OpenSolaris

This is very similar to bug 6285758 but that is claimed to be fixed om snv_18

Attempting to rename a zfs filesystem that is both busy and has children leads to the children being unmounted. Here is a test case:

v4u-880m-gmp03 69 # zfs create tank/one
v4u-880m-gmp03 70 # zfs create tank/two
v4u-880m-gmp03 71 # zfs create tank/two/three
v4u-880m-gmp03 72 # cd /tank/two
v4u-880m-gmp03 73 # touch three/four.file
v4u-880m-gmp03 74 # ls -l  three/four.file
-rw-r--r--   1 root     root           0 May 21 22:52 three/four.file
v4u-880m-gmp03 75 # zfs rename tank/two tank/one/two
cannot unmount '/tank/two': Device busy
v4u-880m-gmp03 76 # ls -l three
total 0
v4u-880m-gmp03 77 # df -h three
Filesystem             size   used  avail capacity  Mounted on
tank/two               134G    25K   134G     1%    /tank/two
v4u-880m-gmp03 78 # zfs mount -a
v4u-880m-gmp03 79 # df -h three
Filesystem             size   used  avail capacity  Mounted on
tank/two/three         134G    24K   134G     1%    /tank/two/three
v4u-880m-gmp03 80 #

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