120 строки
3.6 KiB
C
120 строки
3.6 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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* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
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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 JFFS2_COMPR_MODE_FORCELZO 4
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#define JFFS2_COMPR_MODE_FORCEZLIB 5
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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);
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int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
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uint32_t cdatalen, uint32_t datalen);
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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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#else
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static inline int jffs2_rubinmips_init(void) { return 0; }
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static inline void jffs2_rubinmips_exit(void) {}
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static inline int jffs2_dynrubin_init(void) { return 0; }
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static inline void jffs2_dynrubin_exit(void) {}
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#endif
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#ifdef CONFIG_JFFS2_RTIME
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extern int jffs2_rtime_init(void);
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extern void jffs2_rtime_exit(void);
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#else
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static inline int jffs2_rtime_init(void) { return 0; }
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static inline void jffs2_rtime_exit(void) {}
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#endif
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#ifdef CONFIG_JFFS2_ZLIB
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extern int jffs2_zlib_init(void);
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extern void jffs2_zlib_exit(void);
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#else
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static inline int jffs2_zlib_init(void) { return 0; }
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static inline void jffs2_zlib_exit(void) {}
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#endif
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#ifdef CONFIG_JFFS2_LZO
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extern int jffs2_lzo_init(void);
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extern void jffs2_lzo_exit(void);
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#else
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static inline int jffs2_lzo_init(void) { return 0; }
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static inline void jffs2_lzo_exit(void) {}
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#endif
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#endif /* __JFFS2_COMPR_H__ */
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