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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 | ||
25 | /* | |
8758280f | 26 | * Process flags handling |
1da177e4 | 27 | */ |
1da177e4 LT |
28 | |
29 | #define PFLAGS_TEST_NOIO() (current->flags & PF_NOIO) | |
30 | #define PFLAGS_TEST_FSTRANS() (current->flags & PF_FSTRANS) | |
31 | ||
32 | #define PFLAGS_SET_NOIO() do { \ | |
33 | current->flags |= PF_NOIO; \ | |
34 | } while (0) | |
35 | ||
36 | #define PFLAGS_CLEAR_NOIO() do { \ | |
37 | current->flags &= ~PF_NOIO; \ | |
38 | } while (0) | |
39 | ||
40 | /* these could be nested, so we save state */ | |
41 | #define PFLAGS_SET_FSTRANS(STATEP) do { \ | |
42 | *(STATEP) = current->flags; \ | |
43 | current->flags |= PF_FSTRANS; \ | |
44 | } while (0) | |
45 | ||
46 | #define PFLAGS_CLEAR_FSTRANS(STATEP) do { \ | |
47 | *(STATEP) = current->flags; \ | |
48 | current->flags &= ~PF_FSTRANS; \ | |
49 | } while (0) | |
50 | ||
51 | /* Restore the PF_FSTRANS state to what was saved in STATEP */ | |
52 | #define PFLAGS_RESTORE_FSTRANS(STATEP) do { \ | |
53 | current->flags = ((current->flags & ~PF_FSTRANS) | \ | |
54 | (*(STATEP) & PF_FSTRANS)); \ | |
55 | } while (0) | |
56 | ||
57 | #define PFLAGS_DUP(OSTATEP, NSTATEP) do { \ | |
58 | *(NSTATEP) = *(OSTATEP); \ | |
59 | } while (0) | |
60 | ||
8758280f NS |
61 | /* |
62 | * General memory allocation interfaces | |
63 | */ | |
64 | ||
65 | #define KM_SLEEP 0x0001u | |
66 | #define KM_NOSLEEP 0x0002u | |
67 | #define KM_NOFS 0x0004u | |
68 | #define KM_MAYFAIL 0x0008u | |
69 | ||
70 | /* | |
71 | * We use a special process flag to avoid recursive callbacks into | |
72 | * the filesystem during transactions. We will also issue our own | |
73 | * warnings, so we explicitly skip any generic ones (silly of us). | |
74 | */ | |
75 | static inline gfp_t | |
76 | kmem_flags_convert(unsigned int __nocast flags) | |
1da177e4 | 77 | { |
8758280f | 78 | gfp_t lflags; |
1da177e4 | 79 | |
8758280f | 80 | BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL)); |
1da177e4 LT |
81 | |
82 | if (flags & KM_NOSLEEP) { | |
8758280f | 83 | lflags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 84 | } else { |
8758280f | 85 | lflags = GFP_KERNEL | __GFP_NOWARN; |
1da177e4 LT |
86 | if (PFLAGS_TEST_FSTRANS() || (flags & KM_NOFS)) |
87 | lflags &= ~__GFP_FS; | |
88 | } | |
8758280f | 89 | return lflags; |
1da177e4 LT |
90 | } |
91 | ||
8758280f NS |
92 | extern void *kmem_alloc(size_t, unsigned int __nocast); |
93 | extern void *kmem_realloc(void *, size_t, size_t, unsigned int __nocast); | |
94 | extern void *kmem_zalloc(size_t, unsigned int __nocast); | |
95 | extern void kmem_free(void *, size_t); | |
96 | ||
97 | /* | |
98 | * Zone interfaces | |
99 | */ | |
100 | ||
101 | #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN | |
102 | #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT | |
103 | #define KM_ZONE_SPREAD 0 | |
104 | ||
105 | #define kmem_zone kmem_cache | |
106 | #define kmem_zone_t struct kmem_cache | |
107 | ||
108 | static inline kmem_zone_t * | |
1da177e4 LT |
109 | kmem_zone_init(int size, char *zone_name) |
110 | { | |
111 | return kmem_cache_create(zone_name, size, 0, 0, NULL, NULL); | |
112 | } | |
113 | ||
8758280f NS |
114 | static inline kmem_zone_t * |
115 | kmem_zone_init_flags(int size, char *zone_name, unsigned long flags, | |
116 | void (*construct)(void *, kmem_zone_t *, unsigned long)) | |
117 | { | |
118 | return kmem_cache_create(zone_name, size, 0, flags, construct, NULL); | |
119 | } | |
120 | ||
121 | static inline void | |
1da177e4 LT |
122 | kmem_zone_free(kmem_zone_t *zone, void *ptr) |
123 | { | |
124 | kmem_cache_free(zone, ptr); | |
125 | } | |
126 | ||
8758280f | 127 | static inline void |
1da177e4 LT |
128 | kmem_zone_destroy(kmem_zone_t *zone) |
129 | { | |
130 | if (zone && kmem_cache_destroy(zone)) | |
131 | BUG(); | |
132 | } | |
133 | ||
7f248a81 | 134 | extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast); |
8758280f | 135 | extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast); |
1da177e4 | 136 | |
8758280f NS |
137 | /* |
138 | * Low memory cache shrinkers | |
139 | */ | |
1da177e4 LT |
140 | |
141 | typedef struct shrinker *kmem_shaker_t; | |
27496a8c | 142 | typedef int (*kmem_shake_func_t)(int, gfp_t); |
1da177e4 | 143 | |
8758280f | 144 | static inline kmem_shaker_t |
1da177e4 LT |
145 | kmem_shake_register(kmem_shake_func_t sfunc) |
146 | { | |
147 | return set_shrinker(DEFAULT_SEEKS, sfunc); | |
148 | } | |
149 | ||
8758280f | 150 | static inline void |
1da177e4 LT |
151 | kmem_shake_deregister(kmem_shaker_t shrinker) |
152 | { | |
153 | remove_shrinker(shrinker); | |
154 | } | |
155 | ||
8758280f | 156 | static inline int |
27496a8c | 157 | kmem_shake_allow(gfp_t gfp_mask) |
1da177e4 LT |
158 | { |
159 | return (gfp_mask & __GFP_WAIT); | |
160 | } | |
161 | ||
162 | #endif /* __XFS_SUPPORT_KMEM_H__ */ |