What's wrong with msdosfs ?

[Enache Adrian]

# mount -o rw -t msdosfs /dev/ad0s5 /D
# echo > /D/foo
/D/foo: Operation not permitted.
# umount /D
umount: unmount of /D failed: Resource temporarily unavailable
# Apr 24 20:46:11 ratsnest kernel: fsync: giving up on dirty: 0xc1e435b4: tag devfs, type VCHR, usecount 3, writecount 0, refcount 1210, lock type devfs: EXCL (count 1) by thread 0xc1871980
Apr 24 20:46:11 ratsnest kernel: dev ad0s5

Then I have to do:

# mount -uo ro /D
# umount /D

Why do I get EPERM there ?

That's a 1 week old -CURRENT and ad0s5 is a Win98 vfat partition.
I always used it r/w without problems from FreeBSD.

Thanks & Regards
Adi