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, 75 insertions, 0 deletions

diff --git a/include/sys/txg_impl.h b/include/sys/txg_impl.h
new file mode 100644
index 000000000..7b356eac1
--- /dev/null
+++ b/include/sys/txg_impl.h
@@ -0,0 +1,75 @@
+/*
+ * 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_TXG_IMPL_H
+#define	_SYS_TXG_IMPL_H
+
+#include <sys/spa.h>
+#include <sys/txg.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+struct tx_cpu {
+	kmutex_t	tc_lock;
+	kcondvar_t	tc_cv[TXG_SIZE];
+	uint64_t	tc_count[TXG_SIZE];
+	list_t		tc_callbacks[TXG_SIZE]; /* commit cb list */
+	char		tc_pad[16];
+};
+
+typedef struct tx_state {
+	tx_cpu_t	*tx_cpu;	/* protects right to enter txg	*/
+	kmutex_t	tx_sync_lock;	/* protects tx_state_t */
+	uint64_t	tx_open_txg;	/* currently open txg id */
+	uint64_t	tx_quiesced_txg; /* quiesced txg waiting for sync */
+	uint64_t	tx_syncing_txg;	/* currently syncing txg id */
+	uint64_t	tx_synced_txg;	/* last synced txg id */
+
+	uint64_t	tx_sync_txg_waiting; /* txg we're waiting to sync */
+	uint64_t	tx_quiesce_txg_waiting; /* txg we're waiting to open */
+
+	kcondvar_t	tx_sync_more_cv;
+	kcondvar_t	tx_sync_done_cv;
+	kcondvar_t	tx_quiesce_more_cv;
+	kcondvar_t	tx_quiesce_done_cv;
+	kcondvar_t	tx_timeout_cv;
+	kcondvar_t	tx_exit_cv;	/* wait for all threads to exit */
+
+	uint8_t		tx_threads;	/* number of threads */
+	uint8_t		tx_exiting;	/* set when we're exiting */
+
+	kthread_t	*tx_sync_thread;
+	kthread_t	*tx_quiesce_thread;
+
+	taskq_t		*tx_commit_cb_taskq; /* commit callback taskq */
+} tx_state_t;
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _SYS_TXG_IMPL_H */