3 * block.c -- tape block handling functions
5 * Kern Sibbald, March MMI
6 * added BB02 format October MMII
12 Copyright (C) 2000-2004 Kern Sibbald and John Walker
14 This program is free software; you can redistribute it and/or
15 modify it under the terms of the GNU General Public License as
16 published by the Free Software Foundation; either version 2 of
17 the License, or (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 General Public License for more details.
24 You should have received a copy of the GNU General Public
25 License along with this program; if not, write to the Free
26 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
35 extern int debug_level;
38 * Dump the block header, then walk through
39 * the block printing out the record headers.
41 void dump_block(DEV_BLOCK *b, char *msg)
45 char Id[BLKHDR_ID_LENGTH+1];
46 uint32_t CheckSum, BlockCheckSum;
49 uint32_t VolSessionId, VolSessionTime, data_len;
54 unser_begin(b->buf, BLKHDR1_LENGTH);
55 unser_uint32(CheckSum);
56 unser_uint32(block_len);
57 unser_uint32(BlockNumber);
58 unser_bytes(Id, BLKHDR_ID_LENGTH);
59 ASSERT(unser_length(b->buf) == BLKHDR1_LENGTH);
60 Id[BLKHDR_ID_LENGTH] = 0;
62 unser_uint32(VolSessionId);
63 unser_uint32(VolSessionTime);
67 VolSessionId = VolSessionTime = 0;
72 if (block_len > 100000) {
73 Dmsg3(20, "Dump block %s 0x%x blocksize too big %u\n", msg, b, block_len);
77 BlockCheckSum = bcrc32((uint8_t *)b->buf+BLKHDR_CS_LENGTH,
78 block_len-BLKHDR_CS_LENGTH);
79 Pmsg6(000, "Dump block %s %x: size=%d BlkNum=%d\n\
80 Hdrcksum=%x cksum=%x\n",
81 msg, b, block_len, BlockNumber, CheckSum, BlockCheckSum);
83 while (p < (b->buf + block_len+WRITE_RECHDR_LENGTH)) {
84 unser_begin(p, WRITE_RECHDR_LENGTH);
85 if (rhl == RECHDR1_LENGTH) {
86 unser_uint32(VolSessionId);
87 unser_uint32(VolSessionTime);
89 unser_int32(FileIndex);
91 unser_uint32(data_len);
92 Pmsg6(000, " Rec: VId=%u VT=%u FI=%s Strm=%s len=%d p=%x\n",
93 VolSessionId, VolSessionTime, FI_to_ascii(FileIndex),
94 stream_to_ascii(Stream, FileIndex), data_len, p);
100 * Create a new block structure.
101 * We pass device so that the block can inherit the
102 * min and max block sizes.
104 DEV_BLOCK *new_block(DEVICE *dev)
106 DEV_BLOCK *block = (DEV_BLOCK *)get_memory(sizeof(DEV_BLOCK));
108 memset(block, 0, sizeof(DEV_BLOCK));
110 /* If the user has specified a max_block_size, use it as the default */
111 if (dev->max_block_size == 0) {
112 block->buf_len = DEFAULT_BLOCK_SIZE;
114 block->buf_len = dev->max_block_size;
117 block->block_len = block->buf_len; /* default block size */
118 block->buf = get_memory(block->buf_len);
120 block->BlockVer = BLOCK_VER; /* default write version */
121 Dmsg1(90, "Returning new block=%x\n", block);
126 * Only the first block checksum error was reported.
127 * If there are more, report it now.
129 void print_block_read_errors(JCR *jcr, DEV_BLOCK *block)
131 if (block->read_errors > 1) {
132 Jmsg(jcr, M_ERROR, 0, _("%d block read errors not printed.\n"),
140 void free_block(DEV_BLOCK *block)
142 Dmsg1(199, "free_block buffer %x\n", block->buf);
143 free_memory(block->buf);
144 Dmsg1(199, "free_block block %x\n", block);
145 free_memory((POOLMEM *)block);
148 /* Empty the block -- for writing */
149 void empty_block(DEV_BLOCK *block)
151 block->binbuf = WRITE_BLKHDR_LENGTH;
152 block->bufp = block->buf + block->binbuf;
154 block->write_failed = false;
155 block->block_read = false;
156 block->FirstIndex = block->LastIndex = 0;
160 * Create block header just before write. The space
161 * in the buffer should have already been reserved by
164 static void ser_block_header(DEV_BLOCK *block)
167 uint32_t CheckSum = 0;
168 uint32_t block_len = block->binbuf;
170 Dmsg1(190, "ser_block_header: block_len=%d\n", block_len);
171 ser_begin(block->buf, BLKHDR2_LENGTH);
172 ser_uint32(CheckSum);
173 ser_uint32(block_len);
174 ser_uint32(block->BlockNumber);
175 ser_bytes(WRITE_BLKHDR_ID, BLKHDR_ID_LENGTH);
176 if (BLOCK_VER >= 2) {
177 ser_uint32(block->VolSessionId);
178 ser_uint32(block->VolSessionTime);
181 /* Checksum whole block except for the checksum */
182 CheckSum = bcrc32((uint8_t *)block->buf+BLKHDR_CS_LENGTH,
183 block_len-BLKHDR_CS_LENGTH);
184 Dmsg1(190, "ser_bloc_header: checksum=%x\n", CheckSum);
185 ser_begin(block->buf, BLKHDR2_LENGTH);
186 ser_uint32(CheckSum); /* now add checksum to block header */
190 * Unserialize the block header for reading block.
191 * This includes setting all the buffer pointers correctly.
193 * Returns: 0 on failure (not a block)
196 static int unser_block_header(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
199 char Id[BLKHDR_ID_LENGTH+1];
200 uint32_t CheckSum, BlockCheckSum;
203 uint32_t BlockNumber;
206 unser_begin(block->buf, BLKHDR_LENGTH);
207 unser_uint32(CheckSum);
208 unser_uint32(block_len);
209 unser_uint32(BlockNumber);
210 unser_bytes(Id, BLKHDR_ID_LENGTH);
211 ASSERT(unser_length(block->buf) == BLKHDR1_LENGTH);
213 Id[BLKHDR_ID_LENGTH] = 0;
215 bhl = BLKHDR1_LENGTH;
217 block->bufp = block->buf + bhl;
218 if (strncmp(Id, BLKHDR1_ID, BLKHDR_ID_LENGTH) != 0) {
219 Mmsg2(&dev->errmsg, _("Volume data error! Wanted ID: %s, got %s. Buffer discarded.\n"),
221 if (block->read_errors == 0 || verbose >= 2) {
222 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
224 block->read_errors++;
227 } else if (Id[3] == '2') {
228 unser_uint32(block->VolSessionId);
229 unser_uint32(block->VolSessionTime);
230 bhl = BLKHDR2_LENGTH;
232 block->bufp = block->buf + bhl;
233 if (strncmp(Id, BLKHDR2_ID, BLKHDR_ID_LENGTH) != 0) {
234 Mmsg2(&dev->errmsg, _("Volume data error! Wanted ID: %s, got %s. Buffer discarded.\n"),
236 if (block->read_errors == 0 || verbose >= 2) {
237 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
239 block->read_errors++;
243 Mmsg1(&dev->errmsg, _("Volume data error! Wanted block-id BB02, got %s. Buffer discarded.\n"), Id);
244 if (block->read_errors == 0 || verbose >= 2) {
245 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
247 block->read_errors++;
252 if (block_len > MAX_BLOCK_LENGTH) {
253 Mmsg1(&dev->errmsg, _("Volume data error! Block length %u is insane (too large), probably due to a bad archive.\n"),
255 if (block->read_errors == 0 || verbose >= 2) {
256 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
258 block->read_errors++;
262 Dmsg1(190, "unser_block_header block_len=%d\n", block_len);
263 /* Find end of block or end of buffer whichever is smaller */
264 if (block_len > block->read_len) {
265 block_end = block->read_len;
267 block_end = block_len;
269 block->binbuf = block_end - bhl;
270 block->block_len = block_len;
271 block->BlockNumber = BlockNumber;
272 Dmsg3(190, "Read binbuf = %d %d block_len=%d\n", block->binbuf,
274 if (block_len <= block->read_len) {
275 BlockCheckSum = bcrc32((uint8_t *)block->buf+BLKHDR_CS_LENGTH,
276 block_len-BLKHDR_CS_LENGTH);
277 if (BlockCheckSum != CheckSum) {
278 Mmsg3(&dev->errmsg, _("Volume data error! Block checksum mismatch in block %u: calc=%x blk=%x\n"),
279 (unsigned)BlockNumber, BlockCheckSum, CheckSum);
280 if (block->read_errors == 0 || verbose >= 2) {
281 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
283 block->read_errors++;
291 * Write a block to the device, with locking and unlocking
293 * Returns: 1 on success
297 int write_block_to_device(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
303 * If a new volume has been mounted since our last write
304 * Create a JobMedia record for the previous volume written,
305 * and set new parameters to write this volume
306 * The same applies for if we are in a new file.
308 if (jcr->NewVol || jcr->NewFile) {
309 /* Create a jobmedia record for this job */
310 if (!dir_create_jobmedia_record(jcr)) {
311 Jmsg(jcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
312 jcr->VolCatInfo.VolCatName, jcr->Job);
313 set_new_volume_parameters(jcr, dev);
318 /* Note, setting a new volume also handles any pending new file */
319 set_new_volume_parameters(jcr, dev);
320 jcr->NewFile = false; /* this handled for new file too */
322 set_new_file_parameters(jcr, dev);
326 if (!write_block_to_dev(jcr, dev, block)) {
327 stat = fixup_device_block_write_error(jcr, dev, block);
335 * Write a block to the device
337 * Returns: 1 on success or EOT
340 int write_block_to_dev(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
343 uint32_t wlen; /* length to write */
344 int hit_max1, hit_max2;
347 #ifdef NO_TAPE_WRITE_TEST
351 ASSERT(block->binbuf == ((uint32_t) (block->bufp - block->buf)));
353 /* dump_block(block, "before write"); */
354 if (dev->state & ST_WEOT) {
355 Dmsg0(100, "return write_block_to_dev with ST_WEOT\n");
356 Jmsg(jcr, M_FATAL, 0, _("Cannot write block. Device at EOM.\n"));
359 wlen = block->binbuf;
360 if (wlen <= WRITE_BLKHDR_LENGTH) { /* Does block have data in it? */
361 Dmsg0(100, "return write_block_to_dev no data to write\n");
365 * Clear to the end of the buffer if it is not full,
366 * and on tape devices, apply min and fixed blocking.
368 if (wlen != block->buf_len) {
369 uint32_t blen; /* current buffer length */
371 Dmsg2(200, "binbuf=%d buf_len=%d\n", block->binbuf, block->buf_len);
374 /* Adjust write size to min/max for tapes only */
375 if (dev->state & ST_TAPE) {
376 if (wlen < dev->min_block_size) {
377 wlen = ((dev->min_block_size + TAPE_BSIZE - 1) / TAPE_BSIZE) * TAPE_BSIZE;
379 /* check for fixed block size */
380 if (dev->min_block_size == dev->max_block_size) {
381 wlen = block->buf_len; /* fixed block size already rounded */
385 memset(block->bufp, 0, wlen-blen); /* clear garbage */
389 ser_block_header(block);
391 /* Limit maximum Volume size to value specified by user */
392 hit_max1 = (dev->max_volume_size > 0) &&
393 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->max_volume_size;
394 hit_max2 = (dev->VolCatInfo.VolCatMaxBytes > 0) &&
395 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->VolCatInfo.VolCatMaxBytes;
396 if (hit_max1 || hit_max2) {
399 Dmsg0(10, "==== Output bytes Triggered medium max capacity.\n");
401 max_cap = dev->max_volume_size;
403 max_cap = dev->VolCatInfo.VolCatMaxBytes;
405 Jmsg(jcr, M_INFO, 0, _("User defined maximum volume capacity %s exceeded on device %s.\n"),
406 edit_uint64(max_cap, ed1), dev->dev_name);
407 block->write_failed = true;
408 if (weof_dev(dev, 1) != 0) { /* end tape */
409 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
410 dev->VolCatInfo.VolCatErrors++;
412 /* Don't do update after second EOF or file count will be wrong */
413 Dmsg0(100, "dir_update_volume_info\n");
414 dev->VolCatInfo.VolCatFiles = dev->file;
415 dir_update_volume_info(jcr, dev, 0);
416 if (dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* write eof */
417 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
418 dev->VolCatInfo.VolCatErrors++;
420 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
424 /* Limit maximum File size on volume to user specified value */
425 if (dev_state(dev, ST_TAPE)) {
426 if ((dev->max_file_size > 0) &&
427 (dev->file_addr+block->binbuf) >= dev->max_file_size) {
430 if (weof_dev(dev, 1) != 0) { /* write eof */
431 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
432 block->write_failed = true;
433 dev->VolCatInfo.VolCatErrors++;
434 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
435 Dmsg0(100, "dir_update_volume_info\n");
436 dev->VolCatInfo.VolCatFiles = dev->file;
437 dir_update_volume_info(jcr, dev, 0);
441 /* Do bookkeeping to handle EOF just written */
442 Dmsg0(100, "dir_update_volume_info\n");
443 dev->VolCatInfo.VolCatFiles = dev->file;
444 dir_update_volume_info(jcr, dev, 0);
445 if (!dir_create_jobmedia_record(jcr)) {
446 Jmsg(jcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
447 jcr->VolCatInfo.VolCatName, jcr->Job);
451 * Walk through all attached jcrs indicating the file has changed
453 Dmsg1(100, "Walk attached jcrs. Volume=%s\n", dev->VolCatInfo.VolCatName);
454 for (JCR *mjcr=NULL; (mjcr=next_attached_jcr(dev, mjcr)); ) {
455 if (mjcr->JobId == 0) {
456 continue; /* ignore console */
458 mjcr->NewFile = true; /* set reminder to do set_new_file_params */
460 set_new_file_parameters(jcr, dev);
464 dev->VolCatInfo.VolCatWrites++;
465 Dmsg1(300, "Write block of %u bytes\n", wlen);
466 stat = write(dev->fd, block->buf, (size_t)wlen);
467 if (stat != (ssize_t)wlen) {
468 /* We should check for errno == ENOSPC, BUT many
469 * devices simply report EIO when the volume is full.
470 * With a little more thought we may be able to check
471 * capacity and distinguish real errors and EOT
472 * conditions. In any case, we probably want to
473 * simulate an End of Medium.
476 /* I have added the ifdefing here because it appears on
477 * FreeBSD where MTIOCERRSTAT is defined, this not only
478 * clears the error but clears the residual unwritten
479 * buffers -> data loss. As a consequence, on those
480 * systems (FreeBSD like), do the clrerror() only after
481 * the weof_dev() call.
483 clrerror_dev(dev, -1);
484 if (dev->dev_errno == 0) {
485 dev->dev_errno = ENOSPC; /* out of space */
487 Jmsg(jcr, M_ERROR, 0, _("Write error at %u:%u on device %s. ERR=%s.\n"),
488 dev->file, dev->block_num, dev->dev_name, strerror(dev->dev_errno));
490 dev->dev_errno = ENOSPC; /* out of space */
491 Jmsg(jcr, M_INFO, 0, _("End of medium at %u:%u on device %s. Write of %u bytes got %d.\n"),
492 dev->file, dev->block_num, dev->dev_name, wlen, stat);
495 Dmsg6(100, "=== Write error. size=%u rtn=%d dev_blk=%d blk_blk=%d errno=%d: ERR=%s\n",
496 wlen, stat, dev->block_num, block->BlockNumber, dev->dev_errno, strerror(dev->dev_errno));
498 block->write_failed = true;
499 if (weof_dev(dev, 1) != 0) { /* end the tape */
500 dev->VolCatInfo.VolCatErrors++;
501 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
503 Dmsg0(100, "dir_update_volume_info\n");
504 dev->VolCatInfo.VolCatFiles = dev->file;
505 dir_update_volume_info(jcr, dev, 0);
506 if (dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* end the tape */
507 dev->VolCatInfo.VolCatErrors++;
508 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
510 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
513 #define CHECK_LAST_BLOCK
514 #ifdef CHECK_LAST_BLOCK
516 * If the device is a tape and it supports backspace record,
517 * we backspace over one or two eof marks depending on
518 * how many we just wrote, then over the last record,
519 * then re-read it and verify that the block number is
522 if (dev->state & ST_TAPE && dev_cap(dev, CAP_BSR)) {
524 /* Now back up over what we wrote and read the last block */
525 if (!bsf_dev(dev, 1)) {
527 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
529 if (ok && dev_cap(dev, CAP_TWOEOF) && !bsf_dev(dev, 1)) {
531 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
533 /* Backspace over record */
534 if (ok && !bsr_dev(dev, 1)) {
536 Jmsg(jcr, M_ERROR, 0, _("Backspace record at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
538 * On FreeBSD systems, if the user got here, it is likely that his/her
539 * tape drive is "frozen". The correct thing to do is a
540 * rewind(), but if we do that, higher levels in cleaning up, will
541 * most likely write the EOS record over the beginning of the
542 * tape. The rewind *is* done later in mount.c when another
543 * tape is requested. Note, the clrerror_dev() call in bsr_dev()
544 * calls ioctl(MTCERRSTAT), which *should* fix the problem.
548 DEV_BLOCK *lblock = new_block(dev);
549 /* Note, this can destroy dev->errmsg */
550 if (!read_block_from_dev(jcr, dev, lblock, NO_BLOCK_NUMBER_CHECK)) {
551 Jmsg(jcr, M_ERROR, 0, _("Re-read last block at EOT failed. ERR=%s"), dev->errmsg);
553 if (lblock->BlockNumber+1 == block->BlockNumber) {
554 Jmsg(jcr, M_INFO, 0, _("Re-read of last block succeeded.\n"));
556 Jmsg(jcr, M_ERROR, 0, _(
557 "Re-read of last block failed. Last block=%u Current block=%u.\n"),
558 lblock->BlockNumber, block->BlockNumber);
568 /* We successfully wrote the block, now do housekeeping */
570 dev->VolCatInfo.VolCatBytes += block->binbuf;
571 dev->VolCatInfo.VolCatBlocks++;
572 dev->file_addr += wlen;
573 dev->EndBlock = dev->block_num;
574 dev->EndFile = dev->file;
576 block->BlockNumber++;
578 /* Update jcr values */
579 if (dev_state(dev, ST_TAPE)) {
580 jcr->EndBlock = dev->EndBlock;
581 jcr->EndFile = dev->EndFile;
583 jcr->EndBlock = (uint32_t)dev->file_addr;
584 jcr->EndFile = (uint32_t)(dev->file_addr >> 32);
586 if (jcr->VolFirstIndex == 0 && block->FirstIndex > 0) {
587 jcr->VolFirstIndex = block->FirstIndex;
589 if (block->LastIndex > 0) {
590 jcr->VolLastIndex = block->LastIndex;
592 jcr->WroteVol = true;
594 Dmsg2(190, "write_block: wrote block %d bytes=%d\n", dev->block_num,
601 * Read block with locking
604 int read_block_from_device(JCR *jcr, DEVICE *dev, DEV_BLOCK *block, bool check_block_numbers)
607 Dmsg0(90, "Enter read_block_from_device\n");
609 stat = read_block_from_dev(jcr, dev, block, check_block_numbers);
611 Dmsg0(90, "Leave read_block_from_device\n");
616 * Read the next block into the block structure and unserialize
617 * the block header. For a file, the block may be partially
618 * or completely in the current buffer.
620 int read_block_from_dev(JCR *jcr, DEVICE *dev, DEV_BLOCK *block, bool check_block_numbers)
624 uint32_t BlockNumber;
627 if (dev_state(dev, ST_EOT)) {
631 Dmsg1(100, "Full read() in read_block_from_device() len=%d\n",
635 Mmsg1(&dev->errmsg, _("Block buffer size looping problem on device %s\n"),
637 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
643 stat = read(dev->fd, block->buf, (size_t)block->buf_len);
645 dev->VolCatInfo.VolCatErrors++;
647 } while (stat == -1 && (errno == EINTR || errno == EIO) && retry++ < 11);
648 // Dmsg1(100, "read stat = %d\n", stat);
650 Dmsg1(90, "Read device got: ERR=%s\n", strerror(errno));
651 clrerror_dev(dev, -1);
653 Mmsg4(&dev->errmsg, _("Read error at file:block %d:%d on device %s. ERR=%s.\n"),
654 dev->file, dev->block_num, dev->dev_name, strerror(dev->dev_errno));
655 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
656 if (dev->state & ST_EOF) { /* EOF just seen? */
657 dev->state |= ST_EOT; /* yes, error => EOT */
661 Dmsg1(90, "Read device got %d bytes\n", stat);
662 if (stat == 0) { /* Got EOF ! */
663 dev->block_num = block->read_len = 0;
664 Mmsg1(&dev->errmsg, _("Read zero bytes on device %s.\n"), dev->dev_name);
665 if (dev->state & ST_EOF) { /* EOF already read? */
666 dev->state |= ST_EOT; /* yes, 2 EOFs => EOT */
670 dev->file++; /* increment file */
671 dev->state |= ST_EOF; /* set EOF read */
673 return 0; /* return eof */
675 /* Continue here for successful read */
676 block->read_len = stat; /* save length read */
677 if (block->read_len < BLKHDR2_LENGTH) {
678 Mmsg2(&dev->errmsg, _("Volume data error! Very short block of %d bytes on device %s discarded.\n"),
679 block->read_len, dev->dev_name);
680 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
681 dev->state |= ST_SHORT; /* set short block */
682 block->read_len = block->binbuf = 0;
683 return 0; /* return error */
686 BlockNumber = block->BlockNumber + 1;
687 if (!unser_block_header(jcr, dev, block)) {
693 * If the block is bigger than the buffer, we reposition for
694 * re-reading the block, allocate a buffer of the correct size,
697 if (block->block_len > block->buf_len) {
698 Mmsg2(&dev->errmsg, _("Block length %u is greater than buffer %u. Attempting recovery.\n"),
699 block->block_len, block->buf_len);
700 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
701 Pmsg1(000, "%s", dev->errmsg);
702 /* Attempt to reposition to re-read the block */
703 if (dev->state & ST_TAPE) {
704 Dmsg0(100, "Backspace record for reread.\n");
705 if (!bsr_dev(dev, 1)) {
706 Jmsg(jcr, M_ERROR, 0, "%s", strerror_dev(dev));
711 Dmsg0(100, "Seek to beginning of block for reread.\n");
712 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
713 pos -= block->read_len;
714 lseek(dev->fd, pos, SEEK_SET);
716 Mmsg1(&dev->errmsg, _("Setting block buffer size to %u bytes.\n"), block->block_len);
717 Jmsg(jcr, M_INFO, 0, "%s", dev->errmsg);
718 Pmsg1(000, "%s", dev->errmsg);
719 /* Set new block length */
720 dev->max_block_size = block->block_len;
721 block->buf_len = block->block_len;
722 free_memory(block->buf);
723 block->buf = get_memory(block->buf_len);
726 goto reread; /* re-read block with correct block size */
729 if (block->block_len > block->read_len) {
730 Mmsg3(&dev->errmsg, _("Volume data error! Short block at %u of %d bytes on device %s discarded.\n"),
731 dev->block_num, block->read_len, dev->dev_name);
732 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
733 dev->state |= ST_SHORT; /* set short block */
734 block->read_len = block->binbuf = 0;
735 return 0; /* return error */
738 dev->state &= ~(ST_EOF|ST_SHORT); /* clear EOF and short block */
739 dev->VolCatInfo.VolCatReads++;
740 dev->VolCatInfo.VolCatRBytes += block->read_len;
742 dev->VolCatInfo.VolCatBytes += block->block_len;
743 dev->VolCatInfo.VolCatBlocks++;
744 dev->file_addr += block->block_len;
745 dev->EndBlock = dev->block_num;
746 dev->EndFile = dev->file;
749 /* Update jcr values */
750 if (dev->state & ST_TAPE) {
751 jcr->EndBlock = dev->EndBlock;
752 jcr->EndFile = dev->EndFile;
754 jcr->EndBlock = (uint32_t)dev->file_addr;
755 jcr->EndFile = (uint32_t)(dev->file_addr >> 32);
759 * If we read a short block on disk,
760 * seek to beginning of next block. This saves us
761 * from shuffling blocks around in the buffer. Take a
762 * look at this from an efficiency stand point later, but
763 * it should only happen once at the end of each job.
765 * I've been lseek()ing negative relative to SEEK_CUR for 30
766 * years now. However, it seems that with the new off_t definition,
767 * it is not possible to seek negative amounts, so we use two
768 * lseek(). One to get the position, then the second to do an
769 * absolute positioning -- so much for efficiency. KES Sep 02.
771 Dmsg0(200, "At end of read block\n");
772 if (block->read_len > block->block_len && !(dev->state & ST_TAPE)) {
773 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
774 pos -= (block->read_len - block->block_len);
775 lseek(dev->fd, pos, SEEK_SET);
776 Dmsg2(100, "Did lseek blk_size=%d rdlen=%d\n", block->block_len,
779 Dmsg2(200, "Exit read_block read_len=%d block_len=%d\n",
780 block->read_len, block->block_len);
781 block->block_read = true;