fs/jffs2/compr.h

Source file repositories/reference/linux-study-clean/fs/jffs2/compr.h

File Facts

System
Linux kernel
Corpus path
fs/jffs2/compr.h
Extension
.h
Size
3713 bytes
Lines
120
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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);
#else
static inline int jffs2_rubinmips_init(void) { return 0; }
static inline void jffs2_rubinmips_exit(void) {}
static inline int jffs2_dynrubin_init(void) { return 0; }
static inline void jffs2_dynrubin_exit(void) {}
#endif
#ifdef CONFIG_JFFS2_RTIME
extern int jffs2_rtime_init(void);
extern void jffs2_rtime_exit(void);
#else
static inline int jffs2_rtime_init(void) { return 0; }
static inline void jffs2_rtime_exit(void) {}
#endif
#ifdef CONFIG_JFFS2_ZLIB
extern int jffs2_zlib_init(void);
extern void jffs2_zlib_exit(void);
#else
static inline int jffs2_zlib_init(void) { return 0; }
static inline void jffs2_zlib_exit(void) {}
#endif
#ifdef CONFIG_JFFS2_LZO
extern int jffs2_lzo_init(void);
extern void jffs2_lzo_exit(void);
#else
static inline int jffs2_lzo_init(void) { return 0; }
static inline void jffs2_lzo_exit(void) {}
#endif

#endif /* __JFFS2_COMPR_H__ */

Annotation

Implementation Notes