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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
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)
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 */
42static inline gfp_t
43kmem_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 (flags & KM_NOFS)
54 lflags &= ~__GFP_FS;
55 }
56
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
67 if (flags & KM_ZERO)
68 lflags |= __GFP_ZERO;
69
70 return lflags;
71}
72
73extern void *kmem_alloc(size_t, xfs_km_flags_t);
74extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
75extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
76static inline void kmem_free(const void *ptr)
77{
78 kvfree(ptr);
79}
80
81
82static inline void *
83kmem_zalloc(size_t size, xfs_km_flags_t flags)
84{
85 return kmem_alloc(size, flags | KM_ZERO);
86}
87
88/*
89 * Zone interfaces
90 */
91
92#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
93#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
94#define KM_ZONE_SPREAD SLAB_MEM_SPREAD
95#define KM_ZONE_ACCOUNT SLAB_ACCOUNT
96
97#define kmem_zone kmem_cache
98#define kmem_zone_t struct kmem_cache
99
100static inline kmem_zone_t *
101kmem_zone_init(int size, char *zone_name)
102{
103 return kmem_cache_create(zone_name, size, 0, 0, NULL);
104}
105
106static inline kmem_zone_t *
107kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
108 void (*construct)(void *))
109{
110 return kmem_cache_create(zone_name, size, 0, flags, construct);
111}
112
113static inline void
114kmem_zone_free(kmem_zone_t *zone, void *ptr)
115{
116 kmem_cache_free(zone, ptr);
117}
118
119static inline void
120kmem_zone_destroy(kmem_zone_t *zone)
121{
122 if (zone)
123 kmem_cache_destroy(zone);
124}
125
126extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
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}
133
134#endif /* __XFS_SUPPORT_KMEM_H__ */