// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. */ #ifndef __XFS_SUPPORT_KMEM_H__ #define __XFS_SUPPORT_KMEM_H__ #include <linux/slab.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/vmalloc.h> /* * General memory allocation interfaces */ typedef unsigned __bitwise xfs_km_flags_t; #define KM_NOFS ((__force xfs_km_flags_t)0x0004u) #define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u) #define KM_ZERO ((__force xfs_km_flags_t)0x0010u) /* * We use a special process flag to avoid recursive callbacks into * the filesystem during transactions. We will also issue our own * warnings, so we explicitly skip any generic ones (silly of us). */ static inline gfp_t kmem_flags_convert(xfs_km_flags_t flags) { gfp_t lflags; BUG_ON(flags & ~(KM_NOFS|KM_MAYFAIL|KM_ZERO)); lflags = GFP_KERNEL | __GFP_NOWARN; if (flags & KM_NOFS) lflags &= ~__GFP_FS; /* * Default page/slab allocator behavior is to retry for ever * for small allocations. We can override this behavior by using * __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long * as it is feasible but rather fail than retry forever for all * request sizes. */ if (flags & KM_MAYFAIL) lflags |= __GFP_RETRY_MAYFAIL; if (flags & KM_ZERO) lflags |= __GFP_ZERO; return lflags; } extern void *kmem_alloc(size_t, xfs_km_flags_t); extern void *kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags); extern void *kmem_alloc_large(size_t size, xfs_km_flags_t); extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t); static inline void kmem_free(const void *ptr) { kvfree(ptr); } static inline void * kmem_zalloc(size_t size, xfs_km_flags_t flags) { return kmem_alloc(size, flags | KM_ZERO); } static inline void * kmem_zalloc_large(size_t size, xfs_km_flags_t flags) { return kmem_alloc_large(size, flags | KM_ZERO); } /* * Zone interfaces */ #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT #define KM_ZONE_SPREAD SLAB_MEM_SPREAD #define KM_ZONE_ACCOUNT SLAB_ACCOUNT #define kmem_zone kmem_cache #define kmem_zone_t struct kmem_cache static inline kmem_zone_t * kmem_zone_init(int size, char *zone_name) { return kmem_cache_create(zone_name, size, 0, 0, NULL); } static inline kmem_zone_t * kmem_zone_init_flags(int size, char *zone_name, slab_flags_t flags, void (*construct)(void *)) { return kmem_cache_create(zone_name, size, 0, flags, construct); } static inline void kmem_zone_free(kmem_zone_t *zone, void *ptr) { kmem_cache_free(zone, ptr); } static inline void kmem_zone_destroy(kmem_zone_t *zone) { kmem_cache_destroy(zone); } extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t); static inline void * kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags) { return kmem_zone_alloc(zone, flags | KM_ZERO); } static inline struct page * kmem_to_page(void *addr) { if (is_vmalloc_addr(addr)) return vmalloc_to_page(addr); return virt_to_page(addr); } #endif /* __XFS_SUPPORT_KMEM_H__ */