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1da177e4 1/*
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2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
1da177e4 4 *
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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
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7 * published by the Free Software Foundation.
8 *
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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.
1da177e4 13 *
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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
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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>
bdfb0430 24#include <linux/vmalloc.h>
1da177e4 25
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26/*
27 * General memory allocation interfaces
28 */
29
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30typedef 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)
359d992b 35#define KM_ZERO ((__force xfs_km_flags_t)0x0010u)
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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 */
42static inline gfp_t
77ba7877 43kmem_flags_convert(xfs_km_flags_t flags)
1da177e4 44{
8758280f 45 gfp_t lflags;
1da177e4 46
359d992b 47 BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_ZERO));
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48
49 if (flags & KM_NOSLEEP) {
8758280f 50 lflags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 51 } else {
8758280f 52 lflags = GFP_KERNEL | __GFP_NOWARN;
7dea19f9 53 if (flags & KM_NOFS)
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54 lflags &= ~__GFP_FS;
55 }
359d992b 56
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57 /*
58 * Default page/slab allocator behavior is to retry for ever
59 * for small allocations. We can override this behavior by using
60 * __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long
61 * as it is feasible but rather fail than retry forever for all
62 * request sizes.
63 */
64 if (flags & KM_MAYFAIL)
65 lflags |= __GFP_RETRY_MAYFAIL;
66
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67 if (flags & KM_ZERO)
68 lflags |= __GFP_ZERO;
69
8758280f 70 return lflags;
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71}
72
77ba7877 73extern void *kmem_alloc(size_t, xfs_km_flags_t);
fdd3ccee 74extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
664b60f6 75extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
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76static inline void kmem_free(const void *ptr)
77{
78 kvfree(ptr);
79}
8758280f 80
bdfb0430 81
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82static inline void *
83kmem_zalloc(size_t size, xfs_km_flags_t flags)
84{
85 return kmem_alloc(size, flags | KM_ZERO);
86}
87
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88/*
89 * Zone interfaces
90 */
91
92#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
93#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
b0196009 94#define KM_ZONE_SPREAD SLAB_MEM_SPREAD
5d097056 95#define KM_ZONE_ACCOUNT SLAB_ACCOUNT
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96
97#define kmem_zone kmem_cache
98#define kmem_zone_t struct kmem_cache
99
100static inline kmem_zone_t *
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101kmem_zone_init(int size, char *zone_name)
102{
20c2df83 103 return kmem_cache_create(zone_name, size, 0, 0, NULL);
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104}
105
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106static inline kmem_zone_t *
107kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
51cc5068 108 void (*construct)(void *))
8758280f 109{
20c2df83 110 return kmem_cache_create(zone_name, size, 0, flags, construct);
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111}
112
113static inline void
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114kmem_zone_free(kmem_zone_t *zone, void *ptr)
115{
116 kmem_cache_free(zone, ptr);
117}
118
8758280f 119static inline void
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120kmem_zone_destroy(kmem_zone_t *zone)
121{
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122 if (zone)
123 kmem_cache_destroy(zone);
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124}
125
77ba7877 126extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
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127
128static inline void *
129kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
130{
131 return kmem_zone_alloc(zone, flags | KM_ZERO);
132}
1da177e4 133
1da177e4 134#endif /* __XFS_SUPPORT_KMEM_H__ */