1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * JFFS2 -- Journalling Flash File System, Version 2. 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, 5*4882a593Smuzhiyun * University of Szeged, Hungary 6*4882a593Smuzhiyun * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> 7*4882a593Smuzhiyun * 8*4882a593Smuzhiyun * For licensing information, see the file 'LICENCE' in this directory. 9*4882a593Smuzhiyun * 10*4882a593Smuzhiyun */ 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #ifndef __JFFS2_COMPR_H__ 13*4882a593Smuzhiyun #define __JFFS2_COMPR_H__ 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun #include <linux/kernel.h> 16*4882a593Smuzhiyun #include <linux/vmalloc.h> 17*4882a593Smuzhiyun #include <linux/list.h> 18*4882a593Smuzhiyun #include <linux/types.h> 19*4882a593Smuzhiyun #include <linux/string.h> 20*4882a593Smuzhiyun #include <linux/slab.h> 21*4882a593Smuzhiyun #include <linux/errno.h> 22*4882a593Smuzhiyun #include <linux/fs.h> 23*4882a593Smuzhiyun #include <linux/jffs2.h> 24*4882a593Smuzhiyun #include "jffs2_fs_i.h" 25*4882a593Smuzhiyun #include "jffs2_fs_sb.h" 26*4882a593Smuzhiyun #include "nodelist.h" 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun #define JFFS2_RUBINMIPS_PRIORITY 10 29*4882a593Smuzhiyun #define JFFS2_DYNRUBIN_PRIORITY 20 30*4882a593Smuzhiyun #define JFFS2_LZARI_PRIORITY 30 31*4882a593Smuzhiyun #define JFFS2_RTIME_PRIORITY 50 32*4882a593Smuzhiyun #define JFFS2_ZLIB_PRIORITY 60 33*4882a593Smuzhiyun #define JFFS2_LZO_PRIORITY 80 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ 37*4882a593Smuzhiyun #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun #define JFFS2_COMPR_MODE_NONE 0 40*4882a593Smuzhiyun #define JFFS2_COMPR_MODE_PRIORITY 1 41*4882a593Smuzhiyun #define JFFS2_COMPR_MODE_SIZE 2 42*4882a593Smuzhiyun #define JFFS2_COMPR_MODE_FAVOURLZO 3 43*4882a593Smuzhiyun #define JFFS2_COMPR_MODE_FORCELZO 4 44*4882a593Smuzhiyun #define JFFS2_COMPR_MODE_FORCEZLIB 5 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun #define FAVOUR_LZO_PERCENT 80 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun struct jffs2_compressor { 49*4882a593Smuzhiyun struct list_head list; 50*4882a593Smuzhiyun int priority; /* used by prirority comr. mode */ 51*4882a593Smuzhiyun char *name; 52*4882a593Smuzhiyun char compr; /* JFFS2_COMPR_XXX */ 53*4882a593Smuzhiyun int (*compress)(unsigned char *data_in, unsigned char *cpage_out, 54*4882a593Smuzhiyun uint32_t *srclen, uint32_t *destlen); 55*4882a593Smuzhiyun int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, 56*4882a593Smuzhiyun uint32_t cdatalen, uint32_t datalen); 57*4882a593Smuzhiyun int usecount; 58*4882a593Smuzhiyun int disabled; /* if set the compressor won't compress */ 59*4882a593Smuzhiyun unsigned char *compr_buf; /* used by size compr. mode */ 60*4882a593Smuzhiyun uint32_t compr_buf_size; /* used by size compr. mode */ 61*4882a593Smuzhiyun uint32_t stat_compr_orig_size; 62*4882a593Smuzhiyun uint32_t stat_compr_new_size; 63*4882a593Smuzhiyun uint32_t stat_compr_blocks; 64*4882a593Smuzhiyun uint32_t stat_decompr_blocks; 65*4882a593Smuzhiyun }; 66*4882a593Smuzhiyun 67*4882a593Smuzhiyun int jffs2_register_compressor(struct jffs2_compressor *comp); 68*4882a593Smuzhiyun int jffs2_unregister_compressor(struct jffs2_compressor *comp); 69*4882a593Smuzhiyun 70*4882a593Smuzhiyun int jffs2_compressors_init(void); 71*4882a593Smuzhiyun int jffs2_compressors_exit(void); 72*4882a593Smuzhiyun 73*4882a593Smuzhiyun uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 74*4882a593Smuzhiyun unsigned char *data_in, unsigned char **cpage_out, 75*4882a593Smuzhiyun uint32_t *datalen, uint32_t *cdatalen); 76*4882a593Smuzhiyun 77*4882a593Smuzhiyun int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 78*4882a593Smuzhiyun uint16_t comprtype, unsigned char *cdata_in, 79*4882a593Smuzhiyun unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); 82*4882a593Smuzhiyun 83*4882a593Smuzhiyun /* Compressor modules */ 84*4882a593Smuzhiyun /* These functions will be called by jffs2_compressors_init/exit */ 85*4882a593Smuzhiyun 86*4882a593Smuzhiyun #ifdef CONFIG_JFFS2_RUBIN 87*4882a593Smuzhiyun int jffs2_rubinmips_init(void); 88*4882a593Smuzhiyun void jffs2_rubinmips_exit(void); 89*4882a593Smuzhiyun int jffs2_dynrubin_init(void); 90*4882a593Smuzhiyun void jffs2_dynrubin_exit(void); 91*4882a593Smuzhiyun #endif 92*4882a593Smuzhiyun #ifdef CONFIG_JFFS2_RTIME 93*4882a593Smuzhiyun int jffs2_rtime_init(void); 94*4882a593Smuzhiyun void jffs2_rtime_exit(void); 95*4882a593Smuzhiyun #endif 96*4882a593Smuzhiyun #ifdef CONFIG_JFFS2_ZLIB 97*4882a593Smuzhiyun int jffs2_zlib_init(void); 98*4882a593Smuzhiyun void jffs2_zlib_exit(void); 99*4882a593Smuzhiyun #endif 100*4882a593Smuzhiyun #ifdef CONFIG_JFFS2_LZO 101*4882a593Smuzhiyun int jffs2_lzo_init(void); 102*4882a593Smuzhiyun void jffs2_lzo_exit(void); 103*4882a593Smuzhiyun #endif 104*4882a593Smuzhiyun 105*4882a593Smuzhiyun #endif /* __JFFS2_COMPR_H__ */ 106