* return EROFS for volume mounted RO when the nameiop is DELETE or RENAME
(the same way ufs_lookup() does)
* add explicit call to cache_lookup() on NetBSD (handled by generic VFS
layer in FreeBSD)
* avoid using strncmp() when checking whether the name is . or ..
* fix locking of parent directory for ISDOTDOT case
* call cache_enter() always (even for . and ..)
* vnodeops array: add entry for vop_fcntl_desc, remove unnecessary casts
Reviewed by: wrstuden
Tested by: jdolecek
worth of data under NetBSD -- FreeBSD bread() seems to be able to
return more data and code counted with it
it's possible to actually mount NTFS volume now