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 ((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
63extern void *kmem_alloc(size_t, xfs_km_flags_t);
64extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
65extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t);
66static inline void  kmem_free(const void *ptr)
67{
68	kvfree(ptr);
69}
70
71
72extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
73
74static inline void *
75kmem_zalloc(size_t size, xfs_km_flags_t flags)
76{
77	return kmem_alloc(size, flags | KM_ZERO);
78}
79
80/*
81 * Zone interfaces
82 */
83
84#define KM_ZONE_HWALIGN	SLAB_HWCACHE_ALIGN
85#define KM_ZONE_RECLAIM	SLAB_RECLAIM_ACCOUNT
86#define KM_ZONE_SPREAD	SLAB_MEM_SPREAD
87
88#define kmem_zone	kmem_cache
89#define kmem_zone_t	struct kmem_cache
90
91static inline kmem_zone_t *
92kmem_zone_init(int size, char *zone_name)
93{
94	return kmem_cache_create(zone_name, size, 0, 0, NULL);
95}
96
97static inline kmem_zone_t *
98kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
99		     void (*construct)(void *))
100{
101	return kmem_cache_create(zone_name, size, 0, flags, construct);
102}
103
104static inline void
105kmem_zone_free(kmem_zone_t *zone, void *ptr)
106{
107	kmem_cache_free(zone, ptr);
108}
109
110static inline void
111kmem_zone_destroy(kmem_zone_t *zone)
112{
113	if (zone)
114		kmem_cache_destroy(zone);
115}
116
117extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
118
119static inline void *
120kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
121{
122	return kmem_zone_alloc(zone, flags | KM_ZERO);
123}
124
125#endif /* __XFS_SUPPORT_KMEM_H__ */
126