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This ghetto patch attempts to fix shared folder automounting for guests running
Linux 4.16, and also suggests an alternative to mount.vboxsf.
diff -uprb VirtualBox-5.2.8.orig/src/VBox/Additions/common/VBoxService/VBoxServiceAutoMount.cpp VirtualBox-5.2.8/src/VBox/Additions/common/VBoxService/VBoxServiceAutoMount.cpp
--- VirtualBox-5.2.8.orig/src/VBox/Additions/common/VBoxService/VBoxServiceAutoMount.cpp 2018-02-26 17:57:30.000000000 +0200
+++ VirtualBox-5.2.8/src/VBox/Additions/common/VBoxService/VBoxServiceAutoMount.cpp 2018-04-07 21:00:05.785735622 +0300
@@ -346,6 +346,13 @@ static int vbsvcAutoMountSharedFolder(co
"vboxsf",
fFlags,
&mntinf);
+ if (r == -1 && errno == EINVAL)
+ {
+ /* Mainline vboxsf accepts regular mount opts. */
+ char mount_opts[1024];
+ snprintf(mount_opts, 1024, "gid=%d,dmode=0770,fmode=0770", mntinf.gid);
+ r = mount(pszShareName, pszMountPoint, "vboxsf", fFlags, mount_opts);
+ }
if (r == 0)
{
VGSvcVerbose(0, "vbsvcAutoMountWorker: Shared folder '%s' was mounted to '%s'\n", pszShareName, pszMountPoint);
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