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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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 | * |
7b718769 NS |
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 | |
1da177e4 LT |
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 | ||
8758280f NS |
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 | ||
34 | /* | |
35 | * We use a special process flag to avoid recursive callbacks into | |
36 | * the filesystem during transactions. We will also issue our own | |
37 | * warnings, so we explicitly skip any generic ones (silly of us). | |
38 | */ | |
39 | static inline gfp_t | |
40 | kmem_flags_convert(unsigned int __nocast flags) | |
1da177e4 | 41 | { |
8758280f | 42 | gfp_t lflags; |
1da177e4 | 43 | |
8758280f | 44 | BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL)); |
1da177e4 LT |
45 | |
46 | if (flags & KM_NOSLEEP) { | |
8758280f | 47 | lflags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 48 | } else { |
8758280f | 49 | lflags = GFP_KERNEL | __GFP_NOWARN; |
59c1b082 | 50 | if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) |
1da177e4 LT |
51 | lflags &= ~__GFP_FS; |
52 | } | |
8758280f | 53 | return lflags; |
1da177e4 LT |
54 | } |
55 | ||
8758280f NS |
56 | extern void *kmem_alloc(size_t, unsigned int __nocast); |
57 | extern void *kmem_realloc(void *, size_t, size_t, unsigned int __nocast); | |
58 | extern void *kmem_zalloc(size_t, unsigned int __nocast); | |
59 | extern void kmem_free(void *, size_t); | |
60 | ||
61 | /* | |
62 | * Zone interfaces | |
63 | */ | |
64 | ||
65 | #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN | |
66 | #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT | |
b0196009 | 67 | #define KM_ZONE_SPREAD SLAB_MEM_SPREAD |
8758280f NS |
68 | |
69 | #define kmem_zone kmem_cache | |
70 | #define kmem_zone_t struct kmem_cache | |
71 | ||
72 | static inline kmem_zone_t * | |
1da177e4 LT |
73 | kmem_zone_init(int size, char *zone_name) |
74 | { | |
75 | return kmem_cache_create(zone_name, size, 0, 0, NULL, NULL); | |
76 | } | |
77 | ||
8758280f NS |
78 | static inline kmem_zone_t * |
79 | kmem_zone_init_flags(int size, char *zone_name, unsigned long flags, | |
80 | void (*construct)(void *, kmem_zone_t *, unsigned long)) | |
81 | { | |
82 | return kmem_cache_create(zone_name, size, 0, flags, construct, NULL); | |
83 | } | |
84 | ||
85 | static inline void | |
1da177e4 LT |
86 | kmem_zone_free(kmem_zone_t *zone, void *ptr) |
87 | { | |
88 | kmem_cache_free(zone, ptr); | |
89 | } | |
90 | ||
8758280f | 91 | static inline void |
1da177e4 LT |
92 | kmem_zone_destroy(kmem_zone_t *zone) |
93 | { | |
1a1d92c1 AD |
94 | if (zone) |
95 | kmem_cache_destroy(zone); | |
1da177e4 LT |
96 | } |
97 | ||
7f248a81 | 98 | extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast); |
8758280f | 99 | extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast); |
1da177e4 | 100 | |
8758280f NS |
101 | /* |
102 | * Low memory cache shrinkers | |
103 | */ | |
1da177e4 LT |
104 | |
105 | typedef struct shrinker *kmem_shaker_t; | |
27496a8c | 106 | typedef int (*kmem_shake_func_t)(int, gfp_t); |
1da177e4 | 107 | |
8758280f | 108 | static inline kmem_shaker_t |
1da177e4 LT |
109 | kmem_shake_register(kmem_shake_func_t sfunc) |
110 | { | |
111 | return set_shrinker(DEFAULT_SEEKS, sfunc); | |
112 | } | |
113 | ||
8758280f | 114 | static inline void |
1da177e4 LT |
115 | kmem_shake_deregister(kmem_shaker_t shrinker) |
116 | { | |
117 | remove_shrinker(shrinker); | |
118 | } | |
119 | ||
8758280f | 120 | static inline int |
27496a8c | 121 | kmem_shake_allow(gfp_t gfp_mask) |
1da177e4 LT |
122 | { |
123 | return (gfp_mask & __GFP_WAIT); | |
124 | } | |
125 | ||
126 | #endif /* __XFS_SUPPORT_KMEM_H__ */ |