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[PATCH 027/104] virtiofsd: add --fd=FDNUM fd passing option
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[PATCH 027/104] virtiofsd: add --fd=FDNUM fd passing option |
Date: |
Thu, 12 Dec 2019 16:37:47 +0000 |
From: Stefan Hajnoczi <address@hidden>
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 <address@hidden>
---
tools/virtiofsd/fuse_i.h | 1 +
tools/virtiofsd/fuse_lowlevel.c | 14 +++++++++---
tools/virtiofsd/fuse_virtio.c | 39 ++++++++++++++++++++++++---------
3 files changed, 41 insertions(+), 13 deletions(-)
diff --git a/tools/virtiofsd/fuse_i.h b/tools/virtiofsd/fuse_i.h
index 3d9a39cc1a..cb1ca70ffa 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 5f80625652..bea092b454 100644
--- a/tools/virtiofsd/fuse_lowlevel.c
+++ b/tools/virtiofsd/fuse_lowlevel.c
@@ -2134,6 +2134,7 @@ static const struct fuse_opt fuse_ll_opts[] = {
LL_OPTION("allow_root", deny_others, 1),
LL_OPTION("--socket-path=%s", vu_socket_path, 0),
LL_OPTION("vhost_user_socket=%s", vu_socket_path, 0),
+ LL_OPTION("--fd=%d", vu_listen_fd, 0),
FUSE_OPT_END
};
@@ -2154,6 +2155,7 @@ void fuse_lowlevel_help(void)
" -o allow_root allow access by root\n"
" --socket-path=PATH path for the vhost-user socket\n"
" -o vhost_user_socket=PATH path for the vhost-user socket\n"
+ " --fd=FDNUM fd number of vhost-user socket\n"
" -o auto_unmount auto unmount on process
termination\n");
}
@@ -2198,6 +2200,7 @@ 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;
@@ -2233,8 +2236,13 @@ 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;
}
@@ -2274,7 +2282,7 @@ 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 146cd3f702..fa6e53e7d0 100644
--- a/tools/virtiofsd/fuse_virtio.c
+++ b/tools/virtiofsd/fuse_virtio.c
@@ -636,22 +636,21 @@ 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;
}
- /*
- * Poison the fuse FD so we spot if we accidentally use it;
- * DO NOT check for this value, check for fuse_lowlevel_is_virtio()
- */
- se->fd = 0xdaff0d11;
-
/*
* Create the Unix socket to communicate with qemu
* based on QEMU's vhost-user-bridge
@@ -684,15 +683,35 @@ 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;
+ }
+
+ /*
+ * Poison the fuse FD so we spot if we accidentally use it;
+ * DO NOT check for this value, check fuse_lowlevel_is_virtio()
+ */
+ se->fd = 0xdaff0d11;
+
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__);
--
2.23.0
- [PATCH 019/104] virtiofsd: get/set features callbacks, (continued)
- [PATCH 019/104] virtiofsd: get/set features callbacks, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 018/104] virtiofsd: Add main virtio loop, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 021/104] virtiofsd: Poll kick_fd for queue, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 020/104] virtiofsd: Start queue threads, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 007/104] virtiofsd: Format imported files to qemu style, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 025/104] virtiofsd: Add Makefile wiring for virtiofsd contrib, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 024/104] virtiofsd: Keep track of replies, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 026/104] virtiofsd: Fast path for virtio read, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 027/104] virtiofsd: add --fd=FDNUM fd passing option,
Dr. David Alan Gilbert (git) <=
- [PATCH 022/104] virtiofsd: Start reading commands from queue, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 023/104] virtiofsd: Send replies to messages, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 030/104] virtiofsd: add --print-capabilities option, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 031/104] virtiofs: Add maintainers entry, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 028/104] virtiofsd: make -f (foreground) the default, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 029/104] virtiofsd: add vhost-user.json file, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 032/104] virtiofsd: passthrough_ll: create new files in caller's context, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 033/104] virtiofsd: passthrough_ll: add lo_map for ino/fh indirection, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 034/104] virtiofsd: passthrough_ll: add ino_map to hide lo_inode pointers, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 036/104] virtiofsd: passthrough_ll: add fd_map to hide file descriptors, Dr. David Alan Gilbert (git), 2019/12/12