fs/ntfs/malloc.h

   1 /*
   2  * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
   3  *
   4  * Copyright (c) 2001-2004 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_nofs - allocate memory in multiples of pages
  31  * @size        number of bytes to allocate
  32  *
  33  * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
  34  * returns a pointer to the allocated memory.
  35  *
  36  * If there was insufficient memory to complete the request, return NULL.
  37  */
  38 static inline void *ntfs_malloc_nofs(unsigned long size)
  39 {
  40         if (likely(size <= PAGE_SIZE)) {
  41                 BUG_ON(!size);
  42                 /* kmalloc() has per-CPU caches so is faster for now. */
  43                 return kmalloc(PAGE_SIZE, GFP_NOFS);
  44                 /* return (void *)__get_free_page(GFP_NOFS | __GFP_HIGHMEM); */
  45         }
  46         if (likely(size >> PAGE_SHIFT < num_physpages))
  47                 return __vmalloc(size, GFP_NOFS | __GFP_HIGHMEM, PAGE_KERNEL);
  48         return NULL;
  49 }
  50
  51 static inline void ntfs_free(void *addr)
  52 {
  53         if (likely(((unsigned long)addr < VMALLOC_START) ||
  54                         ((unsigned long)addr >= VMALLOC_END ))) {
  55                 kfree(addr);
  56                 /* free_page((unsigned long)addr); */
  57                 return;
  58         }
  59         vfree(addr);
  60 }
  61
  62 #endif /* _LINUX_NTFS_MALLOC_H */