LXR linux/fs/jffs2/compr.h

   1/*
   2 * JFFS2 -- Journalling Flash File System, Version 2.
   3 *
   4 * Copyright © 2004   Ferenc Havasi <havasi@inf.u-szeged.hu>,
   5 *                    University of Szeged, Hungary
   6 *
   7 * For licensing information, see the file 'LICENCE' in this directory.
   8 *
   9 */
  10
  11#ifndef __JFFS2_COMPR_H__
  12#define __JFFS2_COMPR_H__
  13
  14#include <linux/kernel.h>
  15#include <linux/vmalloc.h>
  16#include <linux/list.h>
  17#include <linux/types.h>
  18#include <linux/string.h>
  19#include <linux/slab.h>
  20#include <linux/errno.h>
  21#include <linux/fs.h>
  22#include <linux/jffs2.h>
  23#include "jffs2_fs_i.h"
  24#include "jffs2_fs_sb.h"
  25#include "nodelist.h"
  26
  27#define JFFS2_RUBINMIPS_PRIORITY 10
  28#define JFFS2_DYNRUBIN_PRIORITY  20
  29#define JFFS2_LZARI_PRIORITY     30
  30#define JFFS2_RTIME_PRIORITY     50
  31#define JFFS2_ZLIB_PRIORITY      60
  32#define JFFS2_LZO_PRIORITY       80
  33
  34
  35#define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
  36#define JFFS2_DYNRUBIN_DISABLED  /*        for decompression */
  37
  38#define JFFS2_COMPR_MODE_NONE       0
  39#define JFFS2_COMPR_MODE_PRIORITY   1
  40#define JFFS2_COMPR_MODE_SIZE       2
  41#define JFFS2_COMPR_MODE_FAVOURLZO  3
  42
  43#define FAVOUR_LZO_PERCENT 80
  44
  45struct jffs2_compressor {
  46        struct list_head list;
  47        int priority;                   /* used by prirority comr. mode */
  48        char *name;
  49        char compr;                     /* JFFS2_COMPR_XXX */
  50        int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
  51                        uint32_t *srclen, uint32_t *destlen, void *model);
  52        int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
  53                          uint32_t cdatalen, uint32_t datalen, void *model);
  54        int usecount;
  55        int disabled;           /* if set the compressor won't compress */
  56        unsigned char *compr_buf;       /* used by size compr. mode */
  57        uint32_t compr_buf_size;        /* used by size compr. mode */
  58        uint32_t stat_compr_orig_size;
  59        uint32_t stat_compr_new_size;
  60        uint32_t stat_compr_blocks;
  61        uint32_t stat_decompr_blocks;
  62};
  63
  64int jffs2_register_compressor(struct jffs2_compressor *comp);
  65int jffs2_unregister_compressor(struct jffs2_compressor *comp);
  66
  67int jffs2_compressors_init(void);
  68int jffs2_compressors_exit(void);
  69
  70uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  71                        unsigned char *data_in, unsigned char **cpage_out,
  72                        uint32_t *datalen, uint32_t *cdatalen);
  73
  74int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  75                     uint16_t comprtype, unsigned char *cdata_in,
  76                     unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
  77
  78void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
  79
  80/* Compressor modules */
  81/* These functions will be called by jffs2_compressors_init/exit */
  82
  83#ifdef CONFIG_JFFS2_RUBIN
  84int jffs2_rubinmips_init(void);
  85void jffs2_rubinmips_exit(void);
  86int jffs2_dynrubin_init(void);
  87void jffs2_dynrubin_exit(void);
  88#endif
  89#ifdef CONFIG_JFFS2_RTIME
  90int jffs2_rtime_init(void);
  91void jffs2_rtime_exit(void);
  92#endif
  93#ifdef CONFIG_JFFS2_ZLIB
  94int jffs2_zlib_init(void);
  95void jffs2_zlib_exit(void);
  96#endif
  97#ifdef CONFIG_JFFS2_LZO
  98int jffs2_lzo_init(void);
  99void jffs2_lzo_exit(void);
 100#endif
 101
 102#endif /* __JFFS2_COMPR_H__ */
 103