Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes.

This bring huge amount of changes, I'll enumerate only user-visible changes:

- Delegated Administration

	Allows regular users to perform ZFS operations, like file system
	creation, snapshot creation, etc.

- L2ARC

	Level 2 cache for ZFS - allows to use additional disks for cache.
	Huge performance improvements mostly for random read of mostly
	static content.

- slog

	Allow to use additional disks for ZFS Intent Log to speed up
	operations like fsync(2).

- vfs.zfs.super_owner

	Allows regular users to perform privileged operations on files stored
	on ZFS file systems owned by him. Very careful with this one.

- chflags(2)

	Not all the flags are supported. This still needs work.

- ZFSBoot

	Support to boot off of ZFS pool. Not finished, AFAIK.

	Submitted by:	dfr

- Snapshot properties

- New failure modes

	Before if write requested failed, system paniced. Now one
	can select from one of three failure modes:
	- panic - panic on write error
	- wait - wait for disk to reappear
	- continue - serve read requests if possible, block write requests

- Refquota, refreservation properties

	Just quota and reservation properties, but don't count space consumed
	by children file systems, clones and snapshots.

- Sparse volumes

	ZVOLs that don't reserve space in the pool.

- External attributes

	Compatible with extattr(2).

- NFSv4-ACLs

	Not sure about the status, might not be complete yet.

	Submitted by:	trasz

- Creation-time properties

- Regression tests for zpool(8) command.

Obtained from:	OpenSolaris

1 files changed, 9 insertions, 0 deletions

diff --git a/sys/cddl/compat/opensolaris/sys/atomic.h b/sys/cddl/compat/opensolaris/sys/atomic.h
index 46752a58995d..1a8bd45964d7 100644
--- a/sys/cddl/compat/opensolaris/sys/atomic.h
+++ b/sys/cddl/compat/opensolaris/sys/atomic.h
@@ -38,6 +38,7 @@
 
 #ifndef __LP64__
 extern void atomic_add_64(volatile uint64_t *target, int64_t delta);
+extern void atomic_dec_64(volatile uint64_t *target);
 extern void *atomic_cas_ptr(volatile void *target, void *cmp,  void *newval);
 #endif
 #ifndef __sparc64__
@@ -83,6 +84,14 @@ atomic_dec_32_nv(volatile uint32_t *target)
 	return (atomic_fetchadd_32(target, -1) - 1);
 }
 
+#ifdef __LP64__
+static __inline void
+atomic_dec_64(volatile uint64_t *target)
+{
+	atomic_subtract_64(target, 1);
+}
+#endif
+
 static __inline void
 atomic_inc_32(volatile uint32_t *target)
 {