1 #include <u.h>
2 #include <sys/stat.h>
3 #include "stdinc.h"
4 #include "vac.h"
5 #include "dat.h"
6 #include "fns.h"
7 
8 int mainstacksize = 128*1024;
9 
10 typedef struct Sink Sink;
11 typedef struct MetaSink MetaSink;
12 typedef struct DirSink DirSink;
13 
14 struct Sink {
15 	VtConn *z;
16 	VtEntry dir;
17 	uchar *buf;
18 	uchar *pbuf[VtPointerDepth+1];
19 };
20 
21 struct DirSink {
22 	Sink *sink;
23 	MetaSink *msink;
24 	ulong nentry;
25 	uchar *buf;
26 	uchar *p;	/* current pointer */
27 	uchar *ep;	/* end pointer */
28 };
29 
30 struct MetaSink {
31 	Sink *sink;
32 	uchar *buf;
33 	int maxindex;
34 	int nindex;
35 	uchar *rp;	/* start of current record */
36 	uchar *p;	/* current pointer */
37 	uchar *ep;	/* end pointer */
38 };
39 
40 static void usage(void);
41 static int strpcmp(const void*, const void*);
42 static void warn(char *fmt, ...);
43 static void cleanup(void);
44 static u64int unittoull(char *s);
45 static void vac(VtConn *z, char *argv[]);
46 static void vacfile(DirSink *dsink, char *lname, char *sname, VacFile*);
47 static void vacstdin(DirSink *dsink, char *name, VacFile *vf);
48 static void vacdata(DirSink *dsink, int fd, char *lname, VacFile*, Dir*);
49 static void vacdir(DirSink *dsink, int fd, char *lname, char *sname, VacFile*);
50 static int vacmerge(DirSink *dsink, char *lname, char *sname);
51 
52 Sink *sinkalloc(VtConn *z, int psize, int dsize);
53 void sinkwrite(Sink *k, uchar *data, int n);
54 void sinkwritescore(Sink *k, uchar *score, int n);
55 void sinkclose(Sink *k);
56 void sinkfree(Sink *k);
57 
58 DirSink *dirsinkalloc(VtConn *z, int psize, int dsize);
59 void dirsinkwrite(DirSink *k, VtEntry*);
60 void dirsinkwritesink(DirSink *k, Sink*);
61 int dirsinkwritefile(DirSink *k, VacFile *vf);
62 void dirsinkclose(DirSink *k);
63 void dirsinkfree(DirSink *k);
64 
65 MetaSink *metasinkalloc(VtConn *z, int psize, int dsize);
66 void metasinkputc(MetaSink *k, int c);
67 void metasinkputstring(MetaSink *k, char *s);
68 void metasinkputuint32(MetaSink *k, ulong x);
69 void metasinkputuint64(MetaSink *k, uvlong x);
70 void metasinkwrite(MetaSink *k, uchar *data, int n);
71 void metasinkwritedir(MetaSink *ms, VacDir *vd);
72 void metasinkeor(MetaSink *k);
73 void metasinkclose(MetaSink *k);
74 void metasinkfree(MetaSink *k);
75 void plan9tovacdir(VacDir*, Dir*, ulong entry, uvlong qid);
76 
77 enum {
78 	Version = 8,
79 	BlockSize = 8*1024,
80 	MaxExclude = 1000,
81 };
82 
83 struct {
84 	ulong	file;
85 	ulong	sfile;
86 	ulong	data;
87 	ulong	sdata;
88 	ulong	skip;
89 	ulong	meta;
90 } stats;
91 
92 int bsize = BlockSize;
93 int maxbsize;
94 char *oname, *dfile;
95 int verbose;
96 uvlong fileid = 1;
97 int qdiff;
98 char *exclude[MaxExclude];
99 int nexclude;
100 int nowrite;
101 int merge;
102 char *isi;
103 
104 static void
105 usage(void)
106 {
107 	fprint(2, "usage: %s [-amqsv] [-h host] [-d vacfile] [-b blocksize] [-i name] [-e exclude] [-f vacfile] file ... \n", argv0);
108 	exits("usage");
109 }
110 
111 void
112 threadmain(int argc, char *argv[])
113 {
114 	VtConn *z;
115 	char *p;
116 	char *host = nil;
117 	int statsflag = 0;
118 
119 	atexit(cleanup);
120 
121 	ARGBEGIN{
122 	default:
123 		usage();
124 	case 'b':
125 		p = ARGF();
126 		if(p == 0)
127 			usage();
128 		bsize = unittoull(p);
129 		if(bsize == ~0)
130 			usage();
131 		break;
132 	case 'd':
133 		dfile = ARGF();
134 		if(dfile == nil)
135 			usage();
136 		break;
137 	case 'e':
138 		if(nexclude >= MaxExclude)
139 			sysfatal("too many exclusions\n");
140 		exclude[nexclude] = ARGF();
141 		if(exclude[nexclude] == nil)
142 			usage();
143 		nexclude++;
144 		break;
145 	case 'f':
146 		oname = ARGF();
147 		if(oname == 0)
148 			usage();
149 		break;
150 	case 'h':
151 		host = ARGF();
152 		if(host == nil)
153 			usage();
154 		break;
155 	case 'i':
156 		isi = ARGF();
157 		if(isi == nil)
158 			usage();
159 		break;
160 	case 'n':
161 		nowrite++;
162 		break;
163 	case 'm':
164 		merge++;
165 		break;
166 	case 'q':
167 		qdiff++;
168 		break;
169 	case 's':
170 		statsflag++;
171 		break;
172 	case 'v':
173 		verbose++;
174 		break;
175 	}ARGEND;
176 
177 	if(argc == 0)
178 		usage();
179 
180 	if(bsize < 512)
181 		bsize = 512;
182 	if(bsize > VtMaxLumpSize)
183 		bsize = VtMaxLumpSize;
184 	maxbsize = bsize;
185 
186 	fmtinstall('V', vtscorefmt);
187 
188 	z = vtdial(host);
189 	if(z == nil)
190 		sysfatal("could not connect to server: %r");
191 
192 	if(vtconnect(z) < 0)
193 		sysfatal("vtconnect: %r");
194 
195 	qsort(exclude, nexclude, sizeof(char*), strpcmp);
196 
197 	vac(z, argv);
198 
199 	if(vtsync(z) < 0)
200 		fprint(2, "warning: could not ask server to flush pending writes: %r\n");
201 
202 	if(statsflag)
203 		fprint(2, "files %ld:%ld data %ld:%ld:%ld meta %ld\n", stats.file, stats.sfile,
204 			stats.data, stats.skip, stats.sdata, stats.meta);
205 //packetStats();
206 	vthangup(z);
207 
208 	threadexitsall(0);
209 }
210 
211 static int
212 strpcmp(const void *p0, const void *p1)
213 {
214 	return strcmp(*(char**)p0, *(char**)p1);
215 }
216 
217 int
218 vacwrite(VtConn *z, uchar score[VtScoreSize], int type, uchar *buf, int n)
219 {
220 	assert(n > 0);
221 	if(nowrite){
222 		sha1(buf, n, score, nil);
223 		return 0;
224 	}
225 	return vtwrite(z, score, type, buf, n);
226 }
227 
228 static char*
229 lastelem(char *oname)
230 {
231 	char *p;
232 
233 	if(oname == nil)
234 		abort();
235 	if((p = strrchr(oname, '/')) == nil)
236 		return oname;
237 	return p+1;
238 }
239 
240 static void
241 vac(VtConn *z, char *argv[])
242 {
243 	DirSink *dsink, *ds;
244 	MetaSink *ms;
245 	VtRoot root;
246 	uchar score[VtScoreSize], buf[VtRootSize];
247 	char cwd[2048];
248 	int cd;
249 	char *cp2, *cp;
250 	VacFs *fs;
251 	VacFile *vff;
252 	int fd;
253 	Dir *dir;
254 	VacDir vd;
255 
256 	if(getwd(cwd, sizeof(cwd)) == 0)
257 		sysfatal("can't find current directory: %r\n");
258 
259 	dsink = dirsinkalloc(z, bsize, bsize);
260 
261 	fs = nil;
262 	if(dfile != nil) {
263 		fs = vacfsopen(z, dfile, VtOREAD, 1000);
264 		if(fs == nil)
265 			fprint(2, "could not open diff: %s: %r\n", dfile);
266 	}
267 		
268 
269 	if(oname != nil) {
270 		fd = create(oname, OWRITE, 0666);
271 		if(fd < 0)
272 			sysfatal("could not create file: %s: %r", oname);
273 	} else 
274 		fd = 1;
275 
276 	dir = dirfstat(fd);
277 	if(dir == nil)
278 		sysfatal("dirfstat failed: %r");
279 	if(oname)
280 		dir->name = lastelem(oname);
281 	else
282 		dir->name = "stdin";
283 
284 	for(; *argv; argv++) {
285 		cp2 = *argv;
286 		cd = 0;
287 		for (cp = *argv; *cp; cp++)
288 			if (*cp == '/')
289 				cp2 = cp;
290 		if (cp2 != *argv) {
291 			*cp2 = '\0';
292 			chdir(*argv);
293 			*cp2 = '/';
294 			cp2++;
295 			cd = 1;
296 		}
297 		vff = nil;
298 		if(fs)
299 			vff = vacfileopen(fs, cp2);
300 		vacfile(dsink, argv[0], cp2, vff);
301 		if(vff)
302 			vacfiledecref(vff);
303 		if(cd && chdir(cwd) < 0)
304 			sysfatal("can't cd back to %s: %r\n", cwd);
305 	}
306 	
307 	if(isi) {
308 		vff = nil;
309 		if(fs)
310 			vff = vacfileopen(fs, isi);
311 		vacstdin(dsink, isi, vff);
312 		if(vff)
313 			vacfiledecref(vff);
314 	}
315 
316 	dirsinkclose(dsink);
317 
318 	/* build meta information for the root */
319 	ms = metasinkalloc(z, bsize, bsize);
320 	/* fake into a directory */
321 	dir->mode |= (dir->mode&0444)>>2;
322 	dir->qid.type |= QTDIR;
323 	dir->mode |= DMDIR;
324 	plan9tovacdir(&vd, dir, 0, fileid++);
325 	if(strcmp(vd.elem, "/") == 0){
326 		vtfree(vd.elem);
327 		vd.elem = vtstrdup("root");
328 	}
329 	metasinkwritedir(ms, &vd);
330 	vdcleanup(&vd);
331 	metasinkclose(ms);
332 	
333 	ds = dirsinkalloc(z, bsize, bsize);
334 	dirsinkwritesink(ds, dsink->sink);
335 	dirsinkwritesink(ds, dsink->msink->sink);
336 	dirsinkwritesink(ds, ms->sink);
337 	dirsinkclose(ds);
338 
339 	memset(&root, 0, sizeof(root));		
340 	strncpy(root.name, dir->name, sizeof(root.name));
341 	root.name[sizeof(root.name)-1] = 0;
342 	free(dir);
343 	sprint(root.type, "vac");
344 	memmove(root.score, ds->sink->dir.score, VtScoreSize);
345 	root.blocksize = maxbsize;
346 	if(fs != nil)
347 		vacfsgetscore(fs, root.prev);
348 
349 	metasinkfree(ms);
350 	dirsinkfree(ds);
351 	dirsinkfree(dsink);
352 	if(fs != nil)
353 		vacfsclose(fs);
354 	
355 	vtrootpack(&root, buf);
356 	if(vacwrite(z, score, VtRootType, buf, VtRootSize) < 0)
357 		sysfatal("vacWrite failed: %r");
358 
359 	fprint(fd, "vac:%V\n", score);
360 
361 	/* avoid remove at cleanup */
362 	oname = nil;
363 }
364 
365 static int
366 isexcluded(char *name)
367 {
368 	int bot, top, i, x;
369 
370 	bot = 0;	
371 	top = nexclude;
372 	while(bot < top) {
373 		i = (bot+top)>>1;
374 		x = strcmp(exclude[i], name);
375 		if(x == 0)
376 			return 1;
377 		if(x < 0)
378 			bot = i + 1;
379 		else /* x > 0 */
380 			top = i;
381 	}
382 	return 0;
383 }
384 
385 static int
386 islink(char *name)
387 {
388 	struct stat st;
389 
390 	if(lstat(name, &st) < 0)
391 		return 0;
392 	if((st.st_mode&S_IFMT) == S_IFLNK)
393 		return 1;
394 	return 0;
395 }
396 
397 static void
398 vacfile(DirSink *dsink, char *lname, char *sname, VacFile *vf)
399 {
400 	int fd;
401 	Dir *dir;
402 	VacDir vd;
403 	ulong entry;
404 
405 	if(isexcluded(lname)) {
406 		warn("excluding: %s", lname);
407 		return;
408 	}
409 
410 	if(merge && vacmerge(dsink, lname, sname) >= 0)
411 		return;
412 
413 	if(islink(sname))
414 		return;
415 
416 	fd = open(sname, OREAD);
417 	if(fd < 0) {
418 		warn("could not open file: %s: %r", lname);
419 		return;
420 	}
421 
422 	if(verbose)
423 		fprint(2, "%s\n", lname);
424 
425 	dir = dirfstat(fd);
426 	if(dir == nil) {
427 		warn("can't stat %s: %r", lname);
428 		close(fd);
429 		return;
430 	}
431 	dir->name = lastelem(sname);
432 
433 	entry = dsink->nentry;
434 
435 	if(dir->mode & DMDIR) 
436 		vacdir(dsink, fd, lname, sname, vf);
437 	else
438 		vacdata(dsink, fd, lname, vf, dir);
439 
440 	plan9tovacdir(&vd, dir, entry, fileid++);
441 	metasinkwritedir(dsink->msink, &vd);
442 	vdcleanup(&vd);
443 
444 	free(dir);
445 	close(fd);
446 }
447 
448 static void
449 vacstdin(DirSink *dsink, char *name, VacFile *vf)
450 {
451 	Dir *dir;
452 	VacDir vd;
453 	ulong entry;
454 
455 	if(verbose)
456 		fprint(2, "%s\n", "<stdio>");
457 
458 	dir = dirfstat(0);
459 	if(dir == nil) {
460 		warn("can't stat <stdio>: %r");
461 		return;
462 	}
463 	dir->name = "stdin";
464 
465 	entry = dsink->nentry;
466 
467 	vacdata(dsink, 0, "<stdin>", vf, dir);
468 
469 	plan9tovacdir(&vd, dir, entry, fileid++);
470 	vd.elem = vtstrdup(name);
471 	metasinkwritedir(dsink->msink, &vd);
472 	vdcleanup(&vd);
473 
474 	free(dir);
475 }
476 
477 static int
478 sha1check(u8int *score, uchar *buf, int n)
479 {
480 	char score2[VtScoreSize];
481 
482 	sha1(buf, n, score, nil);
483 	if(memcmp(score, score2, VtScoreSize) == 0)
484 		return 0;
485 	return -1;
486 }
487 
488 static ulong
489 vacdataskip(Sink *sink, VacFile *vf, int fd, ulong blocks, uchar *buf, char *lname)
490 {
491 	int n;
492 	ulong i;
493 	uchar score[VtScoreSize];
494 
495 	/* skip blocks for append only files */
496 	if(seek(fd, (blocks-1)*bsize, 0) != (blocks-1)*bsize) {
497 		warn("error seeking: %s", lname);
498 		goto Err;
499 	}
500 	n = readn(fd, buf, bsize);
501 	if(n < bsize) {
502 		warn("error checking append only file: %s", lname);
503 		goto Err;
504 	}
505 	if(vacfileblockscore(vf, blocks-1, score)<0 || sha1check(score, buf, n)<0) {
506 		warn("last block of append file did not match: %s", lname);
507 		goto Err;
508 	}
509 
510 	for(i=0; i<blocks; i++) {
511 		if(vacfileblockscore(vf, i, score) < 0) {
512 			warn("could not get score: %s: %lud", lname, i);
513 			seek(fd, i*bsize, 0);
514 			return i;
515 		}
516 		stats.skip++;
517 		sinkwritescore(sink, score, bsize);
518 	}
519 
520 	return i;
521 Err:
522 	seek(fd, 0, 0);
523 	return 0;
524 }
525 
526 static void
527 vacdata(DirSink *dsink, int fd, char *lname, VacFile *vf, Dir *dir)
528 {
529 	uchar *buf;
530 	Sink *sink;
531 	int n;
532 	uchar score[VtScoreSize];
533 	ulong block, same;
534 	VacDir vd;
535 	ulong vfblocks;
536 
537 	vfblocks = 0;
538 	if(vf != nil && qdiff) {
539 		vacfilegetdir(vf, &vd);
540 		if(vd.mtime == dir->mtime)
541 		if(vd.size == dir->length)
542 		if(!vd.plan9 || /* vd.p9path == dir->qid.path && */ vd.p9version == dir->qid.vers)
543 		if(dirsinkwritefile(dsink, vf)) {
544 			stats.sfile++;
545 			vdcleanup(&vd);
546 			return;
547 		}
548 
549 		/* look for an append only file */
550 		if((dir->mode&DMAPPEND) != 0)
551 		if(vd.size < dir->length)
552 		if(vd.plan9)
553 		if(vd.p9path == dir->qid.path)
554 			vfblocks = vd.size/bsize;
555 
556 		vdcleanup(&vd);
557 	}
558 	stats.file++;
559 
560 	buf = vtmalloc(bsize);
561 	sink = sinkalloc(dsink->sink->z, bsize, bsize);
562 	block = 0;
563 	same = stats.sdata+stats.skip;
564 
565 	if(vfblocks > 1)
566 		block += vacdataskip(sink, vf, fd, vfblocks, buf, lname);
567 
568 if(0) fprint(2, "vacData: %s: %ld\n", lname, block);
569 	for(;;) {
570 		n = readn(fd, buf, bsize);
571 		if(0 && n < 0)
572 			warn("file truncated due to read error: %s: %r", lname);
573 		if(n <= 0)
574 			break;
575 		if(vf != nil && vacfileblockscore(vf, block, score) && sha1check(score, buf, n)>=0) {
576 			stats.sdata++;
577 			sinkwritescore(sink, score, n);
578 		} else
579 			sinkwrite(sink, buf, n);
580 		block++;
581 	}
582 	same = stats.sdata+stats.skip - same;
583 
584 	if(same && (dir->mode&DMAPPEND) != 0)
585 		if(0)fprint(2, "%s: total %lud same %lud:%lud diff %lud\n",
586 			lname, block, same, vfblocks, block-same);
587 
588 	sinkclose(sink);
589 	dirsinkwritesink(dsink, sink);
590 	sinkfree(sink);
591 	free(buf);
592 }
593 
594 
595 static void
596 vacdir(DirSink *dsink, int fd, char *lname, char *sname, VacFile *vf)
597 {
598 	Dir *dirs;
599 	char *ln, *sn;
600 	int i, nd;
601 	DirSink *ds;
602 	VacFile *vvf;
603 	char *name;
604 
605 	ds = dirsinkalloc(dsink->sink->z, bsize, bsize);
606 	while((nd = dirread(fd, &dirs)) > 0){
607 		for(i = 0; i < nd; i++){
608 			name = dirs[i].name;
609 			/* check for bad file names */
610 			if(name[0] == 0 || strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
611 				continue;
612 			ln = vtmalloc(strlen(lname) + strlen(name) + 2);
613 			sn = vtmalloc(strlen(sname) + strlen(name) + 2);
614 			sprint(ln, "%s/%s", lname, name);
615 			sprint(sn, "%s/%s", sname, name);
616 			if(vf != nil)
617 				vvf = vacfilewalk(vf, name);
618 			else
619 				vvf = nil;
620 			vacfile(ds, ln, sn, vvf);
621 			if(vvf != nil)
622 				vacfiledecref(vvf);
623 			vtfree(ln);
624 			vtfree(sn);
625 		}
626 		free(dirs);
627 	}
628 	dirsinkclose(ds);
629 	dirsinkwritesink(dsink, ds->sink);
630 	dirsinkwritesink(dsink, ds->msink->sink);
631 	dirsinkfree(ds);
632 }
633 
634 static int
635 vacmergefile(DirSink *dsink, VacFile *vf, VacDir *dir, uvlong offset, uvlong *max)
636 {
637 	uchar buf[VtEntrySize];
638 	VtEntry dd, md;
639 	int e;
640 
641 	if(vacfileread(vf, buf, VtEntrySize, (uvlong)dir->entry*VtEntrySize) != VtEntrySize) {
642 		warn("could not read venti dir entry: %s\n", dir->elem);
643 		return -1;
644 	}
645 	vtentryunpack(&dd, buf, 0);
646 
647 	if(dir->mode & ModeDir)	{
648 		e = dir->mentry;
649 		if(e == 0)
650 			e = dir->entry + 1;
651 		
652 		if(vacfileread(vf, buf, VtEntrySize, e*VtEntrySize) != VtEntrySize) {
653 			warn("could not read venti dir entry: %s\n", dir->elem);
654 			return 0;
655 		}
656 		vtentryunpack(&md, buf, 0);
657 	}
658 
659 	/* max might incorrect in some old dumps */
660 	if(dir->qid >= *max) {
661 		warn("qid out of range: %s", dir->elem);
662 		*max = dir->qid;
663 	}
664 
665 	dir->qid += offset;
666 	dir->entry = dsink->nentry;
667 
668 	if(dir->qidspace) {
669 		dir->qidoffset += offset;
670 	} else {
671 		dir->qidspace = 1;
672 		dir->qidoffset = offset;
673 		dir->qidmax = *max;
674 	}
675 
676 	dirsinkwrite(dsink, &dd);
677 	if(dir->mode & ModeDir)	
678 		dirsinkwrite(dsink, &md);
679 	metasinkwritedir(dsink->msink, dir);
680 	
681 	return 0;
682 }
683 
684 static int
685 vacmerge(DirSink *dsink, char *lname, char *sname)
686 {
687 	char *p;
688 	VacFs *fs;
689 	VacFile *vf;
690 	VacDirEnum *d;
691 	VacDir dir;
692 	uvlong max;
693 
694 	p = strrchr(sname, '.');
695 	if(p == 0 || strcmp(p, ".vac"))
696 		return 0;
697 
698 	d = nil;
699 	fs = vacfsopen(dsink->sink->z, sname, VtOREAD, 100);
700 	if(fs == nil)
701 		return -1;
702 
703 	vf = vacfileopen(fs, "/");
704 	if(vf == nil)
705 		goto Done;
706 	max = vacfilegetid(vf);
707 	d = vdeopen(vf);
708 	if(d == nil)
709 		goto Done;
710 
711 	if(verbose)
712 		fprint(2, "merging: %s\n", lname);
713 
714 	if(maxbsize < fs->bsize)
715 		maxbsize = fs->bsize;
716 
717 	for(;;) {
718 		if(vderead(d, &dir) < 1)
719 			break;
720 		vacmergefile(dsink, vf, &dir, fileid, &max);
721 		vdcleanup(&dir);	
722 	}
723 	fileid += max;
724 
725 Done:
726 	if(d != nil)
727 		vdeclose(d);
728 	if(vf != nil)
729 		vacfiledecref(vf);
730 	vacfsclose(fs);
731 	return 0;
732 }
733 
734 Sink *
735 sinkalloc(VtConn *z, int psize, int dsize)
736 {
737 	Sink *k;
738 	int i;
739 
740 	if(psize < 512 || psize > VtMaxLumpSize)
741 		sysfatal("sinkalloc: bad psize");
742 	if(dsize < 512 || dsize > VtMaxLumpSize)
743 		sysfatal("sinkalloc: bad psize");
744 
745 	psize = VtScoreSize*(psize/VtScoreSize);
746 
747 	k = vtmallocz(sizeof(Sink));
748 	k->z = z;
749 	k->dir.flags = VtEntryActive;
750 	k->dir.psize = psize;
751 	k->dir.dsize = dsize;
752 	k->buf = vtmallocz(VtPointerDepth*k->dir.psize + VtScoreSize);
753 	for(i=0; i<=VtPointerDepth; i++)
754 		k->pbuf[i] = k->buf + i*k->dir.psize;
755 	return k;
756 }
757 
758 void
759 sinkwritescore(Sink *k, uchar score[VtScoreSize], int n)
760 {
761 	int i;
762 	uchar *p;
763 	VtEntry *d;
764 
765 	memmove(k->pbuf[0], score, VtScoreSize);
766 
767 	d = &k->dir;
768 
769 	for(i=0; i<VtPointerDepth; i++) {
770 		k->pbuf[i] += VtScoreSize;
771 		if(k->pbuf[i] < k->buf + d->psize*(i+1))
772 			break;
773 		if(i == VtPointerDepth-1)
774 			sysfatal("file too big");
775 		p = k->buf+i*d->psize;
776 		stats.meta++;
777 		if(vacwrite(k->z, k->pbuf[i+1], VtDataType+1+i, p, d->psize) < 0)
778 			sysfatal("vacwrite failed: %r");
779 		k->pbuf[i] = p;
780 	}
781 
782 	/* round size up to multiple of dsize */
783 	d->size = d->dsize * ((d->size + d->dsize-1)/d->dsize);
784 	
785 	d->size += n;
786 }
787 
788 void
789 sinkwrite(Sink *k, uchar *p, int n)
790 {
791 	int type;
792 	uchar score[VtScoreSize];
793 
794 	if(n > k->dir.dsize)
795 		sysfatal("sinkWrite: size too big");
796 
797 	if((k->dir.type&~VtTypeDepthMask) == VtDirType){
798 		type = VtDirType;
799 		stats.meta++;
800 	} else {
801 		type = VtDataType;
802 		stats.data++;
803 	}
804 	if(vacwrite(k->z, score, type, p, n) < 0)
805 		sysfatal("vacWrite failed: %r");
806 
807 	sinkwritescore(k, score, n);
808 }
809 
810 static int
811 sizetodepth(uvlong s, int psize, int dsize)
812 {
813 	int np;
814 	int d;
815 	
816 	/* determine pointer depth */
817 	np = psize/VtScoreSize;
818 	s = (s + dsize - 1)/dsize;
819 	for(d = 0; s > 1; d++)
820 		s = (s + np - 1)/np;
821 	return d;
822 }
823 
824 void
825 sinkclose(Sink *k)
826 {
827 	int i, n, base;
828 	uchar *p;
829 	VtEntry *kd;
830 
831 	kd = &k->dir;
832 
833 	/* empty */
834 	if(kd->size == 0) {
835 		memmove(kd->score, vtzeroscore, VtScoreSize);
836 		return;
837 	}
838 
839 	for(n=VtPointerDepth-1; n>0; n--)
840 		if(k->pbuf[n] > k->buf + kd->psize*n)
841 			break;
842 
843 	base = kd->type&~VtTypeDepthMask;
844 	kd->type = base + sizetodepth(kd->size, kd->psize, kd->dsize);
845 
846 	/* skip full part of tree */
847 	for(i=0; i<n && k->pbuf[i] == k->buf + kd->psize*i; i++)
848 		;
849 
850 	/* is the tree completely full */
851 	if(i == n && k->pbuf[n] == k->buf + kd->psize*n + VtScoreSize) {
852 		memmove(kd->score, k->pbuf[n] - VtScoreSize, VtScoreSize);
853 		return;
854 	}
855 	n++;
856 
857 	/* clean up the edge */
858 	for(; i<n; i++) {
859 		p = k->buf+i*kd->psize;
860 		stats.meta++;
861 		if(vacwrite(k->z, k->pbuf[i+1], base+1+i, p, k->pbuf[i]-p) < 0)
862 			sysfatal("vacWrite failed: %r");
863 		k->pbuf[i+1] += VtScoreSize;
864 	}
865 	memmove(kd->score, k->pbuf[i] - VtScoreSize, VtScoreSize);
866 }
867 
868 void
869 sinkfree(Sink *k)
870 {
871 	vtfree(k->buf);
872 	vtfree(k);
873 }
874 
875 DirSink *
876 dirsinkalloc(VtConn *z, int psize, int dsize)
877 {
878 	DirSink *k;
879 	int ds;
880 
881 	ds = VtEntrySize*(dsize/VtEntrySize);
882 
883 	k = vtmallocz(sizeof(DirSink));
884 	k->sink = sinkalloc(z, psize, ds);
885 	k->sink->dir.type = VtDirType;
886 	k->msink = metasinkalloc(z, psize, dsize);
887 	k->buf = vtmalloc(ds);
888 	k->p = k->buf;
889 	k->ep = k->buf + ds;
890 	return k;
891 }
892 
893 void
894 dirsinkwrite(DirSink *k, VtEntry *dir)
895 {
896 	if(k->p + VtEntrySize > k->ep) {
897 		sinkwrite(k->sink, k->buf, k->p - k->buf);
898 		k->p = k->buf;
899 	}
900 	vtentrypack(dir, k->p, 0);
901 	k->nentry++;
902 	k->p += VtEntrySize;
903 }
904 
905 void
906 dirsinkwritesink(DirSink *k, Sink *sink)
907 {
908 	dirsinkwrite(k, &sink->dir);
909 }
910 
911 int
912 dirsinkwritefile(DirSink *k, VacFile *vf)
913 {
914 	VtEntry dir;
915 
916 	if(vacfilegetvtentry(vf, &dir) < 0)
917 		return -1;
918 	dirsinkwrite(k, &dir);
919 	return 0;
920 }
921 
922 void
923 dirsinkclose(DirSink *k)
924 {
925 	metasinkclose(k->msink);
926 	if(k->p != k->buf)
927 		sinkwrite(k->sink, k->buf, k->p - k->buf);
928 	sinkclose(k->sink);
929 }
930 
931 void
932 dirsinkfree(DirSink *k)
933 {
934 	sinkfree(k->sink);
935 	metasinkfree(k->msink);
936 	vtfree(k->buf);
937 	vtfree(k);
938 }
939 
940 MetaSink*
941 metasinkalloc(VtConn *z, int psize, int dsize)
942 {
943 	MetaSink *k;
944 
945 	k = vtmallocz(sizeof(MetaSink));
946 	k->sink = sinkalloc(z, psize, dsize);
947 	k->buf = vtmalloc(dsize);
948 	k->maxindex = dsize/100;	/* 100 byte entries seems reasonable */
949 	if(k->maxindex < 1)
950 		k->maxindex = 1;
951 	k->rp = k->p = k->buf + MetaHeaderSize + k->maxindex*MetaIndexSize;
952 	k->ep = k->buf + dsize;
953 	return k;
954 }
955 
956 /* hack to get base to compare routine - not reentrant */
957 uchar *blockbase;
958 
959 int
960 dircmp(const void *p0, const void *p1)
961 {
962 	uchar *q0, *q1;
963 	int n0, n1, r;
964 
965 	/* name is first element of entry */
966 	q0 = (uchar*)p0;
967 	q0 = blockbase + (q0[0]<<8) + q0[1];
968 	n0 = (q0[6]<<8) + q0[7];
969 	q0 += 8;
970 
971 	q1 = (uchar*)p1;
972 	q1 = blockbase + (q1[0]<<8) + q1[1];
973 	n1 = (q1[6]<<8) + q1[7];
974 	q1 += 8;
975 
976 	if(n0 == n1)
977 		return memcmp(q0, q1, n0);
978 	else if (n0 < n1) {
979 		r = memcmp(q0, q1, n0);
980 		return (r==0)?1:r;
981 	} else  {
982 		r = memcmp(q0, q1, n1);
983 		return (r==0)?-1:r;
984 	}
985 }
986 
987 void
988 metasinkflush(MetaSink *k)
989 {
990 	uchar *p;
991 	int n;
992 	MetaBlock mb;
993 
994 	if(k->nindex == 0)
995 		return;
996 	assert(k->nindex <= k->maxindex);
997 
998 	p = k->buf;
999 	n = k->rp - p;
1000 
1001 	mb.size = n;
1002 	mb.free = 0;
1003 	mb.nindex = k->nindex;
1004 	mb.maxindex = k->maxindex;
1005 	mb.buf = p;
1006 	mbpack(&mb);
1007 	
1008 	p += MetaHeaderSize;
1009 
1010 	/* XXX this is not reentrant! */
1011 	blockbase = k->buf;
1012 	qsort(p, k->nindex, MetaIndexSize, dircmp);
1013 	p += k->nindex*MetaIndexSize;
1014 	
1015 	memset(p, 0, (k->maxindex-k->nindex)*MetaIndexSize);
1016 	p += (k->maxindex-k->nindex)*MetaIndexSize;
1017 
1018 	sinkwrite(k->sink, k->buf, n);
1019 
1020 	/* move down partial entry */
1021 	n = k->p - k->rp;
1022 	memmove(p, k->rp, n);
1023 	k->rp = p;
1024 	k->p = p + n;
1025 	k->nindex = 0;
1026 }
1027 
1028 void
1029 metasinkputc(MetaSink *k, int c)
1030 {
1031 	if(k->p+1 > k->ep)
1032 		metasinkflush(k);
1033 	if(k->p+1 > k->ep)
1034 		sysfatal("directory entry too large");
1035 	k->p[0] = c;
1036 	k->p++;
1037 }
1038 
1039 void
1040 metasinkputstring(MetaSink *k, char *s)
1041 {
1042 	int n = strlen(s);
1043 	metasinkputc(k, n>>8);
1044 	metasinkputc(k, n);
1045 	metasinkwrite(k, (uchar*)s, n);
1046 }
1047 
1048 void
1049 metasinkputuint32(MetaSink *k, ulong x)
1050 {
1051 	metasinkputc(k, x>>24);
1052 	metasinkputc(k, x>>16);
1053 	metasinkputc(k, x>>8);
1054 	metasinkputc(k, x);
1055 }
1056 
1057 void
1058 metasinkputuint64(MetaSink *k, uvlong x)
1059 {
1060 	metasinkputuint32(k, x>>32);
1061 	metasinkputuint32(k, x);
1062 }
1063 
1064 void
1065 metasinkwrite(MetaSink *k, uchar *data, int n)
1066 {
1067 	if(k->p + n > k->ep)
1068 		metasinkflush(k);
1069 	if(k->p + n > k->ep)
1070 		sysfatal("directory entry too large");
1071 	
1072 	memmove(k->p, data, n);
1073 	k->p += n;
1074 }
1075 
1076 void
1077 metasinkwritedir(MetaSink *ms, VacDir *dir)
1078 {
1079 	metasinkputuint32(ms, DirMagic);
1080 	metasinkputc(ms, Version>>8);
1081 	metasinkputc(ms, Version);		
1082 	metasinkputstring(ms, dir->elem);
1083 	metasinkputuint32(ms, dir->entry);
1084 	metasinkputuint64(ms, dir->qid);
1085 	metasinkputstring(ms, dir->uid);
1086 	metasinkputstring(ms, dir->gid);
1087 	metasinkputstring(ms, dir->mid);
1088 	metasinkputuint32(ms, dir->mtime);
1089 	metasinkputuint32(ms, dir->mcount);
1090 	metasinkputuint32(ms, dir->ctime);
1091 	metasinkputuint32(ms, dir->atime);
1092 	metasinkputuint32(ms, dir->mode);
1093 
1094 	if(dir->plan9) {
1095 		metasinkputc(ms, DirPlan9Entry);	/* plan9 extra info */
1096 		metasinkputc(ms, 0);			/* plan9 extra size */
1097 		metasinkputc(ms, 12);			/* plan9 extra size */
1098 		metasinkputuint64(ms, dir->p9path);
1099 		metasinkputuint32(ms, dir->p9version);
1100 	}
1101 
1102 	if(dir->qidspace != 0) {
1103 		metasinkputc(ms, DirQidSpaceEntry);
1104 		metasinkputc(ms, 0);
1105 		metasinkputc(ms, 16);
1106 		metasinkputuint64(ms, dir->qidoffset);
1107 		metasinkputuint64(ms, dir->qidmax);
1108 	}
1109 
1110 	if(dir->gen != 0) {
1111 		metasinkputc(ms, DirGenEntry);
1112 		metasinkputc(ms, 0);
1113 		metasinkputc(ms, 4);
1114 		metasinkputuint32(ms, dir->gen);
1115 	}
1116 
1117 	metasinkeor(ms);
1118 }
1119 
1120 
1121 void
1122 plan9tovacdir(VacDir *vd, Dir *dir, ulong entry, uvlong qid)
1123 {
1124 	memset(vd, 0, sizeof(VacDir));
1125 
1126 	vd->elem = vtstrdup(dir->name);
1127 	vd->entry = entry;
1128 	vd->qid = qid;
1129 	vd->uid = vtstrdup(dir->uid);
1130 	vd->gid = vtstrdup(dir->gid);
1131 	vd->mid = vtstrdup(dir->muid);
1132 	vd->mtime = dir->mtime;
1133 	vd->mcount = 0;
1134 	vd->ctime = dir->mtime;		/* ctime: not available on plan 9 */
1135 	vd->atime = dir->atime;
1136 
1137 	vd->mode = dir->mode & 0777;
1138 	if(dir->mode & DMDIR)
1139 		vd->mode |= ModeDir;
1140 	if(dir->mode & DMAPPEND)
1141 		vd->mode |= ModeAppend;
1142 	if(dir->mode & DMEXCL)
1143 		vd->mode |= ModeExclusive;
1144 
1145 	vd->plan9 = 1;
1146 	vd->p9path = dir->qid.path;
1147 	vd->p9version = dir->qid.vers;
1148 }
1149 
1150 
1151 void
1152 metasinkeor(MetaSink *k)
1153 {
1154 	uchar *p;
1155 	int o, n;
1156 
1157 	p = k->buf + MetaHeaderSize;
1158 	p += k->nindex * MetaIndexSize;
1159 	o = k->rp-k->buf; 	/* offset from start of block */
1160 	n = k->p-k->rp;		/* size of entry */
1161 	p[0] = o >> 8;
1162 	p[1] = o;
1163 	p[2] = n >> 8;
1164 	p[3] = n;
1165 	k->rp = k->p;
1166 	k->nindex++;
1167 	if(k->nindex == k->maxindex)
1168 		metasinkflush(k);
1169 }
1170 
1171 void
1172 metasinkclose(MetaSink *k)
1173 {
1174 	metasinkflush(k);
1175 	sinkclose(k->sink);
1176 }
1177 
1178 void
1179 metasinkfree(MetaSink *k)
1180 {
1181 	sinkfree(k->sink);
1182 	vtfree(k->buf);
1183 	vtfree(k);
1184 }
1185 
1186 static void
1187 warn(char *fmt, ...)
1188 {
1189 	va_list arg;
1190 
1191 	va_start(arg, fmt);
1192 	fprint(2, "%s: ", argv0);
1193 	vfprint(2, fmt, arg);
1194 	fprint(2, "\n");
1195 	va_end(arg);
1196 }
1197 
1198 static void
1199 cleanup(void)
1200 {
1201 	if(oname != nil)
1202 		remove(oname);
1203 }
1204 
1205 #define TWID64	((u64int)~(u64int)0)
1206 
1207 static u64int
1208 unittoull(char *s)
1209 {
1210 	char *es;
1211 	u64int n;
1212 
1213 	if(s == nil)
1214 		return TWID64;
1215 	n = strtoul(s, &es, 0);
1216 	if(*es == 'k' || *es == 'K'){
1217 		n *= 1024;
1218 		es++;
1219 	}else if(*es == 'm' || *es == 'M'){
1220 		n *= 1024*1024;
1221 		es++;
1222 	}else if(*es == 'g' || *es == 'G'){
1223 		n *= 1024*1024*1024;
1224 		es++;
1225 	}
1226 	if(*es != '\0')
1227 		return TWID64;
1228 	return n;
1229 }