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
  20
  21 int __init 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);
  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 *dlm_allocate_lvb(struct dlm_ls *ls)
  39 {
  40         char *p;
  41
  42         p = kzalloc(ls->ls_lvblen, GFP_KERNEL);
  43         return p;
  44 }
  45
  46 void dlm_free_lvb(char *p)
  47 {
  48         kfree(p);
  49 }
  50
  51 /* FIXME: have some minimal space built-in to rsb for the name and
  52    kmalloc a separate name if needed, like dentries are done */
  53
  54 struct dlm_rsb *dlm_allocate_rsb(struct dlm_ls *ls, int namelen)
  55 {
  56         struct dlm_rsb *r;
  57
  58         DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,);
  59
  60         r = kzalloc(sizeof(*r) + namelen, GFP_KERNEL);
  61         return r;
  62 }
  63
  64 void dlm_free_rsb(struct dlm_rsb *r)
  65 {
  66         if (r->res_lvbptr)
  67                 dlm_free_lvb(r->res_lvbptr);
  68         kfree(r);
  69 }
  70
  71 struct dlm_lkb *dlm_allocate_lkb(struct dlm_ls *ls)
  72 {
  73         struct dlm_lkb *lkb;
  74
  75         lkb = kmem_cache_zalloc(lkb_cache, GFP_KERNEL);
  76         return lkb;
  77 }
  78
  79 void dlm_free_lkb(struct dlm_lkb *lkb)
  80 {
  81         if (lkb->lkb_flags & DLM_IFL_USER) {
  82                 struct dlm_user_args *ua;
  83                 ua = lkb->lkb_ua;
  84                 if (ua) {
  85                         if (ua->lksb.sb_lvbptr)
  86                                 kfree(ua->lksb.sb_lvbptr);
  87                         kfree(ua);
  88                 }
  89         }
  90         kmem_cache_free(lkb_cache, lkb);
  91 }
  92