release/src-rt-6.x/linux/linux-2.6/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
  42 struct jffs2_compressor {
  43         struct list_head list;
  44         int priority;              /* used by prirority comr. mode */
  45         char *name;
  46         char compr;                /* JFFS2_COMPR_XXX */
  47         int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
  48                         uint32_t *srclen, uint32_t *destlen, void *model);
  49         int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
  50                         uint32_t cdatalen, uint32_t datalen, void *model);
  51         int usecount;
  52         int disabled;              /* if seted the compressor won't compress */
  53         unsigned char *compr_buf;  /* used by size compr. mode */
  54         uint32_t compr_buf_size;   /* used by size compr. mode */
  55         uint32_t stat_compr_orig_size;
  56         uint32_t stat_compr_new_size;
  57         uint32_t stat_compr_blocks;
  58         uint32_t stat_decompr_blocks;
  59 };
  60
  61 int jffs2_register_compressor(struct jffs2_compressor *comp);
  62 int jffs2_unregister_compressor(struct jffs2_compressor *comp);
  63
  64 int jffs2_compressors_init(void);
  65 int jffs2_compressors_exit(void);
  66
  67 uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  68                              unsigned char *data_in, unsigned char **cpage_out,
  69                              uint32_t *datalen, uint32_t *cdatalen);
  70
  71 int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  72                      uint16_t comprtype, unsigned char *cdata_in,
  73                      unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
  74
  75 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
  76
  77 /* Compressor modules */
  78 /* These functions will be called by jffs2_compressors_init/exit */
  79
  80 #ifdef CONFIG_JFFS2_RUBIN
  81 int jffs2_rubinmips_init(void);
  82 void jffs2_rubinmips_exit(void);
  83 int jffs2_dynrubin_init(void);
  84 void jffs2_dynrubin_exit(void);
  85 #endif
  86 #ifdef CONFIG_JFFS2_RTIME
  87 int jffs2_rtime_init(void);
  88 void jffs2_rtime_exit(void);
  89 #endif
  90 #ifdef CONFIG_JFFS2_ZLIB
  91 int jffs2_zlib_init(void);
  92 void jffs2_zlib_exit(void);
  93 #endif
  94
  95 #endif /* __JFFS2_COMPR_H__ */