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);
127 * Duplicate an existing block (eblock)
129 DEV_BLOCK *dup_block(DEV_BLOCK *eblock)
131 DEV_BLOCK *block = (DEV_BLOCK *)get_memory(sizeof(DEV_BLOCK));
132 int buf_len = sizeof_pool_memory(eblock->buf);
134 memcpy(block, eblock, sizeof(DEV_BLOCK));
135 block->buf = get_memory(buf_len);
136 memcpy(block->buf, eblock->buf, buf_len);
142 * Only the first block checksum error was reported.
143 * If there are more, report it now.
145 void print_block_read_errors(JCR *jcr, DEV_BLOCK *block)
147 if (block->read_errors > 1) {
148 Jmsg(jcr, M_ERROR, 0, _("%d block read errors not printed.\n"),
156 void free_block(DEV_BLOCK *block)
158 Dmsg1(199, "free_block buffer %x\n", block->buf);
159 free_memory(block->buf);
160 Dmsg1(199, "free_block block %x\n", block);
161 free_memory((POOLMEM *)block);
164 /* Empty the block -- for writing */
165 void empty_block(DEV_BLOCK *block)
167 block->binbuf = WRITE_BLKHDR_LENGTH;
168 block->bufp = block->buf + block->binbuf;
170 block->write_failed = false;
171 block->block_read = false;
172 block->FirstIndex = block->LastIndex = 0;
176 * Create block header just before write. The space
177 * in the buffer should have already been reserved by
180 static void ser_block_header(DEV_BLOCK *block)
183 uint32_t CheckSum = 0;
184 uint32_t block_len = block->binbuf;
186 Dmsg1(190, "ser_block_header: block_len=%d\n", block_len);
187 ser_begin(block->buf, BLKHDR2_LENGTH);
188 ser_uint32(CheckSum);
189 ser_uint32(block_len);
190 ser_uint32(block->BlockNumber);
191 ser_bytes(WRITE_BLKHDR_ID, BLKHDR_ID_LENGTH);
192 if (BLOCK_VER >= 2) {
193 ser_uint32(block->VolSessionId);
194 ser_uint32(block->VolSessionTime);
197 /* Checksum whole block except for the checksum */
198 CheckSum = bcrc32((uint8_t *)block->buf+BLKHDR_CS_LENGTH,
199 block_len-BLKHDR_CS_LENGTH);
200 Dmsg1(190, "ser_bloc_header: checksum=%x\n", CheckSum);
201 ser_begin(block->buf, BLKHDR2_LENGTH);
202 ser_uint32(CheckSum); /* now add checksum to block header */
206 * Unserialize the block header for reading block.
207 * This includes setting all the buffer pointers correctly.
209 * Returns: 0 on failure (not a block)
212 static int unser_block_header(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
215 char Id[BLKHDR_ID_LENGTH+1];
216 uint32_t CheckSum, BlockCheckSum;
219 uint32_t BlockNumber;
222 unser_begin(block->buf, BLKHDR_LENGTH);
223 unser_uint32(CheckSum);
224 unser_uint32(block_len);
225 unser_uint32(BlockNumber);
226 unser_bytes(Id, BLKHDR_ID_LENGTH);
227 ASSERT(unser_length(block->buf) == BLKHDR1_LENGTH);
229 Id[BLKHDR_ID_LENGTH] = 0;
231 bhl = BLKHDR1_LENGTH;
233 block->bufp = block->buf + bhl;
234 if (strncmp(Id, BLKHDR1_ID, BLKHDR_ID_LENGTH) != 0) {
235 Mmsg2(&dev->errmsg, _("Volume data error! Wanted ID: %s, got %s. Buffer discarded.\n"),
237 if (block->read_errors == 0 || verbose >= 2) {
238 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
240 block->read_errors++;
243 } else if (Id[3] == '2') {
244 unser_uint32(block->VolSessionId);
245 unser_uint32(block->VolSessionTime);
246 bhl = BLKHDR2_LENGTH;
248 block->bufp = block->buf + bhl;
249 if (strncmp(Id, BLKHDR2_ID, BLKHDR_ID_LENGTH) != 0) {
250 Mmsg2(&dev->errmsg, _("Volume data error! Wanted ID: %s, got %s. Buffer discarded.\n"),
252 if (block->read_errors == 0 || verbose >= 2) {
253 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
255 block->read_errors++;
259 Mmsg1(&dev->errmsg, _("Volume data error! Wanted block-id BB02, got %s. Buffer discarded.\n"), Id);
260 if (block->read_errors == 0 || verbose >= 2) {
261 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
263 block->read_errors++;
268 if (block_len > MAX_BLOCK_LENGTH) {
269 Mmsg1(&dev->errmsg, _("Volume data error! Block length %u is insane (too large), probably due to a bad archive.\n"),
271 if (block->read_errors == 0 || verbose >= 2) {
272 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
274 block->read_errors++;
278 Dmsg1(190, "unser_block_header block_len=%d\n", block_len);
279 /* Find end of block or end of buffer whichever is smaller */
280 if (block_len > block->read_len) {
281 block_end = block->read_len;
283 block_end = block_len;
285 block->binbuf = block_end - bhl;
286 block->block_len = block_len;
287 block->BlockNumber = BlockNumber;
288 Dmsg3(190, "Read binbuf = %d %d block_len=%d\n", block->binbuf,
290 if (block_len <= block->read_len) {
291 BlockCheckSum = bcrc32((uint8_t *)block->buf+BLKHDR_CS_LENGTH,
292 block_len-BLKHDR_CS_LENGTH);
293 if (BlockCheckSum != CheckSum) {
294 Mmsg3(&dev->errmsg, _("Volume data error! Block checksum mismatch in block %u: calc=%x blk=%x\n"),
295 (unsigned)BlockNumber, BlockCheckSum, CheckSum);
296 if (block->read_errors == 0 || verbose >= 2) {
297 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
299 block->read_errors++;
307 * Write a block to the device, with locking and unlocking
309 * Returns: 1 on success
313 int write_block_to_device(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
319 * If a new volume has been mounted since our last write
320 * Create a JobMedia record for the previous volume written,
321 * and set new parameters to write this volume
322 * The same applies for if we are in a new file.
324 if (jcr->NewVol || jcr->NewFile) {
325 /* Create a jobmedia record for this job */
326 if (!dir_create_jobmedia_record(jcr)) {
327 Jmsg(jcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
328 jcr->VolCatInfo.VolCatName, jcr->Job);
329 set_new_volume_parameters(jcr, dev);
334 /* Note, setting a new volume also handles any pending new file */
335 set_new_volume_parameters(jcr, dev);
336 jcr->NewFile = false; /* this handled for new file too */
338 set_new_file_parameters(jcr, dev);
342 if (!write_block_to_dev(jcr, dev, block)) {
343 stat = fixup_device_block_write_error(jcr, dev, block);
351 * Write a block to the device
353 * Returns: 1 on success or EOT
356 int write_block_to_dev(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
359 uint32_t wlen; /* length to write */
360 int hit_max1, hit_max2;
363 #ifdef NO_TAPE_WRITE_TEST
367 ASSERT(block->binbuf == ((uint32_t) (block->bufp - block->buf)));
369 /* dump_block(block, "before write"); */
370 if (dev->state & ST_WEOT) {
371 Dmsg0(100, "return write_block_to_dev with ST_WEOT\n");
372 Jmsg(jcr, M_FATAL, 0, _("Cannot write block. Device at EOM.\n"));
375 wlen = block->binbuf;
376 if (wlen <= WRITE_BLKHDR_LENGTH) { /* Does block have data in it? */
377 Dmsg0(100, "return write_block_to_dev no data to write\n");
381 * Clear to the end of the buffer if it is not full,
382 * and on tape devices, apply min and fixed blocking.
384 if (wlen != block->buf_len) {
385 uint32_t blen; /* current buffer length */
387 Dmsg2(200, "binbuf=%d buf_len=%d\n", block->binbuf, block->buf_len);
390 /* Adjust write size to min/max for tapes only */
391 if (dev->state & ST_TAPE) {
392 if (wlen < dev->min_block_size) {
393 wlen = ((dev->min_block_size + TAPE_BSIZE - 1) / TAPE_BSIZE) * TAPE_BSIZE;
395 /* check for fixed block size */
396 if (dev->min_block_size == dev->max_block_size) {
397 wlen = block->buf_len; /* fixed block size already rounded */
401 memset(block->bufp, 0, wlen-blen); /* clear garbage */
405 ser_block_header(block);
407 /* Limit maximum Volume size to value specified by user */
408 hit_max1 = (dev->max_volume_size > 0) &&
409 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->max_volume_size;
410 hit_max2 = (dev->VolCatInfo.VolCatMaxBytes > 0) &&
411 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->VolCatInfo.VolCatMaxBytes;
412 if (hit_max1 || hit_max2) {
415 Dmsg0(10, "==== Output bytes Triggered medium max capacity.\n");
417 max_cap = dev->max_volume_size;
419 max_cap = dev->VolCatInfo.VolCatMaxBytes;
421 Jmsg(jcr, M_INFO, 0, _("User defined maximum volume capacity %s exceeded on device %s.\n"),
422 edit_uint64_with_commas(max_cap, ed1), dev->dev_name);
423 block->write_failed = true;
424 if (weof_dev(dev, 1) != 0) { /* end tape */
425 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
426 dev->VolCatInfo.VolCatErrors++;
428 /* Don't do update after second EOF or file count will be wrong */
429 Dmsg0(100, "dir_update_volume_info\n");
430 dev->VolCatInfo.VolCatFiles = dev->file;
431 dir_update_volume_info(jcr, dev, 0);
432 if (dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* write eof */
433 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
434 dev->VolCatInfo.VolCatErrors++;
436 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
440 /* Limit maximum File size on volume to user specified value */
441 if (dev_state(dev, ST_TAPE)) {
442 if ((dev->max_file_size > 0) &&
443 (dev->file_addr+block->binbuf) >= dev->max_file_size) {
446 if (weof_dev(dev, 1) != 0) { /* write eof */
447 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
448 block->write_failed = true;
449 dev->VolCatInfo.VolCatErrors++;
450 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
451 Dmsg0(100, "dir_update_volume_info\n");
452 dev->VolCatInfo.VolCatFiles = dev->file;
453 dir_update_volume_info(jcr, dev, 0);
457 /* Do bookkeeping to handle EOF just written */
458 Dmsg0(100, "dir_update_volume_info\n");
459 dev->VolCatInfo.VolCatFiles = dev->file;
460 dir_update_volume_info(jcr, dev, 0);
461 if (!dir_create_jobmedia_record(jcr)) {
462 Jmsg(jcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
463 jcr->VolCatInfo.VolCatName, jcr->Job);
467 * Walk through all attached jcrs indicating the file has changed
469 Dmsg1(100, "Walk attached jcrs. Volume=%s\n", dev->VolCatInfo.VolCatName);
470 for (JCR *mjcr=NULL; (mjcr=next_attached_jcr(dev, mjcr)); ) {
471 if (mjcr->JobId == 0) {
472 continue; /* ignore console */
474 mjcr->NewFile = true; /* set reminder to do set_new_file_params */
476 set_new_file_parameters(jcr, dev);
480 dev->VolCatInfo.VolCatWrites++;
481 Dmsg1(300, "Write block of %u bytes\n", wlen);
482 stat = write(dev->fd, block->buf, (size_t)wlen);
483 if (stat != (ssize_t)wlen) {
484 /* We should check for errno == ENOSPC, BUT many
485 * devices simply report EIO when the volume is full.
486 * With a little more thought we may be able to check
487 * capacity and distinguish real errors and EOT
488 * conditions. In any case, we probably want to
489 * simulate an End of Medium.
492 /* I have added the ifdefing here because it appears on
493 * FreeBSD where MTIOCERRSTAT is defined, this not only
494 * clears the error but clears the residual unwritten
495 * buffers -> data loss. As a consequence, on those
496 * systems (FreeBSD like), do the clrerror() only after
497 * the weof_dev() call.
499 clrerror_dev(dev, -1);
500 if (dev->dev_errno == 0) {
501 dev->dev_errno = ENOSPC; /* out of space */
503 Jmsg(jcr, M_ERROR, 0, _("Write error at %u:%u on device %s. ERR=%s.\n"),
504 dev->file, dev->block_num, dev->dev_name, strerror(dev->dev_errno));
506 dev->dev_errno = ENOSPC; /* out of space */
507 Jmsg(jcr, M_INFO, 0, _("End of medium at %u:%u on device %s. Write of %u bytes got %d.\n"),
508 dev->file, dev->block_num, dev->dev_name, wlen, stat);
511 Dmsg6(100, "=== Write error. size=%u rtn=%d dev_blk=%d blk_blk=%d errno=%d: ERR=%s\n",
512 wlen, stat, dev->block_num, block->BlockNumber, dev->dev_errno, strerror(dev->dev_errno));
514 block->write_failed = true;
515 if (weof_dev(dev, 1) != 0) { /* end the tape */
516 dev->VolCatInfo.VolCatErrors++;
517 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
519 Dmsg0(100, "dir_update_volume_info\n");
520 dev->VolCatInfo.VolCatFiles = dev->file;
521 dir_update_volume_info(jcr, dev, 0);
522 if (dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* end the tape */
523 dev->VolCatInfo.VolCatErrors++;
524 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
526 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
529 #define CHECK_LAST_BLOCK
530 #ifdef CHECK_LAST_BLOCK
532 * If the device is a tape and it supports backspace record,
533 * we backspace over one or two eof marks depending on
534 * how many we just wrote, then over the last record,
535 * then re-read it and verify that the block number is
538 if (dev->state & ST_TAPE && dev_cap(dev, CAP_BSR)) {
540 /* Now back up over what we wrote and read the last block */
541 if (!bsf_dev(dev, 1)) {
543 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
545 if (ok && dev_cap(dev, CAP_TWOEOF) && !bsf_dev(dev, 1)) {
547 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
549 /* Backspace over record */
550 if (ok && !bsr_dev(dev, 1)) {
552 Jmsg(jcr, M_ERROR, 0, _("Backspace record at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
554 * On FreeBSD systems, if the user got here, it is likely that his/her
555 * tape drive is "frozen". The correct thing to do is a
556 * rewind(), but if we do that, higher levels in cleaning up, will
557 * most likely write the EOS record over the beginning of the
558 * tape. The rewind *is* done later in mount.c when another
559 * tape is requested. Note, the clrerror_dev() call in bsr_dev()
560 * calls ioctl(MTCERRSTAT), which *should* fix the problem.
564 DEV_BLOCK *lblock = new_block(dev);
565 /* Note, this can destroy dev->errmsg */
566 if (!read_block_from_dev(jcr, dev, lblock, NO_BLOCK_NUMBER_CHECK)) {
567 Jmsg(jcr, M_ERROR, 0, _("Re-read last block at EOT failed. ERR=%s"), dev->errmsg);
569 if (lblock->BlockNumber+1 == block->BlockNumber) {
570 Jmsg(jcr, M_INFO, 0, _("Re-read of last block succeeded.\n"));
572 Jmsg(jcr, M_ERROR, 0, _(
573 "Re-read of last block failed. Last block=%u Current block=%u.\n"),
574 lblock->BlockNumber, block->BlockNumber);
584 /* We successfully wrote the block, now do housekeeping */
586 dev->VolCatInfo.VolCatBytes += block->binbuf;
587 dev->VolCatInfo.VolCatBlocks++;
588 dev->file_addr += wlen;
589 dev->EndBlock = dev->block_num;
590 dev->EndFile = dev->file;
592 block->BlockNumber++;
594 /* Update jcr values */
595 if (dev_state(dev, ST_TAPE)) {
596 jcr->EndBlock = dev->EndBlock;
597 jcr->EndFile = dev->EndFile;
599 jcr->EndBlock = (uint32_t)dev->file_addr;
600 jcr->EndFile = (uint32_t)(dev->file_addr >> 32);
602 if (jcr->VolFirstIndex == 0 && block->FirstIndex > 0) {
603 jcr->VolFirstIndex = block->FirstIndex;
605 if (block->LastIndex > 0) {
606 jcr->VolLastIndex = block->LastIndex;
608 jcr->WroteVol = true;
610 Dmsg2(190, "write_block: wrote block %d bytes=%d\n", dev->block_num,
617 * Read block with locking
620 int read_block_from_device(JCR *jcr, DEVICE *dev, DEV_BLOCK *block, bool check_block_numbers)
623 Dmsg0(90, "Enter read_block_from_device\n");
625 stat = read_block_from_dev(jcr, dev, block, check_block_numbers);
627 Dmsg0(90, "Leave read_block_from_device\n");
632 * Read the next block into the block structure and unserialize
633 * the block header. For a file, the block may be partially
634 * or completely in the current buffer.
636 int read_block_from_dev(JCR *jcr, DEVICE *dev, DEV_BLOCK *block, bool check_block_numbers)
640 uint32_t BlockNumber;
643 if (dev_state(dev, ST_EOT)) {
647 Dmsg1(100, "Full read() in read_block_from_device() len=%d\n",
651 Mmsg1(&dev->errmsg, _("Block buffer size looping problem on device %s\n"),
653 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
659 stat = read(dev->fd, block->buf, (size_t)block->buf_len);
661 dev->VolCatInfo.VolCatErrors++;
663 } while (stat == -1 && (errno == EINTR || errno == EIO) && retry++ < 11);
664 // Dmsg1(100, "read stat = %d\n", stat);
666 Dmsg1(90, "Read device got: ERR=%s\n", strerror(errno));
667 clrerror_dev(dev, -1);
669 Mmsg4(&dev->errmsg, _("Read error at file:block %d:%d on device %s. ERR=%s.\n"),
670 dev->file, dev->block_num, dev->dev_name, strerror(dev->dev_errno));
671 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
672 if (dev->state & ST_EOF) { /* EOF just seen? */
673 dev->state |= ST_EOT; /* yes, error => EOT */
677 Dmsg1(90, "Read device got %d bytes\n", stat);
678 if (stat == 0) { /* Got EOF ! */
679 dev->block_num = block->read_len = 0;
680 Mmsg1(&dev->errmsg, _("Read zero bytes on device %s.\n"), dev->dev_name);
681 if (dev->state & ST_EOF) { /* EOF already read? */
682 dev->state |= ST_EOT; /* yes, 2 EOFs => EOT */
686 dev->file++; /* increment file */
687 dev->state |= ST_EOF; /* set EOF read */
689 return 0; /* return eof */
691 /* Continue here for successful read */
692 block->read_len = stat; /* save length read */
693 if (block->read_len < BLKHDR2_LENGTH) {
694 Mmsg2(&dev->errmsg, _("Volume data error! Very short block of %d bytes on device %s discarded.\n"),
695 block->read_len, dev->dev_name);
696 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
697 dev->state |= ST_SHORT; /* set short block */
698 block->read_len = block->binbuf = 0;
699 return 0; /* return error */
702 BlockNumber = block->BlockNumber + 1;
703 if (!unser_block_header(jcr, dev, block)) {
709 * If the block is bigger than the buffer, we reposition for
710 * re-reading the block, allocate a buffer of the correct size,
713 if (block->block_len > block->buf_len) {
714 Mmsg2(&dev->errmsg, _("Block length %u is greater than buffer %u. Attempting recovery.\n"),
715 block->block_len, block->buf_len);
716 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
717 Pmsg1(000, "%s", dev->errmsg);
718 /* Attempt to reposition to re-read the block */
719 if (dev->state & ST_TAPE) {
720 Dmsg0(100, "Backspace record for reread.\n");
721 if (!bsr_dev(dev, 1)) {
722 Jmsg(jcr, M_ERROR, 0, "%s", strerror_dev(dev));
727 Dmsg0(100, "Seek to beginning of block for reread.\n");
728 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
729 pos -= block->read_len;
730 lseek(dev->fd, pos, SEEK_SET);
732 Mmsg1(&dev->errmsg, _("Setting block buffer size to %u bytes.\n"), block->block_len);
733 Jmsg(jcr, M_INFO, 0, "%s", dev->errmsg);
734 Pmsg1(000, "%s", dev->errmsg);
735 /* Set new block length */
736 dev->max_block_size = block->block_len;
737 block->buf_len = block->block_len;
738 free_memory(block->buf);
739 block->buf = get_memory(block->buf_len);
742 goto reread; /* re-read block with correct block size */
745 if (block->block_len > block->read_len) {
746 Mmsg3(&dev->errmsg, _("Volume data error! Short block at %u of %d bytes on device %s discarded.\n"),
747 dev->block_num, block->read_len, dev->dev_name);
748 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
749 dev->state |= ST_SHORT; /* set short block */
750 block->read_len = block->binbuf = 0;
751 return 0; /* return error */
754 dev->state &= ~(ST_EOF|ST_SHORT); /* clear EOF and short block */
755 dev->VolCatInfo.VolCatReads++;
756 dev->VolCatInfo.VolCatRBytes += block->read_len;
758 dev->VolCatInfo.VolCatBytes += block->block_len;
759 dev->VolCatInfo.VolCatBlocks++;
760 dev->file_addr += block->block_len;
761 dev->EndBlock = dev->block_num;
762 dev->EndFile = dev->file;
765 /* Update jcr values */
766 if (dev->state & ST_TAPE) {
767 jcr->EndBlock = dev->EndBlock;
768 jcr->EndFile = dev->EndFile;
770 jcr->EndBlock = (uint32_t)dev->file_addr;
771 jcr->EndFile = (uint32_t)(dev->file_addr >> 32);
775 * If we read a short block on disk,
776 * seek to beginning of next block. This saves us
777 * from shuffling blocks around in the buffer. Take a
778 * look at this from an efficiency stand point later, but
779 * it should only happen once at the end of each job.
781 * I've been lseek()ing negative relative to SEEK_CUR for 30
782 * years now. However, it seems that with the new off_t definition,
783 * it is not possible to seek negative amounts, so we use two
784 * lseek(). One to get the position, then the second to do an
785 * absolute positioning -- so much for efficiency. KES Sep 02.
787 Dmsg0(200, "At end of read block\n");
788 if (block->read_len > block->block_len && !(dev->state & ST_TAPE)) {
789 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
790 pos -= (block->read_len - block->block_len);
791 lseek(dev->fd, pos, SEEK_SET);
792 Dmsg2(100, "Did lseek blk_size=%d rdlen=%d\n", block->block_len,
795 Dmsg2(200, "Exit read_block read_len=%d block_len=%d\n",
796 block->read_len, block->block_len);
797 block->block_read = true;