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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright © 2007 Nokia Corporation. All rights reserved.
* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
*
* Created by Richard Purdie <rpurdie@openedhand.com>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/lzo.h>
#include "compr.h"
static void *lzo_mem;
static void *lzo_compress_buf;
static DEFINE_MUTEX(deflate_mutex); /* for lzo_mem and lzo_compress_buf */
static void free_workspace(void)
{
vfree(lzo_mem);
vfree(lzo_compress_buf);
}
static int __init alloc_workspace(void)
{
lzo_mem = vmalloc(LZO1X_MEM_COMPRESS);
lzo_compress_buf = vmalloc(lzo1x_worst_compress(PAGE_SIZE));
if (!lzo_mem || !lzo_compress_buf) {
printk(KERN_WARNING "Failed to allocate lzo deflate workspace\n");
free_workspace();
return -ENOMEM;
}
return 0;
}
static int jffs2_lzo_compress(unsigned char *data_in, unsigned char *cpage_out,
uint32_t *sourcelen, uint32_t *dstlen, void *model)
{
size_t compress_size;
int ret;
mutex_lock(&deflate_mutex);
ret = lzo1x_1_compress(data_in, *sourcelen, lzo_compress_buf, &compress_size, lzo_mem);
if (ret != LZO_E_OK)
goto fail;
if (compress_size > *dstlen)
goto fail;
memcpy(cpage_out, lzo_compress_buf, compress_size);
mutex_unlock(&deflate_mutex);
*dstlen = compress_size;
return 0;
fail:
mutex_unlock(&deflate_mutex);
return -1;
}
static int jffs2_lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,
uint32_t srclen, uint32_t destlen, void *model)
{
size_t dl = destlen;
int ret;
ret = lzo1x_decompress_safe(data_in, srclen, cpage_out, &dl);
if (ret != LZO_E_OK || dl != destlen)
return -1;
return 0;
}
static struct jffs2_compressor jffs2_lzo_comp = {
.priority = JFFS2_LZO_PRIORITY,
.name = "lzo",
.compr = JFFS2_COMPR_LZO,
.compress = &jffs2_lzo_compress,
.decompress = &jffs2_lzo_decompress,
.disabled = 0,
};
int __init jffs2_lzo_init(void)
{
int ret;
ret = alloc_workspace();
if (ret < 0)
return ret;
ret = jffs2_register_compressor(&jffs2_lzo_comp);
if (ret)
free_workspace();
return ret;
}
void jffs2_lzo_exit(void)
{
jffs2_unregister_compressor(&jffs2_lzo_comp);
free_workspace();
}
|
