exfat-linux/compat.h at master · ndmsystems/exfat-linux · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
 */

#ifndef _EXFAT_COMPAT_H
#define _EXFAT_COMPAT_H

#include <linux/version.h>
#include <linux/mm.h>

#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
#error "This driver doesn't support v5.8+, " \
       "please use the included driver from your kernel"
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0)
#error "This driver doesn't support kernel versions lower than v4.9, " \
       "please use the driver from https://github.com/arter97/exfat-linux/tree/old"
#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
#include <linux/iversion.h>
#else
#define inode_inc_iversion(inode) (inode->i_version++)
#define inode_query_iversion(inode) (inode->i_version)
#define inode_eq_iversion(inode, version) (inode->i_version == version)
#define inode_peek_iversion_raw(inode) (inode->i_version)
#define inode_set_iversion(inode, val) (inode->i_version = val)
#endif

/* MS flags were renamed to SB on v4.15 */
#ifndef SB_NODIRATIME
#define SB_NODIRATIME MS_NODIRATIME
#endif

#ifndef SB_RDONLY
#define SB_RDONLY MS_RDONLY
#endif

#ifndef SB_SYNCHRONOUS
#define SB_SYNCHRONOUS MS_SYNCHRONOUS
#endif

#ifndef sb_rdonly
#define sb_rdonly(sb) ((sb)->s_flags & SB_RDONLY)
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 12, 0)
#include <linux/vmalloc.h>
#include <linux/slab.h>

static void *kvzalloc(size_t sz, gfp_t flags)
{
	void *ptr = kzalloc(sz, flags | __GFP_NOWARN);

	if (!ptr)
		ptr = vzalloc(sz);
	return ptr;
}

static inline void *kvmalloc_array(size_t n, size_t size, gfp_t flags)
{
	if (size != 0 && n > SIZE_MAX / size)
		return NULL;

	return kvzalloc(n * size, flags);
}
#endif

#endif /* _EXFAT_COMPAT_H */