routines - avoids potential DoS attack and closes an easy way to force
the kernel to panic
* for read(), DTRT WRT offset bigger than file size
ntfs_strategy(): adapt to ntfs_readattr() change
ntfs_readdir(): use ntfs_u28() to translate the file name characters
to 8bit encoding, avoid excessive intendation, reformat the
debug messages slightly
* 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
