qemu-kvm/SOURCES/kvm-virtiofsd-add-fd-FDNUM-fd-passing-option.patch

171 lines
5.5 KiB
Diff

From f91a9bdc171142174110e9ff1716b611f6fb0039 Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Mon, 27 Jan 2020 19:01:07 +0100
Subject: [PATCH 036/116] virtiofsd: add --fd=FDNUM fd passing option
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: <20200127190227.40942-33-dgilbert@redhat.com>
Patchwork-id: 93487
O-Subject: [RHEL-AV-8.2 qemu-kvm PATCH 032/112] virtiofsd: add --fd=FDNUM fd passing option
Bugzilla: 1694164
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
From: Stefan Hajnoczi <stefanha@redhat.com>
Although --socket-path=PATH is useful for manual invocations, management
tools typically create the UNIX domain socket themselves and pass it to
the vhost-user device backend. This way QEMU can be launched
immediately with a valid socket. No waiting for the vhost-user device
backend is required when fd passing is used.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit cee8e35d4386e34bf79c3ca2aab7f7b1bb48cf8d)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
tools/virtiofsd/fuse_i.h | 1 +
tools/virtiofsd/fuse_lowlevel.c | 16 ++++++++++++----
tools/virtiofsd/fuse_virtio.c | 31 +++++++++++++++++++++++++------
3 files changed, 38 insertions(+), 10 deletions(-)
diff --git a/tools/virtiofsd/fuse_i.h b/tools/virtiofsd/fuse_i.h
index 1126723..45995f3 100644
--- a/tools/virtiofsd/fuse_i.h
+++ b/tools/virtiofsd/fuse_i.h
@@ -68,6 +68,7 @@ struct fuse_session {
size_t bufsize;
int error;
char *vu_socket_path;
+ int vu_listen_fd;
int vu_socketfd;
struct fv_VuDev *virtio_dev;
};
diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
index 4f4684d..95f4db8 100644
--- a/tools/virtiofsd/fuse_lowlevel.c
+++ b/tools/virtiofsd/fuse_lowlevel.c
@@ -2130,6 +2130,7 @@ static const struct fuse_opt fuse_ll_opts[] = {
LL_OPTION("--debug", debug, 1),
LL_OPTION("allow_root", deny_others, 1),
LL_OPTION("--socket-path=%s", vu_socket_path, 0),
+ LL_OPTION("--fd=%d", vu_listen_fd, 0),
FUSE_OPT_END
};
@@ -2147,7 +2148,8 @@ void fuse_lowlevel_help(void)
*/
printf(
" -o allow_root allow access by root\n"
- " --socket-path=PATH path for the vhost-user socket\n");
+ " --socket-path=PATH path for the vhost-user socket\n"
+ " --fd=FDNUM fd number of vhost-user socket\n");
}
void fuse_session_destroy(struct fuse_session *se)
@@ -2191,6 +2193,7 @@ struct fuse_session *fuse_session_new(struct fuse_args *args,
goto out1;
}
se->fd = -1;
+ se->vu_listen_fd = -1;
se->conn.max_write = UINT_MAX;
se->conn.max_readahead = UINT_MAX;
@@ -2212,8 +2215,13 @@ struct fuse_session *fuse_session_new(struct fuse_args *args,
goto out4;
}
- if (!se->vu_socket_path) {
- fprintf(stderr, "fuse: missing -o vhost_user_socket option\n");
+ if (!se->vu_socket_path && se->vu_listen_fd < 0) {
+ fuse_log(FUSE_LOG_ERR, "fuse: missing --socket-path or --fd option\n");
+ goto out4;
+ }
+ if (se->vu_socket_path && se->vu_listen_fd >= 0) {
+ fuse_log(FUSE_LOG_ERR,
+ "fuse: --socket-path and --fd cannot be given together\n");
goto out4;
}
@@ -2253,7 +2261,7 @@ void fuse_session_unmount(struct fuse_session *se)
int fuse_lowlevel_is_virtio(struct fuse_session *se)
{
- return se->vu_socket_path != NULL;
+ return !!se->virtio_dev;
}
#ifdef linux
diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c
index 7e2711b..635f877 100644
--- a/tools/virtiofsd/fuse_virtio.c
+++ b/tools/virtiofsd/fuse_virtio.c
@@ -638,18 +638,21 @@ int virtio_loop(struct fuse_session *se)
return 0;
}
-int virtio_session_mount(struct fuse_session *se)
+static int fv_create_listen_socket(struct fuse_session *se)
{
struct sockaddr_un un;
mode_t old_umask;
+ /* Nothing to do if fd is already initialized */
+ if (se->vu_listen_fd >= 0) {
+ return 0;
+ }
+
if (strlen(se->vu_socket_path) >= sizeof(un.sun_path)) {
fuse_log(FUSE_LOG_ERR, "Socket path too long\n");
return -1;
}
- se->fd = -1;
-
/*
* Create the Unix socket to communicate with qemu
* based on QEMU's vhost-user-bridge
@@ -682,15 +685,31 @@ int virtio_session_mount(struct fuse_session *se)
return -1;
}
+ se->vu_listen_fd = listen_sock;
+ return 0;
+}
+
+int virtio_session_mount(struct fuse_session *se)
+{
+ int ret;
+
+ ret = fv_create_listen_socket(se);
+ if (ret < 0) {
+ return ret;
+ }
+
+ se->fd = -1;
+
fuse_log(FUSE_LOG_INFO, "%s: Waiting for vhost-user socket connection...\n",
__func__);
- int data_sock = accept(listen_sock, NULL, NULL);
+ int data_sock = accept(se->vu_listen_fd, NULL, NULL);
if (data_sock == -1) {
fuse_log(FUSE_LOG_ERR, "vhost socket accept: %m\n");
- close(listen_sock);
+ close(se->vu_listen_fd);
return -1;
}
- close(listen_sock);
+ close(se->vu_listen_fd);
+ se->vu_listen_fd = -1;
fuse_log(FUSE_LOG_INFO, "%s: Received vhost-user socket connection\n",
__func__);
--
1.8.3.1