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 * General memory allocation interfaces
29 #define KM_SLEEP 0x0001u
30 #define KM_NOSLEEP 0x0002u
31 #define KM_NOFS 0x0004u
32 #define KM_MAYFAIL 0x0008u
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).
40 kmem_flags_convert(unsigned int __nocast flags
)
44 BUG_ON(flags
& ~(KM_SLEEP
|KM_NOSLEEP
|KM_NOFS
|KM_MAYFAIL
));
46 if (flags
& KM_NOSLEEP
) {
47 lflags
= GFP_ATOMIC
| __GFP_NOWARN
;
49 lflags
= GFP_KERNEL
| __GFP_NOWARN
;
50 if ((current
->flags
& PF_FSTRANS
) || (flags
& KM_NOFS
))
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);
65 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
66 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
67 #define KM_ZONE_SPREAD SLAB_MEM_SPREAD
69 #define kmem_zone kmem_cache
70 #define kmem_zone_t struct kmem_cache
72 static inline kmem_zone_t
*
73 kmem_zone_init(int size
, char *zone_name
)
75 return kmem_cache_create(zone_name
, size
, 0, 0, NULL
, NULL
);
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))
82 return kmem_cache_create(zone_name
, size
, 0, flags
, construct
, NULL
);
86 kmem_zone_free(kmem_zone_t
*zone
, void *ptr
)
88 kmem_cache_free(zone
, ptr
);
92 kmem_zone_destroy(kmem_zone_t
*zone
)
95 kmem_cache_destroy(zone
);
98 extern void *kmem_zone_alloc(kmem_zone_t
*, unsigned int __nocast
);
99 extern void *kmem_zone_zalloc(kmem_zone_t
*, unsigned int __nocast
);
102 * Low memory cache shrinkers
105 typedef struct shrinker
*kmem_shaker_t
;
106 typedef int (*kmem_shake_func_t
)(int, gfp_t
);
108 static inline kmem_shaker_t
109 kmem_shake_register(kmem_shake_func_t sfunc
)
111 return set_shrinker(DEFAULT_SEEKS
, sfunc
);
115 kmem_shake_deregister(kmem_shaker_t shrinker
)
117 remove_shrinker(shrinker
);
121 kmem_shake_allow(gfp_t gfp_mask
)
123 return (gfp_mask
& __GFP_WAIT
);
126 #endif /* __XFS_SUPPORT_KMEM_H__ */
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