dlm: improve rsb searches
[linux-2.6.git] / 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         int ret = 0;
25
26         lkb_cache = kmem_cache_create("dlm_lkb", sizeof(struct dlm_lkb),
27                                 __alignof__(struct dlm_lkb), 0, NULL);
28         if (!lkb_cache)
29                 ret = -ENOMEM;
30
31         rsb_cache = kmem_cache_create("dlm_rsb", sizeof(struct dlm_rsb),
32                                 __alignof__(struct dlm_rsb), 0, NULL);
33         if (!rsb_cache) {
34                 kmem_cache_destroy(lkb_cache);
35                 ret = -ENOMEM;
36         }
37
38         return ret;
39 }
40
41 void dlm_memory_exit(void)
42 {
43         if (lkb_cache)
44                 kmem_cache_destroy(lkb_cache);
45         if (rsb_cache)
46                 kmem_cache_destroy(rsb_cache);
47 }
48
49 char *dlm_allocate_lvb(struct dlm_ls *ls)
50 {
51         char *p;
52
53         p = kzalloc(ls->ls_lvblen, GFP_NOFS);
54         return p;
55 }
56
57 void dlm_free_lvb(char *p)
58 {
59         kfree(p);
60 }
61
62 struct dlm_rsb *dlm_allocate_rsb(struct dlm_ls *ls)
63 {
64         struct dlm_rsb *r;
65
66         r = kmem_cache_zalloc(rsb_cache, GFP_NOFS);
67         return r;
68 }
69
70 void dlm_free_rsb(struct dlm_rsb *r)
71 {
72         if (r->res_lvbptr)
73                 dlm_free_lvb(r->res_lvbptr);
74         kmem_cache_free(rsb_cache, r);
75 }
76
77 struct dlm_lkb *dlm_allocate_lkb(struct dlm_ls *ls)
78 {
79         struct dlm_lkb *lkb;
80
81         lkb = kmem_cache_zalloc(lkb_cache, GFP_NOFS);
82         return lkb;
83 }
84
85 void dlm_free_lkb(struct dlm_lkb *lkb)
86 {
87         if (lkb->lkb_flags & DLM_IFL_USER) {
88                 struct dlm_user_args *ua;
89                 ua = lkb->lkb_ua;
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