kernel/fs/dlm/memory.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2007 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 static struct kmem_cache *rsb_cache;
  20
  21
  22 int __init dlm_memory_init(void)
  23 {
  24         lkb_cache = kmem_cache_create("dlm_lkb", sizeof(struct dlm_lkb),
  25                                 __alignof__(struct dlm_lkb), 0, NULL);
  26         if (!lkb_cache)
  27                 return -ENOMEM;
  28
  29         rsb_cache = kmem_cache_create("dlm_rsb", sizeof(struct dlm_rsb),
  30                                 __alignof__(struct dlm_rsb), 0, NULL);
  31         if (!rsb_cache) {
  32                 kmem_cache_destroy(lkb_cache);
  33                 return -ENOMEM;
  34         }
  35
  36         return 0;
  37 }
  38
  39 void dlm_memory_exit(void)
  40 {
  41         if (lkb_cache)
  42                 kmem_cache_destroy(lkb_cache);
  43         if (rsb_cache)
  44                 kmem_cache_destroy(rsb_cache);
  45 }
  46
  47 char *dlm_allocate_lvb(struct dlm_ls *ls)
  48 {
  49         char *p;
  50
  51         p = kzalloc(ls->ls_lvblen, GFP_NOFS);
  52         return p;
  53 }
  54
  55 void dlm_free_lvb(char *p)
  56 {
  57         kfree(p);
  58 }
  59
  60 struct dlm_rsb *dlm_allocate_rsb(struct dlm_ls *ls)
  61 {
  62         struct dlm_rsb *r;
  63
  64         r = kmem_cache_zalloc(rsb_cache, GFP_NOFS);
  65         return r;
  66 }
  67
  68 void dlm_free_rsb(struct dlm_rsb *r)
  69 {
  70         if (r->res_lvbptr)
  71                 dlm_free_lvb(r->res_lvbptr);
  72         kmem_cache_free(rsb_cache, r);
  73 }
  74
  75 struct dlm_lkb *dlm_allocate_lkb(struct dlm_ls *ls)
  76 {
  77         struct dlm_lkb *lkb;
  78
  79         lkb = kmem_cache_zalloc(lkb_cache, GFP_NOFS);
  80         return lkb;
  81 }
  82
  83 void dlm_free_lkb(struct dlm_lkb *lkb)
  84 {
  85         if (lkb->lkb_flags & DLM_IFL_USER) {
  86                 struct dlm_user_args *ua;
  87                 ua = lkb->lkb_ua;
  88                 if (ua) {
  89                         if (ua->lksb.sb_lvbptr)
  90                                 kfree(ua->lksb.sb_lvbptr);
  91                         kfree(ua);
  92                 }
  93         }
  94         kmem_cache_free(lkb_cache, lkb);
  95 }
  96