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, 12 insertions, 4 deletions

diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_rlock.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_rlock.c
index 07ec0f6..f0a75b5 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_rlock.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_rlock.c
@@ -472,10 +472,14 @@ zfs_range_unlock_reader(znode_t *zp, rl_t *remove)
 	 */
 	if (remove->r_cnt == 1) {
 		avl_remove(tree, remove);
-		if (remove->r_write_wanted)
+		if (remove->r_write_wanted) {
 			cv_broadcast(&remove->r_wr_cv);
-		if (remove->r_read_wanted)
+			cv_destroy(&remove->r_wr_cv);
+		}
+		if (remove->r_read_wanted) {
 			cv_broadcast(&remove->r_rd_cv);
+			cv_destroy(&remove->r_rd_cv);
+		}
 	} else {
 		ASSERT3U(remove->r_cnt, ==, 0);
 		ASSERT3U(remove->r_write_wanted, ==, 0);
@@ -501,10 +505,14 @@ zfs_range_unlock_reader(znode_t *zp, rl_t *remove)
 			rl->r_cnt--;
 			if (rl->r_cnt == 0) {
 				avl_remove(tree, rl);
-				if (rl->r_write_wanted)
+				if (rl->r_write_wanted) {
 					cv_broadcast(&rl->r_wr_cv);
-				if (rl->r_read_wanted)
+					cv_destroy(&rl->r_wr_cv);
+				}
+				if (rl->r_read_wanted) {
 					cv_broadcast(&rl->r_rd_cv);
+					cv_destroy(&rl->r_rd_cv);
+				}
 				kmem_free(rl, sizeof (rl_t));
 			}
 		}