| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project. |
| 3 | * |
| 4 | * Copyright (c) 2001-2004 Anton Altaparmakov |
| 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 | /** |
| 30 | * ntfs_malloc_nofs - allocate memory in multiples of pages |
| 31 | * @size number of bytes to allocate |
| 32 | * |
| 33 | * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and |
| 34 | * returns a pointer to the allocated memory. |
| 35 | * |
| 36 | * If there was insufficient memory to complete the request, return NULL. |
| 37 | */ |
| 38 | static inline void *ntfs_malloc_nofs(unsigned long size) |
| 39 | { |
| 40 | if (likely(size <= PAGE_SIZE)) { |
| 41 | BUG_ON(!size); |
| 42 | /* kmalloc() has per-CPU caches so is faster for now. */ |
| 43 | return kmalloc(PAGE_SIZE, GFP_NOFS); |
| 44 | /* return (void *)__get_free_page(GFP_NOFS | __GFP_HIGHMEM); */ |
| 45 | } |
| 46 | if (likely(size >> PAGE_SHIFT < num_physpages)) |
| 47 | return __vmalloc(size, GFP_NOFS | __GFP_HIGHMEM, PAGE_KERNEL); |
| 48 | return NULL; |
| 49 | } |
| 50 | |
| 51 | static inline void ntfs_free(void *addr) |
| 52 | { |
| 53 | if (likely(((unsigned long)addr < VMALLOC_START) || |
| 54 | ((unsigned long)addr >= VMALLOC_END ))) { |
| 55 | kfree(addr); |
| 56 | /* free_page((unsigned long)addr); */ |
| 57 | return; |
| 58 | } |
| 59 | vfree(addr); |
| 60 | } |
| 61 | |
| 62 | #endif /* _LINUX_NTFS_MALLOC_H */ |