1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
6 #ifndef __XFS_SUPPORT_KMEM_H__
7 #define __XFS_SUPPORT_KMEM_H__
9 #include <linux/slab.h>
10 #include <linux/sched.h>
12 #include <linux/vmalloc.h>
15 * General memory allocation interfaces
18 typedef unsigned __bitwise xfs_km_flags_t;
19 #define KM_NOFS ((__force xfs_km_flags_t)0x0004u)
20 #define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u)
21 #define KM_ZERO ((__force xfs_km_flags_t)0x0010u)
24 * We use a special process flag to avoid recursive callbacks into
25 * the filesystem during transactions. We will also issue our own
26 * warnings, so we explicitly skip any generic ones (silly of us).
29 kmem_flags_convert(xfs_km_flags_t flags)
33 BUG_ON(flags & ~(KM_NOFS|KM_MAYFAIL|KM_ZERO));
35 lflags = GFP_KERNEL | __GFP_NOWARN;
40 * Default page/slab allocator behavior is to retry for ever
41 * for small allocations. We can override this behavior by using
42 * __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long
43 * as it is feasible but rather fail than retry forever for all
46 if (flags & KM_MAYFAIL)
47 lflags |= __GFP_RETRY_MAYFAIL;
55 extern void *kmem_alloc(size_t, xfs_km_flags_t);
56 extern void *kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags);
57 extern void *kmem_alloc_large(size_t size, xfs_km_flags_t);
58 extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
59 static inline void kmem_free(const void *ptr)
66 kmem_zalloc(size_t size, xfs_km_flags_t flags)
68 return kmem_alloc(size, flags | KM_ZERO);
72 kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
74 return kmem_alloc_large(size, flags | KM_ZERO);
81 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
82 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
83 #define KM_ZONE_SPREAD SLAB_MEM_SPREAD
84 #define KM_ZONE_ACCOUNT SLAB_ACCOUNT
86 #define kmem_zone kmem_cache
87 #define kmem_zone_t struct kmem_cache
89 static inline kmem_zone_t *
90 kmem_zone_init(int size, char *zone_name)
92 return kmem_cache_create(zone_name, size, 0, 0, NULL);
95 static inline kmem_zone_t *
96 kmem_zone_init_flags(int size, char *zone_name, slab_flags_t flags,
97 void (*construct)(void *))
99 return kmem_cache_create(zone_name, size, 0, flags, construct);
103 kmem_zone_free(kmem_zone_t *zone, void *ptr)
105 kmem_cache_free(zone, ptr);
109 kmem_zone_destroy(kmem_zone_t *zone)
111 kmem_cache_destroy(zone);
114 extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
117 kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
119 return kmem_zone_alloc(zone, flags | KM_ZERO);
122 static inline struct page *
123 kmem_to_page(void *addr)
125 if (is_vmalloc_addr(addr))
126 return vmalloc_to_page(addr);
127 return virt_to_page(addr);
130 #endif /* __XFS_SUPPORT_KMEM_H__ */