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, const 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 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: false on failure (not a block)
212 static bool 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 dev->dev_errno = EIO;
236 Mmsg4(dev->errmsg, _("Volume data error at %u:%u! Wanted ID: \"%s\", got \"%s\". Buffer discarded.\n"),
237 dev->file, dev->block_num, BLKHDR1_ID, Id);
238 if (block->read_errors == 0 || verbose >= 2) {
239 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
241 block->read_errors++;
244 } else if (Id[3] == '2') {
245 unser_uint32(block->VolSessionId);
246 unser_uint32(block->VolSessionTime);
247 bhl = BLKHDR2_LENGTH;
249 block->bufp = block->buf + bhl;
250 if (strncmp(Id, BLKHDR2_ID, BLKHDR_ID_LENGTH) != 0) {
251 dev->dev_errno = EIO;
252 Mmsg4(dev->errmsg, _("Volume data error at %u:%u! Wanted ID: \"%s\", got \"%s\". Buffer discarded.\n"),
253 dev->file, dev->block_num, BLKHDR2_ID, Id);
254 if (block->read_errors == 0 || verbose >= 2) {
255 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
257 block->read_errors++;
261 dev->dev_errno = EIO;
262 Mmsg4(dev->errmsg, _("Volume data error at %u:%u! Wanted ID: \"%s\", got \"%s\". Buffer discarded.\n"),
263 dev->file, dev->block_num, BLKHDR2_ID, Id);
264 if (block->read_errors == 0 || verbose >= 2) {
265 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
267 block->read_errors++;
268 unser_uint32(block->VolSessionId);
269 unser_uint32(block->VolSessionTime);
274 if (block_len > MAX_BLOCK_LENGTH) {
275 dev->dev_errno = EIO;
276 Mmsg3(dev->errmsg, _("Volume data error at %u:%u! Block length %u is insane (too large), probably due to a bad archive.\n"),
277 dev->file, dev->block_num, block_len);
278 if (block->read_errors == 0 || verbose >= 2) {
279 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
281 block->read_errors++;
285 Dmsg1(190, "unser_block_header block_len=%d\n", block_len);
286 /* Find end of block or end of buffer whichever is smaller */
287 if (block_len > block->read_len) {
288 block_end = block->read_len;
290 block_end = block_len;
292 block->binbuf = block_end - bhl;
293 block->block_len = block_len;
294 block->BlockNumber = BlockNumber;
295 Dmsg3(190, "Read binbuf = %d %d block_len=%d\n", block->binbuf,
297 if (block_len <= block->read_len) {
298 BlockCheckSum = bcrc32((uint8_t *)block->buf+BLKHDR_CS_LENGTH,
299 block_len-BLKHDR_CS_LENGTH);
300 if (BlockCheckSum != CheckSum) {
301 dev->dev_errno = EIO;
302 Mmsg5(dev->errmsg, _("Volume data error at %u:%u! Block checksum mismatch in block %u: calc=%x blk=%x\n"),
303 dev->file, dev->block_num, (unsigned)BlockNumber, BlockCheckSum, CheckSum);
304 if (block->read_errors == 0 || verbose >= 2) {
305 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
307 block->read_errors++;
317 * Write a block to the device, with locking and unlocking
319 * Returns: true on success
323 bool write_block_to_device(DCR *dcr)
326 DEVICE *dev = dcr->dev;
330 stat = write_block_to_spool_file(dcr);
334 if (!dcr->dev_locked) {
339 * If a new volume has been mounted since our last write
340 * Create a JobMedia record for the previous volume written,
341 * and set new parameters to write this volume
342 * The same applies for if we are in a new file.
344 if (dcr->NewVol || dcr->NewFile) {
345 /* Create a jobmedia record for this job */
346 if (!dir_create_jobmedia_record(dcr)) {
347 dev->dev_errno = EIO;
348 Jmsg(jcr, M_FATAL, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
349 dcr->VolCatInfo.VolCatName, jcr->Job);
350 set_new_volume_parameters(dcr);
355 /* Note, setting a new volume also handles any pending new file */
356 set_new_volume_parameters(dcr);
357 dcr->NewFile = false; /* this handled for new file too */
359 set_new_file_parameters(dcr);
363 if (!write_block_to_dev(dcr)) {
364 if (job_canceled(jcr)) {
367 stat = fixup_device_block_write_error(dcr);
372 if (!dcr->dev_locked) {
379 * Write a block to the device
381 * Returns: true on success or EOT
382 * false on hard error
384 bool write_block_to_dev(DCR *dcr)
387 uint32_t wlen; /* length to write */
388 int hit_max1, hit_max2;
390 DEVICE *dev = dcr->dev;
392 DEV_BLOCK *block = dcr->block;
394 #ifdef NO_TAPE_WRITE_TEST
398 ASSERT(block->binbuf == ((uint32_t) (block->bufp - block->buf)));
400 /* dump_block(block, "before write"); */
401 if (dev->state & ST_WEOT) {
402 Dmsg0(100, "return write_block_to_dev with ST_WEOT\n");
403 dev->dev_errno = ENOSPC;
404 Jmsg(jcr, M_FATAL, 0, _("Cannot write block. Device at EOM.\n"));
407 wlen = block->binbuf;
408 if (wlen <= WRITE_BLKHDR_LENGTH) { /* Does block have data in it? */
409 Dmsg0(100, "return write_block_to_dev no data to write\n");
413 * Clear to the end of the buffer if it is not full,
414 * and on tape devices, apply min and fixed blocking.
416 if (wlen != block->buf_len) {
417 uint32_t blen; /* current buffer length */
419 Dmsg2(200, "binbuf=%d buf_len=%d\n", block->binbuf, block->buf_len);
422 /* Adjust write size to min/max for tapes only */
423 if (dev->state & ST_TAPE) {
424 /* check for fixed block size */
425 if (dev->min_block_size == dev->max_block_size) {
426 wlen = block->buf_len; /* fixed block size already rounded */
427 /* Check for min block size */
428 } else if (wlen < dev->min_block_size) {
429 wlen = ((dev->min_block_size + TAPE_BSIZE - 1) / TAPE_BSIZE) * TAPE_BSIZE;
430 /* Ensure size is rounded */
432 wlen = ((wlen + TAPE_BSIZE - 1) / TAPE_BSIZE) * TAPE_BSIZE;
436 memset(block->bufp, 0, wlen-blen); /* clear garbage */
440 ser_block_header(block);
442 /* Limit maximum Volume size to value specified by user */
443 hit_max1 = (dev->max_volume_size > 0) &&
444 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->max_volume_size;
445 hit_max2 = (dev->VolCatInfo.VolCatMaxBytes > 0) &&
446 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->VolCatInfo.VolCatMaxBytes;
447 if (hit_max1 || hit_max2) {
450 Dmsg0(10, "==== Output bytes Triggered medium max capacity.\n");
452 max_cap = dev->max_volume_size;
454 max_cap = dev->VolCatInfo.VolCatMaxBytes;
456 Jmsg(jcr, M_INFO, 0, _("User defined maximum volume capacity %s exceeded on device %s.\n"),
457 edit_uint64_with_commas(max_cap, ed1), dev->dev_name);
458 block->write_failed = true;
459 if (weof_dev(dev, 1) != 0) { /* end tape */
460 Jmsg(jcr, M_FATAL, 0, "%s", dev->errmsg);
461 dev->VolCatInfo.VolCatErrors++;
463 /* Don't do update after second EOF or file count will be wrong */
464 Dmsg0(100, "dir_update_volume_info\n");
465 dev->VolCatInfo.VolCatFiles = dev->file;
466 dir_update_volume_info(dcr, false);
467 if (dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* write eof */
468 /* This may not be fatal since we already wrote an EOF */
469 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
470 dev->VolCatInfo.VolCatErrors++;
472 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
473 dev->dev_errno = ENOSPC;
477 /* Limit maximum File size on volume to user specified value */
478 if ((dev->max_file_size > 0) &&
479 (dev->file_size+block->binbuf) >= dev->max_file_size) {
481 if (dev_state(dev, ST_TAPE) && weof_dev(dev, 1) != 0) { /* write eof */
483 Jmsg(jcr, M_FATAL, 0, "%s", dev->errmsg);
484 block->write_failed = true;
485 dev->VolCatInfo.VolCatErrors++;
486 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
487 Dmsg0(100, "dir_update_volume_info\n");
488 dev->VolCatInfo.VolCatFiles = dev->file;
489 dir_update_volume_info(dcr, false);
490 dev->dev_errno = ENOSPC;
494 /* Create a JobMedia record so restore can seek */
495 Dmsg0(100, "dir_update_volume_info\n");
496 dev->VolCatInfo.VolCatFiles = dev->file;
497 dir_update_volume_info(dcr, false);
498 if (!dir_create_jobmedia_record(dcr)) {
499 dev->dev_errno = EIO;
500 Jmsg(jcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
501 dcr->VolCatInfo.VolCatName, jcr->Job);
506 dev->file_size = 0; /* reset file size */
508 * Walk through all attached jcrs indicating the file has changed
510 Dmsg1(100, "Walk attached jcrs. Volume=%s\n", dev->VolCatInfo.VolCatName);
512 for (JCR *mjcr=NULL; (mjcr=next_attached_jcr(dev, mjcr)); ) {
513 if (mjcr->JobId == 0) {
514 continue; /* ignore console */
516 mjcr->dcr->NewFile = true; /* set reminder to do set_new_file_params */
520 * Walk through all attached dcrs setting flag to call
521 * set_new_file_parameters() when that dcr is next used.
524 foreach_dlist(mdcr, dev->attached_dcrs) {
525 if (mdcr->jcr->JobId == 0) {
528 mdcr->NewFile = true; /* set reminder to do set_new_file_params */
530 /* Set new file/block parameters for current dcr */
531 set_new_file_parameters(dcr);
534 dev->VolCatInfo.VolCatWrites++;
535 Dmsg1(200, "Write block of %u bytes\n", wlen);
536 #ifdef DEBUG_BLOCK_ZEROING
537 uint32_t *bp = (uint32_t *)block->buf;
538 if (bp[0] == 0 && bp[1] == 0 && bp[2] == 0 && block->buf[12] == 0) {
539 Jmsg0(jcr, M_ABORT, 0, "Write block header zeroed.\n");
543 stat = write(dev->fd, block->buf, (size_t)wlen);
545 #ifdef DEBUG_BLOCK_ZEROING
546 if (bp[0] == 0 && bp[1] == 0 && bp[2] == 0 && block->buf[12] == 0) {
547 Jmsg0(jcr, M_ABORT, 0, "Write block header zeroed.\n");
551 if (stat != (ssize_t)wlen) {
552 /* Some devices simply report EIO when the volume is full.
553 * With a little more thought we may be able to check
554 * capacity and distinguish real errors and EOT
555 * conditions. In any case, we probably want to
556 * simulate an End of Medium.
560 /* I have added the ifdefing here because it appears on
561 * FreeBSD where MTIOCERRSTAT is defined, this not only
562 * clears the error but clears the residual unwritten
563 * buffers -> data loss. As a consequence, on those
564 * systems (FreeBSD like), do the clrerror() only after
565 * the weof_dev() call.
567 clrerror_dev(dev, -1);
568 if (dev->dev_errno == 0) {
569 dev->dev_errno = ENOSPC; /* out of space */
571 if (dev->dev_errno != ENOSPC) {
572 Jmsg4(jcr, M_ERROR, 0, _("Write error at %u:%u on device %s. ERR=%s.\n"),
573 dev->file, dev->block_num, dev->dev_name, be.strerror());
576 dev->dev_errno = ENOSPC; /* out of space */
578 if (dev->dev_errno == ENOSPC) {
579 Jmsg(jcr, M_INFO, 0, _("End of Volume \"%s\" at %u:%u on device %s. Write of %u bytes got %d.\n"),
580 dev->VolCatInfo.VolCatName,
581 dev->file, dev->block_num, dev->dev_name, wlen, stat);
583 Dmsg6(100, "=== Write error. size=%u rtn=%d dev_blk=%d blk_blk=%d errno=%d: ERR=%s\n",
584 wlen, stat, dev->block_num, block->BlockNumber, dev->dev_errno, strerror(dev->dev_errno));
586 block->write_failed = true;
587 if (weof_dev(dev, 1) != 0) { /* end the tape */
588 dev->VolCatInfo.VolCatErrors++;
589 Jmsg(jcr, M_FATAL, 0, "%s", dev->errmsg);
592 Dmsg0(100, "dir_update_volume_info\n");
593 dev->VolCatInfo.VolCatFiles = dev->file;
594 dir_update_volume_info(dcr, false);
595 if (ok && dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* end the tape */
596 dev->VolCatInfo.VolCatErrors++;
597 /* This may not be fatal since we already wrote an EOF */
598 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
600 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
602 #define CHECK_LAST_BLOCK
603 #ifdef CHECK_LAST_BLOCK
605 * If the device is a tape and it supports backspace record,
606 * we backspace over one or two eof marks depending on
607 * how many we just wrote, then over the last record,
608 * then re-read it and verify that the block number is
611 if (ok && (dev->state & ST_TAPE) && dev_cap(dev, CAP_BSR)) {
612 /* Now back up over what we wrote and read the last block */
613 if (!bsf_dev(dev, 1)) {
615 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
617 if (ok && dev_cap(dev, CAP_TWOEOF) && !bsf_dev(dev, 1)) {
619 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
621 /* Backspace over record */
622 if (ok && !bsr_dev(dev, 1)) {
624 Jmsg(jcr, M_ERROR, 0, _("Backspace record at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
626 * On FreeBSD systems, if the user got here, it is likely that his/her
627 * tape drive is "frozen". The correct thing to do is a
628 * rewind(), but if we do that, higher levels in cleaning up, will
629 * most likely write the EOS record over the beginning of the
630 * tape. The rewind *is* done later in mount.c when another
631 * tape is requested. Note, the clrerror_dev() call in bsr_dev()
632 * calls ioctl(MTCERRSTAT), which *should* fix the problem.
636 DEV_BLOCK *lblock = new_block(dev);
637 /* Note, this can destroy dev->errmsg */
639 if (!read_block_from_dev(dcr, NO_BLOCK_NUMBER_CHECK)) {
640 Jmsg(jcr, M_ERROR, 0, _("Re-read last block at EOT failed. ERR=%s"), dev->errmsg);
642 if (lblock->BlockNumber+1 == block->BlockNumber) {
643 Jmsg(jcr, M_INFO, 0, _("Re-read of last block succeeded.\n"));
645 Jmsg(jcr, M_ERROR, 0, _(
646 "Re-read of last block failed. Last block=%u Current block=%u.\n"),
647 lblock->BlockNumber, block->BlockNumber);
658 /* We successfully wrote the block, now do housekeeping */
660 dev->VolCatInfo.VolCatBytes += block->binbuf;
661 dev->VolCatInfo.VolCatBlocks++;
662 dev->EndBlock = dev->block_num;
663 dev->EndFile = dev->file;
665 block->BlockNumber++;
667 /* Update dcr values */
668 if (dev_state(dev, ST_TAPE)) {
669 dcr->EndBlock = dev->EndBlock;
670 dcr->EndFile = dev->EndFile;
672 /* Save address of start of block just written */
673 dcr->EndBlock = (uint32_t)dev->file_addr;
674 dcr->EndFile = (uint32_t)(dev->file_addr >> 32);
676 if (dcr->VolFirstIndex == 0 && block->FirstIndex > 0) {
677 dcr->VolFirstIndex = block->FirstIndex;
679 if (block->LastIndex > 0) {
680 dcr->VolLastIndex = block->LastIndex;
682 dcr->WroteVol = true;
683 dev->file_addr += wlen; /* update file address */
684 dev->file_size += wlen;
686 Dmsg2(190, "write_block: wrote block %d bytes=%d\n", dev->block_num,
693 * Read block with locking
696 bool read_block_from_device(DCR *dcr, bool check_block_numbers)
699 DEVICE *dev = dcr->dev;
700 Dmsg0(90, "Enter read_block_from_device\n");
702 stat = read_block_from_dev(dcr, check_block_numbers);
704 Dmsg0(90, "Leave read_block_from_device\n");
709 * Read the next block into the block structure and unserialize
710 * the block header. For a file, the block may be partially
711 * or completely in the current buffer.
713 bool read_block_from_dev(DCR *dcr, bool check_block_numbers)
717 uint32_t BlockNumber;
720 DEVICE *dev = dcr->dev;
721 DEV_BLOCK *block = dcr->block;
723 if (dev_state(dev, ST_EOT)) {
727 Dmsg1(100, "Full read() in read_block_from_device() len=%d\n",
731 dev->dev_errno = EIO;
732 Mmsg1(dev->errmsg, _("Block buffer size looping problem on device %s\n"),
734 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
740 // uint32_t *bp = (uint32_t *)block->buf;
741 // Dmsg3(000, "Read %p %u at %llu\n", block->buf, block->buf_len, lseek(dev->fd, 0, SEEK_CUR));
743 stat = read(dev->fd, block->buf, (size_t)block->buf_len);
745 // Dmsg8(000, "stat=%d Csum=%u blen=%u bnum=%u %c%c%c%c\n",stat, bp[0],bp[1],bp[2],
746 // block->buf[12],block->buf[13],block->buf[14],block->buf[15]);
749 dev->VolCatInfo.VolCatErrors++;
751 } while (stat == -1 && (errno == EINTR || errno == EIO) && retry++ < 11);
753 clrerror_dev(dev, -1);
754 Dmsg1(90, "Read device got: ERR=%s\n", strerror(errno));
756 Mmsg4(dev->errmsg, _("Read error at file:blk %u:%u on device %s. ERR=%s.\n"),
757 dev->file, dev->block_num, dev->dev_name, strerror(dev->dev_errno));
758 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
759 if (dev->state & ST_EOF) { /* EOF just seen? */
760 dev->state |= ST_EOT; /* yes, error => EOT */
764 Dmsg1(90, "Read device got %d bytes\n", stat);
765 if (stat == 0) { /* Got EOF ! */
766 dev->block_num = block->read_len = 0;
767 Mmsg3(dev->errmsg, _("Read zero bytes at %u:%u on device %s.\n"),
768 dev->file, dev->block_num, dev->dev_name);
769 if (dev->state & ST_EOF) { /* EOF already read? */
770 dev->state |= ST_EOT; /* yes, 2 EOFs => EOT */
774 dev->file++; /* increment file */
775 dev->state |= ST_EOF; /* set EOF read */
777 return false; /* return eof */
779 /* Continue here for successful read */
780 block->read_len = stat; /* save length read */
781 if (block->read_len < BLKHDR2_LENGTH) {
782 dev->dev_errno = EIO;
783 Mmsg4(dev->errmsg, _("Volume data error at %u:%u! Very short block of %d bytes on device %s discarded.\n"),
784 dev->file, dev->block_num, block->read_len, dev->dev_name);
785 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
786 dev->state |= ST_SHORT; /* set short block */
787 block->read_len = block->binbuf = 0;
788 return false; /* return error */
791 BlockNumber = block->BlockNumber + 1;
792 if (!unser_block_header(jcr, dev, block)) {
794 dev->file_addr += block->read_len;
795 dev->file_size += block->read_len;
802 * If the block is bigger than the buffer, we reposition for
803 * re-reading the block, allocate a buffer of the correct size,
806 if (block->block_len > block->buf_len) {
807 dev->dev_errno = EIO;
808 Mmsg2(dev->errmsg, _("Block length %u is greater than buffer %u. Attempting recovery.\n"),
809 block->block_len, block->buf_len);
810 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
811 Pmsg1(000, "%s", dev->errmsg);
812 /* Attempt to reposition to re-read the block */
813 if (dev->state & ST_TAPE) {
814 Dmsg0(100, "Backspace record for reread.\n");
815 if (!bsr_dev(dev, 1)) {
816 Jmsg(jcr, M_ERROR, 0, "%s", strerror_dev(dev));
821 Dmsg0(200, "Seek to beginning of block for reread.\n");
822 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
823 pos -= block->read_len;
824 lseek(dev->fd, pos, SEEK_SET);
825 dev->file_addr = pos;
827 Mmsg1(dev->errmsg, _("Setting block buffer size to %u bytes.\n"), block->block_len);
828 Jmsg(jcr, M_INFO, 0, "%s", dev->errmsg);
829 Pmsg1(000, "%s", dev->errmsg);
830 /* Set new block length */
831 dev->max_block_size = block->block_len;
832 block->buf_len = block->block_len;
833 free_memory(block->buf);
834 block->buf = get_memory(block->buf_len);
837 goto reread; /* re-read block with correct block size */
840 if (block->block_len > block->read_len) {
841 dev->dev_errno = EIO;
842 Mmsg4(dev->errmsg, _("Volume data error at %u:%u! Short block of %d bytes on device %s discarded.\n"),
843 dev->file, dev->block_num, block->read_len, dev->dev_name);
844 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
845 dev->state |= ST_SHORT; /* set short block */
846 block->read_len = block->binbuf = 0;
847 return false; /* return error */
850 dev->state &= ~(ST_EOF|ST_SHORT); /* clear EOF and short block */
851 dev->VolCatInfo.VolCatReads++;
852 dev->VolCatInfo.VolCatRBytes += block->read_len;
854 dev->VolCatInfo.VolCatBytes += block->block_len;
855 dev->VolCatInfo.VolCatBlocks++;
856 dev->EndBlock = dev->block_num;
857 dev->EndFile = dev->file;
860 /* Update dcr values */
861 if (dev->state & ST_TAPE) {
862 dcr->EndBlock = dev->EndBlock;
863 dcr->EndFile = dev->EndFile;
865 dcr->EndBlock = (uint32_t)dev->file_addr;
866 dcr->EndFile = (uint32_t)(dev->file_addr >> 32);
867 dev->block_num = dcr->EndBlock;
868 dev->file = dcr->EndFile;
870 dev->file_addr += block->block_len;
871 dev->file_size += block->block_len;
874 * If we read a short block on disk,
875 * seek to beginning of next block. This saves us
876 * from shuffling blocks around in the buffer. Take a
877 * look at this from an efficiency stand point later, but
878 * it should only happen once at the end of each job.
880 * I've been lseek()ing negative relative to SEEK_CUR for 30
881 * years now. However, it seems that with the new off_t definition,
882 * it is not possible to seek negative amounts, so we use two
883 * lseek(). One to get the position, then the second to do an
884 * absolute positioning -- so much for efficiency. KES Sep 02.
886 Dmsg0(200, "At end of read block\n");
887 if (block->read_len > block->block_len && !(dev->state & ST_TAPE)) {
888 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
889 pos -= (block->read_len - block->block_len);
890 lseek(dev->fd, pos, SEEK_SET);
891 Dmsg2(200, "Did lseek blk_size=%d rdlen=%d\n", block->block_len,
893 dev->file_addr = pos;
894 dev->file_size = pos;
896 Dmsg2(200, "Exit read_block read_len=%d block_len=%d\n",
897 block->read_len, block->block_len);
898 block->block_read = true;