fs: introduce two little fs{u,g}id inode initialization helpers

As Vivek pointed out we could tweak the names of the fs{u,g}id helpers.
That's already good but the better approach is to not expose them in
this way to filesystems at all and simply give the filesystems two
helpers inode_fsuid_set() and inode_fsgid_set() that will do the right

Inspired-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
4 files changed