Whenever file is created, the vnode_create_vobject() function will
try to determine its size by calling vn_getsize_locked() as size 0
is ambigious: it means either the file size is 0 or the file size
is unknown.
Introduce special value for the size argument: VNODE_NO_SIZE.
Only when it is given, the vnode_create_vobject() will try to obtain
file's size on its own.
Introduce dedicated vnode_disk_create_vobject() for use by
g_vfs_open(), so we don't have to call vn_isdisk() in the common case
(for regular files).
Handle the case of mediasize==0 in g_vfs_open().
Reviewed by: alc, kib, markj, olce
Approved by: oshogbo (mentor), allanjude (mentor)
Differential Revision: https://reviews.freebsd.org/D45244
56a8aca83a