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++;
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 Mmsg2(&dev->errmsg, _("Volume data error! Wanted ID: %s, got %s. Buffer discarded.\n"),
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 Mmsg1(&dev->errmsg, _("Volume data error! Wanted block-id BB02, got %s. Buffer discarded.\n"), Id);
263 if (block->read_errors == 0 || verbose >= 2) {
264 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
266 block->read_errors++;
271 if (block_len > MAX_BLOCK_LENGTH) {
272 dev->dev_errno = EIO;
273 Mmsg1(&dev->errmsg, _("Volume data error! Block length %u is insane (too large), probably due to a bad archive.\n"),
275 if (block->read_errors == 0 || verbose >= 2) {
276 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
278 block->read_errors++;
282 Dmsg1(190, "unser_block_header block_len=%d\n", block_len);
283 /* Find end of block or end of buffer whichever is smaller */
284 if (block_len > block->read_len) {
285 block_end = block->read_len;
287 block_end = block_len;
289 block->binbuf = block_end - bhl;
290 block->block_len = block_len;
291 block->BlockNumber = BlockNumber;
292 Dmsg3(190, "Read binbuf = %d %d block_len=%d\n", block->binbuf,
294 if (block_len <= block->read_len) {
295 BlockCheckSum = bcrc32((uint8_t *)block->buf+BLKHDR_CS_LENGTH,
296 block_len-BLKHDR_CS_LENGTH);
297 if (BlockCheckSum != CheckSum) {
298 dev->dev_errno = EIO;
299 Mmsg3(&dev->errmsg, _("Volume data error! Block checksum mismatch in block %u: calc=%x blk=%x\n"),
300 (unsigned)BlockNumber, BlockCheckSum, CheckSum);
301 if (block->read_errors == 0 || verbose >= 2) {
302 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
304 block->read_errors++;
312 * Write a block to the device, with locking and unlocking
314 * Returns: 1 on success
318 int write_block_to_device(DCR *dcr, DEV_BLOCK *block)
321 DEVICE *dev = dcr->dev;
326 stat = write_block_to_spool_file(dcr, block);
330 if (!dcr->dev_locked) {
335 * If a new volume has been mounted since our last write
336 * Create a JobMedia record for the previous volume written,
337 * and set new parameters to write this volume
338 * The same applies for if we are in a new file.
340 if (dcr->NewVol || dcr->NewFile) {
341 /* Create a jobmedia record for this job */
342 if (!dir_create_jobmedia_record(jcr)) {
343 dev->dev_errno = EIO;
344 Jmsg(jcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
345 jcr->VolCatInfo.VolCatName, jcr->Job);
346 set_new_volume_parameters(jcr, dev);
351 /* Note, setting a new volume also handles any pending new file */
352 set_new_volume_parameters(jcr, dev);
353 dcr->NewFile = false; /* this handled for new file too */
355 set_new_file_parameters(jcr, dev);
359 if (!write_block_to_dev(dcr, block)) {
360 stat = fixup_device_block_write_error(jcr, dev, block);
364 if (!dcr->dev_locked) {
371 * Write a block to the device
373 * Returns: 1 on success or EOT
376 int write_block_to_dev(DCR *dcr, DEV_BLOCK *block)
379 uint32_t wlen; /* length to write */
380 int hit_max1, hit_max2;
382 DEVICE *dev = dcr->dev;
385 #ifdef NO_TAPE_WRITE_TEST
389 ASSERT(block->binbuf == ((uint32_t) (block->bufp - block->buf)));
391 /* dump_block(block, "before write"); */
392 if (dev->state & ST_WEOT) {
393 Dmsg0(100, "return write_block_to_dev with ST_WEOT\n");
394 dev->dev_errno = ENOSPC;
395 Jmsg(jcr, M_FATAL, 0, _("Cannot write block. Device at EOM.\n"));
398 wlen = block->binbuf;
399 if (wlen <= WRITE_BLKHDR_LENGTH) { /* Does block have data in it? */
400 Dmsg0(100, "return write_block_to_dev no data to write\n");
404 * Clear to the end of the buffer if it is not full,
405 * and on tape devices, apply min and fixed blocking.
407 if (wlen != block->buf_len) {
408 uint32_t blen; /* current buffer length */
410 Dmsg2(200, "binbuf=%d buf_len=%d\n", block->binbuf, block->buf_len);
413 /* Adjust write size to min/max for tapes only */
414 if (dev->state & ST_TAPE) {
415 if (wlen < dev->min_block_size) {
416 wlen = ((dev->min_block_size + TAPE_BSIZE - 1) / TAPE_BSIZE) * TAPE_BSIZE;
418 /* check for fixed block size */
419 if (dev->min_block_size == dev->max_block_size) {
420 wlen = block->buf_len; /* fixed block size already rounded */
424 memset(block->bufp, 0, wlen-blen); /* clear garbage */
428 ser_block_header(block);
430 /* Limit maximum Volume size to value specified by user */
431 hit_max1 = (dev->max_volume_size > 0) &&
432 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->max_volume_size;
433 hit_max2 = (dev->VolCatInfo.VolCatMaxBytes > 0) &&
434 ((dev->VolCatInfo.VolCatBytes + block->binbuf)) >= dev->VolCatInfo.VolCatMaxBytes;
435 if (hit_max1 || hit_max2) {
438 Dmsg0(10, "==== Output bytes Triggered medium max capacity.\n");
440 max_cap = dev->max_volume_size;
442 max_cap = dev->VolCatInfo.VolCatMaxBytes;
444 Jmsg(jcr, M_INFO, 0, _("User defined maximum volume capacity %s exceeded on device %s.\n"),
445 edit_uint64_with_commas(max_cap, ed1), dev->dev_name);
446 block->write_failed = true;
447 if (weof_dev(dev, 1) != 0) { /* end tape */
448 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
449 dev->VolCatInfo.VolCatErrors++;
451 /* Don't do update after second EOF or file count will be wrong */
452 Dmsg0(100, "dir_update_volume_info\n");
453 dev->VolCatInfo.VolCatFiles = dev->file;
454 dir_update_volume_info(jcr, dev, 0);
455 if (dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* write eof */
456 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
457 dev->VolCatInfo.VolCatErrors++;
459 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
460 dev->dev_errno = ENOSPC;
464 /* Limit maximum File size on volume to user specified value */
465 if ((dev->max_file_size > 0) &&
466 (dev->file_size+block->binbuf) >= dev->max_file_size) {
468 if (dev_state(dev, ST_TAPE) && weof_dev(dev, 1) != 0) { /* write eof */
470 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
471 block->write_failed = true;
472 dev->VolCatInfo.VolCatErrors++;
473 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
474 Dmsg0(100, "dir_update_volume_info\n");
475 dev->VolCatInfo.VolCatFiles = dev->file;
476 dir_update_volume_info(jcr, dev, 0);
477 dev->dev_errno = ENOSPC;
481 /* Create a JobMedia record so restore can seek */
482 Dmsg0(100, "dir_update_volume_info\n");
483 dev->VolCatInfo.VolCatFiles = dev->file;
484 dir_update_volume_info(jcr, dev, 0);
485 if (!dir_create_jobmedia_record(jcr)) {
486 dev->dev_errno = EIO;
487 Jmsg(jcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
488 dcr->VolCatInfo.VolCatName, jcr->Job);
491 dev->file_size = 0; /* reset file size */
493 * Walk through all attached jcrs indicating the file has changed
495 Dmsg1(100, "Walk attached jcrs. Volume=%s\n", dev->VolCatInfo.VolCatName);
496 for (JCR *mjcr=NULL; (mjcr=next_attached_jcr(dev, mjcr)); ) {
497 if (mjcr->JobId == 0) {
498 continue; /* ignore console */
500 mjcr->dcr->NewFile = true; /* set reminder to do set_new_file_params */
502 set_new_file_parameters(jcr, dev);
505 dev->VolCatInfo.VolCatWrites++;
506 Dmsg1(300, "Write block of %u bytes\n", wlen);
507 stat = write(dev->fd, block->buf, (size_t)wlen);
508 if (stat != (ssize_t)wlen) {
509 /* We should check for errno == ENOSPC, BUT many
510 * devices simply report EIO when the volume is full.
511 * With a little more thought we may be able to check
512 * capacity and distinguish real errors and EOT
513 * conditions. In any case, we probably want to
514 * simulate an End of Medium.
517 /* I have added the ifdefing here because it appears on
518 * FreeBSD where MTIOCERRSTAT is defined, this not only
519 * clears the error but clears the residual unwritten
520 * buffers -> data loss. As a consequence, on those
521 * systems (FreeBSD like), do the clrerror() only after
522 * the weof_dev() call.
524 clrerror_dev(dev, -1);
525 if (dev->dev_errno == 0) {
526 dev->dev_errno = ENOSPC; /* out of space */
528 Jmsg(jcr, M_ERROR, 0, _("Write error at %u:%u on device %s. ERR=%s.\n"),
529 dev->file, dev->block_num, dev->dev_name, strerror(dev->dev_errno));
531 dev->dev_errno = ENOSPC; /* out of space */
532 Jmsg(jcr, M_INFO, 0, _("End of medium at %u:%u on device %s. Write of %u bytes got %d.\n"),
533 dev->file, dev->block_num, dev->dev_name, wlen, stat);
536 Dmsg6(100, "=== Write error. size=%u rtn=%d dev_blk=%d blk_blk=%d errno=%d: ERR=%s\n",
537 wlen, stat, dev->block_num, block->BlockNumber, dev->dev_errno, strerror(dev->dev_errno));
539 block->write_failed = true;
540 if (weof_dev(dev, 1) != 0) { /* end the tape */
541 dev->VolCatInfo.VolCatErrors++;
542 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
544 Dmsg0(100, "dir_update_volume_info\n");
545 dev->VolCatInfo.VolCatFiles = dev->file;
546 dir_update_volume_info(jcr, dev, 0);
547 if (dev_cap(dev, CAP_TWOEOF) && weof_dev(dev, 1) != 0) { /* end the tape */
548 dev->VolCatInfo.VolCatErrors++;
549 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
551 dev->state |= (ST_EOF | ST_EOT | ST_WEOT);
554 #define CHECK_LAST_BLOCK
555 #ifdef CHECK_LAST_BLOCK
557 * If the device is a tape and it supports backspace record,
558 * we backspace over one or two eof marks depending on
559 * how many we just wrote, then over the last record,
560 * then re-read it and verify that the block number is
563 if (dev->state & ST_TAPE && dev_cap(dev, CAP_BSR)) {
565 /* Now back up over what we wrote and read the last block */
566 if (!bsf_dev(dev, 1)) {
568 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
570 if (ok && dev_cap(dev, CAP_TWOEOF) && !bsf_dev(dev, 1)) {
572 Jmsg(jcr, M_ERROR, 0, _("Backspace file at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
574 /* Backspace over record */
575 if (ok && !bsr_dev(dev, 1)) {
577 Jmsg(jcr, M_ERROR, 0, _("Backspace record at EOT failed. ERR=%s\n"), strerror(dev->dev_errno));
579 * On FreeBSD systems, if the user got here, it is likely that his/her
580 * tape drive is "frozen". The correct thing to do is a
581 * rewind(), but if we do that, higher levels in cleaning up, will
582 * most likely write the EOS record over the beginning of the
583 * tape. The rewind *is* done later in mount.c when another
584 * tape is requested. Note, the clrerror_dev() call in bsr_dev()
585 * calls ioctl(MTCERRSTAT), which *should* fix the problem.
589 DEV_BLOCK *lblock = new_block(dev);
590 /* Note, this can destroy dev->errmsg */
591 if (!read_block_from_dev(jcr, dev, lblock, NO_BLOCK_NUMBER_CHECK)) {
592 Jmsg(jcr, M_ERROR, 0, _("Re-read last block at EOT failed. ERR=%s"), dev->errmsg);
594 if (lblock->BlockNumber+1 == block->BlockNumber) {
595 Jmsg(jcr, M_INFO, 0, _("Re-read of last block succeeded.\n"));
597 Jmsg(jcr, M_ERROR, 0, _(
598 "Re-read of last block failed. Last block=%u Current block=%u.\n"),
599 lblock->BlockNumber, block->BlockNumber);
609 /* We successfully wrote the block, now do housekeeping */
611 dev->VolCatInfo.VolCatBytes += block->binbuf;
612 dev->VolCatInfo.VolCatBlocks++;
613 dev->EndBlock = dev->block_num;
614 dev->EndFile = dev->file;
616 block->BlockNumber++;
618 /* Update jcr values */
619 if (dev_state(dev, ST_TAPE)) {
620 dcr->EndBlock = dev->EndBlock;
621 dcr->EndFile = dev->EndFile;
623 /* Save address of start of block just written */
624 dcr->EndBlock = (uint32_t)dev->file_addr;
625 dcr->EndFile = (uint32_t)(dev->file_addr >> 32);
627 if (dcr->VolFirstIndex == 0 && block->FirstIndex > 0) {
628 dcr->VolFirstIndex = block->FirstIndex;
630 if (block->LastIndex > 0) {
631 dcr->VolLastIndex = block->LastIndex;
633 dcr->WroteVol = true;
634 dev->file_addr += wlen; /* update file address */
635 dev->file_size += wlen;
637 Dmsg2(190, "write_block: wrote block %d bytes=%d\n", dev->block_num,
644 * Read block with locking
647 int read_block_from_device(JCR *jcr, DEVICE *dev, DEV_BLOCK *block, bool check_block_numbers)
650 Dmsg0(90, "Enter read_block_from_device\n");
652 stat = read_block_from_dev(jcr, dev, block, check_block_numbers);
654 Dmsg0(90, "Leave read_block_from_device\n");
659 * Read the next block into the block structure and unserialize
660 * the block header. For a file, the block may be partially
661 * or completely in the current buffer.
663 int read_block_from_dev(JCR *jcr, DEVICE *dev, DEV_BLOCK *block, bool check_block_numbers)
667 uint32_t BlockNumber;
671 if (dev_state(dev, ST_EOT)) {
675 Dmsg1(100, "Full read() in read_block_from_device() len=%d\n",
679 dev->dev_errno = EIO;
680 Mmsg1(&dev->errmsg, _("Block buffer size looping problem on device %s\n"),
682 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
688 stat = read(dev->fd, block->buf, (size_t)block->buf_len);
690 dev->VolCatInfo.VolCatErrors++;
692 } while (stat == -1 && (errno == EINTR || errno == EIO) && retry++ < 11);
693 // Dmsg1(100, "read stat = %d\n", stat);
695 Dmsg1(90, "Read device got: ERR=%s\n", strerror(errno));
696 clrerror_dev(dev, -1);
698 Mmsg4(&dev->errmsg, _("Read error at file:block %d:%d on device %s. ERR=%s.\n"),
699 dev->file, dev->block_num, dev->dev_name, strerror(dev->dev_errno));
700 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
701 if (dev->state & ST_EOF) { /* EOF just seen? */
702 dev->state |= ST_EOT; /* yes, error => EOT */
706 Dmsg1(90, "Read device got %d bytes\n", stat);
707 if (stat == 0) { /* Got EOF ! */
708 dev->block_num = block->read_len = 0;
709 Mmsg1(&dev->errmsg, _("Read zero bytes on device %s.\n"), dev->dev_name);
710 if (dev->state & ST_EOF) { /* EOF already read? */
711 dev->state |= ST_EOT; /* yes, 2 EOFs => EOT */
715 dev->file++; /* increment file */
716 dev->state |= ST_EOF; /* set EOF read */
718 return 0; /* return eof */
720 /* Continue here for successful read */
721 block->read_len = stat; /* save length read */
722 if (block->read_len < BLKHDR2_LENGTH) {
723 dev->dev_errno = EIO;
724 Mmsg2(&dev->errmsg, _("Volume data error! Very short block of %d bytes on device %s discarded.\n"),
725 block->read_len, dev->dev_name);
726 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
727 dev->state |= ST_SHORT; /* set short block */
728 block->read_len = block->binbuf = 0;
729 return 0; /* return error */
732 BlockNumber = block->BlockNumber + 1;
733 if (!unser_block_header(jcr, dev, block)) {
739 * If the block is bigger than the buffer, we reposition for
740 * re-reading the block, allocate a buffer of the correct size,
743 if (block->block_len > block->buf_len) {
744 dev->dev_errno = EIO;
745 Mmsg2(&dev->errmsg, _("Block length %u is greater than buffer %u. Attempting recovery.\n"),
746 block->block_len, block->buf_len);
747 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
748 Pmsg1(000, "%s", dev->errmsg);
749 /* Attempt to reposition to re-read the block */
750 if (dev->state & ST_TAPE) {
751 Dmsg0(100, "Backspace record for reread.\n");
752 if (!bsr_dev(dev, 1)) {
753 Jmsg(jcr, M_ERROR, 0, "%s", strerror_dev(dev));
758 Dmsg0(100, "Seek to beginning of block for reread.\n");
759 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
760 pos -= block->read_len;
761 lseek(dev->fd, pos, SEEK_SET);
762 dev->file_addr = pos;
764 Mmsg1(&dev->errmsg, _("Setting block buffer size to %u bytes.\n"), block->block_len);
765 Jmsg(jcr, M_INFO, 0, "%s", dev->errmsg);
766 Pmsg1(000, "%s", dev->errmsg);
767 /* Set new block length */
768 dev->max_block_size = block->block_len;
769 block->buf_len = block->block_len;
770 free_memory(block->buf);
771 block->buf = get_memory(block->buf_len);
774 goto reread; /* re-read block with correct block size */
777 if (block->block_len > block->read_len) {
778 dev->dev_errno = EIO;
779 Mmsg3(&dev->errmsg, _("Volume data error! Short block at %u of %d bytes on device %s discarded.\n"),
780 dev->block_num, block->read_len, dev->dev_name);
781 Jmsg(jcr, M_ERROR, 0, "%s", dev->errmsg);
782 dev->state |= ST_SHORT; /* set short block */
783 block->read_len = block->binbuf = 0;
784 return 0; /* return error */
787 dev->state &= ~(ST_EOF|ST_SHORT); /* clear EOF and short block */
788 dev->VolCatInfo.VolCatReads++;
789 dev->VolCatInfo.VolCatRBytes += block->read_len;
791 dev->VolCatInfo.VolCatBytes += block->block_len;
792 dev->VolCatInfo.VolCatBlocks++;
793 dev->EndBlock = dev->block_num;
794 dev->EndFile = dev->file;
797 /* Update jcr values */
798 if (dev->state & ST_TAPE) {
799 dcr->EndBlock = dev->EndBlock;
800 dcr->EndFile = dev->EndFile;
802 dcr->EndBlock = (uint32_t)dev->file_addr;
803 dcr->EndFile = (uint32_t)(dev->file_addr >> 32);
804 dev->block_num = dcr->EndBlock;
805 dev->file = dcr->EndFile;
807 dev->file_addr += block->block_len;
808 dev->file_size += block->block_len;
811 * If we read a short block on disk,
812 * seek to beginning of next block. This saves us
813 * from shuffling blocks around in the buffer. Take a
814 * look at this from an efficiency stand point later, but
815 * it should only happen once at the end of each job.
817 * I've been lseek()ing negative relative to SEEK_CUR for 30
818 * years now. However, it seems that with the new off_t definition,
819 * it is not possible to seek negative amounts, so we use two
820 * lseek(). One to get the position, then the second to do an
821 * absolute positioning -- so much for efficiency. KES Sep 02.
823 Dmsg0(200, "At end of read block\n");
824 if (block->read_len > block->block_len && !(dev->state & ST_TAPE)) {
825 off_t pos = lseek(dev->fd, (off_t)0, SEEK_CUR); /* get curr pos */
826 pos -= (block->read_len - block->block_len);
827 lseek(dev->fd, pos, SEEK_SET);
828 Dmsg2(100, "Did lseek blk_size=%d rdlen=%d\n", block->block_len,
830 dev->file_addr = pos;
832 Dmsg2(200, "Exit read_block read_len=%d block_len=%d\n",
833 block->read_len, block->block_len);
834 block->block_read = true;