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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
3 *
Anton Altaparmakovf6098cf2005-09-19 09:41:39 +01004 * Copyright (c) 2001-2005 Anton Altaparmakov
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
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/**
Anton Altaparmakov06d0e3c2005-09-08 16:28:25 +010030 * __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()...
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.
40 * Depending on @gfp_mask the allocation may be guaranteed to succeed.
41 */
Anton Altaparmakov29b89902005-10-11 14:54:42 +010042static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
Anton Altaparmakov06d0e3c2005-09-08 16:28:25 +010043{
44 if (likely(size <= PAGE_SIZE)) {
45 BUG_ON(!size);
46 /* kmalloc() has per-CPU caches so is faster for now. */
Anton Altaparmakov89ecf382005-09-12 15:43:03 +010047 return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
Anton Altaparmakov06d0e3c2005-09-08 16:28:25 +010048 /* return (void *)__get_free_page(gfp_mask); */
49 }
50 if (likely(size >> PAGE_SHIFT < num_physpages))
51 return __vmalloc(size, gfp_mask, PAGE_KERNEL);
52 return NULL;
53}
54
55/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 * ntfs_malloc_nofs - allocate memory in multiples of pages
Anton Altaparmakov06d0e3c2005-09-08 16:28:25 +010057 * @size: number of bytes to allocate
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 *
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 */
64static inline void *ntfs_malloc_nofs(unsigned long size)
65{
Anton Altaparmakov06d0e3c2005-09-08 16:28:25 +010066 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 */
81static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
82{
83 return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084}
85
86static 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 */