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)
22 #define KM_NOLOCKDEP ((__force xfs_km_flags_t)0x0020u)
25 * We use a special process flag to avoid recursive callbacks into
26 * the filesystem during transactions. We will also issue our own
27 * warnings, so we explicitly skip any generic ones (silly of us).
30 kmem_flags_convert(xfs_km_flags_t flags)
34 BUG_ON(flags & ~(KM_NOFS | KM_MAYFAIL | KM_ZERO | KM_NOLOCKDEP));
36 lflags = GFP_KERNEL | __GFP_NOWARN;
41 * Default page/slab allocator behavior is to retry for ever
42 * for small allocations. We can override this behavior by using
43 * __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long
44 * as it is feasible but rather fail than retry forever for all
47 if (flags & KM_MAYFAIL)
48 lflags |= __GFP_RETRY_MAYFAIL;
53 if (flags & KM_NOLOCKDEP)
54 lflags |= __GFP_NOLOCKDEP;
59 extern void *kmem_alloc(size_t, xfs_km_flags_t);
60 extern void *kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags);
61 extern void *kmem_alloc_large(size_t size, xfs_km_flags_t);
62 static inline void kmem_free(const void *ptr)
69 kmem_zalloc(size_t size, xfs_km_flags_t flags)
71 return kmem_alloc(size, flags | KM_ZERO);
78 #define kmem_zone kmem_cache
79 #define kmem_zone_t struct kmem_cache
81 static inline struct page *
82 kmem_to_page(void *addr)
84 if (is_vmalloc_addr(addr))
85 return vmalloc_to_page(addr);
86 return virt_to_page(addr);
89 #endif /* __XFS_SUPPORT_KMEM_H__ */