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 	threadexitsall("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 void
386 vacfile(DirSink *dsink, char *lname, char *sname, VacFile *vf)
387 {
388 	int fd;
389 	Dir *dir;
390 	VacDir vd;
391 	ulong entry;
392 
393 	if(isexcluded(lname)) {
394 		warn("excluding: %s", lname);
395 		return;
396 	}
397 
398 	if(merge && vacmerge(dsink, lname, sname) >= 0)
399 		return;
400 
401 	if((dir = dirstat(sname)) == nil){
402 		warn("could not stat file %s: %r", lname);
403 		return;
404 	}
405 	if(dir->mode&(DMSYMLINK|DMDEVICE|DMNAMEDPIPE|DMSOCKET)){
406 		free(dir);
407 		return;
408 	}
409 	free(dir);
410 	
411 	fd = open(sname, OREAD);
412 	if(fd < 0) {
413 		warn("could not open file: %s: %r", lname);
414 		return;
415 	}
416 
417 	if(verbose)
418 		fprint(2, "%s\n", lname);
419 
420 	dir = dirfstat(fd);
421 	if(dir == nil) {
422 		warn("can't stat %s: %r", lname);
423 		close(fd);
424 		return;
425 	}
426 	dir->name = lastelem(sname);
427 
428 	entry = dsink->nentry;
429 
430 	if(dir->mode & DMDIR) 
431 		vacdir(dsink, fd, lname, sname, vf);
432 	else
433 		vacdata(dsink, fd, lname, vf, dir);
434 
435 	plan9tovacdir(&vd, dir, entry, fileid++);
436 	metasinkwritedir(dsink->msink, &vd);
437 	vdcleanup(&vd);
438 
439 	free(dir);
440 	close(fd);
441 }
442 
443 static void
444 vacstdin(DirSink *dsink, char *name, VacFile *vf)
445 {
446 	Dir *dir;
447 	VacDir vd;
448 	ulong entry;
449 
450 	if(verbose)
451 		fprint(2, "%s\n", "<stdio>");
452 
453 	dir = dirfstat(0);
454 	if(dir == nil) {
455 		warn("can't stat <stdio>: %r");
456 		return;
457 	}
458 	dir->name = "stdin";
459 
460 	entry = dsink->nentry;
461 
462 	vacdata(dsink, 0, "<stdin>", vf, dir);
463 
464 	plan9tovacdir(&vd, dir, entry, fileid++);
465 	vd.elem = vtstrdup(name);
466 	metasinkwritedir(dsink->msink, &vd);
467 	vdcleanup(&vd);
468 
469 	free(dir);
470 }
471 
472 static int
473 sha1check(u8int *score, uchar *buf, int n)
474 {
475 	char score2[VtScoreSize];
476 
477 	sha1(buf, n, score, nil);
478 	if(memcmp(score, score2, VtScoreSize) == 0)
479 		return 0;
480 	return -1;
481 }
482 
483 static ulong
484 vacdataskip(Sink *sink, VacFile *vf, int fd, ulong blocks, uchar *buf, char *lname)
485 {
486 	int n;
487 	ulong i;
488 	uchar score[VtScoreSize];
489 
490 	/* skip blocks for append only files */
491 	if(seek(fd, (blocks-1)*bsize, 0) != (blocks-1)*bsize) {
492 		warn("error seeking: %s", lname);
493 		goto Err;
494 	}
495 	n = readn(fd, buf, bsize);
496 	if(n < bsize) {
497 		warn("error checking append only file: %s", lname);
498 		goto Err;
499 	}
500 	if(vacfileblockscore(vf, blocks-1, score)<0 || sha1check(score, buf, n)<0) {
501 		warn("last block of append file did not match: %s", lname);
502 		goto Err;
503 	}
504 
505 	for(i=0; i<blocks; i++) {
506 		if(vacfileblockscore(vf, i, score) < 0) {
507 			warn("could not get score: %s: %lud", lname, i);
508 			seek(fd, i*bsize, 0);
509 			return i;
510 		}
511 		stats.skip++;
512 		sinkwritescore(sink, score, bsize);
513 	}
514 
515 	return i;
516 Err:
517 	seek(fd, 0, 0);
518 	return 0;
519 }
520 
521 static void
522 vacdata(DirSink *dsink, int fd, char *lname, VacFile *vf, Dir *dir)
523 {
524 	uchar *buf;
525 	Sink *sink;
526 	int n;
527 	uchar score[VtScoreSize];
528 	ulong block, same;
529 	VacDir vd;
530 	ulong vfblocks;
531 
532 	vfblocks = 0;
533 	if(vf != nil && qdiff) {
534 		vacfilegetdir(vf, &vd);
535 		if(vd.mtime == dir->mtime)
536 		if(vd.size == dir->length)
537 		if(!vd.plan9 || /* vd.p9path == dir->qid.path && */ vd.p9version == dir->qid.vers)
538 		if(dirsinkwritefile(dsink, vf)) {
539 			stats.sfile++;
540 			vdcleanup(&vd);
541 			return;
542 		}
543 
544 		/* look for an append only file */
545 		if((dir->mode&DMAPPEND) != 0)
546 		if(vd.size < dir->length)
547 		if(vd.plan9)
548 		if(vd.p9path == dir->qid.path)
549 			vfblocks = vd.size/bsize;
550 
551 		vdcleanup(&vd);
552 	}
553 	stats.file++;
554 
555 	buf = vtmalloc(bsize);
556 	sink = sinkalloc(dsink->sink->z, bsize, bsize);
557 	block = 0;
558 	same = stats.sdata+stats.skip;
559 
560 	if(vfblocks > 1)
561 		block += vacdataskip(sink, vf, fd, vfblocks, buf, lname);
562 
563 if(0) fprint(2, "vacData: %s: %ld\n", lname, block);
564 	for(;;) {
565 		n = readn(fd, buf, bsize);
566 		if(0 && n < 0)
567 			warn("file truncated due to read error: %s: %r", lname);
568 		if(n <= 0)
569 			break;
570 		if(vf != nil && vacfileblockscore(vf, block, score) && sha1check(score, buf, n)>=0) {
571 			stats.sdata++;
572 			sinkwritescore(sink, score, n);
573 		} else
574 			sinkwrite(sink, buf, n);
575 		block++;
576 	}
577 	same = stats.sdata+stats.skip - same;
578 
579 	if(same && (dir->mode&DMAPPEND) != 0)
580 		if(0)fprint(2, "%s: total %lud same %lud:%lud diff %lud\n",
581 			lname, block, same, vfblocks, block-same);
582 
583 	sinkclose(sink);
584 	dirsinkwritesink(dsink, sink);
585 	sinkfree(sink);
586 	free(buf);
587 }
588 
589 
590 static void
591 vacdir(DirSink *dsink, int fd, char *lname, char *sname, VacFile *vf)
592 {
593 	Dir *dirs;
594 	char *ln, *sn;
595 	int i, nd;
596 	DirSink *ds;
597 	VacFile *vvf;
598 	char *name;
599 
600 	ds = dirsinkalloc(dsink->sink->z, bsize, bsize);
601 	while((nd = dirread(fd, &dirs)) > 0){
602 		for(i = 0; i < nd; i++){
603 			name = dirs[i].name;
604 			/* check for bad file names */
605 			if(name[0] == 0 || strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
606 				continue;
607 			ln = vtmalloc(strlen(lname) + strlen(name) + 2);
608 			sn = vtmalloc(strlen(sname) + strlen(name) + 2);
609 			sprint(ln, "%s/%s", lname, name);
610 			sprint(sn, "%s/%s", sname, name);
611 			if(vf != nil)
612 				vvf = vacfilewalk(vf, name);
613 			else
614 				vvf = nil;
615 			vacfile(ds, ln, sn, vvf);
616 			if(vvf != nil)
617 				vacfiledecref(vvf);
618 			vtfree(ln);
619 			vtfree(sn);
620 		}
621 		free(dirs);
622 	}
623 	dirsinkclose(ds);
624 	dirsinkwritesink(dsink, ds->sink);
625 	dirsinkwritesink(dsink, ds->msink->sink);
626 	dirsinkfree(ds);
627 }
628 
629 static int
630 vacmergefile(DirSink *dsink, VacFile *vf, VacDir *dir, uvlong offset, uvlong *max)
631 {
632 	uchar buf[VtEntrySize];
633 	VtEntry dd, md;
634 	int e;
635 
636 	if(vacfileread(vf, buf, VtEntrySize, (uvlong)dir->entry*VtEntrySize) != VtEntrySize) {
637 		warn("could not read venti dir entry: %s\n", dir->elem);
638 		return -1;
639 	}
640 	vtentryunpack(&dd, buf, 0);
641 
642 	if(dir->mode & ModeDir)	{
643 		e = dir->mentry;
644 		if(e == 0)
645 			e = dir->entry + 1;
646 		
647 		if(vacfileread(vf, buf, VtEntrySize, e*VtEntrySize) != VtEntrySize) {
648 			warn("could not read venti dir entry: %s\n", dir->elem);
649 			return 0;
650 		}
651 		vtentryunpack(&md, buf, 0);
652 	}
653 
654 	/* max might incorrect in some old dumps */
655 	if(dir->qid >= *max) {
656 		warn("qid out of range: %s", dir->elem);
657 		*max = dir->qid;
658 	}
659 
660 	dir->qid += offset;
661 	dir->entry = dsink->nentry;
662 
663 	if(dir->qidspace) {
664 		dir->qidoffset += offset;
665 	} else {
666 		dir->qidspace = 1;
667 		dir->qidoffset = offset;
668 		dir->qidmax = *max;
669 	}
670 
671 	dirsinkwrite(dsink, &dd);
672 	if(dir->mode & ModeDir)	
673 		dirsinkwrite(dsink, &md);
674 	metasinkwritedir(dsink->msink, dir);
675 	
676 	return 0;
677 }
678 
679 static int
680 vacmerge(DirSink *dsink, char *lname, char *sname)
681 {
682 	char *p;
683 	VacFs *fs;
684 	VacFile *vf;
685 	VacDirEnum *d;
686 	VacDir dir;
687 	uvlong max;
688 
689 	p = strrchr(sname, '.');
690 	if(p == 0 || strcmp(p, ".vac"))
691 		return 0;
692 
693 	d = nil;
694 	fs = vacfsopen(dsink->sink->z, sname, VtOREAD, 100);
695 	if(fs == nil)
696 		return -1;
697 
698 	vf = vacfileopen(fs, "/");
699 	if(vf == nil)
700 		goto Done;
701 	max = vacfilegetid(vf);
702 	d = vdeopen(vf);
703 	if(d == nil)
704 		goto Done;
705 
706 	if(verbose)
707 		fprint(2, "merging: %s\n", lname);
708 
709 	if(maxbsize < fs->bsize)
710 		maxbsize = fs->bsize;
711 
712 	for(;;) {
713 		if(vderead(d, &dir) < 1)
714 			break;
715 		vacmergefile(dsink, vf, &dir, fileid, &max);
716 		vdcleanup(&dir);	
717 	}
718 	fileid += max;
719 
720 Done:
721 	if(d != nil)
722 		vdeclose(d);
723 	if(vf != nil)
724 		vacfiledecref(vf);
725 	vacfsclose(fs);
726 	return 0;
727 }
728 
729 Sink *
730 sinkalloc(VtConn *z, int psize, int dsize)
731 {
732 	Sink *k;
733 	int i;
734 
735 	if(psize < 512 || psize > VtMaxLumpSize)
736 		sysfatal("sinkalloc: bad psize");
737 	if(dsize < 512 || dsize > VtMaxLumpSize)
738 		sysfatal("sinkalloc: bad psize");
739 
740 	psize = VtScoreSize*(psize/VtScoreSize);
741 
742 	k = vtmallocz(sizeof(Sink));
743 	k->z = z;
744 	k->dir.flags = VtEntryActive;
745 	k->dir.psize = psize;
746 	k->dir.dsize = dsize;
747 	k->buf = vtmallocz(VtPointerDepth*k->dir.psize + VtScoreSize);
748 	for(i=0; i<=VtPointerDepth; i++)
749 		k->pbuf[i] = k->buf + i*k->dir.psize;
750 	return k;
751 }
752 
753 void
754 sinkwritescore(Sink *k, uchar score[VtScoreSize], int n)
755 {
756 	int i;
757 	uchar *p;
758 	VtEntry *d;
759 
760 	memmove(k->pbuf[0], score, VtScoreSize);
761 
762 	d = &k->dir;
763 
764 	for(i=0; i<VtPointerDepth; i++) {
765 		k->pbuf[i] += VtScoreSize;
766 		if(k->pbuf[i] < k->buf + d->psize*(i+1))
767 			break;
768 		if(i == VtPointerDepth-1)
769 			sysfatal("file too big");
770 		p = k->buf+i*d->psize;
771 		stats.meta++;
772 		if(vacwrite(k->z, k->pbuf[i+1], VtDataType+1+i, p, d->psize) < 0)
773 			sysfatal("vacwrite failed: %r");
774 		k->pbuf[i] = p;
775 	}
776 
777 	/* round size up to multiple of dsize */
778 	d->size = d->dsize * ((d->size + d->dsize-1)/d->dsize);
779 	
780 	d->size += n;
781 }
782 
783 void
784 sinkwrite(Sink *k, uchar *p, int n)
785 {
786 	int type;
787 	uchar score[VtScoreSize];
788 
789 	if(n > k->dir.dsize)
790 		sysfatal("sinkWrite: size too big");
791 
792 	if((k->dir.type&~VtTypeDepthMask) == VtDirType){
793 		type = VtDirType;
794 		stats.meta++;
795 	} else {
796 		type = VtDataType;
797 		stats.data++;
798 	}
799 	if(vacwrite(k->z, score, type, p, n) < 0)
800 		sysfatal("vacWrite failed: %r");
801 
802 	sinkwritescore(k, score, n);
803 }
804 
805 static int
806 sizetodepth(uvlong s, int psize, int dsize)
807 {
808 	int np;
809 	int d;
810 	
811 	/* determine pointer depth */
812 	np = psize/VtScoreSize;
813 	s = (s + dsize - 1)/dsize;
814 	for(d = 0; s > 1; d++)
815 		s = (s + np - 1)/np;
816 	return d;
817 }
818 
819 void
820 sinkclose(Sink *k)
821 {
822 	int i, n, base;
823 	uchar *p;
824 	VtEntry *kd;
825 
826 	kd = &k->dir;
827 
828 	/* empty */
829 	if(kd->size == 0) {
830 		memmove(kd->score, vtzeroscore, VtScoreSize);
831 		return;
832 	}
833 
834 	for(n=VtPointerDepth-1; n>0; n--)
835 		if(k->pbuf[n] > k->buf + kd->psize*n)
836 			break;
837 
838 	base = kd->type&~VtTypeDepthMask;
839 	kd->type = base + sizetodepth(kd->size, kd->psize, kd->dsize);
840 
841 	/* skip full part of tree */
842 	for(i=0; i<n && k->pbuf[i] == k->buf + kd->psize*i; i++)
843 		;
844 
845 	/* is the tree completely full */
846 	if(i == n && k->pbuf[n] == k->buf + kd->psize*n + VtScoreSize) {
847 		memmove(kd->score, k->pbuf[n] - VtScoreSize, VtScoreSize);
848 		return;
849 	}
850 	n++;
851 
852 	/* clean up the edge */
853 	for(; i<n; i++) {
854 		p = k->buf+i*kd->psize;
855 		stats.meta++;
856 		if(vacwrite(k->z, k->pbuf[i+1], base+1+i, p, k->pbuf[i]-p) < 0)
857 			sysfatal("vacWrite failed: %r");
858 		k->pbuf[i+1] += VtScoreSize;
859 	}
860 	memmove(kd->score, k->pbuf[i] - VtScoreSize, VtScoreSize);
861 }
862 
863 void
864 sinkfree(Sink *k)
865 {
866 	vtfree(k->buf);
867 	vtfree(k);
868 }
869 
870 DirSink *
871 dirsinkalloc(VtConn *z, int psize, int dsize)
872 {
873 	DirSink *k;
874 	int ds;
875 
876 	ds = VtEntrySize*(dsize/VtEntrySize);
877 
878 	k = vtmallocz(sizeof(DirSink));
879 	k->sink = sinkalloc(z, psize, ds);
880 	k->sink->dir.type = VtDirType;
881 	k->msink = metasinkalloc(z, psize, dsize);
882 	k->buf = vtmalloc(ds);
883 	k->p = k->buf;
884 	k->ep = k->buf + ds;
885 	return k;
886 }
887 
888 void
889 dirsinkwrite(DirSink *k, VtEntry *dir)
890 {
891 	if(k->p + VtEntrySize > k->ep) {
892 		sinkwrite(k->sink, k->buf, k->p - k->buf);
893 		k->p = k->buf;
894 	}
895 	vtentrypack(dir, k->p, 0);
896 	k->nentry++;
897 	k->p += VtEntrySize;
898 }
899 
900 void
901 dirsinkwritesink(DirSink *k, Sink *sink)
902 {
903 	dirsinkwrite(k, &sink->dir);
904 }
905 
906 int
907 dirsinkwritefile(DirSink *k, VacFile *vf)
908 {
909 	VtEntry dir;
910 
911 	if(vacfilegetvtentry(vf, &dir) < 0)
912 		return -1;
913 	dirsinkwrite(k, &dir);
914 	return 0;
915 }
916 
917 void
918 dirsinkclose(DirSink *k)
919 {
920 	metasinkclose(k->msink);
921 	if(k->p != k->buf)
922 		sinkwrite(k->sink, k->buf, k->p - k->buf);
923 	sinkclose(k->sink);
924 }
925 
926 void
927 dirsinkfree(DirSink *k)
928 {
929 	sinkfree(k->sink);
930 	metasinkfree(k->msink);
931 	vtfree(k->buf);
932 	vtfree(k);
933 }
934 
935 MetaSink*
936 metasinkalloc(VtConn *z, int psize, int dsize)
937 {
938 	MetaSink *k;
939 
940 	k = vtmallocz(sizeof(MetaSink));
941 	k->sink = sinkalloc(z, psize, dsize);
942 	k->buf = vtmalloc(dsize);
943 	k->maxindex = dsize/100;	/* 100 byte entries seems reasonable */
944 	if(k->maxindex < 1)
945 		k->maxindex = 1;
946 	k->rp = k->p = k->buf + MetaHeaderSize + k->maxindex*MetaIndexSize;
947 	k->ep = k->buf + dsize;
948 	return k;
949 }
950 
951 /* hack to get base to compare routine - not reentrant */
952 uchar *blockbase;
953 
954 int
955 dircmp(const void *p0, const void *p1)
956 {
957 	uchar *q0, *q1;
958 	int n0, n1, r;
959 
960 	/* name is first element of entry */
961 	q0 = (uchar*)p0;
962 	q0 = blockbase + (q0[0]<<8) + q0[1];
963 	n0 = (q0[6]<<8) + q0[7];
964 	q0 += 8;
965 
966 	q1 = (uchar*)p1;
967 	q1 = blockbase + (q1[0]<<8) + q1[1];
968 	n1 = (q1[6]<<8) + q1[7];
969 	q1 += 8;
970 
971 	if(n0 == n1)
972 		return memcmp(q0, q1, n0);
973 	else if (n0 < n1) {
974 		r = memcmp(q0, q1, n0);
975 		return (r==0)?1:r;
976 	} else  {
977 		r = memcmp(q0, q1, n1);
978 		return (r==0)?-1:r;
979 	}
980 }
981 
982 void
983 metasinkflush(MetaSink *k)
984 {
985 	uchar *p;
986 	int n;
987 	MetaBlock mb;
988 
989 	if(k->nindex == 0)
990 		return;
991 	assert(k->nindex <= k->maxindex);
992 
993 	p = k->buf;
994 	n = k->rp - p;
995 
996 	mb.size = n;
997 	mb.free = 0;
998 	mb.nindex = k->nindex;
999 	mb.maxindex = k->maxindex;
1000 	mb.buf = p;
1001 	mbpack(&mb);
1002 	
1003 	p += MetaHeaderSize;
1004 
1005 	/* XXX this is not reentrant! */
1006 	blockbase = k->buf;
1007 	qsort(p, k->nindex, MetaIndexSize, dircmp);
1008 	p += k->nindex*MetaIndexSize;
1009 	
1010 	memset(p, 0, (k->maxindex-k->nindex)*MetaIndexSize);
1011 	p += (k->maxindex-k->nindex)*MetaIndexSize;
1012 
1013 	sinkwrite(k->sink, k->buf, n);
1014 
1015 	/* move down partial entry */
1016 	n = k->p - k->rp;
1017 	memmove(p, k->rp, n);
1018 	k->rp = p;
1019 	k->p = p + n;
1020 	k->nindex = 0;
1021 }
1022 
1023 void
1024 metasinkputc(MetaSink *k, int c)
1025 {
1026 	if(k->p+1 > k->ep)
1027 		metasinkflush(k);
1028 	if(k->p+1 > k->ep)
1029 		sysfatal("directory entry too large");
1030 	k->p[0] = c;
1031 	k->p++;
1032 }
1033 
1034 void
1035 metasinkputstring(MetaSink *k, char *s)
1036 {
1037 	int n = strlen(s);
1038 	metasinkputc(k, n>>8);
1039 	metasinkputc(k, n);
1040 	metasinkwrite(k, (uchar*)s, n);
1041 }
1042 
1043 void
1044 metasinkputuint32(MetaSink *k, ulong x)
1045 {
1046 	metasinkputc(k, x>>24);
1047 	metasinkputc(k, x>>16);
1048 	metasinkputc(k, x>>8);
1049 	metasinkputc(k, x);
1050 }
1051 
1052 void
1053 metasinkputuint64(MetaSink *k, uvlong x)
1054 {
1055 	metasinkputuint32(k, x>>32);
1056 	metasinkputuint32(k, x);
1057 }
1058 
1059 void
1060 metasinkwrite(MetaSink *k, uchar *data, int n)
1061 {
1062 	if(k->p + n > k->ep)
1063 		metasinkflush(k);
1064 	if(k->p + n > k->ep)
1065 		sysfatal("directory entry too large");
1066 	
1067 	memmove(k->p, data, n);
1068 	k->p += n;
1069 }
1070 
1071 void
1072 metasinkwritedir(MetaSink *ms, VacDir *dir)
1073 {
1074 	metasinkputuint32(ms, DirMagic);
1075 	metasinkputc(ms, Version>>8);
1076 	metasinkputc(ms, Version);		
1077 	metasinkputstring(ms, dir->elem);
1078 	metasinkputuint32(ms, dir->entry);
1079 	metasinkputuint64(ms, dir->qid);
1080 	metasinkputstring(ms, dir->uid);
1081 	metasinkputstring(ms, dir->gid);
1082 	metasinkputstring(ms, dir->mid);
1083 	metasinkputuint32(ms, dir->mtime);
1084 	metasinkputuint32(ms, dir->mcount);
1085 	metasinkputuint32(ms, dir->ctime);
1086 	metasinkputuint32(ms, dir->atime);
1087 	metasinkputuint32(ms, dir->mode);
1088 
1089 	if(dir->plan9) {
1090 		metasinkputc(ms, DirPlan9Entry);	/* plan9 extra info */
1091 		metasinkputc(ms, 0);			/* plan9 extra size */
1092 		metasinkputc(ms, 12);			/* plan9 extra size */
1093 		metasinkputuint64(ms, dir->p9path);
1094 		metasinkputuint32(ms, dir->p9version);
1095 	}
1096 
1097 	if(dir->qidspace != 0) {
1098 		metasinkputc(ms, DirQidSpaceEntry);
1099 		metasinkputc(ms, 0);
1100 		metasinkputc(ms, 16);
1101 		metasinkputuint64(ms, dir->qidoffset);
1102 		metasinkputuint64(ms, dir->qidmax);
1103 	}
1104 
1105 	if(dir->gen != 0) {
1106 		metasinkputc(ms, DirGenEntry);
1107 		metasinkputc(ms, 0);
1108 		metasinkputc(ms, 4);
1109 		metasinkputuint32(ms, dir->gen);
1110 	}
1111 
1112 	metasinkeor(ms);
1113 }
1114 
1115 
1116 void
1117 plan9tovacdir(VacDir *vd, Dir *dir, ulong entry, uvlong qid)
1118 {
1119 	memset(vd, 0, sizeof(VacDir));
1120 
1121 	vd->elem = vtstrdup(dir->name);
1122 	vd->entry = entry;
1123 	vd->qid = qid;
1124 	vd->uid = vtstrdup(dir->uid);
1125 	vd->gid = vtstrdup(dir->gid);
1126 	vd->mid = vtstrdup(dir->muid);
1127 	vd->mtime = dir->mtime;
1128 	vd->mcount = 0;
1129 	vd->ctime = dir->mtime;		/* ctime: not available on plan 9 */
1130 	vd->atime = dir->atime;
1131 
1132 	vd->mode = dir->mode & 0777;
1133 	if(dir->mode & DMDIR)
1134 		vd->mode |= ModeDir;
1135 	if(dir->mode & DMAPPEND)
1136 		vd->mode |= ModeAppend;
1137 	if(dir->mode & DMEXCL)
1138 		vd->mode |= ModeExclusive;
1139 
1140 	vd->plan9 = 1;
1141 	vd->p9path = dir->qid.path;
1142 	vd->p9version = dir->qid.vers;
1143 }
1144 
1145 
1146 void
1147 metasinkeor(MetaSink *k)
1148 {
1149 	uchar *p;
1150 	int o, n;
1151 
1152 	p = k->buf + MetaHeaderSize;
1153 	p += k->nindex * MetaIndexSize;
1154 	o = k->rp-k->buf; 	/* offset from start of block */
1155 	n = k->p-k->rp;		/* size of entry */
1156 	p[0] = o >> 8;
1157 	p[1] = o;
1158 	p[2] = n >> 8;
1159 	p[3] = n;
1160 	k->rp = k->p;
1161 	k->nindex++;
1162 	if(k->nindex == k->maxindex)
1163 		metasinkflush(k);
1164 }
1165 
1166 void
1167 metasinkclose(MetaSink *k)
1168 {
1169 	metasinkflush(k);
1170 	sinkclose(k->sink);
1171 }
1172 
1173 void
1174 metasinkfree(MetaSink *k)
1175 {
1176 	sinkfree(k->sink);
1177 	vtfree(k->buf);
1178 	vtfree(k);
1179 }
1180 
1181 static void
1182 warn(char *fmt, ...)
1183 {
1184 	va_list arg;
1185 
1186 	va_start(arg, fmt);
1187 	fprint(2, "%s: ", argv0);
1188 	vfprint(2, fmt, arg);
1189 	fprint(2, "\n");
1190 	va_end(arg);
1191 }
1192 
1193 static void
1194 cleanup(void)
1195 {
1196 	if(oname != nil)
1197 		remove(oname);
1198 }
1199 
1200 #define TWID64	((u64int)~(u64int)0)
1201 
1202 static u64int
1203 unittoull(char *s)
1204 {
1205 	char *es;
1206 	u64int n;
1207 
1208 	if(s == nil)
1209 		return TWID64;
1210 	n = strtoul(s, &es, 0);
1211 	if(*es == 'k' || *es == 'K'){
1212 		n *= 1024;
1213 		es++;
1214 	}else if(*es == 'm' || *es == 'M'){
1215 		n *= 1024*1024;
1216 		es++;
1217 	}else if(*es == 'g' || *es == 'G'){
1218 		n *= 1024*1024*1024;
1219 		es++;
1220 	}
1221 	if(*es != '\0')
1222 		return TWID64;
1223 	return n;
1224 }