From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Mon, 27 Jan 2020 19:00:46 +0000
Subject: [PATCH] virtiofsd: remove mountpoint dummy argument
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Classic FUSE file system daemons take a mountpoint argument but
virtiofsd exposes a vhost-user UNIX domain socket instead.  The
mountpoint argument is not used by virtiofsd but the user is still
required to pass a dummy argument on the command-line.

Remove the mountpoint argument to clean up the command-line.

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 67aab02272f6cb47c56420f60b370c184961b5ca)
---
 tools/virtiofsd/fuse_lowlevel.c  |  2 +-
 tools/virtiofsd/fuse_lowlevel.h  |  4 +---
 tools/virtiofsd/helper.c         | 20 +++-----------------
 tools/virtiofsd/passthrough_ll.c | 12 ++----------
 4 files changed, 7 insertions(+), 31 deletions(-)

diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
index 5c9cb52f2a..2f32c68161 100644
--- a/tools/virtiofsd/fuse_lowlevel.c
+++ b/tools/virtiofsd/fuse_lowlevel.c
@@ -2455,7 +2455,7 @@ out1:
     return NULL;
 }
 
-int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
+int fuse_session_mount(struct fuse_session *se)
 {
     int fd;
 
diff --git a/tools/virtiofsd/fuse_lowlevel.h b/tools/virtiofsd/fuse_lowlevel.h
index adb9054bb1..8d8909b35d 100644
--- a/tools/virtiofsd/fuse_lowlevel.h
+++ b/tools/virtiofsd/fuse_lowlevel.h
@@ -1863,7 +1863,6 @@ struct fuse_cmdline_opts {
     int foreground;
     int debug;
     int nodefault_subtype;
-    char *mountpoint;
     int show_version;
     int show_help;
     unsigned int max_idle_threads;
@@ -1924,12 +1923,11 @@ struct fuse_session *fuse_session_new(struct fuse_args *args,
 /**
  * Mount a FUSE file system.
  *
- * @param mountpoint the mount point path
  * @param se session object
  *
  * @return 0 on success, -1 on failure.
  **/
-int fuse_session_mount(struct fuse_session *se, const char *mountpoint);
+int fuse_session_mount(struct fuse_session *se);
 
 /**
  * Enter a single threaded, blocking event loop.
diff --git a/tools/virtiofsd/helper.c b/tools/virtiofsd/helper.c
index 5711dd2660..5e6f2051a7 100644
--- a/tools/virtiofsd/helper.c
+++ b/tools/virtiofsd/helper.c
@@ -140,27 +140,13 @@ void fuse_cmdline_help(void)
 static int fuse_helper_opt_proc(void *data, const char *arg, int key,
                                 struct fuse_args *outargs)
 {
+    (void)data;
     (void)outargs;
-    struct fuse_cmdline_opts *opts = data;
 
     switch (key) {
     case FUSE_OPT_KEY_NONOPT:
-        if (!opts->mountpoint) {
-            if (fuse_mnt_parse_fuse_fd(arg) != -1) {
-                return fuse_opt_add_opt(&opts->mountpoint, arg);
-            }
-
-            char mountpoint[PATH_MAX] = "";
-            if (realpath(arg, mountpoint) == NULL) {
-                fuse_log(FUSE_LOG_ERR, "fuse: bad mount point `%s': %s\n", arg,
-                         strerror(errno));
-                return -1;
-            }
-            return fuse_opt_add_opt(&opts->mountpoint, mountpoint);
-        } else {
-            fuse_log(FUSE_LOG_ERR, "fuse: invalid argument `%s'\n", arg);
-            return -1;
-        }
+        fuse_log(FUSE_LOG_ERR, "fuse: invalid argument `%s'\n", arg);
+        return -1;
 
     default:
         /* Pass through unknown options */
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index c5850ef803..9377718d9d 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -1297,7 +1297,7 @@ int main(int argc, char *argv[])
         return 1;
     }
     if (opts.show_help) {
-        printf("usage: %s [options] <mountpoint>\n\n", argv[0]);
+        printf("usage: %s [options]\n\n", argv[0]);
         fuse_cmdline_help();
         fuse_lowlevel_help();
         ret = 0;
@@ -1308,13 +1308,6 @@ int main(int argc, char *argv[])
         goto err_out1;
     }
 
-    if (opts.mountpoint == NULL) {
-        printf("usage: %s [options] <mountpoint>\n", argv[0]);
-        printf("       %s --help\n", argv[0]);
-        ret = 1;
-        goto err_out1;
-    }
-
     if (fuse_opt_parse(&args, &lo, lo_opts, NULL) == -1) {
         return 1;
     }
@@ -1374,7 +1367,7 @@ int main(int argc, char *argv[])
         goto err_out2;
     }
 
-    if (fuse_session_mount(se, opts.mountpoint) != 0) {
+    if (fuse_session_mount(se) != 0) {
         goto err_out3;
     }
 
@@ -1393,7 +1386,6 @@ err_out3:
 err_out2:
     fuse_session_destroy(se);
 err_out1:
-    free(opts.mountpoint);
     fuse_opt_free_args(&args);
 
     if (lo.root.fd >= 0) {