Prepare SPL repo to merge with ZFS repo

This commit removes everything from the repository except the core
SPL implementation for Linux.  Those files which remain have been
moved to non-conflicting locations to facilitate the merge.
The README.md and associated files have been updated accordingly.

Signed-off-by: Brian Behlendorf <[email protected]>

55 files changed, 4946 insertions, 0 deletions

diff --git a/include/spl/rpc/xdr.h b/include/spl/rpc/xdr.h
new file mode 100644
index 000000000..0b39b46cf
--- /dev/null
+++ b/include/spl/rpc/xdr.h
@@ -0,0 +1,156 @@
+/*
+ *  Copyright (c) 2008 Sun Microsystems, Inc.
+ *  Written by Ricardo Correia <[email protected]>
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_RPC_XDR_H
+#define	_SPL_RPC_XDR_H
+
+#include <sys/types.h>
+
+typedef int bool_t;
+
+/*
+ * XDR enums and types.
+ */
+enum xdr_op {
+	XDR_ENCODE,
+	XDR_DECODE
+};
+
+struct xdr_ops;
+
+typedef struct {
+	struct xdr_ops	*x_ops;	/* Let caller know xdrmem_create() succeeds */
+	caddr_t		x_addr;	/* Current buffer addr */
+	caddr_t		x_addr_end;	/* End of the buffer */
+	enum xdr_op	x_op;	/* Stream direction */
+} XDR;
+
+typedef bool_t (*xdrproc_t)(XDR *xdrs, void *ptr);
+
+struct xdr_ops {
+	bool_t (*xdr_control)(XDR *, int, void *);
+
+	bool_t (*xdr_char)(XDR *, char *);
+	bool_t (*xdr_u_short)(XDR *, unsigned short *);
+	bool_t (*xdr_u_int)(XDR *, unsigned *);
+	bool_t (*xdr_u_longlong_t)(XDR *, u_longlong_t *);
+
+	bool_t (*xdr_opaque)(XDR *, caddr_t, const uint_t);
+	bool_t (*xdr_string)(XDR *, char **, const uint_t);
+	bool_t (*xdr_array)(XDR *, caddr_t *, uint_t *, const uint_t,
+	    const uint_t, const xdrproc_t);
+};
+
+/*
+ * XDR control operator.
+ */
+#define	XDR_GET_BYTES_AVAIL 1
+
+struct xdr_bytesrec {
+	bool_t xc_is_last_record;
+	size_t xc_num_avail;
+};
+
+/*
+ * XDR functions.
+ */
+void xdrmem_create(XDR *xdrs, const caddr_t addr, const uint_t size,
+    const enum xdr_op op);
+
+/* Currently not needed. If needed later, we'll add it to struct xdr_ops */
+#define	xdr_destroy(xdrs) ((void) 0)
+
+#define	xdr_control(xdrs, req, info) \
+	(xdrs)->x_ops->xdr_control((xdrs), (req), (info))
+
+/*
+ * For precaution, the following are defined as static inlines instead of macros
+ * to get some amount of type safety.
+ *
+ * Also, macros wouldn't work in the case where typecasting is done, because it
+ * must be possible to reference the functions' addresses by these names.
+ */
+static inline bool_t xdr_char(XDR *xdrs, char *cp)
+{
+	return (xdrs->x_ops->xdr_char(xdrs, cp));
+}
+
+static inline bool_t xdr_u_short(XDR *xdrs, unsigned short *usp)
+{
+	return (xdrs->x_ops->xdr_u_short(xdrs, usp));
+}
+
+static inline bool_t xdr_short(XDR *xdrs, short *sp)
+{
+	BUILD_BUG_ON(sizeof (short) != 2);
+	return (xdrs->x_ops->xdr_u_short(xdrs, (unsigned short *) sp));
+}
+
+static inline bool_t xdr_u_int(XDR *xdrs, unsigned *up)
+{
+	return (xdrs->x_ops->xdr_u_int(xdrs, up));
+}
+
+static inline bool_t xdr_int(XDR *xdrs, int *ip)
+{
+	BUILD_BUG_ON(sizeof (int) != 4);
+	return (xdrs->x_ops->xdr_u_int(xdrs, (unsigned *)ip));
+}
+
+static inline bool_t xdr_u_longlong_t(XDR *xdrs, u_longlong_t *ullp)
+{
+	return (xdrs->x_ops->xdr_u_longlong_t(xdrs, ullp));
+}
+
+static inline bool_t xdr_longlong_t(XDR *xdrs, longlong_t *llp)
+{
+	BUILD_BUG_ON(sizeof (longlong_t) != 8);
+	return (xdrs->x_ops->xdr_u_longlong_t(xdrs, (u_longlong_t *)llp));
+}
+
+/*
+ * Fixed-length opaque data.
+ */
+static inline bool_t xdr_opaque(XDR *xdrs, caddr_t cp, const uint_t cnt)
+{
+	return (xdrs->x_ops->xdr_opaque(xdrs, cp, cnt));
+}
+
+/*
+ * Variable-length string.
+ * The *sp buffer must have (maxsize + 1) bytes.
+ */
+static inline bool_t xdr_string(XDR *xdrs, char **sp, const uint_t maxsize)
+{
+	return (xdrs->x_ops->xdr_string(xdrs, sp, maxsize));
+}
+
+/*
+ * Variable-length arrays.
+ */
+static inline bool_t xdr_array(XDR *xdrs, caddr_t *arrp, uint_t *sizep,
+    const uint_t maxsize, const uint_t elsize, const xdrproc_t elproc)
+{
+	return xdrs->x_ops->xdr_array(xdrs, arrp, sizep, maxsize, elsize,
+	    elproc);
+}
+
+#endif /* SPL_RPC_XDR_H */
diff --git a/include/spl/sys/acl.h b/include/spl/sys/acl.h
new file mode 100644
index 000000000..9fc79c025
--- /dev/null
+++ b/include/spl/sys/acl.h
@@ -0,0 +1,119 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_ACL_H
+#define	_SPL_ACL_H
+
+#include <sys/types.h>
+
+typedef struct ace {
+	uid_t a_who;
+	uint32_t a_access_mask;
+	uint16_t a_flags;
+	uint16_t a_type;
+} ace_t;
+
+typedef struct ace_object {
+	uid_t		a_who;		/* uid or gid */
+	uint32_t	a_access_mask;	/* read,write,... */
+	uint16_t	a_flags;	/* see below */
+	uint16_t	a_type;		/* allow or deny */
+	uint8_t		a_obj_type[16];	/* obj type */
+	uint8_t		a_inherit_obj_type[16];	/* inherit obj */
+} ace_object_t;
+
+#define	MAX_ACL_ENTRIES					1024
+
+#define	ACE_READ_DATA					0x00000001
+#define	ACE_LIST_DIRECTORY				0x00000001
+#define	ACE_WRITE_DATA					0x00000002
+#define	ACE_ADD_FILE					0x00000002
+#define	ACE_APPEND_DATA					0x00000004
+#define	ACE_ADD_SUBDIRECTORY				0x00000004
+#define	ACE_READ_NAMED_ATTRS				0x00000008
+#define	ACE_WRITE_NAMED_ATTRS				0x00000010
+#define	ACE_EXECUTE					0x00000020
+#define	ACE_DELETE_CHILD				0x00000040
+#define	ACE_READ_ATTRIBUTES				0x00000080
+#define	ACE_WRITE_ATTRIBUTES				0x00000100
+#define	ACE_DELETE					0x00010000
+#define	ACE_READ_ACL					0x00020000
+#define	ACE_WRITE_ACL					0x00040000
+#define	ACE_WRITE_OWNER					0x00080000
+#define	ACE_SYNCHRONIZE					0x00100000
+
+#define	ACE_FILE_INHERIT_ACE				0x0001
+#define	ACE_DIRECTORY_INHERIT_ACE			0x0002
+#define	ACE_NO_PROPAGATE_INHERIT_ACE			0x0004
+#define	ACE_INHERIT_ONLY_ACE				0x0008
+#define	ACE_SUCCESSFUL_ACCESS_ACE_FLAG			0x0010
+#define	ACE_FAILED_ACCESS_ACE_FLAG			0x0020
+#define	ACE_IDENTIFIER_GROUP				0x0040
+#define	ACE_INHERITED_ACE				0x0080
+#define	ACE_OWNER					0x1000
+#define	ACE_GROUP					0x2000
+#define	ACE_EVERYONE					0x4000
+
+#define	ACE_ACCESS_ALLOWED_ACE_TYPE			0x0000
+#define	ACE_ACCESS_DENIED_ACE_TYPE			0x0001
+#define	ACE_SYSTEM_AUDIT_ACE_TYPE			0x0002
+#define	ACE_SYSTEM_ALARM_ACE_TYPE			0x0003
+
+#define	ACL_AUTO_INHERIT				0x0001
+#define	ACL_PROTECTED					0x0002
+#define	ACL_DEFAULTED					0x0004
+#define	ACL_FLAGS_ALL	(ACL_AUTO_INHERIT|ACL_PROTECTED|ACL_DEFAULTED)
+
+#define	ACE_ACCESS_ALLOWED_COMPOUND_ACE_TYPE		0x04
+#define	ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE		0x05
+#define	ACE_ACCESS_DENIED_OBJECT_ACE_TYPE		0x06
+#define	ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE		0x07
+#define	ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE		0x08
+#define	ACE_ACCESS_ALLOWED_CALLBACK_ACE_TYPE		0x09
+#define	ACE_ACCESS_DENIED_CALLBACK_ACE_TYPE		0x0A
+#define	ACE_ACCESS_ALLOWED_CALLBACK_OBJECT_ACE_TYPE	0x0B
+#define	ACE_ACCESS_DENIED_CALLBACK_OBJECT_ACE_TYPE	0x0C
+#define	ACE_SYSTEM_AUDIT_CALLBACK_ACE_TYPE		0x0D
+#define	ACE_SYSTEM_ALARM_CALLBACK_ACE_TYPE		0x0E
+#define	ACE_SYSTEM_AUDIT_CALLBACK_OBJECT_ACE_TYPE	0x0F
+#define	ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE	0x10
+
+#define	ACE_ALL_TYPES	0x001F
+
+#define	ACE_TYPE_FLAGS	(ACE_OWNER|ACE_GROUP|ACE_EVERYONE|ACE_IDENTIFIER_GROUP)
+
+/* BEGIN CSTYLED */
+#define	ACE_ALL_PERMS	(ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
+     ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_READ_NAMED_ATTRS| \
+     ACE_WRITE_NAMED_ATTRS|ACE_EXECUTE|ACE_DELETE_CHILD|ACE_READ_ATTRIBUTES| \
+     ACE_WRITE_ATTRIBUTES|ACE_DELETE|ACE_READ_ACL|ACE_WRITE_ACL| \
+     ACE_WRITE_OWNER|ACE_SYNCHRONIZE)
+/* END CSTYLED */
+
+#define	VSA_ACE						0x0010
+#define	VSA_ACECNT					0x0020
+#define	VSA_ACE_ALLTYPES				0x0040
+#define	VSA_ACE_ACLFLAGS				0x0080
+
+#endif /* _SPL_ACL_H */
diff --git a/include/spl/sys/atomic.h b/include/spl/sys/atomic.h
new file mode 100644
index 000000000..51b547923
--- /dev/null
+++ b/include/spl/sys/atomic.h
@@ -0,0 +1,79 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_ATOMIC_H
+#define	_SPL_ATOMIC_H
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <sys/types.h>
+
+/*
+ * Map the atomic_* functions to the Linux counterparts.  This relies on the
+ * fact that the atomic types are internally really a uint32 or uint64.  If
+ * this were to change an alternate approach would be needed.
+ *
+ * N.B. Due to the limitations of the original API atomicity is not strictly
+ * preserved when using the 64-bit functions on a 32-bit system.  In order
+ * to support this all consumers would need to be updated to use the Linux
+ * provided atomic_t and atomic64_t types.
+ */
+#define	atomic_inc_32(v)	atomic_inc((atomic_t *)(v))
+#define	atomic_dec_32(v)	atomic_dec((atomic_t *)(v))
+#define	atomic_add_32(v, i)	atomic_add((i), (atomic_t *)(v))
+#define	atomic_sub_32(v, i)	atomic_sub((i), (atomic_t *)(v))
+#define	atomic_inc_32_nv(v)	atomic_inc_return((atomic_t *)(v))
+#define	atomic_dec_32_nv(v)	atomic_dec_return((atomic_t *)(v))
+#define	atomic_add_32_nv(v, i)	atomic_add_return((i), (atomic_t *)(v))
+#define	atomic_sub_32_nv(v, i)	atomic_sub_return((i), (atomic_t *)(v))
+#define	atomic_cas_32(v, x, y)	atomic_cmpxchg((atomic_t *)(v), x, y)
+#define	atomic_swap_32(v, x)	atomic_xchg((atomic_t *)(v), x)
+#define	atomic_inc_64(v)	atomic64_inc((atomic64_t *)(v))
+#define	atomic_dec_64(v)	atomic64_dec((atomic64_t *)(v))
+#define	atomic_add_64(v, i)	atomic64_add((i), (atomic64_t *)(v))
+#define	atomic_sub_64(v, i)	atomic64_sub((i), (atomic64_t *)(v))
+#define	atomic_inc_64_nv(v)	atomic64_inc_return((atomic64_t *)(v))
+#define	atomic_dec_64_nv(v)	atomic64_dec_return((atomic64_t *)(v))
+#define	atomic_add_64_nv(v, i)	atomic64_add_return((i), (atomic64_t *)(v))
+#define	atomic_sub_64_nv(v, i)	atomic64_sub_return((i), (atomic64_t *)(v))
+#define	atomic_cas_64(v, x, y)	atomic64_cmpxchg((atomic64_t *)(v), x, y)
+#define	atomic_swap_64(v, x)	atomic64_xchg((atomic64_t *)(v), x)
+
+#ifdef _LP64
+static __inline__ void *
+atomic_cas_ptr(volatile void *target,  void *cmp, void *newval)
+{
+	return ((void *)atomic_cas_64((volatile uint64_t *)target,
+	    (uint64_t)cmp, (uint64_t)newval));
+}
+#else /* _LP64 */
+static __inline__ void *
+atomic_cas_ptr(volatile void *target,  void *cmp, void *newval)
+{
+	return ((void *)atomic_cas_32((volatile uint32_t *)target,
+	    (uint32_t)cmp, (uint32_t)newval));
+}
+#endif /* _LP64 */
+
+#endif  /* _SPL_ATOMIC_H */
diff --git a/include/spl/sys/byteorder.h b/include/spl/sys/byteorder.h
new file mode 100644
index 000000000..477707996
--- /dev/null
+++ b/include/spl/sys/byteorder.h
@@ -0,0 +1,78 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_BYTEORDER_H
+#define	_SPL_BYTEORDER_H
+
+#include <asm/byteorder.h>
+#include <sys/isa_defs.h>
+
+#define	BSWAP_8(x)	((x) & 0xff)
+#define	BSWAP_16(x)	((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
+#define	BSWAP_32(x)	((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
+#define	BSWAP_64(x)	((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
+
+#define	LE_16(x)	cpu_to_le16(x)
+#define	LE_32(x)	cpu_to_le32(x)
+#define	LE_64(x)	cpu_to_le64(x)
+#define	BE_16(x)	cpu_to_be16(x)
+#define	BE_32(x)	cpu_to_be32(x)
+#define	BE_64(x)	cpu_to_be64(x)
+
+#define	BE_IN8(xa) \
+	*((uint8_t *)(xa))
+
+#define	BE_IN16(xa) \
+	(((uint16_t)BE_IN8(xa) << 8) | BE_IN8((uint8_t *)(xa)+1))
+
+#define	BE_IN32(xa) \
+	(((uint32_t)BE_IN16(xa) << 16) | BE_IN16((uint8_t *)(xa)+2))
+
+#ifdef _BIG_ENDIAN
+static __inline__ uint64_t
+htonll(uint64_t n)
+{
+	return (n);
+}
+
+static __inline__ uint64_t
+ntohll(uint64_t n)
+{
+	return (n);
+}
+#else
+static __inline__ uint64_t
+htonll(uint64_t n)
+{
+	return ((((uint64_t)htonl(n)) << 32) + htonl(n >> 32));
+}
+
+static __inline__ uint64_t
+ntohll(uint64_t n)
+{
+	return ((((uint64_t)ntohl(n)) << 32) + ntohl(n >> 32));
+}
+#endif
+
+#endif /* SPL_BYTEORDER_H */
diff --git a/include/spl/sys/callb.h b/include/spl/sys/callb.h
new file mode 100644
index 000000000..f1826bfd3
--- /dev/null
+++ b/include/spl/sys/callb.h
@@ -0,0 +1,54 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_CALLB_H
+#define	_SPL_CALLB_H
+
+#include <linux/module.h>
+#include <sys/mutex.h>
+
+#define	CALLB_CPR_ASSERT(cp)		ASSERT(MUTEX_HELD((cp)->cc_lockp));
+
+typedef struct callb_cpr {
+	kmutex_t	*cc_lockp;
+} callb_cpr_t;
+
+#define	CALLB_CPR_INIT(cp, lockp, func, name)   {               \
+	(cp)->cc_lockp = lockp;                                 \
+}
+
+#define	CALLB_CPR_SAFE_BEGIN(cp) {                              \
+	CALLB_CPR_ASSERT(cp);					\
+}
+
+#define	CALLB_CPR_SAFE_END(cp, lockp) {                         \
+	CALLB_CPR_ASSERT(cp);					\
+}
+
+#define	CALLB_CPR_EXIT(cp) {                                    \
+	ASSERT(MUTEX_HELD((cp)->cc_lockp));                     \
+	mutex_exit((cp)->cc_lockp);                             \
+}
+
+#endif  /* _SPL_CALLB_H */
diff --git a/include/spl/sys/callo.h b/include/spl/sys/callo.h
new file mode 100644
index 000000000..c43ac92e7
--- /dev/null
+++ b/include/spl/sys/callo.h
@@ -0,0 +1,52 @@
+/*
+ *  Copyright (C) 2007-2013 Lawrence Livermore National Security, LLC.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_CALLO_H
+#define	_SPL_CALLO_H
+
+/*
+ * Callout flags:
+ *
+ * CALLOUT_FLAG_ROUNDUP
+ *      Roundup the expiration time to the next resolution boundary.
+ *      If this flag is not specified, the expiration time is rounded down.
+ * CALLOUT_FLAG_ABSOLUTE
+ *      Normally, the expiration passed to the timeout API functions is an
+ *      expiration interval. If this flag is specified, then it is
+ *      interpreted as the expiration time itself.
+ * CALLOUT_FLAG_HRESTIME
+ *      Normally, callouts are not affected by changes to system time
+ *      (hrestime). This flag is used to create a callout that is affected
+ *      by system time. If system time changes, these timers must be
+ *      handled in a special way (see callout.c). These are used by condition
+ *      variables and LWP timers that need this behavior.
+ * CALLOUT_FLAG_32BIT
+ *      Legacy interfaces timeout() and realtime_timeout() pass this flag
+ *      to timeout_generic() to indicate that a 32-bit ID should be allocated.
+ */
+#define	CALLOUT_FLAG_ROUNDUP		0x1
+#define	CALLOUT_FLAG_ABSOLUTE		0x2
+#define	CALLOUT_FLAG_HRESTIME		0x4
+#define	CALLOUT_FLAG_32BIT		0x8
+
+#endif  /* _SPL_CALLB_H */
diff --git a/include/spl/sys/cmn_err.h b/include/spl/sys/cmn_err.h
new file mode 100644
index 000000000..be57358b0
--- /dev/null
+++ b/include/spl/sys/cmn_err.h
@@ -0,0 +1,42 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_CMN_ERR_H
+#define	_SPL_CMN_ERR_H
+
+#include <stdarg.h>
+
+#define	CE_CONT		0 /* continuation */
+#define	CE_NOTE		1 /* notice */
+#define	CE_WARN		2 /* warning */
+#define	CE_PANIC	3 /* panic */
+#define	CE_IGNORE	4 /* print nothing */
+
+extern void cmn_err(int, const char *, ...);
+extern void vcmn_err(int, const char *, va_list);
+extern void vpanic(const char *, va_list);
+
+#define	fm_panic	panic
+
+#endif /* SPL_CMN_ERR_H */
diff --git a/include/spl/sys/condvar.h b/include/spl/sys/condvar.h
new file mode 100644
index 000000000..1d47cdd96
--- /dev/null
+++ b/include/spl/sys/condvar.h
@@ -0,0 +1,80 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_CONDVAR_H
+#define	_SPL_CONDVAR_H
+
+#include <linux/module.h>
+#include <sys/kmem.h>
+#include <sys/mutex.h>
+#include <sys/callo.h>
+#include <sys/wait.h>
+
+/*
+ * The kcondvar_t struct is protected by mutex taken externally before
+ * calling any of the wait/signal funs, and passed into the wait funs.
+ */
+#define	CV_MAGIC			0x346545f4
+#define	CV_DESTROY			0x346545f5
+
+typedef struct {
+	int cv_magic;
+	spl_wait_queue_head_t cv_event;
+	spl_wait_queue_head_t cv_destroy;
+	atomic_t cv_refs;
+	atomic_t cv_waiters;
+	kmutex_t *cv_mutex;
+} kcondvar_t;
+
+typedef enum { CV_DEFAULT = 0, CV_DRIVER } kcv_type_t;
+
+extern void __cv_init(kcondvar_t *, char *, kcv_type_t, void *);
+extern void __cv_destroy(kcondvar_t *);
+extern void __cv_wait(kcondvar_t *, kmutex_t *);
+extern void __cv_wait_io(kcondvar_t *, kmutex_t *);
+extern void __cv_wait_sig(kcondvar_t *, kmutex_t *);
+extern clock_t __cv_timedwait(kcondvar_t *, kmutex_t *, clock_t);
+extern clock_t __cv_timedwait_io(kcondvar_t *, kmutex_t *, clock_t);
+extern clock_t __cv_timedwait_sig(kcondvar_t *, kmutex_t *, clock_t);
+extern clock_t cv_timedwait_hires(kcondvar_t *, kmutex_t *, hrtime_t,
+    hrtime_t res, int flag);
+extern clock_t cv_timedwait_sig_hires(kcondvar_t *, kmutex_t *, hrtime_t,
+    hrtime_t res, int flag);
+extern void __cv_signal(kcondvar_t *);
+extern void __cv_broadcast(kcondvar_t *c);
+
+#define	cv_init(cvp, name, type, arg)		__cv_init(cvp, name, type, arg)
+#define	cv_destroy(cvp)				__cv_destroy(cvp)
+#define	cv_wait(cvp, mp)			__cv_wait(cvp, mp)
+#define	cv_wait_io(cvp, mp)			__cv_wait_io(cvp, mp)
+#define	cv_wait_sig(cvp, mp)			__cv_wait_sig(cvp, mp)
+#define	cv_wait_interruptible(cvp, mp)		cv_wait_sig(cvp, mp)
+#define	cv_timedwait(cvp, mp, t)		__cv_timedwait(cvp, mp, t)
+#define	cv_timedwait_io(cvp, mp, t)		__cv_timedwait_io(cvp, mp, t)
+#define	cv_timedwait_sig(cvp, mp, t)		__cv_timedwait_sig(cvp, mp, t)
+#define	cv_timedwait_interruptible(cvp, mp, t)	cv_timedwait_sig(cvp, mp, t)
+#define	cv_signal(cvp)				__cv_signal(cvp)
+#define	cv_broadcast(cvp)			__cv_broadcast(cvp)
+
+#endif /* _SPL_CONDVAR_H */
diff --git a/include/spl/sys/console.h b/include/spl/sys/console.h
new file mode 100644
index 000000000..3469cb762
--- /dev/null
+++ b/include/spl/sys/console.h
@@ -0,0 +1,44 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef	_SPL_CONSOLE_H
+#define	_SPL_CONSOLE_H
+
+void
+console_vprintf(const char *fmt, va_list args)
+{
+	vprintk(fmt, args);
+}
+
+void
+console_printf(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	console_vprintf(fmt, args);
+	va_end(args);
+}
+
+#endif /* _SPL_CONSOLE_H */
diff --git a/include/spl/sys/cred.h b/include/spl/sys/cred.h
new file mode 100644
index 000000000..fd063399b
--- /dev/null
+++ b/include/spl/sys/cred.h
@@ -0,0 +1,75 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_CRED_H
+#define	_SPL_CRED_H
+
+#include <linux/module.h>
+#include <linux/cred.h>
+#include <sys/types.h>
+#include <sys/vfs.h>
+
+typedef struct cred cred_t;
+
+#define	kcred		((cred_t *)(init_task.cred))
+#define	CRED()		((cred_t *)current_cred())
+
+/* Linux 4.9 API change, GROUP_AT was removed */
+#ifndef GROUP_AT
+#define	GROUP_AT(gi, i)	((gi)->gid[i])
+#endif
+
+#ifdef HAVE_KUIDGID_T
+
+#define	KUID_TO_SUID(x)		(__kuid_val(x))
+#define	KGID_TO_SGID(x)		(__kgid_val(x))
+#define	SUID_TO_KUID(x)		(KUIDT_INIT(x))
+#define	SGID_TO_KGID(x)		(KGIDT_INIT(x))
+#define	KGIDP_TO_SGIDP(x)	(&(x)->val)
+
+#else /* HAVE_KUIDGID_T */
+
+#define	KUID_TO_SUID(x)		(x)
+#define	KGID_TO_SGID(x)		(x)
+#define	SUID_TO_KUID(x)		(x)
+#define	SGID_TO_KGID(x)		(x)
+#define	KGIDP_TO_SGIDP(x)	(x)
+
+#endif /* HAVE_KUIDGID_T */
+
+extern void crhold(cred_t *cr);
+extern void crfree(cred_t *cr);
+extern uid_t crgetuid(const cred_t *cr);
+extern uid_t crgetruid(const cred_t *cr);
+extern uid_t crgetsuid(const cred_t *cr);
+extern uid_t crgetfsuid(const cred_t *cr);
+extern gid_t crgetgid(const cred_t *cr);
+extern gid_t crgetrgid(const cred_t *cr);
+extern gid_t crgetsgid(const cred_t *cr);
+extern gid_t crgetfsgid(const cred_t *cr);
+extern int crgetngroups(const cred_t *cr);
+extern gid_t *crgetgroups(const cred_t *cr);
+extern int groupmember(gid_t gid, const cred_t *cr);
+
+#endif  /* _SPL_CRED_H */
diff --git a/include/spl/sys/ctype.h b/include/spl/sys/ctype.h
new file mode 100644
index 000000000..18beb1daa
--- /dev/null
+++ b/include/spl/sys/ctype.h
@@ -0,0 +1,30 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_CTYPE_H
+#define	_SPL_CTYPE_H
+
+#include <linux/ctype.h>
+
+#endif /* SPL_CTYPE_H */
diff --git a/include/spl/sys/debug.h b/include/spl/sys/debug.h
new file mode 100644
index 000000000..a4a458066
--- /dev/null
+++ b/include/spl/sys/debug.h
@@ -0,0 +1,131 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Available Solaris debug functions.  All of the ASSERT() macros will be
+ * compiled out when NDEBUG is defined, this is the default behavior for
+ * the SPL.  To enable assertions use the --enable-debug with configure.
+ * The VERIFY() functions are never compiled out and cannot be disabled.
+ *
+ * PANIC()	- Panic the node and print message.
+ * ASSERT()	- Assert X is true, if not panic.
+ * ASSERTV()	- Wraps a variable declaration which is only used by ASSERT().
+ * ASSERT3B()	- Assert boolean X OP Y is true, if not panic.
+ * ASSERT3S()	- Assert signed X OP Y is true, if not panic.
+ * ASSERT3U()	- Assert unsigned X OP Y is true, if not panic.
+ * ASSERT3P()	- Assert pointer X OP Y is true, if not panic.
+ * ASSERT0()	- Assert value is zero, if not panic.
+ * VERIFY()	- Verify X is true, if not panic.
+ * VERIFY3B()	- Verify boolean X OP Y is true, if not panic.
+ * VERIFY3S()	- Verify signed X OP Y is true, if not panic.
+ * VERIFY3U()	- Verify unsigned X OP Y is true, if not panic.
+ * VERIFY3P()	- Verify pointer X OP Y is true, if not panic.
+ * VERIFY0()	- Verify value is zero, if not panic.
+ */
+
+#ifndef _SPL_DEBUG_H
+#define	_SPL_DEBUG_H
+
+/*
+ * Common DEBUG functionality.
+ */
+int spl_panic(const char *file, const char *func, int line,
+    const char *fmt, ...);
+void spl_dumpstack(void);
+
+/* BEGIN CSTYLED */
+#define	PANIC(fmt, a...)						\
+	spl_panic(__FILE__, __FUNCTION__, __LINE__, fmt, ## a)
+
+#define	VERIFY(cond)							\
+	(void) (unlikely(!(cond)) &&					\
+	    spl_panic(__FILE__, __FUNCTION__, __LINE__,			\
+	    "%s", "VERIFY(" #cond ") failed\n"))
+
+#define	VERIFY3_IMPL(LEFT, OP, RIGHT, TYPE, FMT, CAST)	do {		\
+		TYPE _verify3_left = (TYPE)(LEFT);				\
+		TYPE _verify3_right = (TYPE)(RIGHT);				\
+		if (!(_verify3_left OP _verify3_right))			\
+		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
+		    "VERIFY3(" #LEFT " " #OP " " #RIGHT ") "		\
+		    "failed (" FMT " " #OP " " FMT ")\n",		\
+		    CAST (_verify3_left), CAST (_verify3_right));	\
+	} while (0)
+
+#define	VERIFY3B(x,y,z)	VERIFY3_IMPL(x, y, z, boolean_t, "%d", (boolean_t))
+#define	VERIFY3S(x,y,z)	VERIFY3_IMPL(x, y, z, int64_t, "%lld", (long long))
+#define	VERIFY3U(x,y,z)	VERIFY3_IMPL(x, y, z, uint64_t, "%llu",		\
+				    (unsigned long long))
+#define	VERIFY3P(x,y,z)	VERIFY3_IMPL(x, y, z, uintptr_t, "%p", (void *))
+#define	VERIFY0(x)	VERIFY3_IMPL(0, ==, x, int64_t, "%lld",	(long long))
+
+#define	CTASSERT_GLOBAL(x)		_CTASSERT(x, __LINE__)
+#define	CTASSERT(x)			{ _CTASSERT(x, __LINE__); }
+#define	_CTASSERT(x, y)			__CTASSERT(x, y)
+#define	__CTASSERT(x, y)						\
+	typedef char __attribute__ ((unused))				\
+	__compile_time_assertion__ ## y[(x) ? 1 : -1]
+
+/*
+ * Debugging disabled (--disable-debug)
+ */
+#ifdef NDEBUG
+
+#define	SPL_DEBUG_STR		""
+#define	ASSERT(x)		((void)0)
+#define	ASSERTV(x)
+#define	ASSERT3B(x,y,z)		((void)0)
+#define	ASSERT3S(x,y,z)		((void)0)
+#define	ASSERT3U(x,y,z)		((void)0)
+#define	ASSERT3P(x,y,z)		((void)0)
+#define	ASSERT0(x)		((void)0)
+#define	IMPLY(A, B)		((void)0)
+#define	EQUIV(A, B)		((void)0)
+
+/*
+ * Debugging enabled (--enable-debug)
+ */
+#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)
+#define	ASSERT3S(x,y,z)		VERIFY3S(x, y, z)
+#define	ASSERT3U(x,y,z)		VERIFY3U(x, y, z)
+#define	ASSERT3P(x,y,z)		VERIFY3P(x, y, z)
+#define	ASSERT0(x)		VERIFY0(x)
+#define	IMPLY(A, B) \
+	((void)(((!(A)) || (B)) || \
+	    spl_panic(__FILE__, __FUNCTION__, __LINE__, \
+	    "(" #A ") implies (" #B ")")))
+#define	EQUIV(A, B) \
+	((void)((!!(A) == !!(B)) || \
+	    spl_panic(__FILE__, __FUNCTION__, __LINE__, \
+	    "(" #A ") is equivalent to (" #B ")")))
+/* END CSTYLED */
+
+#endif /* NDEBUG */
+
+#endif /* SPL_DEBUG_H */
diff --git a/include/spl/sys/disp.h b/include/spl/sys/disp.h
new file mode 100644
index 000000000..413b623c8
--- /dev/null
+++ b/include/spl/sys/disp.h
@@ -0,0 +1,34 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_DISP_H
+#define	_SPL_DISP_H
+
+#include <linux/preempt.h>
+
+#define	kpreempt(unused)	schedule()
+#define	kpreempt_disable()	preempt_disable()
+#define	kpreempt_enable()	preempt_enable()
+
+#endif /* SPL_DISP_H */
diff --git a/include/spl/sys/dkio.h b/include/spl/sys/dkio.h
new file mode 100644
index 000000000..49f166a9c
--- /dev/null
+++ b/include/spl/sys/dkio.h
@@ -0,0 +1,40 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_DKIO_H
+#define	_SPL_DKIO_H
+
+#define	DFL_SZ(num_exts) \
+	(sizeof (dkioc_free_list_t) + (num_exts - 1) * 16)
+
+#define	DKIOC		(0x04 << 8)
+#define	DKIOCFLUSHWRITECACHE	(DKIOC|34)	/* flush cache to phys medium */
+
+/*
+ * ioctl to free space (e.g. SCSI UNMAP) off a disk.
+ * Pass a dkioc_free_list_t containing a list of extents to be freed.
+ */
+#define	DKIOCFREE	(DKIOC|50)
+
+#endif /* _SPL_DKIO_H */
diff --git a/include/spl/sys/dkioc_free_util.h b/include/spl/sys/dkioc_free_util.h
new file mode 100644
index 000000000..d519b2f8e
--- /dev/null
+++ b/include/spl/sys/dkioc_free_util.h
@@ -0,0 +1,58 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_DKIOC_UTIL_H
+#define	_SPL_DKIOC_UTIL_H
+
+#include <sys/dkio.h>
+
+typedef struct dkioc_free_list_ext_s {
+	uint64_t		dfle_start;
+	uint64_t		dfle_length;
+} dkioc_free_list_ext_t;
+
+typedef struct dkioc_free_list_s {
+	uint64_t		dfl_flags;
+	uint64_t		dfl_num_exts;
+	int64_t			dfl_offset;
+
+	/*
+	 * N.B. this is only an internal debugging API! This is only called
+	 * from debug builds of sd for pre-release checking. Remove before GA!
+	 */
+	void			(*dfl_ck_func)(uint64_t, uint64_t, void *);
+	void			*dfl_ck_arg;
+
+	dkioc_free_list_ext_t	dfl_exts[1];
+} dkioc_free_list_t;
+
+static inline void dfl_free(dkioc_free_list_t *dfl) {
+	vmem_free(dfl, DFL_SZ(dfl->dfl_num_exts));
+}
+
+static inline dkioc_free_list_t *dfl_alloc(uint64_t dfl_num_exts, int flags) {
+	return (vmem_zalloc(DFL_SZ(dfl_num_exts), flags));
+}
+
+#endif /* _SPL_DKIOC_UTIL_H */
diff --git a/include/spl/sys/fcntl.h b/include/spl/sys/fcntl.h
new file mode 100644
index 000000000..3faa5dad7
--- /dev/null
+++ b/include/spl/sys/fcntl.h
@@ -0,0 +1,37 @@
+/*
+ *  Copyright (C) 2010 Lawrence Livermore National Security, LLC.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_FCNTL_H
+#define	_SPL_FCNTL_H
+
+#include <asm/fcntl.h>
+
+#define	F_FREESP 11
+
+#ifdef CONFIG_64BIT
+typedef struct flock flock64_t;
+#else
+typedef struct flock64 flock64_t;
+#endif /* CONFIG_64BIT */
+
+#endif /* _SPL_FCNTL_H */
diff --git a/include/spl/sys/file.h b/include/spl/sys/file.h
new file mode 100644
index 000000000..05dbc0814
--- /dev/null
+++ b/include/spl/sys/file.h
@@ -0,0 +1,52 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_FILE_H
+#define	_SPL_FILE_H
+
+#define	FIGNORECASE		0x00080000
+#define	FKIOCTL			0x80000000
+#define	ED_CASE_CONFLICT	0x10
+
+#ifdef HAVE_INODE_LOCK_SHARED
+#define	spl_inode_lock(ip)		inode_lock(ip)
+#define	spl_inode_unlock(ip)		inode_unlock(ip)
+#define	spl_inode_lock_shared(ip)	inode_lock_shared(ip)
+#define	spl_inode_unlock_shared(ip)	inode_unlock_shared(ip)
+#define	spl_inode_trylock(ip)		inode_trylock(ip)
+#define	spl_inode_trylock_shared(ip)	inode_trylock_shared(ip)
+#define	spl_inode_is_locked(ip)		inode_is_locked(ip)
+#define	spl_inode_lock_nested(ip, s)	inode_lock_nested(ip, s)
+#else
+#define	spl_inode_lock(ip)		mutex_lock(&(ip)->i_mutex)
+#define	spl_inode_unlock(ip)		mutex_unlock(&(ip)->i_mutex)
+#define	spl_inode_lock_shared(ip)	mutex_lock(&(ip)->i_mutex)
+#define	spl_inode_unlock_shared(ip)	mutex_unlock(&(ip)->i_mutex)
+#define	spl_inode_trylock(ip)		mutex_trylock(&(ip)->i_mutex)
+#define	spl_inode_trylock_shared(ip)	mutex_trylock(&(ip)->i_mutex)
+#define	spl_inode_is_locked(ip)		mutex_is_locked(&(ip)->i_mutex)
+#define	spl_inode_lock_nested(ip, s)	mutex_lock_nested(&(ip)->i_mutex, s)
+#endif
+
+#endif /* SPL_FILE_H */
diff --git a/include/spl/sys/inttypes.h b/include/spl/sys/inttypes.h
new file mode 100644
index 000000000..92e76206b
--- /dev/null
+++ b/include/spl/sys/inttypes.h
@@ -0,0 +1,28 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_INTTYPES_H
+#define	_SPL_INTTYPES_H
+
+#endif /* SPL_INTTYPES_H */
diff --git a/include/spl/sys/isa_defs.h b/include/spl/sys/isa_defs.h
new file mode 100644
index 000000000..089ae0f85
--- /dev/null
+++ b/include/spl/sys/isa_defs.h
@@ -0,0 +1,229 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef	_SPL_ISA_DEFS_H
+#define	_SPL_ISA_DEFS_H
+
+/* x86_64 arch specific defines */
+#if defined(__x86_64) || defined(__x86_64__)
+
+#if !defined(__x86_64)
+#define	__x86_64
+#endif
+
+#if !defined(__amd64)
+#define	__amd64
+#endif
+
+#if !defined(__x86)
+#define	__x86
+#endif
+
+#if !defined(_LP64)
+#define	_LP64
+#endif
+
+#define	_ALIGNMENT_REQUIRED	1
+
+
+/* i386 arch specific defines */
+#elif defined(__i386) || defined(__i386__)
+
+#if !defined(__i386)
+#define	__i386
+#endif
+
+#if !defined(__x86)
+#define	__x86
+#endif
+
+#if !defined(_ILP32)
+#define	_ILP32
+#endif
+
+#define	_ALIGNMENT_REQUIRED	0
+
+/* powerpc (ppc64) arch specific defines */
+#elif defined(__powerpc) || defined(__powerpc__) || defined(__powerpc64__)
+
+#if !defined(__powerpc)
+#define	__powerpc
+#endif
+
+#if !defined(__powerpc__)
+#define	__powerpc__
+#endif
+
+#if defined(__powerpc64__)
+#if !defined(_LP64)
+#define	_LP64
+#endif
+#else
+#if !defined(_ILP32)
+#define	_ILP32
+#endif
+#endif
+
+/*
+ * Illumos doesn't define _ALIGNMENT_REQUIRED for PPC, so default to 1
+ * out of paranoia.
+ */
+#define	_ALIGNMENT_REQUIRED	1
+
+/* arm arch specific defines */
+#elif defined(__arm) || defined(__arm__) || defined(__aarch64__)
+
+#if !defined(__arm)
+#define	__arm
+#endif
+
+#if !defined(__arm__)
+#define	__arm__
+#endif
+
+#if defined(__aarch64__)
+#if !defined(_LP64)
+#define	_LP64
+#endif
+#else
+#if !defined(_ILP32)
+#define	_ILP32
+#endif
+#endif
+
+#if defined(__ARMEL__) || defined(__AARCH64EL__)
+#define	_LITTLE_ENDIAN
+#else
+#define	_BIG_ENDIAN
+#endif
+
+/*
+ * Illumos doesn't define _ALIGNMENT_REQUIRED for ARM, so default to 1
+ * out of paranoia.
+ */
+#define	_ALIGNMENT_REQUIRED	1
+
+/* sparc arch specific defines */
+#elif defined(__sparc) || defined(__sparc__)
+
+#if !defined(__sparc)
+#define	__sparc
+#endif
+
+#if !defined(__sparc__)
+#define	__sparc__
+#endif
+
+#if defined(__arch64__)
+#if !defined(_LP64)
+#define	_LP64
+#endif
+#else
+#if !defined(_ILP32)
+#define	_ILP32
+#endif
+#endif
+
+#define	_BIG_ENDIAN
+#define	_SUNOS_VTOC_16
+#define	_ALIGNMENT_REQUIRED	1
+
+/* s390 arch specific defines */
+#elif defined(__s390__)
+#if defined(__s390x__)
+#if !defined(_LP64)
+#define	_LP64
+#endif
+#else
+#if !defined(_ILP32)
+#define	_ILP32
+#endif
+#endif
+
+#define	_BIG_ENDIAN
+
+/*
+ * Illumos doesn't define _ALIGNMENT_REQUIRED for s390, so default to 1
+ * out of paranoia.
+ */
+#define	_ALIGNMENT_REQUIRED	1
+
+/* MIPS arch specific defines */
+#elif defined(__mips__)
+
+#if defined(__MIPSEB__)
+#define	_BIG_ENDIAN
+#elif defined(__MIPSEL__)
+#define	_LITTLE_ENDIAN
+#else
+#error MIPS no endian specified
+#endif
+
+#ifndef _LP64
+#define	_ILP32
+#endif
+
+#define	_SUNOS_VTOC_16
+
+/*
+ * Illumos doesn't define _ALIGNMENT_REQUIRED for MIPS, so default to 1
+ * out of paranoia.
+ */
+#define	_ALIGNMENT_REQUIRED	1
+
+#else
+/*
+ * Currently supported:
+ * x86_64, i386, arm, powerpc, s390, sparc, and mips
+ */
+#error "Unsupported ISA type"
+#endif
+
+#if defined(_ILP32) && defined(_LP64)
+#error "Both _ILP32 and _LP64 are defined"
+#endif
+
+#if !defined(_ILP32) && !defined(_LP64)
+#error "Neither _ILP32 or _LP64 are defined"
+#endif
+
+#include <sys/byteorder.h>
+
+#if defined(__LITTLE_ENDIAN) && !defined(_LITTLE_ENDIAN)
+#define	_LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif
+
+#if defined(__BIG_ENDIAN) && !defined(_BIG_ENDIAN)
+#define	_BIG_ENDIAN __BIG_ENDIAN
+#endif
+
+#if defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN)
+#error "Both _LITTLE_ENDIAN and _BIG_ENDIAN are defined"
+#endif
+
+#if !defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)
+#error "Neither _LITTLE_ENDIAN or _BIG_ENDIAN are defined"
+#endif
+
+#endif	/* _SPL_ISA_DEFS_H */
diff --git a/include/spl/sys/kmem.h b/include/spl/sys/kmem.h
new file mode 100644
index 000000000..d6b428551
--- /dev/null
+++ b/include/spl/sys/kmem.h
@@ -0,0 +1,185 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_KMEM_H
+#define	_SPL_KMEM_H
+
+#include <sys/debug.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+
+extern int kmem_debugging(void);
+extern char *kmem_vasprintf(const char *fmt, va_list ap);
+extern char *kmem_asprintf(const char *fmt, ...);
+extern char *strdup(const char *str);
+extern void strfree(char *str);
+
+/*
+ * Memory allocation interfaces
+ */
+#define	KM_SLEEP	0x0000	/* can block for memory; success guaranteed */
+#define	KM_NOSLEEP	0x0001	/* cannot block for memory; may fail */
+#define	KM_PUSHPAGE	0x0004	/* can block for memory; may use reserve */
+#define	KM_ZERO		0x1000	/* zero the allocation */
+#define	KM_VMEM		0x2000	/* caller is vmem_* wrapper */
+
+#define	KM_PUBLIC_MASK	(KM_SLEEP | KM_NOSLEEP | KM_PUSHPAGE)
+
+static int spl_fstrans_check(void);
+
+/*
+ * Convert a KM_* flags mask to its Linux GFP_* counterpart.  The conversion
+ * function is context aware which means that KM_SLEEP allocations can be
+ * safely used in syncing contexts which have set PF_FSTRANS.
+ */
+static inline gfp_t
+kmem_flags_convert(int flags)
+{
+	gfp_t lflags = __GFP_NOWARN | __GFP_COMP;
+
+	if (flags & KM_NOSLEEP) {
+		lflags |= GFP_ATOMIC | __GFP_NORETRY;
+	} else {
+		lflags |= GFP_KERNEL;
+		if (spl_fstrans_check())
+			lflags &= ~(__GFP_IO|__GFP_FS);
+	}
+
+	if (flags & KM_PUSHPAGE)
+		lflags |= __GFP_HIGH;
+
+	if (flags & KM_ZERO)
+		lflags |= __GFP_ZERO;
+
+	return (lflags);
+}
+
+typedef struct {
+	struct task_struct *fstrans_thread;
+	unsigned int saved_flags;
+} fstrans_cookie_t;
+
+/*
+ * Introduced in Linux 3.9, however this cannot be solely relied on before
+ * Linux 3.18 as it doesn't turn off __GFP_FS as it should.
+ */
+#ifdef PF_MEMALLOC_NOIO
+#define	__SPL_PF_MEMALLOC_NOIO (PF_MEMALLOC_NOIO)
+#else
+#define	__SPL_PF_MEMALLOC_NOIO (0)
+#endif
+
+/*
+ * PF_FSTRANS is removed from Linux 4.12
+ */
+#ifdef PF_FSTRANS
+#define	__SPL_PF_FSTRANS (PF_FSTRANS)
+#else
+#define	__SPL_PF_FSTRANS (0)
+#endif
+
+#define	SPL_FSTRANS (__SPL_PF_FSTRANS|__SPL_PF_MEMALLOC_NOIO)
+
+static inline fstrans_cookie_t
+spl_fstrans_mark(void)
+{
+	fstrans_cookie_t cookie;
+
+	BUILD_BUG_ON(SPL_FSTRANS == 0);
+
+	cookie.fstrans_thread = current;
+	cookie.saved_flags = current->flags & SPL_FSTRANS;
+	current->flags |= SPL_FSTRANS;
+
+	return (cookie);
+}
+
+static inline void
+spl_fstrans_unmark(fstrans_cookie_t cookie)
+{
+	ASSERT3P(cookie.fstrans_thread, ==, current);
+	ASSERT((current->flags & SPL_FSTRANS) == SPL_FSTRANS);
+
+	current->flags &= ~SPL_FSTRANS;
+	current->flags |= cookie.saved_flags;
+}
+
+static inline int
+spl_fstrans_check(void)
+{
+	return (current->flags & SPL_FSTRANS);
+}
+
+/*
+ * specifically used to check PF_FSTRANS flag, cannot be relied on for
+ * checking spl_fstrans_mark().
+ */
+static inline int
+__spl_pf_fstrans_check(void)
+{
+	return (current->flags & __SPL_PF_FSTRANS);
+}
+
+#ifdef HAVE_ATOMIC64_T
+#define	kmem_alloc_used_add(size)	atomic64_add(size, &kmem_alloc_used)
+#define	kmem_alloc_used_sub(size)	atomic64_sub(size, &kmem_alloc_used)
+#define	kmem_alloc_used_read()		atomic64_read(&kmem_alloc_used)
+#define	kmem_alloc_used_set(size)	atomic64_set(&kmem_alloc_used, size)
+extern atomic64_t kmem_alloc_used;
+extern unsigned long long kmem_alloc_max;
+#else  /* HAVE_ATOMIC64_T */
+#define	kmem_alloc_used_add(size)	atomic_add(size, &kmem_alloc_used)
+#define	kmem_alloc_used_sub(size)	atomic_sub(size, &kmem_alloc_used)
+#define	kmem_alloc_used_read()		atomic_read(&kmem_alloc_used)
+#define	kmem_alloc_used_set(size)	atomic_set(&kmem_alloc_used, size)
+extern atomic_t kmem_alloc_used;
+extern unsigned long long kmem_alloc_max;
+#endif /* HAVE_ATOMIC64_T */
+
+extern unsigned int spl_kmem_alloc_warn;
+extern unsigned int spl_kmem_alloc_max;
+
+#define	kmem_alloc(sz, fl)	spl_kmem_alloc((sz), (fl), __func__, __LINE__)
+#define	kmem_zalloc(sz, fl)	spl_kmem_zalloc((sz), (fl), __func__, __LINE__)
+#define	kmem_free(ptr, sz)	spl_kmem_free((ptr), (sz))
+
+extern void *spl_kmem_alloc(size_t sz, int fl, const char *func, int line);
+extern void *spl_kmem_zalloc(size_t sz, int fl, const char *func, int line);
+extern void spl_kmem_free(const void *ptr, size_t sz);
+
+/*
+ * The following functions are only available for internal use.
+ */
+extern void *spl_kmem_alloc_impl(size_t size, int flags, int node);
+extern void *spl_kmem_alloc_debug(size_t size, int flags, int node);
+extern void *spl_kmem_alloc_track(size_t size, int flags,
+    const char *func, int line, int node);
+extern void spl_kmem_free_impl(const void *buf, size_t size);
+extern void spl_kmem_free_debug(const void *buf, size_t size);
+extern void spl_kmem_free_track(const void *buf, size_t size);
+
+extern int spl_kmem_init(void);
+extern void spl_kmem_fini(void);
+
+#endif	/* _SPL_KMEM_H */
diff --git a/include/spl/sys/kmem_cache.h b/include/spl/sys/kmem_cache.h
new file mode 100644
index 000000000..8fa14f67e
--- /dev/null
+++ b/include/spl/sys/kmem_cache.h
@@ -0,0 +1,240 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_KMEM_CACHE_H
+#define	_SPL_KMEM_CACHE_H
+
+#include <sys/taskq.h>
+
+/*
+ * Slab allocation interfaces.  The SPL slab differs from the standard
+ * Linux SLAB or SLUB primarily in that each cache may be backed by slabs
+ * allocated from the physical or virtal memory address space.  The virtual
+ * slabs allow for good behavior when allocation large objects of identical
+ * size.  This slab implementation also supports both constructors and
+ * destructors which the Linux slab does not.
+ */
+enum {
+	KMC_BIT_NOTOUCH		= 0,	/* Don't update ages */
+	KMC_BIT_NODEBUG		= 1,	/* Default behavior */
+	KMC_BIT_NOMAGAZINE	= 2,	/* XXX: Unsupported */
+	KMC_BIT_NOHASH		= 3,	/* XXX: Unsupported */
+	KMC_BIT_QCACHE		= 4,	/* XXX: Unsupported */
+	KMC_BIT_KMEM		= 5,	/* Use kmem cache */
+	KMC_BIT_VMEM		= 6,	/* Use vmem cache */
+	KMC_BIT_SLAB		= 7,	/* Use Linux slab cache */
+	KMC_BIT_OFFSLAB		= 8,	/* Objects not on slab */
+	KMC_BIT_NOEMERGENCY	= 9,	/* Disable emergency objects */
+	KMC_BIT_DEADLOCKED	= 14,	/* Deadlock detected */
+	KMC_BIT_GROWING		= 15,	/* Growing in progress */
+	KMC_BIT_REAPING		= 16,	/* Reaping in progress */
+	KMC_BIT_DESTROY		= 17,	/* Destroy in progress */
+	KMC_BIT_TOTAL		= 18,	/* Proc handler helper bit */
+	KMC_BIT_ALLOC		= 19,	/* Proc handler helper bit */
+	KMC_BIT_MAX		= 20,	/* Proc handler helper bit */
+};
+
+/* kmem move callback return values */
+typedef enum kmem_cbrc {
+	KMEM_CBRC_YES		= 0,	/* Object moved */
+	KMEM_CBRC_NO		= 1,	/* Object not moved */
+	KMEM_CBRC_LATER		= 2,	/* Object not moved, try again later */
+	KMEM_CBRC_DONT_NEED	= 3,	/* Neither object is needed */
+	KMEM_CBRC_DONT_KNOW	= 4,	/* Object unknown */
+} kmem_cbrc_t;
+
+#define	KMC_NOTOUCH		(1 << KMC_BIT_NOTOUCH)
+#define	KMC_NODEBUG		(1 << KMC_BIT_NODEBUG)
+#define	KMC_NOMAGAZINE		(1 << KMC_BIT_NOMAGAZINE)
+#define	KMC_NOHASH		(1 << KMC_BIT_NOHASH)
+#define	KMC_QCACHE		(1 << KMC_BIT_QCACHE)
+#define	KMC_KMEM		(1 << KMC_BIT_KMEM)
+#define	KMC_VMEM		(1 << KMC_BIT_VMEM)
+#define	KMC_SLAB		(1 << KMC_BIT_SLAB)
+#define	KMC_OFFSLAB		(1 << KMC_BIT_OFFSLAB)
+#define	KMC_NOEMERGENCY		(1 << KMC_BIT_NOEMERGENCY)
+#define	KMC_DEADLOCKED		(1 << KMC_BIT_DEADLOCKED)
+#define	KMC_GROWING		(1 << KMC_BIT_GROWING)
+#define	KMC_REAPING		(1 << KMC_BIT_REAPING)
+#define	KMC_DESTROY		(1 << KMC_BIT_DESTROY)
+#define	KMC_TOTAL		(1 << KMC_BIT_TOTAL)
+#define	KMC_ALLOC		(1 << KMC_BIT_ALLOC)
+#define	KMC_MAX			(1 << KMC_BIT_MAX)
+
+#define	KMC_REAP_CHUNK		INT_MAX
+#define	KMC_DEFAULT_SEEKS	1
+
+#define	KMC_EXPIRE_AGE		0x1	/* Due to age */
+#define	KMC_EXPIRE_MEM		0x2	/* Due to low memory */
+
+#define	KMC_RECLAIM_ONCE	0x1	/* Force a single shrinker pass */
+
+extern unsigned int spl_kmem_cache_expire;
+extern struct list_head spl_kmem_cache_list;
+extern struct rw_semaphore spl_kmem_cache_sem;
+
+#define	SKM_MAGIC			0x2e2e2e2e
+#define	SKO_MAGIC			0x20202020
+#define	SKS_MAGIC			0x22222222
+#define	SKC_MAGIC			0x2c2c2c2c
+
+#define	SPL_KMEM_CACHE_DELAY		15	/* Minimum slab release age */
+#define	SPL_KMEM_CACHE_REAP		0	/* Default reap everything */
+#define	SPL_KMEM_CACHE_OBJ_PER_SLAB	8	/* Target objects per slab */
+#define	SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN	1	/* Minimum objects per slab */
+#define	SPL_KMEM_CACHE_ALIGN		8	/* Default object alignment */
+#ifdef _LP64
+#define	SPL_KMEM_CACHE_MAX_SIZE		32	/* Max slab size in MB */
+#else
+#define	SPL_KMEM_CACHE_MAX_SIZE		4	/* Max slab size in MB */
+#endif
+
+#define	SPL_MAX_ORDER			(MAX_ORDER - 3)
+#define	SPL_MAX_ORDER_NR_PAGES		(1 << (SPL_MAX_ORDER - 1))
+
+#ifdef CONFIG_SLUB
+#define	SPL_MAX_KMEM_CACHE_ORDER	PAGE_ALLOC_COSTLY_ORDER
+#define	SPL_MAX_KMEM_ORDER_NR_PAGES	(1 << (SPL_MAX_KMEM_CACHE_ORDER - 1))
+#else
+#define	SPL_MAX_KMEM_ORDER_NR_PAGES	(KMALLOC_MAX_SIZE >> PAGE_SHIFT)
+#endif
+
+#define	POINTER_IS_VALID(p)		0	/* Unimplemented */
+#define	POINTER_INVALIDATE(pp)			/* Unimplemented */
+
+typedef int (*spl_kmem_ctor_t)(void *, void *, int);
+typedef void (*spl_kmem_dtor_t)(void *, void *);
+typedef void (*spl_kmem_reclaim_t)(void *);
+
+typedef struct spl_kmem_magazine {
+	uint32_t		skm_magic;	/* Sanity magic */
+	uint32_t		skm_avail;	/* Available objects */
+	uint32_t		skm_size;	/* Magazine size */
+	uint32_t		skm_refill;	/* Batch refill size */
+	struct spl_kmem_cache	*skm_cache;	/* Owned by cache */
+	unsigned long		skm_age;	/* Last cache access */
+	unsigned int		skm_cpu;	/* Owned by cpu */
+	void			*skm_objs[0];	/* Object pointers */
+} spl_kmem_magazine_t;
+
+typedef struct spl_kmem_obj {
+	uint32_t		sko_magic;	/* Sanity magic */
+	void			*sko_addr;	/* Buffer address */
+	struct spl_kmem_slab	*sko_slab;	/* Owned by slab */
+	struct list_head	sko_list;	/* Free object list linkage */
+} spl_kmem_obj_t;
+
+typedef struct spl_kmem_slab {
+	uint32_t		sks_magic;	/* Sanity magic */
+	uint32_t		sks_objs;	/* Objects per slab */
+	struct spl_kmem_cache	*sks_cache;	/* Owned by cache */
+	struct list_head	sks_list;	/* Slab list linkage */
+	struct list_head	sks_free_list;	/* Free object list */
+	unsigned long		sks_age;	/* Last modify jiffie */
+	uint32_t		sks_ref;	/* Ref count used objects */
+} spl_kmem_slab_t;
+
+typedef struct spl_kmem_alloc {
+	struct spl_kmem_cache	*ska_cache;	/* Owned by cache */
+	int			ska_flags;	/* Allocation flags */
+	taskq_ent_t		ska_tqe;	/* Task queue entry */
+} spl_kmem_alloc_t;
+
+typedef struct spl_kmem_emergency {
+	struct rb_node		ske_node;	/* Emergency tree linkage */
+	unsigned long		ske_obj;	/* Buffer address */
+} spl_kmem_emergency_t;
+
+typedef struct spl_kmem_cache {
+	uint32_t		skc_magic;	/* Sanity magic */
+	uint32_t		skc_name_size;	/* Name length */
+	char			*skc_name;	/* Name string */
+	spl_kmem_magazine_t	**skc_mag;	/* Per-CPU warm cache */
+	uint32_t		skc_mag_size;	/* Magazine size */
+	uint32_t		skc_mag_refill;	/* Magazine refill count */
+	spl_kmem_ctor_t		skc_ctor;	/* Constructor */
+	spl_kmem_dtor_t		skc_dtor;	/* Destructor */
+	spl_kmem_reclaim_t	skc_reclaim;	/* Reclaimator */
+	void			*skc_private;	/* Private data */
+	void			*skc_vmp;	/* Unused */
+	struct kmem_cache	*skc_linux_cache; /* Linux slab cache if used */
+	unsigned long		skc_flags;	/* Flags */
+	uint32_t		skc_obj_size;	/* Object size */
+	uint32_t		skc_obj_align;	/* Object alignment */
+	uint32_t		skc_slab_objs;	/* Objects per slab */
+	uint32_t		skc_slab_size;	/* Slab size */
+	uint32_t		skc_delay;	/* Slab reclaim interval */
+	uint32_t		skc_reap;	/* Slab reclaim count */
+	atomic_t		skc_ref;	/* Ref count callers */
+	taskqid_t		skc_taskqid;	/* Slab reclaim task */
+	struct list_head	skc_list;	/* List of caches linkage */
+	struct list_head	skc_complete_list; /* Completely alloc'ed */
+	struct list_head	skc_partial_list;  /* Partially alloc'ed */
+	struct rb_root		skc_emergency_tree; /* Min sized objects */
+	spinlock_t		skc_lock;	/* Cache lock */
+	spl_wait_queue_head_t	skc_waitq;	/* Allocation waiters */
+	uint64_t		skc_slab_fail;	/* Slab alloc failures */
+	uint64_t		skc_slab_create;  /* Slab creates */
+	uint64_t		skc_slab_destroy; /* Slab destroys */
+	uint64_t		skc_slab_total;	/* Slab total current */
+	uint64_t		skc_slab_alloc;	/* Slab alloc current */
+	uint64_t		skc_slab_max;	/* Slab max historic  */
+	uint64_t		skc_obj_total;	/* Obj total current */
+	uint64_t		skc_obj_alloc;	/* Obj alloc current */
+	uint64_t		skc_obj_max;	/* Obj max historic */
+	uint64_t		skc_obj_deadlock;  /* Obj emergency deadlocks */
+	uint64_t		skc_obj_emergency; /* Obj emergency current */
+	uint64_t		skc_obj_emergency_max; /* Obj emergency max */
+} spl_kmem_cache_t;
+#define	kmem_cache_t		spl_kmem_cache_t
+
+extern spl_kmem_cache_t *spl_kmem_cache_create(char *name, size_t size,
+    size_t align, spl_kmem_ctor_t ctor, spl_kmem_dtor_t dtor,
+    spl_kmem_reclaim_t reclaim, void *priv, void *vmp, int flags);
+extern void spl_kmem_cache_set_move(spl_kmem_cache_t *,
+    kmem_cbrc_t (*)(void *, void *, size_t, void *));
+extern void spl_kmem_cache_destroy(spl_kmem_cache_t *skc);
+extern void *spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags);
+extern void spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj);
+extern void spl_kmem_cache_set_allocflags(spl_kmem_cache_t *skc, gfp_t flags);
+extern void spl_kmem_cache_reap_now(spl_kmem_cache_t *skc, int count);
+extern void spl_kmem_reap(void);
+
+#define	kmem_cache_create(name, size, align, ctor, dtor, rclm, priv, vmp, fl) \
+    spl_kmem_cache_create(name, size, align, ctor, dtor, rclm, priv, vmp, fl)
+#define	kmem_cache_set_move(skc, move)	spl_kmem_cache_set_move(skc, move)
+#define	kmem_cache_destroy(skc)		spl_kmem_cache_destroy(skc)
+#define	kmem_cache_alloc(skc, flags)	spl_kmem_cache_alloc(skc, flags)
+#define	kmem_cache_free(skc, obj)	spl_kmem_cache_free(skc, obj)
+#define	kmem_cache_reap_now(skc)	\
+    spl_kmem_cache_reap_now(skc, skc->skc_reap)
+#define	kmem_reap()			spl_kmem_reap()
+
+/*
+ * The following functions are only available for internal use.
+ */
+extern int spl_kmem_cache_init(void);
+extern void spl_kmem_cache_fini(void);
+
+#endif	/* _SPL_KMEM_CACHE_H */
diff --git a/include/spl/sys/kobj.h b/include/spl/sys/kobj.h
new file mode 100644
index 000000000..558ec39a8
--- /dev/null
+++ b/include/spl/sys/kobj.h
@@ -0,0 +1,42 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_KOBJ_H
+#define	_SPL_KOBJ_H
+
+#include <sys/vnode.h>
+
+typedef struct _buf {
+	vnode_t *vp;
+} _buf_t;
+
+typedef struct _buf buf_t;
+
+extern struct _buf *kobj_open_file(const char *name);
+extern void kobj_close_file(struct _buf *file);
+extern int kobj_read_file(struct _buf *file, char *buf, unsigned size,
+    unsigned off);
+extern int kobj_get_filesize(struct _buf *file, uint64_t *size);
+
+#endif /* SPL_KOBJ_H */
diff --git a/include/spl/sys/kstat.h b/include/spl/sys/kstat.h
new file mode 100644
index 000000000..9170fe24e
--- /dev/null
+++ b/include/spl/sys/kstat.h
@@ -0,0 +1,208 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_KSTAT_H
+#define	_SPL_KSTAT_H
+
+#include <linux/module.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/kmem.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+
+#define	KSTAT_STRLEN		255
+#define	KSTAT_RAW_MAX		(128*1024)
+
+/*
+ * For reference valid classes are:
+ * disk, tape, net, controller, vm, kvm, hat, streams, kstat, misc
+ */
+
+#define	KSTAT_TYPE_RAW		0 /* can be anything; ks_ndata >= 1 */
+#define	KSTAT_TYPE_NAMED	1 /* name/value pair; ks_ndata >= 1 */
+#define	KSTAT_TYPE_INTR		2 /* interrupt stats; ks_ndata == 1 */
+#define	KSTAT_TYPE_IO		3 /* I/O stats; ks_ndata == 1 */
+#define	KSTAT_TYPE_TIMER	4 /* event timer; ks_ndata >= 1 */
+#define	KSTAT_NUM_TYPES		5
+
+#define	KSTAT_DATA_CHAR		0
+#define	KSTAT_DATA_INT32	1
+#define	KSTAT_DATA_UINT32	2
+#define	KSTAT_DATA_INT64	3
+#define	KSTAT_DATA_UINT64	4
+#define	KSTAT_DATA_LONG		5
+#define	KSTAT_DATA_ULONG	6
+#define	KSTAT_DATA_STRING	7
+#define	KSTAT_NUM_DATAS		8
+
+#define	KSTAT_INTR_HARD		0
+#define	KSTAT_INTR_SOFT		1
+#define	KSTAT_INTR_WATCHDOG	2
+#define	KSTAT_INTR_SPURIOUS	3
+#define	KSTAT_INTR_MULTSVC	4
+#define	KSTAT_NUM_INTRS		5
+
+#define	KSTAT_FLAG_VIRTUAL	0x01
+#define	KSTAT_FLAG_VAR_SIZE	0x02
+#define	KSTAT_FLAG_WRITABLE	0x04
+#define	KSTAT_FLAG_PERSISTENT	0x08
+#define	KSTAT_FLAG_DORMANT	0x10
+#define	KSTAT_FLAG_UNSUPPORTED	\
+	(KSTAT_FLAG_VAR_SIZE | KSTAT_FLAG_WRITABLE | \
+	KSTAT_FLAG_PERSISTENT | KSTAT_FLAG_DORMANT)
+
+
+#define	KS_MAGIC		0x9d9d9d9d
+
+/* Dynamic updates */
+#define	KSTAT_READ		0
+#define	KSTAT_WRITE		1
+
+struct kstat_s;
+typedef struct kstat_s kstat_t;
+
+typedef int kid_t;				/* unique kstat id */
+typedef int kstat_update_t(struct kstat_s *, int); /* dynamic update cb */
+
+typedef struct kstat_module {
+	char ksm_name[KSTAT_STRLEN+1];		/* module name */
+	struct list_head ksm_module_list;	/* module linkage */
+	struct list_head ksm_kstat_list;	/* list of kstat entries */
+	struct proc_dir_entry *ksm_proc;	/* proc entry */
+} kstat_module_t;
+
+typedef struct kstat_raw_ops {
+	int (*headers)(char *buf, size_t size);
+	int (*data)(char *buf, size_t size, void *data);
+	void *(*addr)(kstat_t *ksp, loff_t index);
+} kstat_raw_ops_t;
+
+struct kstat_s {
+	int		ks_magic;		/* magic value */
+	kid_t		ks_kid;			/* unique kstat ID */
+	hrtime_t	ks_crtime;		/* creation time */
+	hrtime_t	ks_snaptime;		/* last access time */
+	char		ks_module[KSTAT_STRLEN+1]; /* provider module name */
+	int		ks_instance;		/* provider module instance */
+	char		ks_name[KSTAT_STRLEN+1]; /* kstat name */
+	char		ks_class[KSTAT_STRLEN+1]; /* kstat class */
+	uchar_t		ks_type;		/* kstat data type */
+	uchar_t		ks_flags;		/* kstat flags */
+	void		*ks_data;		/* kstat type-specific data */
+	uint_t		ks_ndata;		/* # of data records */
+	size_t		ks_data_size;		/* size of kstat data section */
+	struct proc_dir_entry *ks_proc;		/* proc linkage */
+	kstat_update_t	*ks_update;		/* dynamic updates */
+	void		*ks_private;		/* private data */
+	kmutex_t	ks_private_lock;	/* kstat private data lock */
+	kmutex_t	*ks_lock;		/* kstat data lock */
+	struct list_head ks_list;		/* kstat linkage */
+	kstat_module_t	*ks_owner;		/* kstat module linkage */
+	kstat_raw_ops_t	ks_raw_ops;		/* ops table for raw type */
+	char		*ks_raw_buf;		/* buf used for raw ops */
+	size_t		ks_raw_bufsize;		/* size of raw ops buffer */
+};
+
+typedef struct kstat_named_s {
+	char	name[KSTAT_STRLEN];	/* name of counter */
+	uchar_t	data_type;		/* data type */
+	union {
+		char c[16];	/* 128-bit int */
+		int32_t	i32;	/* 32-bit signed int */
+		uint32_t ui32;	/* 32-bit unsigned int */
+		int64_t i64;	/* 64-bit signed int */
+		uint64_t ui64;	/* 64-bit unsigned int */
+		long l;		/* native signed long */
+		ulong_t ul;	/* native unsigned long */
+		struct {
+			union {
+				char *ptr;	/* NULL-term string */
+				char __pad[8];	/* 64-bit padding */
+			} addr;
+			uint32_t len;		/* # bytes for strlen + '\0' */
+		} string;
+	} value;
+} kstat_named_t;
+
+#define	KSTAT_NAMED_STR_PTR(knptr) ((knptr)->value.string.addr.ptr)
+#define	KSTAT_NAMED_STR_BUFLEN(knptr) ((knptr)->value.string.len)
+
+typedef struct kstat_intr {
+	uint_t intrs[KSTAT_NUM_INTRS];
+} kstat_intr_t;
+
+typedef struct kstat_io {
+	u_longlong_t	nread;		/* number of bytes read */
+	u_longlong_t	nwritten;	/* number of bytes written */
+	uint_t		reads;		/* number of read operations */
+	uint_t		writes;		/* number of write operations */
+	hrtime_t	wtime;		/* cumulative wait (pre-service) time */
+	hrtime_t	wlentime;	/* cumulative wait len*time product */
+	hrtime_t	wlastupdate;	/* last time wait queue changed */
+	hrtime_t	rtime;		/* cumulative run (service) time */
+	hrtime_t	rlentime;	/* cumulative run length*time product */
+	hrtime_t	rlastupdate;	/* last time run queue changed */
+	uint_t		wcnt;		/* count of elements in wait state */
+	uint_t		rcnt;		/* count of elements in run state */
+} kstat_io_t;
+
+typedef struct kstat_timer {
+	char		name[KSTAT_STRLEN+1]; /* event name */
+	u_longlong_t	num_events;	 /* number of events */
+	hrtime_t	elapsed_time;	 /* cumulative elapsed time */
+	hrtime_t	min_time;	 /* shortest event duration */
+	hrtime_t	max_time;	 /* longest event duration */
+	hrtime_t	start_time;	 /* previous event start time */
+	hrtime_t	stop_time;	 /* previous event stop time */
+} kstat_timer_t;
+
+int spl_kstat_init(void);
+void spl_kstat_fini(void);
+
+extern void __kstat_set_raw_ops(kstat_t *ksp,
+    int (*headers)(char *buf, size_t size),
+    int (*data)(char *buf, size_t size, void *data),
+    void* (*addr)(kstat_t *ksp, loff_t index));
+
+extern kstat_t *__kstat_create(const char *ks_module, int ks_instance,
+    const char *ks_name, const char *ks_class, uchar_t ks_type,
+    uint_t ks_ndata, uchar_t ks_flags);
+
+extern void __kstat_install(kstat_t *ksp);
+extern void __kstat_delete(kstat_t *ksp);
+extern void kstat_waitq_enter(kstat_io_t *);
+extern void kstat_waitq_exit(kstat_io_t *);
+extern void kstat_runq_enter(kstat_io_t *);
+extern void kstat_runq_exit(kstat_io_t *);
+
+#define	kstat_set_raw_ops(k, h, d, a) \
+    __kstat_set_raw_ops(k, h, d, a)
+#define	kstat_create(m, i, n, c, t, s, f) \
+    __kstat_create(m, i, n, c, t, s, f)
+
+#define	kstat_install(k)		__kstat_install(k)
+#define	kstat_delete(k)			__kstat_delete(k)
+
+#endif  /* _SPL_KSTAT_H */
diff --git a/include/spl/sys/list.h b/include/spl/sys/list.h
new file mode 100644
index 000000000..74b784e93
--- /dev/null
+++ b/include/spl/sys/list.h
@@ -0,0 +1,208 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_LIST_H
+#define	_SPL_LIST_H
+
+#include <sys/types.h>
+#include <linux/list.h>
+
+/*
+ * NOTE: I have implemented the Solaris list API in terms of the native
+ * linux API.  This has certain advantages in terms of leveraging the linux
+ * list debugging infrastructure, but it also means that the internals of a
+ * list differ slightly than on Solaris.  This is not a problem as long as
+ * all callers stick to the published API.  The two major differences are:
+ *
+ * 1) A list_node_t is mapped to a linux list_head struct which changes
+ *    the name of the list_next/list_prev pointers to next/prev respectively.
+ *
+ * 2) A list_node_t which is not attached to a list on Solaris is denoted
+ *    by having its list_next/list_prev pointers set to NULL.  Under linux
+ *    the next/prev pointers are set to LIST_POISON1 and LIST_POISON2
+ *    respectively.  At this moment this only impacts the implementation
+ *    of the list_link_init() and list_link_active() functions.
+ */
+
+typedef struct list_head list_node_t;
+
+typedef struct list {
+	size_t list_size;
+	size_t list_offset;
+	list_node_t list_head;
+} list_t;
+
+#define	list_d2l(a, obj) ((list_node_t *)(((char *)obj) + (a)->list_offset))
+#define	list_object(a, node) ((void *)(((char *)node) - (a)->list_offset))
+
+static inline int
+list_is_empty(list_t *list)
+{
+	return (list_empty(&list->list_head));
+}
+
+static inline void
+list_link_init(list_node_t *node)
+{
+	node->next = LIST_POISON1;
+	node->prev = LIST_POISON2;
+}
+
+static inline void
+list_create(list_t *list, size_t size, size_t offset)
+{
+	list->list_size = size;
+	list->list_offset = offset;
+	INIT_LIST_HEAD(&list->list_head);
+}
+
+static inline void
+list_destroy(list_t *list)
+{
+	list_del(&list->list_head);
+}
+
+static inline void
+list_insert_head(list_t *list, void *object)
+{
+	list_add(list_d2l(list, object), &list->list_head);
+}
+
+static inline void
+list_insert_tail(list_t *list, void *object)
+{
+	list_add_tail(list_d2l(list, object), &list->list_head);
+}
+
+static inline void
+list_insert_after(list_t *list, void *object, void *nobject)
+{
+	if (object == NULL)
+		list_insert_head(list, nobject);
+	else
+		list_add(list_d2l(list, nobject), list_d2l(list, object));
+}
+
+static inline void
+list_insert_before(list_t *list, void *object, void *nobject)
+{
+	if (object == NULL)
+		list_insert_tail(list, nobject);
+	else
+		list_add_tail(list_d2l(list, nobject), list_d2l(list, object));
+}
+
+static inline void
+list_remove(list_t *list, void *object)
+{
+	list_del(list_d2l(list, object));
+}
+
+static inline void *
+list_remove_head(list_t *list)
+{
+	list_node_t *head = list->list_head.next;
+	if (head == &list->list_head)
+		return (NULL);
+
+	list_del(head);
+	return (list_object(list, head));
+}
+
+static inline void *
+list_remove_tail(list_t *list)
+{
+	list_node_t *tail = list->list_head.prev;
+	if (tail == &list->list_head)
+		return (NULL);
+
+	list_del(tail);
+	return (list_object(list, tail));
+}
+
+static inline void *
+list_head(list_t *list)
+{
+	if (list_is_empty(list))
+		return (NULL);
+
+	return (list_object(list, list->list_head.next));
+}
+
+static inline void *
+list_tail(list_t *list)
+{
+	if (list_is_empty(list))
+		return (NULL);
+
+	return (list_object(list, list->list_head.prev));
+}
+
+static inline void *
+list_next(list_t *list, void *object)
+{
+	list_node_t *node = list_d2l(list, object);
+
+	if (node->next != &list->list_head)
+		return (list_object(list, node->next));
+
+	return (NULL);
+}
+
+static inline void *
+list_prev(list_t *list, void *object)
+{
+	list_node_t *node = list_d2l(list, object);
+
+	if (node->prev != &list->list_head)
+		return (list_object(list, node->prev));
+
+	return (NULL);
+}
+
+static inline int
+list_link_active(list_node_t *node)
+{
+	return (node->next != LIST_POISON1) && (node->prev != LIST_POISON2);
+}
+
+static inline void
+spl_list_move_tail(list_t *dst, list_t *src)
+{
+	list_splice_init(&src->list_head, dst->list_head.prev);
+}
+
+#define	list_move_tail(dst, src)	spl_list_move_tail(dst, src)
+
+static inline void
+list_link_replace(list_node_t *old_node, list_node_t *new_node)
+{
+	new_node->next = old_node->next;
+	new_node->prev = old_node->prev;
+	old_node->prev->next = new_node;
+	old_node->next->prev = new_node;
+	list_link_init(old_node);
+}
+
+#endif /* SPL_LIST_H */
diff --git a/include/spl/sys/mode.h b/include/spl/sys/mode.h
new file mode 100644
index 000000000..02802d0d4
--- /dev/null
+++ b/include/spl/sys/mode.h
@@ -0,0 +1,32 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_MODE_H
+#define	_SPL_MODE_H
+
+#define	IFTOVT(mode)	vn_mode_to_vtype(mode)
+#define	VTTOIF(vtype)	vn_vtype_to_mode(vtype)
+#define	MAKEIMODE(T, M) (VTTOIF(T) | ((M) & ~S_IFMT))
+
+#endif /* SPL_MODE_H */
diff --git a/include/spl/sys/mutex.h b/include/spl/sys/mutex.h
new file mode 100644
index 000000000..f906d49d4
--- /dev/null
+++ b/include/spl/sys/mutex.h
@@ -0,0 +1,184 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_MUTEX_H
+#define	_SPL_MUTEX_H
+
+#include <sys/types.h>
+#include <linux/mutex.h>
+#include <linux/lockdep.h>
+
+typedef enum {
+	MUTEX_DEFAULT	= 0,
+	MUTEX_SPIN	= 1,
+	MUTEX_ADAPTIVE	= 2,
+	MUTEX_NOLOCKDEP	= 3
+} kmutex_type_t;
+
+typedef struct {
+	struct mutex		m_mutex;
+	spinlock_t		m_lock;	/* used for serializing mutex_exit */
+	kthread_t		*m_owner;
+#ifdef CONFIG_LOCKDEP
+	kmutex_type_t		m_type;
+#endif /* CONFIG_LOCKDEP */
+} kmutex_t;
+
+#define	MUTEX(mp)		(&((mp)->m_mutex))
+
+static inline void
+spl_mutex_set_owner(kmutex_t *mp)
+{
+	mp->m_owner = current;
+}
+
+static inline void
+spl_mutex_clear_owner(kmutex_t *mp)
+{
+	mp->m_owner = NULL;
+}
+
+#define	mutex_owner(mp)		(ACCESS_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))
+
+#ifdef CONFIG_LOCKDEP
+static inline void
+spl_mutex_set_type(kmutex_t *mp, kmutex_type_t type)
+{
+	mp->m_type = type;
+}
+static inline void
+spl_mutex_lockdep_off_maybe(kmutex_t *mp)			\
+{								\
+	if (mp && mp->m_type == MUTEX_NOLOCKDEP)		\
+		lockdep_off();					\
+}
+static inline void
+spl_mutex_lockdep_on_maybe(kmutex_t *mp)			\
+{								\
+	if (mp && mp->m_type == MUTEX_NOLOCKDEP)		\
+		lockdep_on();					\
+}
+#else  /* CONFIG_LOCKDEP */
+#define	spl_mutex_set_type(mp, type)
+#define	spl_mutex_lockdep_off_maybe(mp)
+#define	spl_mutex_lockdep_on_maybe(mp)
+#endif /* CONFIG_LOCKDEP */
+
+/*
+ * The following functions must be a #define	and not static inline.
+ * This ensures that the native linux mutex functions (lock/unlock)
+ * will be correctly located in the users code which is important
+ * for the built in kernel lock analysis tools
+ */
+#undef mutex_init
+#define	mutex_init(mp, name, type, ibc)				\
+{								\
+	static struct lock_class_key __key;			\
+	ASSERT(type == MUTEX_DEFAULT || type == MUTEX_NOLOCKDEP); \
+								\
+	__mutex_init(MUTEX(mp), (name) ? (#name) : (#mp), &__key); \
+	spin_lock_init(&(mp)->m_lock);				\
+	spl_mutex_clear_owner(mp);				\
+	spl_mutex_set_type(mp, type);				\
+}
+
+#undef mutex_destroy
+#define	mutex_destroy(mp)					\
+{								\
+	VERIFY3P(mutex_owner(mp), ==, NULL);			\
+}
+
+/* BEGIN CSTYLED */
+#define	mutex_tryenter(mp)					\
+({								\
+	int _rc_;						\
+								\
+	spl_mutex_lockdep_off_maybe(mp);			\
+	if ((_rc_ = mutex_trylock(MUTEX(mp))) == 1)		\
+		spl_mutex_set_owner(mp);			\
+	spl_mutex_lockdep_on_maybe(mp);				\
+								\
+	_rc_;							\
+})
+/* END CSTYLED */
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+#define	mutex_enter_nested(mp, subclass)			\
+{								\
+	ASSERT3P(mutex_owner(mp), !=, current);			\
+	spl_mutex_lockdep_off_maybe(mp);			\
+	mutex_lock_nested(MUTEX(mp), (subclass));		\
+	spl_mutex_lockdep_on_maybe(mp);				\
+	spl_mutex_set_owner(mp);				\
+}
+#else /* CONFIG_DEBUG_LOCK_ALLOC */
+#define	mutex_enter_nested(mp, subclass)			\
+{								\
+	ASSERT3P(mutex_owner(mp), !=, current);			\
+	spl_mutex_lockdep_off_maybe(mp);			\
+	mutex_lock(MUTEX(mp));					\
+	spl_mutex_lockdep_on_maybe(mp);				\
+	spl_mutex_set_owner(mp);				\
+}
+#endif /*  CONFIG_DEBUG_LOCK_ALLOC */
+
+#define	mutex_enter(mp) mutex_enter_nested((mp), 0)
+
+/*
+ * The reason for the spinlock:
+ *
+ * The Linux mutex is designed with a fast-path/slow-path design such that it
+ * does not guarantee serialization upon itself, allowing a race where latter
+ * acquirers finish mutex_unlock before former ones.
+ *
+ * The race renders it unsafe to be used for serializing the freeing of an
+ * object in which the mutex is embedded, where the latter acquirer could go
+ * on to free the object while the former one is still doing mutex_unlock and
+ * causing memory corruption.
+ *
+ * However, there are many places in ZFS where the mutex is used for
+ * serializing object freeing, and the code is shared among other OSes without
+ * this issue. Thus, we need the spinlock to force the serialization on
+ * mutex_exit().
+ *
+ * See http://lwn.net/Articles/575477/ for the information about the race.
+ */
+#define	mutex_exit(mp)						\
+{								\
+	spl_mutex_clear_owner(mp);				\
+	spin_lock(&(mp)->m_lock);				\
+	spl_mutex_lockdep_off_maybe(mp);			\
+	mutex_unlock(MUTEX(mp));				\
+	spl_mutex_lockdep_on_maybe(mp);				\
+	spin_unlock(&(mp)->m_lock);				\
+	/* NOTE: do not dereference mp after this point */	\
+}
+
+int spl_mutex_init(void);
+void spl_mutex_fini(void);
+
+#endif /* _SPL_MUTEX_H */
diff --git a/include/spl/sys/param.h b/include/spl/sys/param.h
new file mode 100644
index 000000000..4ef929151
--- /dev/null
+++ b/include/spl/sys/param.h
@@ -0,0 +1,36 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_PARAM_H
+#define	_SPL_PARAM_H
+
+#include <asm/page.h>
+
+/* Pages to bytes and back */
+#define	ptob(pages)			((pages) << PAGE_SHIFT)
+#define	btop(bytes)			((bytes) >> PAGE_SHIFT)
+
+#define	MAXUID				UINT32_MAX
+
+#endif /* SPL_PARAM_H */
diff --git a/include/spl/sys/proc.h b/include/spl/sys/proc.h
new file mode 100644
index 000000000..287683920
--- /dev/null
+++ b/include/spl/sys/proc.h
@@ -0,0 +1,35 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_PROC_H
+#define	_SPL_PROC_H
+
+#include <linux/proc_fs.h>
+
+extern struct proc_dir_entry *proc_spl_kstat;
+
+int spl_proc_init(void);
+void spl_proc_fini(void);
+
+#endif /* SPL_PROC_H */
diff --git a/include/spl/sys/processor.h b/include/spl/sys/processor.h
new file mode 100644
index 000000000..a70101fa2
--- /dev/null
+++ b/include/spl/sys/processor.h
@@ -0,0 +1,32 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef	_SPL_PROCESSOR_H
+#define	_SPL_PROCESSOR_H
+
+#define	getcpuid() smp_processor_id()
+
+typedef int	processorid_t;
+
+#endif /* _SPL_PROCESSOR_H */
diff --git a/include/spl/sys/random.h b/include/spl/sys/random.h
new file mode 100644
index 000000000..93e244f56
--- /dev/null
+++ b/include/spl/sys/random.h
@@ -0,0 +1,40 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_RANDOM_H
+#define	_SPL_RANDOM_H
+
+#include <linux/module.h>
+#include <linux/random.h>
+
+static __inline__ int
+random_get_bytes(uint8_t *ptr, size_t len)
+{
+	get_random_bytes((void *)ptr, (int)len);
+	return (0);
+}
+
+extern int random_get_pseudo_bytes(uint8_t *ptr, size_t len);
+
+#endif	/* _SPL_RANDOM_H */
diff --git a/include/spl/sys/rwlock.h b/include/spl/sys/rwlock.h
new file mode 100644
index 000000000..b44ceab66
--- /dev/null
+++ b/include/spl/sys/rwlock.h
@@ -0,0 +1,273 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_RWLOCK_H
+#define	_SPL_RWLOCK_H
+
+#include <sys/types.h>
+#include <linux/rwsem.h>
+
+/* Linux kernel compatibility */
+#if defined(CONFIG_PREEMPT_RT_FULL)
+#define	SPL_RWSEM_SINGLE_READER_VALUE	(1)
+#define	SPL_RWSEM_SINGLE_WRITER_VALUE	(0)
+#elif defined(CONFIG_RWSEM_GENERIC_SPINLOCK)
+#define	SPL_RWSEM_SINGLE_READER_VALUE	(1)
+#define	SPL_RWSEM_SINGLE_WRITER_VALUE	(-1)
+#else
+#define	SPL_RWSEM_SINGLE_READER_VALUE	(RWSEM_ACTIVE_READ_BIAS)
+#define	SPL_RWSEM_SINGLE_WRITER_VALUE	(RWSEM_ACTIVE_WRITE_BIAS)
+#endif
+
+/* Linux 3.16 changed activity to count for rwsem-spinlock */
+#if defined(CONFIG_PREEMPT_RT_FULL)
+#define	RWSEM_COUNT(sem)	sem->read_depth
+#elif defined(HAVE_RWSEM_ACTIVITY)
+#define	RWSEM_COUNT(sem)	sem->activity
+/* Linux 4.8 changed count to an atomic_long_t for !rwsem-spinlock */
+#elif defined(HAVE_RWSEM_ATOMIC_LONG_COUNT)
+#define	RWSEM_COUNT(sem)	atomic_long_read(&(sem)->count)
+#else
+#define	RWSEM_COUNT(sem)	sem->count
+#endif
+
+#if defined(RWSEM_SPINLOCK_IS_RAW)
+#define	spl_rwsem_lock_irqsave(lk, fl)		raw_spin_lock_irqsave(lk, fl)
+#define	spl_rwsem_unlock_irqrestore(lk, fl)	\
+    raw_spin_unlock_irqrestore(lk, fl)
+#define	spl_rwsem_trylock_irqsave(lk, fl)	raw_spin_trylock_irqsave(lk, fl)
+#else
+#define	spl_rwsem_lock_irqsave(lk, fl)		spin_lock_irqsave(lk, fl)
+#define	spl_rwsem_unlock_irqrestore(lk, fl)	spin_unlock_irqrestore(lk, fl)
+#define	spl_rwsem_trylock_irqsave(lk, fl)	spin_trylock_irqsave(lk, fl)
+#endif /* RWSEM_SPINLOCK_IS_RAW */
+
+#define	spl_rwsem_is_locked(rwsem)		rwsem_is_locked(rwsem)
+
+typedef enum {
+	RW_DRIVER	= 2,
+	RW_DEFAULT	= 4,
+	RW_NOLOCKDEP	= 5
+} krw_type_t;
+
+typedef enum {
+	RW_NONE		= 0,
+	RW_WRITER	= 1,
+	RW_READER	= 2
+} krw_t;
+
+/*
+ * If CONFIG_RWSEM_SPIN_ON_OWNER is defined, rw_semaphore will have an owner
+ * field, so we don't need our own.
+ */
+typedef struct {
+	struct rw_semaphore rw_rwlock;
+#ifndef CONFIG_RWSEM_SPIN_ON_OWNER
+	kthread_t *rw_owner;
+#endif
+#ifdef CONFIG_LOCKDEP
+	krw_type_t	rw_type;
+#endif /* CONFIG_LOCKDEP */
+} krwlock_t;
+
+#define	SEM(rwp)	(&(rwp)->rw_rwlock)
+
+static inline void
+spl_rw_set_owner(krwlock_t *rwp)
+{
+/*
+ * If CONFIG_RWSEM_SPIN_ON_OWNER is defined, down_write, up_write,
+ * downgrade_write and __init_rwsem will set/clear owner for us.
+ */
+#ifndef CONFIG_RWSEM_SPIN_ON_OWNER
+	rwp->rw_owner = current;
+#endif
+}
+
+static inline void
+spl_rw_clear_owner(krwlock_t *rwp)
+{
+#ifndef CONFIG_RWSEM_SPIN_ON_OWNER
+	rwp->rw_owner = NULL;
+#endif
+}
+
+static inline kthread_t *
+rw_owner(krwlock_t *rwp)
+{
+#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
+	return (SEM(rwp)->owner);
+#else
+	return (rwp->rw_owner);
+#endif
+}
+
+#ifdef CONFIG_LOCKDEP
+static inline void
+spl_rw_set_type(krwlock_t *rwp, krw_type_t type)
+{
+	rwp->rw_type = type;
+}
+static inline void
+spl_rw_lockdep_off_maybe(krwlock_t *rwp)		\
+{							\
+	if (rwp && rwp->rw_type == RW_NOLOCKDEP)	\
+		lockdep_off();				\
+}
+static inline void
+spl_rw_lockdep_on_maybe(krwlock_t *rwp)			\
+{							\
+	if (rwp && rwp->rw_type == RW_NOLOCKDEP)	\
+		lockdep_on();				\
+}
+#else  /* CONFIG_LOCKDEP */
+#define	spl_rw_set_type(rwp, type)
+#define	spl_rw_lockdep_off_maybe(rwp)
+#define	spl_rw_lockdep_on_maybe(rwp)
+#endif /* CONFIG_LOCKDEP */
+
+static inline int
+RW_READ_HELD(krwlock_t *rwp)
+{
+	/*
+	 * Linux 4.8 will set owner to 1 when read held instead of leave it
+	 * NULL. So we check whether owner <= 1.
+	 */
+	return (spl_rwsem_is_locked(SEM(rwp)) &&
+	    (unsigned long)rw_owner(rwp) <= 1);
+}
+
+static inline int
+RW_WRITE_HELD(krwlock_t *rwp)
+{
+	return (rw_owner(rwp) == current);
+}
+
+static inline int
+RW_LOCK_HELD(krwlock_t *rwp)
+{
+	return (spl_rwsem_is_locked(SEM(rwp)));
+}
+
+/*
+ * The following functions must be a #define	and not static inline.
+ * This ensures that the native linux semaphore functions (down/up)
+ * will be correctly located in the users code which is important
+ * for the built in kernel lock analysis tools
+ */
+/* BEGIN CSTYLED */
+#define	rw_init(rwp, name, type, arg)					\
+({									\
+	static struct lock_class_key __key;				\
+	ASSERT(type == RW_DEFAULT || type == RW_NOLOCKDEP);		\
+									\
+	__init_rwsem(SEM(rwp), #rwp, &__key);				\
+	spl_rw_clear_owner(rwp);					\
+	spl_rw_set_type(rwp, type);					\
+})
+
+#define	rw_destroy(rwp)							\
+({									\
+	VERIFY(!RW_LOCK_HELD(rwp));					\
+})
+
+#define	rw_tryenter(rwp, rw)						\
+({									\
+	int _rc_ = 0;							\
+									\
+	spl_rw_lockdep_off_maybe(rwp);					\
+	switch (rw) {							\
+	case RW_READER:							\
+		_rc_ = down_read_trylock(SEM(rwp));			\
+		break;							\
+	case RW_WRITER:							\
+		if ((_rc_ = down_write_trylock(SEM(rwp))))		\
+			spl_rw_set_owner(rwp);				\
+		break;							\
+	default:							\
+		VERIFY(0);						\
+	}								\
+	spl_rw_lockdep_on_maybe(rwp);					\
+	_rc_;								\
+})
+
+#define	rw_enter(rwp, rw)						\
+({									\
+	spl_rw_lockdep_off_maybe(rwp);					\
+	switch (rw) {							\
+	case RW_READER:							\
+		down_read(SEM(rwp));					\
+		break;							\
+	case RW_WRITER:							\
+		down_write(SEM(rwp));					\
+		spl_rw_set_owner(rwp);					\
+		break;							\
+	default:							\
+		VERIFY(0);						\
+	}								\
+	spl_rw_lockdep_on_maybe(rwp);					\
+})
+
+#define	rw_exit(rwp)							\
+({									\
+	spl_rw_lockdep_off_maybe(rwp);					\
+	if (RW_WRITE_HELD(rwp)) {					\
+		spl_rw_clear_owner(rwp);				\
+		up_write(SEM(rwp));					\
+	} else {							\
+		ASSERT(RW_READ_HELD(rwp));				\
+		up_read(SEM(rwp));					\
+	}								\
+	spl_rw_lockdep_on_maybe(rwp);					\
+})
+
+#define	rw_downgrade(rwp)						\
+({									\
+	spl_rw_lockdep_off_maybe(rwp);					\
+	spl_rw_clear_owner(rwp);					\
+	downgrade_write(SEM(rwp));					\
+	spl_rw_lockdep_on_maybe(rwp);					\
+})
+
+#define	rw_tryupgrade(rwp)						\
+({									\
+	int _rc_ = 0;							\
+									\
+	if (RW_WRITE_HELD(rwp)) {					\
+		_rc_ = 1;						\
+	} else {							\
+		spl_rw_lockdep_off_maybe(rwp);				\
+		if ((_rc_ = rwsem_tryupgrade(SEM(rwp))))		\
+			spl_rw_set_owner(rwp);				\
+		spl_rw_lockdep_on_maybe(rwp);				\
+	}								\
+	_rc_;								\
+})
+/* END CSTYLED */
+
+int spl_rw_init(void);
+void spl_rw_fini(void);
+int rwsem_tryupgrade(struct rw_semaphore *rwsem);
+
+#endif /* _SPL_RWLOCK_H */
diff --git a/include/spl/sys/shrinker.h b/include/spl/sys/shrinker.h
new file mode 100644
index 000000000..28c1fa78c
--- /dev/null
+++ b/include/spl/sys/shrinker.h
@@ -0,0 +1,209 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_SHRINKER_H
+#define	_SPL_SHRINKER_H
+
+#include <linux/mm.h>
+#include <linux/fs.h>
+
+#if !defined(HAVE_SHRINK_CONTROL_STRUCT)
+struct shrink_control {
+	gfp_t gfp_mask;
+	unsigned long nr_to_scan;
+};
+#endif /* HAVE_SHRINK_CONTROL_STRUCT */
+
+/*
+ * Due to frequent changes in the shrinker API the following
+ * compatibility wrappers should be used.  They are as follows:
+ *
+ * SPL_SHRINKER_DECLARE is used to declare the shrinker which is
+ * passed to spl_register_shrinker()/spl_unregister_shrinker().  Use
+ * shrinker_name to set the shrinker variable name, shrinker_callback
+ * to set the callback function, and seek_cost to define the cost of
+ * reclaiming an object.
+ *
+ *   SPL_SHRINKER_DECLARE(shrinker_name, shrinker_callback, seek_cost);
+ *
+ * SPL_SHRINKER_CALLBACK_FWD_DECLARE is used when a forward declaration
+ * of the shrinker callback function is required.  Only the callback
+ * function needs to be passed.
+ *
+ *   SPL_SHRINKER_CALLBACK_FWD_DECLARE(shrinker_callback);
+ *
+ * SPL_SHRINKER_CALLBACK_WRAPPER is used to declare the callback function
+ * which is registered with the shrinker.  This function will call your
+ * custom shrinker which must use the following prototype.  Notice the
+ * leading __'s, these must be appended to the callback_function name.
+ *
+ *   int  __shrinker_callback(struct shrinker *, struct shrink_control *)
+ *   SPL_SHRINKER_CALLBACK_WRAPPER(shrinker_callback);a
+ *
+ *
+ * Example:
+ *
+ * SPL_SHRINKER_CALLBACK_FWD_DECLARE(my_shrinker_fn);
+ * SPL_SHRINKER_DECLARE(my_shrinker, my_shrinker_fn, 1);
+ *
+ * static int
+ * __my_shrinker_fn(struct shrinker *shrink, struct shrink_control *sc)
+ * {
+ *	if (sc->nr_to_scan) {
+ *		...scan objects in the cache and reclaim them...
+ *	}
+ *
+ *	...calculate number of objects in the cache...
+ *
+ *	return (number of objects in the cache);
+ * }
+ * SPL_SHRINKER_CALLBACK_WRAPPER(my_shrinker_fn);
+ */
+
+#define	spl_register_shrinker(x)	register_shrinker(x)
+#define	spl_unregister_shrinker(x)	unregister_shrinker(x)
+
+/*
+ * Linux 2.6.23 - 2.6.34 Shrinker API Compatibility.
+ */
+#if defined(HAVE_2ARGS_OLD_SHRINKER_CALLBACK)
+#define	SPL_SHRINKER_DECLARE(s, x, y)					\
+static struct shrinker s = {						\
+	.shrink = x,							\
+	.seeks = y							\
+}
+
+#define	SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn)				\
+static int fn(int nr_to_scan, unsigned int gfp_mask)
+
+#define	SPL_SHRINKER_CALLBACK_WRAPPER(fn)				\
+static int								\
+fn(int nr_to_scan, unsigned int gfp_mask)				\
+{									\
+	struct shrink_control sc;					\
+									\
+	sc.nr_to_scan = nr_to_scan;					\
+	sc.gfp_mask = gfp_mask;						\
+									\
+	return (__ ## fn(NULL, &sc));					\
+}
+
+/*
+ * Linux 2.6.35 to 2.6.39 Shrinker API Compatibility.
+ */
+#elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
+#define	SPL_SHRINKER_DECLARE(s, x, y)					\
+static struct shrinker s = {						\
+	.shrink = x,							\
+	.seeks = y							\
+}
+
+#define	SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn)				\
+static int fn(struct shrinker *, int, unsigned int)
+
+#define	SPL_SHRINKER_CALLBACK_WRAPPER(fn)				\
+static int								\
+fn(struct shrinker *shrink, int nr_to_scan, unsigned int gfp_mask)	\
+{									\
+	struct shrink_control sc;					\
+									\
+	sc.nr_to_scan = nr_to_scan;					\
+	sc.gfp_mask = gfp_mask;						\
+									\
+	return (__ ## fn(shrink, &sc));					\
+}
+
+/*
+ * Linux 3.0 to 3.11 Shrinker API Compatibility.
+ */
+#elif defined(HAVE_2ARGS_NEW_SHRINKER_CALLBACK)
+#define	SPL_SHRINKER_DECLARE(s, x, y)					\
+static struct shrinker s = {						\
+	.shrink = x,							\
+	.seeks = y							\
+}
+
+#define	SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn)				\
+static int fn(struct shrinker *, struct shrink_control *)
+
+#define	SPL_SHRINKER_CALLBACK_WRAPPER(fn)				\
+static int								\
+fn(struct shrinker *shrink, struct shrink_control *sc)			\
+{									\
+	return (__ ## fn(shrink, sc));					\
+}
+
+/*
+ * Linux 3.12 and later Shrinker API Compatibility.
+ */
+#elif defined(HAVE_SPLIT_SHRINKER_CALLBACK)
+#define	SPL_SHRINKER_DECLARE(s, x, y)					\
+static struct shrinker s = {						\
+	.count_objects = x ## _count_objects,				\
+	.scan_objects = x ## _scan_objects,				\
+	.seeks = y							\
+}
+
+#define	SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn)				\
+static unsigned long fn ## _count_objects(struct shrinker *,		\
+    struct shrink_control *);						\
+static unsigned long fn ## _scan_objects(struct shrinker *,		\
+    struct shrink_control *)
+
+#define	SPL_SHRINKER_CALLBACK_WRAPPER(fn)				\
+static unsigned long							\
+fn ## _count_objects(struct shrinker *shrink, struct shrink_control *sc)\
+{									\
+	int __ret__;							\
+									\
+	sc->nr_to_scan = 0;						\
+	__ret__ = __ ## fn(NULL, sc);					\
+									\
+	/* Errors may not be returned and must be converted to zeros */	\
+	return ((__ret__ < 0) ? 0 : __ret__);				\
+}									\
+									\
+static unsigned long							\
+fn ## _scan_objects(struct shrinker *shrink, struct shrink_control *sc)	\
+{									\
+	int __ret__;							\
+									\
+	__ret__ = __ ## fn(NULL, sc);					\
+	return ((__ret__ < 0) ? SHRINK_STOP : __ret__);			\
+}
+#else
+/*
+ * Linux 2.x to 2.6.22, or a newer shrinker API has been introduced.
+ */
+#error "Unknown shrinker callback"
+#endif
+
+#if defined(HAVE_SPLIT_SHRINKER_CALLBACK)
+typedef unsigned long	spl_shrinker_t;
+#else
+typedef int		spl_shrinker_t;
+#define	SHRINK_STOP	(-1)
+#endif
+
+#endif /* SPL_SHRINKER_H */
diff --git a/include/spl/sys/sid.h b/include/spl/sys/sid.h
new file mode 100644
index 000000000..731b62c47
--- /dev/null
+++ b/include/spl/sys/sid.h
@@ -0,0 +1,61 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_SID_H
+#define	_SPL_SID_H
+
+typedef struct ksiddomain {
+	char		*kd_name;
+} ksiddomain_t;
+
+typedef enum ksid_index {
+	KSID_USER,
+	KSID_GROUP,
+	KSID_OWNER,
+	KSID_COUNT
+} ksid_index_t;
+
+typedef int ksid_t;
+
+static inline ksiddomain_t *
+ksid_lookupdomain(const char *dom)
+{
+	ksiddomain_t *kd;
+	int len = strlen(dom);
+
+	kd = kmem_zalloc(sizeof (ksiddomain_t), KM_SLEEP);
+	kd->kd_name = kmem_zalloc(len + 1, KM_SLEEP);
+	memcpy(kd->kd_name, dom, len);
+
+	return (kd);
+}
+
+static inline void
+ksiddomain_rele(ksiddomain_t *ksid)
+{
+	kmem_free(ksid->kd_name, strlen(ksid->kd_name) + 1);
+	kmem_free(ksid, sizeof (ksiddomain_t));
+}
+
+#endif /* _SPL_SID_H */
diff --git a/include/spl/sys/signal.h b/include/spl/sys/signal.h
new file mode 100644
index 000000000..36b8b5d98
--- /dev/null
+++ b/include/spl/sys/signal.h
@@ -0,0 +1,55 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_SIGNAL_H
+#define	_SPL_SIGNAL_H
+
+#include <linux/sched.h>
+
+#ifdef HAVE_SCHED_SIGNAL_HEADER
+#include <linux/sched/signal.h>
+#endif
+
+#define	FORREAL		0	/* Usual side-effects */
+#define	JUSTLOOKING	1	/* Don't stop the process */
+
+/*
+ * The "why" argument indicates the allowable side-effects of the call:
+ *
+ * FORREAL:  Extract the next pending signal from p_sig into p_cursig;
+ * stop the process if a stop has been requested or if a traced signal
+ * is pending.
+ *
+ * JUSTLOOKING:  Don't stop the process, just indicate whether or not
+ * a signal might be pending (FORREAL is needed to tell for sure).
+ */
+static __inline__ int
+issig(int why)
+{
+	ASSERT(why == FORREAL || why == JUSTLOOKING);
+
+	return (signal_pending(current));
+}
+
+#endif /* SPL_SIGNAL_H */
diff --git a/include/spl/sys/stat.h b/include/spl/sys/stat.h
new file mode 100644
index 000000000..83018e894
--- /dev/null
+++ b/include/spl/sys/stat.h
@@ -0,0 +1,30 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_STAT_H
+#define	_SPL_STAT_H
+
+#include <linux/stat.h>
+
+#endif /* SPL_STAT_H */
diff --git a/include/spl/sys/strings.h b/include/spl/sys/strings.h
new file mode 100644
index 000000000..4fb803206
--- /dev/null
+++ b/include/spl/sys/strings.h
@@ -0,0 +1,31 @@
+/*
+ *  Copyright (C) 2018 Lawrence Livermore National Security, LLC.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _SPL_SYS_STRINGS_H
+#define	_SPL_SYS_STRINGS_H
+
+#include <linux/string.h>
+
+#define	bzero(ptr, size)		memset(ptr, 0, size)
+#define	bcopy(src, dest, size)		memmove(dest, src, size)
+#define	bcmp(src, dest, size)		memcmp((src), (dest), (size_t)(size))
+
+#endif	/* _SPL_SYS_STRINGS_H */
diff --git a/include/spl/sys/sunddi.h b/include/spl/sys/sunddi.h
new file mode 100644
index 000000000..29a6fe00d
--- /dev/null
+++ b/include/spl/sys/sunddi.h
@@ -0,0 +1,58 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_SUNDDI_H
+#define	_SPL_SUNDDI_H
+
+#include <sys/cred.h>
+#include <sys/uio.h>
+#include <sys/mutex.h>
+#include <sys/u8_textprep.h>
+#include <sys/vnode.h>
+
+typedef int ddi_devid_t;
+
+#define	DDI_DEV_T_NONE				((dev_t)-1)
+#define	DDI_DEV_T_ANY				((dev_t)-2)
+#define	DI_MAJOR_T_UNKNOWN			((major_t)0)
+
+#define	DDI_PROP_DONTPASS			0x0001
+#define	DDI_PROP_CANSLEEP			0x0002
+
+#define	DDI_SUCCESS				0
+#define	DDI_FAILURE				-1
+
+#define	ddi_prop_lookup_string(x1, x2, x3, x4, x5)	(*x5 = NULL)
+#define	ddi_prop_free(x)				(void)0
+#define	ddi_root_node()					(void)0
+
+extern int ddi_strtoul(const char *, char **, int, unsigned long *);
+extern int ddi_strtol(const char *, char **, int, long *);
+extern int ddi_strtoull(const char *, char **, int, unsigned long long *);
+extern int ddi_strtoll(const char *, char **, int, long long *);
+
+extern int ddi_copyin(const void *from, void *to, size_t len, int flags);
+extern int ddi_copyout(const void *from, void *to, size_t len, int flags);
+
+#endif /* SPL_SUNDDI_H */
diff --git a/include/spl/sys/sysmacros.h b/include/spl/sys/sysmacros.h
new file mode 100644
index 000000000..839e7fd8c
--- /dev/null
+++ b/include/spl/sys/sysmacros.h
@@ -0,0 +1,228 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_SYSMACROS_H
+#define	_SPL_SYSMACROS_H
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/cpumask.h>
+#include <sys/debug.h>
+#include <sys/zone.h>
+#include <sys/signal.h>
+#include <asm/page.h>
+
+#ifdef HAVE_SCHED_RT_HEADER
+#include <linux/sched/rt.h>
+#endif
+
+#ifndef _KERNEL
+#define	_KERNEL				__KERNEL__
+#endif
+
+#define	FALSE				0
+#define	TRUE				1
+
+#define	INT8_MAX			(127)
+#define	INT8_MIN			(-128)
+#define	UINT8_MAX			(255)
+#define	UINT8_MIN			(0)
+
+#define	INT16_MAX			(32767)
+#define	INT16_MIN			(-32768)
+#define	UINT16_MAX			(65535)
+#define	UINT16_MIN			(0)
+
+#define	INT32_MAX			INT_MAX
+#define	INT32_MIN			INT_MIN
+#define	UINT32_MAX			UINT_MAX
+#define	UINT32_MIN			UINT_MIN
+
+#define	INT64_MAX			LLONG_MAX
+#define	INT64_MIN			LLONG_MIN
+#define	UINT64_MAX			ULLONG_MAX
+#define	UINT64_MIN			ULLONG_MIN
+
+#define	NBBY				8
+
+#define	MAXMSGLEN			256
+#define	MAXNAMELEN			256
+#define	MAXPATHLEN			4096
+#define	MAXOFFSET_T			LLONG_MAX
+#define	MAXBSIZE			8192
+#define	DEV_BSIZE			512
+#define	DEV_BSHIFT			9 /* log2(DEV_BSIZE) */
+
+#define	proc_pageout			NULL
+#define	curproc				current
+#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
+#define	RLIM64_INFINITY			(~0ULL)
+#endif
+
+/*
+ * 0..MAX_PRIO-1:		Process priority
+ * 0..MAX_RT_PRIO-1:		RT priority tasks
+ * MAX_RT_PRIO..MAX_PRIO-1:	SCHED_NORMAL tasks
+ *
+ * Treat shim tasks as SCHED_NORMAL tasks
+ */
+#define	minclsyspri			(MAX_PRIO-1)
+#define	maxclsyspri			(MAX_RT_PRIO)
+#define	defclsyspri			(DEFAULT_PRIO)
+
+#ifndef NICE_TO_PRIO
+#define	NICE_TO_PRIO(nice)		(MAX_RT_PRIO + (nice) + 20)
+#endif
+#ifndef PRIO_TO_NICE
+#define	PRIO_TO_NICE(prio)		((prio) - MAX_RT_PRIO - 20)
+#endif
+
+/*
+ * Missing macros
+ */
+#ifndef PAGESIZE
+#define	PAGESIZE			PAGE_SIZE
+#endif
+
+#ifndef PAGESHIFT
+#define	PAGESHIFT			PAGE_SHIFT
+#endif
+
+/* Dtrace probes do not exist in the linux kernel */
+#ifdef DTRACE_PROBE
+#undef  DTRACE_PROBE
+#endif  /* DTRACE_PROBE */
+#define	DTRACE_PROBE(a)					((void)0)
+
+#ifdef DTRACE_PROBE1
+#undef  DTRACE_PROBE1
+#endif  /* DTRACE_PROBE1 */
+#define	DTRACE_PROBE1(a, b, c)				((void)0)
+
+#ifdef DTRACE_PROBE2
+#undef  DTRACE_PROBE2
+#endif  /* DTRACE_PROBE2 */
+#define	DTRACE_PROBE2(a, b, c, d, e)			((void)0)
+
+#ifdef DTRACE_PROBE3
+#undef  DTRACE_PROBE3
+#endif  /* DTRACE_PROBE3 */
+#define	DTRACE_PROBE3(a, b, c, d, e, f, g)		((void)0)
+
+#ifdef DTRACE_PROBE4
+#undef  DTRACE_PROBE4
+#endif  /* DTRACE_PROBE4 */
+#define	DTRACE_PROBE4(a, b, c, d, e, f, g, h, i)	((void)0)
+
+/* Missing globals */
+extern char spl_version[32];
+extern unsigned long spl_hostid;
+
+/* Missing misc functions */
+extern uint32_t zone_get_hostid(void *zone);
+extern void spl_setup(void);
+extern void spl_cleanup(void);
+
+#define	highbit(x)		__fls(x)
+#define	lowbit(x)		__ffs(x)
+
+#define	highbit64(x)		fls64(x)
+#define	makedevice(maj, min)	makedev(maj, min)
+
+/* common macros */
+#ifndef MIN
+#define	MIN(a, b)		((a) < (b) ? (a) : (b))
+#endif
+#ifndef MAX
+#define	MAX(a, b)		((a) < (b) ? (b) : (a))
+#endif
+#ifndef ABS
+#define	ABS(a)			((a) < 0 ? -(a) : (a))
+#endif
+#ifndef DIV_ROUND_UP
+#define	DIV_ROUND_UP(n, d)	(((n) + (d) - 1) / (d))
+#endif
+#ifndef roundup
+#define	roundup(x, y)		((((x) + ((y) - 1)) / (y)) * (y))
+#endif
+#ifndef howmany
+#define	howmany(x, y)		(((x) + ((y) - 1)) / (y))
+#endif
+
+/*
+ * Compatibility macros/typedefs needed for Solaris -> Linux port
+ */
+#define	P2ALIGN(x, align)	((x) & -(align))
+#define	P2CROSS(x, y, align)	(((x) ^ (y)) > (align) - 1)
+#define	P2ROUNDUP(x, align)	((((x) - 1) | ((align) - 1)) + 1)
+#define	P2PHASE(x, align)	((x) & ((align) - 1))
+#define	P2NPHASE(x, align)	(-(x) & ((align) - 1))
+#define	ISP2(x)			(((x) & ((x) - 1)) == 0)
+#define	IS_P2ALIGNED(v, a)	((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
+#define	P2BOUNDARY(off, len, align) \
+				(((off) ^ ((off) + (len) - 1)) > (align) - 1)
+
+/*
+ * Typed version of the P2* macros.  These macros should be used to ensure
+ * that the result is correctly calculated based on the data type of (x),
+ * which is passed in as the last argument, regardless of the data
+ * type of the alignment.  For example, if (x) is of type uint64_t,
+ * and we want to round it up to a page boundary using "PAGESIZE" as
+ * the alignment, we can do either
+ *
+ * P2ROUNDUP(x, (uint64_t)PAGESIZE)
+ * or
+ * P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
+ */
+#define	P2ALIGN_TYPED(x, align, type)   \
+	((type)(x) & -(type)(align))
+#define	P2PHASE_TYPED(x, align, type)   \
+	((type)(x) & ((type)(align) - 1))
+#define	P2NPHASE_TYPED(x, align, type)  \
+	(-(type)(x) & ((type)(align) - 1))
+#define	P2ROUNDUP_TYPED(x, align, type) \
+	((((type)(x) - 1) | ((type)(align) - 1)) + 1)
+#define	P2END_TYPED(x, align, type)     \
+	(-(~(type)(x) & -(type)(align)))
+#define	P2PHASEUP_TYPED(x, align, phase, type)  \
+	((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
+#define	P2CROSS_TYPED(x, y, align, type)	\
+	(((type)(x) ^ (type)(y)) > (type)(align) - 1)
+#define	P2SAMEHIGHBIT_TYPED(x, y, type) \
+	(((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))
+
+#if defined(_KERNEL) && !defined(_KMEMUSER) && !defined(offsetof)
+
+/* avoid any possibility of clashing with <stddef.h> version */
+
+#define	offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
+#endif
+
+#endif  /* _SPL_SYSMACROS_H */
diff --git a/include/spl/sys/systeminfo.h b/include/spl/sys/systeminfo.h
new file mode 100644
index 000000000..225569158
--- /dev/null
+++ b/include/spl/sys/systeminfo.h
@@ -0,0 +1,36 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_SYSTEMINFO_H
+#define	_SPL_SYSTEMINFO_H
+
+#define	HW_HOSTID_LEN		11		/* minimum buffer size needed */
+						/* to hold a decimal or hex */
+						/* hostid string */
+
+/* Supplemental definitions for Linux. */
+#define	HW_HOSTID_PATH		"/etc/hostid"   /* binary configuration file */
+#define	HW_HOSTID_MASK		0xFFFFFFFF 	/* significant hostid bits */
+
+#endif /* SPL_SYSTEMINFO_H */
diff --git a/include/spl/sys/taskq.h b/include/spl/sys/taskq.h
new file mode 100644
index 000000000..7353367a2
--- /dev/null
+++ b/include/spl/sys/taskq.h
@@ -0,0 +1,163 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_TASKQ_H
+#define	_SPL_TASKQ_H
+
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/kthread.h>
+#include <sys/types.h>
+#include <sys/thread.h>
+#include <sys/rwlock.h>
+#include <sys/wait.h>
+
+#define	TASKQ_NAMELEN		31
+
+#define	TASKQ_PREPOPULATE	0x00000001
+#define	TASKQ_CPR_SAFE		0x00000002
+#define	TASKQ_DYNAMIC		0x00000004
+#define	TASKQ_THREADS_CPU_PCT	0x00000008
+#define	TASKQ_DC_BATCH		0x00000010
+#define	TASKQ_ACTIVE		0x80000000
+
+/*
+ * Flags for taskq_dispatch. TQ_SLEEP/TQ_NOSLEEP should be same as
+ * KM_SLEEP/KM_NOSLEEP.  TQ_NOQUEUE/TQ_NOALLOC are set particularly
+ * large so as not to conflict with already used GFP_* defines.
+ */
+#define	TQ_SLEEP		0x00000000
+#define	TQ_NOSLEEP		0x00000001
+#define	TQ_PUSHPAGE		0x00000002
+#define	TQ_NOQUEUE		0x01000000
+#define	TQ_NOALLOC		0x02000000
+#define	TQ_NEW			0x04000000
+#define	TQ_FRONT		0x08000000
+
+/*
+ * Reserved taskqid values.
+ */
+#define	TASKQID_INVALID		((taskqid_t)0)
+#define	TASKQID_INITIAL		((taskqid_t)1)
+
+/*
+ * spin_lock(lock) and spin_lock_nested(lock,0) are equivalent,
+ * so TQ_LOCK_DYNAMIC must not evaluate to 0
+ */
+typedef enum tq_lock_role {
+	TQ_LOCK_GENERAL =	0,
+	TQ_LOCK_DYNAMIC =	1,
+} tq_lock_role_t;
+
+typedef unsigned long taskqid_t;
+typedef void (task_func_t)(void *);
+
+typedef struct taskq {
+	spinlock_t		tq_lock;	/* protects taskq_t */
+	char			*tq_name;	/* taskq name */
+	int			tq_instance;	/* instance of tq_name */
+	struct list_head	tq_thread_list;	/* list of all threads */
+	struct list_head	tq_active_list;	/* list of active threads */
+	int			tq_nactive;	/* # of active threads */
+	int			tq_nthreads;	/* # of existing threads */
+	int			tq_nspawn;	/* # of threads being spawned */
+	int			tq_maxthreads;	/* # of threads maximum */
+	int			tq_pri;		/* priority */
+	int			tq_minalloc;	/* min taskq_ent_t pool size */
+	int			tq_maxalloc;	/* max taskq_ent_t pool size */
+	int			tq_nalloc;	/* cur taskq_ent_t pool size */
+	uint_t			tq_flags;	/* flags */
+	taskqid_t		tq_next_id;	/* next pend/work id */
+	taskqid_t		tq_lowest_id;	/* lowest pend/work id */
+	struct list_head	tq_free_list;	/* free taskq_ent_t's */
+	struct list_head	tq_pend_list;	/* pending taskq_ent_t's */
+	struct list_head	tq_prio_list;	/* priority taskq_ent_t's */
+	struct list_head	tq_delay_list;	/* delayed taskq_ent_t's */
+	struct list_head	tq_taskqs;	/* all taskq_t's */
+	spl_wait_queue_head_t	tq_work_waitq;	/* new work waitq */
+	spl_wait_queue_head_t	tq_wait_waitq;	/* wait waitq */
+	tq_lock_role_t		tq_lock_class;	/* class when taking tq_lock */
+} taskq_t;
+
+typedef struct taskq_ent {
+	spinlock_t		tqent_lock;
+	spl_wait_queue_head_t	tqent_waitq;
+	struct timer_list	tqent_timer;
+	struct list_head	tqent_list;
+	taskqid_t		tqent_id;
+	task_func_t		*tqent_func;
+	void			*tqent_arg;
+	taskq_t			*tqent_taskq;
+	uintptr_t		tqent_flags;
+	unsigned long		tqent_birth;
+} taskq_ent_t;
+
+#define	TQENT_FLAG_PREALLOC	0x1
+#define	TQENT_FLAG_CANCEL	0x2
+
+typedef struct taskq_thread {
+	struct list_head	tqt_thread_list;
+	struct list_head	tqt_active_list;
+	struct task_struct	*tqt_thread;
+	taskq_t			*tqt_tq;
+	taskqid_t		tqt_id;
+	taskq_ent_t		*tqt_task;
+	uintptr_t		tqt_flags;
+} taskq_thread_t;
+
+/* Global system-wide dynamic task queue available for all consumers */
+extern taskq_t *system_taskq;
+/* Global dynamic task queue for long delay */
+extern taskq_t *system_delay_taskq;
+
+/* List of all taskqs */
+extern struct list_head tq_list;
+extern struct rw_semaphore tq_list_sem;
+
+extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t);
+extern taskqid_t taskq_dispatch_delay(taskq_t *, task_func_t, void *,
+    uint_t, clock_t);
+extern void taskq_dispatch_ent(taskq_t *, task_func_t, void *, uint_t,
+    taskq_ent_t *);
+extern int taskq_empty_ent(taskq_ent_t *);
+extern void taskq_init_ent(taskq_ent_t *);
+extern taskq_t *taskq_create(const char *, int, pri_t, int, int, uint_t);
+extern void taskq_destroy(taskq_t *);
+extern void taskq_wait_id(taskq_t *, taskqid_t);
+extern void taskq_wait_outstanding(taskq_t *, taskqid_t);
+extern void taskq_wait(taskq_t *);
+extern int taskq_cancel_id(taskq_t *, taskqid_t);
+extern int taskq_member(taskq_t *, kthread_t *);
+
+#define	taskq_create_proc(name, nthreads, pri, min, max, proc, flags) \
+    taskq_create(name, nthreads, pri, min, max, flags)
+#define	taskq_create_sysdc(name, nthreads, min, max, proc, dc, flags) \
+    taskq_create(name, nthreads, maxclsyspri, min, max, flags)
+
+int spl_taskq_init(void);
+void spl_taskq_fini(void);
+
+#endif  /* _SPL_TASKQ_H */
diff --git a/include/spl/sys/thread.h b/include/spl/sys/thread.h
new file mode 100644
index 000000000..3762717da
--- /dev/null
+++ b/include/spl/sys/thread.h
@@ -0,0 +1,69 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_THREAD_H
+#define	_SPL_THREAD_H
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/kthread.h>
+#include <sys/types.h>
+#include <sys/sysmacros.h>
+#include <sys/tsd.h>
+
+/*
+ * Thread interfaces
+ */
+#define	TP_MAGIC			0x53535353
+
+#define	TS_SLEEP			TASK_INTERRUPTIBLE
+#define	TS_RUN				TASK_RUNNING
+#define	TS_ZOMB				EXIT_ZOMBIE
+#define	TS_STOPPED			TASK_STOPPED
+
+typedef void (*thread_func_t)(void *);
+
+/* BEGIN CSTYLED */
+#define	thread_create(stk, stksize, func, arg, len, pp, state, pri)	\
+	__thread_create(stk, stksize, (thread_func_t)func,		\
+	#func, arg, len, pp, state, pri)
+/* END CSTYLED */
+
+#define	thread_exit()			__thread_exit()
+#define	thread_join(t)			VERIFY(0)
+#define	curthread			current
+#define	getcomm()			current->comm
+#define	getpid()			current->pid
+
+extern kthread_t *__thread_create(caddr_t stk, size_t  stksize,
+    thread_func_t func, const char *name, void *args, size_t len, proc_t *pp,
+    int state, pri_t pri);
+extern void __thread_exit(void);
+extern struct task_struct *spl_kthread_create(int (*func)(void *),
+    void *data, const char namefmt[], ...);
+
+extern proc_t p0;
+
+#endif  /* _SPL_THREAD_H */
diff --git a/include/spl/sys/time.h b/include/spl/sys/time.h
new file mode 100644
index 000000000..d6aaca913
--- /dev/null
+++ b/include/spl/sys/time.h
@@ -0,0 +1,82 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_TIME_H
+#define	_SPL_TIME_H
+
+#include <linux/module.h>
+#include <linux/time.h>
+#include <sys/types.h>
+#include <sys/timer.h>
+
+#if defined(CONFIG_64BIT)
+#define	TIME_MAX			INT64_MAX
+#define	TIME_MIN			INT64_MIN
+#else
+#define	TIME_MAX			INT32_MAX
+#define	TIME_MIN			INT32_MIN
+#endif
+
+#define	SEC				1
+#define	MILLISEC			1000
+#define	MICROSEC			1000000
+#define	NANOSEC				1000000000
+
+#define	MSEC2NSEC(m)	((hrtime_t)(m) * (NANOSEC / MILLISEC))
+#define	NSEC2MSEC(n)	((n) / (NANOSEC / MILLISEC))
+
+#define	USEC2NSEC(m)	((hrtime_t)(m) * (NANOSEC / MICROSEC))
+#define	NSEC2USEC(n)	((n) / (NANOSEC / MICROSEC))
+
+#define	NSEC2SEC(n)	((n) / (NANOSEC / SEC))
+#define	SEC2NSEC(m)	((hrtime_t)(m) * (NANOSEC / SEC))
+
+static const int hz = HZ;
+
+#define	TIMESPEC_OVERFLOW(ts)		\
+	((ts)->tv_sec < TIME_MIN || (ts)->tv_sec > TIME_MAX)
+
+static inline void
+gethrestime(timestruc_t *now)
+{
+	*now = current_kernel_time();
+}
+
+static inline time_t
+gethrestime_sec(void)
+{
+	struct timespec ts;
+	ts = current_kernel_time();
+	return (ts.tv_sec);
+}
+
+static inline hrtime_t
+gethrtime(void)
+{
+	struct timespec now;
+	getrawmonotonic(&now);
+	return (((hrtime_t)now.tv_sec * NSEC_PER_SEC) + now.tv_nsec);
+}
+
+#endif  /* _SPL_TIME_H */
diff --git a/include/spl/sys/timer.h b/include/spl/sys/timer.h
new file mode 100644
index 000000000..a6b134570
--- /dev/null
+++ b/include/spl/sys/timer.h
@@ -0,0 +1,75 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_TIMER_H
+#define	_SPL_TIMER_H
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/timer.h>
+
+#define	lbolt				((clock_t)jiffies)
+#define	lbolt64				((int64_t)get_jiffies_64())
+
+#define	ddi_get_lbolt()			((clock_t)jiffies)
+#define	ddi_get_lbolt64()		((int64_t)get_jiffies_64())
+
+#define	ddi_time_before(a, b)		(typecheck(clock_t, a) && \
+					typecheck(clock_t, b) && \
+					((a) - (b) < 0))
+#define	ddi_time_after(a, b)		ddi_time_before(b, a)
+#define	ddi_time_before_eq(a, b)	(!ddi_time_after(a, b))
+#define	ddi_time_after_eq(a, b)		ddi_time_before_eq(b, a)
+
+#define	ddi_time_before64(a, b)		(typecheck(int64_t, a) && \
+					typecheck(int64_t, b) && \
+					((a) - (b) < 0))
+#define	ddi_time_after64(a, b)		ddi_time_before64(b, a)
+#define	ddi_time_before_eq64(a, b)	(!ddi_time_after64(a, b))
+#define	ddi_time_after_eq64(a, b)	ddi_time_before_eq64(b, a)
+
+#define	delay(ticks)			schedule_timeout_uninterruptible(ticks)
+
+/* usleep_range() introduced in 2.6.36 */
+#ifndef HAVE_USLEEP_RANGE
+static inline void
+usleep_range(unsigned long min, unsigned long max)
+{
+	unsigned int min_ms = min / USEC_PER_MSEC;
+
+	if (min >= MAX_UDELAY_MS)
+		msleep(min_ms);
+	else
+		udelay(min);
+}
+#endif /* HAVE_USLEEP_RANGE */
+
+#define	SEC_TO_TICK(sec)		((sec) * HZ)
+#define	MSEC_TO_TICK(ms)		msecs_to_jiffies(ms)
+#define	USEC_TO_TICK(us)		usecs_to_jiffies(us)
+#define	NSEC_TO_TICK(ns)		usecs_to_jiffies(ns / NSEC_PER_USEC)
+
+#endif  /* _SPL_TIMER_H */
diff --git a/include/spl/sys/tsd.h b/include/spl/sys/tsd.h
new file mode 100644
index 000000000..39a291bf3
--- /dev/null
+++ b/include/spl/sys/tsd.h
@@ -0,0 +1,46 @@
+/*
+ *  Copyright (C) 2010 Lawrence Livermore National Security, LLC.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_TSD_H
+#define	_SPL_TSD_H
+
+#include <sys/types.h>
+
+#define	TSD_HASH_TABLE_BITS_DEFAULT	9
+#define	TSD_KEYS_MAX			32768
+#define	DTOR_PID			(PID_MAX_LIMIT+1)
+#define	PID_KEY				(TSD_KEYS_MAX+1)
+
+typedef void (*dtor_func_t)(void *);
+
+extern int tsd_set(uint_t, void *);
+extern void *tsd_get(uint_t);
+extern void *tsd_get_by_thread(uint_t, kthread_t *);
+extern void tsd_create(uint_t *, dtor_func_t);
+extern void tsd_destroy(uint_t *);
+extern void tsd_exit(void);
+
+int spl_tsd_init(void);
+void spl_tsd_fini(void);
+
+#endif /* _SPL_TSD_H */
diff --git a/include/spl/sys/types.h b/include/spl/sys/types.h
new file mode 100644
index 000000000..a5b478127
--- /dev/null
+++ b/include/spl/sys/types.h
@@ -0,0 +1,70 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_TYPES_H
+#define	_SPL_TYPES_H
+
+#include <linux/types.h>
+
+#ifndef ULLONG_MAX
+#define	ULLONG_MAX			(~0ULL)
+#endif
+
+#ifndef LLONG_MAX
+#define	LLONG_MAX			((long long)(~0ULL>>1))
+#endif
+
+typedef enum {
+	B_FALSE = 0,
+	B_TRUE = 1
+} boolean_t;
+
+typedef unsigned char		uchar_t;
+typedef unsigned short		ushort_t;
+typedef unsigned int		uint_t;
+typedef unsigned long		ulong_t;
+typedef unsigned long long	u_longlong_t;
+typedef long long		longlong_t;
+
+typedef unsigned long		intptr_t;
+typedef unsigned long long	rlim64_t;
+
+typedef struct task_struct	kthread_t;
+typedef struct task_struct	proc_t;
+
+typedef struct timespec		timestruc_t;
+typedef struct timespec		timespec_t;
+typedef longlong_t		hrtime_t;
+
+typedef int			id_t;
+typedef short			pri_t;
+typedef short			index_t;
+typedef longlong_t		offset_t;
+typedef u_longlong_t		u_offset_t;
+typedef ulong_t			pgcnt_t;
+
+typedef int			major_t;
+typedef int			minor_t;
+
+#endif	/* _SPL_TYPES_H */
diff --git a/include/spl/sys/types32.h b/include/spl/sys/types32.h
new file mode 100644
index 000000000..c60ba8c97
--- /dev/null
+++ b/include/spl/sys/types32.h
@@ -0,0 +1,35 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_TYPES32_H
+#define	_SPL_TYPES32_H
+
+#include <sys/types.h>
+
+typedef uint32_t	caddr32_t;
+typedef int32_t		daddr32_t;
+typedef int32_t		time32_t;
+typedef uint32_t	size32_t;
+
+#endif	/* _SPL_TYPES32_H */
diff --git a/include/spl/sys/uio.h b/include/spl/sys/uio.h
new file mode 100644
index 000000000..64c452b8d
--- /dev/null
+++ b/include/spl/sys/uio.h
@@ -0,0 +1,106 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Copyright (c) 2015 by Chunwei Chen. All rights reserved.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_UIO_H
+#define	_SPL_UIO_H
+
+#include <linux/uio.h>
+#include <linux/blkdev.h>
+#include <asm/uaccess.h>
+#include <sys/types.h>
+
+typedef struct iovec iovec_t;
+
+typedef enum uio_rw {
+	UIO_READ =		0,
+	UIO_WRITE =		1,
+} uio_rw_t;
+
+typedef enum uio_seg {
+	UIO_USERSPACE =		0,
+	UIO_SYSSPACE =		1,
+	UIO_USERISPACE =	2,
+	UIO_BVEC =		3,
+} uio_seg_t;
+
+typedef struct uio {
+	union {
+		const struct iovec	*uio_iov;
+		const struct bio_vec	*uio_bvec;
+	};
+	int		uio_iovcnt;
+	offset_t	uio_loffset;
+	uio_seg_t	uio_segflg;
+	uint16_t	uio_fmode;
+	uint16_t	uio_extflg;
+	offset_t	uio_limit;
+	ssize_t		uio_resid;
+	size_t		uio_skip;
+} uio_t;
+
+typedef struct aio_req {
+	uio_t		*aio_uio;
+	void		*aio_private;
+} aio_req_t;
+
+typedef enum xuio_type {
+	UIOTYPE_ASYNCIO,
+	UIOTYPE_ZEROCOPY,
+} xuio_type_t;
+
+
+#define	UIOA_IOV_MAX    16
+
+typedef struct uioa_page_s {
+	int	uioa_pfncnt;
+	void	**uioa_ppp;
+	caddr_t	uioa_base;
+	size_t	uioa_len;
+} uioa_page_t;
+
+typedef struct xuio {
+	uio_t xu_uio;
+	enum xuio_type xu_type;
+	union {
+		struct {
+			uint32_t xu_a_state;
+			ssize_t xu_a_mbytes;
+			uioa_page_t *xu_a_lcur;
+			void **xu_a_lppp;
+			void *xu_a_hwst[4];
+			uioa_page_t xu_a_locked[UIOA_IOV_MAX];
+		} xu_aio;
+
+		struct {
+			int xu_zc_rw;
+			void *xu_zc_priv;
+		} xu_zc;
+	} xu_ext;
+} xuio_t;
+
+#define	XUIO_XUZC_PRIV(xuio)	xuio->xu_ext.xu_zc.xu_zc_priv
+#define	XUIO_XUZC_RW(xuio)	xuio->xu_ext.xu_zc.xu_zc_rw
+
+#endif /* SPL_UIO_H */
diff --git a/include/spl/sys/user.h b/include/spl/sys/user.h
new file mode 100644
index 000000000..b12cb240e
--- /dev/null
+++ b/include/spl/sys/user.h
@@ -0,0 +1,42 @@
+/*
+ *  Copyright (C) 2015 Cluster Inc.
+ *  Produced at ClusterHQ Inc (cf, DISCLAIMER).
+ *  Written by Richard Yao <[email protected]>.
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_USER_H
+#define	_SPL_USER_H
+
+/*
+ * We have uf_info_t for areleasef(). We implement areleasef() using a global
+ * linked list of all open file descriptors with the task structs referenced,
+ * so accessing the correct descriptor from areleasef() only requires knowing
+ * about the Linux task_struct. Since this is internal to our compatibility
+ * layer, we make it an opaque type.
+ *
+ * XXX: If the descriptor changes under us and we do not do a getf() between
+ * the change and using it, we would get an incorrect reference.
+ */
+
+struct uf_info;
+typedef struct uf_info uf_info_t;
+
+#define	P_FINFO(x) ((uf_info_t *)x)
+
+#endif /* SPL_USER_H */
diff --git a/include/spl/sys/vfs.h b/include/spl/sys/vfs.h
new file mode 100644
index 000000000..0d5e1d51d
--- /dev/null
+++ b/include/spl/sys/vfs.h
@@ -0,0 +1,51 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_ZFS_H
+#define	_SPL_ZFS_H
+
+#include <linux/mount.h>
+#include <linux/fs.h>
+#include <linux/dcache.h>
+#include <linux/statfs.h>
+#include <linux/xattr.h>
+#include <linux/security.h>
+#include <linux/seq_file.h>
+
+#define	MAXFIDSZ	64
+
+typedef struct spl_fid {
+	union {
+		long fid_pad;
+		struct {
+			ushort_t len;		/* length of data in bytes */
+			char data[MAXFIDSZ];	/* data (variable len) */
+		} _fid;
+	} un;
+} fid_t;
+
+#define	fid_len		un._fid.len
+#define	fid_data	un._fid.data
+
+#endif /* SPL_ZFS_H */
diff --git a/include/spl/sys/vmem.h b/include/spl/sys/vmem.h
new file mode 100644
index 000000000..a9b12eeb9
--- /dev/null
+++ b/include/spl/sys/vmem.h
@@ -0,0 +1,109 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_VMEM_H
+#define	_SPL_VMEM_H
+
+#include <sys/kmem.h>
+#include <linux/sched.h>
+#include <linux/vmalloc.h>
+
+typedef struct vmem { } vmem_t;
+
+extern vmem_t *heap_arena;
+extern vmem_t *zio_alloc_arena;
+extern vmem_t *zio_arena;
+
+extern size_t vmem_size(vmem_t *vmp, int typemask);
+
+/*
+ * Memory allocation interfaces
+ */
+#define	VMEM_ALLOC	0x01
+#define	VMEM_FREE	0x02
+
+#ifndef VMALLOC_TOTAL
+#define	VMALLOC_TOTAL	(VMALLOC_END - VMALLOC_START)
+#endif
+
+/*
+ * vmem_* is an interface to a low level arena-based memory allocator on
+ * Illumos that is used to allocate virtual address space. The kmem SLAB
+ * allocator allocates slabs from it. Then the generic allocation functions
+ * kmem_{alloc,zalloc,free}() are layered on top of SLAB allocators.
+ *
+ * On Linux, the primary means of doing allocations is via kmalloc(), which
+ * is similarly layered on top of something called the buddy allocator. The
+ * buddy allocator is not available to kernel modules, it uses physical
+ * memory addresses rather than virtual memory addresses and is prone to
+ * fragmentation.
+ *
+ * Linux sets aside a relatively small address space for in-kernel virtual
+ * memory from which allocations can be done using vmalloc().  It might seem
+ * like a good idea to use vmalloc() to implement something similar to
+ * Illumos' allocator. However, this has the following problems:
+ *
+ * 1. Page directory table allocations are hard coded to use GFP_KERNEL.
+ *    Consequently, any KM_PUSHPAGE or KM_NOSLEEP allocations done using
+ *    vmalloc() will not have proper semantics.
+ *
+ * 2. Address space exhaustion is a real issue on 32-bit platforms where
+ *    only a few 100MB are available. The kernel will handle it by spinning
+ *    when it runs out of address space.
+ *
+ * 3. All vmalloc() allocations and frees are protected by a single global
+ *    lock which serializes all allocations.
+ *
+ * 4. Accessing /proc/meminfo and /proc/vmallocinfo will iterate the entire
+ *    list. The former will sum the allocations while the latter will print
+ *    them to user space in a way that user space can keep the lock held
+ *    indefinitely.  When the total number of mapped allocations is large
+ *    (several 100,000) a large amount of time will be spent waiting on locks.
+ *
+ * 5. Linux has a wait_on_bit() locking primitive that assumes physical
+ *    memory is used, it simply does not work on virtual memory.  Certain
+ *    Linux structures (e.g. the superblock) use them and might be embedded
+ *    into a structure from Illumos.  This makes using Linux virtual memory
+ *    unsafe in certain situations.
+ *
+ * It follows that we cannot obtain identical semantics to those on Illumos.
+ * Consequently, we implement the kmem_{alloc,zalloc,free}() functions in
+ * such a way that they can be used as drop-in replacements for small vmem_*
+ * allocations (8MB in size or smaller) and map vmem_{alloc,zalloc,free}()
+ * to them.
+ */
+
+#define	vmem_alloc(sz, fl)	spl_vmem_alloc((sz), (fl), __func__, __LINE__)
+#define	vmem_zalloc(sz, fl)	spl_vmem_zalloc((sz), (fl), __func__, __LINE__)
+#define	vmem_free(ptr, sz)	spl_vmem_free((ptr), (sz))
+#define	vmem_qcache_reap(ptr)	((void)0)
+
+extern void *spl_vmem_alloc(size_t sz, int fl, const char *func, int line);
+extern void *spl_vmem_zalloc(size_t sz, int fl, const char *func, int line);
+extern void spl_vmem_free(const void *ptr, size_t sz);
+
+int spl_vmem_init(void);
+void spl_vmem_fini(void);
+
+#endif	/* _SPL_VMEM_H */
diff --git a/include/spl/sys/vmsystm.h b/include/spl/sys/vmsystm.h
new file mode 100644
index 000000000..2b48fe0e3
--- /dev/null
+++ b/include/spl/sys/vmsystm.h
@@ -0,0 +1,84 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_VMSYSTM_H
+#define	_SPL_VMSYSTM_H
+
+#include <linux/mmzone.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/highmem.h>
+#include <linux/vmalloc.h>
+#include <sys/types.h>
+#include <asm/uaccess.h>
+
+#define	membar_producer()		smp_wmb()
+#define	physmem				totalram_pages
+#define	freemem			(nr_free_pages() + \
+				global_page_state(NR_INACTIVE_FILE) + \
+				global_page_state(NR_INACTIVE_ANON) + \
+				global_page_state(NR_SLAB_RECLAIMABLE))
+
+#define	xcopyin(from, to, size)		copy_from_user(to, from, size)
+#define	xcopyout(from, to, size)	copy_to_user(to, from, size)
+
+static __inline__ int
+copyin(const void *from, void *to, size_t len)
+{
+	/* On error copyin routine returns -1 */
+	if (xcopyin(from, to, len))
+		return (-1);
+
+	return (0);
+}
+
+static __inline__ int
+copyout(const void *from, void *to, size_t len)
+{
+	/* On error copyout routine returns -1 */
+	if (xcopyout(from, to, len))
+		return (-1);
+
+	return (0);
+}
+
+static __inline__ int
+copyinstr(const void *from, void *to, size_t len, size_t *done)
+{
+	size_t rc;
+
+	if (len == 0)
+		return (-ENAMETOOLONG);
+
+	/* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
+
+	memset(to, 0, len);
+	rc = copyin(from, to, len - 1);
+	if (done != NULL)
+		*done = rc;
+
+	return (0);
+}
+
+#endif /* SPL_VMSYSTM_H */
diff --git a/include/spl/sys/vnode.h b/include/spl/sys/vnode.h
new file mode 100644
index 000000000..a3f7828e7
--- /dev/null
+++ b/include/spl/sys/vnode.h
@@ -0,0 +1,204 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_VNODE_H
+#define	_SPL_VNODE_H
+
+#include <linux/module.h>
+#include <linux/syscalls.h>
+#include <linux/fcntl.h>
+#include <linux/buffer_head.h>
+#include <linux/dcache.h>
+#include <linux/namei.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/fs_struct.h>
+#include <linux/mount.h>
+#include <sys/kmem.h>
+#include <sys/mutex.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/uio.h>
+#include <sys/user.h>
+
+/*
+ * Prior to linux-2.6.33 only O_DSYNC semantics were implemented and
+ * they used the O_SYNC flag.  As of linux-2.6.33 the this behavior
+ * was properly split in to O_SYNC and O_DSYNC respectively.
+ */
+#ifndef O_DSYNC
+#define	O_DSYNC		O_SYNC
+#endif
+
+#define	FREAD		1
+#define	FWRITE		2
+#define	FCREAT		O_CREAT
+#define	FTRUNC		O_TRUNC
+#define	FOFFMAX		O_LARGEFILE
+#define	FSYNC		O_SYNC
+#define	FDSYNC		O_DSYNC
+#define	FRSYNC		O_SYNC
+#define	FEXCL		O_EXCL
+#define	FDIRECT		O_DIRECT
+#define	FAPPEND		O_APPEND
+
+#define	FNODSYNC	0x10000 /* fsync pseudo flag */
+#define	FNOFOLLOW	0x20000 /* don't follow symlinks */
+
+#define	F_FREESP	11 	/* Free file space */
+
+
+/*
+ * The vnode AT_ flags are mapped to the Linux ATTR_* flags.
+ * This allows them to be used safely with an iattr structure.
+ * The AT_XVATTR flag has been added and mapped to the upper
+ * bit range to avoid conflicting with the standard Linux set.
+ */
+#undef AT_UID
+#undef AT_GID
+
+#define	AT_MODE		ATTR_MODE
+#define	AT_UID		ATTR_UID
+#define	AT_GID		ATTR_GID
+#define	AT_SIZE		ATTR_SIZE
+#define	AT_ATIME	ATTR_ATIME
+#define	AT_MTIME	ATTR_MTIME
+#define	AT_CTIME	ATTR_CTIME
+
+#define	ATTR_XVATTR	(1 << 31)
+#define	AT_XVATTR	ATTR_XVATTR
+
+#define	ATTR_IATTR_MASK	(ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_SIZE | \
+			ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_FILE)
+
+#define	CRCREAT		0x01
+#define	RMFILE		0x02
+
+#define	B_INVAL		0x01
+#define	B_TRUNC		0x02
+
+#define	LOOKUP_DIR		0x01
+#define	LOOKUP_XATTR		0x02
+#define	CREATE_XATTR_DIR	0x04
+#define	ATTR_NOACLCHECK		0x20
+
+typedef enum vtype {
+	VNON		= 0,
+	VREG		= 1,
+	VDIR		= 2,
+	VBLK		= 3,
+	VCHR		= 4,
+	VLNK		= 5,
+	VFIFO		= 6,
+	VDOOR		= 7,
+	VPROC		= 8,
+	VSOCK		= 9,
+	VPORT		= 10,
+	VBAD		= 11
+} vtype_t;
+
+typedef struct vattr {
+	enum vtype	va_type;	/* vnode type */
+	uint_t		va_mask;	/* attribute bit-mask */
+	ushort_t	va_mode;	/* acc mode */
+	uid_t		va_uid;		/* owner uid */
+	gid_t		va_gid;		/* owner gid */
+	long		va_fsid;	/* fs id */
+	long		va_nodeid;	/* node # */
+	uint32_t	va_nlink;	/* # links */
+	uint64_t	va_size;	/* file size */
+	struct timespec	va_atime;	/* last acc */
+	struct timespec	va_mtime;	/* last mod */
+	struct timespec	va_ctime;	/* last chg */
+	dev_t		va_rdev;	/* dev */
+	uint64_t	va_nblocks;	/* space used */
+	uint32_t	va_blksize;	/* block size */
+	uint32_t	va_seq;		/* sequence */
+	struct dentry	*va_dentry;	/* dentry to wire */
+} vattr_t;
+
+typedef struct vnode {
+	struct file	*v_file;
+	kmutex_t	v_lock;		/* protects vnode fields */
+	uint_t		v_flag;		/* vnode flags (see below) */
+	uint_t		v_count;	/* reference count */
+	void		*v_data;	/* private data for fs */
+	struct vfs	*v_vfsp;	/* ptr to containing VFS */
+	struct stdata	*v_stream;	/* associated stream */
+	enum vtype	v_type;		/* vnode type */
+	dev_t		v_rdev;		/* device (VCHR, VBLK) */
+	gfp_t		v_gfp_mask;	/* original mapping gfp mask */
+} vnode_t;
+
+typedef struct vn_file {
+	int		f_fd;		/* linux fd for lookup */
+	struct task_struct *f_task;	/* linux task this fd belongs to */
+	struct file	*f_file;	/* linux file struct */
+	atomic_t	f_ref;		/* ref count */
+	kmutex_t	f_lock;		/* struct lock */
+	loff_t		f_offset;	/* offset */
+	vnode_t		*f_vnode;	/* vnode */
+	struct list_head f_list;	/* list referenced file_t's */
+} file_t;
+
+extern vnode_t *vn_alloc(int flag);
+void vn_free(vnode_t *vp);
+extern vtype_t vn_mode_to_vtype(mode_t);
+extern mode_t vn_vtype_to_mode(vtype_t);
+extern int vn_open(const char *path, uio_seg_t seg, int flags, int mode,
+    vnode_t **vpp, int x1, void *x2);
+extern int vn_openat(const char *path, uio_seg_t seg, int flags, int mode,
+    vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd);
+extern int vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len,
+    offset_t off, uio_seg_t seg, int x1, rlim64_t x2,
+    void *x3, ssize_t *residp);
+extern int vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4);
+extern int vn_seek(vnode_t *vp, offset_t o, offset_t *op, void *ct);
+
+extern int vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4);
+extern int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4);
+extern int vn_space(vnode_t *vp, int cmd, struct flock *bfp, int flag,
+    offset_t offset, void *x6, void *x7);
+extern file_t *vn_getf(int fd);
+extern void vn_releasef(int fd);
+extern void vn_areleasef(int fd, uf_info_t *fip);
+extern int vn_set_pwd(const char *filename);
+
+int spl_vn_init(void);
+void spl_vn_fini(void);
+
+#define	VOP_CLOSE				vn_close
+#define	VOP_SEEK				vn_seek
+#define	VOP_GETATTR				vn_getattr
+#define	VOP_FSYNC				vn_fsync
+#define	VOP_SPACE				vn_space
+#define	VOP_PUTPAGE(vp, o, s, f, x1, x2)	((void)0)
+#define	vn_is_readonly(vp)			0
+#define	getf					vn_getf
+#define	releasef				vn_releasef
+#define	areleasef				vn_areleasef
+
+extern vnode_t *rootdir;
+
+#endif /* SPL_VNODE_H */
diff --git a/include/spl/sys/wait.h b/include/spl/sys/wait.h
new file mode 100644
index 000000000..5311ff8b9
--- /dev/null
+++ b/include/spl/sys/wait.h
@@ -0,0 +1,55 @@
+/*
+ *  Copyright (C) 2007-2014 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_WAIT_H
+#define	_SPL_WAIT_H
+
+#include <linux/sched.h>
+#include <linux/wait.h>
+
+#ifndef HAVE_WAIT_ON_BIT_ACTION
+#define	spl_wait_on_bit(word, bit, mode)	wait_on_bit(word, bit, mode)
+#else
+
+static inline int
+spl_bit_wait(void *word)
+{
+	schedule();
+	return (0);
+}
+
+#define	spl_wait_on_bit(word, bit, mode)		\
+	wait_on_bit(word, bit, spl_bit_wait, mode)
+
+#endif /* HAVE_WAIT_ON_BIT_ACTION */
+
+#ifdef HAVE_WAIT_QUEUE_ENTRY_T
+typedef wait_queue_head_t	spl_wait_queue_head_t;
+typedef wait_queue_entry_t	spl_wait_queue_entry_t;
+#else
+typedef wait_queue_head_t	spl_wait_queue_head_t;
+typedef wait_queue_t		spl_wait_queue_entry_t;
+#endif
+
+#endif /* SPL_WAIT_H */
diff --git a/include/spl/sys/zmod.h b/include/spl/sys/zmod.h
new file mode 100644
index 000000000..95c1a3ed7
--- /dev/null
+++ b/include/spl/sys/zmod.h
@@ -0,0 +1,78 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ *  z_compress_level/z_uncompress are nearly identical copies of the
+ *  compress2/uncompress functions provided by the official zlib package
+ *  available at http://zlib.net/.  The only changes made we to slightly
+ *  adapt the functions called to match the linux kernel implementation
+ *  of zlib.  The full zlib license follows:
+ *
+ *  zlib.h -- interface of the 'zlib' general purpose compression library
+ *  version 1.2.5, April 19th, 2010
+ *
+ *  Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
+ *
+ *  This software is provided 'as-is', without any express or implied
+ *  warranty.  In no event will the authors be held liable for any damages
+ *  arising from the use of this software.
+ *
+ *  Permission is granted to anyone to use this software for any purpose,
+ *  including commercial applications, and to alter it and redistribute it
+ *  freely, subject to the following restrictions:
+ *
+ *  1. The origin of this software must not be misrepresented; you must not
+ *     claim that you wrote the original software. If you use this software
+ *     in a product, an acknowledgment in the product documentation would be
+ *     appreciated but is not required.
+ *  2. Altered source versions must be plainly marked as such, and must not be
+ *     misrepresented as being the original software.
+ *  3. This notice may not be removed or altered from any source distribution.
+ *
+ *  Jean-loup Gailly
+ *  Mark Adler
+ */
+
+#ifndef _SPL_ZMOD_H
+#define	_SPL_ZMOD_H
+
+#include <sys/types.h>
+#include <linux/zlib.h>
+
+#ifdef HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
+#define	spl_zlib_deflate_workspacesize(wb, ml) \
+	zlib_deflate_workspacesize(wb, ml)
+#else
+#define	spl_zlib_deflate_workspacesize(wb, ml) \
+	zlib_deflate_workspacesize()
+#endif /* HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE */
+
+extern int z_compress_level(void *dest, size_t *destLen, const void *source,
+    size_t sourceLen, int level);
+extern int z_uncompress(void *dest, size_t *destLen, const void *source,
+    size_t sourceLen);
+
+int spl_zlib_init(void);
+void spl_zlib_fini(void);
+
+#endif /* SPL_ZMOD_H */
diff --git a/include/spl/sys/zone.h b/include/spl/sys/zone.h
new file mode 100644
index 000000000..b2efd13b8
--- /dev/null
+++ b/include/spl/sys/zone.h
@@ -0,0 +1,36 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <[email protected]>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_ZONE_H
+#define	_SPL_ZONE_H
+
+#include <sys/byteorder.h>
+
+#define	GLOBAL_ZONEID			0
+
+#define	zone_dataset_visible(x, y)	(1)
+#define	crgetzoneid(x)			(GLOBAL_ZONEID)
+#define	INGLOBALZONE(z)			(1)
+
+#endif /* SPL_ZONE_H */