fs/dlm/memory.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
   6 **
   7 **  This copyrighted material is made available to anyone wishing to use,
   8 **  modify, copy, or redistribute it subject to the terms and conditions
   9 **  of the GNU General Public License v.2.
  10 **
  11 *******************************************************************************
  12 ******************************************************************************/
  13
  14 #include "dlm_internal.h"
  15 #include "config.h"
  16 #include "memory.h"
  17
  18 static struct kmem_cache *lkb_cache;
  19
  20
  21 int dlm_memory_init(void)
  22 {
  23         int ret = 0;
  24
  25         lkb_cache = kmem_cache_create("dlm_lkb", sizeof(struct dlm_lkb),
  26                                 __alignof__(struct dlm_lkb), 0, NULL, NULL);
  27         if (!lkb_cache)
  28                 ret = -ENOMEM;
  29         return ret;
  30 }
  31
  32 void dlm_memory_exit(void)
  33 {
  34         if (lkb_cache)
  35                 kmem_cache_destroy(lkb_cache);
  36 }
  37
  38 char *allocate_lvb(struct dlm_ls *ls)
  39 {
  40         char *p;
  41
  42         p = kmalloc(ls->ls_lvblen, GFP_KERNEL);
  43         if (p)
  44                 memset(p, 0, ls->ls_lvblen);
  45         return p;
  46 }
  47
  48 void free_lvb(char *p)
  49 {
  50         kfree(p);
  51 }
  52
  53 /* FIXME: have some minimal space built-in to rsb for the name and
  54    kmalloc a separate name if needed, like dentries are done */
  55
  56 struct dlm_rsb *allocate_rsb(struct dlm_ls *ls, int namelen)
  57 {
  58         struct dlm_rsb *r;
  59
  60         DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,);
  61
  62         r = kmalloc(sizeof(*r) + namelen, GFP_KERNEL);
  63         if (r)
  64                 memset(r, 0, sizeof(*r) + namelen);
  65         return r;
  66 }
  67
  68 void free_rsb(struct dlm_rsb *r)
  69 {
  70         if (r->res_lvbptr)
  71                 free_lvb(r->res_lvbptr);
  72         kfree(r);
  73 }
  74
  75 struct dlm_lkb *allocate_lkb(struct dlm_ls *ls)
  76 {
  77         struct dlm_lkb *lkb;
  78
  79         lkb = kmem_cache_alloc(lkb_cache, GFP_KERNEL);
  80         if (lkb)
  81                 memset(lkb, 0, sizeof(*lkb));
  82         return lkb;
  83 }
  84
  85 void free_lkb(struct dlm_lkb *lkb)
  86 {
  87         if (lkb->lkb_flags & DLM_IFL_USER) {
  88                 struct dlm_user_args *ua;
  89                 ua = (struct dlm_user_args *)lkb->lkb_astparam;
  90                 if (ua) {
  91                         if (ua->lksb.sb_lvbptr)
  92                                 kfree(ua->lksb.sb_lvbptr);
  93                         kfree(ua);
  94                 }
  95         }
  96         kmem_cache_free(lkb_cache, lkb);
  97 }
  98
  99 struct dlm_direntry *allocate_direntry(struct dlm_ls *ls, int namelen)
 100 {
 101         struct dlm_direntry *de;
 102
 103         DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,
 104                    printk("namelen = %d\n", namelen););
 105
 106         de = kmalloc(sizeof(*de) + namelen, GFP_KERNEL);
 107         if (de)
 108                 memset(de, 0, sizeof(*de) + namelen);
 109         return de;
 110 }
 111
 112 void free_direntry(struct dlm_direntry *de)
 113 {
 114         kfree(de);
 115 }
 116