Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
[cris-mirror.git] / fs / jffs2 / compr.h
blob13bb7597ab3987b5da405d5bd857e50b64dce4ab
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
5 * University of Szeged, Hungary
6 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
12 #ifndef __JFFS2_COMPR_H__
13 #define __JFFS2_COMPR_H__
15 #include <linux/kernel.h>
16 #include <linux/vmalloc.h>
17 #include <linux/list.h>
18 #include <linux/types.h>
19 #include <linux/string.h>
20 #include <linux/slab.h>
21 #include <linux/errno.h>
22 #include <linux/fs.h>
23 #include <linux/jffs2.h>
24 #include "jffs2_fs_i.h"
25 #include "jffs2_fs_sb.h"
26 #include "nodelist.h"
28 #define JFFS2_RUBINMIPS_PRIORITY 10
29 #define JFFS2_DYNRUBIN_PRIORITY 20
30 #define JFFS2_LZARI_PRIORITY 30
31 #define JFFS2_RTIME_PRIORITY 50
32 #define JFFS2_ZLIB_PRIORITY 60
33 #define JFFS2_LZO_PRIORITY 80
36 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
37 #define JFFS2_DYNRUBIN_DISABLED /* for decompression */
39 #define JFFS2_COMPR_MODE_NONE 0
40 #define JFFS2_COMPR_MODE_PRIORITY 1
41 #define JFFS2_COMPR_MODE_SIZE 2
42 #define JFFS2_COMPR_MODE_FAVOURLZO 3
44 #define FAVOUR_LZO_PERCENT 80
46 struct jffs2_compressor {
47 struct list_head list;
48 int priority; /* used by prirority comr. mode */
49 char *name;
50 char compr; /* JFFS2_COMPR_XXX */
51 int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
52 uint32_t *srclen, uint32_t *destlen);
53 int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
54 uint32_t cdatalen, uint32_t datalen);
55 int usecount;
56 int disabled; /* if set the compressor won't compress */
57 unsigned char *compr_buf; /* used by size compr. mode */
58 uint32_t compr_buf_size; /* used by size compr. mode */
59 uint32_t stat_compr_orig_size;
60 uint32_t stat_compr_new_size;
61 uint32_t stat_compr_blocks;
62 uint32_t stat_decompr_blocks;
65 int jffs2_register_compressor(struct jffs2_compressor *comp);
66 int jffs2_unregister_compressor(struct jffs2_compressor *comp);
68 int jffs2_compressors_init(void);
69 int jffs2_compressors_exit(void);
71 uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
72 unsigned char *data_in, unsigned char **cpage_out,
73 uint32_t *datalen, uint32_t *cdatalen);
75 int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
76 uint16_t comprtype, unsigned char *cdata_in,
77 unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
79 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
81 /* Compressor modules */
82 /* These functions will be called by jffs2_compressors_init/exit */
84 #ifdef CONFIG_JFFS2_RUBIN
85 int jffs2_rubinmips_init(void);
86 void jffs2_rubinmips_exit(void);
87 int jffs2_dynrubin_init(void);
88 void jffs2_dynrubin_exit(void);
89 #endif
90 #ifdef CONFIG_JFFS2_RTIME
91 int jffs2_rtime_init(void);
92 void jffs2_rtime_exit(void);
93 #endif
94 #ifdef CONFIG_JFFS2_ZLIB
95 int jffs2_zlib_init(void);
96 void jffs2_zlib_exit(void);
97 #endif
98 #ifdef CONFIG_JFFS2_LZO
99 int jffs2_lzo_init(void);
100 void jffs2_lzo_exit(void);
101 #endif
103 #endif /* __JFFS2_COMPR_H__ */