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 */
40 static inline gfp_t
41 kmem_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
57 extern void *kmem_alloc(size_t, unsigned int __nocast);
58 extern void *kmem_zalloc(size_t, unsigned int __nocast);
59 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t, unsigned int __nocast);
60 extern void *kmem_realloc(const void *, size_t, size_t, unsigned int __nocast);
61 extern void kmem_free(const void *);
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
74 static inline kmem_zone_t *
75 kmem_zone_init(int size, char *zone_name)
76 {
77 return kmem_cache_create(zone_name, size, 0, 0, NULL);
78 }
79
80 static inline kmem_zone_t *
81 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
82 void (*construct)(void *))
83 {
84 return kmem_cache_create(zone_name, size, 0, flags, construct);
85 }
86
87 static inline void
88 kmem_zone_free(kmem_zone_t *zone, void *ptr)
89 {
90 kmem_cache_free(zone, ptr);
91 }
92
93 static inline void
94 kmem_zone_destroy(kmem_zone_t *zone)
95 {
96 if (zone)
97 kmem_cache_destroy(zone);
98 }
99
100 extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
101 extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
102
103 static inline int
104 kmem_shake_allow(gfp_t gfp_mask)
105 {
106 return ((gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS));
107 }
108
109 #endif /* __XFS_SUPPORT_KMEM_H__ */
110
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