Chris Dunlop f0da4d1508 Wait for all znodes to be released before tearing down the superblock
By the time we're tearing down our superblock the VFS has started releasing
all our inodes/znodes. Some of this work may have been handed off to our
iput taskq so we need to wait for that work to complete. However the iput
from the taskq can itself result in additional work being added to the
taskq:

dsl_pool_iput_taskq
 iput
  iput_final
   evict
    destroy_inode
     zpl_inode_destroy
      zfs_inode_destroy
       zfs_iput_async(ZTOI(zp->z_xattr_parent))
        taskq_dispatch(dsl_pool_iput_taskq..., iput, ...)

Let's wait until all our znodes have been released.

Signed-off-by: Chris Dunlop <chris@onthe.net.au>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3281
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Native ZFS for Linux!

ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.

ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.

Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org

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