A few fixes from Pedro Martelletto, adapted from

https://github.com/bitrig/bitrig/commits/pedro_tmpfs_fixes

7efd381ac3:

# mkdir -p x/y
# mv x/y/. z (or mv x/y/.. z)
(panic)

264ecd2c7b:

# mknod x b 100 100 (can be any block/character device)
# ls -lR /
(panic)

7da08d22fd:

# mkfifo x (or mknod x)
# mv x y
(panic)

af0666c65a:

# mount -t tmpfs -o -n16 tmpfs /mnt (create tmpfs with 16 inodes limit)
# cd /mnt
# touch x
# for i in `jot 100 1 100`; do ln -s x $i; done (create 100 symlinks, =
they "succeed" even though they failed)
# ls -lart

7e9296a6f8:

# mkdir x
# touch x/y
# chflags uappnd x (or sappnd)
# rm x/y

936b9cf257:

# mkdir -p x/y
# rmdir x/y/..
(panic)

de541406ef:

# touch x
# ln x y
# stat -f %c x
# sleep 10
# rm y
# stat -f %c x

okay guenther@, krw@

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