Update build system and packaging

Minimal changes required to integrate the SPL sources in to the
ZFS repository build infrastructure and packaging.

Build system and packaging:
  * Renamed SPL_* autoconf m4 macros to ZFS_*.
  * Removed redundant SPL_* autoconf m4 macros.
  * Updated the RPM spec files to remove SPL package dependency.
  * The zfs package obsoletes the spl package, and the zfs-kmod
    package obsoletes the spl-kmod package.
  * The zfs-kmod-devel* packages were updated to add compatibility
    symlinks under /usr/src/spl-x.y.z until all dependent packages
    can be updated.  They will be removed in a future release.
  * Updated copy-builtin script for in-kernel builds.
  * Updated DKMS package to include the spl.ko.
  * Updated stale AUTHORS file to include all contributors.
  * Updated stale COPYRIGHT and included the SPL as an exception.
  * Renamed README.markdown to README.md
  * Renamed OPENSOLARIS.LICENSE to LICENSE.
  * Renamed DISCLAIMER to NOTICE.

Required code changes:
  * Removed redundant HAVE_SPL macro.
  * Removed _BOOT from nvpairs since it doesn't apply for Linux.
  * Initial header cleanup (removal of empty headers, refactoring).
  * Remove SPL repository clone/build from zimport.sh.
  * Use of DEFINE_RATELIMIT_STATE and DEFINE_SPINLOCK removed due
    to build issues when forcing C99 compilation.
  * Replaced legacy ACCESS_ONCE with READ_ONCE.
  * Include needed headers for `current` and `EXPORT_SYMBOL`.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
TEST_ZIMPORT_SKIP="yes"
Closes #7556

include/sys/Makefile.am

@@ -42,6 +42,7 @@ COMMON_H = \
 	$(top_srcdir)/include/sys/mmp.h \
 	$(top_srcdir)/include/sys/mntent.h \
 	$(top_srcdir)/include/sys/multilist.h \
+	$(top_srcdir)/include/sys/note.h \
 	$(top_srcdir)/include/sys/nvpair.h \
 	$(top_srcdir)/include/sys/nvpair_impl.h \
 	$(top_srcdir)/include/sys/pathname.h \

include/sys/abd.h

@@ -27,7 +27,6 @@
 #define	_ABD_H
 
 #include <sys/isa_defs.h>
-#include <sys/int_types.h>
 #include <sys/debug.h>
 #include <sys/refcount.h>
 #ifdef _KERNEL
@@ -116,7 +115,7 @@ int abd_cmp(abd_t *, abd_t *);
 int abd_cmp_buf_off(abd_t *, const void *, size_t, size_t);
 void abd_zero_off(abd_t *, size_t, size_t);
 
-#if defined(_KERNEL) && defined(HAVE_SPL)
+#if defined(_KERNEL)
 unsigned int abd_scatter_bio_map_off(struct bio *, abd_t *, unsigned int,
 		size_t);
 unsigned long abd_nr_pages_off(abd_t *, unsigned int, size_t);

include/sys/fm/protocol.h

@@ -31,7 +31,6 @@ extern "C" {
 #endif
 
 #ifdef _KERNEL
-#include <sys/varargs.h>
 #include <sys/nvpair.h>
 #else
 #include <libnvpair.h>

include/sys/note.h

@@ -0,0 +1,56 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (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) 1994 by Sun Microsystems, Inc.
+ */
+
+/*
+ * sys/note.h:	interface for annotating source with info for tools
+ *
+ * This is the underlying interface; NOTE (/usr/include/note.h) is the
+ * preferred interface, but all exported header files should include this
+ * file directly and use _NOTE so as not to take "NOTE" from the user's
+ * namespace.  For consistency, *all* kernel source should use _NOTE.
+ *
+ * By default, annotations expand to nothing.  This file implements
+ * that.  Tools using annotations will interpose a different version
+ * of this file that will expand annotations as needed.
+ */
+
+#ifndef	_SYS_NOTE_H
+#define	_SYS_NOTE_H
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#ifndef _NOTE
+#define	_NOTE(s)
+#endif
+
+#define	NOTE(s)	_NOTE(s)
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _SYS_NOTE_H */

include/sys/nvpair.h

@@ -29,11 +29,6 @@
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/errno.h>
-#include <sys/va_list.h>
-
-#if defined(_KERNEL) && !defined(_BOOT)
-#include <sys/kmem.h>
-#endif
 
 #ifdef	__cplusplus
 extern "C" {
@@ -142,7 +137,7 @@ struct nv_alloc_ops {
 extern const nv_alloc_ops_t *nv_fixed_ops;
 extern nv_alloc_t *nv_alloc_nosleep;
 
-#if defined(_KERNEL) && !defined(_BOOT)
+#if defined(_KERNEL)
 extern nv_alloc_t *nv_alloc_sleep;
 extern nv_alloc_t *nv_alloc_pushpage;
 #endif

include/sys/xvattr.h

@@ -40,6 +40,7 @@
 #define	_SYS_XVATTR_H
 
 #include <sys/vnode.h>
+#include <sys/strings.h>
 
 #define	AV_SCANSTAMP_SZ	32		/* length of anti-virus scanstamp */
 

include/sys/zfs_context.h

@@ -32,31 +32,25 @@
 
 #include <sys/note.h>
 #include <sys/types.h>
-#include <sys/t_lock.h>
 #include <sys/atomic.h>
 #include <sys/sysmacros.h>
-#include <sys/bitmap.h>
+#include <sys/vmsystm.h>
+#include <sys/condvar.h>
 #include <sys/cmn_err.h>
 #include <sys/kmem.h>
 #include <sys/kmem_cache.h>
 #include <sys/vmem.h>
 #include <sys/taskq.h>
-#include <sys/buf.h>
 #include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/cpuvar.h>
 #include <sys/kobj.h>
-#include <sys/conf.h>
 #include <sys/disp.h>
 #include <sys/debug.h>
 #include <sys/random.h>
+#include <sys/strings.h>
 #include <sys/byteorder.h>
-#include <sys/systm.h>
 #include <sys/list.h>
 #include <sys/uio_impl.h>
-#include <sys/dirent.h>
 #include <sys/time.h>
-#include <vm/seg_kmem.h>
 #include <sys/zone.h>
 #include <sys/sdt.h>
 #include <sys/kstat.h>
@@ -76,8 +70,6 @@
 #define	_SYS_MUTEX_H
 #define	_SYS_RWLOCK_H
 #define	_SYS_CONDVAR_H
-#define	_SYS_SYSTM_H
-#define	_SYS_T_LOCK_H
 #define	_SYS_VNODE_H
 #define	_SYS_VFS_H
 #define	_SYS_SUNDDI_H

include/sys/zfs_delay.h

@@ -22,7 +22,7 @@
 #ifndef	_SYS_FS_ZFS_DELAY_H
 #define	_SYS_FS_ZFS_DELAY_H
 
-#include <linux/delay_compat.h>
+#include <sys/timer.h>
 
 /*
  * Generic wrapper to sleep until a given time.

include/sys/zfs_fuid.h

@@ -27,7 +27,6 @@
 #define	_SYS_FS_ZFS_FUID_H
 
 #ifdef _KERNEL
-#include <sys/kidmap.h>
 #include <sys/sid.h>
 #include <sys/dmu.h>
 #include <sys/zfs_vfsops.h>

include/sys/zfs_znode.h

@@ -30,7 +30,6 @@
 #ifdef _KERNEL
 #include <sys/isa_defs.h>
 #include <sys/types32.h>
-#include <sys/attr.h>
 #include <sys/list.h>
 #include <sys/dmu.h>
 #include <sys/sa.h>

include/sys/zpl.h

@@ -31,7 +31,6 @@
 #include <linux/dcache_compat.h>
 #include <linux/exportfs.h>
 #include <linux/falloc.h>
-#include <linux/file_compat.h>
 #include <linux/parser.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/vfs_compat.h>