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Diffstat (limited to 'fs/jffs2/compr.h')
| -rw-r--r-- | fs/jffs2/compr.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/fs/jffs2/compr.h b/fs/jffs2/compr.h new file mode 100644 index 000000000..5e91d578f --- /dev/null +++ b/fs/jffs2/compr.h @@ -0,0 +1,105 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, + * University of Szeged, Hungary + * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> + * + * For licensing information, see the file 'LICENCE' in this directory. + * + */ + +#ifndef __JFFS2_COMPR_H__ +#define __JFFS2_COMPR_H__ + +#include <linux/kernel.h> +#include <linux/vmalloc.h> +#include <linux/list.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/jffs2.h> +#include "jffs2_fs_i.h" +#include "jffs2_fs_sb.h" +#include "nodelist.h" + +#define JFFS2_RUBINMIPS_PRIORITY 10 +#define JFFS2_DYNRUBIN_PRIORITY 20 +#define JFFS2_LZARI_PRIORITY 30 +#define JFFS2_RTIME_PRIORITY 50 +#define JFFS2_ZLIB_PRIORITY 60 +#define JFFS2_LZO_PRIORITY 80 + + +#define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ +#define JFFS2_DYNRUBIN_DISABLED /* for decompression */ + +#define JFFS2_COMPR_MODE_NONE 0 +#define JFFS2_COMPR_MODE_PRIORITY 1 +#define JFFS2_COMPR_MODE_SIZE 2 +#define JFFS2_COMPR_MODE_FAVOURLZO 3 +#define JFFS2_COMPR_MODE_FORCELZO 4 +#define JFFS2_COMPR_MODE_FORCEZLIB 5 + +#define FAVOUR_LZO_PERCENT 80 + +struct jffs2_compressor { + struct list_head list; + int priority; /* used by prirority comr. mode */ + char *name; + char compr; /* JFFS2_COMPR_XXX */ + int (*compress)(unsigned char *data_in, unsigned char *cpage_out, + uint32_t *srclen, uint32_t *destlen); + int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, + uint32_t cdatalen, uint32_t datalen); + int usecount; + int disabled; /* if set the compressor won't compress */ + unsigned char *compr_buf; /* used by size compr. mode */ + uint32_t compr_buf_size; /* used by size compr. mode */ + uint32_t stat_compr_orig_size; + uint32_t stat_compr_new_size; + uint32_t stat_compr_blocks; + uint32_t stat_decompr_blocks; +}; + +int jffs2_register_compressor(struct jffs2_compressor *comp); +int jffs2_unregister_compressor(struct jffs2_compressor *comp); + +int jffs2_compressors_init(void); +int jffs2_compressors_exit(void); + +uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + unsigned char *data_in, unsigned char **cpage_out, + uint32_t *datalen, uint32_t *cdatalen); + +int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + uint16_t comprtype, unsigned char *cdata_in, + unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); + +void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); + +/* Compressor modules */ +/* These functions will be called by jffs2_compressors_init/exit */ + +#ifdef CONFIG_JFFS2_RUBIN +int jffs2_rubinmips_init(void); +void jffs2_rubinmips_exit(void); +int jffs2_dynrubin_init(void); +void jffs2_dynrubin_exit(void); +#endif +#ifdef CONFIG_JFFS2_RTIME +int jffs2_rtime_init(void); +void jffs2_rtime_exit(void); +#endif +#ifdef CONFIG_JFFS2_ZLIB +int jffs2_zlib_init(void); +void jffs2_zlib_exit(void); +#endif +#ifdef CONFIG_JFFS2_LZO +int jffs2_lzo_init(void); +void jffs2_lzo_exit(void); +#endif + +#endif /* __JFFS2_COMPR_H__ */ |