11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * JFFS2 -- Journalling Flash File System, Version 2. 31da177e4SLinus Torvalds * 4c00c310eSDavid Woodhouse * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, 51da177e4SLinus Torvalds * University of Szeged, Hungary 61da177e4SLinus Torvalds * 7c00c310eSDavid Woodhouse * For licensing information, see the file 'LICENCE' in this directory. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #ifndef __JFFS2_COMPR_H__ 121da177e4SLinus Torvalds #define __JFFS2_COMPR_H__ 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds #include <linux/kernel.h> 151da177e4SLinus Torvalds #include <linux/vmalloc.h> 161da177e4SLinus Torvalds #include <linux/list.h> 171da177e4SLinus Torvalds #include <linux/types.h> 181da177e4SLinus Torvalds #include <linux/string.h> 191da177e4SLinus Torvalds #include <linux/slab.h> 201da177e4SLinus Torvalds #include <linux/errno.h> 211da177e4SLinus Torvalds #include <linux/fs.h> 221da177e4SLinus Torvalds #include <linux/jffs2.h> 23cbb9a561SDavid Woodhouse #include "jffs2_fs_i.h" 24cbb9a561SDavid Woodhouse #include "jffs2_fs_sb.h" 251da177e4SLinus Torvalds #include "nodelist.h" 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #define JFFS2_RUBINMIPS_PRIORITY 10 281da177e4SLinus Torvalds #define JFFS2_DYNRUBIN_PRIORITY 20 291da177e4SLinus Torvalds #define JFFS2_LZARI_PRIORITY 30 301da177e4SLinus Torvalds #define JFFS2_RTIME_PRIORITY 50 311da177e4SLinus Torvalds #define JFFS2_ZLIB_PRIORITY 60 32c799aca3SRichard Purdie #define JFFS2_LZO_PRIORITY 80 33c799aca3SRichard Purdie 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ 361da177e4SLinus Torvalds #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds #define JFFS2_COMPR_MODE_NONE 0 391da177e4SLinus Torvalds #define JFFS2_COMPR_MODE_PRIORITY 1 401da177e4SLinus Torvalds #define JFFS2_COMPR_MODE_SIZE 2 413b23c1f5SRichard Purdie #define JFFS2_COMPR_MODE_FAVOURLZO 3 423b23c1f5SRichard Purdie 433b23c1f5SRichard Purdie #define FAVOUR_LZO_PERCENT 80 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds struct jffs2_compressor { 461da177e4SLinus Torvalds struct list_head list; 471da177e4SLinus Torvalds int priority; /* used by prirority comr. mode */ 481da177e4SLinus Torvalds char *name; 491da177e4SLinus Torvalds char compr; /* JFFS2_COMPR_XXX */ 501da177e4SLinus Torvalds int (*compress)(unsigned char *data_in, unsigned char *cpage_out, 511da177e4SLinus Torvalds uint32_t *srclen, uint32_t *destlen, void *model); 521da177e4SLinus Torvalds int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, 531da177e4SLinus Torvalds uint32_t cdatalen, uint32_t datalen, void *model); 541da177e4SLinus Torvalds int usecount; 55ef53cb02SDavid Woodhouse int disabled; /* if set the compressor won't compress */ 561da177e4SLinus Torvalds unsigned char *compr_buf; /* used by size compr. mode */ 571da177e4SLinus Torvalds uint32_t compr_buf_size; /* used by size compr. mode */ 581da177e4SLinus Torvalds uint32_t stat_compr_orig_size; 591da177e4SLinus Torvalds uint32_t stat_compr_new_size; 601da177e4SLinus Torvalds uint32_t stat_compr_blocks; 611da177e4SLinus Torvalds uint32_t stat_decompr_blocks; 621da177e4SLinus Torvalds }; 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds int jffs2_register_compressor(struct jffs2_compressor *comp); 651da177e4SLinus Torvalds int jffs2_unregister_compressor(struct jffs2_compressor *comp); 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds int jffs2_compressors_init(void); 681da177e4SLinus Torvalds int jffs2_compressors_exit(void); 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 711da177e4SLinus Torvalds unsigned char *data_in, unsigned char **cpage_out, 721da177e4SLinus Torvalds uint32_t *datalen, uint32_t *cdatalen); 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 751da177e4SLinus Torvalds uint16_t comprtype, unsigned char *cdata_in, 761da177e4SLinus Torvalds unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds /* Compressor modules */ 811da177e4SLinus Torvalds /* These functions will be called by jffs2_compressors_init/exit */ 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds #ifdef CONFIG_JFFS2_RUBIN 841da177e4SLinus Torvalds int jffs2_rubinmips_init(void); 851da177e4SLinus Torvalds void jffs2_rubinmips_exit(void); 861da177e4SLinus Torvalds int jffs2_dynrubin_init(void); 871da177e4SLinus Torvalds void jffs2_dynrubin_exit(void); 881da177e4SLinus Torvalds #endif 891da177e4SLinus Torvalds #ifdef CONFIG_JFFS2_RTIME 901da177e4SLinus Torvalds int jffs2_rtime_init(void); 911da177e4SLinus Torvalds void jffs2_rtime_exit(void); 921da177e4SLinus Torvalds #endif 931da177e4SLinus Torvalds #ifdef CONFIG_JFFS2_ZLIB 941da177e4SLinus Torvalds int jffs2_zlib_init(void); 951da177e4SLinus Torvalds void jffs2_zlib_exit(void); 961da177e4SLinus Torvalds #endif 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds #endif /* __JFFS2_COMPR_H__ */ 99