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 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 dev->dev_errno = EIO;
236 Mmsg2(&dev->errmsg, _("Volume data error! Wanted ID: %s, got %s. Buffer discarded.\n"),
238 if (block->read_errors == 0 || verbose >= 2) {
239 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
241 block->read_errors++;
246 } else if (Id[3] == '2') {
247 unser_uint32(block->VolSessionId);
248 unser_uint32(block->VolSessionTime);
249 bhl = BLKHDR2_LENGTH;
251 block->bufp = block->buf + bhl;
252 if (strncmp(Id, BLKHDR2_ID, BLKHDR_ID_LENGTH) != 0) {
253 dev->dev_errno = EIO;
254 Mmsg2(&dev->errmsg, _("Volume data error! Wanted ID: %s, got %s. Buffer discarded.\n"),
256 if (block->read_errors == 0 || verbose >= 2) {
257 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
259 block->read_errors++;
265 dev->dev_errno = EIO;
266 Mmsg1(&dev->errmsg, _("Volume data error! Wanted block-id BB02, got %s. Buffer discarded.\n"), Id);
267 if (block->read_errors == 0 || verbose >= 2) {
268 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
270 block->read_errors++;
274 unser_uint32(block->VolSessionId);
275 unser_uint32(block->VolSessionTime);
276 bhl = BLKHDR2_LENGTH;
278 block->bufp = block->buf + bhl;
282 if (block_len > MAX_BLOCK_LENGTH) {
283 dev->dev_errno = EIO;
284 Mmsg1(&dev->errmsg, _("Volume data error! Block length %u is insane (too large), probably due to a bad archive.\n"),
286 if (block->read_errors == 0 || verbose >= 2) {
287 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
289 block->read_errors++;
295 Dmsg1(190, "unser_block_header block_len=%d\n", block_len);
296 /* Find end of block or end of buffer whichever is smaller */
297 if (block_len > block->read_len) {
298 block_end = block->read_len;
300 block_end = block_len;
302 block->binbuf = block_end - bhl;
303 block->block_len = block_len;
304 block->BlockNumber = BlockNumber;
305 Dmsg3(190, "Read binbuf = %d %d block_len=%d\n", block->binbuf,
307 if (block_len <= block->read_len) {
308 BlockCheckSum = bcrc32((uint8_t *)block->buf+BLKHDR_CS_LENGTH,
309 block_len-BLKHDR_CS_LENGTH);
310 if (BlockCheckSum != CheckSum) {
311 dev->dev_errno = EIO;
312 Mmsg3(&dev->errmsg, _("Volume data error! Block checksum mismatch in block %u: calc=%x blk=%x\n"),
313 (unsigned)BlockNumber, BlockCheckSum, CheckSum);
314 if (block->read_errors == 0 || verbose >= 2) {
315 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
317 block->read_errors++;
327 * Write a block to the device, with locking and unlocking
329 * Returns: 1 on success
333 int write_block_to_device(DCR *dcr, DEV_BLOCK *block)
336 DEVICE *dev = dcr->dev;
341 stat = write_block_to_spool_file(dcr, block);
345 if (!dcr->dev_locked) {
350 * If a new volume has been mounted since our last write
351 * Create a JobMedia record for the previous volume written,
352 * and set new parameters to write this volume
353 * The same applies for if we are in a new file.
355 if (dcr->NewVol || dcr->NewFile) {
356 /* Create a jobmedia record for this job */
357 if (!dir_create_jobmedia_record(jcr)) {
358 dev->dev_errno = EIO;
359 Jmsg(jcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
360 jcr->VolCatInfo.VolCatName, jcr->Job);
361 set_new_volume_parameters(jcr, dev);
366 /* Note, setting a new volume also handles any pending new file */
367 set_new_volume_parameters(jcr, dev);
368 dcr->NewFile = false; /* this handled for new file too */
370 set_new_file_parameters(jcr, dev);
374 if (!write_block_to_dev(dcr, block)) {
375 stat = fixup_device_block_write_error(jcr, dev, block);
379 if (!dcr->dev_locked) {
386 * Write a block to the device
388 * Returns: 1 on success or EOT
391 int write_block_to_dev(DCR *dcr, DEV_BLOCK *block)
394 uint32_t wlen; /* length to write */
395 int hit_max1, hit_max2;
397 DEVICE *dev = dcr->dev;
400 #ifdef NO_TAPE_WRITE_TEST
404 ASSERT(block->binbuf == ((uint32_t) (block->bufp - block->buf)));
406 /* dump_block(block, "before write"); */
407 if (dev->state & ST_WEOT) {
408 Dmsg0(100, "return write_block_to_dev with ST_WEOT\n");
409 dev->dev_errno = ENOSPC;
410 Jmsg(jcr, M_FATAL, 0, _("Cannot write block. Device at EOM.\n"));
413 wlen = block->binbuf;
414 if (wlen <= WRITE_BLKHDR_LENGTH) { /* Does block have data in it? */
415 Dmsg0(100, "return write_block_to_dev no data to write\n");
419 * Clear to the end of the buffer if it is not full,
420 * and on tape devices, apply min and fixed blocking.
422 if (wlen != block->buf_len) {
423 uint32_t blen; /* current buffer length */
425 Dmsg2(200, "binbuf=%d buf_len=%d\n", block->binbuf, block->buf_len);
428 /* Adjust write size to min/max for tapes only */
429 if (dev->state & ST_TAPE) {
430 /* check for fixed block size */
431 if (dev->min_block_size == dev->max_block_size) {
432 wlen = block->buf_len; /* fixed block size already rounded */
433 /* Check for min block size */
434 } else if (wlen < dev->min_block_size) {
435 wlen = ((dev->min_block_size + TAPE_BSIZE - 1) / TAPE_BSIZE) * TAPE_BSIZE;
436 /* Ensure size is rounded */
438 wlen = ((wlen + TAPE_BSIZE - 1) / TAPE_BSIZE) * TAPE_BSIZE;
442 memset(block->bufp, 0, wlen-blen); /* clear garbage */
446 ser_block_header(block);
448 /* Limit maximum Volume size to value specified by user */
449 hit_max1 = (dev->max_volume_size > 0) &&
450 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->max_volume_size;
451 hit_max2 = (dev->VolCatInfo.VolCatMaxBytes > 0) &&
452 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->VolCatInfo.VolCatMaxBytes;
453 if (hit_max1 || hit_max2) {
456 Dmsg0(10, "==== Output bytes Triggered medium max capacity.\n");
458 max_cap = dev->max_volume_size;
460 max_cap = dev->VolCatInfo.VolCatMaxBytes;
462 Jmsg(jcr, M_INFO, 0, _("User defined maximum volume capacity %s exceeded on device %s.\n"),
463 edit_uint64_with_commas(max_cap, ed1), dev->dev_name);
464 block->write_failed = true;
465 if (weof_dev(dev, 1) != 0) { /* end tape */
466 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
467 dev->VolCatInfo.VolCatErrors++;
469 /* Don't do update after second EOF or file count will be wrong */
470 Dmsg0(100, "dir_update_volume_info\n");
471 dev->VolCatInfo.VolCatFiles = dev->file;
472 dir_update_volume_info(jcr, dev, 0);
473 if (dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* write eof */
474 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
475 dev->VolCatInfo.VolCatErrors++;
477 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
478 dev->dev_errno = ENOSPC;
482 /* Limit maximum File size on volume to user specified value */
483 if ((dev->max_file_size > 0) &&
484 (dev->file_size+block->binbuf) >= dev->max_file_size) {
486 if (dev_state(dev, ST_TAPE) && weof_dev(dev, 1) != 0) { /* write eof */
488 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
489 block->write_failed = true;
490 dev->VolCatInfo.VolCatErrors++;
491 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
492 Dmsg0(100, "dir_update_volume_info\n");
493 dev->VolCatInfo.VolCatFiles = dev->file;
494 dir_update_volume_info(jcr, dev, 0);
495 dev->dev_errno = ENOSPC;
499 /* Create a JobMedia record so restore can seek */
500 Dmsg0(100, "dir_update_volume_info\n");
501 dev->VolCatInfo.VolCatFiles = dev->file;
502 dir_update_volume_info(jcr, dev, 0);
503 if (!dir_create_jobmedia_record(jcr)) {
504 dev->dev_errno = EIO;
505 Jmsg(jcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
506 dcr->VolCatInfo.VolCatName, jcr->Job);
511 dev->file_size = 0; /* reset file size */
513 * Walk through all attached jcrs indicating the file has changed
515 Dmsg1(100, "Walk attached jcrs. Volume=%s\n", dev->VolCatInfo.VolCatName);
516 for (JCR *mjcr=NULL; (mjcr=next_attached_jcr(dev, mjcr)); ) {
517 if (mjcr->JobId == 0) {
518 continue; /* ignore console */
520 mjcr->dcr->NewFile = true; /* set reminder to do set_new_file_params */
522 set_new_file_parameters(jcr, dev);
525 dev->VolCatInfo.VolCatWrites++;
526 Dmsg1(300, "Write block of %u bytes\n", wlen);
527 stat = write(dev->fd, block->buf, (size_t)wlen);
528 if (stat != (ssize_t)wlen) {
529 /* We should check for errno == ENOSPC, BUT many
530 * devices simply report EIO when the volume is full.
531 * With a little more thought we may be able to check
532 * capacity and distinguish real errors and EOT
533 * conditions. In any case, we probably want to
534 * simulate an End of Medium.
537 /* I have added the ifdefing here because it appears on
538 * FreeBSD where MTIOCERRSTAT is defined, this not only
539 * clears the error but clears the residual unwritten
540 * buffers -> data loss. As a consequence, on those
541 * systems (FreeBSD like), do the clrerror() only after
542 * the weof_dev() call.
544 clrerror_dev(dev, -1);
545 if (dev->dev_errno == 0) {
546 dev->dev_errno = ENOSPC; /* out of space */
548 Jmsg(jcr, M_ERROR, 0, _("Write error at %u:%u on device %s. ERR=%s.\n"),
549 dev->file, dev->block_num, dev->dev_name, strerror(dev->dev_errno));
551 dev->dev_errno = ENOSPC; /* out of space */
552 Jmsg(jcr, M_INFO, 0, _("End of medium at %u:%u on device %s. Write of %u bytes got %d.\n"),
553 dev->file, dev->block_num, dev->dev_name, wlen, stat);
556 Dmsg6(100, "=== Write error. size=%u rtn=%d dev_blk=%d blk_blk=%d errno=%d: ERR=%s\n",
557 wlen, stat, dev->block_num, block->BlockNumber, dev->dev_errno, strerror(dev->dev_errno));
559 block->write_failed = true;
560 if (weof_dev(dev, 1) != 0) { /* end the tape */
561 dev->VolCatInfo.VolCatErrors++;
562 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
564 Dmsg0(100, "dir_update_volume_info\n");
565 dev->VolCatInfo.VolCatFiles = dev->file;
566 dir_update_volume_info(jcr, dev, 0);
567 if (dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* end the tape */
568 dev->VolCatInfo.VolCatErrors++;
569 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
571 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
574 #define CHECK_LAST_BLOCK
575 #ifdef CHECK_LAST_BLOCK
577 * If the device is a tape and it supports backspace record,
578 * we backspace over one or two eof marks depending on
579 * how many we just wrote, then over the last record,
580 * then re-read it and verify that the block number is
583 if (dev->state & ST_TAPE && dev_cap(dev, CAP_BSR)) {
585 /* Now back up over what we wrote and read the last block */
586 if (!bsf_dev(dev, 1)) {
588 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
590 if (ok && dev_cap(dev, CAP_TWOEOF) && !bsf_dev(dev, 1)) {
592 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
594 /* Backspace over record */
595 if (ok && !bsr_dev(dev, 1)) {
597 Jmsg(jcr, M_ERROR, 0, _("Backspace record at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
599 * On FreeBSD systems, if the user got here, it is likely that his/her
600 * tape drive is "frozen". The correct thing to do is a
601 * rewind(), but if we do that, higher levels in cleaning up, will
602 * most likely write the EOS record over the beginning of the
603 * tape. The rewind *is* done later in mount.c when another
604 * tape is requested. Note, the clrerror_dev() call in bsr_dev()
605 * calls ioctl(MTCERRSTAT), which *should* fix the problem.
609 DEV_BLOCK *lblock = new_block(dev);
610 /* Note, this can destroy dev->errmsg */
611 if (!read_block_from_dev(jcr, dev, lblock, NO_BLOCK_NUMBER_CHECK)) {
612 Jmsg(jcr, M_ERROR, 0, _("Re-read last block at EOT failed. ERR=%s"), dev->errmsg);
614 if (lblock->BlockNumber+1 == block->BlockNumber) {
615 Jmsg(jcr, M_INFO, 0, _("Re-read of last block succeeded.\n"));
617 Jmsg(jcr, M_ERROR, 0, _(
618 "Re-read of last block failed. Last block=%u Current block=%u.\n"),
619 lblock->BlockNumber, block->BlockNumber);
629 /* We successfully wrote the block, now do housekeeping */
631 dev->VolCatInfo.VolCatBytes += block->binbuf;
632 dev->VolCatInfo.VolCatBlocks++;
633 dev->EndBlock = dev->block_num;
634 dev->EndFile = dev->file;
636 block->BlockNumber++;
638 /* Update jcr values */
639 if (dev_state(dev, ST_TAPE)) {
640 dcr->EndBlock = dev->EndBlock;
641 dcr->EndFile = dev->EndFile;
643 /* Save address of start of block just written */
644 dcr->EndBlock = (uint32_t)dev->file_addr;
645 dcr->EndFile = (uint32_t)(dev->file_addr >> 32);
647 if (dcr->VolFirstIndex == 0 && block->FirstIndex > 0) {
648 dcr->VolFirstIndex = block->FirstIndex;
650 if (block->LastIndex > 0) {
651 dcr->VolLastIndex = block->LastIndex;
653 dcr->WroteVol = true;
654 dev->file_addr += wlen; /* update file address */
655 dev->file_size += wlen;
657 Dmsg2(190, "write_block: wrote block %d bytes=%d\n", dev->block_num,
664 * Read block with locking
667 int read_block_from_device(JCR *jcr, DEVICE *dev, DEV_BLOCK *block, bool check_block_numbers)
670 Dmsg0(90, "Enter read_block_from_device\n");
672 stat = read_block_from_dev(jcr, dev, block, check_block_numbers);
674 Dmsg0(90, "Leave read_block_from_device\n");
679 * Read the next block into the block structure and unserialize
680 * the block header. For a file, the block may be partially
681 * or completely in the current buffer.
683 int read_block_from_dev(JCR *jcr, DEVICE *dev, DEV_BLOCK *block, bool check_block_numbers)
687 uint32_t BlockNumber;
692 Jmsg0(jcr, M_ABORT, 0, _("DCR is NULL!\n"));
694 if (dev_state(dev, ST_EOT)) {
698 Dmsg1(100, "Full read() in read_block_from_device() len=%d\n",
702 dev->dev_errno = EIO;
703 Mmsg1(&dev->errmsg, _("Block buffer size looping problem on device %s\n"),
705 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
711 stat = read(dev->fd, block->buf, (size_t)block->buf_len);
713 dev->VolCatInfo.VolCatErrors++;
715 } while (stat == -1 && (errno == EINTR || errno == EIO) && retry++ < 11);
716 // Dmsg1(100, "read stat = %d\n", stat);
718 Dmsg1(90, "Read device got: ERR=%s\n", strerror(errno));
719 clrerror_dev(dev, -1);
721 Mmsg4(&dev->errmsg, _("Read error at file:block %d:%d on device %s. ERR=%s.\n"),
722 dev->file, dev->block_num, dev->dev_name, strerror(dev->dev_errno));
723 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
724 if (dev->state & ST_EOF) { /* EOF just seen? */
725 dev->state |= ST_EOT; /* yes, error => EOT */
729 Dmsg1(90, "Read device got %d bytes\n", stat);
730 if (stat == 0) { /* Got EOF ! */
731 dev->block_num = block->read_len = 0;
732 Mmsg1(&dev->errmsg, _("Read zero bytes on device %s.\n"), dev->dev_name);
733 if (dev->state & ST_EOF) { /* EOF already read? */
734 dev->state |= ST_EOT; /* yes, 2 EOFs => EOT */
738 dev->file++; /* increment file */
739 dev->state |= ST_EOF; /* set EOF read */
741 return 0; /* return eof */
743 /* Continue here for successful read */
744 block->read_len = stat; /* save length read */
745 if (block->read_len < BLKHDR2_LENGTH) {
746 dev->dev_errno = EIO;
747 Mmsg2(&dev->errmsg, _("Volume data error! Very short block of %d bytes on device %s discarded.\n"),
748 block->read_len, dev->dev_name);
749 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
750 dev->state |= ST_SHORT; /* set short block */
751 block->read_len = block->binbuf = 0;
752 return 0; /* return error */
755 BlockNumber = block->BlockNumber + 1;
756 if (!unser_block_header(jcr, dev, block)) {
762 * If the block is bigger than the buffer, we reposition for
763 * re-reading the block, allocate a buffer of the correct size,
766 if (block->block_len > block->buf_len) {
767 dev->dev_errno = EIO;
768 Mmsg2(&dev->errmsg, _("Block length %u is greater than buffer %u. Attempting recovery.\n"),
769 block->block_len, block->buf_len);
770 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
771 Pmsg1(000, "%s", dev->errmsg);
772 /* Attempt to reposition to re-read the block */
773 if (dev->state & ST_TAPE) {
774 Dmsg0(100, "Backspace record for reread.\n");
775 if (!bsr_dev(dev, 1)) {
776 Jmsg(jcr, M_ERROR, 0, "%s", strerror_dev(dev));
781 Dmsg0(100, "Seek to beginning of block for reread.\n");
782 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
783 pos -= block->read_len;
784 lseek(dev->fd, pos, SEEK_SET);
785 dev->file_addr = pos;
787 Mmsg1(&dev->errmsg, _("Setting block buffer size to %u bytes.\n"), block->block_len);
788 Jmsg(jcr, M_INFO, 0, "%s", dev->errmsg);
789 Pmsg1(000, "%s", dev->errmsg);
790 /* Set new block length */
791 dev->max_block_size = block->block_len;
792 block->buf_len = block->block_len;
793 free_memory(block->buf);
794 block->buf = get_memory(block->buf_len);
797 goto reread; /* re-read block with correct block size */
800 if (block->block_len > block->read_len) {
801 dev->dev_errno = EIO;
802 Mmsg3(&dev->errmsg, _("Volume data error! Short block at %u of %d bytes on device %s discarded.\n"),
803 dev->block_num, block->read_len, dev->dev_name);
804 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
805 dev->state |= ST_SHORT; /* set short block */
806 block->read_len = block->binbuf = 0;
807 return 0; /* return error */
810 dev->state &= ~(ST_EOF|ST_SHORT); /* clear EOF and short block */
811 dev->VolCatInfo.VolCatReads++;
812 dev->VolCatInfo.VolCatRBytes += block->read_len;
814 dev->VolCatInfo.VolCatBytes += block->block_len;
815 dev->VolCatInfo.VolCatBlocks++;
816 dev->EndBlock = dev->block_num;
817 dev->EndFile = dev->file;
820 /* Update jcr values */
821 if (dev->state & ST_TAPE) {
822 dcr->EndBlock = dev->EndBlock;
823 dcr->EndFile = dev->EndFile;
825 dcr->EndBlock = (uint32_t)dev->file_addr;
826 dcr->EndFile = (uint32_t)(dev->file_addr >> 32);
827 dev->block_num = dcr->EndBlock;
828 dev->file = dcr->EndFile;
830 dev->file_addr += block->block_len;
831 dev->file_size += block->block_len;
834 * If we read a short block on disk,
835 * seek to beginning of next block. This saves us
836 * from shuffling blocks around in the buffer. Take a
837 * look at this from an efficiency stand point later, but
838 * it should only happen once at the end of each job.
840 * I've been lseek()ing negative relative to SEEK_CUR for 30
841 * years now. However, it seems that with the new off_t definition,
842 * it is not possible to seek negative amounts, so we use two
843 * lseek(). One to get the position, then the second to do an
844 * absolute positioning -- so much for efficiency. KES Sep 02.
846 Dmsg0(200, "At end of read block\n");
847 if (block->read_len > block->block_len && !(dev->state & ST_TAPE)) {
848 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
849 pos -= (block->read_len - block->block_len);
850 lseek(dev->fd, pos, SEEK_SET);
851 Dmsg2(100, "Did lseek blk_size=%d rdlen=%d\n", block->block_len,
853 dev->file_addr = pos;
855 Dmsg2(200, "Exit read_block read_len=%d block_len=%d\n",
856 block->read_len, block->block_len);
857 block->block_read = true;