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1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. |
3 | * |
4 | * Copyright © 2007 Nokia Corporation. All rights reserved. |
5 | * |
6 | * Created by Richard Purdie <rpurdie@openedhand.com> |
7 | * |
8 | * For licensing information, see the file 'LICENCE' in this directory. |
9 | * |
10 | */ |
11 | |
12 | #include <linux/kernel.h> |
13 | #include <linux/sched.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/vmalloc.h> |
16 | #include <linux/init.h> |
17 | #include <linux/lzo.h> |
18 | #include "compr.h" |
19 | |
20 | static void *lzo_mem; |
21 | static void *lzo_compress_buf; |
22 | static DEFINE_MUTEX(deflate_mutex); /* for lzo_mem and lzo_compress_buf */ |
23 | |
24 | static void free_workspace(void) |
25 | { |
26 | vfree(lzo_mem); |
27 | vfree(lzo_compress_buf); |
28 | } |
29 | |
30 | static int __init alloc_workspace(void) |
31 | { |
32 | lzo_mem = vmalloc(LZO1X_MEM_COMPRESS); |
33 | lzo_compress_buf = vmalloc(lzo1x_worst_compress(PAGE_SIZE)); |
34 | |
35 | if (!lzo_mem || !lzo_compress_buf) { |
36 | printk(KERN_WARNING "Failed to allocate lzo deflate workspace\n"); |
37 | free_workspace(); |
38 | return -ENOMEM; |
39 | } |
40 | |
41 | return 0; |
42 | } |
43 | |
44 | static int jffs2_lzo_compress(unsigned char *data_in, unsigned char *cpage_out, |
45 | uint32_t *sourcelen, uint32_t *dstlen, void *model) |
46 | { |
47 | size_t compress_size; |
48 | int ret; |
49 | |
50 | mutex_lock(&deflate_mutex); |
51 | ret = lzo1x_1_compress(data_in, *sourcelen, lzo_compress_buf, &compress_size, lzo_mem); |
52 | if (ret != LZO_E_OK) |
53 | goto fail; |
54 | |
55 | if (compress_size > *dstlen) |
56 | goto fail; |
57 | |
58 | memcpy(cpage_out, lzo_compress_buf, compress_size); |
59 | mutex_unlock(&deflate_mutex); |
60 | |
61 | *dstlen = compress_size; |
62 | return 0; |
63 | |
64 | fail: |
65 | mutex_unlock(&deflate_mutex); |
66 | return -1; |
67 | } |
68 | |
69 | static int jffs2_lzo_decompress(unsigned char *data_in, unsigned char *cpage_out, |
70 | uint32_t srclen, uint32_t destlen, void *model) |
71 | { |
72 | size_t dl = destlen; |
73 | int ret; |
74 | |
75 | ret = lzo1x_decompress_safe(data_in, srclen, cpage_out, &dl); |
76 | |
77 | if (ret != LZO_E_OK || dl != destlen) |
78 | return -1; |
79 | |
80 | return 0; |
81 | } |
82 | |
83 | static struct jffs2_compressor jffs2_lzo_comp = { |
84 | .priority = JFFS2_LZO_PRIORITY, |
85 | .name = "lzo", |
86 | .compr = JFFS2_COMPR_LZO, |
87 | .compress = &jffs2_lzo_compress, |
88 | .decompress = &jffs2_lzo_decompress, |
89 | .disabled = 0, |
90 | }; |
91 | |
92 | int __init jffs2_lzo_init(void) |
93 | { |
94 | int ret; |
95 | |
96 | ret = alloc_workspace(); |
97 | if (ret < 0) |
98 | return ret; |
99 | |
100 | ret = jffs2_register_compressor(&jffs2_lzo_comp); |
101 | if (ret) |
102 | free_workspace(); |
103 | |
104 | return ret; |
105 | } |
106 | |
107 | void jffs2_lzo_exit(void) |
108 | { |
109 | jffs2_unregister_compressor(&jffs2_lzo_comp); |
110 | free_workspace(); |
111 | } |
112 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9