LXR linux/fs/ntfs/malloc.h

   1/*
   2 * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
   3 *
   4 * Copyright (c) 2001-2005 Anton Altaparmakov
   5 *
   6 * This program/include file is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License as published
   8 * by the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program/include file is distributed in the hope that it will be
  12 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program (in the main directory of the Linux-NTFS
  18 * distribution in the file COPYING); if not, write to the Free Software
  19 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 */
  21
  22#ifndef _LINUX_NTFS_MALLOC_H
  23#define _LINUX_NTFS_MALLOC_H
  24
  25#include <linux/vmalloc.h>
  26#include <linux/slab.h>
  27#include <linux/highmem.h>
  28
  29/**
  30 * __ntfs_malloc - allocate memory in multiples of pages
  31 * @size:       number of bytes to allocate
  32 * @gfp_mask:   extra flags for the allocator
  33 *
  34 * Internal function.  You probably want ntfs_malloc_nofs()...
  35 *
  36 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
  37 * returns a pointer to the allocated memory.
  38 *
  39 * If there was insufficient memory to complete the request, return NULL.
  40 * Depending on @gfp_mask the allocation may be guaranteed to succeed.
  41 */
  42static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
  43{
  44        if (likely(size <= PAGE_SIZE)) {
  45                BUG_ON(!size);
  46                /* kmalloc() has per-CPU caches so is faster for now. */
  47                return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
  48                /* return (void *)__get_free_page(gfp_mask); */
  49        }
  50        if (likely((size >> PAGE_SHIFT) < totalram_pages))
  51                return __vmalloc(size, gfp_mask, PAGE_KERNEL);
  52        return NULL;
  53}
  54
  55/**
  56 * ntfs_malloc_nofs - 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 * If there was insufficient memory to complete the request, return NULL.
  63 */
  64static inline void *ntfs_malloc_nofs(unsigned long size)
  65{
  66        return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM);
  67}
  68
  69/**
  70 * ntfs_malloc_nofs_nofail - allocate memory in multiples of pages
  71 * @size:       number of bytes to allocate
  72 *
  73 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
  74 * returns a pointer to the allocated memory.
  75 *
  76 * This function guarantees that the allocation will succeed.  It will sleep
  77 * for as long as it takes to complete the allocation.
  78 *
  79 * If there was insufficient memory to complete the request, return NULL.
  80 */
  81static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
  82{
  83        return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL);
  84}
  85
  86static inline void ntfs_free(void *addr)
  87{
  88        kvfree(addr);
  89}
  90
  91#endif /* _LINUX_NTFS_MALLOC_H */
  92