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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> | |
bdfb0430 | 24 | #include <linux/vmalloc.h> |
1da177e4 | 25 | |
8758280f NS |
26 | /* |
27 | * General memory allocation interfaces | |
28 | */ | |
29 | ||
30 | #define KM_SLEEP 0x0001u | |
31 | #define KM_NOSLEEP 0x0002u | |
32 | #define KM_NOFS 0x0004u | |
33 | #define KM_MAYFAIL 0x0008u | |
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 | |
bdfb0430 | 45 | BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL)); |
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 | 57 | extern void *kmem_alloc(size_t, unsigned int __nocast); |
8758280f | 58 | extern void *kmem_zalloc(size_t, unsigned int __nocast); |
d3689d76 BN |
59 | extern void *kmem_realloc(const void *, size_t, size_t, unsigned int __nocast); |
60 | extern void kmem_free(const void *); | |
8758280f | 61 | |
bdfb0430 CH |
62 | static inline void *kmem_zalloc_large(size_t size) |
63 | { | |
64 | void *ptr; | |
65 | ||
66 | ptr = vmalloc(size); | |
67 | if (ptr) | |
68 | memset(ptr, 0, size); | |
69 | return ptr; | |
70 | } | |
71 | static inline void kmem_free_large(void *ptr) | |
72 | { | |
73 | vfree(ptr); | |
74 | } | |
75 | ||
76 | extern void *kmem_zalloc_greedy(size_t *, size_t, size_t); | |
77 | ||
8758280f NS |
78 | /* |
79 | * Zone interfaces | |
80 | */ | |
81 | ||
82 | #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN | |
83 | #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT | |
b0196009 | 84 | #define KM_ZONE_SPREAD SLAB_MEM_SPREAD |
8758280f NS |
85 | |
86 | #define kmem_zone kmem_cache | |
87 | #define kmem_zone_t struct kmem_cache | |
88 | ||
89 | static inline kmem_zone_t * | |
1da177e4 LT |
90 | kmem_zone_init(int size, char *zone_name) |
91 | { | |
20c2df83 | 92 | return kmem_cache_create(zone_name, size, 0, 0, NULL); |
1da177e4 LT |
93 | } |
94 | ||
8758280f NS |
95 | static inline kmem_zone_t * |
96 | kmem_zone_init_flags(int size, char *zone_name, unsigned long flags, | |
51cc5068 | 97 | void (*construct)(void *)) |
8758280f | 98 | { |
20c2df83 | 99 | return kmem_cache_create(zone_name, size, 0, flags, construct); |
8758280f NS |
100 | } |
101 | ||
102 | static inline void | |
1da177e4 LT |
103 | kmem_zone_free(kmem_zone_t *zone, void *ptr) |
104 | { | |
105 | kmem_cache_free(zone, ptr); | |
106 | } | |
107 | ||
8758280f | 108 | static inline void |
1da177e4 LT |
109 | kmem_zone_destroy(kmem_zone_t *zone) |
110 | { | |
1a1d92c1 AD |
111 | if (zone) |
112 | kmem_cache_destroy(zone); | |
1da177e4 LT |
113 | } |
114 | ||
7f248a81 | 115 | extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast); |
8758280f | 116 | extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast); |
1da177e4 | 117 | |
8758280f | 118 | static inline int |
27496a8c | 119 | kmem_shake_allow(gfp_t gfp_mask) |
1da177e4 | 120 | { |
1b17d766 | 121 | return ((gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS)); |
1da177e4 LT |
122 | } |
123 | ||
124 | #endif /* __XFS_SUPPORT_KMEM_H__ */ |