1 /*
2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32 #ifndef __XFS_SUPPORT_KMEM_H__
33 #define __XFS_SUPPORT_KMEM_H__
34
35 #include <linux/slab.h>
36
37 /*
38 * memory management routines
39 */
40 #define KM_SLEEP 0x0001
41 #define KM_NOSLEEP 0x0002
42 #define KM_NOFS 0x0004
43 #define KM_MAYFAIL 0x0008
44
45 #define kmem_zone kmem_cache_s
46 #define kmem_zone_t kmem_cache_t
47
48 typedef unsigned long xfs_pflags_t;
49
50 #define PFLAGS_TEST_NOIO() (current->flags & PF_NOIO)
51 #define PFLAGS_TEST_FSTRANS() (current->flags & PF_FSTRANS)
52
53 #define PFLAGS_SET_NOIO() do { \
54 current->flags |= PF_NOIO; \
55 } while (0)
56
57 #define PFLAGS_CLEAR_NOIO() do { \
58 current->flags &= ~PF_NOIO; \
59 } while (0)
60
61 /* these could be nested, so we save state */
62 #define PFLAGS_SET_FSTRANS(STATEP) do { \
63 *(STATEP) = current->flags; \
64 current->flags |= PF_FSTRANS; \
65 } while (0)
66
67 #define PFLAGS_CLEAR_FSTRANS(STATEP) do { \
68 *(STATEP) = current->flags; \
69 current->flags &= ~PF_FSTRANS; \
70 } while (0)
71
72 /* Restore the PF_FSTRANS state to what was saved in STATEP */
73 #define PFLAGS_RESTORE_FSTRANS(STATEP) do { \
74 current->flags = ((current->flags & ~PF_FSTRANS) | \
75 (*(STATEP) & PF_FSTRANS)); \
76 } while (0)
77
78 #define PFLAGS_DUP(OSTATEP, NSTATEP) do { \
79 *(NSTATEP) = *(OSTATEP); \
80 } while (0)
81
kmem_flags_convert(int flags)82 static __inline unsigned int kmem_flags_convert(int flags)
83 {
84 int lflags;
85
86 #ifdef DEBUG
87 if (unlikely(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL))) {
88 printk(KERN_WARNING
89 "XFS: memory allocation with wrong flags (%x)\n", flags);
90 BUG();
91 }
92 #endif
93
94 if (flags & KM_NOSLEEP) {
95 lflags = GFP_ATOMIC;
96 } else {
97 lflags = GFP_KERNEL;
98
99 /* avoid recusive callbacks to filesystem during transactions */
100 if (PFLAGS_TEST_FSTRANS() || (flags & KM_NOFS))
101 lflags &= ~__GFP_FS;
102 }
103
104 return lflags;
105 }
106
107 static __inline kmem_zone_t *
kmem_zone_init(int size,char * zone_name)108 kmem_zone_init(int size, char *zone_name)
109 {
110 return kmem_cache_create(zone_name, size, 0, 0, NULL, NULL);
111 }
112
113 static __inline void
kmem_zone_free(kmem_zone_t * zone,void * ptr)114 kmem_zone_free(kmem_zone_t *zone, void *ptr)
115 {
116 kmem_cache_free(zone, ptr);
117 }
118
119 static __inline void
kmem_zone_destroy(kmem_zone_t * zone)120 kmem_zone_destroy(kmem_zone_t *zone)
121 {
122 if (zone && kmem_cache_destroy(zone))
123 BUG();
124 }
125
126 static __inline int
kmem_zone_shrink(kmem_zone_t * zone)127 kmem_zone_shrink(kmem_zone_t *zone)
128 {
129 return kmem_cache_shrink(zone);
130 }
131
132 extern void *kmem_zone_zalloc(kmem_zone_t *, int);
133 extern void *kmem_zone_alloc(kmem_zone_t *, int);
134
135 extern void *kmem_alloc(size_t, int);
136 extern void *kmem_realloc(void *, size_t, size_t, int);
137 extern void *kmem_zalloc(size_t, int);
138 extern void kmem_free(void *, size_t);
139
140 typedef void *kmem_shaker_t;
141 typedef int (*kmem_shake_func_t)(int, unsigned int);
142
143 extern kmem_shaker_t kmem_shake_register(kmem_shake_func_t);
144 extern void kmem_shake_deregister(kmem_shaker_t);
145
146 static __inline int
kmem_shake_allow(unsigned int gfp_mask)147 kmem_shake_allow(unsigned int gfp_mask)
148 {
149 return (gfp_mask & __GFP_WAIT);
150 }
151
152 #endif /* __XFS_SUPPORT_KMEM_H__ */
153