1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #ifndef __XFS_SUPPORT_KMEM_H__
19 #define __XFS_SUPPORT_KMEM_H__
20
21 #include <linux/slab.h>
22 #include <linux/sched.h>
23 #include <linux/mm.h>
24 #include <linux/vmalloc.h>
25
26 /*
27 * General memory allocation interfaces
28 */
29
30 #define KM_SLEEP 0x0001u
31 #define KM_NOSLEEP 0x0002u
32 #define KM_NOFS 0x0004u
33 #define KM_MAYFAIL 0x0008u
34
35 /*
36 * We use a special process flag to avoid recursive callbacks into
37 * the filesystem during transactions. We will also issue our own
38 * warnings, so we explicitly skip any generic ones (silly of us).
39 */
40 static inline gfp_t
kmem_flags_convert(unsigned int __nocast flags)41 kmem_flags_convert(unsigned int __nocast flags)
42 {
43 gfp_t lflags;
44
45 BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL));
46
47 if (flags & KM_NOSLEEP) {
48 lflags = GFP_ATOMIC | __GFP_NOWARN;
49 } else {
50 lflags = GFP_KERNEL | __GFP_NOWARN;
51 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
52 lflags &= ~__GFP_FS;
53 }
54 return lflags;
55 }
56
57 extern void *kmem_alloc(size_t, unsigned int __nocast);
58 extern void *kmem_zalloc(size_t, unsigned int __nocast);
59 extern void *kmem_realloc(const void *, size_t, size_t, unsigned int __nocast);
60 extern void kmem_free(const void *);
61
kmem_zalloc_large(size_t size)62 static inline void *kmem_zalloc_large(size_t size)
63 {
64 return vzalloc(size);
65 }
kmem_free_large(void * ptr)66 static inline void kmem_free_large(void *ptr)
67 {
68 vfree(ptr);
69 }
70
71 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
72
73 /*
74 * Zone interfaces
75 */
76
77 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
78 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
79 #define KM_ZONE_SPREAD SLAB_MEM_SPREAD
80
81 #define kmem_zone kmem_cache
82 #define kmem_zone_t struct kmem_cache
83
84 static inline kmem_zone_t *
kmem_zone_init(int size,char * zone_name)85 kmem_zone_init(int size, char *zone_name)
86 {
87 return kmem_cache_create(zone_name, size, 0, 0, NULL);
88 }
89
90 static inline kmem_zone_t *
kmem_zone_init_flags(int size,char * zone_name,unsigned long flags,void (* construct)(void *))91 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
92 void (*construct)(void *))
93 {
94 return kmem_cache_create(zone_name, size, 0, flags, construct);
95 }
96
97 static inline void
kmem_zone_free(kmem_zone_t * zone,void * ptr)98 kmem_zone_free(kmem_zone_t *zone, void *ptr)
99 {
100 kmem_cache_free(zone, ptr);
101 }
102
103 static inline void
kmem_zone_destroy(kmem_zone_t * zone)104 kmem_zone_destroy(kmem_zone_t *zone)
105 {
106 if (zone)
107 kmem_cache_destroy(zone);
108 }
109
110 extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
111 extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
112
113 #endif /* __XFS_SUPPORT_KMEM_H__ */
114