Support custom build directories and move includes

One of the neat tricks an autoconf style project is capable of
is allow configurion/building in a directory other than the
source directory.  The major advantage to this is that you can
build the project various different ways while making changes
in a single source tree.

For example, this project is designed to work on various different
Linux distributions each of which work slightly differently.  This
means that changes need to verified on each of those supported
distributions perferably before the change is committed to the
public git repo.

Using nfs and custom build directories makes this much easier.
I now have a single source tree in nfs mounted on several different
systems each running a supported distribution.  When I make a
change to the source base I suspect may break things I can
concurrently build from the same source on all the systems each
in their own subdirectory.

wget -c http://github.com/downloads/behlendorf/zfs/zfs-x.y.z.tar.gz
tar -xzf zfs-x.y.z.tar.gz
cd zfs-x-y-z

------------------------- run concurrently ----------------------
<ubuntu system>  <fedora system>  <debian system>  <rhel6 system>
mkdir ubuntu     mkdir fedora     mkdir debian     mkdir rhel6
cd ubuntu        cd fedora        cd debian        cd rhel6
../configure     ../configure     ../configure     ../configure
make             make             make             make
make check       make check       make check       make check

This change also moves many of the include headers from individual
incude/sys directories under the modules directory in to a single
top level include directory.  This has the advantage of making
the build rules cleaner and logically it makes a bit more sense.

1 files changed, 89 insertions, 0 deletions

diff --git a/include/sys/metaslab_impl.h b/include/sys/metaslab_impl.h
new file mode 100644
index 000000000..07988dd51
--- /dev/null
+++ b/include/sys/metaslab_impl.h
@@ -0,0 +1,89 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * 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.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_METASLAB_IMPL_H
+#define	_SYS_METASLAB_IMPL_H
+
+#include <sys/metaslab.h>
+#include <sys/space_map.h>
+#include <sys/vdev.h>
+#include <sys/txg.h>
+#include <sys/avl.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+struct metaslab_class {
+	spa_t			*mc_spa;
+	metaslab_group_t	*mc_rotor;
+	space_map_ops_t		*mc_ops;
+	uint64_t		mc_aliquot;
+	uint64_t		mc_alloc;	/* total allocated space */
+	uint64_t		mc_deferred;	/* total deferred frees */
+	uint64_t		mc_space;	/* total space (alloc + free) */
+	uint64_t		mc_dspace;	/* total deflated space */
+};
+
+struct metaslab_group {
+	kmutex_t		mg_lock;
+	avl_tree_t		mg_metaslab_tree;
+	uint64_t		mg_aliquot;
+	uint64_t		mg_bonus_area;
+	int64_t			mg_bias;
+	int64_t			mg_activation_count;
+	metaslab_class_t	*mg_class;
+	vdev_t			*mg_vd;
+	metaslab_group_t	*mg_prev;
+	metaslab_group_t	*mg_next;
+};
+
+/*
+ * Each metaslab's free space is tracked in space map object in the MOS,
+ * which is only updated in syncing context.  Each time we sync a txg,
+ * we append the allocs and frees from that txg to the space map object.
+ * When the txg is done syncing, metaslab_sync_done() updates ms_smo
+ * to ms_smo_syncing.  Everything in ms_smo is always safe to allocate.
+ */
+struct metaslab {
+	kmutex_t	ms_lock;	/* metaslab lock		*/
+	space_map_obj_t	ms_smo;		/* synced space map object	*/
+	space_map_obj_t	ms_smo_syncing;	/* syncing space map object	*/
+	space_map_t	ms_allocmap[TXG_SIZE];  /* allocated this txg	*/
+	space_map_t	ms_freemap[TXG_SIZE];	/* freed this txg	*/
+	space_map_t	ms_defermap[TXG_DEFER_SIZE]; /* deferred frees	*/
+	space_map_t	ms_map;		/* in-core free space map	*/
+	int64_t		ms_deferspace;	/* sum of ms_defermap[] space	*/
+	uint64_t	ms_weight;	/* weight vs. others in group	*/
+	metaslab_group_t *ms_group;	/* metaslab group		*/
+	avl_node_t	ms_group_node;	/* node in metaslab group tree	*/
+	txg_node_t	ms_txg_node;	/* per-txg dirty metaslab links	*/
+};
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _SYS_METASLAB_IMPL_H */