Add linux libspl support

All changes needed for the libspl layer.  This includes modifications
to files directly copied from OpenSolaris and the addition of new
files needed to fill in the gaps.

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

1 files changed, 195 insertions, 0 deletions

diff --git a/lib/libspl/include/umem.h b/lib/libspl/include/umem.h
new file mode 100644
index 000000000..87db1f451
--- /dev/null
+++ b/lib/libspl/include/umem.h
@@ -0,0 +1,195 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _LIBSPL_UMEM_H
+#define _LIBSPL_UMEM_H
+
+/* XXX: We should use the real portable umem library if it is detected
+ * at configure time.  However, if the library is not available we can
+ * use a trivial malloc based implementation.  This obviously impacts
+ * performance but unless you using a full userspace build of zpool for
+ * something other than ztest your likely not going to notice or care.
+ *
+ * https://labs.omniti.com/trac/portableumem
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+typedef void vmem_t;
+
+/*
+ * Flags for umem_alloc/umem_free
+ */
+#define UMEM_DEFAULT		0x0000  /* normal -- may fail */
+#define UMEM_NOFAIL		0x0100  /* Never fails */
+
+/*
+ * Flags for umem_cache_create()
+ */
+#define UMC_NOTOUCH		0x00010000
+#define UMC_NODEBUG		0x00020000
+#define UMC_NOMAGAZINE		0x00040000
+#define UMC_NOHASH		0x00080000
+
+#define UMEM_CACHE_NAMELEN	31
+
+typedef int umem_nofail_callback_t(void);
+typedef int umem_constructor_t(void *, void *, int);
+typedef void umem_destructor_t(void *, void *);
+typedef void umem_reclaim_t(void *);
+
+typedef struct umem_cache {
+	char			cache_name[UMEM_CACHE_NAMELEN + 1];
+	size_t			cache_bufsize;
+	size_t			cache_align;
+	umem_constructor_t	*cache_constructor;
+	umem_destructor_t	*cache_destructor;
+	umem_reclaim_t		*cache_reclaim;
+	void			*cache_private;
+	void			*cache_arena;
+	int			cache_cflags;
+} umem_cache_t;
+
+static inline void *
+umem_alloc(size_t size, int flags)
+{
+	void *ptr;
+
+	do {
+		ptr = malloc(size);
+	} while (ptr == NULL && (flags & UMEM_NOFAIL));
+
+	return ptr;
+}
+
+static inline void *
+umem_alloc_aligned(size_t size, size_t align, int flags)
+{
+	void *ptr;
+	int rc;
+
+	do {
+		rc = posix_memalign(&ptr, align, size);
+	} while (rc == ENOMEM && (flags & UMEM_NOFAIL));
+
+	if (rc == EINVAL) {
+		fprintf(stderr, "%s: invalid memory alignment (%zd)\n",
+		    __func__, align);
+		if (flags & UMEM_NOFAIL)
+			abort();
+		return NULL;
+	}
+
+	return ptr;
+}
+
+static inline void *
+umem_zalloc(size_t size, int flags)
+{
+	void *ptr;
+
+	ptr = umem_alloc(size, flags);
+	if (ptr)
+		memset(ptr, 0, size);
+
+	return ptr;
+}
+
+static inline void
+umem_free(void *ptr, size_t size)
+{
+	free(ptr);
+}
+
+static inline void
+umem_nofail_callback(umem_nofail_callback_t *cb) {}
+
+static inline umem_cache_t *
+umem_cache_create(char *name, size_t bufsize, size_t align,
+                  umem_constructor_t *constructor,
+                  umem_destructor_t *destructor,
+                  umem_reclaim_t *reclaim,
+		  void *priv, void *vmp, int cflags)
+{
+	umem_cache_t *cp;
+
+	cp = umem_alloc(sizeof(umem_cache_t), UMEM_DEFAULT);
+	if (cp) {
+		strncpy(cp->cache_name, name, UMEM_CACHE_NAMELEN);
+		cp->cache_bufsize = bufsize;
+		cp->cache_align = align;
+		cp->cache_constructor = constructor;
+		cp->cache_destructor = destructor;
+		cp->cache_reclaim = reclaim;
+		cp->cache_private = priv;
+		cp->cache_arena = vmp;
+		cp->cache_cflags = cflags;
+	}
+
+	return cp;
+}
+
+static inline void
+umem_cache_destroy(umem_cache_t *cp)
+{
+	umem_free(cp, sizeof(umem_cache_t));
+}
+
+static inline void *
+umem_cache_alloc(umem_cache_t *cp, int flags)
+{
+	void *ptr;
+
+	if (cp->cache_align != 0)
+		ptr = umem_alloc_aligned(cp->cache_bufsize, cp->cache_align, flags);
+	else
+		ptr = umem_alloc(cp->cache_bufsize, flags);
+
+	if (ptr && cp->cache_constructor)
+		cp->cache_constructor(ptr, cp->cache_private, UMEM_DEFAULT);
+
+	return ptr;
+}
+
+static inline void
+umem_cache_free(umem_cache_t *cp, void *ptr)
+{
+	if (cp->cache_destructor)
+		cp->cache_destructor(ptr, cp->cache_private);
+
+	umem_free(ptr, cp->cache_bufsize);
+}
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif