fs/jffs2/compr.h

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright (C) 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
   5  *                    University of Szeged, Hungary
   6  *
   7  * For licensing information, see the file 'LICENCE' in the
   8  * jffs2 directory.
   9  *
  10  * $Id: compr.h,v 1.9 2005/11/07 11:14:38 gleixner Exp $
  11  *
  12  */
  13
  14 #ifndef __JFFS2_COMPR_H__
  15 #define __JFFS2_COMPR_H__
  16
  17 #include <linux/kernel.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/list.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/slab.h>
  23 #include <linux/errno.h>
  24 #include <linux/fs.h>
  25 #include <linux/jffs2.h>
  26 #include "jffs2_fs_i.h"
  27 #include "jffs2_fs_sb.h"
  28 #include "nodelist.h"
  29
  30 #define JFFS2_RUBINMIPS_PRIORITY 10
  31 #define JFFS2_DYNRUBIN_PRIORITY  20
  32 #define JFFS2_LZARI_PRIORITY     30
  33 #define JFFS2_LZO_PRIORITY       40
  34 #define JFFS2_RTIME_PRIORITY     50
  35 #define JFFS2_ZLIB_PRIORITY      60
  36
  37 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
  38 #define JFFS2_DYNRUBIN_DISABLED  /*        for decompression */
  39
  40 #define JFFS2_COMPR_MODE_NONE       0
  41 #define JFFS2_COMPR_MODE_PRIORITY   1
  42 #define JFFS2_COMPR_MODE_SIZE       2
  43
  44 struct jffs2_compressor {
  45         struct list_head list;
  46         int priority;              /* used by prirority comr. mode */
  47         char *name;
  48         char compr;                /* JFFS2_COMPR_XXX */
  49         int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
  50                         uint32_t *srclen, uint32_t *destlen, void *model);
  51         int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
  52                         uint32_t cdatalen, uint32_t datalen, void *model);
  53         int usecount;
  54         int disabled;              /* if seted the compressor won't compress */
  55         unsigned char *compr_buf;  /* used by size compr. mode */
  56         uint32_t compr_buf_size;   /* used by size compr. mode */
  57         uint32_t stat_compr_orig_size;
  58         uint32_t stat_compr_new_size;
  59         uint32_t stat_compr_blocks;
  60         uint32_t stat_decompr_blocks;
  61 };
  62
  63 int jffs2_register_compressor(struct jffs2_compressor *comp);
  64 int jffs2_unregister_compressor(struct jffs2_compressor *comp);
  65
  66 int jffs2_compressors_init(void);
  67 int jffs2_compressors_exit(void);
  68
  69 uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  70                              unsigned char *data_in, unsigned char **cpage_out,
  71                              uint32_t *datalen, uint32_t *cdatalen);
  72
  73 int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  74                      uint16_t comprtype, unsigned char *cdata_in,
  75                      unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
  76
  77 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
  78
  79 #ifdef CONFIG_JFFS2_PROC
  80 int jffs2_enable_compressor_name(const char *name);
  81 int jffs2_disable_compressor_name(const char *name);
  82 int jffs2_set_compression_mode_name(const char *mode_name);
  83 char *jffs2_get_compression_mode_name(void);
  84 int jffs2_set_compressor_priority(const char *mode_name, int priority);
  85 char *jffs2_list_compressors(void);
  86 char *jffs2_stats(void);
  87 #endif
  88
  89 /* Compressor modules */
  90 /* These functions will be called by jffs2_compressors_init/exit */
  91
  92 #ifdef CONFIG_JFFS2_RUBIN
  93 int jffs2_rubinmips_init(void);
  94 void jffs2_rubinmips_exit(void);
  95 int jffs2_dynrubin_init(void);
  96 void jffs2_dynrubin_exit(void);
  97 #endif
  98 #ifdef CONFIG_JFFS2_RTIME
  99 int jffs2_rtime_init(void);
 100 void jffs2_rtime_exit(void);
 101 #endif
 102 #ifdef CONFIG_JFFS2_ZLIB
 103 int jffs2_zlib_init(void);
 104 void jffs2_zlib_exit(void);
 105 #endif
 106
 107 #endif /* __JFFS2_COMPR_H__ */