Make weed-fuse compatible with systemd-based mount (#6814)

* Make weed-fuse compatible with systemd-mount series

* fix: add missing type annotation on skipAutofs param in FreeBSD build

The parameter was declared without a type, causing a compile error on FreeBSD.

* fix: guard hasAutofs nil dereference and make FsName conditional on autofs mode

- Check option.hasAutofs for nil before dereferencing to prevent panic
  when RunMount is called without the flag initialized.
- Only set FsName to "fuse" when autofs mode is active; otherwise
  preserve the descriptive server:path name for mount/df output.
- Fix typo: recogize -> recognize.

* fix: consistent error handling for autofs option and log ignored _netdev

- Replace panic with fmt.Fprintf+return false for autofs parse errors,
  matching the pattern used by other fuse option parsers.
- Log when _netdev option is silently stripped to aid debugging.

---------

Co-authored-by: Chris Lu <chris.lu@gmail.com>

weed/command/mount_std.go

@@ -223,13 +223,21 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 	}
 
 	// Ensure target mount point availability
-	if isValid := checkMountPointAvailable(dir); !isValid {
+	skipAutofs := option.hasAutofs != nil && *option.hasAutofs
+	if isValid := checkMountPointAvailable(dir, skipAutofs); !isValid {
 		glog.Fatalf("Target mount point is not available: %s, please check!", dir)
 		return true
 	}
 
 	serverFriendlyName := strings.ReplaceAll(*option.filer, ",", "+")
 
+	// When autofs/systemd-mount is used, FsName must be "fuse" so util-linux/mount can recognize
+	// it as a pseudo filesystem. Otherwise, preserve the descriptive name for mount/df output.
+	fsName := serverFriendlyName + ":" + filerMountRootPath
+	if skipAutofs {
+		fsName = "fuse"
+	}
+
 	// mount fuse
 	fuseMountOptions := &fuse.MountOptions{
 		AllowOther:               *option.allowOthers,
@@ -239,7 +247,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		MaxReadAhead:             1024 * 1024 * 2,
 		IgnoreSecurityLabels:     false,
 		RememberInodes:           false,
-		FsName:                   serverFriendlyName + ":" + filerMountRootPath,
+		FsName:                   fsName,
 		Name:                     "seaweedfs",
 		SingleThreaded:           false,
 		DisableXAttrs:            *option.disableXAttr,