3b23c1f5fa
Add a "favourlzo" compression mode to jffs2 which tries to optimise by size but gives lzo an advantage when comparing sizes. This means the faster lzo algorithm can be preferred when there isn't much difference in compressed size (the exact threshold can be changed). Signed-off-by: Richard Purdie <rpurdie@openedhand.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
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* University of Szeged, Hungary
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#ifndef __JFFS2_COMPR_H__
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#define __JFFS2_COMPR_H__
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#include <linux/kernel.h>
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#include <linux/vmalloc.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/jffs2.h>
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#include "jffs2_fs_i.h"
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#include "jffs2_fs_sb.h"
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#include "nodelist.h"
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#define JFFS2_RUBINMIPS_PRIORITY 10
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#define JFFS2_DYNRUBIN_PRIORITY 20
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#define JFFS2_LZARI_PRIORITY 30
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#define JFFS2_RTIME_PRIORITY 50
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#define JFFS2_ZLIB_PRIORITY 60
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#define JFFS2_LZO_PRIORITY 80
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#define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
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#define JFFS2_DYNRUBIN_DISABLED /* for decompression */
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#define JFFS2_COMPR_MODE_NONE 0
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#define JFFS2_COMPR_MODE_PRIORITY 1
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#define JFFS2_COMPR_MODE_SIZE 2
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#define JFFS2_COMPR_MODE_FAVOURLZO 3
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#define FAVOUR_LZO_PERCENT 80
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struct jffs2_compressor {
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struct list_head list;
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int priority; /* used by prirority comr. mode */
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char *name;
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char compr; /* JFFS2_COMPR_XXX */
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int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
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uint32_t *srclen, uint32_t *destlen, void *model);
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int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
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uint32_t cdatalen, uint32_t datalen, void *model);
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int usecount;
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int disabled; /* if set the compressor won't compress */
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unsigned char *compr_buf; /* used by size compr. mode */
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uint32_t compr_buf_size; /* used by size compr. mode */
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uint32_t stat_compr_orig_size;
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uint32_t stat_compr_new_size;
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uint32_t stat_compr_blocks;
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uint32_t stat_decompr_blocks;
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};
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int jffs2_register_compressor(struct jffs2_compressor *comp);
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int jffs2_unregister_compressor(struct jffs2_compressor *comp);
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int jffs2_compressors_init(void);
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int jffs2_compressors_exit(void);
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uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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unsigned char *data_in, unsigned char **cpage_out,
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uint32_t *datalen, uint32_t *cdatalen);
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int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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uint16_t comprtype, unsigned char *cdata_in,
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unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
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void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
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/* Compressor modules */
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/* These functions will be called by jffs2_compressors_init/exit */
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#ifdef CONFIG_JFFS2_RUBIN
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int jffs2_rubinmips_init(void);
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void jffs2_rubinmips_exit(void);
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int jffs2_dynrubin_init(void);
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void jffs2_dynrubin_exit(void);
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#endif
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#ifdef CONFIG_JFFS2_RTIME
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int jffs2_rtime_init(void);
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void jffs2_rtime_exit(void);
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#endif
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#ifdef CONFIG_JFFS2_ZLIB
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int jffs2_zlib_init(void);
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void jffs2_zlib_exit(void);
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#endif
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#endif /* __JFFS2_COMPR_H__ */
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