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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 LT |
49 | } |
50 | if (likely(size >> PAGE_SHIFT < num_physpages)) | |
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) |
87 | { | |
88 | if (likely(((unsigned long)addr < VMALLOC_START) || | |
89 | ((unsigned long)addr >= VMALLOC_END ))) { | |
90 | kfree(addr); | |
91 | /* free_page((unsigned long)addr); */ | |
92 | return; | |
93 | } | |
94 | vfree(addr); | |
95 | } | |
96 | ||
97 | #endif /* _LINUX_NTFS_MALLOC_H */ |