72945d86dd
Rename the function to kmem_to_page and move it to kmem.h together with our kmem_large allocator that may either return kmalloced or vmalloc pages. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_SUPPORT_KMEM_H__
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#define __XFS_SUPPORT_KMEM_H__
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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/*
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* General memory allocation interfaces
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*/
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typedef unsigned __bitwise xfs_km_flags_t;
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#define KM_SLEEP ((__force xfs_km_flags_t)0x0001u)
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#define KM_NOSLEEP ((__force xfs_km_flags_t)0x0002u)
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#define KM_NOFS ((__force xfs_km_flags_t)0x0004u)
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#define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u)
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#define KM_ZERO ((__force xfs_km_flags_t)0x0010u)
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/*
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* We use a special process flag to avoid recursive callbacks into
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* the filesystem during transactions. We will also issue our own
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* warnings, so we explicitly skip any generic ones (silly of us).
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*/
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static inline gfp_t
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kmem_flags_convert(xfs_km_flags_t flags)
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{
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gfp_t lflags;
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BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_ZERO));
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if (flags & KM_NOSLEEP) {
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lflags = GFP_ATOMIC | __GFP_NOWARN;
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} else {
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lflags = GFP_KERNEL | __GFP_NOWARN;
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if (flags & KM_NOFS)
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lflags &= ~__GFP_FS;
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}
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/*
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* Default page/slab allocator behavior is to retry for ever
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* for small allocations. We can override this behavior by using
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* __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long
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* as it is feasible but rather fail than retry forever for all
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* request sizes.
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*/
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if (flags & KM_MAYFAIL)
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lflags |= __GFP_RETRY_MAYFAIL;
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if (flags & KM_ZERO)
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lflags |= __GFP_ZERO;
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return lflags;
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}
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extern void *kmem_alloc(size_t, xfs_km_flags_t);
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extern void *kmem_alloc_large(size_t size, xfs_km_flags_t);
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extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
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static inline void kmem_free(const void *ptr)
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{
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kvfree(ptr);
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}
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static inline void *
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kmem_zalloc(size_t size, xfs_km_flags_t flags)
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{
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return kmem_alloc(size, flags | KM_ZERO);
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}
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static inline void *
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kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
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{
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return kmem_alloc_large(size, flags | KM_ZERO);
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}
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/*
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* Zone interfaces
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*/
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#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
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#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
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#define KM_ZONE_SPREAD SLAB_MEM_SPREAD
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#define KM_ZONE_ACCOUNT SLAB_ACCOUNT
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#define kmem_zone kmem_cache
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#define kmem_zone_t struct kmem_cache
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static inline kmem_zone_t *
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kmem_zone_init(int size, char *zone_name)
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{
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return kmem_cache_create(zone_name, size, 0, 0, NULL);
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}
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static inline kmem_zone_t *
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kmem_zone_init_flags(int size, char *zone_name, slab_flags_t flags,
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void (*construct)(void *))
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{
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return kmem_cache_create(zone_name, size, 0, flags, construct);
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}
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static inline void
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kmem_zone_free(kmem_zone_t *zone, void *ptr)
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{
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kmem_cache_free(zone, ptr);
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}
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static inline void
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kmem_zone_destroy(kmem_zone_t *zone)
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{
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kmem_cache_destroy(zone);
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}
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extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
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static inline void *
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kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
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{
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return kmem_zone_alloc(zone, flags | KM_ZERO);
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}
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static inline struct page *
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kmem_to_page(void *addr)
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{
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if (is_vmalloc_addr(addr))
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return vmalloc_to_page(addr);
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return virt_to_page(addr);
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}
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#endif /* __XFS_SUPPORT_KMEM_H__ */
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