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1da177e4 LT |
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 */ |