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 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 */ 11 12 #ifndef __JFFS2_COMPR_H__ 13 #define __JFFS2_COMPR_H__ 14 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" 27 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 34 35 36 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ 37 #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ 38 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 43 #define JFFS2_COMPR_MODE_FORCELZO 4 44 #define JFFS2_COMPR_MODE_FORCEZLIB 5 45 46 #define FAVOUR_LZO_PERCENT 80 47 48 struct jffs2_compressor { 49 struct list_head list; 50 int priority; /* used by prirority comr. mode */ 51 char *name; 52 char compr; /* JFFS2_COMPR_XXX */ 53 int (*compress)(unsigned char *data_in, unsigned char *cpage_out, 54 uint32_t *srclen, uint32_t *destlen); 55 int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, 56 uint32_t cdatalen, uint32_t datalen); 57 int usecount; 58 int disabled; /* if set the compressor won't compress */ 59 unsigned char *compr_buf; /* used by size compr. mode */ 60 uint32_t compr_buf_size; /* used by size compr. mode */ 61 uint32_t stat_compr_orig_size; 62 uint32_t stat_compr_new_size; 63 uint32_t stat_compr_blocks; 64 uint32_t stat_decompr_blocks; 65 }; 66 67 int jffs2_register_compressor(struct jffs2_compressor *comp); 68 int jffs2_unregister_compressor(struct jffs2_compressor *comp); 69 70 int jffs2_compressors_init(void); 71 int jffs2_compressors_exit(void); 72 73 uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 74 unsigned char *data_in, unsigned char **cpage_out, 75 uint32_t *datalen, uint32_t *cdatalen); 76 77 int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 78 uint16_t comprtype, unsigned char *cdata_in, 79 unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); 80 81 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); 82 83 /* Compressor modules */ 84 /* These functions will be called by jffs2_compressors_init/exit */ 85 86 #ifdef CONFIG_JFFS2_RUBIN 87 int jffs2_rubinmips_init(void); 88 void jffs2_rubinmips_exit(void); 89 int jffs2_dynrubin_init(void); 90 void jffs2_dynrubin_exit(void); 91 #endif 92 #ifdef CONFIG_JFFS2_RTIME 93 int jffs2_rtime_init(void); 94 void jffs2_rtime_exit(void); 95 #endif 96 #ifdef CONFIG_JFFS2_ZLIB 97 int jffs2_zlib_init(void); 98 void jffs2_zlib_exit(void); 99 #endif 100 #ifdef CONFIG_JFFS2_LZO 101 int jffs2_lzo_init(void); 102 void jffs2_lzo_exit(void); 103 #endif 104 105 #endif /* __JFFS2_COMPR_H__ */ 106