|
|
/*
* 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 < num_physpages))
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 (likely(((unsigned long)addr < VMALLOC_START) ||
((unsigned long)addr >= VMALLOC_END ))) {
kfree(addr);
/* free_page((unsigned long)addr); */
return;
}
vfree(addr);
}
#endif /* _LINUX_NTFS_MALLOC_H */
|
