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, 15 insertions, 5 deletions

diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/txg.h b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/txg.h
index dae129c..23bdff2 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/txg.h
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/txg.h
@@ -2,9 +2,8 @@
  * CDDL HEADER START
  *
  * The contents of this file are subject to the terms of the
- * Common Development and Distribution License, Version 1.0 only
- * (the "License").  You may not use this file except in compliance
- * with the License.
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
  *
  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  * or http://www.opensolaris.org/os/licensing.
@@ -20,7 +19,7 @@
  * CDDL HEADER END
  */
 /*
- * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
@@ -76,6 +75,14 @@ extern void txg_suspend(struct dsl_pool *dp);
 extern void txg_resume(struct dsl_pool *dp);
 
 /*
+ * Delay the caller by the specified number of ticks or until
+ * the txg closes (whichever comes first).  This is intended
+ * to be used to throttle writers when the system nears its
+ * capacity.
+ */
+extern void txg_delay(struct dsl_pool *dp, uint64_t txg, int ticks);
+
+/*
  * Wait until the given transaction group has finished syncing.
  * Try to make this happen as soon as possible (eg. kick off any
  * necessary syncs immediately).  If txg==0, wait for the currently open
@@ -95,7 +102,10 @@ extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg);
  * Returns TRUE if we are "backed up" waiting for the syncing
  * transaction to complete; otherwise returns FALSE.
  */
-extern int txg_stalled(struct dsl_pool *dp);
+extern boolean_t txg_stalled(struct dsl_pool *dp);
+
+/* returns TRUE if someone is waiting for the next txg to sync */
+extern boolean_t txg_sync_waiting(struct dsl_pool *dp);
 
 /*
  * Per-txg object lists.