LXR linux/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
  18static struct kmem_cache *lkb_cache;
  19
  20
  21int __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
  32void dlm_memory_exit(void)
  33{
  34        if (lkb_cache)
  35                kmem_cache_destroy(lkb_cache);
  36}
  37
  38char *dlm_allocate_lvb(struct dlm_ls *ls)
  39{
  40        char *p;
  41
  42        p = kzalloc(ls->ls_lvblen, GFP_NOFS);
  43        return p;
  44}
  45
  46void 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
  54struct 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_NOFS);
  61        return r;
  62}
  63
  64void 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
  71struct dlm_lkb *dlm_allocate_lkb(struct dlm_ls *ls)
  72{
  73        struct dlm_lkb *lkb;
  74
  75        lkb = kmem_cache_zalloc(lkb_cache, GFP_NOFS);
  76        return lkb;
  77}
  78
  79void 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
  93