Commit | Line | Data |
---|---|---|
19cc19bb | 1 | static char *sccsid = "@(#)512restor.c 4.2 (Berkeley) %G%"; |
be684735 BJ |
2 | #define MAXINO 3000 |
3 | #define BITS 8 | |
4 | #define MAXXTR 60 | |
5 | #define NCACHE 3 | |
6 | ||
7 | #ifndef STANDALONE | |
8 | #include <stdio.h> | |
9 | #include <signal.h> | |
10 | #endif | |
11 | #include <sys/param.h> | |
12 | #include <sys/inode.h> | |
13 | #include <sys/ino.h> | |
14 | #include <sys/fblk.h> | |
15 | #include <sys/filsys.h> | |
16 | #include <sys/dir.h> | |
17 | ||
18 | #define OBSIZE 512 | |
19 | ||
20 | /* from old <ino.h> */ | |
21 | ||
22 | #define OINOPB 8 /* 8 inodes per block */ | |
23 | ||
24 | /* old <dumprestor.h> */ | |
25 | #define NTREC 20 | |
26 | #define MLEN 16 | |
27 | #define MSIZ 4096 | |
28 | ||
29 | #define TS_TAPE 1 | |
30 | #define TS_INODE 2 | |
31 | #define TS_BITS 3 | |
32 | #define TS_ADDR 4 | |
33 | #define TS_END 5 | |
34 | #define TS_CLRI 6 | |
35 | #define MAGIC (int)60011 | |
36 | #define CHECKSUM (int)84446 | |
37 | struct spcl | |
38 | { | |
39 | int c_type; | |
40 | time_t c_date; | |
41 | time_t c_ddate; | |
42 | int c_volume; | |
43 | daddr_t c_tapea; | |
44 | ino_t c_inumber; | |
45 | int c_magic; | |
46 | int c_checksum; | |
47 | struct dinode c_dinode; | |
48 | int c_count; | |
49 | char c_addr[OBSIZE]; | |
50 | } spcl; | |
51 | ||
52 | struct idates | |
53 | { | |
54 | char id_name[16]; | |
55 | char id_incno; | |
56 | time_t id_ddate; | |
57 | }; | |
58 | ||
59 | /* end of old <dumprestor.h> */ | |
60 | ||
61 | #define MWORD(m,i) (m[(unsigned)(i-1)/MLEN]) | |
62 | #define MBIT(i) (1<<((unsigned)(i-1)%MLEN)) | |
63 | #define BIS(i,w) (MWORD(w,i) |= MBIT(i)) | |
64 | #define BIC(i,w) (MWORD(w,i) &= ~MBIT(i)) | |
65 | #define BIT(i,w) (MWORD(w,i) & MBIT(i)) | |
66 | ||
67 | struct filsys sblock; | |
68 | ||
69 | int fi; | |
70 | ino_t ino, maxi, curino; | |
71 | ||
72 | int mt; | |
19cc19bb | 73 | char tapename[] = "/dev/rmt8"; |
be684735 BJ |
74 | char *magtape = tapename; |
75 | #ifdef STANDALONE | |
76 | char mbuf[50]; | |
77 | #endif | |
78 | ||
79 | #ifndef STANDALONE | |
80 | daddr_t seekpt; | |
81 | int df, ofile; | |
82 | char dirfile[] = "rstXXXXXX"; | |
83 | ||
84 | struct { | |
85 | ino_t t_ino; | |
86 | daddr_t t_seekpt; | |
87 | } inotab[MAXINO]; | |
88 | int ipos; | |
89 | ||
90 | #define ONTAPE 1 | |
91 | #define XTRACTD 2 | |
92 | #define XINUSE 4 | |
93 | struct xtrlist { | |
94 | ino_t x_ino; | |
95 | char x_flags; | |
96 | } xtrlist[MAXXTR]; | |
97 | ||
98 | char name[12]; | |
99 | ||
100 | char drblock[BSIZE]; | |
101 | int bpt; | |
102 | #endif | |
103 | ||
104 | int eflag; | |
105 | ||
106 | int volno = 1; | |
107 | ||
108 | struct dinode tino, dino; | |
109 | daddr_t taddr[NADDR]; | |
110 | ||
111 | daddr_t curbno; | |
112 | ||
113 | short dumpmap[MSIZ]; | |
114 | short clrimap[MSIZ]; | |
115 | ||
116 | ||
117 | int bct = NTREC+1; | |
118 | char tbf[NTREC*OBSIZE]; | |
119 | ||
120 | struct cache { | |
121 | daddr_t c_bno; | |
122 | int c_time; | |
123 | char c_block[BSIZE]; | |
124 | } cache[NCACHE]; | |
125 | int curcache; | |
126 | ||
127 | main(argc, argv) | |
128 | char *argv[]; | |
129 | { | |
130 | register char *cp; | |
131 | char command; | |
132 | int done(); | |
133 | ||
134 | #ifndef STANDALONE | |
135 | mktemp(dirfile); | |
136 | if (argc < 2) { | |
137 | usage: | |
138 | printf("Usage: oldrestor x file file..., oldrestor r filesys, or oldrestor t\n"); | |
139 | exit(1); | |
140 | } | |
141 | argv++; | |
142 | argc -= 2; | |
143 | for (cp = *argv++; *cp; cp++) { | |
144 | switch (*cp) { | |
145 | case '-': | |
146 | break; | |
147 | case 'f': | |
148 | magtape = *argv++; | |
149 | argc--; | |
150 | break; | |
151 | case 'r': | |
152 | case 'R': | |
153 | case 't': | |
154 | case 'x': | |
155 | command = *cp; | |
156 | break; | |
157 | default: | |
158 | printf("Bad key character %c\n", *cp); | |
159 | goto usage; | |
160 | } | |
161 | } | |
162 | if (command == 'x') { | |
163 | if (signal(SIGINT, done) == SIG_IGN) | |
164 | signal(SIGINT, SIG_IGN); | |
165 | if (signal(SIGTERM, done) == SIG_IGN) | |
166 | signal(SIGTERM, SIG_IGN); | |
167 | ||
168 | df = creat(dirfile, 0666); | |
169 | if (df < 0) { | |
170 | printf("restor: %s - cannot create directory temporary\n", dirfile); | |
171 | exit(1); | |
172 | } | |
173 | close(df); | |
174 | df = open(dirfile, 2); | |
175 | } | |
176 | doit(command, argc, argv); | |
177 | if (command == 'x') | |
178 | unlink(dirfile); | |
179 | exit(0); | |
180 | #else | |
181 | magtape = "tape"; | |
182 | doit('r', 1, 0); | |
183 | #endif | |
184 | } | |
185 | ||
186 | doit(command, argc, argv) | |
187 | char command; | |
188 | int argc; | |
189 | char *argv[]; | |
190 | { | |
191 | extern char *ctime(); | |
192 | register i, k; | |
193 | ino_t d; | |
194 | #ifndef STANDALONE | |
195 | int xtrfile(), skip(); | |
196 | #endif | |
197 | int rstrfile(), rstrskip(); | |
198 | struct dinode *ip, *ip1; | |
199 | ||
200 | #ifndef STANDALONE | |
201 | if ((mt = open(magtape, 0)) < 0) { | |
202 | printf("%s: cannot open tape\n", magtape); | |
203 | exit(1); | |
204 | } | |
205 | #else | |
206 | do { | |
207 | printf("Tape? "); | |
208 | gets(mbuf); | |
209 | mt = open(mbuf, 0); | |
210 | } while (mt == -1); | |
211 | magtape = mbuf; | |
212 | #endif | |
213 | switch(command) { | |
214 | #ifndef STANDALONE | |
215 | case 't': | |
216 | if (readhdr(&spcl) == 0) { | |
217 | printf("Tape is not a dump tape\n"); | |
218 | exit(1); | |
219 | } | |
220 | printf("Dump date: %s", ctime(&spcl.c_date)); | |
221 | printf("Dumped from: %s", ctime(&spcl.c_ddate)); | |
222 | return; | |
223 | case 'x': | |
224 | if (readhdr(&spcl) == 0) { | |
225 | printf("Tape is not a dump tape\n"); | |
226 | exit(1); | |
227 | } | |
228 | if (checkvol(&spcl, 1) == 0) { | |
229 | printf("Tape is not volume 1 of the dump\n"); | |
230 | exit(1); | |
231 | } | |
232 | pass1(); /* This sets the various maps on the way by */ | |
233 | i = 0; | |
234 | while (i < MAXXTR-1 && argc--) { | |
235 | if ((d = psearch(*argv)) == 0 || BIT(d, dumpmap) == 0) { | |
236 | printf("%s: not on the tape\n", *argv++); | |
237 | continue; | |
238 | } | |
239 | xtrlist[i].x_ino = d; | |
240 | xtrlist[i].x_flags |= XINUSE; | |
241 | printf("%s: inode %u\n", *argv, d); | |
242 | argv++; | |
243 | i++; | |
244 | } | |
245 | newvol: | |
246 | flsht(); | |
247 | close(mt); | |
248 | getvol: | |
249 | printf("Mount desired tape volume: Specify volume #: "); | |
250 | if (gets(tbf) == NULL) | |
251 | return; | |
252 | volno = atoi(tbf); | |
253 | if (volno <= 0) { | |
254 | printf("Volume numbers are positive numerics\n"); | |
255 | goto getvol; | |
256 | } | |
257 | mt = open(magtape, 0); | |
258 | if (readhdr(&spcl) == 0) { | |
259 | printf("tape is not dump tape\n"); | |
260 | goto newvol; | |
261 | } | |
262 | if (checkvol(&spcl, volno) == 0) { | |
263 | printf("Wrong volume (%d)\n", spcl.c_volume); | |
264 | goto newvol; | |
265 | } | |
266 | rbits: | |
267 | while (gethead(&spcl) == 0) | |
268 | ; | |
269 | if (checktype(&spcl, TS_INODE) == 1) { | |
270 | printf("Can't find inode mask!\n"); | |
271 | goto newvol; | |
272 | } | |
273 | if (checktype(&spcl, TS_BITS) == 0) | |
274 | goto rbits; | |
275 | readbits(dumpmap); | |
276 | i = 0; | |
277 | for (k = 0; xtrlist[k].x_flags; k++) { | |
278 | if (BIT(xtrlist[k].x_ino, dumpmap)) { | |
279 | xtrlist[k].x_flags |= ONTAPE; | |
280 | i++; | |
281 | } | |
282 | } | |
283 | while (i > 0) { | |
284 | again: | |
285 | if (ishead(&spcl) == 0) | |
286 | while(gethead(&spcl) == 0) | |
287 | ; | |
288 | if (checktype(&spcl, TS_END) == 1) { | |
289 | printf("end of tape\n"); | |
290 | checkdone: | |
291 | for (k = 0; xtrlist[k].x_flags; k++) | |
292 | if ((xtrlist[k].x_flags&XTRACTD) == 0) | |
293 | goto newvol; | |
294 | return; | |
295 | } | |
296 | if (checktype(&spcl, TS_INODE) == 0) { | |
297 | gethead(&spcl); | |
298 | goto again; | |
299 | } | |
300 | d = spcl.c_inumber; | |
301 | for (k = 0; xtrlist[k].x_flags; k++) { | |
302 | if (d == xtrlist[k].x_ino) { | |
303 | printf("extract file %u\n", xtrlist[k].x_ino); | |
304 | sprintf(name, "%u", xtrlist[k].x_ino); | |
305 | if ((ofile = creat(name, 0666)) < 0) { | |
306 | printf("%s: cannot create file\n", name); | |
307 | i--; | |
308 | continue; | |
309 | } | |
310 | chown(name, spcl.c_dinode.di_uid, spcl.c_dinode.di_gid); | |
311 | getfile(ino, xtrfile, skip, spcl.c_dinode.di_size); | |
312 | i--; | |
313 | xtrlist[k].x_flags |= XTRACTD; | |
314 | close(ofile); | |
315 | goto done; | |
316 | } | |
317 | } | |
318 | gethead(&spcl); | |
319 | done: | |
320 | ; | |
321 | } | |
322 | goto checkdone; | |
323 | #endif | |
324 | case 'r': | |
325 | case 'R': | |
326 | #ifndef STANDALONE | |
327 | if ((fi = open(*argv, 2)) < 0) { | |
328 | printf("%s: cannot open\n", *argv); | |
329 | exit(1); | |
330 | } | |
331 | #else | |
332 | do { | |
333 | char charbuf[50]; | |
334 | ||
335 | printf("Disk? "); | |
336 | gets(charbuf); | |
337 | fi = open(charbuf, 2); | |
338 | } while (fi == -1); | |
339 | #endif | |
340 | #ifndef STANDALONE | |
341 | if (command == 'R') { | |
342 | printf("Enter starting volume number: "); | |
343 | if (gets(tbf) == EOF) { | |
344 | volno = 1; | |
345 | printf("\n"); | |
346 | } | |
347 | else | |
348 | volno = atoi(tbf); | |
349 | } | |
350 | else | |
351 | #endif | |
352 | volno = 1; | |
353 | printf("Last chance before scribbling on %s. ", | |
354 | #ifdef STANDALONE | |
355 | "disk"); | |
356 | #else | |
357 | *argv); | |
358 | #endif | |
359 | while (getchar() != '\n'); | |
360 | dread((daddr_t)1, (char *)&sblock, sizeof(sblock)); | |
361 | maxi = (sblock.s_isize-2)*INOPB; | |
362 | if (readhdr(&spcl) == 0) { | |
363 | printf("Missing volume record\n"); | |
364 | exit(1); | |
365 | } | |
366 | if (checkvol(&spcl, volno) == 0) { | |
367 | printf("Tape is not volume %d\n", volno); | |
368 | exit(1); | |
369 | } | |
370 | gethead(&spcl); | |
371 | for (;;) { | |
372 | ragain: | |
373 | if (ishead(&spcl) == 0) { | |
374 | printf("Missing header block\n"); | |
375 | while (gethead(&spcl) == 0) | |
376 | ; | |
377 | eflag++; | |
378 | } | |
379 | if (checktype(&spcl, TS_END) == 1) { | |
380 | printf("End of tape\n"); | |
381 | close(mt); | |
382 | dwrite( (daddr_t) 1, (char *) &sblock); | |
383 | return; | |
384 | } | |
385 | if (checktype(&spcl, TS_CLRI) == 1) { | |
386 | readbits(clrimap); | |
387 | for (ino = 1; ino <= maxi; ino++) | |
388 | if (BIT(ino, clrimap) == 0) { | |
389 | getdino(ino, &tino); | |
390 | if (tino.di_mode == 0) | |
391 | continue; | |
392 | itrunc(&tino); | |
393 | clri(&tino); | |
394 | putdino(ino, &tino); | |
395 | } | |
396 | dwrite( (daddr_t) 1, (char *) &sblock); | |
397 | goto ragain; | |
398 | } | |
399 | if (checktype(&spcl, TS_BITS) == 1) { | |
400 | readbits(dumpmap); | |
401 | goto ragain; | |
402 | } | |
403 | if (checktype(&spcl, TS_INODE) == 0) { | |
404 | printf("Unknown header type\n"); | |
405 | eflag++; | |
406 | gethead(&spcl); | |
407 | goto ragain; | |
408 | } | |
409 | ino = spcl.c_inumber; | |
410 | if (eflag) | |
411 | printf("Resynced at inode %u\n", ino); | |
412 | eflag = 0; | |
413 | if (ino > maxi) { | |
414 | printf("%u: ilist too small\n", ino); | |
415 | gethead(&spcl); | |
416 | goto ragain; | |
417 | } | |
418 | dino = spcl.c_dinode; | |
419 | getdino(ino, &tino); | |
420 | curbno = 0; | |
421 | itrunc(&tino); | |
422 | clri(&tino); | |
423 | for (i = 0; i < NADDR; i++) | |
424 | taddr[i] = 0; | |
425 | l3tol(taddr, dino.di_addr, 1); | |
426 | getfile(d, rstrfile, rstrskip, dino.di_size); | |
427 | ip = &tino; | |
428 | ltol3(ip->di_addr, taddr, NADDR); | |
429 | ip1 = &dino; | |
430 | ip->di_mode = ip1->di_mode; | |
431 | ip->di_nlink = ip1->di_nlink; | |
432 | ip->di_uid = ip1->di_uid; | |
433 | ip->di_gid = ip1->di_gid; | |
434 | ip->di_size = ip1->di_size; | |
435 | ip->di_atime = ip1->di_atime; | |
436 | ip->di_mtime = ip1->di_mtime; | |
437 | ip->di_ctime = ip1->di_ctime; | |
438 | putdino(ino, &tino); | |
439 | } | |
440 | } | |
441 | } | |
442 | ||
443 | /* | |
444 | * Read the tape, bulding up a directory structure for extraction | |
445 | * by name | |
446 | */ | |
447 | #ifndef STANDALONE | |
448 | pass1() | |
449 | { | |
450 | register i; | |
451 | struct dinode *ip; | |
452 | int putdir(), null(); | |
453 | ||
454 | while (gethead(&spcl) == 0) { | |
455 | printf("Can't find directory header!\n"); | |
456 | } | |
457 | for (;;) { | |
458 | if (checktype(&spcl, TS_BITS) == 1) { | |
459 | readbits(dumpmap); | |
460 | continue; | |
461 | } | |
462 | if (checktype(&spcl, TS_CLRI) == 1) { | |
463 | readbits(clrimap); | |
464 | continue; | |
465 | } | |
466 | if (checktype(&spcl, TS_INODE) == 0) { | |
467 | finish: | |
468 | flsh(); | |
469 | close(mt); | |
470 | return; | |
471 | } | |
472 | ip = &spcl.c_dinode; | |
473 | i = ip->di_mode & IFMT; | |
474 | if (i != IFDIR) { | |
475 | goto finish; | |
476 | } | |
477 | inotab[ipos].t_ino = spcl.c_inumber; | |
478 | inotab[ipos++].t_seekpt = seekpt; | |
479 | getfile(spcl.c_inumber, putdir, null, spcl.c_dinode.di_size); | |
480 | putent("\000\000/"); | |
481 | } | |
482 | } | |
483 | #endif | |
484 | ||
485 | /* | |
486 | * Do the file extraction, calling the supplied functions | |
487 | * with the blocks | |
488 | */ | |
489 | getfile(n, f1, f2, size) | |
490 | ino_t n; | |
491 | int (*f2)(), (*f1)(); | |
492 | long size; | |
493 | { | |
494 | register i; | |
495 | struct spcl addrblock; | |
496 | char buf[BSIZE]; | |
497 | ||
498 | addrblock = spcl; | |
499 | curino = n; | |
500 | goto start; | |
501 | for (;;) { | |
502 | if (gethead(&addrblock) == 0) { | |
503 | printf("Missing address (header) block\n"); | |
504 | goto eloop; | |
505 | } | |
506 | if (checktype(&addrblock, TS_ADDR) == 0) { | |
507 | spcl = addrblock; | |
508 | curino = 0; | |
509 | curino = 0; | |
510 | return; | |
511 | } | |
512 | start: | |
513 | for (i = 0; i < addrblock.c_count; i += 2) { | |
514 | if (addrblock.c_addr[i]) | |
515 | readtape(buf, 0); | |
516 | else | |
517 | clearbuf(buf, 0); | |
518 | if (size > OBSIZE && addrblock.c_addr[i+1]) | |
519 | readtape(buf, 1); | |
520 | else | |
521 | clearbuf(buf, 1); | |
522 | if (addrblock.c_addr[i] || size > OBSIZE && addrblock.c_addr[i + 1]) | |
523 | (*f1)(buf, size > BSIZE ? (long) BSIZE : size); | |
524 | else | |
525 | (*f2)(buf, size > BSIZE ? (long) BSIZE : size); | |
526 | if ((size -= BSIZE) <= 0) { | |
527 | eloop: | |
528 | while (gethead(&spcl) == 0) | |
529 | ; | |
530 | if (checktype(&spcl, TS_ADDR) == 1) | |
531 | goto eloop; | |
532 | curino = 0; | |
533 | return; | |
534 | } | |
535 | } | |
536 | } | |
537 | } | |
538 | ||
539 | /* | |
540 | * Do the tape i\/o, dealling with volume changes | |
541 | * etc.. | |
542 | */ | |
543 | readtape(b, part) | |
544 | char *b; | |
545 | { | |
546 | register i; | |
547 | struct spcl tmpbuf; | |
548 | ||
549 | if (bct >= NTREC) { | |
550 | for (i = 0; i < NTREC; i++) | |
551 | ((struct spcl *)&tbf[i*OBSIZE])->c_magic = 0; | |
552 | bct = 0; | |
553 | if ((i = read(mt, tbf, NTREC*OBSIZE)) < 0) { | |
554 | printf("Tape read error: inode %u\n", curino); | |
555 | eflag++; | |
556 | exit(1); | |
557 | } | |
558 | if (i == 0) { | |
559 | bct = NTREC + 1; | |
560 | volno++; | |
561 | loop: | |
562 | flsht(); | |
563 | close(mt); | |
564 | printf("Mount volume %d\n", volno); | |
565 | while (getchar() != '\n') | |
566 | ; | |
567 | if ((mt = open(magtape, 0)) == -1) { | |
568 | printf("Cannot open tape!\n"); | |
569 | goto loop; | |
570 | } | |
571 | if (readhdr(&tmpbuf) == 0) { | |
572 | printf("Not a dump tape.Try again\n"); | |
573 | goto loop; | |
574 | } | |
575 | if (checkvol(&tmpbuf, volno) == 0) { | |
576 | printf("Wrong tape. Try again\n"); | |
577 | goto loop; | |
578 | } | |
579 | readtape(b, part); | |
580 | return; | |
581 | } | |
582 | } | |
583 | copy(&tbf[(bct++*OBSIZE)], b + part * OBSIZE, OBSIZE); | |
584 | } | |
585 | ||
586 | flsht() | |
587 | { | |
588 | bct = NTREC+1; | |
589 | } | |
590 | ||
591 | copy(f, t, s) | |
592 | register char *f, *t; | |
593 | { | |
594 | register i; | |
595 | ||
596 | i = s; | |
597 | do | |
598 | *t++ = *f++; | |
599 | while (--i); | |
600 | } | |
601 | ||
602 | clearbuf(cp, part) | |
603 | register char *cp; | |
604 | { | |
605 | register i; | |
606 | ||
607 | cp += part * OBSIZE; | |
608 | i = OBSIZE; | |
609 | do | |
610 | *cp++ = 0; | |
611 | while (--i); | |
612 | } | |
613 | ||
614 | /* | |
615 | * Put and get the directory entries from the compressed | |
616 | * directory file | |
617 | */ | |
618 | #ifndef STANDALONE | |
619 | putent(cp) | |
620 | char *cp; | |
621 | { | |
622 | register i; | |
623 | ||
624 | for (i = 0; i < sizeof(ino_t); i++) | |
625 | writec(*cp++); | |
626 | for (i = 0; i < DIRSIZ; i++) { | |
627 | writec(*cp); | |
628 | if (*cp++ == 0) | |
629 | return; | |
630 | } | |
631 | return; | |
632 | } | |
633 | ||
634 | getent(bf) | |
635 | register char *bf; | |
636 | { | |
637 | register i; | |
638 | ||
639 | for (i = 0; i < sizeof(ino_t); i++) | |
640 | *bf++ = readc(); | |
641 | for (i = 0; i < DIRSIZ; i++) | |
642 | if ((*bf++ = readc()) == 0) | |
643 | return; | |
644 | return; | |
645 | } | |
646 | ||
647 | /* | |
648 | * read/write te directory file | |
649 | */ | |
650 | writec(c) | |
651 | char c; | |
652 | { | |
653 | drblock[bpt++] = c; | |
654 | seekpt++; | |
655 | if (bpt >= BSIZE) { | |
656 | bpt = 0; | |
657 | write(df, drblock, BSIZE); | |
658 | } | |
659 | } | |
660 | ||
661 | readc() | |
662 | { | |
663 | if (bpt >= BSIZE) { | |
664 | read(df, drblock, BSIZE); | |
665 | bpt = 0; | |
666 | } | |
667 | return(drblock[bpt++]); | |
668 | } | |
669 | ||
670 | mseek(pt) | |
671 | daddr_t pt; | |
672 | { | |
673 | bpt = BSIZE; | |
674 | lseek(df, pt, 0); | |
675 | } | |
676 | ||
677 | flsh() | |
678 | { | |
679 | write(df, drblock, bpt+1); | |
680 | } | |
681 | ||
682 | /* | |
683 | * search the directory inode ino | |
684 | * looking for entry cp | |
685 | */ | |
686 | ino_t | |
687 | search(inum, cp) | |
688 | ino_t inum; | |
689 | char *cp; | |
690 | { | |
691 | register i; | |
692 | struct direct dir; | |
693 | ||
694 | for (i = 0; i < MAXINO; i++) | |
695 | if (inotab[i].t_ino == inum) { | |
696 | goto found; | |
697 | } | |
698 | return(0); | |
699 | found: | |
700 | mseek(inotab[i].t_seekpt); | |
701 | do { | |
702 | getent((char *)&dir); | |
703 | if (direq(dir.d_name, "/")) | |
704 | return(0); | |
705 | } while (direq(dir.d_name, cp) == 0); | |
706 | return(dir.d_ino); | |
707 | } | |
708 | ||
709 | /* | |
710 | * Search the directory tree rooted at inode 2 | |
711 | * for the path pointed at by n | |
712 | */ | |
713 | psearch(n) | |
714 | char *n; | |
715 | { | |
716 | register char *cp, *cp1; | |
717 | char c; | |
718 | ||
719 | ino = 2; | |
720 | if (*(cp = n) == '/') | |
721 | cp++; | |
722 | next: | |
723 | cp1 = cp + 1; | |
724 | while (*cp1 != '/' && *cp1) | |
725 | cp1++; | |
726 | c = *cp1; | |
727 | *cp1 = 0; | |
728 | ino = search(ino, cp); | |
729 | if (ino == 0) { | |
730 | *cp1 = c; | |
731 | return(0); | |
732 | } | |
733 | *cp1 = c; | |
734 | if (c == '/') { | |
735 | cp = cp1+1; | |
736 | goto next; | |
737 | } | |
738 | return(ino); | |
739 | } | |
740 | ||
741 | direq(s1, s2) | |
742 | register char *s1, *s2; | |
743 | { | |
744 | register i; | |
745 | ||
746 | for (i = 0; i < DIRSIZ; i++) | |
747 | if (*s1++ == *s2) { | |
748 | if (*s2++ == 0) | |
749 | return(1); | |
750 | } else | |
751 | return(0); | |
752 | return(1); | |
753 | } | |
754 | #endif | |
755 | ||
756 | /* | |
757 | * read/write a disk block, be sure to update the buffer | |
758 | * cache if needed. | |
759 | */ | |
760 | dwrite(bno, b) | |
761 | daddr_t bno; | |
762 | char *b; | |
763 | { | |
764 | register i; | |
765 | ||
766 | for (i = 0; i < NCACHE; i++) { | |
767 | if (cache[i].c_bno == bno) { | |
768 | copy(b, cache[i].c_block, BSIZE); | |
769 | cache[i].c_time = 0; | |
770 | break; | |
771 | } | |
772 | else | |
773 | cache[i].c_time++; | |
774 | } | |
775 | lseek(fi, bno*BSIZE, 0); | |
776 | if(write(fi, b, BSIZE) != BSIZE) { | |
777 | #ifdef STANDALONE | |
778 | printf("disk write error %D\n", bno); | |
779 | #else | |
780 | fprintf(stderr, "disk write error %ld\n", bno); | |
781 | #endif | |
782 | exit(1); | |
783 | } | |
784 | } | |
785 | ||
786 | dread(bno, buf, cnt) | |
787 | daddr_t bno; | |
788 | char *buf; | |
789 | { | |
790 | register i, j; | |
791 | ||
792 | j = 0; | |
793 | for (i = 0; i < NCACHE; i++) { | |
794 | if (++curcache >= NCACHE) | |
795 | curcache = 0; | |
796 | if (cache[curcache].c_bno == bno) { | |
797 | copy(cache[curcache].c_block, buf, cnt); | |
798 | cache[curcache].c_time = 0; | |
799 | return; | |
800 | } | |
801 | else { | |
802 | cache[curcache].c_time++; | |
803 | if (cache[j].c_time < cache[curcache].c_time) | |
804 | j = curcache; | |
805 | } | |
806 | } | |
807 | ||
808 | lseek(fi, bno*BSIZE, 0); | |
809 | if (read(fi, cache[j].c_block, BSIZE) != BSIZE) { | |
810 | #ifdef STANDALONE | |
811 | printf("read error %D\n", bno); | |
812 | #else | |
813 | printf("read error %ld\n", bno); | |
814 | #endif | |
815 | exit(1); | |
816 | } | |
817 | copy(cache[j].c_block, buf, cnt); | |
818 | cache[j].c_time = 0; | |
819 | cache[j].c_bno = bno; | |
820 | } | |
821 | ||
822 | /* | |
823 | * the inode manpulation routines. Like the system. | |
824 | * | |
825 | * clri zeros the inode | |
826 | */ | |
827 | clri(ip) | |
828 | struct dinode *ip; | |
829 | { | |
830 | int i, *p; | |
831 | i = sizeof(struct dinode)/sizeof(int); | |
832 | p = (int *)ip; | |
833 | do | |
834 | *p++ = 0; | |
835 | while(--i); | |
836 | } | |
837 | ||
838 | /* | |
839 | * itrunc/tloop/bfree free all of the blocks pointed at by the inode | |
840 | */ | |
841 | itrunc(ip) | |
842 | register struct dinode *ip; | |
843 | { | |
844 | register i; | |
845 | daddr_t bn, iaddr[NADDR]; | |
846 | ||
847 | if (ip->di_mode == 0) | |
848 | return; | |
849 | i = ip->di_mode & IFMT; | |
850 | if (i != IFDIR && i != IFREG) | |
851 | return; | |
852 | l3tol(iaddr, ip->di_addr, NADDR); | |
853 | for(i=NADDR-1;i>=0;i--) { | |
854 | bn = iaddr[i]; | |
855 | if(bn == 0) continue; | |
856 | switch(i) { | |
857 | ||
858 | default: | |
859 | bfree(bn); | |
860 | break; | |
861 | ||
862 | case NADDR-3: | |
863 | tloop(bn, 0, 0); | |
864 | break; | |
865 | ||
866 | case NADDR-2: | |
867 | tloop(bn, 1, 0); | |
868 | break; | |
869 | ||
870 | case NADDR-1: | |
871 | tloop(bn, 1, 1); | |
872 | } | |
873 | } | |
874 | ip->di_size = 0; | |
875 | } | |
876 | ||
877 | tloop(bn, f1, f2) | |
878 | daddr_t bn; | |
879 | int f1, f2; | |
880 | { | |
881 | register i; | |
882 | daddr_t nb; | |
883 | union { | |
884 | char data[BSIZE]; | |
885 | daddr_t indir[NINDIR]; | |
886 | } ibuf; | |
887 | ||
888 | dread(bn, ibuf.data, BSIZE); | |
889 | for(i=NINDIR-1;i>=0;i--) { | |
890 | nb = ibuf.indir[i]; | |
891 | if(nb) { | |
892 | if(f1) | |
893 | tloop(nb, f2, 0); | |
894 | else | |
895 | bfree(nb); | |
896 | } | |
897 | } | |
898 | bfree(bn); | |
899 | } | |
900 | ||
901 | bfree(bn) | |
902 | daddr_t bn; | |
903 | { | |
904 | register i; | |
905 | union { | |
906 | char data[BSIZE]; | |
907 | struct fblk frees; | |
908 | } fbuf; | |
909 | ||
910 | if(sblock.s_nfree >= NICFREE) { | |
911 | fbuf.df_nfree = sblock.s_nfree; | |
912 | for(i=0;i<NICFREE;i++) | |
913 | fbuf.df_free[i] = sblock.s_free[i]; | |
914 | sblock.s_nfree = 0; | |
915 | dwrite(bn, fbuf.data); | |
916 | } | |
917 | sblock.s_free[sblock.s_nfree++] = bn; | |
918 | } | |
919 | ||
920 | /* | |
921 | * allocate a block off the free list. | |
922 | */ | |
923 | daddr_t | |
924 | balloc() | |
925 | { | |
926 | daddr_t bno; | |
927 | register i; | |
928 | static char zeroes[BSIZE]; | |
929 | union { | |
930 | char data[BSIZE]; | |
931 | struct fblk frees; | |
932 | } fbuf; | |
933 | ||
934 | if(sblock.s_nfree == 0 || (bno=sblock.s_free[--sblock.s_nfree]) == 0) { | |
935 | #ifdef STANDALONE | |
936 | printf("Out of space\n"); | |
937 | #else | |
938 | fprintf(stderr, "Out of space.\n"); | |
939 | #endif | |
940 | exit(1); | |
941 | } | |
942 | if(sblock.s_nfree == 0) { | |
943 | dread(bno, fbuf.data, BSIZE); | |
944 | sblock.s_nfree = fbuf.df_nfree; | |
945 | for(i=0;i<NICFREE;i++) | |
946 | sblock.s_free[i] = fbuf.df_free[i]; | |
947 | } | |
948 | dwrite(bno, zeroes); | |
949 | return(bno); | |
950 | } | |
951 | ||
952 | /* | |
953 | * map a block number into a block address, ensuring | |
954 | * all of the correct indirect blocks are around. Allocate | |
955 | * the block requested. | |
956 | */ | |
957 | daddr_t | |
958 | bmap(iaddr, bn) | |
959 | daddr_t iaddr[NADDR]; | |
960 | daddr_t bn; | |
961 | { | |
962 | register i; | |
963 | int j, sh; | |
964 | daddr_t nb, nnb; | |
965 | daddr_t indir[NINDIR]; | |
966 | ||
967 | /* | |
968 | * blocks 0..NADDR-4 are direct blocks | |
969 | */ | |
970 | if(bn < NADDR-3) { | |
971 | iaddr[bn] = nb = balloc(); | |
972 | return(nb); | |
973 | } | |
974 | ||
975 | /* | |
976 | * addresses NADDR-3, NADDR-2, and NADDR-1 | |
977 | * have single, double, triple indirect blocks. | |
978 | * the first step is to determine | |
979 | * how many levels of indirection. | |
980 | */ | |
981 | sh = 0; | |
982 | nb = 1; | |
983 | bn -= NADDR-3; | |
984 | for(j=3; j>0; j--) { | |
985 | sh += NSHIFT; | |
986 | nb <<= NSHIFT; | |
987 | if(bn < nb) | |
988 | break; | |
989 | bn -= nb; | |
990 | } | |
991 | if(j == 0) { | |
992 | return((daddr_t)0); | |
993 | } | |
994 | ||
995 | /* | |
996 | * fetch the address from the inode | |
997 | */ | |
998 | if((nb = iaddr[NADDR-j]) == 0) { | |
999 | iaddr[NADDR-j] = nb = balloc(); | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * fetch through the indirect blocks | |
1004 | */ | |
1005 | for(; j<=3; j++) { | |
1006 | dread(nb, (char *)indir, BSIZE); | |
1007 | sh -= NSHIFT; | |
1008 | i = (bn>>sh) & NMASK; | |
1009 | nnb = indir[i]; | |
1010 | if(nnb == 0) { | |
1011 | nnb = balloc(); | |
1012 | indir[i] = nnb; | |
1013 | dwrite(nb, (char *)indir); | |
1014 | } | |
1015 | nb = nnb; | |
1016 | } | |
1017 | return(nb); | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * read the tape into buf, then return whether or | |
1022 | * or not it is a header block. | |
1023 | */ | |
1024 | gethead(buf) | |
1025 | struct spcl *buf; | |
1026 | { | |
1027 | readtape((char *)buf, 0); | |
1028 | if (buf->c_magic != MAGIC || checksum((int *) buf) == 0) | |
1029 | return(0); | |
1030 | return(1); | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * return whether or not the buffer contains a header block | |
1035 | */ | |
1036 | ishead(buf) | |
1037 | struct spcl *buf; | |
1038 | { | |
1039 | if (buf->c_magic != MAGIC || checksum((int *) buf) == 0) | |
1040 | return(0); | |
1041 | return(1); | |
1042 | } | |
1043 | ||
1044 | checktype(b, t) | |
1045 | struct spcl *b; | |
1046 | int t; | |
1047 | { | |
1048 | return(b->c_type == t); | |
1049 | } | |
1050 | ||
1051 | ||
1052 | checksum(b) | |
1053 | int *b; | |
1054 | { | |
1055 | register i, j; | |
1056 | ||
1057 | j = OBSIZE/sizeof(int); | |
1058 | i = 0; | |
1059 | do | |
1060 | i += *b++; | |
1061 | while (--j); | |
1062 | if (i != CHECKSUM) { | |
1063 | printf("Checksum error %o\n", i); | |
1064 | return(0); | |
1065 | } | |
1066 | return(1); | |
1067 | } | |
1068 | ||
1069 | checkvol(b, t) | |
1070 | struct spcl *b; | |
1071 | int t; | |
1072 | { | |
1073 | if (b->c_volume == t) | |
1074 | return(1); | |
1075 | return(0); | |
1076 | } | |
1077 | ||
1078 | readhdr(b) | |
1079 | struct spcl *b; | |
1080 | { | |
1081 | if (gethead(b) == 0) | |
1082 | return(0); | |
1083 | if (checktype(b, TS_TAPE) == 0) | |
1084 | return(0); | |
1085 | return(1); | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * The next routines are called during file extraction to | |
1090 | * put the data into the right form and place. | |
1091 | */ | |
1092 | #ifndef STANDALONE | |
1093 | xtrfile(b, size) | |
1094 | char *b; | |
1095 | long size; | |
1096 | { | |
1097 | write(ofile, b, (int) size); | |
1098 | } | |
1099 | ||
1100 | null() {;} | |
1101 | ||
1102 | skip() | |
1103 | { | |
1104 | lseek(ofile, (long) OBSIZE, 1); | |
1105 | } | |
1106 | #endif | |
1107 | ||
1108 | ||
1109 | rstrfile(b, s) | |
1110 | char *b; | |
1111 | long s; | |
1112 | { | |
1113 | daddr_t d; | |
1114 | ||
1115 | d = bmap(taddr, curbno); | |
1116 | dwrite(d, b); | |
1117 | curbno += 1; | |
1118 | } | |
1119 | ||
1120 | rstrskip(b, s) | |
1121 | char *b; | |
1122 | long s; | |
1123 | { | |
1124 | curbno += 1; | |
1125 | } | |
1126 | ||
1127 | #ifndef STANDALONE | |
1128 | putdir(b) | |
1129 | char *b; | |
1130 | { | |
1131 | register struct direct *dp; | |
1132 | register i; | |
1133 | ||
1134 | for (dp = (struct direct *) b, i = 0; i < BSIZE; dp++, i += sizeof(*dp)) { | |
1135 | if (dp->d_ino == 0) | |
1136 | continue; | |
1137 | putent((char *) dp); | |
1138 | } | |
1139 | } | |
1140 | #endif | |
1141 | ||
1142 | /* | |
1143 | * read/write an inode from the disk | |
1144 | */ | |
1145 | getdino(inum, b) | |
1146 | ino_t inum; | |
1147 | struct dinode *b; | |
1148 | { | |
1149 | daddr_t bno; | |
1150 | char buf[BSIZE]; | |
1151 | ||
1152 | bno = (ino - 1)/INOPB; | |
1153 | bno += 2; | |
1154 | dread(bno, buf, BSIZE); | |
1155 | copy(&buf[((inum-1)%INOPB)*sizeof(struct dinode)], (char *) b, sizeof(struct dinode)); | |
1156 | } | |
1157 | ||
1158 | putdino(inum, b) | |
1159 | ino_t inum; | |
1160 | struct dinode *b; | |
1161 | { | |
1162 | daddr_t bno; | |
1163 | char buf[BSIZE]; | |
1164 | ||
1165 | bno = ((ino - 1)/INOPB) + 2; | |
1166 | dread(bno, buf, BSIZE); | |
1167 | copy((char *) b, &buf[((inum-1)%INOPB)*sizeof(struct dinode)], sizeof(struct dinode)); | |
1168 | dwrite(bno, buf); | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * read a bit mask from the tape into m. | |
1173 | */ | |
1174 | readbits(m) | |
1175 | short *m; | |
1176 | { | |
1177 | register i; | |
1178 | ||
1179 | i = spcl.c_count; | |
1180 | ||
1181 | while (i--) { | |
1182 | readtape((char *) m, 0); | |
1183 | m += (OBSIZE/(MLEN/BITS)); | |
1184 | } | |
1185 | while (gethead(&spcl) == 0) | |
1186 | ; | |
1187 | } | |
1188 | ||
1189 | done() | |
1190 | { | |
1191 | unlink(dirfile); | |
1192 | exit(0); | |
1193 | } |