mirror of https://gitee.com/openkylin/linux.git
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
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*
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* Copyright (c) 2001-2005 Anton Altaparmakov
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*/
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#ifndef _LINUX_NTFS_MALLOC_H
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#define _LINUX_NTFS_MALLOC_H
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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/**
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* __ntfs_malloc - allocate memory in multiples of pages
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* @size: number of bytes to allocate
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* @gfp_mask: extra flags for the allocator
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*
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* Internal function. You probably want ntfs_malloc_nofs()...
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*
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* Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
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* returns a pointer to the allocated memory.
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*
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* If there was insufficient memory to complete the request, return NULL.
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* Depending on @gfp_mask the allocation may be guaranteed to succeed.
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*/
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static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
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{
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if (likely(size <= PAGE_SIZE)) {
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BUG_ON(!size);
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/* kmalloc() has per-CPU caches so is faster for now. */
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return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
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/* return (void *)__get_free_page(gfp_mask); */
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}
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if (likely((size >> PAGE_SHIFT) < totalram_pages()))
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return __vmalloc(size, gfp_mask, PAGE_KERNEL);
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return NULL;
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}
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/**
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* ntfs_malloc_nofs - allocate memory in multiples of pages
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* @size: number of bytes to allocate
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*
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* Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
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* returns a pointer to the allocated memory.
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*
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* If there was insufficient memory to complete the request, return NULL.
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*/
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static inline void *ntfs_malloc_nofs(unsigned long size)
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{
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return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM);
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}
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/**
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* ntfs_malloc_nofs_nofail - allocate memory in multiples of pages
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* @size: number of bytes to allocate
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*
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* Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
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* returns a pointer to the allocated memory.
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*
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* This function guarantees that the allocation will succeed. It will sleep
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* for as long as it takes to complete the allocation.
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*
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* If there was insufficient memory to complete the request, return NULL.
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*/
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static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
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{
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return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL);
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}
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static inline void ntfs_free(void *addr)
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{
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kvfree(addr);
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}
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#endif /* _LINUX_NTFS_MALLOC_H */
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