2 * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
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.
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.
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
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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.
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.
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28 * For further information regarding this notice, see:
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32 #ifndef __XFS_SUPPORT_KMEM_H__
33 #define __XFS_SUPPORT_KMEM_H__
36 #include <linux/highmem.h>
37 #include <linux/slab.h>
38 #include <linux/vmalloc.h>
41 * Cutoff point to use vmalloc instead of kmalloc.
43 #define MAX_SLAB_SIZE 0x10000
46 * XFS uses slightly different names for these due to the
49 #define kmem_zone kmem_cache_s
50 #define kmem_zone_t kmem_cache_t
52 #define KM_SLEEP 0x0001
53 #define KM_NOSLEEP 0x0002
54 #define KM_NOFS 0x0004
58 * XXX get rid of the unconditional __GFP_NOFAIL by adding
59 * a KM_FAIL flag and using it where we're allowed to fail.
61 static __inline unsigned int
62 flag_convert(int flags)
65 if (unlikely(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS))) {
67 "XFS: memory allocation with wrong flags (%x)\n", flags);
72 if (flags & KM_NOSLEEP)
74 /* If we're in a transaction, FS activity is not ok */
75 else if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
76 return GFP_NOFS | __GFP_NOFAIL;
77 return GFP_KERNEL | __GFP_NOFAIL;
80 static __inline void *
81 kmem_alloc(size_t size, int flags)
83 if (unlikely(MAX_SLAB_SIZE < size))
84 /* Avoid doing filesystem sensitive stuff to get this */
85 return __vmalloc(size, flag_convert(flags), PAGE_KERNEL);
86 return kmalloc(size, flag_convert(flags));
89 static __inline void *
90 kmem_zalloc(size_t size, int flags)
92 void *ptr = kmem_alloc(size, flags);
93 if (likely(ptr != NULL))
99 kmem_free(void *ptr, size_t size)
101 if (unlikely((unsigned long)ptr < VMALLOC_START ||
102 (unsigned long)ptr >= VMALLOC_END))
108 static __inline void *
109 kmem_realloc(void *ptr, size_t newsize, size_t oldsize, int flags)
111 void *new = kmem_alloc(newsize, flags);
113 if (likely(ptr != NULL)) {
114 if (likely(new != NULL))
115 memcpy(new, ptr, min(oldsize, newsize));
116 kmem_free(ptr, oldsize);
122 static __inline kmem_zone_t *
123 kmem_zone_init(int size, char *zone_name)
125 return kmem_cache_create(zone_name, size, 0, 0, NULL, NULL);
128 static __inline void *
129 kmem_zone_alloc(kmem_zone_t *zone, int flags)
131 return kmem_cache_alloc(zone, flag_convert(flags));
134 static __inline void *
135 kmem_zone_zalloc(kmem_zone_t *zone, int flags)
137 void *ptr = kmem_zone_alloc(zone, flags);
138 if (likely(ptr != NULL))
139 memset(ptr, 0, kmem_cache_size(zone));
144 kmem_zone_free(kmem_zone_t *zone, void *ptr)
146 kmem_cache_free(zone, ptr);
149 #endif /* __XFS_SUPPORT_KMEM_H__ */