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linux-next/fs/ntfs/malloc.h
Jan Beulich 4481374ce8 mm: replace various uses of num_physpages by totalram_pages
Sizing of memory allocations shouldn't depend on the number of physical
pages found in a system, as that generally includes (perhaps a huge amount
of) non-RAM pages.  The amount of what actually is usable as storage
should instead be used as a basis here.

Some of the calculations (i.e.  those not intending to use high memory)
should likely even use (totalram_pages - totalhigh_pages).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Dave Airlie <airlied@linux.ie>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-22 07:17:38 -07:00

97 lines
3.1 KiB
C

/*
* 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 */