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Fix some compile warnings.
[dump.git] / dump / tape.c
1 /*
2 * Ported to Linux's Second Extended File System as part of the
3 * dump and restore backup suit
4 * Remy Card <card@Linux.EU.Org>, 1994-1997
5 * Stelian Pop <stelian@popies.net>, 1999-2000
6 * Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
7 */
8
9 /*-
10 * Copyright (c) 1980, 1991, 1993
11 * The Regents of the University of California. All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #ifndef lint
39 static const char rcsid[] =
40 "$Id: tape.c,v 1.83 2004/04/21 09:15:08 stelian Exp $";
41 #endif /* not lint */
42
43 #include <config.h>
44 #include <compatlfs.h>
45 #include <errno.h>
46 #include <fcntl.h>
47 #include <setjmp.h>
48 #include <signal.h>
49 #include <stdio.h>
50 #include <compaterr.h>
51 #include <system.h>
52 #ifdef __STDC__
53 #include <stdlib.h>
54 #include <string.h>
55 #include <unistd.h>
56 #else
57 int write(), read();
58 #endif
59
60 #ifdef __linux__
61 #include <sys/types.h>
62 #include <sys/time.h>
63 #include <linux/fs.h> /* for definition of BLKFLSBUF */
64 #include <time.h>
65 #endif
66 #include <sys/param.h>
67 #include <sys/socket.h>
68 #include <sys/wait.h>
69 #include <sys/mtio.h>
70 #ifdef __linux__
71 #ifdef HAVE_EXT2FS_EXT2_FS_H
72 #include <ext2fs/ext2_fs.h>
73 #else
74 #include <linux/ext2_fs.h>
75 #endif
76 #include <ext2fs/ext2fs.h>
77 #include <sys/stat.h>
78 #include <bsdcompat.h>
79 #elif defined sunos
80 #include <sys/vnode.h>
81
82 #include <ufs/fs.h>
83 #include <ufs/inode.h>
84 #else
85 #include <ufs/ufs/dinode.h>
86 #include <ufs/ffs/fs.h>
87 #endif /* __linux__ */
88
89 #include <protocols/dumprestore.h>
90
91 #ifdef HAVE_ZLIB
92 #include <zlib.h>
93 #endif /* HAVE_ZLIB */
94
95 #ifdef HAVE_BZLIB
96 #include <bzlib.h>
97 #endif /* HAVE_BZLIB */
98
99 #ifdef HAVE_LZO
100 #include <minilzo.h>
101 #endif /* HAVE_LZO */
102
103 #include "dump.h"
104
105 int writesize; /* size of malloc()ed buffer for tape */
106 long lastspclrec = -1; /* tape block number of last written header */
107 int trecno = 0; /* next record to write in current block */
108 extern long *blocksperfiles; /* number of blocks per output file(s) */
109 long blocksperfiles_current; /* current position in blocksperfiles */
110 long blocksthisvol; /* number of blocks on current output file */
111 extern int ntrec; /* blocking factor on tape */
112 extern int cartridge;
113 char *nexttape;
114 extern pid_t rshpid;
115 int eot_code = 1;
116 long long tapea_bytes = 0; /* bytes_written at start of current volume */
117 static int magtapeout; /* output is really a tape */
118
119 static ssize_t dump_atomic_read __P((int, void *, size_t));
120 static ssize_t dump_atomic_write __P((int, const void *, size_t));
121 #ifdef WRITEDEBUG
122 static void doslave __P((int, int, int));
123 #else
124 static void doslave __P((int, int));
125 #endif
126 static void enslave __P((void));
127 static void flushtape __P((void));
128 static void killall __P((void));
129 static void rollforward __P((void));
130 #ifdef USE_QFA
131 static int GetTapePos __P((long long *));
132 static int MkTapeString __P((struct s_spcl *, long long));
133 #define FILESQFAPOS 20
134 #endif
135
136 /*
137 * Concurrent dump mods (Caltech) - disk block reading and tape writing
138 * are exported to several slave processes. While one slave writes the
139 * tape, the others read disk blocks; they pass control of the tape in
140 * a ring via signals. The parent process traverses the filesystem and
141 * sends writeheader()'s and lists of daddr's to the slaves via pipes.
142 * The following structure defines the instruction packets sent to slaves.
143 */
144 struct req {
145 daddr_t dblk;
146 int count;
147 };
148 int reqsiz;
149
150 struct slave_results {
151 ssize_t unclen; /* uncompressed length */
152 ssize_t clen; /* compressed length */
153 };
154
155 #define SLAVES 3 /* 1 slave writing, 1 reading, 1 for slack */
156 struct slave {
157 int tapea; /* header number at start of this chunk */
158 int count; /* count to next header (used for TS_TAPE */
159 /* after EOT) */
160 int inode; /* inode that we are currently dealing with */
161 int fd; /* FD for this slave */
162 int pid; /* PID for this slave */
163 int sent; /* 1 == we've sent this slave requests */
164 int firstrec; /* record number of this block */
165 char (*tblock)[TP_BSIZE]; /* buffer for data blocks */
166 struct req *req; /* buffer for requests */
167 } slaves[SLAVES+1];
168 struct slave *slp;
169
170 char (*nextblock)[TP_BSIZE];
171
172 static time_t tstart_volume; /* time of volume start */
173 static int tapea_volume; /* value of spcl.c_tapea at volume start */
174
175 int master; /* pid of master, for sending error signals */
176 int tenths; /* length of tape overhead per block written */
177 static int caught; /* have we caught the signal to proceed? */
178 static int ready; /* have we reached the lock point without having */
179 /* received the SIGUSR2 signal from the prev slave? */
180 static sigjmp_buf jmpbuf; /* where to jump to if we are ready when the */
181 /* SIGUSR2 arrives from the previous slave */
182 #ifdef USE_QFA
183 static int gtperr = 0;
184 #endif
185
186 int
187 alloctape(void)
188 {
189 int pgoff = getpagesize() - 1;
190 char *buf;
191 int i;
192
193 writesize = ntrec * TP_BSIZE;
194 reqsiz = (ntrec + 1) * sizeof(struct req);
195 /*
196 * CDC 92181's and 92185's make 0.8" gaps in 1600-bpi start/stop mode
197 * (see DEC TU80 User's Guide). The shorter gaps of 6250-bpi require
198 * repositioning after stopping, i.e, streaming mode, where the gap is
199 * variable, 0.30" to 0.45". The gap is maximal when the tape stops.
200 */
201 if (!blocksperfiles && !unlimited)
202 tenths = (cartridge ? 16 : density == 625 ? 5 : 8);
203 else {
204 tenths = 0;
205 density = 1;
206 }
207 /*
208 * Allocate tape buffer contiguous with the array of instruction
209 * packets, so flushtape() can write them together with one write().
210 * Align tape buffer on page boundary to speed up tape write().
211 */
212 for (i = 0; i <= SLAVES; i++) {
213 buf = (char *)
214 malloc((unsigned)(reqsiz + writesize + pgoff + TP_BSIZE));
215 if (buf == NULL)
216 return(0);
217 slaves[i].tblock = (char (*)[TP_BSIZE])
218 #ifdef __linux__
219 (((long)&buf[reqsiz] + pgoff) &~ pgoff);
220 #else
221 (((long)&buf[ntrec + 1] + pgoff) &~ pgoff);
222 #endif
223 slaves[i].req = (struct req *)slaves[i].tblock - ntrec - 1;
224 }
225 slp = &slaves[0];
226 slp->count = 1;
227 slp->tapea = 0;
228 slp->firstrec = 0;
229 nextblock = slp->tblock;
230 return(1);
231 }
232
233 void
234 writerec(const void *dp, int isspcl)
235 {
236
237 slp->req[trecno].dblk = (daddr_t)0;
238 slp->req[trecno].count = 1;
239 /* XXX post increment triggers an egcs-1.1.2-12 bug on alpha/sparc */
240 *(union u_spcl *)(*(nextblock)) = *(union u_spcl *)dp;
241
242 /* Need to write it to the archive file */
243 if (! AfileActive && isspcl && (spcl.c_type == TS_END))
244 AfileActive = 1;
245 if (AfileActive && Afile >= 0) {
246 /* When we dump an inode which is not a directory,
247 * it means we ended the archive contents */
248 if (isspcl && (spcl.c_type == TS_INODE) &&
249 ((spcl.c_dinode.di_mode & S_IFMT) != IFDIR))
250 AfileActive = 0;
251 else {
252 union u_spcl tmp;
253 tmp = *(union u_spcl *)dp;
254 /* Write the record, _uncompressed_ */
255 if (isspcl) {
256 tmp.s_spcl.c_flags &= ~DR_COMPRESSED;
257 mkchecksum(&tmp);
258 }
259 if (write(Afile, &tmp, TP_BSIZE) != TP_BSIZE)
260 msg("error writing archive file: %s\n",
261 strerror(errno));
262 }
263 }
264
265 nextblock++;
266 if (isspcl)
267 lastspclrec = spcl.c_tapea;
268 trecno++;
269 spcl.c_tapea++;
270 if (trecno >= ntrec)
271 flushtape();
272 }
273
274 void
275 dumpblock(daddr_t blkno, int size)
276 {
277 int avail, tpblks, dblkno;
278
279 dblkno = fsbtodb(sblock, blkno);
280 tpblks = size >> tp_bshift;
281 while ((avail = MIN(tpblks, ntrec - trecno)) > 0) {
282 slp->req[trecno].dblk = dblkno;
283 slp->req[trecno].count = avail;
284 trecno += avail;
285 spcl.c_tapea += avail;
286 if (trecno >= ntrec)
287 flushtape();
288 dblkno += avail << (tp_bshift - dev_bshift);
289 tpblks -= avail;
290 }
291 }
292
293 int nogripe = 0;
294
295 static void
296 tperror(int errnum)
297 {
298
299 if (pipeout) {
300 msg("write error on %s: %s\n", tape, strerror(errnum));
301 quit("Cannot recover\n");
302 /* NOTREACHED */
303 }
304 msg("write error %d blocks into volume %d: %s\n",
305 blocksthisvol, tapeno, strerror(errnum));
306 broadcast("DUMP WRITE ERROR!\n");
307 if (query("Do you want to rewrite this volume?")) {
308 msg("Closing this volume. Prepare to restart with new media;\n");
309 msg("this dump volume will be rewritten.\n");
310 killall();
311 nogripe = 1;
312 close_rewind();
313 Exit(X_REWRITE);
314 }
315 if (query("Do you want to start the next tape?"))
316 return;
317 dumpabort(0);
318 }
319
320 static void
321 sigpipe(UNUSED(int signo))
322 {
323
324 quit("Broken pipe\n");
325 }
326
327 /*
328 * do_stats --
329 * Update xferrate stats
330 */
331 time_t
332 do_stats(void)
333 {
334 time_t tnow, ttaken;
335 int blocks;
336
337 tnow = time(NULL);
338 ttaken = tnow - tstart_volume;
339 blocks = spcl.c_tapea - tapea_volume;
340 msg("Volume %d completed at: %s", tapeno, ctime(&tnow));
341 if (! compressed)
342 msg("Volume %d %ld blocks (%.2fMB)\n", tapeno,
343 blocks, ((double)blocks * TP_BSIZE / 1048576));
344 if (ttaken > 0) {
345 long volkb = (bytes_written - tapea_bytes) / 1024;
346 long txfrate = volkb / ttaken;
347 msg("Volume %d took %d:%02d:%02d\n", tapeno,
348 ttaken / 3600, (ttaken % 3600) / 60, ttaken % 60);
349 msg("Volume %d transfer rate: %ld kB/s\n", tapeno,
350 txfrate);
351 xferrate += txfrate;
352 if (compressed) {
353 double rate = .0005 + (double) blocks / (double) volkb;
354 msg("Volume %d %ldkB uncompressed, %ldkB compressed,"
355 " %1.3f:1\n",
356 tapeno, blocks, volkb, rate);
357 }
358 }
359 return(tnow);
360 }
361
362 char *
363 mktimeest(time_t tnow)
364 {
365 static char msgbuf[128];
366 time_t deltat;
367
368 msgbuf[0] = '\0';
369
370 if (blockswritten < 500)
371 return NULL;
372 if (blockswritten > tapesize)
373 tapesize = blockswritten;
374 deltat = tstart_writing - tnow + (1.0 * (tnow - tstart_writing))
375 / blockswritten * tapesize;
376 if (tnow > tstart_volume)
377 (void)snprintf(msgbuf, sizeof(msgbuf),
378 "%3.2f%% done at %ld kB/s, finished in %d:%02d\n",
379 (blockswritten * 100.0) / tapesize,
380 (spcl.c_tapea - tapea_volume) / (tnow - tstart_volume),
381 (int)(deltat / 3600), (int)((deltat % 3600) / 60));
382 else
383 (void)snprintf(msgbuf, sizeof(msgbuf),
384 "%3.2f%% done, finished in %d:%02d\n",
385 (blockswritten * 100.0) / tapesize,
386 (int)(deltat / 3600), (int)((deltat % 3600) / 60));
387
388 return msgbuf;
389 }
390
391 #if defined(SIGINFO)
392 /*
393 * statussig --
394 * information message upon receipt of SIGINFO
395 */
396 void
397 statussig(int notused)
398 {
399 int save_errno = errno;
400 char *buf;
401
402 buf = mktimeest(time(NULL));
403 if (buf)
404 write(STDERR_FILENO, buf, strlen(buf));
405 errno = save_errno;
406 }
407 #endif
408
409 static void
410 flushtape(void)
411 {
412 int i, blks, got;
413 long lastfirstrec;
414 struct slave_results returned;
415
416 int siz = (char *)nextblock - (char *)slp->req;
417
418 slp->req[trecno].count = 0; /* Sentinel */
419
420 if (dump_atomic_write( slp->fd, (char *)slp->req, siz) != siz)
421 quit("error writing command pipe: %s\n", strerror(errno));
422 slp->sent = 1; /* we sent a request, read the response later */
423
424 lastfirstrec = slp->firstrec;
425
426 if (++slp >= &slaves[SLAVES])
427 slp = &slaves[0];
428
429 /* Read results back from next slave */
430 if (slp->sent) {
431 if (dump_atomic_read( slp->fd, (char *)&returned, sizeof returned)
432 != sizeof returned) {
433 perror(" DUMP: error reading command pipe in master");
434 dumpabort(0);
435 }
436 got = returned.unclen;
437 bytes_written += returned.clen;
438 if (returned.unclen == returned.clen)
439 uncomprblks++;
440 slp->sent = 0;
441
442 /* Check for errors or end of tape */
443 if (got <= 0) {
444 /* Check for errors */
445 if (got < 0)
446 tperror(-got);
447 else
448 msg("End of tape detected\n");
449
450 /*
451 * Drain the results, don't care what the values were.
452 * If we read them here then trewind won't...
453 */
454 for (i = 0; i < SLAVES; i++) {
455 if (slaves[i].sent) {
456 if (dump_atomic_read( slaves[i].fd,
457 (char *)&returned, sizeof returned)
458 != sizeof returned) {
459 perror(" DUMP: error reading command pipe in master");
460 dumpabort(0);
461 }
462 slaves[i].sent = 0;
463 }
464 }
465
466 close_rewind();
467 rollforward();
468 return;
469 }
470 }
471
472 blks = 0;
473 if (spcl.c_type != TS_END) {
474 for (i = 0; i < spcl.c_count; i++)
475 if (spcl.c_addr[i] != 0)
476 blks++;
477 }
478 slp->count = lastspclrec + blks + 1 - spcl.c_tapea;
479 slp->tapea = spcl.c_tapea;
480 slp->firstrec = lastfirstrec + ntrec;
481 slp->inode = curino;
482 nextblock = slp->tblock;
483 trecno = 0;
484 asize += tenths + returned.clen / density;
485 blockswritten += ntrec;
486 blocksthisvol += ntrec;
487 if (!pipeout && !unlimited) {
488 if (blocksperfiles && blocksperfiles[blocksperfiles_current]) {
489 if ( compressed ? (bytes_written - tapea_bytes + SLAVES * (writesize + sizeof(struct tapebuf))) >= (((long long)blocksperfiles[blocksperfiles_current]) * 1024)
490 : blocksthisvol >= blocksperfiles[blocksperfiles_current] ) {
491 close_rewind();
492 startnewtape(0);
493 }
494 }
495 else if (asize > tsize) {
496 close_rewind();
497 startnewtape(0);
498 }
499 }
500 timeest();
501 }
502
503 time_t
504 trewind(void)
505 {
506 int f;
507 int got;
508 struct slave_results returned;
509
510 for (f = 0; f < SLAVES; f++) {
511 /*
512 * Drain the results, but unlike EOT we DO (or should) care
513 * what the return values were, since if we detect EOT after
514 * we think we've written the last blocks to the tape anyway,
515 * we have to replay those blocks with rollforward.
516 *
517 * fixme: punt for now.
518 */
519 if (slaves[f].sent) {
520 if (dump_atomic_read( slaves[f].fd, (char *)&returned, sizeof returned)
521 != sizeof returned) {
522 perror(" DUMP: error reading command pipe in master");
523 dumpabort(0);
524 }
525 got = returned.unclen;
526 bytes_written += returned.clen;
527 if (returned.unclen == returned.clen)
528 uncomprblks++;
529 slaves[f].sent = 0;
530
531 if (got < 0)
532 tperror(-got);
533
534 if (got == 0) {
535 msg("EOT detected in last 2 tape records!\n");
536 msg("Use a longer tape, decrease the size estimate\n");
537 quit("or use no size estimate at all.\n");
538 }
539 }
540 (void) close(slaves[f].fd);
541 }
542 while (wait((int *)NULL) >= 0) /* wait for any signals from slaves */
543 /* void */;
544
545 if (!pipeout) {
546
547 msg("Closing %s\n", tape);
548
549 #ifdef RDUMP
550 if (host) {
551 rmtclose();
552 while (rmtopen(tape, O_RDONLY) < 0)
553 sleep(10);
554 rmtclose();
555 }
556 else
557 #endif
558 {
559 (void) close(tapefd);
560 if (!fifoout) {
561 while ((f = OPEN(tape, O_RDONLY)) < 0)
562 sleep (10);
563 (void) close(f);
564 }
565 }
566 }
567 return do_stats();
568 }
569
570
571 void
572 close_rewind(void)
573 {
574 int eot_code = 1;
575 (void)trewind();
576 if (eot_script) {
577 msg("Launching %s\n", eot_script);
578 eot_code = system_command(eot_script, tape, tapeno);
579 }
580 if (eot_code != 0 && eot_code != 1) {
581 msg("Dump aborted by the end of tape script\n");
582 dumpabort(0);
583 }
584 if (eot_code == 0)
585 return;
586 if (nexttape || Mflag)
587 return;
588 if (!nogripe) {
589 msg("Change Volumes: Mount volume #%d\n", tapeno+1);
590 broadcast("CHANGE DUMP VOLUMES!\7\7\n");
591 }
592 while (!query("Is the new volume mounted and ready to go?"))
593 if (query("Do you want to abort?")) {
594 dumpabort(0);
595 /*NOTREACHED*/
596 }
597 }
598
599 void
600 rollforward(void)
601 {
602 struct req *p, *q = NULL, *prev;
603 struct slave *tslp;
604 int i, size, savedtapea, got;
605 union u_spcl *ntb, *otb;
606 struct slave_results returned;
607 #ifdef __linux__
608 int blks;
609 long lastfirstrec;
610 #endif
611 tslp = &slaves[SLAVES];
612 ntb = (union u_spcl *)tslp->tblock[1];
613
614 /*
615 * Each of the N slaves should have requests that need to
616 * be replayed on the next tape. Use the extra slave buffers
617 * (slaves[SLAVES]) to construct request lists to be sent to
618 * each slave in turn.
619 */
620 for (i = 0; i < SLAVES; i++) {
621 q = &tslp->req[1];
622 otb = (union u_spcl *)slp->tblock;
623
624 /*
625 * For each request in the current slave, copy it to tslp.
626 */
627
628 prev = NULL;
629 for (p = slp->req; p->count > 0; p += p->count) {
630 *q = *p;
631 if (p->dblk == 0)
632 *ntb++ = *otb++; /* copy the datablock also */
633 prev = q;
634 q += q->count;
635 }
636 if (prev == NULL)
637 quit("rollforward: protocol botch");
638 if (prev->dblk != 0)
639 prev->count -= 1;
640 else
641 ntb--;
642 q -= 1;
643 q->count = 0;
644 q = &tslp->req[0];
645 if (i == 0) {
646 q->dblk = 0;
647 q->count = 1;
648 trecno = 0;
649 nextblock = tslp->tblock;
650 savedtapea = spcl.c_tapea;
651 spcl.c_tapea = slp->tapea;
652 startnewtape(0);
653 spcl.c_tapea = savedtapea;
654 lastspclrec = savedtapea - 1;
655 }
656 size = (char *)ntb - (char *)q;
657 if (dump_atomic_write( slp->fd, (char *)q, size) != size) {
658 perror(" DUMP: error writing command pipe");
659 dumpabort(0);
660 }
661 slp->sent = 1;
662 #ifdef __linux__
663 lastfirstrec = slp->firstrec;
664 #endif
665 if (++slp >= &slaves[SLAVES])
666 slp = &slaves[0];
667
668 q->count = 1;
669
670 if (prev->dblk != 0) {
671 /*
672 * If the last one was a disk block, make the
673 * first of this one be the last bit of that disk
674 * block...
675 */
676 q->dblk = prev->dblk +
677 prev->count * (TP_BSIZE / DEV_BSIZE);
678 ntb = (union u_spcl *)tslp->tblock;
679 } else {
680 /*
681 * It wasn't a disk block. Copy the data to its
682 * new location in the buffer.
683 */
684 q->dblk = 0;
685 *((union u_spcl *)tslp->tblock) = *ntb;
686 ntb = (union u_spcl *)tslp->tblock[1];
687 }
688 }
689 slp->req[0] = *q;
690 nextblock = slp->tblock;
691 if (q->dblk == 0) {
692 #ifdef __linux__
693 /* XXX post increment triggers an egcs-1.1.2-12 bug on alpha/sparc */
694 *(union u_spcl *)(*nextblock) = *(union u_spcl *)tslp->tblock;
695 #endif
696 nextblock++;
697 }
698 trecno = 1;
699
700 /*
701 * Clear the first slaves' response. One hopes that it
702 * worked ok, otherwise the tape is much too short!
703 */
704 if (slp->sent) {
705 if (dump_atomic_read( slp->fd, (char *)&returned, sizeof returned)
706 != sizeof returned) {
707 perror(" DUMP: error reading command pipe in master");
708 dumpabort(0);
709 }
710 got = returned.unclen;
711 bytes_written += returned.clen;
712 if (returned.clen == returned.unclen)
713 uncomprblks++;
714 slp->sent = 0;
715
716 if (got < 0)
717 tperror(-got);
718
719 if (got == 0) {
720 quit("EOT detected at start of the tape!\n");
721 }
722 }
723
724 #ifdef __linux__
725 blks = 0;
726 if (spcl.c_type != TS_END) {
727 for (i = 0; i < spcl.c_count; i++)
728 if (spcl.c_addr[i] != 0)
729 blks++;
730 }
731
732 slp->firstrec = lastfirstrec + ntrec;
733 slp->count = lastspclrec + blks + 1 - spcl.c_tapea;
734 slp->inode = curino;
735 asize += tenths + returned.clen / density;
736 blockswritten += ntrec;
737 blocksthisvol += ntrec;
738 #endif
739 }
740
741 /*
742 * We implement taking and restoring checkpoints on the tape level.
743 * When each tape is opened, a new process is created by forking; this
744 * saves all of the necessary context in the parent. The child
745 * continues the dump; the parent waits around, saving the context.
746 * If the child returns X_REWRITE, then it had problems writing that tape;
747 * this causes the parent to fork again, duplicating the context, and
748 * everything continues as if nothing had happened.
749 */
750 void
751 startnewtape(int top)
752 {
753 int parentpid;
754 int childpid;
755 int status;
756 int waitpid;
757 char *p;
758
759 #ifdef __linux__
760 sigset_t sigs;
761 sigemptyset(&sigs);
762 sigaddset(&sigs, SIGINT);
763 sigprocmask(SIG_BLOCK, &sigs, NULL);
764 #else /* __linux__ */
765 #ifdef sunos
766 void (*interrupt_save)();
767 #else
768 sig_t interrupt_save;
769 #endif
770 interrupt_save = signal(SIGINT, SIG_IGN);
771 #endif /* __linux__ */
772
773 parentpid = getpid();
774 tapea_volume = spcl.c_tapea;
775 tapea_bytes = bytes_written;
776 tstart_volume = time(NULL);
777
778 restore_check_point:
779 #ifdef __linux__
780 sigprocmask(SIG_UNBLOCK, &sigs, NULL);
781 #else
782 (void)signal(SIGINT, interrupt_save);
783 #endif
784 /*
785 * All signals are inherited...
786 */
787 childpid = fork();
788 if (childpid < 0) {
789 msg("Context save fork fails in parent %d\n", parentpid);
790 Exit(X_ABORT);
791 }
792 if (childpid != 0) {
793 /*
794 * PARENT:
795 * save the context by waiting
796 * until the child doing all of the work returns.
797 * don't catch the interrupt
798 */
799 #ifdef __linux__
800 sigprocmask(SIG_BLOCK, &sigs, NULL);
801 #else
802 signal(SIGINT, SIG_IGN);
803 #endif
804 #ifdef TDEBUG
805 msg("Tape: %d; parent process: %d child process %d\n",
806 tapeno+1, parentpid, childpid);
807 #endif /* TDEBUG */
808 while ((waitpid = wait(&status)) != childpid)
809 if (waitpid != rshpid)
810 msg("Parent %d waiting for child %d has another child %d return\n",
811 parentpid, childpid, waitpid);
812 if (status & 0xFF) {
813 msg("Child %d returns LOB status %o\n",
814 childpid, status&0xFF);
815 }
816 status = (status >> 8) & 0xFF;
817 #ifdef TDEBUG
818 switch(status) {
819 case X_FINOK:
820 msg("Child %d finishes X_FINOK\n", childpid);
821 break;
822 case X_ABORT:
823 msg("Child %d finishes X_ABORT\n", childpid);
824 break;
825 case X_REWRITE:
826 msg("Child %d finishes X_REWRITE\n", childpid);
827 break;
828 default:
829 msg("Child %d finishes unknown %d\n",
830 childpid, status);
831 break;
832 }
833 #endif /* TDEBUG */
834 switch(status) {
835 case X_FINOK:
836 Exit(X_FINOK);
837 case X_ABORT:
838 Exit(X_ABORT);
839 case X_REWRITE:
840 goto restore_check_point;
841 default:
842 msg("Bad return code from dump: %d\n", status);
843 Exit(X_ABORT);
844 }
845 /*NOTREACHED*/
846 } else { /* we are the child; just continue */
847 #ifdef TDEBUG
848 sleep(4); /* allow time for parent's message to get out */
849 msg("Child on Tape %d has parent %d, my pid = %d\n",
850 tapeno+1, parentpid, getpid());
851 #endif /* TDEBUG */
852 /*
853 * If we have a name like "/dev/rmt0,/dev/rmt1",
854 * use the name before the comma first, and save
855 * the remaining names for subsequent volumes.
856 */
857 tapeno++; /* current tape sequence */
858 if (Mflag) {
859 snprintf(tape, MAXPATHLEN, "%s%03d", tapeprefix, tapeno);
860 tape[MAXPATHLEN - 1] = '\0';
861 msg("Dumping volume %d on %s\n", tapeno, tape);
862 }
863 else if (nexttape || strchr(tapeprefix, ',')) {
864 if (nexttape && *nexttape)
865 tapeprefix = nexttape;
866 if ((p = strchr(tapeprefix, ',')) != NULL) {
867 *p = '\0';
868 nexttape = p + 1;
869 } else
870 nexttape = NULL;
871 strncpy(tape, tapeprefix, MAXPATHLEN);
872 tape[MAXPATHLEN - 1] = '\0';
873 msg("Dumping volume %d on %s\n", tapeno, tape);
874 }
875 if (blocksperfiles && blocksperfiles_current < *blocksperfiles)
876 blocksperfiles_current++;
877 #ifdef RDUMP
878 while ((tapefd = (host ? rmtopen(tape, O_WRONLY|O_CREAT|O_TRUNC) : pipeout ?
879 fileno(stdout) :
880 OPEN(tape, O_WRONLY|O_CREAT|O_TRUNC, 0666))) < 0)
881 #else
882 while ((tapefd = (pipeout ? fileno(stdout) :
883 OPEN(tape, O_WRONLY|O_CREAT|O_TRUNC, 0666))) < 0)
884 #endif
885 {
886 msg("Cannot open output \"%s\": %s\n", tape,
887 strerror(errno));
888 if (!query("Do you want to retry the open?"))
889 dumpabort(0);
890 }
891 #ifdef RDUMP
892 if (!host)
893 #endif
894 {
895 struct mtget mt_stat;
896 magtapeout = ioctl(tapefd, MTIOCGET, (char *)&mt_stat) == 0;
897 /*
898 msg("Output is to %s\n",
899 magtapeout ? "tape" : "file/pipe");
900 */
901 }
902
903 enslave(); /* Share open tape file descriptor with slaves */
904
905 asize = 0;
906 blocksthisvol = 0;
907 if (top)
908 newtape++; /* new tape signal */
909 spcl.c_count = slp->count;
910 /*
911 * measure firstrec in TP_BSIZE units since restore doesn't
912 * know the correct ntrec value...
913 */
914 spcl.c_firstrec = slp->firstrec;
915 spcl.c_volume++;
916 spcl.c_type = TS_TAPE;
917 spcl.c_flags |= DR_NEWHEADER;
918 spcl.c_ntrec = ntrec;
919 if (compressed)
920 spcl.c_flags |= DR_COMPRESSED;
921 writeheader((dump_ino_t)slp->inode);
922 spcl.c_flags &=~ DR_NEWHEADER;
923 msg("Volume %d started with block %ld at: %s", tapeno,
924 spcl.c_tapea, ctime(&tstart_volume));
925 if (tapeno > 1)
926 msg("Volume %d begins with blocks from inode %d\n",
927 tapeno, slp->inode);
928 if (tapeno < (int)TP_NINOS)
929 volinfo[tapeno] = slp->inode;
930 }
931 }
932
933 void
934 dumpabort(UNUSED(int signo))
935 {
936
937 if (master != 0 && master != getpid())
938 /* Signals master to call dumpabort */
939 (void) kill(master, SIGTERM);
940 else {
941 killall();
942 msg("The ENTIRE dump is aborted.\n");
943 }
944 #ifdef RDUMP
945 rmtclose();
946 #endif
947 Exit(X_ABORT);
948 }
949
950 void
951 Exit(int status)
952 {
953
954 #ifdef TDEBUG
955 msg("pid = %d exits with status %d\n", getpid(), status);
956 #endif /* TDEBUG */
957 exit(status);
958 }
959
960 /*
961 * proceed - handler for SIGUSR2, used to synchronize IO between the slaves.
962 */
963 static void
964 proceed(UNUSED(int signo))
965 {
966 if (ready)
967 siglongjmp(jmpbuf, 1);
968 caught++;
969 }
970
971 void
972 enslave(void)
973 {
974 int cmd[2];
975 #ifdef LINUX_FORK_BUG
976 int i, j;
977 #else
978 int i, j;
979 #endif
980
981 master = getpid();
982
983 { struct sigaction sa;
984 memset(&sa, 0, sizeof sa);
985 sigemptyset(&sa.sa_mask);
986 sa.sa_handler = dumpabort;
987 sigaction(SIGTERM, &sa, NULL); /* Slave sends SIGTERM on dumpabort() */
988 sa.sa_handler = sigpipe;
989 sigaction(SIGPIPE, &sa, NULL);
990 sa.sa_handler = proceed;
991 sa.sa_flags = SA_RESTART;
992 sigaction(SIGUSR2, &sa, NULL); /* Slave sends SIGUSR2 to next slave */
993 }
994
995 for (i = 0; i < SLAVES; i++) {
996 if (i == slp - &slaves[0]) {
997 caught = 1;
998 } else {
999 caught = 0;
1000 }
1001
1002 if (socketpair(AF_UNIX, SOCK_STREAM, 0, cmd) < 0 ||
1003 (slaves[i].pid = fork()) < 0)
1004 quit("too many slaves, %d (recompile smaller): %s\n",
1005 i, strerror(errno));
1006
1007 slaves[i].fd = cmd[1];
1008 slaves[i].sent = 0;
1009 if (slaves[i].pid == 0) { /* Slave starts up here */
1010 sigset_t sigs;
1011 for (j = 0; j <= i; j++)
1012 (void) close(slaves[j].fd);
1013 sigemptyset(&sigs);
1014 sigaddset(&sigs, SIGINT); /* Master handles this */
1015 #if defined(SIGINFO)
1016 sigaddset(&sigs, SIGINFO);
1017 #endif
1018 sigprocmask(SIG_BLOCK, &sigs, NULL);
1019
1020 #ifdef LINUX_FORK_BUG
1021 if (dump_atomic_write( cmd[0], (char *) &i, sizeof i)
1022 != sizeof i)
1023 quit("master/slave protocol botched 3\n");
1024 #endif
1025 doslave(cmd[0],
1026 #ifdef WRITEDEBUG
1027 i,
1028 #endif
1029 (slaves[i].pid == slp->pid));
1030 Exit(X_FINOK);
1031 }
1032 else
1033 close(cmd[0]);
1034 }
1035
1036 #ifdef LINUX_FORK_BUG
1037 /*
1038 * Wait for all slaves to _actually_ start to circumvent a bug in
1039 * Linux kernels >= 2.1.3 where a signal sent to a child that hasn't
1040 * returned from fork() causes a SEGV in the child process
1041 */
1042 for (i = 0; i < SLAVES; i++)
1043 if (dump_atomic_read( slaves[i].fd, (char *) &j, sizeof j) != sizeof j)
1044 quit("master/slave protocol botched 4\n");
1045 #endif
1046
1047 for (i = 0; i < SLAVES; i++)
1048 (void) dump_atomic_write( slaves[i].fd,
1049 (char *) &slaves[(i + 1) % SLAVES].pid,
1050 sizeof slaves[0].pid);
1051
1052 master = 0;
1053 }
1054
1055 void
1056 killall(void)
1057 {
1058 int i;
1059
1060 for (i = 0; i < SLAVES; i++)
1061 if (slaves[i].pid > 0) {
1062 (void) kill(slaves[i].pid, SIGKILL);
1063 slaves[i].sent = 0;
1064 }
1065 }
1066
1067 /*
1068 * Synchronization - each process waits for a SIGUSR2 from the
1069 * previous process before writing to the tape, and sends SIGUSR2
1070 * to the next process when the tape write completes. On tape errors
1071 * a SIGUSR1 is sent to the master which then terminates all of the
1072 * slaves.
1073 */
1074 static void
1075 doslave(int cmd,
1076 #ifdef WRITEDEBUG
1077 int slave_number,
1078 #endif
1079 int first)
1080 {
1081 int nread;
1082 int nextslave;
1083 volatile int wrote = 0, size, eot_count, bufsize;
1084 char * volatile buffer;
1085 #if defined(HAVE_ZLIB) || defined(HAVE_BZLIB) || defined(HAVE_LZO)
1086 struct tapebuf * volatile comp_buf = NULL;
1087 int compresult;
1088 volatile int do_compress = !first;
1089 unsigned long worklen;
1090 #ifdef HAVE_LZO
1091 lzo_align_t __LZO_MMODEL *LZO_WorkMem;
1092 #endif
1093 #endif /* HAVE_ZLIB || HAVE_BZLIB || HAVE_LZO */
1094 struct slave_results returns;
1095 #ifdef __linux__
1096 errcode_t retval;
1097 #endif
1098 #ifdef USE_QFA
1099 long long curtapepos;
1100 union u_spcl *uspclptr;
1101 struct s_spcl *spclptr;
1102 /* long maxntrecs = 300000000 / (ntrec * 1024); last tested: 50 000 000 */
1103 long maxntrecs = 50000; /* every 50MB */
1104 long cntntrecs = maxntrecs;
1105 #endif /* USE_QFA */
1106 sigset_t set;
1107
1108 sigemptyset(&set);
1109 sigaddset(&set, SIGUSR2);
1110 sigprocmask(SIG_BLOCK, &set, NULL);
1111 sigemptyset(&set);
1112
1113 /*
1114 * Need our own seek pointer.
1115 */
1116 (void) close(diskfd);
1117 if ((diskfd = OPEN(disk, O_RDONLY)) < 0)
1118 quit("slave couldn't reopen disk: %s\n", strerror(errno));
1119 #ifdef __linux__
1120 #ifdef BLKFLSBUF
1121 (void)ioctl(diskfd, BLKFLSBUF, 0);
1122 #endif
1123 ext2fs_close(fs);
1124 retval = dump_fs_open(disk, &fs);
1125 if (retval)
1126 quit("slave couldn't reopen disk: %s\n", error_message(retval));
1127 #endif /* __linux__ */
1128
1129 /*
1130 * Need the pid of the next slave in the loop...
1131 */
1132 if ((nread = dump_atomic_read( cmd, (char *)&nextslave, sizeof nextslave))
1133 != sizeof nextslave) {
1134 quit("master/slave protocol botched - didn't get pid of next slave.\n");
1135 }
1136
1137 #if defined(HAVE_ZLIB) || defined(HAVE_BZLIB) || defined(HAVE_LZO)
1138 /* if we're doing a compressed dump, allocate the compress buffer */
1139 if (compressed) {
1140 int bsiz = sizeof(struct tapebuf) + writesize;
1141 /* Add extra space to deal with compression enlarging the buffer */
1142 if (TP_BSIZE > writesize/16 + 67)
1143 bsiz += TP_BSIZE;
1144 else
1145 bsiz += writesize/16 + 67;
1146 comp_buf = malloc(bsiz);
1147 if (comp_buf == NULL)
1148 quit("couldn't allocate a compress buffer.\n");
1149 if (zipflag == COMPRESS_ZLIB)
1150 comp_buf->flags = COMPRESS_ZLIB;
1151 else if (zipflag == COMPRESS_BZLIB)
1152 comp_buf->flags = COMPRESS_BZLIB;
1153 else if (zipflag == COMPRESS_LZO) {
1154 comp_buf->flags = COMPRESS_LZO;
1155 if (lzo_init() != LZO_E_OK) quit("lzo_init failed\n");
1156 } else
1157 quit("internal error - unknown compression method: %d\n", zipflag);
1158 }
1159 #ifdef HAVE_LZO
1160 LZO_WorkMem = malloc(LZO1X_1_MEM_COMPRESS);
1161 if (!LZO_WorkMem)
1162 quit("couldn't allocate a compress buffer.\n");
1163 #endif
1164 #endif /* HAVE_ZLIB || HAVE_BZLIB || HAVE_LZO */
1165
1166 /*
1167 * Get list of blocks to dump, read the blocks into tape buffer
1168 */
1169 while ((nread = dump_atomic_read( cmd, (char *)slp->req, reqsiz)) == reqsiz) {
1170 struct req *p = slp->req;
1171
1172 for (trecno = 0; trecno < ntrec;
1173 trecno += p->count, p += p->count) {
1174 if (p->dblk) { /* read a disk block */
1175 bread(p->dblk, slp->tblock[trecno],
1176 p->count * TP_BSIZE);
1177 } else { /* read record from pipe */
1178 if (p->count != 1 || dump_atomic_read( cmd,
1179 (char *)slp->tblock[trecno],
1180 TP_BSIZE) != TP_BSIZE)
1181 quit("master/slave protocol botched.\n");
1182 }
1183 }
1184
1185 /* Try to write the data... */
1186 wrote = 0;
1187 eot_count = 0;
1188 size = 0;
1189 buffer = (char *) slp->tblock[0]; /* set write pointer */
1190 bufsize = writesize; /* length to write */
1191 returns.clen = returns.unclen = bufsize;
1192
1193 #if defined(HAVE_ZLIB) || defined(HAVE_BZLIB) || defined(HAVE_LZO)
1194 /*
1195 * When writing a compressed dump, each block except
1196 * the first one on each tape is written
1197 * from struct tapebuf with an 4 byte prefix
1198 * followed by the data. This can be less than
1199 * writesize. Restore, on a short read, can compare the
1200 * length read to the compressed length in the header
1201 * to verify that the read was good. Blocks which don't
1202 * compress well are written uncompressed.
1203 * The first block written by each slave is not compressed
1204 * and does not have a prefix.
1205 */
1206
1207 if (compressed && do_compress) {
1208 comp_buf->length = bufsize;
1209 worklen = TP_BSIZE + writesize;
1210 compresult = 1;
1211 #ifdef HAVE_ZLIB
1212 if (zipflag == COMPRESS_ZLIB) {
1213 compresult = compress2(comp_buf->buf,
1214 &worklen,
1215 (char *)slp->tblock[0],
1216 writesize,
1217 compressed);
1218 if (compresult == Z_OK)
1219 compresult = 1;
1220 else
1221 compresult = 0;
1222 }
1223 #endif /* HAVE_ZLIB */
1224 #ifdef HAVE_BZLIB
1225 if (zipflag == COMPRESS_BZLIB) {
1226 unsigned int worklen2 = worklen;
1227 compresult = BZ2_bzBuffToBuffCompress(
1228 comp_buf->buf,
1229 &worklen2,
1230 (char *)slp->tblock[0],
1231 writesize,
1232 compressed,
1233 0, 30);
1234 worklen = worklen2;
1235 if (compresult == BZ_OK)
1236 compresult = 1;
1237 else
1238 compresult = 0;
1239 }
1240
1241 #endif /* HAVE_BZLIB */
1242 #ifdef HAVE_LZO
1243 if (zipflag == COMPRESS_LZO) {
1244 lzo_uint worklen2 = worklen;
1245 compresult = lzo1x_1_compress((char *)slp->tblock[0],writesize,
1246 comp_buf->buf,
1247 &worklen2,
1248 LZO_WorkMem);
1249 worklen = worklen2;
1250 if (compresult == LZO_E_OK)
1251 compresult = 1;
1252 else
1253 compresult = 0;
1254 }
1255 #endif /* HAVE_LZO */
1256 if (compresult && worklen <= ((unsigned long)writesize - 16)) {
1257 /* write the compressed buffer */
1258 comp_buf->length = worklen;
1259 comp_buf->compressed = 1;
1260 buffer = (char *) comp_buf;
1261 returns.clen = bufsize = worklen + sizeof(struct tapebuf);
1262 }
1263 else {
1264 /* write the data uncompressed */
1265 comp_buf->length = writesize;
1266 comp_buf->compressed = 0;
1267 buffer = (char *) comp_buf;
1268 returns.clen = bufsize = writesize + sizeof(struct tapebuf);
1269 returns.unclen = returns.clen;
1270 memcpy(comp_buf->buf, (char *)slp->tblock[0], writesize);
1271 }
1272 }
1273 /* compress the remaining blocks if we're compressing */
1274 do_compress = compressed;
1275 #endif /* HAVE_ZLIB || HAVE_BZLIB || HAVE_LZO */
1276
1277 if (sigsetjmp(jmpbuf, 1) == 0) {
1278 ready = 1;
1279 if (!caught)
1280 sigsuspend(&set);
1281 }
1282 ready = 0;
1283 caught = 0;
1284
1285 #ifdef USE_QFA
1286 if (gTapeposfd >= 0) {
1287 int i;
1288 int foundone = 0;
1289
1290 for (i = 0; (i < ntrec) && !foundone; ++i) {
1291 uspclptr = (union u_spcl *)&slp->tblock[i];
1292 spclptr = &uspclptr->s_spcl;
1293 if ((spclptr->c_magic == NFS_MAGIC) &&
1294 (spclptr->c_type == TS_INODE) &&
1295 (spclptr->c_date == gThisDumpDate) &&
1296 !(spclptr->c_dinode.di_mode & S_IFDIR)
1297 ) {
1298 foundone = 1;
1299 /* if (cntntrecs >= maxntrecs) { only write every maxntrecs amount of data */
1300 cntntrecs = 0;
1301 if (gtperr == 0)
1302 gtperr = GetTapePos(&curtapepos);
1303 /* if an error occured previously don't
1304 * try again */
1305 if (gtperr == 0) {
1306 #ifdef DEBUG_QFA
1307 msg("inode %ld at tapepos %ld\n", spclptr->c_inumber, curtapepos);
1308 #endif
1309 gtperr = MkTapeString(spclptr, curtapepos);
1310 }
1311 /* } */
1312 }
1313 }
1314 }
1315 #endif /* USE_QFA */
1316
1317 while (eot_count < 10 && size < bufsize) {
1318 #ifdef RDUMP
1319 if (host)
1320 wrote = rmtwrite(buffer + size, bufsize - size);
1321 else
1322 #endif
1323 wrote = write(tapefd, buffer + size, bufsize - size);
1324 #ifdef WRITEDEBUG
1325 printf("slave %d wrote %d\n", slave_number, wrote);
1326 #endif
1327 if (wrote < 0 && errno != ENOSPC)
1328 break;
1329 if (wrote == 0 || (wrote < 0 && errno == ENOSPC))
1330 eot_count++;
1331 else
1332 size += wrote;
1333 }
1334
1335 #ifdef WRITEDEBUG
1336 if (size != bufsize)
1337 printf("slave %d only wrote %d out of %d bytes and gave up.\n",
1338 slave_number, size, bufsize);
1339 #endif
1340
1341 /*
1342 * Handle ENOSPC as an EOT condition.
1343 */
1344 if (wrote < 0 && errno == ENOSPC) {
1345 wrote = 0;
1346 eot_count++;
1347 }
1348
1349 if (eot_count > 0)
1350 returns.clen = returns.unclen = 0;
1351
1352 /*
1353 * pass errno back to master for special handling
1354 */
1355 if (wrote < 0)
1356 returns.unclen = -errno;
1357
1358 /*
1359 * pass size of data and size of write back to master
1360 * (for EOT handling)
1361 */
1362 (void) dump_atomic_write( cmd, (char *)&returns, sizeof returns);
1363
1364 /*
1365 * Signal the next slave to go.
1366 */
1367 (void) kill(nextslave, SIGUSR2);
1368 #ifdef USE_QFA
1369 if (gTapeposfd >= 0) {
1370 cntntrecs += ntrec;
1371 }
1372 #endif /* USE_QFA */
1373 }
1374 if (nread != 0)
1375 quit("error reading command pipe: %s\n", strerror(errno));
1376 }
1377
1378 /*
1379 * Since a read from a pipe may not return all we asked for,
1380 * or a write may not write all we ask if we get a signal,
1381 * loop until the count is satisfied (or error).
1382 */
1383 static ssize_t
1384 dump_atomic_read(int fd, void *buf, size_t count)
1385 {
1386 int got, need = count;
1387
1388 do {
1389 while ((got = read(fd, buf, need)) > 0 && (need -= got) > 0)
1390 (char *)buf += got;
1391 } while (got == -1 && errno == EINTR);
1392 return (got < 0 ? got : (ssize_t)count - need);
1393 }
1394
1395 /*
1396 * Since a read from a pipe may not return all we asked for,
1397 * or a write may not write all we ask if we get a signal,
1398 * loop until the count is satisfied (or error).
1399 */
1400 static ssize_t
1401 dump_atomic_write(int fd, const void *buf, size_t count)
1402 {
1403 int got, need = count;
1404
1405 do {
1406 while ((got = write(fd, buf, need)) > 0 && (need -= got) > 0)
1407 (char *)buf += got;
1408 } while (got == -1 && errno == EINTR);
1409 return (got < 0 ? got : (ssize_t)count - need);
1410 }
1411
1412
1413 /*
1414 int
1415 SetLogicalPos(void)
1416 {
1417 int err = 0;
1418 struct mt_pos buf;
1419
1420 buf.mt_op = MTSETDRVBUFFER;
1421 buf.mt_count = MT_ST_BOOLEANS | MT_ST_SCSI2LOGICAL;
1422 if (ioctl(tapefd, MTIOCTOP, &buf) == -1) {
1423 err = errno;
1424 msg("[%ld] error: %d (setting logical)\n",
1425 (unsigned long)getpid(), err);
1426 }
1427 return err;
1428 }
1429 */
1430
1431 #ifdef USE_QFA
1432 #define LSEEK_GET_TAPEPOS 10
1433 #define LSEEK_GO2_TAPEPOS 11
1434 /*
1435 * read the current tape position
1436 */
1437 static int
1438 GetTapePos(long long *pos)
1439 {
1440 int err = 0;
1441
1442 #ifdef RDUMP
1443 if (host) {
1444 *pos = (long long) rmtseek((OFF_T)0, (int)LSEEK_GET_TAPEPOS);
1445 err = *pos < 0;
1446 }
1447 else
1448 #endif
1449 {
1450 if (magtapeout) {
1451 long mtpos;
1452 *pos = 0;
1453 err = (ioctl(tapefd, MTIOCPOS, &mtpos) < 0);
1454 *pos = (long long)mtpos;
1455 }
1456 else {
1457 *pos = LSEEK(tapefd, 0, SEEK_CUR);
1458 err = (*pos < 0);
1459 }
1460 }
1461 if (err) {
1462 err = errno;
1463 msg("[%ld] error: %d (getting tapepos: %lld)\n", getpid(),
1464 err, *pos);
1465 return err;
1466 }
1467 return err;
1468 }
1469
1470 static int
1471 MkTapeString(struct s_spcl *spclptr, long long curtapepos)
1472 {
1473 int err = 0;
1474
1475 #ifdef DEBUG_QFA
1476 msg("inode %ld at tapepos %lld\n", spclptr->c_inumber, curtapepos);
1477 #endif
1478
1479 snprintf(gTps, sizeof(gTps), "%ld\t%d\t%lld\n",
1480 (unsigned long)spclptr->c_inumber,
1481 tapeno,
1482 curtapepos);
1483 gTps[sizeof(gTps) - 1] = '\0';
1484 if (write(gTapeposfd, gTps, strlen(gTps)) != (ssize_t)strlen(gTps)) {
1485 err = errno;
1486 warn("error writing tapepos file. (error %d)\n", errno);
1487 }
1488 return err;
1489 }
1490 #endif /* USE_QFA */
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