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[Qemu-block] [PATCH v2] util: remove the obsolete non-blocking connect
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From: |
Mao Zhongyi |
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Subject: |
[Qemu-block] [PATCH v2] util: remove the obsolete non-blocking connect |
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Date: |
Fri, 16 Jun 2017 15:31:07 +0800 |
From: Cao jin <address@hidden>
The non-blocking connect mechanism is obsolete, and it doesn't
work well in inet connection, because it will call getaddrinfo
first and getaddrinfo will blocks on DNS lookups. Since commit
e65c67e4 & d984464e, the non-blocking connect of migration goes
through QIOChannel in a different manner(using a thread), and
nobody use this old non-blocking connect anymore.
Any newly written code which needs a non-blocking connect should
use the QIOChannel code, so we can drop NonBlockingConnectHandler
as a concept entirely.
Cc: address@hidden
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Cc: address@hidden
Suggested-by: Daniel P. Berrange <address@hidden>
Signed-off-by: Cao jin <address@hidden>
Signed-off-by: Mao Zhongyi <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
Reviewed-by: Daniel P. Berrange <address@hidden>
---
v2:
1. block/ssh.c is not compiled in v1 which leads to no error
reported when I run make & make check, although I make a
mistake in block/ssh.c, because the package libssh2-devel
missed in my system. Now fixed it.
2. Write the prototype in a single line. [Juan Quintela]
Because it's a minor change, so still add the r-b.
v1:
This patch was reviewed by Daniel about a years ago, but it has never
been merged just since socket_connect() called by net_socket_connect_init()
where NonBlockingConnectHandler was passed to socket_connect(). it's broken.
Now this problem was worked around by Daniel's patch(commit 6701e551 'Revert
"Change net/socket.c to use socket_*() functions" again'). Therefore, resend
it, of course, part of related code has changed over the years, so changed
the patch accordingly.
The reviewed patch listed on:
https://lists.gnu.org/archive/html/qemu-devel/2016-07/msg06373.html
--help | 0
block/sheepdog.c | 2 +-
block/ssh.c | 2 +-
include/qemu/sockets.h | 12 +--
io/channel-socket.c | 2 +-
util/qemu-sockets.c | 205 ++++++-------------------------------------------
6 files changed, 28 insertions(+), 195 deletions(-)
create mode 100644 --help
diff --git a/--help b/--help
new file mode 100644
index 0000000..e69de29
diff --git a/block/sheepdog.c b/block/sheepdog.c
index a18315a..97e6c96 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -589,7 +589,7 @@ static int connect_to_sdog(BDRVSheepdogState *s, Error
**errp)
{
int fd;
- fd = socket_connect(s->addr, NULL, NULL, errp);
+ fd = socket_connect(s->addr, errp);
if (s->addr->type == SOCKET_ADDRESS_TYPE_INET && fd >= 0) {
int ret = socket_set_nodelay(fd);
diff --git a/block/ssh.c b/block/ssh.c
index 11203fc..d6a82ae 100644
--- a/block/ssh.c
+++ b/block/ssh.c
@@ -679,7 +679,7 @@ static int connect_to_ssh(BDRVSSHState *s, QDict *options,
}
/* Open the socket and connect. */
- s->sock = inet_connect_saddr(s->inet, NULL, NULL, errp);
+ s->sock = inet_connect_saddr(s->inet, errp);
if (s->sock < 0) {
ret = -EIO;
goto err;
diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
index 5c326db..dce0e41 100644
--- a/include/qemu/sockets.h
+++ b/include/qemu/sockets.h
@@ -27,18 +27,11 @@ int socket_set_fast_reuse(int fd);
#define SHUT_RDWR 2
#endif
-/* callback function for nonblocking connect
- * valid fd on success, negative error code on failure
- */
-typedef void NonBlockingConnectHandler(int fd, Error *err, void *opaque);
-
int inet_ai_family_from_address(InetSocketAddress *addr,
Error **errp);
int inet_parse(InetSocketAddress *addr, const char *str, Error **errp);
int inet_connect(const char *str, Error **errp);
-int inet_connect_saddr(InetSocketAddress *saddr,
- NonBlockingConnectHandler *callback, void *opaque,
- Error **errp);
+int inet_connect_saddr(InetSocketAddress *saddr, Error **errp);
NetworkAddressFamily inet_netfamily(int family);
@@ -46,8 +39,7 @@ int unix_listen(const char *path, char *ostr, int olen, Error
**errp);
int unix_connect(const char *path, Error **errp);
SocketAddress *socket_parse(const char *str, Error **errp);
-int socket_connect(SocketAddress *addr, NonBlockingConnectHandler *callback,
- void *opaque, Error **errp);
+int socket_connect(SocketAddress *addr, Error **errp);
int socket_listen(SocketAddress *addr, Error **errp);
void socket_listen_cleanup(int fd, Error **errp);
int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp);
diff --git a/io/channel-socket.c b/io/channel-socket.c
index 53386b7..05ea120 100644
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -140,7 +140,7 @@ int qio_channel_socket_connect_sync(QIOChannelSocket *ioc,
int fd;
trace_qio_channel_socket_connect_sync(ioc, addr);
- fd = socket_connect(addr, NULL, NULL, errp);
+ fd = socket_connect(addr, errp);
if (fd < 0) {
trace_qio_channel_socket_connect_fail(ioc);
return -1;
diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index 82290cb..af14f33 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -263,88 +263,19 @@ listen:
((rc) == -EINPROGRESS)
#endif
-/* Struct to store connect state for non blocking connect */
-typedef struct ConnectState {
- int fd;
- struct addrinfo *addr_list;
- struct addrinfo *current_addr;
- NonBlockingConnectHandler *callback;
- void *opaque;
-} ConnectState;
-
-static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
- ConnectState *connect_state, Error **errp);
+static int inet_connect_addr(struct addrinfo *addr, Error **errp);
-static void wait_for_connect(void *opaque)
-{
- ConnectState *s = opaque;
- int val = 0, rc = 0;
- socklen_t valsize = sizeof(val);
- bool in_progress;
- Error *err = NULL;
-
- qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
-
- do {
- rc = qemu_getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
- } while (rc == -1 && errno == EINTR);
-
- /* update rc to contain error */
- if (!rc && val) {
- rc = -1;
- errno = val;
- }
-
- /* connect error */
- if (rc < 0) {
- error_setg_errno(&err, errno, "Error connecting to socket");
- closesocket(s->fd);
- s->fd = rc;
- }
-
- /* try to connect to the next address on the list */
- if (s->current_addr) {
- while (s->current_addr->ai_next != NULL && s->fd < 0) {
- s->current_addr = s->current_addr->ai_next;
- s->fd = inet_connect_addr(s->current_addr, &in_progress, s, NULL);
- if (s->fd < 0) {
- error_free(err);
- err = NULL;
- error_setg_errno(&err, errno, "Unable to start socket
connect");
- }
- /* connect in progress */
- if (in_progress) {
- goto out;
- }
- }
-
- freeaddrinfo(s->addr_list);
- }
-
- if (s->callback) {
- s->callback(s->fd, err, s->opaque);
- }
- g_free(s);
-out:
- error_free(err);
-}
-
-static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
- ConnectState *connect_state, Error **errp)
+static int inet_connect_addr(struct addrinfo *addr, Error **errp)
{
int sock, rc;
- *in_progress = false;
-
sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
if (sock < 0) {
error_setg_errno(errp, errno, "Failed to create socket");
return -1;
}
socket_set_fast_reuse(sock);
- if (connect_state != NULL) {
- qemu_set_nonblock(sock);
- }
+
/* connect to peer */
do {
rc = 0;
@@ -353,15 +284,12 @@ static int inet_connect_addr(struct addrinfo *addr, bool
*in_progress,
}
} while (rc == -EINTR);
- if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
- connect_state->fd = sock;
- qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
- *in_progress = true;
- } else if (rc < 0) {
+ if (rc < 0) {
error_setg_errno(errp, errno, "Failed to connect socket");
closesocket(sock);
return -1;
}
+
return sock;
}
@@ -419,44 +347,24 @@ static struct addrinfo
*inet_parse_connect_saddr(InetSocketAddress *saddr,
*
* @saddr: Inet socket address specification
* @errp: set on error
- * @callback: callback function for non-blocking connect
- * @opaque: opaque for callback function
*
* Returns: -1 on error, file descriptor on success.
- *
- * If @callback is non-null, the connect is non-blocking. If this
- * function succeeds, callback will be called when the connection
- * completes, with the file descriptor on success, or -1 on error.
*/
-int inet_connect_saddr(InetSocketAddress *saddr,
- NonBlockingConnectHandler *callback, void *opaque,
- Error **errp)
+int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
{
Error *local_err = NULL;
struct addrinfo *res, *e;
int sock = -1;
- bool in_progress;
- ConnectState *connect_state = NULL;
res = inet_parse_connect_saddr(saddr, errp);
if (!res) {
return -1;
}
- if (callback != NULL) {
- connect_state = g_malloc0(sizeof(*connect_state));
- connect_state->addr_list = res;
- connect_state->callback = callback;
- connect_state->opaque = opaque;
- }
-
for (e = res; e != NULL; e = e->ai_next) {
error_free(local_err);
local_err = NULL;
- if (connect_state != NULL) {
- connect_state->current_addr = e;
- }
- sock = inet_connect_addr(e, &in_progress, connect_state, &local_err);
+ sock = inet_connect_addr(e, &local_err);
if (sock >= 0) {
break;
}
@@ -464,15 +372,8 @@ int inet_connect_saddr(InetSocketAddress *saddr,
if (sock < 0) {
error_propagate(errp, local_err);
- } else if (in_progress) {
- /* wait_for_connect() will do the rest */
- return sock;
- } else {
- if (callback) {
- callback(sock, NULL, opaque);
- }
}
- g_free(connect_state);
+
freeaddrinfo(res);
return sock;
}
@@ -655,7 +556,7 @@ int inet_connect(const char *str, Error **errp)
InetSocketAddress *addr = g_new(InetSocketAddress, 1);
if (!inet_parse(addr, str, errp)) {
- sock = inet_connect_saddr(addr, NULL, NULL, errp);
+ sock = inet_connect_saddr(addr, errp);
}
qapi_free_InetSocketAddress(addr);
return sock;
@@ -688,21 +589,16 @@ static bool vsock_parse_vaddr_to_sockaddr(const
VsockSocketAddress *vaddr,
return true;
}
-static int vsock_connect_addr(const struct sockaddr_vm *svm, bool *in_progress,
- ConnectState *connect_state, Error **errp)
+static int vsock_connect_addr(const struct sockaddr_vm *svm, Error **errp)
{
int sock, rc;
- *in_progress = false;
-
sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
if (sock < 0) {
error_setg_errno(errp, errno, "Failed to create socket");
return -1;
}
- if (connect_state != NULL) {
- qemu_set_nonblock(sock);
- }
+
/* connect to peer */
do {
rc = 0;
@@ -711,50 +607,26 @@ static int vsock_connect_addr(const struct sockaddr_vm
*svm, bool *in_progress,
}
} while (rc == -EINTR);
- if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
- connect_state->fd = sock;
- qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
- *in_progress = true;
- } else if (rc < 0) {
+ if (rc < 0) {
error_setg_errno(errp, errno, "Failed to connect socket");
closesocket(sock);
return -1;
}
+
return sock;
}
-static int vsock_connect_saddr(VsockSocketAddress *vaddr,
- NonBlockingConnectHandler *callback,
- void *opaque,
- Error **errp)
+static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
{
struct sockaddr_vm svm;
int sock = -1;
- bool in_progress;
- ConnectState *connect_state = NULL;
if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
return -1;
}
- if (callback != NULL) {
- connect_state = g_malloc0(sizeof(*connect_state));
- connect_state->callback = callback;
- connect_state->opaque = opaque;
- }
+ sock = vsock_connect_addr(&svm, errp);
- sock = vsock_connect_addr(&svm, &in_progress, connect_state, errp);
- if (sock < 0) {
- /* do nothing */
- } else if (in_progress) {
- /* wait_for_connect() will do the rest */
- return sock;
- } else {
- if (callback) {
- callback(sock, NULL, opaque);
- }
- }
- g_free(connect_state);
return sock;
}
@@ -814,9 +686,7 @@ static void vsock_unsupported(Error **errp)
error_setg(errp, "socket family AF_VSOCK unsupported");
}
-static int vsock_connect_saddr(VsockSocketAddress *vaddr,
- NonBlockingConnectHandler *callback,
- void *opaque, Error **errp)
+static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
{
vsock_unsupported(errp);
return -1;
@@ -919,12 +789,9 @@ err:
return -1;
}
-static int unix_connect_saddr(UnixSocketAddress *saddr,
- NonBlockingConnectHandler *callback, void
*opaque,
- Error **errp)
+static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
{
struct sockaddr_un un;
- ConnectState *connect_state = NULL;
int sock, rc;
if (saddr->path == NULL) {
@@ -937,12 +804,6 @@ static int unix_connect_saddr(UnixSocketAddress *saddr,
error_setg_errno(errp, errno, "Failed to create socket");
return -1;
}
- if (callback != NULL) {
- connect_state = g_malloc0(sizeof(*connect_state));
- connect_state->callback = callback;
- connect_state->opaque = opaque;
- qemu_set_nonblock(sock);
- }
if (strlen(saddr->path) > sizeof(un.sun_path)) {
error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
@@ -963,29 +824,16 @@ static int unix_connect_saddr(UnixSocketAddress *saddr,
}
} while (rc == -EINTR);
- if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
- connect_state->fd = sock;
- qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
- return sock;
- } else if (rc >= 0) {
- /* non blocking socket immediate success, call callback */
- if (callback != NULL) {
- callback(sock, NULL, opaque);
- }
- }
-
if (rc < 0) {
error_setg_errno(errp, -rc, "Failed to connect socket %s",
saddr->path);
goto err;
}
- g_free(connect_state);
return sock;
err:
close(sock);
- g_free(connect_state);
return -1;
}
@@ -1000,9 +848,7 @@ static int unix_listen_saddr(UnixSocketAddress *saddr,
return -1;
}
-static int unix_connect_saddr(UnixSocketAddress *saddr,
- NonBlockingConnectHandler *callback, void
*opaque,
- Error **errp)
+static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
{
error_setg(errp, "unix sockets are not available on windows");
errno = ENOTSUP;
@@ -1048,7 +894,7 @@ int unix_connect(const char *path, Error **errp)
saddr = g_new0(UnixSocketAddress, 1);
saddr->path = g_strdup(path);
- sock = unix_connect_saddr(saddr, NULL, NULL, errp);
+ sock = unix_connect_saddr(saddr, errp);
qapi_free_UnixSocketAddress(saddr);
return sock;
}
@@ -1093,30 +939,25 @@ fail:
return NULL;
}
-int socket_connect(SocketAddress *addr, NonBlockingConnectHandler *callback,
- void *opaque, Error **errp)
+int socket_connect(SocketAddress *addr, Error **errp)
{
int fd;
switch (addr->type) {
case SOCKET_ADDRESS_TYPE_INET:
- fd = inet_connect_saddr(&addr->u.inet, callback, opaque, errp);
+ fd = inet_connect_saddr(&addr->u.inet, errp);
break;
case SOCKET_ADDRESS_TYPE_UNIX:
- fd = unix_connect_saddr(&addr->u.q_unix, callback, opaque, errp);
+ fd = unix_connect_saddr(&addr->u.q_unix, errp);
break;
case SOCKET_ADDRESS_TYPE_FD:
fd = monitor_get_fd(cur_mon, addr->u.fd.str, errp);
- if (fd >= 0 && callback) {
- qemu_set_nonblock(fd);
- callback(fd, NULL, opaque);
- }
break;
case SOCKET_ADDRESS_TYPE_VSOCK:
- fd = vsock_connect_saddr(&addr->u.vsock, callback, opaque, errp);
+ fd = vsock_connect_saddr(&addr->u.vsock, errp);
break;
default:
--
2.9.3
- [Qemu-block] [PATCH v2] util: remove the obsolete non-blocking connect,
Mao Zhongyi <=