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 void *ptr;
65
66 ptr = vmalloc(size);
67 if (ptr)
68 memset(ptr, 0, size);
69 return ptr;
70 }
kmem_free_large(void * ptr)71 static inline void kmem_free_large(void *ptr)
72 {
73 vfree(ptr);
74 }
75
76 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
77
78 /*
79 * Zone interfaces
80 */
81
82 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
83 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
84 #define KM_ZONE_SPREAD SLAB_MEM_SPREAD
85
86 #define kmem_zone kmem_cache
87 #define kmem_zone_t struct kmem_cache
88
89 static inline kmem_zone_t *
kmem_zone_init(int size,char * zone_name)90 kmem_zone_init(int size, char *zone_name)
91 {
92 return kmem_cache_create(zone_name, size, 0, 0, NULL);
93 }
94
95 static inline kmem_zone_t *
kmem_zone_init_flags(int size,char * zone_name,unsigned long flags,void (* construct)(void *))96 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
97 void (*construct)(void *))
98 {
99 return kmem_cache_create(zone_name, size, 0, flags, construct);
100 }
101
102 static inline void
kmem_zone_free(kmem_zone_t * zone,void * ptr)103 kmem_zone_free(kmem_zone_t *zone, void *ptr)
104 {
105 kmem_cache_free(zone, ptr);
106 }
107
108 static inline void
kmem_zone_destroy(kmem_zone_t * zone)109 kmem_zone_destroy(kmem_zone_t *zone)
110 {
111 if (zone)
112 kmem_cache_destroy(zone);
113 }
114
115 extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
116 extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
117
118 static inline int
kmem_shake_allow(gfp_t gfp_mask)119 kmem_shake_allow(gfp_t gfp_mask)
120 {
121 return ((gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS));
122 }
123
124 #endif /* __XFS_SUPPORT_KMEM_H__ */
125