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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 | |
efb8ad7e | 33 | #define KM_LARGE 0x0010u |
8758280f NS |
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) | |
1da177e4 | 42 | { |
8758280f | 43 | gfp_t lflags; |
1da177e4 | 44 | |
efb8ad7e | 45 | BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_LARGE)); |
1da177e4 LT |
46 | |
47 | if (flags & KM_NOSLEEP) { | |
8758280f | 48 | lflags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 49 | } else { |
8758280f | 50 | lflags = GFP_KERNEL | __GFP_NOWARN; |
59c1b082 | 51 | if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) |
1da177e4 LT |
52 | lflags &= ~__GFP_FS; |
53 | } | |
8758280f | 54 | return lflags; |
1da177e4 LT |
55 | } |
56 | ||
8758280f NS |
57 | extern void *kmem_alloc(size_t, unsigned int __nocast); |
58 | extern void *kmem_realloc(void *, size_t, size_t, unsigned int __nocast); | |
59 | extern void *kmem_zalloc(size_t, unsigned int __nocast); | |
60 | extern void kmem_free(void *, size_t); | |
61 | ||
62 | /* | |
63 | * Zone interfaces | |
64 | */ | |
65 | ||
66 | #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN | |
67 | #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT | |
b0196009 | 68 | #define KM_ZONE_SPREAD SLAB_MEM_SPREAD |
8758280f NS |
69 | |
70 | #define kmem_zone kmem_cache | |
71 | #define kmem_zone_t struct kmem_cache | |
72 | ||
73 | static inline kmem_zone_t * | |
1da177e4 LT |
74 | kmem_zone_init(int size, char *zone_name) |
75 | { | |
76 | return kmem_cache_create(zone_name, size, 0, 0, NULL, NULL); | |
77 | } | |
78 | ||
8758280f NS |
79 | static inline kmem_zone_t * |
80 | kmem_zone_init_flags(int size, char *zone_name, unsigned long flags, | |
81 | void (*construct)(void *, kmem_zone_t *, unsigned long)) | |
82 | { | |
83 | return kmem_cache_create(zone_name, size, 0, flags, construct, NULL); | |
84 | } | |
85 | ||
86 | static inline void | |
1da177e4 LT |
87 | kmem_zone_free(kmem_zone_t *zone, void *ptr) |
88 | { | |
89 | kmem_cache_free(zone, ptr); | |
90 | } | |
91 | ||
8758280f | 92 | static inline void |
1da177e4 LT |
93 | kmem_zone_destroy(kmem_zone_t *zone) |
94 | { | |
1a1d92c1 AD |
95 | if (zone) |
96 | kmem_cache_destroy(zone); | |
1da177e4 LT |
97 | } |
98 | ||
7f248a81 | 99 | extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast); |
8758280f | 100 | extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast); |
1da177e4 | 101 | |
8758280f NS |
102 | /* |
103 | * Low memory cache shrinkers | |
104 | */ | |
1da177e4 LT |
105 | |
106 | typedef struct shrinker *kmem_shaker_t; | |
27496a8c | 107 | typedef int (*kmem_shake_func_t)(int, gfp_t); |
1da177e4 | 108 | |
8758280f | 109 | static inline kmem_shaker_t |
1da177e4 LT |
110 | kmem_shake_register(kmem_shake_func_t sfunc) |
111 | { | |
112 | return set_shrinker(DEFAULT_SEEKS, sfunc); | |
113 | } | |
114 | ||
8758280f | 115 | static inline void |
1da177e4 LT |
116 | kmem_shake_deregister(kmem_shaker_t shrinker) |
117 | { | |
118 | remove_shrinker(shrinker); | |
119 | } | |
120 | ||
8758280f | 121 | static inline int |
27496a8c | 122 | kmem_shake_allow(gfp_t gfp_mask) |
1da177e4 LT |
123 | { |
124 | return (gfp_mask & __GFP_WAIT); | |
125 | } | |
126 | ||
127 | #endif /* __XFS_SUPPORT_KMEM_H__ */ |