[PATCH v2 0/1] fs: Add VirtualBox guest shared folder (vboxsf) support

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

Hi All,

Now that the vboxguest driver which the vboxsf (guest shared folder)
fs driver depends on is queued for merging into 4.16 in char-misc-next,
all the dependencies for the vboxsf are in place.

So here is a v2 of my initial vboxsf, addressing all of the remark from
Christoph Hellwig about v1:
 -Removed various unused wrapper functions
 -Don't use i_private, instead defined alloc_inode and destroy_inode
  methods and use container_of.
 -Drop obsolete comment referencing people to
  http://www.atnf.csiro.au/people/rgooch/linux/vfs.txt
 -move the single symlink op of from lnkops.c to file.c

As well as bunch of other cleanups:
 -Use SPDX license headers
 -Replace SHFLROOT / SHFLHANDLE defines with normal types
 -Removed unnecessary S_ISREG checks
 -Got rid of bounce_buffer in regops, instead add a "user" flag to 
  vboxsf_read / vboxsf_write, re-using the existing __user address support
  in the vboxguest module
 -Make vboxsf_wrappers return regular linux errno values
 -Use i_size_write to update size on writing
 -Convert doxygen style comments to kerneldoc style comments

Please review.

Regards,

Hans