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/*
* 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 are using a full userspace build of zpool for
* something other than ztest, you are 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
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