mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 16:41:58 +00:00
29b8990513
and cond_resched() in the main loop as we could be dirtying a lot of
pages and this ensures we play nice with the VM and the system as a
whole.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
98 lines
3.2 KiB
C
98 lines
3.2 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 < 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 */
|