5045 use atomic_{inc,dec}_* instead of atomic_add_*
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Approved by: Robert Mustacchi <rm@joyent.com>

PSARC 2010/144 lofi(7D) in non global zones
6354954 lofi support in non-global zones
6942891 prof_lookup_globaldev() leaks rootdir refs
6945005 lofiadm -a /dev/lofi/1: recursive mutex enter
6946486 l

PSARC 2010/144 lofi(7D) in non global zones
6354954 lofi support in non-global zones
6942891 prof_lookup_globaldev() leaks rootdir refs
6945005 lofiadm -a /dev/lofi/1: recursive mutex enter
6946486 lofi_ioctl() shouldn't allow disk ioctl()s on /dev/lofictl

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6563073 Fix cstyle in the sharefs code
6575901 libc`sharefs() and ld.so have conspired to kill smdiskless

PSARC/2007/052 In-kernel Sharetab
6371468 /etc/dfs/sharetab should be a mntfs style file