lib/libspl/include/umem.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _LIBSPL_UMEM_H
  28 #define _LIBSPL_UMEM_H
  29
  30 /*
  31  * XXX: We should use the real portable umem library if it is detected
  32  * at configure time.  However, if the library is not available, we can
  33  * use a trivial malloc based implementation.  This obviously impacts
  34  * performance, but unless you are using a full userspace build of zpool for
  35  * something other than ztest, you are likely not going to notice or care.
  36  *
  37  * https://labs.omniti.com/trac/portableumem
  38  */
  39
  40 #include <stdlib.h>
  41 #include <stdio.h>
  42
  43 #ifdef  __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 typedef void vmem_t;
  48
  49 /*
  50  * Flags for umem_alloc/umem_free
  51  */
  52 #define UMEM_DEFAULT            0x0000  /* normal -- may fail */
  53 #define UMEM_NOFAIL             0x0100  /* Never fails */
  54
  55 /*
  56  * Flags for umem_cache_create()
  57  */
  58 #define UMC_NOTOUCH             0x00010000
  59 #define UMC_NODEBUG             0x00020000
  60 #define UMC_NOMAGAZINE          0x00040000
  61 #define UMC_NOHASH              0x00080000
  62
  63 #define UMEM_CACHE_NAMELEN      31
  64
  65 typedef int umem_nofail_callback_t(void);
  66 typedef int umem_constructor_t(void *, void *, int);
  67 typedef void umem_destructor_t(void *, void *);
  68 typedef void umem_reclaim_t(void *);
  69
  70 typedef struct umem_cache {
  71         char                    cache_name[UMEM_CACHE_NAMELEN + 1];
  72         size_t                  cache_bufsize;
  73         size_t                  cache_align;
  74         umem_constructor_t      *cache_constructor;
  75         umem_destructor_t       *cache_destructor;
  76         umem_reclaim_t          *cache_reclaim;
  77         void                    *cache_private;
  78         void                    *cache_arena;
  79         int                     cache_cflags;
  80 } umem_cache_t;
  81
  82 static inline void *
  83 umem_alloc(size_t size, int flags)
  84 {
  85         void *ptr;
  86
  87         do {
  88                 ptr = malloc(size);
  89         } while (ptr == NULL && (flags & UMEM_NOFAIL));
  90
  91         return (ptr);
  92 }
  93
  94 static inline void *
  95 umem_alloc_aligned(size_t size, size_t align, int flags)
  96 {
  97         void *ptr;
  98         int rc;
  99
 100         do {
 101                 rc = posix_memalign(&ptr, align, size);
 102         } while (rc == ENOMEM && (flags & UMEM_NOFAIL));
 103
 104         if (rc == EINVAL) {
 105                 fprintf(stderr, "%s: invalid memory alignment (%zd)\n",
 106                     __func__, align);
 107                 if (flags & UMEM_NOFAIL)
 108                         abort();
 109                 return (NULL);
 110         }
 111
 112         return (ptr);
 113 }
 114
 115 static inline void *
 116 umem_zalloc(size_t size, int flags)
 117 {
 118         void *ptr;
 119
 120         ptr = umem_alloc(size, flags);
 121         if (ptr)
 122                 memset(ptr, 0, size);
 123
 124         return (ptr);
 125 }
 126
 127 static inline void
 128 umem_free(void *ptr, size_t size)
 129 {
 130         free(ptr);
 131 }
 132
 133 static inline void
 134 umem_nofail_callback(umem_nofail_callback_t *cb) {}
 135
 136 static inline umem_cache_t *
 137 umem_cache_create(
 138     char *name, size_t bufsize, size_t align,
 139     umem_constructor_t *constructor,
 140     umem_destructor_t *destructor,
 141     umem_reclaim_t *reclaim,
 142     void *priv, void *vmp, int cflags)
 143 {
 144         umem_cache_t *cp;
 145
 146         cp = umem_alloc(sizeof (umem_cache_t), UMEM_DEFAULT);
 147         if (cp) {
 148                 strncpy(cp->cache_name, name, UMEM_CACHE_NAMELEN);
 149                 cp->cache_bufsize = bufsize;
 150                 cp->cache_align = align;
 151                 cp->cache_constructor = constructor;
 152                 cp->cache_destructor = destructor;
 153                 cp->cache_reclaim = reclaim;
 154                 cp->cache_private = priv;
 155                 cp->cache_arena = vmp;
 156                 cp->cache_cflags = cflags;
 157         }
 158
 159         return (cp);
 160 }
 161
 162 static inline void
 163 umem_cache_destroy(umem_cache_t *cp)
 164 {
 165         umem_free(cp, sizeof (umem_cache_t));
 166 }
 167
 168 static inline void *
 169 umem_cache_alloc(umem_cache_t *cp, int flags)
 170 {
 171         void *ptr;
 172
 173         if (cp->cache_align != 0)
 174                 ptr = umem_alloc_aligned(
 175                     cp->cache_bufsize, cp->cache_align, flags);
 176         else
 177                 ptr = umem_alloc(cp->cache_bufsize, flags);
 178
 179         if (ptr && cp->cache_constructor)
 180                 cp->cache_constructor(ptr, cp->cache_private, UMEM_DEFAULT);
 181
 182         return (ptr);
 183 }
 184
 185 static inline void
 186 umem_cache_free(umem_cache_t *cp, void *ptr)
 187 {
 188         if (cp->cache_destructor)
 189                 cp->cache_destructor(ptr, cp->cache_private);
 190
 191         umem_free(ptr, cp->cache_bufsize);
 192 }
 193
 194 #ifdef  __cplusplus
 195 }
 196 #endif
 197
 198 #endif