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/spl/Makefile.am

@@ -0,0 +1 @@
+SUBDIRS = rpc sys

include/spl/rpc/Makefile.am

@@ -0,0 +1,7 @@
+KERNEL_H = \
+	$(top_srcdir)/include/spl/rpc/xdr.h
+
+if CONFIG_KERNEL
+kerneldir = @prefix@/src/zfs-$(VERSION)/include/spl/rpc
+kernel_HEADERS = $(KERNEL_H)
+endif

include/spl/sys/Makefile.am

@@ -0,0 +1,61 @@
+KERNEL_H = \
+	$(top_srcdir)/include/spl/sys/acl.h \
+	$(top_srcdir)/include/spl/sys/atomic.h \
+	$(top_srcdir)/include/spl/sys/byteorder.h \
+	$(top_srcdir)/include/spl/sys/callb.h \
+	$(top_srcdir)/include/spl/sys/callo.h \
+	$(top_srcdir)/include/spl/sys/cmn_err.h \
+	$(top_srcdir)/include/spl/sys/condvar.h \
+	$(top_srcdir)/include/spl/sys/console.h \
+	$(top_srcdir)/include/spl/sys/cred.h \
+	$(top_srcdir)/include/spl/sys/ctype.h \
+	$(top_srcdir)/include/spl/sys/debug.h \
+	$(top_srcdir)/include/spl/sys/disp.h \
+	$(top_srcdir)/include/spl/sys/dkioc_free_util.h \
+	$(top_srcdir)/include/spl/sys/dkio.h \
+	$(top_srcdir)/include/spl/sys/errno.h \
+	$(top_srcdir)/include/spl/sys/fcntl.h \
+	$(top_srcdir)/include/spl/sys/file.h \
+	$(top_srcdir)/include/spl/sys/inttypes.h \
+	$(top_srcdir)/include/spl/sys/isa_defs.h \
+	$(top_srcdir)/include/spl/sys/kmem_cache.h \
+	$(top_srcdir)/include/spl/sys/kmem.h \
+	$(top_srcdir)/include/spl/sys/kobj.h \
+	$(top_srcdir)/include/spl/sys/kstat.h \
+	$(top_srcdir)/include/spl/sys/list.h \
+	$(top_srcdir)/include/spl/sys/mode.h \
+	$(top_srcdir)/include/spl/sys/mutex.h \
+	$(top_srcdir)/include/spl/sys/param.h \
+	$(top_srcdir)/include/spl/sys/processor.h \
+	$(top_srcdir)/include/spl/sys/proc.h \
+	$(top_srcdir)/include/spl/sys/random.h \
+	$(top_srcdir)/include/spl/sys/rwlock.h \
+	$(top_srcdir)/include/spl/sys/shrinker.h \
+	$(top_srcdir)/include/spl/sys/sid.h \
+	$(top_srcdir)/include/spl/sys/signal.h \
+	$(top_srcdir)/include/spl/sys/stat.h \
+	$(top_srcdir)/include/spl/sys/strings.h \
+	$(top_srcdir)/include/spl/sys/sunddi.h \
+	$(top_srcdir)/include/spl/sys/sysmacros.h \
+	$(top_srcdir)/include/spl/sys/systeminfo.h \
+	$(top_srcdir)/include/spl/sys/taskq.h \
+	$(top_srcdir)/include/spl/sys/thread.h \
+	$(top_srcdir)/include/spl/sys/time.h \
+	$(top_srcdir)/include/spl/sys/timer.h \
+	$(top_srcdir)/include/spl/sys/tsd.h \
+	$(top_srcdir)/include/spl/sys/types32.h \
+	$(top_srcdir)/include/spl/sys/types.h \
+	$(top_srcdir)/include/spl/sys/uio.h \
+	$(top_srcdir)/include/spl/sys/user.h \
+	$(top_srcdir)/include/spl/sys/vfs.h \
+	$(top_srcdir)/include/spl/sys/vmem.h \
+	$(top_srcdir)/include/spl/sys/vmsystm.h \
+	$(top_srcdir)/include/spl/sys/vnode.h \
+	$(top_srcdir)/include/spl/sys/wait.h \
+	$(top_srcdir)/include/spl/sys/zmod.h \
+	$(top_srcdir)/include/spl/sys/zone.h
+
+if CONFIG_KERNEL
+kerneldir = @prefix@/src/zfs-$(VERSION)/include/spl/sys
+kernel_HEADERS = $(KERNEL_H)
+endif

include/spl/sys/debug.h

@@ -92,7 +92,6 @@ void spl_dumpstack(void);
  */
 #ifdef NDEBUG
 
-#define	SPL_DEBUG_STR		""
 #define	ASSERT(x)		((void)0)
 #define	ASSERTV(x)
 #define	ASSERT3B(x,y,z)		((void)0)
@@ -108,7 +107,6 @@ void spl_dumpstack(void);
  */
 #else
 
-#define	SPL_DEBUG_STR		" (DEBUG mode)"
 #define	ASSERT(cond)		VERIFY(cond)
 #define	ASSERTV(x)		x
 #define	ASSERT3B(x,y,z)		VERIFY3B(x, y, z)

include/spl/sys/errno.h

@@ -0,0 +1,47 @@
+/*
+ * 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 2000 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
+/*	  All Rights Reserved	*/
+
+/*
+ * University Copyright- Copyright (c) 1982, 1986, 1988
+ * The Regents of the University of California
+ * All Rights Reserved
+ *
+ * University Acknowledgment- Portions of this document are derived from
+ * software developed by the University of California, Berkeley, and its
+ * contributors.
+ */
+
+#ifndef _SYS_ERRNO_H
+#define	_SYS_ERRNO_H
+
+#include <linux/errno.h>
+
+#define	ENOTSUP		EOPNOTSUPP
+
+#endif	/* _SYS_ERRNO_H */

include/spl/sys/mutex.h

@@ -28,6 +28,7 @@
 #include <sys/types.h>
 #include <linux/mutex.h>
 #include <linux/lockdep.h>
+#include <linux/compiler_compat.h>
 
 typedef enum {
 	MUTEX_DEFAULT	= 0,
@@ -59,7 +60,7 @@ spl_mutex_clear_owner(kmutex_t *mp)
 	mp->m_owner = NULL;
 }
 
-#define	mutex_owner(mp)		(ACCESS_ONCE((mp)->m_owner))
+#define	mutex_owner(mp)		(READ_ONCE((mp)->m_owner))
 #define	mutex_owned(mp)		(mutex_owner(mp) == current)
 #define	MUTEX_HELD(mp)		mutex_owned(mp)
 #define	MUTEX_NOT_HELD(mp)	(!MUTEX_HELD(mp))

include/spl/sys/rwlock.h

@@ -27,6 +27,7 @@
 
 #include <sys/types.h>
 #include <linux/rwsem.h>
+#include <linux/sched.h>
 
 /* Linux kernel compatibility */
 #if defined(CONFIG_PREEMPT_RT_FULL)

include/spl/sys/sysmacros.h

@@ -79,7 +79,6 @@
 #define	max_ncpus			num_possible_cpus()
 #define	boot_ncpus			num_online_cpus()
 #define	CPU_SEQID			smp_processor_id()
-#define	_NOTE(x)
 #define	is_system_labeled()		0
 
 #ifndef RLIM64_INFINITY

include/spl/sys/types.h

@@ -28,11 +28,11 @@
 #include <linux/types.h>
 
 #ifndef ULLONG_MAX
-#define	ULLONG_MAX			(~0ULL)
+#define	ULLONG_MAX		(~0ULL)
 #endif
 
 #ifndef LLONG_MAX
-#define	LLONG_MAX			((long long)(~0ULL>>1))
+#define	LLONG_MAX		((long long)(~0ULL>>1))
 #endif
 
 typedef enum {

include/spl/sys/vnode.h

@@ -86,7 +86,7 @@
 #define	AT_MTIME	ATTR_MTIME
 #define	AT_CTIME	ATTR_CTIME
 
-#define	ATTR_XVATTR	(1 << 31)
+#define	ATTR_XVATTR	(1U << 31)
 #define	AT_XVATTR	ATTR_XVATTR
 
 #define	ATTR_IATTR_MASK	(ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_SIZE | \
@@ -120,7 +120,7 @@ typedef enum vtype {
 
 typedef struct vattr {
 	enum vtype	va_type;	/* vnode type */
-	uint_t		va_mask;	/* attribute bit-mask */
+	uint32_t	va_mask;	/* attribute bit-mask */
 	ushort_t	va_mode;	/* acc mode */
 	uid_t		va_uid;		/* owner uid */
 	gid_t		va_gid;		/* owner gid */