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/zio_checksum.h b/include/sys/zio_checksum.h
new file mode 100644
index 000000000..0956c04ab
--- /dev/null
+++ b/include/sys/zio_checksum.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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#ifndef _SYS_ZIO_CHECKSUM_H
+#define	_SYS_ZIO_CHECKSUM_H
+
+#include <sys/zio.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * Signature for checksum functions.
+ */
+typedef void zio_checksum_t(const void *data, uint64_t size, zio_cksum_t *zcp);
+
+/*
+ * Information about each checksum function.
+ */
+typedef struct zio_checksum_info {
+	zio_checksum_t	*ci_func[2]; /* checksum function for each byteorder */
+	int		ci_correctable;	/* number of correctable bits	*/
+	int		ci_eck;		/* uses zio embedded checksum? */
+	int		ci_dedup;	/* strong enough for dedup? */
+	char		*ci_name;	/* descriptive name */
+} zio_checksum_info_t;
+
+typedef struct zio_bad_cksum {
+	zio_cksum_t		zbc_expected;
+	zio_cksum_t		zbc_actual;
+	const char		*zbc_checksum_name;
+	uint8_t			zbc_byteswapped;
+	uint8_t			zbc_injected;
+	uint8_t			zbc_has_cksum;	/* expected/actual valid */
+} zio_bad_cksum_t;
+
+extern zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS];
+
+/*
+ * Checksum routines.
+ */
+extern zio_checksum_t zio_checksum_SHA256;
+
+extern void zio_checksum_compute(zio_t *zio, enum zio_checksum checksum,
+    void *data, uint64_t size);
+extern int zio_checksum_error(zio_t *zio, zio_bad_cksum_t *out);
+extern enum zio_checksum spa_dedup_checksum(spa_t *spa);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _SYS_ZIO_CHECKSUM_H */