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[Qemu-block] [PATCH v4 01/14] nbd: convert block client to use I/O chann
From: |
Daniel P. Berrange |
Subject: |
[Qemu-block] [PATCH v4 01/14] nbd: convert block client to use I/O channels for connection setup |
Date: |
Thu, 21 Jan 2016 16:37:14 +0000 |
This converts the NBD block driver client to use the QIOChannelSocket
class for initial connection setup. The NbdClientSession struct has
two pointers, one to the master QIOChannelSocket providing the raw
data channel, and one to a QIOChannel which is the current channel
used for I/O. Initially the two point to the same object, but when
TLS support is added, they will point to different objects.
In this initial conversion though, all I/O is still actually done
using the raw POSIX sockets APIs.
Signed-off-by: Daniel P. Berrange <address@hidden>
---
Makefile | 6 ++---
block/nbd-client.c | 76 +++++++++++++++++++++++++++++++++---------------------
block/nbd-client.h | 8 ++++--
block/nbd.c | 39 ++++++++++++++--------------
tests/Makefile | 2 +-
5 files changed, 77 insertions(+), 54 deletions(-)
diff --git a/Makefile b/Makefile
index d0de2d4..b7b0f24 100644
--- a/Makefile
+++ b/Makefile
@@ -234,9 +234,9 @@ util/module.o-cflags =
-D'CONFIG_BLOCK_MODULES=$(block-modules)'
qemu-img.o: qemu-img-cmds.h
-qemu-img$(EXESUF): qemu-img.o $(block-obj-y) $(crypto-obj-y) $(qom-obj-y)
libqemuutil.a libqemustub.a
-qemu-nbd$(EXESUF): qemu-nbd.o $(block-obj-y) $(crypto-obj-y) $(qom-obj-y)
libqemuutil.a libqemustub.a
-qemu-io$(EXESUF): qemu-io.o $(block-obj-y) $(crypto-obj-y) $(qom-obj-y)
libqemuutil.a libqemustub.a
+qemu-img$(EXESUF): qemu-img.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y)
$(qom-obj-y) libqemuutil.a libqemustub.a
+qemu-nbd$(EXESUF): qemu-nbd.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y)
$(qom-obj-y) libqemuutil.a libqemustub.a
+qemu-io$(EXESUF): qemu-io.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y)
$(qom-obj-y) libqemuutil.a libqemustub.a
qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o
diff --git a/block/nbd-client.c b/block/nbd-client.c
index 568c56c..c4379a9 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -28,7 +28,6 @@
#include "qemu/osdep.h"
#include "nbd-client.h"
-#include "qemu/sockets.h"
#define HANDLE_TO_INDEX(bs, handle) ((handle) ^ ((uint64_t)(intptr_t)bs))
#define INDEX_TO_HANDLE(bs, index) ((index) ^ ((uint64_t)(intptr_t)bs))
@@ -48,13 +47,21 @@ static void nbd_teardown_connection(BlockDriverState *bs)
{
NbdClientSession *client = nbd_get_client_session(bs);
+ if (!client->ioc) { /* Already closed */
+ return;
+ }
+
/* finish any pending coroutines */
- shutdown(client->sock, 2);
+ qio_channel_shutdown(client->ioc,
+ QIO_CHANNEL_SHUTDOWN_BOTH,
+ NULL);
nbd_recv_coroutines_enter_all(client);
nbd_client_detach_aio_context(bs);
- closesocket(client->sock);
- client->sock = -1;
+ object_unref(OBJECT(client->sioc));
+ client->sioc = NULL;
+ object_unref(OBJECT(client->ioc));
+ client->ioc = NULL;
}
static void nbd_reply_ready(void *opaque)
@@ -64,12 +71,16 @@ static void nbd_reply_ready(void *opaque)
uint64_t i;
int ret;
+ if (!s->ioc) { /* Already closed */
+ return;
+ }
+
if (s->reply.handle == 0) {
/* No reply already in flight. Fetch a header. It is possible
* that another thread has done the same thing in parallel, so
* the socket is not readable anymore.
*/
- ret = nbd_receive_reply(s->sock, &s->reply);
+ ret = nbd_receive_reply(s->sioc->fd, &s->reply);
if (ret == -EAGAIN) {
return;
}
@@ -122,30 +133,32 @@ static int nbd_co_send_request(BlockDriverState *bs,
assert(i < MAX_NBD_REQUESTS);
request->handle = INDEX_TO_HANDLE(s, i);
+
+ if (!s->ioc) {
+ qemu_co_mutex_unlock(&s->send_mutex);
+ return -EPIPE;
+ }
+
s->send_coroutine = qemu_coroutine_self();
aio_context = bdrv_get_aio_context(bs);
- aio_set_fd_handler(aio_context, s->sock, false,
+ aio_set_fd_handler(aio_context, s->sioc->fd, false,
nbd_reply_ready, nbd_restart_write, bs);
if (qiov) {
- if (!s->is_unix) {
- socket_set_cork(s->sock, 1);
- }
- rc = nbd_send_request(s->sock, request);
+ qio_channel_set_cork(s->ioc, true);
+ rc = nbd_send_request(s->sioc->fd, request);
if (rc >= 0) {
- ret = qemu_co_sendv(s->sock, qiov->iov, qiov->niov,
+ ret = qemu_co_sendv(s->sioc->fd, qiov->iov, qiov->niov,
offset, request->len);
if (ret != request->len) {
rc = -EIO;
}
}
- if (!s->is_unix) {
- socket_set_cork(s->sock, 0);
- }
+ qio_channel_set_cork(s->ioc, false);
} else {
- rc = nbd_send_request(s->sock, request);
+ rc = nbd_send_request(s->sioc->fd, request);
}
- aio_set_fd_handler(aio_context, s->sock, false,
+ aio_set_fd_handler(aio_context, s->sioc->fd, false,
nbd_reply_ready, NULL, bs);
s->send_coroutine = NULL;
qemu_co_mutex_unlock(&s->send_mutex);
@@ -162,11 +175,12 @@ static void nbd_co_receive_reply(NbdClientSession *s,
* peek at the next reply and avoid yielding if it's ours? */
qemu_coroutine_yield();
*reply = s->reply;
- if (reply->handle != request->handle) {
+ if (reply->handle != request->handle ||
+ !s->ioc) {
reply->error = EIO;
} else {
if (qiov && reply->error == 0) {
- ret = qemu_co_recvv(s->sock, qiov->iov, qiov->niov,
+ ret = qemu_co_recvv(s->sioc->fd, qiov->iov, qiov->niov,
offset, request->len);
if (ret != request->len) {
reply->error = EIO;
@@ -350,14 +364,14 @@ int nbd_client_co_discard(BlockDriverState *bs, int64_t
sector_num,
void nbd_client_detach_aio_context(BlockDriverState *bs)
{
aio_set_fd_handler(bdrv_get_aio_context(bs),
- nbd_get_client_session(bs)->sock,
+ nbd_get_client_session(bs)->sioc->fd,
false, NULL, NULL, NULL);
}
void nbd_client_attach_aio_context(BlockDriverState *bs,
AioContext *new_context)
{
- aio_set_fd_handler(new_context, nbd_get_client_session(bs)->sock,
+ aio_set_fd_handler(new_context, nbd_get_client_session(bs)->sioc->fd,
false, nbd_reply_ready, NULL, bs);
}
@@ -370,39 +384,43 @@ void nbd_client_close(BlockDriverState *bs)
.len = 0
};
- if (client->sock == -1) {
+ if (client->ioc == NULL) {
return;
}
- nbd_send_request(client->sock, &request);
+ nbd_send_request(client->sioc->fd, &request);
nbd_teardown_connection(bs);
}
-int nbd_client_init(BlockDriverState *bs, int sock, const char *export,
- Error **errp)
+int nbd_client_init(BlockDriverState *bs, QIOChannelSocket *sioc,
+ const char *export, Error **errp)
{
NbdClientSession *client = nbd_get_client_session(bs);
int ret;
/* NBD handshake */
logout("session init %s\n", export);
- qemu_set_block(sock);
- ret = nbd_receive_negotiate(sock, export,
+ qio_channel_set_blocking(QIO_CHANNEL(sioc), true, NULL);
+
+ ret = nbd_receive_negotiate(sioc->fd, export,
&client->nbdflags, &client->size, errp);
if (ret < 0) {
logout("Failed to negotiate with the NBD server\n");
- closesocket(sock);
return ret;
}
qemu_co_mutex_init(&client->send_mutex);
qemu_co_mutex_init(&client->free_sema);
- client->sock = sock;
+ client->sioc = sioc;
+ object_ref(OBJECT(client->sioc));
+ 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. */
- qemu_set_nonblock(sock);
+ qio_channel_set_blocking(QIO_CHANNEL(sioc), false, NULL);
+
nbd_client_attach_aio_context(bs, bdrv_get_aio_context(bs));
logout("Established connection with NBD server\n");
diff --git a/block/nbd-client.h b/block/nbd-client.h
index e841340..e8b3283 100644
--- a/block/nbd-client.h
+++ b/block/nbd-client.h
@@ -4,6 +4,7 @@
#include "qemu-common.h"
#include "block/nbd.h"
#include "block/block_int.h"
+#include "io/channel-socket.h"
/* #define DEBUG_NBD */
@@ -17,7 +18,8 @@
#define MAX_NBD_REQUESTS 16
typedef struct NbdClientSession {
- int sock;
+ QIOChannelSocket *sioc; /* The master data channel */
+ QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */
uint32_t nbdflags;
off_t size;
@@ -34,7 +36,9 @@ typedef struct NbdClientSession {
NbdClientSession *nbd_get_client_session(BlockDriverState *bs);
-int nbd_client_init(BlockDriverState *bs, int sock, const char *export_name,
+int nbd_client_init(BlockDriverState *bs,
+ QIOChannelSocket *sock,
+ const char *export_name,
Error **errp);
void nbd_client_close(BlockDriverState *bs);
diff --git a/block/nbd.c b/block/nbd.c
index 1a90bc7..d7116e2 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -31,7 +31,6 @@
#include "qemu/uri.h"
#include "block/block_int.h"
#include "qemu/module.h"
-#include "qemu/sockets.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qjson.h"
#include "qapi/qmp/qint.h"
@@ -238,25 +237,25 @@ NbdClientSession *nbd_get_client_session(BlockDriverState
*bs)
return &s->client;
}
-static int nbd_establish_connection(BlockDriverState *bs,
- SocketAddress *saddr,
- Error **errp)
+static QIOChannelSocket *nbd_establish_connection(SocketAddress *saddr,
+ Error **errp)
{
- BDRVNBDState *s = bs->opaque;
- int sock;
+ QIOChannelSocket *sioc;
+ Error *local_err = NULL;
- sock = socket_connect(saddr, errp, NULL, NULL);
+ sioc = qio_channel_socket_new();
- if (sock < 0) {
- logout("Failed to establish connection to NBD server\n");
- return -EIO;
+ qio_channel_socket_connect_sync(sioc,
+ saddr,
+ &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return NULL;
}
- if (!s->client.is_unix) {
- socket_set_nodelay(sock);
- }
+ qio_channel_set_delay(QIO_CHANNEL(sioc), false);
- return sock;
+ return sioc;
}
static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
@@ -264,7 +263,8 @@ static int nbd_open(BlockDriverState *bs, QDict *options,
int flags,
{
BDRVNBDState *s = bs->opaque;
char *export = NULL;
- int result, sock;
+ int result;
+ QIOChannelSocket *sioc;
SocketAddress *saddr;
/* Pop the config into our state object. Exit if invalid. */
@@ -276,15 +276,16 @@ static int nbd_open(BlockDriverState *bs, QDict *options,
int flags,
/* establish TCP connection, return error if it fails
* TODO: Configurable retry-until-timeout behaviour.
*/
- sock = nbd_establish_connection(bs, saddr, errp);
+ sioc = nbd_establish_connection(saddr, errp);
qapi_free_SocketAddress(saddr);
- if (sock < 0) {
+ if (!sioc) {
g_free(export);
- return sock;
+ return -ECONNREFUSED;
}
/* NBD handshake */
- result = nbd_client_init(bs, sock, export, errp);
+ result = nbd_client_init(bs, sioc, export, errp);
+ object_unref(OBJECT(sioc));
g_free(export);
return result;
}
diff --git a/tests/Makefile b/tests/Makefile
index b7352f1..4c2958e 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -390,8 +390,8 @@ test-qapi-obj-y = tests/test-qapi-visit.o
tests/test-qapi-types.o \
tests/test-qapi-event.o tests/test-qmp-introspect.o \
$(test-qom-obj-y)
test-crypto-obj-y = $(crypto-obj-y) $(test-qom-obj-y)
-test-block-obj-y = $(block-obj-y) $(test-crypto-obj-y)
test-io-obj-y = $(io-obj-y) $(test-crypto-obj-y)
+test-block-obj-y = $(block-obj-y) $(test-io-obj-y)
tests/check-qint$(EXESUF): tests/check-qint.o $(test-util-obj-y)
tests/check-qstring$(EXESUF): tests/check-qstring.o $(test-util-obj-y)
--
2.5.0
- [Qemu-block] [PATCH v4 00/14] Implement TLS support to QEMU NBD server & client, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 03/14] nbd: convert blockdev NBD server to use I/O channels for connection setup, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 01/14] nbd: convert block client to use I/O channels for connection setup,
Daniel P. Berrange <=
- [Qemu-block] [PATCH v4 02/14] nbd: convert qemu-nbd server to use I/O channels for connection setup, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 05/14] nbd: invert client logic for negotiating protocol version, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 06/14] nbd: make server compliant with fixed newstyle spec, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 04/14] nbd: convert to using I/O channels for actual socket I/O, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 07/14] nbd: make client request fixed new style if advertized, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 08/14] nbd: allow setting of an export name for qemu-nbd server, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 09/14] nbd: always query export list in fixed new style protocol, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 10/14] nbd: use "" as a default export name if none provided, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 11/14] nbd: implement TLS support in the protocol negotiation, Daniel P. Berrange, 2016/01/21
- [Qemu-block] [PATCH v4 13/14] nbd: enable use of TLS with qemu-nbd server, Daniel P. Berrange, 2016/01/21