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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
25/*
26 * General memory allocation interfaces
27 */
28
29#define KM_SLEEP 0x0001u
30#define KM_NOSLEEP 0x0002u
31#define KM_NOFS 0x0004u
32#define KM_MAYFAIL 0x0008u
33#define KM_LARGE 0x0010u
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 */
40static inline gfp_t
41kmem_flags_convert(unsigned int __nocast flags)
42{
43 gfp_t lflags;
44
45 BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_LARGE));
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
57extern void *kmem_alloc(size_t, unsigned int __nocast);
58extern void *kmem_zalloc(size_t, unsigned int __nocast);
59extern void *kmem_zalloc_greedy(size_t *, size_t, size_t, unsigned int __nocast);
60extern void *kmem_realloc(void *, size_t, size_t, unsigned int __nocast);
61extern void kmem_free(void *, size_t);
62
63/*
64 * Zone interfaces
65 */
66
67#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
68#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
69#define KM_ZONE_SPREAD SLAB_MEM_SPREAD
70
71#define kmem_zone kmem_cache
72#define kmem_zone_t struct kmem_cache
73
74static inline kmem_zone_t *
75kmem_zone_init(int size, char *zone_name)
76{
77 return kmem_cache_create(zone_name, size, 0, 0, NULL);
78}
79
80static inline kmem_zone_t *
81kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
82 void (*construct)(void *, kmem_zone_t *, unsigned long))
83{
84 return kmem_cache_create(zone_name, size, 0, flags, construct);
85}
86
87static inline void
88kmem_zone_free(kmem_zone_t *zone, void *ptr)
89{
90 kmem_cache_free(zone, ptr);
91}
92
93static inline void
94kmem_zone_destroy(kmem_zone_t *zone)
95{
96 if (zone)
97 kmem_cache_destroy(zone);
98}
99
100extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
101extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
102
103static inline int
104kmem_shake_allow(gfp_t gfp_mask)
105{
106 return (gfp_mask & __GFP_WAIT);
107}
108
109#endif /* __XFS_SUPPORT_KMEM_H__ */