xref: /openbmc/linux/fs/dlm/memory.c (revision 64c70b1c)
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_zalloc(lkb_cache, GFP_KERNEL);
80 	return lkb;
81 }
82 
83 void free_lkb(struct dlm_lkb *lkb)
84 {
85 	if (lkb->lkb_flags & DLM_IFL_USER) {
86 		struct dlm_user_args *ua;
87 		ua = (struct dlm_user_args *)lkb->lkb_astparam;
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 
97 struct dlm_direntry *allocate_direntry(struct dlm_ls *ls, int namelen)
98 {
99 	struct dlm_direntry *de;
100 
101 	DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,
102 		   printk("namelen = %d\n", namelen););
103 
104 	de = kmalloc(sizeof(*de) + namelen, GFP_KERNEL);
105 	if (de)
106 		memset(de, 0, sizeof(*de) + namelen);
107 	return de;
108 }
109 
110 void free_direntry(struct dlm_direntry *de)
111 {
112 	kfree(de);
113 }
114 
115