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 typedef unsigned __bitwise xfs_km_flags_t;
31 #define KM_SLEEP ((__force xfs_km_flags_t)0x0001u)
32 #define KM_NOSLEEP ((__force xfs_km_flags_t)0x0002u)
33 #define KM_NOFS ((__force xfs_km_flags_t)0x0004u)
34 #define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u)
35 #define KM_ZERO ((__force xfs_km_flags_t)0x0010u)
36
37 /*
38 * We use a special process flag to avoid recursive callbacks into
39 * the filesystem during transactions. We will also issue our own
40 * warnings, so we explicitly skip any generic ones (silly of us).
41 */
42 static inline gfp_t
kmem_flags_convert(xfs_km_flags_t flags)43 kmem_flags_convert(xfs_km_flags_t flags)
44 {
45 gfp_t lflags;
46
47 BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_ZERO));
48
49 if (flags & KM_NOSLEEP) {
50 lflags = GFP_ATOMIC | __GFP_NOWARN;
51 } else {
52 lflags = GFP_KERNEL | __GFP_NOWARN;
53 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
54 lflags &= ~__GFP_FS;
55 }
56
57 if (flags & KM_ZERO)
58 lflags |= __GFP_ZERO;
59
60 return lflags;
61 }
62
63 extern void *kmem_alloc(size_t, xfs_km_flags_t);
64 extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
65 extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t);
kmem_free(const void * ptr)66 static inline void kmem_free(const void *ptr)
67 {
68 kvfree(ptr);
69 }
70
71
72 static inline void *
kmem_zalloc(size_t size,xfs_km_flags_t flags)73 kmem_zalloc(size_t size, xfs_km_flags_t flags)
74 {
75 return kmem_alloc(size, flags | KM_ZERO);
76 }
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 *, xfs_km_flags_t);
116
117 static inline void *
kmem_zone_zalloc(kmem_zone_t * zone,xfs_km_flags_t flags)118 kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
119 {
120 return kmem_zone_alloc(zone, flags | KM_ZERO);
121 }
122
123 #endif /* __XFS_SUPPORT_KMEM_H__ */
124