Vac: module {	PATH:	con "/dis/lib/vac.dis";	init:	fn(); 	dflag:	int; 	# taken from venti.m, merge back later	# some of this needs to be removed from venti.m since it does not belong there 	# mode bits	Modeperm: con 8r777;	Modesticky,	Modesetuid,	Modesetgid,	Modeappend,	Modeexcl,	Modesymlink,	Modedir,	Modehidden,	Modesystem,	Modearchive,	Modetemp,	Modesnapshot,	Modedev,	Modenamedpipe: con 1<<(9+iota); 	Entrysize:	con 40;	Rootsize:	con 300;	Metablocksize:	con 12;	Metaentrysize:	con 4; 	Dsize:	con 8*1024; 	Entryactive:	con (1<<0);	# entry is in use	Entrydir:	con (1<<1);	# a directory	Entrydepthshift:	con 2;	# shift for pointer depth	Entrydepthmask:	con (16r7<<2);	# mask for pointer depth	Entrylocal:	con (1<<5);	# used for local storage: should not be set for venti blocks 	Root: adt {		version:	int;		name:	string;		rtype:	string;		score:	Venti->Score;		# to a Dir block		blocksize:	int;				# maximum block size		prev:		ref Venti->Score;		# last root block 		new:	fn(name, rtype: string, score: Venti->Score, blocksize: int, prev: ref Venti->Score): ref Root;		unpack:	fn(d: array of byte): ref Root;		pack:	fn(r: self ref Root): array of byte;	}; 	Entry: adt {		gen:		int;		# generation number (XXX should be unsigned)		psize:	int;		# pointer block size		dsize:	int;		# data block size		depth:	int;		# unpacked from flags		flags:	int;		size:		big;		# (XXX should be unsigned)		score:	Venti->Score; 		new:	fn(psize, dsize, flags: int, size: big, score: Venti->Score): ref Entry;		pack:	fn(e: self ref Entry): array of byte;		unpack:	fn(d: array of byte): ref Entry;	}; 	Direntry: adt {		version:	int;		elem:	string;		entry, gen:	int;		mentry, mgen:	int;		qid:	big;		uid, gid, mid:	string;		mtime, mcount, ctime, atime, mode, emode: int; 		new:	fn(): ref Direntry;		mk:	fn(d: Sys->Dir): ref Direntry;		mkdir:	fn(de: self ref Direntry): ref Sys->Dir;		pack:	fn(de: self ref Direntry): array of byte;		unpack:	fn(d: array of byte): ref Direntry;	}; 	Metablock: adt {		size, free, maxindex, nindex:	int; 		new:	fn(): ref Metablock;		pack:	fn(mb: self ref Metablock, d: array of byte);		unpack:	fn(d: array of byte): ref Metablock;	}; 	Metaentry: adt {		offset, size:	int; 		pack:	fn(me: self ref Metaentry, d: array of byte);		unpack:	fn(d: array of byte, i: int): ref Metaentry;	}; 	# single block	Page: adt {		d:	array of byte;		o:	int; 		new:	fn(dsize: int): ref Page;		add:	fn(p: self ref Page, s: Venti->Score);		full:	fn(p: self ref Page): int;		data:	fn(p: self ref Page): array of byte;	}; 	# hash tree file	File: adt {		p:	array of ref Page;		dtype, dsize:	int;		size:	big;		s:	ref Venti->Session; 		new:	fn(s: ref Venti->Session, dtype, dsize: int): ref File;		write:	fn(f: self ref File, d: array of byte): int;		finish:	fn(f: self ref File): ref Entry;	}; 	# for writing venti directories	Sink: adt {		f:	ref File;		d:	array of byte;		nd, ne:	int; 		new:	fn(s: ref Venti->Session, dsize: int): ref Sink;		add:	fn(m: self ref Sink, e: ref Entry): int;		finish:	fn(m: self ref Sink): ref Entry;	}; 	Mentry: adt {		elem:	string;		me:	ref Metaentry; 		cmp:	fn(a, b: ref Mentry): int;	}; 	# for writing directory entries (meta blocks, meta entries, direntries)	MSink: adt {		f: 	ref File;		de:	array of byte;		nde:	int;		l:	list of ref Mentry; 		new:	fn(s: ref Venti->Session, dsize: int): ref MSink;		add:	fn(m: self ref MSink, de: ref Direntry): int;		finish:	fn(m: self ref MSink): ref Entry;	}; 	# for reading pages from a hash tree referenced by an entry	Source: adt {		session:	ref Venti->Session;		e:	ref Entry; 		new:	fn(s: ref Venti->Session, e: ref Entry): ref Source;		get:	fn(s: self ref Source, i: big, d: array of byte): int;	}; 	# for reading from a hash tree while keeping offset	Vacfile: adt {		s:	ref Source;		o:	big; 		mk:	fn(s: ref Source): ref Vacfile;		new:	fn(session: ref Venti->Session, e: ref Entry): ref Vacfile;		read:	fn(v: self ref Vacfile, d: array of byte, n: int): int;		seek:	fn(v: self ref Vacfile, offset: big): big;		pread:	fn(v: self ref Vacfile, d: array of byte, n: int, offset: big): int;	}; 	# for listing contents of a vac directory and walking to path elements	Vacdir: adt {		vf:	ref Vacfile;		ms:	ref Source;		p:	big;		i:	int; 		mk:	fn(vf: ref Vacfile, ms: ref Source): ref Vacdir;		new:	fn(session: ref Venti->Session, e, me: ref Entry): ref Vacdir;		walk:	fn(v: self ref Vacdir, elem: string): ref Direntry;		open:	fn(v: self ref Vacdir, de: ref Direntry): (ref Entry, ref Entry);		readdir:	fn(v: self ref Vacdir): (int, ref Direntry);		rewind:		fn(v: self ref Vacdir);	}; 	vdroot:	fn(session: ref Venti->Session, score: Venti->Score): (ref Vacdir, ref Direntry, string);};