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, 142 insertions, 0 deletions

diff --git a/include/sys/arc.h b/include/sys/arc.h
new file mode 100644
index 000000000..8f189c62d
--- /dev/null
+++ b/include/sys/arc.h
@@ -0,0 +1,142 @@
+/*
+ * 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_ARC_H
+#define	_SYS_ARC_H
+
+#include <sys/zfs_context.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#include <sys/zio.h>
+#include <sys/dmu.h>
+#include <sys/spa.h>
+
+typedef struct arc_buf_hdr arc_buf_hdr_t;
+typedef struct arc_buf arc_buf_t;
+typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
+typedef int arc_evict_func_t(void *private);
+
+/* generic arc_done_func_t's which you can use */
+arc_done_func_t arc_bcopy_func;
+arc_done_func_t arc_getbuf_func;
+
+struct arc_buf {
+	arc_buf_hdr_t		*b_hdr;
+	arc_buf_t		*b_next;
+	kmutex_t		b_evict_lock;
+	krwlock_t		b_data_lock;
+	void			*b_data;
+	arc_evict_func_t	*b_efunc;
+	void			*b_private;
+};
+
+typedef enum arc_buf_contents {
+	ARC_BUFC_DATA,				/* buffer contains data */
+	ARC_BUFC_METADATA,			/* buffer contains metadata */
+	ARC_BUFC_NUMTYPES
+} arc_buf_contents_t;
+/*
+ * These are the flags we pass into calls to the arc
+ */
+#define	ARC_WAIT	(1 << 1)	/* perform I/O synchronously */
+#define	ARC_NOWAIT	(1 << 2)	/* perform I/O asynchronously */
+#define	ARC_PREFETCH	(1 << 3)	/* I/O is a prefetch */
+#define	ARC_CACHED	(1 << 4)	/* I/O was already in cache */
+#define	ARC_L2CACHE	(1 << 5)	/* cache in L2ARC */
+
+/*
+ * The following breakdows of arc_size exist for kstat only.
+ */
+typedef enum arc_space_type {
+	ARC_SPACE_DATA,
+	ARC_SPACE_HDRS,
+	ARC_SPACE_L2HDRS,
+	ARC_SPACE_OTHER,
+	ARC_SPACE_NUMTYPES
+} arc_space_type_t;
+
+void arc_space_consume(uint64_t space, arc_space_type_t type);
+void arc_space_return(uint64_t space, arc_space_type_t type);
+void *arc_data_buf_alloc(uint64_t space);
+void arc_data_buf_free(void *buf, uint64_t space);
+arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag,
+    arc_buf_contents_t type);
+arc_buf_t *arc_loan_buf(spa_t *spa, int size);
+void arc_return_buf(arc_buf_t *buf, void *tag);
+void arc_loan_inuse_buf(arc_buf_t *buf, void *tag);
+void arc_buf_add_ref(arc_buf_t *buf, void *tag);
+int arc_buf_remove_ref(arc_buf_t *buf, void *tag);
+int arc_buf_size(arc_buf_t *buf);
+void arc_release(arc_buf_t *buf, void *tag);
+int arc_release_bp(arc_buf_t *buf, void *tag, blkptr_t *bp, spa_t *spa,
+    zbookmark_t *zb);
+int arc_released(arc_buf_t *buf);
+int arc_has_callback(arc_buf_t *buf);
+void arc_buf_freeze(arc_buf_t *buf);
+void arc_buf_thaw(arc_buf_t *buf);
+#ifdef ZFS_DEBUG
+int arc_referenced(arc_buf_t *buf);
+#endif
+
+int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, arc_buf_t *pbuf,
+    arc_done_func_t *done, void *private, int priority, int zio_flags,
+    uint32_t *arc_flags, const zbookmark_t *zb);
+int arc_read_nolock(zio_t *pio, spa_t *spa, const blkptr_t *bp,
+    arc_done_func_t *done, void *private, int priority, int flags,
+    uint32_t *arc_flags, const zbookmark_t *zb);
+zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg,
+    blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, const zio_prop_t *zp,
+    arc_done_func_t *ready, arc_done_func_t *done, void *private,
+    int priority, int zio_flags, const zbookmark_t *zb);
+
+void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
+int arc_buf_evict(arc_buf_t *buf);
+
+void arc_flush(spa_t *spa);
+void arc_tempreserve_clear(uint64_t reserve);
+int arc_tempreserve_space(uint64_t reserve, uint64_t txg);
+
+void arc_init(void);
+void arc_fini(void);
+
+/*
+ * Level 2 ARC
+ */
+
+void l2arc_add_vdev(spa_t *spa, vdev_t *vd);
+void l2arc_remove_vdev(vdev_t *vd);
+boolean_t l2arc_vdev_present(vdev_t *vd);
+void l2arc_init(void);
+void l2arc_fini(void);
+void l2arc_start(void);
+void l2arc_stop(void);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _SYS_ARC_H */