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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 typedef unsigned __bitwise xfs_km_flags_t;
31 #define KM_SLEEP	((__force xfs_km_flags_t)0x0001u)
32 #define KM_NOSLEEP	((__force xfs_km_flags_t)0x0002u)
33 #define KM_NOFS		((__force xfs_km_flags_t)0x0004u)
34 #define KM_MAYFAIL	((__force xfs_km_flags_t)0x0008u)
35 #define KM_ZERO		((__force xfs_km_flags_t)0x0010u)
36 
37 /*
38  * We use a special process flag to avoid recursive callbacks into
39  * the filesystem during transactions.  We will also issue our own
40  * warnings, so we explicitly skip any generic ones (silly of us).
41  */
42 static inline gfp_t
kmem_flags_convert(xfs_km_flags_t flags)43 kmem_flags_convert(xfs_km_flags_t flags)
44 {
45 	gfp_t	lflags;
46 
47 	BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_ZERO));
48 
49 	if (flags & KM_NOSLEEP) {
50 		lflags = GFP_ATOMIC | __GFP_NOWARN;
51 	} else {
52 		lflags = GFP_KERNEL | __GFP_NOWARN;
53 		if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
54 			lflags &= ~__GFP_FS;
55 	}
56 
57 	if (flags & KM_ZERO)
58 		lflags |= __GFP_ZERO;
59 
60 	return lflags;
61 }
62 
63 extern void *kmem_alloc(size_t, xfs_km_flags_t);
64 extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
65 extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
kmem_free(const void * ptr)66 static inline void  kmem_free(const void *ptr)
67 {
68 	kvfree(ptr);
69 }
70 
71 
72 static inline void *
kmem_zalloc(size_t size,xfs_km_flags_t flags)73 kmem_zalloc(size_t size, xfs_km_flags_t flags)
74 {
75 	return kmem_alloc(size, flags | KM_ZERO);
76 }
77 
78 /*
79  * Zone interfaces
80  */
81 
82 #define KM_ZONE_HWALIGN	SLAB_HWCACHE_ALIGN
83 #define KM_ZONE_RECLAIM	SLAB_RECLAIM_ACCOUNT
84 #define KM_ZONE_SPREAD	SLAB_MEM_SPREAD
85 #define KM_ZONE_ACCOUNT	SLAB_ACCOUNT
86 
87 #define kmem_zone	kmem_cache
88 #define kmem_zone_t	struct kmem_cache
89 
90 static inline kmem_zone_t *
kmem_zone_init(int size,char * zone_name)91 kmem_zone_init(int size, char *zone_name)
92 {
93 	return kmem_cache_create(zone_name, size, 0, 0, NULL);
94 }
95 
96 static inline kmem_zone_t *
kmem_zone_init_flags(int size,char * zone_name,unsigned long flags,void (* construct)(void *))97 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
98 		     void (*construct)(void *))
99 {
100 	return kmem_cache_create(zone_name, size, 0, flags, construct);
101 }
102 
103 static inline void
kmem_zone_free(kmem_zone_t * zone,void * ptr)104 kmem_zone_free(kmem_zone_t *zone, void *ptr)
105 {
106 	kmem_cache_free(zone, ptr);
107 }
108 
109 static inline void
kmem_zone_destroy(kmem_zone_t * zone)110 kmem_zone_destroy(kmem_zone_t *zone)
111 {
112 	if (zone)
113 		kmem_cache_destroy(zone);
114 }
115 
116 extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
117 
118 static inline void *
kmem_zone_zalloc(kmem_zone_t * zone,xfs_km_flags_t flags)119 kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
120 {
121 	return kmem_zone_alloc(zone, flags | KM_ZERO);
122 }
123 
124 #endif /* __XFS_SUPPORT_KMEM_H__ */
125