1 /*
2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
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.
8  *
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.
13  *
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
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 #include <linux/vmalloc.h>
25 
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
kmem_flags_convert(unsigned int __nocast flags)41 kmem_flags_convert(unsigned int __nocast flags)
42 {
43 	gfp_t	lflags;
44 
45 	BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL));
46 
47 	if (flags & KM_NOSLEEP) {
48 		lflags = GFP_ATOMIC | __GFP_NOWARN;
49 	} else {
50 		lflags = GFP_KERNEL | __GFP_NOWARN;
51 		if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
52 			lflags &= ~__GFP_FS;
53 	}
54 	return lflags;
55 }
56 
57 extern void *kmem_alloc(size_t, unsigned int __nocast);
58 extern void *kmem_zalloc(size_t, unsigned int __nocast);
59 extern void *kmem_realloc(const void *, size_t, size_t, unsigned int __nocast);
60 extern void  kmem_free(const void *);
61 
kmem_zalloc_large(size_t size)62 static inline void *kmem_zalloc_large(size_t size)
63 {
64 	return vzalloc(size);
65 }
kmem_free_large(void * ptr)66 static inline void kmem_free_large(void *ptr)
67 {
68 	vfree(ptr);
69 }
70 
71 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
72 
73 /*
74  * Zone interfaces
75  */
76 
77 #define KM_ZONE_HWALIGN	SLAB_HWCACHE_ALIGN
78 #define KM_ZONE_RECLAIM	SLAB_RECLAIM_ACCOUNT
79 #define KM_ZONE_SPREAD	SLAB_MEM_SPREAD
80 
81 #define kmem_zone	kmem_cache
82 #define kmem_zone_t	struct kmem_cache
83 
84 static inline kmem_zone_t *
kmem_zone_init(int size,char * zone_name)85 kmem_zone_init(int size, char *zone_name)
86 {
87 	return kmem_cache_create(zone_name, size, 0, 0, NULL);
88 }
89 
90 static inline kmem_zone_t *
kmem_zone_init_flags(int size,char * zone_name,unsigned long flags,void (* construct)(void *))91 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
92 		     void (*construct)(void *))
93 {
94 	return kmem_cache_create(zone_name, size, 0, flags, construct);
95 }
96 
97 static inline void
kmem_zone_free(kmem_zone_t * zone,void * ptr)98 kmem_zone_free(kmem_zone_t *zone, void *ptr)
99 {
100 	kmem_cache_free(zone, ptr);
101 }
102 
103 static inline void
kmem_zone_destroy(kmem_zone_t * zone)104 kmem_zone_destroy(kmem_zone_t *zone)
105 {
106 	if (zone)
107 		kmem_cache_destroy(zone);
108 }
109 
110 extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
111 extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
112 
113 #endif /* __XFS_SUPPORT_KMEM_H__ */
114