K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2016-05-16T15:28:39.134583Z
K 7
svn:log
V 642
fix locking in zfsctl_root_lookup

Dropping the root vnode's lock after VFS_ROOT() didn't really help the
fact that we acquired the lock while holding its child's, .zfs, lock
while performing the operaiton.
So, directly use zfs_zget() to get the root vnode.

While there simplify the code in zfsctl_freebsd_root_lookup.
We know that .zfs is always exclusively locked.
We know that there is already a reference on *vpp, so no need for an
extra one.
Account for the fact that .. lookup may ask for a different lock type,
not necessarily LK_EXCLUSIVE.  And handle a possible failure to acquire
the lock given the lock flags.

MFC after:	5 weeks

END