[PATCH v12 resend 0/1] fs: Add VirtualBox guest shared folder (vboxsf)

[Hans de Goede <hdegoede@redhat.com>]

Hello Everyone,

Here is a resend of the 12th version of my cleaned-up / refactored version
of the VirtualBox shared-folder VFS driver. It seems that for some reason
only the cover letter of my initial-posting of v12 has made it to the list.

This version hopefully addresses all issues pointed out in David Howell's
review of v11 (thank you for the review David):

Changes in v12:
-Move make_kuid / make_kgid calls to option parsing time and add
 uid_valid / gid_valid checks.
-In init_fs_context call current_uid_gid() to init uid and gid
-Validate dmode, fmode, dmask and fmask options during option parsing
-Use correct types for various mount option variables (kuid_t, kgid_t, umode_t)
-Some small coding-style tweaks

For changes in older versions see the change log in the patch.

This version has been used by several distributions (arch, Fedora) for a
while now, so hopefully we can get this upstream soonish, please review.

Regards,

Hans