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 66088c058SDavid Woodhouse * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> 71da177e4SLinus Torvalds * 8c00c310eSDavid Woodhouse * For licensing information, see the file 'LICENCE' in this directory. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #ifndef __JFFS2_COMPR_H__ 131da177e4SLinus Torvalds #define __JFFS2_COMPR_H__ 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds #include <linux/kernel.h> 161da177e4SLinus Torvalds #include <linux/vmalloc.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/types.h> 191da177e4SLinus Torvalds #include <linux/string.h> 201da177e4SLinus Torvalds #include <linux/slab.h> 211da177e4SLinus Torvalds #include <linux/errno.h> 221da177e4SLinus Torvalds #include <linux/fs.h> 231da177e4SLinus Torvalds #include <linux/jffs2.h> 24cbb9a561SDavid Woodhouse #include "jffs2_fs_i.h" 25cbb9a561SDavid Woodhouse #include "jffs2_fs_sb.h" 261da177e4SLinus Torvalds #include "nodelist.h" 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #define JFFS2_RUBINMIPS_PRIORITY 10 291da177e4SLinus Torvalds #define JFFS2_DYNRUBIN_PRIORITY 20 301da177e4SLinus Torvalds #define JFFS2_LZARI_PRIORITY 30 311da177e4SLinus Torvalds #define JFFS2_RTIME_PRIORITY 50 321da177e4SLinus Torvalds #define JFFS2_ZLIB_PRIORITY 60 33c799aca3SRichard Purdie #define JFFS2_LZO_PRIORITY 80 34c799aca3SRichard Purdie 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ 371da177e4SLinus Torvalds #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #define JFFS2_COMPR_MODE_NONE 0 401da177e4SLinus Torvalds #define JFFS2_COMPR_MODE_PRIORITY 1 411da177e4SLinus Torvalds #define JFFS2_COMPR_MODE_SIZE 2 423b23c1f5SRichard Purdie #define JFFS2_COMPR_MODE_FAVOURLZO 3 433b23c1f5SRichard Purdie 443b23c1f5SRichard Purdie #define FAVOUR_LZO_PERCENT 80 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds struct jffs2_compressor { 471da177e4SLinus Torvalds struct list_head list; 481da177e4SLinus Torvalds int priority; /* used by prirority comr. mode */ 491da177e4SLinus Torvalds char *name; 501da177e4SLinus Torvalds char compr; /* JFFS2_COMPR_XXX */ 511da177e4SLinus Torvalds int (*compress)(unsigned char *data_in, unsigned char *cpage_out, 52088bd455SMike Frysinger uint32_t *srclen, uint32_t *destlen); 531da177e4SLinus Torvalds int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, 54088bd455SMike Frysinger uint32_t cdatalen, uint32_t datalen); 551da177e4SLinus Torvalds int usecount; 56ef53cb02SDavid Woodhouse int disabled; /* if set the compressor won't compress */ 571da177e4SLinus Torvalds unsigned char *compr_buf; /* used by size compr. mode */ 581da177e4SLinus Torvalds uint32_t compr_buf_size; /* used by size compr. mode */ 591da177e4SLinus Torvalds uint32_t stat_compr_orig_size; 601da177e4SLinus Torvalds uint32_t stat_compr_new_size; 611da177e4SLinus Torvalds uint32_t stat_compr_blocks; 621da177e4SLinus Torvalds uint32_t stat_decompr_blocks; 631da177e4SLinus Torvalds }; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds int jffs2_register_compressor(struct jffs2_compressor *comp); 661da177e4SLinus Torvalds int jffs2_unregister_compressor(struct jffs2_compressor *comp); 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds int jffs2_compressors_init(void); 691da177e4SLinus Torvalds int jffs2_compressors_exit(void); 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 721da177e4SLinus Torvalds unsigned char *data_in, unsigned char **cpage_out, 731da177e4SLinus Torvalds uint32_t *datalen, uint32_t *cdatalen); 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 761da177e4SLinus Torvalds uint16_t comprtype, unsigned char *cdata_in, 771da177e4SLinus Torvalds unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds /* Compressor modules */ 821da177e4SLinus Torvalds /* These functions will be called by jffs2_compressors_init/exit */ 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds #ifdef CONFIG_JFFS2_RUBIN 851da177e4SLinus Torvalds int jffs2_rubinmips_init(void); 861da177e4SLinus Torvalds void jffs2_rubinmips_exit(void); 871da177e4SLinus Torvalds int jffs2_dynrubin_init(void); 881da177e4SLinus Torvalds void jffs2_dynrubin_exit(void); 891da177e4SLinus Torvalds #endif 901da177e4SLinus Torvalds #ifdef CONFIG_JFFS2_RTIME 911da177e4SLinus Torvalds int jffs2_rtime_init(void); 921da177e4SLinus Torvalds void jffs2_rtime_exit(void); 931da177e4SLinus Torvalds #endif 941da177e4SLinus Torvalds #ifdef CONFIG_JFFS2_ZLIB 951da177e4SLinus Torvalds int jffs2_zlib_init(void); 961da177e4SLinus Torvalds void jffs2_zlib_exit(void); 971da177e4SLinus Torvalds #endif 980fc72b81SDavid Woodhouse #ifdef CONFIG_JFFS2_LZO 990fc72b81SDavid Woodhouse int jffs2_lzo_init(void); 1000fc72b81SDavid Woodhouse void jffs2_lzo_exit(void); 1010fc72b81SDavid Woodhouse #endif 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds #endif /* __JFFS2_COMPR_H__ */ 104