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, 17 insertions, 10 deletions

diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c
index 23313a9..8fdfa62 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c
@@ -19,7 +19,7 @@
  * CDDL HEADER END
  */
 /*
- * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
@@ -300,6 +300,7 @@ space_map_load(space_map_t *sm, space_map_ops_t *ops, uint8_t maptype,
 	uint64_t *entry, *entry_map, *entry_map_end;
 	uint64_t bufsize, size, offset, end, space;
 	uint64_t mapstart = sm->sm_start;
+	int error = 0;
 
 	ASSERT(MUTEX_HELD(sm->sm_lock));
 
@@ -337,9 +338,10 @@ space_map_load(space_map_t *sm, space_map_ops_t *ops, uint8_t maptype,
 		    smo->smo_object, offset, size);
 
 		mutex_exit(sm->sm_lock);
-		VERIFY3U(dmu_read(os, smo->smo_object, offset, size,
-		    entry_map), ==, 0);
+		error = dmu_read(os, smo->smo_object, offset, size, entry_map);
 		mutex_enter(sm->sm_lock);
+		if (error != 0)
+			break;
 
 		entry_map_end = entry_map + (size / sizeof (uint64_t));
 		for (entry = entry_map; entry < entry_map_end; entry++) {
@@ -354,20 +356,25 @@ space_map_load(space_map_t *sm, space_map_ops_t *ops, uint8_t maptype,
 			    SM_RUN_DECODE(e) << sm->sm_shift);
 		}
 	}
-	VERIFY3U(sm->sm_space, ==, space);
+
+	if (error == 0) {
+		VERIFY3U(sm->sm_space, ==, space);
+
+		sm->sm_loaded = B_TRUE;
+		sm->sm_ops = ops;
+		if (ops != NULL)
+			ops->smop_load(sm);
+	} else {
+		space_map_vacate(sm, NULL, NULL);
+	}
 
 	zio_buf_free(entry_map, bufsize);
 
 	sm->sm_loading = B_FALSE;
-	sm->sm_loaded = B_TRUE;
-	sm->sm_ops = ops;
 
 	cv_broadcast(&sm->sm_load_cv);
 
-	if (ops != NULL)
-		ops->smop_load(sm);
-
-	return (0);
+	return (error);
 }
 
 void