Root/fs/ntfs/malloc.h

1/*
2 * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
3 *
4 * Copyright (c) 2001-2005 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 - 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 */
42static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
43{
44    if (likely(size <= PAGE_SIZE)) {
45        BUG_ON(!size);
46        /* kmalloc() has per-CPU caches so is faster for now. */
47        return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
48        /* return (void *)__get_free_page(gfp_mask); */
49    }
50    if (likely((size >> PAGE_SHIFT) < totalram_pages))
51        return __vmalloc(size, gfp_mask, PAGE_KERNEL);
52    return NULL;
53}
54
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 */
64static 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 */
81static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
82{
83    return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL);
84}
85
86static inline void ntfs_free(void *addr)
87{
88    if (!is_vmalloc_addr(addr)) {
89        kfree(addr);
90        /* free_page((unsigned long)addr); */
91        return;
92    }
93    vfree(addr);
94}
95
96#endif /* _LINUX_NTFS_MALLOC_H */
97

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