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void chat(char*, ...);
Xfile * clean(Xfile*);
void dirdump(void*);
int dosfs(Xfs*);
int emptydir(Xfile*);
int falloc(Xfs*);
int fileaddr(Xfile*, int, int);
int getfat(Xfs*, int);
int getfile(Xfile*);
Xfs * getxfs(char*);
void panic(char*, ...);
void putfat(Xfs*, int, int);
void putfile(Xfile*);
void refxfs(Xfs*, int);
long writefile(Xfile*, void*, vlong, long);
char * xerrstr(int);
Xfile * xfile(Fid*, int);
int xfspurge(void);
int ext2fs(Xfs *);
int get_inode( Xfile *, uint);
char *getname(Xfile *, char *);
int get_file(Xfile *, char *);
int bmap( Xfile *f, int block );
int ffz(int);
long readdir(Xfile*, void*, vlong, long);
long readfile(Xfile*, void*, vlong, long);
void dostat(Qid, Xfile *, Dir *);
int new_block( Xfile *, int);
int test_bit(int, void *);
int set_bit(int, void *);
int clear_bit(int , void *);
void *memscan(void *, int, int);
int find_first_zero_bit(void *, int);
int find_next_zero_bit(void *, int, int);
int block_getblk(Xfile *, int, int);
int inode_getblk(Xfile *, int);
int getblk(Xfile *, int);
int new_inode(Xfile *, int);
int add_entry(Xfile *, char *, int);
int create_file(Xfile *, char *, int);
int create_dir(Xfile *, char *, int);
int unlink(Xfile *);
int delete_entry(Xfs *, Inode *, int);
int free_block_inode(Xfile *);
void free_block( Xfs *, ulong);
void free_inode( Xfs *, int);
int empty_dir(Xfile *);
int truncfile(Xfile *);
int dowstat(Xfile *, Dir *);
long getmode(Xfile *);
Ext2 getext2(Xfs *, char, int);
void CleanSuper(Xfs *);
/* Iobuf operations */
Iobuf *getbuf(Xfs *, long addr);
void putbuf(Iobuf *);
void purgebuf(Xfs *);
void iobuf_init(void);
int xread(Xfs *, Iobuf *, long);
void syncbuf(void);
void xwrite(Iobuf *);
void dirtybuf(Iobuf *);
void mchat(char *fmt, ...);
void dumpbuf(void);
void gidfile(char*);
void uidfile(char*);
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