receive_one_chunk(
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NBDClientSession *s, uint64_t handle, bool only_structured,
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int *request_ret, QEMUIOVector *qiov, void **payload, Error **errp)
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{
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int ret;
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int i = HANDLE_TO_INDEX(s, handle);
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void *local_payload = NULL;
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NBDStructuredReplyChunk *chunk;
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if (payload) {
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*payload = NULL;
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}
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*request_ret = 0;
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/* Wait until we're woken up by nbd_read_reply_entry. */
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s->requests[i].receiving = true;
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qemu_coroutine_yield();
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s->requests[i].receiving = false;
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if (!s->ioc || s->quit) {
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error_setg(errp, "Connection closed");
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return -EIO;
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}
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assert(s->reply.handle == handle);
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if (nbd_reply_is_simple(&s->reply)) {
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if (only_structured) {
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error_setg(errp, "Protocol error: simple reply when structured "
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"reply chunk was expected");
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return -EINVAL;
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}
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*request_ret = -nbd_errno_to_system_errno(s->reply.simple.error);
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if (*request_ret < 0 || !qiov) {
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return 0;
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}
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return qio_channel_readv_all(s->ioc, qiov->iov, qiov->niov,
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errp) < 0 ? -EIO : 0;
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}
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/* handle structured reply chunk */
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assert(s->info.structured_reply);
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chunk = &s->reply.structured;
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if (chunk->type == NBD_REPLY_TYPE_NONE) {
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if (!(chunk->flags & NBD_REPLY_FLAG_DONE)) {
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error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk without"
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" NBD_REPLY_FLAG_DONE flag set");
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return -EINVAL;
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}
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if (chunk->length) {
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error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk with"
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" nonzero length");
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return -EINVAL;
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}
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return 0;
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}
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if (chunk->type == NBD_REPLY_TYPE_OFFSET_DATA) {
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if (!qiov) {
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error_setg(errp, "Unexpected NBD_REPLY_TYPE_OFFSET_DATA chunk");
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return -EINVAL;
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}
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return nbd_co_receive_offset_data_payload(s, s->requests[i].offset,
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qiov, errp);
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}
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if (nbd_reply_type_is_error(chunk->type)) {
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payload = &local_payload;
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}
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ret = nbd_co_receive_structured_payload(s, payload, errp);
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if (ret < 0) {
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return ret;
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}
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if (nbd_reply_type_is_error(chunk->type)) {
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ret = nbd_parse_error_payload(chunk, local_payload, request_ret, errp);
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g_free(local_payload);
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return ret;
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}
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return 0;
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}
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/* nbd_co_receive_one_chunk
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* Read reply, wake up read_reply_co and set s->quit if needed.
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* Return value is a fatal error code or normal nbd reply error code
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*/
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static coroutine_fn int nbd_co_receive_one_chunk(
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NBDClientSession *s, uint64_t handle, bool only_structured,
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QEMUIOVector *qiov, NBDReply *reply, void **payload, Error **errp)
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{
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int request_ret;
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int ret = nbd_co_do_receive_one_chunk(s, handle, only_structured,
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&request_ret, qiov, payload, errp);
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if (ret < 0) {
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s->quit = true;
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} else {
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/* For assert at loop start in nbd_read_reply_entry */
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if (reply) {
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*reply = s->reply;
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}
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s->reply.handle = 0;
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ret = request_ret;
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}
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if (s->read_reply_co) {
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aio_co_wake(s->read_reply_co);
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}
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return ret;
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}
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typedef struct NBDReplyChunkIter {
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int ret;
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Error *err;
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bool done, only_structured;
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} NBDReplyChunkIter;
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static void nbd_iter_error(NBDReplyChunkIter *iter, bool fatal,
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int ret, Error **local_err)
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{
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assert(ret < 0);
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if (fatal || iter->ret == 0) {
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if (iter->ret != 0) {
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error_free(iter->err);
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iter->err = NULL;
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}
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iter->ret = ret;
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error_propagate(&iter->err, *local_err);
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} else {
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error_free(*local_err);
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}
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*local_err = NULL;
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}
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/* NBD_FOREACH_REPLY_CHUNK
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*/
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#define NBD_FOREACH_REPLY_CHUNK(s, iter, handle, structured, \
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qiov, reply, payload) \
|
|
for (iter = (NBDReplyChunkIter) { .only_structured = structured }; \
|
|
nbd_reply_chunk_iter_receive(s, &iter, handle, qiov, reply, payload);)
|
|
|
|
/* nbd_reply_chunk_iter_receive
|
|
*/
|
|
static bool nbd_reply_chunk_iter_receive(NBDClientSession *s,
|
|
NBDReplyChunkIter *iter,
|
|
uint64_t handle,
|
|
QEMUIOVector *qiov, NBDReply *reply,
|
|
void **payload)
|
|
{
|
|
int ret;
|
|
NBDReply local_reply;
|
|
NBDStructuredReplyChunk *chunk;
|
|
Error *local_err = NULL;
|
|
if (s->quit) {
|
|
error_setg(&local_err, "Connection closed");
|
|
nbd_iter_error(iter, true, -EIO, &local_err);
|
|
goto break_loop;
|
|
}
|
|
|
|
if (iter->done) {
|
|
/* Previous iteration was last. */
|
|
goto break_loop;
|
|
}
|
|
|
|
if (reply == NULL) {
|
|
reply = &local_reply;
|
|
}
|
|
|
|
ret = nbd_co_receive_one_chunk(s, handle, iter->only_structured,
|
|
qiov, reply, payload, &local_err);
|
|
if (ret < 0) {
|
|
/* If it is a fatal error s->quit is set by nbd_co_receive_one_chunk */
|
|
nbd_iter_error(iter, s->quit, ret, &local_err);
|
|
}
|
|
|
|
/* Do not execute the body of NBD_FOREACH_REPLY_CHUNK for simple reply. */
|
|
if (nbd_reply_is_simple(&s->reply) || s->quit) {
|
|
goto break_loop;
|
|
}
|
|
|
|
chunk = &reply->structured;
|
|
iter->only_structured = true;
|
|
|
|
if (chunk->type == NBD_REPLY_TYPE_NONE) {
|
|
/* NBD_REPLY_FLAG_DONE is already checked in nbd_co_receive_one_chunk */
|
|
assert(chunk->flags & NBD_REPLY_FLAG_DONE);
|
|
goto break_loop;
|
|
}
|
|
|
|
if (chunk->flags & NBD_REPLY_FLAG_DONE) {
|
|
/* This iteration is last. */
|
|
iter->done = true;
|
|
}
|
|
|
|
/* Execute the loop body */
|
|
return true;
|
|
|
|
break_loop:
|
|
s->requests[HANDLE_TO_INDEX(s, handle)].coroutine = NULL;
|
|
|
|
qemu_co_mutex_lock(&s->send_mutex);
|
|
s->in_flight--;
|
|
qemu_co_queue_next(&s->free_sema);
|
|
qemu_co_mutex_unlock(&s->send_mutex);
|
|
|
|
return false;
|
|
}
|
|
|
|
static int nbd_co_receive_return_code(NBDClientSession *s, uint64_t handle,
|
|
Error **errp)
|
|
{
|
|
NBDReplyChunkIter iter;
|
|
|
|
NBD_FOREACH_REPLY_CHUNK(s, iter, handle, false, NULL, NULL, NULL) {
|
|
/* nbd_reply_chunk_iter_receive does all the work */
|
|
}
|
|
|
|
error_propagate(errp, iter.err);
|
|
return iter.ret;
|
|
}
|
|
|
|
static int nbd_co_receive_cmdread_reply(NBDClientSession *s, uint64_t handle,
|
|
uint64_t offset, QEMUIOVector *qiov,
|
|
Error **errp)
|
|
{
|
|
NBDReplyChunkIter iter;
|
|
NBDReply reply;
|
|
void *payload = NULL;
|
|
Error *local_err = NULL;
|
|
|
|
NBD_FOREACH_REPLY_CHUNK(s, iter, handle, s->info.structured_reply,
|
|
qiov, &reply, &payload)
|
|
{
|
|
int ret;
|
|
NBDStructuredReplyChunk *chunk = &reply.structured;
|
|
|
|
assert(nbd_reply_is_structured(&reply));
|
|
|
|
switch (chunk->type) {
|
|
case NBD_REPLY_TYPE_OFFSET_DATA:
|
|
/* special cased in nbd_co_receive_one_chunk, data is already
|
|
* in qiov */
|
|
break;
|
|
case NBD_REPLY_TYPE_OFFSET_HOLE:
|
|
ret = nbd_parse_offset_hole_payload(&reply.structured, payload,
|
|
offset, qiov, &local_err);
|
|
if (ret < 0) {
|
|
s->quit = true;
|
|
nbd_iter_error(&iter, true, ret, &local_err);
|
|
}
|
|
break;
|
|
default:
|
|
if (!nbd_reply_type_is_error(chunk->type)) {
|
|
/* not allowed reply type */
|
|
s->quit = true;
|
|
error_setg(&local_err,
|
|
"Unexpected reply type: %d (%s) for CMD_READ",
|
|
chunk->type, nbd_reply_type_lookup(chunk->type));
|
|
nbd_iter_error(&iter, true, -EINVAL, &local_err);
|
|
}
|
|
}
|
|
|
|
g_free(payload);
|
|
payload = NULL;
|
|
}
|
|
|
|
error_propagate(errp, iter.err);
|
|
return iter.ret;
|
|
}
|
|
|
|
static int nbd_co_request(BlockDriverState *bs, NBDRequest *request,
|
|
QEMUIOVector *write_qiov)
|
|
{
|
|
int ret;
|
|
Error *local_err = NULL;
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
|
|
assert(request->type != NBD_CMD_READ);
|
|
if (write_qiov) {
|
|
assert(request->type == NBD_CMD_WRITE);
|
|
assert(request->len == iov_size(write_qiov->iov, write_qiov->niov));
|
|
} else {
|
|
assert(request->type != NBD_CMD_WRITE);
|
|
}
|
|
ret = nbd_co_send_request(bs, request, write_qiov);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = nbd_co_receive_return_code(client, request->handle, &local_err);
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int nbd_client_co_preadv(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov, int flags)
|
|
{
|
|
int ret;
|
|
Error *local_err = NULL;
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
NBDRequest request = {
|
|
.type = NBD_CMD_READ,
|
|
.from = offset,
|
|
.len = bytes,
|
|
};
|
|
|
|
assert(bytes <= NBD_MAX_BUFFER_SIZE);
|
|
assert(!flags);
|
|
|
|
if (!bytes) {
|
|
return 0;
|
|
}
|
|
ret = nbd_co_send_request(bs, &request, NULL);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = nbd_co_receive_cmdread_reply(client, request.handle, offset, qiov,
|
|
&local_err);
|
|
if (ret < 0) {
|
|
error_report_err(local_err);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int nbd_client_co_pwritev(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov, int flags)
|
|
{
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
NBDRequest request = {
|
|
.type = NBD_CMD_WRITE,
|
|
.from = offset,
|
|
.len = bytes,
|
|
};
|
|
|
|
assert(!(client->info.flags & NBD_FLAG_READ_ONLY));
|
|
if (flags & BDRV_REQ_FUA) {
|
|
assert(client->info.flags & NBD_FLAG_SEND_FUA);
|
|
request.flags |= NBD_CMD_FLAG_FUA;
|
|
}
|
|
|
|
assert(bytes <= NBD_MAX_BUFFER_SIZE);
|
|
|
|
if (!bytes) {
|
|
return 0;
|
|
}
|
|
return nbd_co_request(bs, &request, qiov);
|
|
}
|
|
|
|
int nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
|
|
int bytes, BdrvRequestFlags flags)
|
|
{
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
NBDRequest request = {
|
|
.type = NBD_CMD_WRITE_ZEROES,
|
|
.from = offset,
|
|
.len = bytes,
|
|
};
|
|
|
|
assert(!(client->info.flags & NBD_FLAG_READ_ONLY));
|
|
if (!(client->info.flags & NBD_FLAG_SEND_WRITE_ZEROES)) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (flags & BDRV_REQ_FUA) {
|
|
assert(client->info.flags & NBD_FLAG_SEND_FUA);
|
|
request.flags |= NBD_CMD_FLAG_FUA;
|
|
}
|
|
if (!(flags & BDRV_REQ_MAY_UNMAP)) {
|
|
request.flags |= NBD_CMD_FLAG_NO_HOLE;
|
|
}
|
|
|
|
if (!bytes) {
|
|
return 0;
|
|
}
|
|
return nbd_co_request(bs, &request, NULL);
|
|
}
|
|
|
|
int nbd_client_co_flush(BlockDriverState *bs)
|
|
{
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
NBDRequest request = { .type = NBD_CMD_FLUSH };
|
|
|
|
if (!(client->info.flags & NBD_FLAG_SEND_FLUSH)) {
|
|
return 0;
|
|
}
|
|
|
|
request.from = 0;
|
|
request.len = 0;
|
|
|
|
return nbd_co_request(bs, &request, NULL);
|
|
}
|
|
|
|
int nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
|
|
{
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
NBDRequest request = {
|
|
.type = NBD_CMD_TRIM,
|
|
.from = offset,
|
|
.len = bytes,
|
|
};
|
|
|
|
assert(!(client->info.flags & NBD_FLAG_READ_ONLY));
|
|
if (!(client->info.flags & NBD_FLAG_SEND_TRIM) || !bytes) {
|
|
return 0;
|
|
}
|
|
|
|
return nbd_co_request(bs, &request, NULL);
|
|
}
|
|
|
|
void nbd_client_detach_aio_context(BlockDriverState *bs)
|
|
{
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
qio_channel_detach_aio_context(QIO_CHANNEL(client->ioc));
|
|
}
|
|
|
|
void nbd_client_attach_aio_context(BlockDriverState *bs,
|
|
AioContext *new_context)
|
|
{
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
qio_channel_attach_aio_context(QIO_CHANNEL(client->ioc), new_context);
|
|
aio_co_schedule(new_context, client->read_reply_co);
|
|
}
|
|
|
|
void nbd_client_close(BlockDriverState *bs)
|
|
{
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
NBDRequest request = { .type = NBD_CMD_DISC };
|
|
|
|
if (client->ioc == NULL) {
|
|
return;
|
|
}
|
|
|
|
nbd_send_request(client->ioc, &request);
|
|
|
|
nbd_teardown_connection(bs);
|
|
}
|
|
|
|
int nbd_client_init(BlockDriverState *bs,
|
|
QIOChannelSocket *sioc,
|
|
const char *export,
|
|
QCryptoTLSCreds *tlscreds,
|
|
const char *hostname,
|
|
Error **errp)
|
|
{
|
|
NBDClientSession *client = nbd_get_client_session(bs);
|
|
int ret;
|
|
|
|
/* NBD handshake */
|
|
logout("session init %s\n", export);
|
|
qio_channel_set_blocking(QIO_CHANNEL(sioc), true, NULL);
|
|
|
|
client->info.request_sizes = true;
|
|
client->info.structured_reply = true;
|
|
ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), export,
|
|
tlscreds, hostname,
|
|
&client->ioc, &client->info, errp);
|
|
if (ret < 0) {
|
|
logout("Failed to negotiate with the NBD server\n");
|
|
return ret;
|
|
}
|
|
if (client->info.flags & NBD_FLAG_READ_ONLY &&
|
|
!bdrv_is_read_only(bs)) {
|
|
error_setg(errp,
|
|
"request for write access conflicts with read-only export");
|
|
return -EACCES;
|
|
}
|
|
if (client->info.flags & NBD_FLAG_SEND_FUA) {
|
|
bs->supported_write_flags = BDRV_REQ_FUA;
|
|
bs->supported_zero_flags |= BDRV_REQ_FUA;
|
|
}
|
|
if (client->info.flags & NBD_FLAG_SEND_WRITE_ZEROES) {
|
|
bs->supported_zero_flags |= BDRV_REQ_MAY_UNMAP;
|
|
}
|
|
if (client->info.min_block > bs->bl.request_alignment) {
|
|
bs->bl.request_alignment = client->info.min_block;
|
|
}
|
|
|
|
qemu_co_mutex_init(&client->send_mutex);
|
|
qemu_co_queue_init(&client->free_sema);
|
|
client->sioc = sioc;
|
|
object_ref(OBJECT(client->sioc));
|
|
|
|
if (!client->ioc) {
|
|
client->ioc = QIO_CHANNEL(sioc);
|
|
object_ref(OBJECT(client->ioc));
|
|
}
|
|
|
|
/* Now that we're connected, set the socket to be non-blocking and
|
|
* kick the reply mechanism. */
|
|
qio_channel_set_blocking(QIO_CHANNEL(sioc), false, NULL);
|
|
client->read_reply_co = qemu_coroutine_create(nbd_read_reply_entry, client);
|
|
nbd_client_attach_aio_context(bs, bdrv_get_aio_context(bs));
|
|
|
|
logout("Established connection with NBD server\n");
|
|
return 0;
|
|
}
|