LXR linux/fs/ntfs/malloc.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
   4 *
   5 * Copyright (c) 2001-2005 Anton Altaparmakov
   6 */
   7
   8#ifndef _LINUX_NTFS_MALLOC_H
   9#define _LINUX_NTFS_MALLOC_H
  10
  11#include <linux/vmalloc.h>
  12#include <linux/slab.h>
  13#include <linux/highmem.h>
  14
  15/**
  16 * __ntfs_malloc - allocate memory in multiples of pages
  17 * @size:       number of bytes to allocate
  18 * @gfp_mask:   extra flags for the allocator
  19 *
  20 * Internal function.  You probably want ntfs_malloc_nofs()...
  21 *
  22 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
  23 * returns a pointer to the allocated memory.
  24 *
  25 * If there was insufficient memory to complete the request, return NULL.
  26 * Depending on @gfp_mask the allocation may be guaranteed to succeed.
  27 */
  28static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
  29{
  30        if (likely(size <= PAGE_SIZE)) {
  31                BUG_ON(!size);
  32                /* kmalloc() has per-CPU caches so is faster for now. */
  33                return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
  34                /* return (void *)__get_free_page(gfp_mask); */
  35        }
  36        if (likely((size >> PAGE_SHIFT) < totalram_pages()))
  37                return __vmalloc(size, gfp_mask, PAGE_KERNEL);
  38        return NULL;
  39}
  40
  41/**
  42 * ntfs_malloc_nofs - allocate memory in multiples of pages
  43 * @size:       number of bytes to allocate
  44 *
  45 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
  46 * returns a pointer to the allocated memory.
  47 *
  48 * If there was insufficient memory to complete the request, return NULL.
  49 */
  50static inline void *ntfs_malloc_nofs(unsigned long size)
  51{
  52        return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM);
  53}
  54
  55/**
  56 * ntfs_malloc_nofs_nofail - allocate memory in multiples of pages
  57 * @size:       number of bytes to allocate
  58 *
  59 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
  60 * returns a pointer to the allocated memory.
  61 *
  62 * This function guarantees that the allocation will succeed.  It will sleep
  63 * for as long as it takes to complete the allocation.
  64 *
  65 * If there was insufficient memory to complete the request, return NULL.
  66 */
  67static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
  68{
  69        return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL);
  70}
  71
  72static inline void ntfs_free(void *addr)
  73{
  74        kvfree(addr);
  75}
  76
  77#endif /* _LINUX_NTFS_MALLOC_H */
  78