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 #include <string.h>
  43
  44 #ifdef  __cplusplus
  45 extern "C" {
  46 #endif
  47
  48 typedef void vmem_t;
  49
  50 /*
  51  * Flags for umem_alloc/umem_free
  52  */
  53 #define UMEM_DEFAULT            0x0000  /* normal -- may fail */
  54 #define UMEM_NOFAIL             0x0100  /* Never fails */
  55
  56 /*
  57  * Flags for umem_cache_create()
  58  */
  59 #define UMC_NOTOUCH             0x00010000
  60 #define UMC_NODEBUG             0x00020000
  61 #define UMC_NOMAGAZINE          0x00040000
  62 #define UMC_NOHASH              0x00080000
  63
  64 #define UMEM_CACHE_NAMELEN      31
  65
  66 typedef int umem_nofail_callback_t(void);
  67 typedef int umem_constructor_t(void *, void *, int);
  68 typedef void umem_destructor_t(void *, void *);
  69 typedef void umem_reclaim_t(void *);
  70
  71 typedef struct umem_cache {
  72         char                    cache_name[UMEM_CACHE_NAMELEN + 1];
  73         size_t                  cache_bufsize;
  74         size_t                  cache_align;
  75         umem_constructor_t      *cache_constructor;
  76         umem_destructor_t       *cache_destructor;
  77         umem_reclaim_t          *cache_reclaim;
  78         void                    *cache_private;
  79         void                    *cache_arena;
  80         int                     cache_cflags;
  81 } umem_cache_t;
  82
  83 static inline void *
  84 umem_alloc(size_t size, int flags)
  85 {
  86         void *ptr = NULL;
  87
  88         do {
  89                 ptr = malloc(size);
  90         } while (ptr == NULL && (flags & UMEM_NOFAIL));
  91
  92         return (ptr);
  93 }
  94
  95 static inline void *
  96 umem_alloc_aligned(size_t size, size_t align, int flags)
  97 {
  98         void *ptr = NULL;
  99         int rc = EINVAL;
 100
 101         do {
 102                 rc = posix_memalign(&ptr, align, size);
 103         } while (rc == ENOMEM && (flags & UMEM_NOFAIL));
 104
 105         if (rc == EINVAL) {
 106                 fprintf(stderr, "%s: invalid memory alignment (%zd)\n",
 107                     __func__, align);
 108                 if (flags & UMEM_NOFAIL)
 109                         abort();
 110                 return (NULL);
 111         }
 112
 113         return (ptr);
 114 }
 115
 116 static inline void *
 117 umem_zalloc(size_t size, int flags)
 118 {
 119         void *ptr = NULL;
 120
 121         ptr = umem_alloc(size, flags);
 122         if (ptr)
 123                 memset(ptr, 0, size);
 124
 125         return (ptr);
 126 }
 127
 128 static inline void
 129 umem_free(void *ptr, size_t size)
 130 {
 131         free(ptr);
 132 }
 133
 134 static inline void
 135 umem_nofail_callback(umem_nofail_callback_t *cb)
 136 {}
 137
 138 static inline umem_cache_t *
 139 umem_cache_create(
 140     char *name, size_t bufsize, size_t align,
 141     umem_constructor_t *constructor,
 142     umem_destructor_t *destructor,
 143     umem_reclaim_t *reclaim,
 144     void *priv, void *vmp, int cflags)
 145 {
 146         umem_cache_t *cp;
 147
 148         cp = (umem_cache_t *)umem_alloc(sizeof (umem_cache_t), UMEM_DEFAULT);
 149         if (cp) {
 150                 strlcpy(cp->cache_name, name, UMEM_CACHE_NAMELEN);
 151                 cp->cache_bufsize = bufsize;
 152                 cp->cache_align = align;
 153                 cp->cache_constructor = constructor;
 154                 cp->cache_destructor = destructor;
 155                 cp->cache_reclaim = reclaim;
 156                 cp->cache_private = priv;
 157                 cp->cache_arena = vmp;
 158                 cp->cache_cflags = cflags;
 159         }
 160
 161         return (cp);
 162 }
 163
 164 static inline void
 165 umem_cache_destroy(umem_cache_t *cp)
 166 {
 167         umem_free(cp, sizeof (umem_cache_t));
 168 }
 169
 170 static inline void *
 171 umem_cache_alloc(umem_cache_t *cp, int flags)
 172 {
 173         void *ptr = NULL;
 174
 175         if (cp->cache_align != 0)
 176                 ptr = umem_alloc_aligned(
 177                     cp->cache_bufsize, cp->cache_align, flags);
 178         else
 179                 ptr = umem_alloc(cp->cache_bufsize, flags);
 180
 181         if (ptr && cp->cache_constructor)
 182                 cp->cache_constructor(ptr, cp->cache_private, UMEM_DEFAULT);
 183
 184         return (ptr);
 185 }
 186
 187 static inline void
 188 umem_cache_free(umem_cache_t *cp, void *ptr)
 189 {
 190         if (cp->cache_destructor)
 191                 cp->cache_destructor(ptr, cp->cache_private);
 192
 193         umem_free(ptr, cp->cache_bufsize);
 194 }
 195
 196 static inline void
 197 umem_cache_reap_now(umem_cache_t *cp)
 198 {
 199 }
 200
 201 #ifdef  __cplusplus
 202 }
 203 #endif
 204
 205 #endif