[mirror_ubuntu-bionic-kernel.git] / fs / ntfs / malloc.h

/*
 * 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)
{
	kvfree(addr);
}

#endif /* _LINUX_NTFS_MALLOC_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
	3	*
f6098cf4	4	* Copyright (c) 2001-2005 Anton Altaparmakov
1da177e4 LT	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	/**
06d0e3cf AA	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()...
1da177e4 LT	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.
06d0e3cf	40	* Depending on @gfp_mask the allocation may be guaranteed to succeed.
1da177e4	41	*/
29b89905	42	static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
1da177e4 LT	43	{
	44	if (likely(size <= PAGE_SIZE)) {
	45	BUG_ON(!size);
	46	/* kmalloc() has per-CPU caches so is faster for now. */
89ecf38c	47	return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
06d0e3cf	48	/* return (void )__get_free_page(gfp_mask); /
1da177e4	49	}
4481374c	50	if (likely((size >> PAGE_SHIFT) < totalram_pages))
06d0e3cf	51	return __vmalloc(size, gfp_mask, PAGE_KERNEL);
1da177e4 LT	52	return NULL;
	53	}
	54
06d0e3cf AA	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	*/
	64	static 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	*/
	81	static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
	82	{
	83	return __ntfs_malloc(size, GFP_NOFS \| __GFP_HIGHMEM \| __GFP_NOFAIL);
	84	}
	85
1da177e4 LT	86	static inline void ntfs_free(void *addr)
1da177e4 LT	87	{
b0cbeee7	88	kvfree(addr);
1da177e4 LT	89	}
	90
	91	#endif /* _LINUX_NTFS_MALLOC_H */