2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
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.
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.
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
18 #ifndef __XFS_SUPPORT_KMEM_H__
19 #define __XFS_SUPPORT_KMEM_H__
21 #include <linux/slab.h>
22 #include <linux/sched.h>
26 * Process flags handling
29 #define PFLAGS_TEST_NOIO() (current->flags & PF_NOIO)
30 #define PFLAGS_TEST_FSTRANS() (current->flags & PF_FSTRANS)
32 #define PFLAGS_SET_NOIO() do { \
33 current->flags |= PF_NOIO; \
36 #define PFLAGS_CLEAR_NOIO() do { \
37 current->flags &= ~PF_NOIO; \
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; \
46 #define PFLAGS_CLEAR_FSTRANS(STATEP) do { \
47 *(STATEP) = current->flags; \
48 current->flags &= ~PF_FSTRANS; \
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)); \
57 #define PFLAGS_DUP(OSTATEP, NSTATEP) do { \
58 *(NSTATEP) = *(OSTATEP); \
62 * General memory allocation interfaces
65 #define KM_SLEEP 0x0001u
66 #define KM_NOSLEEP 0x0002u
67 #define KM_NOFS 0x0004u
68 #define KM_MAYFAIL 0x0008u
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).
76 kmem_flags_convert(unsigned int __nocast flags)
80 BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL));
82 if (flags & KM_NOSLEEP) {
83 lflags = GFP_ATOMIC | __GFP_NOWARN;
85 lflags = GFP_KERNEL | __GFP_NOWARN;
86 if (PFLAGS_TEST_FSTRANS() || (flags & KM_NOFS))
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);
101 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
102 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
103 #define KM_ZONE_SPREAD SLAB_MEM_SPREAD
105 #define kmem_zone kmem_cache
106 #define kmem_zone_t struct kmem_cache
108 static inline kmem_zone_t *
109 kmem_zone_init(int size, char *zone_name)
111 return kmem_cache_create(zone_name, size, 0, 0, NULL, NULL);
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))
118 return kmem_cache_create(zone_name, size, 0, flags, construct, NULL);
122 kmem_zone_free(kmem_zone_t *zone, void *ptr)
124 kmem_cache_free(zone, ptr);
128 kmem_zone_destroy(kmem_zone_t *zone)
130 if (zone && kmem_cache_destroy(zone))
134 extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
135 extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
138 * Low memory cache shrinkers
141 typedef struct shrinker *kmem_shaker_t;
142 typedef int (*kmem_shake_func_t)(int, gfp_t);
144 static inline kmem_shaker_t
145 kmem_shake_register(kmem_shake_func_t sfunc)
147 return set_shrinker(DEFAULT_SEEKS, sfunc);
151 kmem_shake_deregister(kmem_shaker_t shrinker)
153 remove_shrinker(shrinker);
157 kmem_shake_allow(gfp_t gfp_mask)
159 return (gfp_mask & __GFP_WAIT);
162 #endif /* __XFS_SUPPORT_KMEM_H__ */