/*
   * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
   *
   * Copyright (c) 2001-2005 Anton Altaparmakov
   *
   * This program/include file is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as published
   * by the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program/include file is distributed in the hope that it will be
   * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
   * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program (in the main directory of the Linux-NTFS
   * distribution in the file COPYING); if not, write to the Free Software
   * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #ifndef _LINUX_NTFS_MALLOC_H
  #define _LINUX_NTFS_MALLOC_H
  
  #include <linux/vmalloc.h>
  #include <linux/slab.h>
  #include <linux/highmem.h>
  
  /**
   * __ntfs_malloc - allocate memory in multiples of pages
   * @size:	number of bytes to allocate
   * @gfp_mask:	extra flags for the allocator
   *
   * Internal function.  You probably want ntfs_malloc_nofs()...
   *
   * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
   * returns a pointer to the allocated memory.
   *
   * If there was insufficient memory to complete the request, return NULL.
   * Depending on @gfp_mask the allocation may be guaranteed to succeed.
   */
  static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
  {
  	if (likely(size <= PAGE_SIZE)) {
  		BUG_ON(!size);
  		/* kmalloc() has per-CPU caches so is faster for now. */
  		return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
  		/* return (void *)__get_free_page(gfp_mask); */
  	}
  	if (likely((size >> PAGE_SHIFT) < totalram_pages))
  		return __vmalloc(size, gfp_mask, PAGE_KERNEL);
  	return NULL;
  }
  
  /**
   * ntfs_malloc_nofs - allocate memory in multiples of pages
   * @size:	number of bytes to allocate
   *
   * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
   * returns a pointer to the allocated memory.
   *
   * If there was insufficient memory to complete the request, return NULL.
   */
  static inline void *ntfs_malloc_nofs(unsigned long size)
  {
  	return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM);
  }
  
  /**
   * ntfs_malloc_nofs_nofail - allocate memory in multiples of pages
   * @size:	number of bytes to allocate
   *
   * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
   * returns a pointer to the allocated memory.
   *
   * This function guarantees that the allocation will succeed.  It will sleep
   * for as long as it takes to complete the allocation.
   *
   * If there was insufficient memory to complete the request, return NULL.
   */
  static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
  {
  	return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL);
  }
  
  static inline void ntfs_free(void *addr)
  {
  	if (!is_vmalloc_addr(addr)) {
  		kfree(addr);
  		/* free_page((unsigned long)addr); */
  		return;
  	}
  	vfree(addr);
  }
  
  #endif /* _LINUX_NTFS_MALLOC_H */