2 Bacula® - The Network Backup Solution
4 Copyright (C) 2002-2009 Free Software Foundation Europe e.V.
6 The main author of Bacula is Kern Sibbald, with contributions from
7 many others, a complete list can be found in the file AUTHORS.
8 This program is Free Software; you can redistribute it and/or
9 modify it under the terms of version two of the GNU General Public
10 License as published by the Free Software Foundation and included
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 Bacula® is a registered trademark of Kern Sibbald.
24 The licensor of Bacula is the Free Software Foundation Europe
25 (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
26 Switzerland, email:ftf@fsfeurope.org.
30 * Routines for handling mounting tapes for reading and for
33 * Kern Sibbald, August MMII
38 #include "bacula.h" /* pull in global headers */
39 #include "stored.h" /* pull in Storage Deamon headers */
57 * If release is set, we rewind the current volume,
58 * which we no longer want, and ask the user (console)
59 * to mount the next volume.
61 * Continue trying until we get it, and then ensure
62 * that we can write on it.
64 * This routine returns a 0 only if it is REALLY
65 * impossible to get the requested Volume.
68 bool DCR::mount_next_write_volume()
71 bool ask = false, recycle, autochanger;
76 Dmsg2(150, "Enter mount_next_volume(release=%d) dev=%s\n", dev->must_unload(),
79 init_device_wait_timers(dcr);
83 * Attempt to mount the next volume. If something non-fatal goes
84 * wrong, we come back here to re-try (new op messages, re-read
88 Dmsg1(150, "mount_next_vol retry=%d\n", retry);
89 /* Ignore retry if this is poll request */
90 if (!dev->poll && retry++ > 4) {
91 /* Last ditch effort before giving up, force operator to respond */
94 if (!dir_ask_sysop_to_mount_volume(dcr, ST_APPEND)) {
95 Jmsg(jcr, M_FATAL, 0, _("Too many errors trying to mount device %s.\n"),
97 goto no_lock_bail_out;
100 Dmsg1(150, "Continue after dir_ask_sysop_to_mount. must_load=%d\n", dev->must_load());
102 if (job_canceled(jcr)) {
103 Jmsg(jcr, M_FATAL, 0, _("Job %d canceled.\n"), jcr->JobId);
112 if (dev->must_unload()) {
113 ask = true; /* ask operator to mount tape */
114 do_find = true; /* re-find a volume after unload */
117 do_swapping(true /*is_writing*/);
118 do_load(true /*is_writing*/);
120 if (do_find && !find_a_volume()) {
121 goto no_lock_bail_out;
124 if (job_canceled(jcr)) {
127 Dmsg3(150, "After find_next_append. Vol=%s Slot=%d Parts=%d\n",
128 VolCatInfo.VolCatName, VolCatInfo.Slot, VolCatInfo.VolCatParts);
131 * Get next volume and ready it for append
132 * This code ensures that the device is ready for
133 * writing. We start from the assumption that there
134 * may not be a tape mounted.
136 * If the device is a file, we create the output
137 * file. If it is a tape, we check the volume name
138 * and move the tape to the end of data.
141 if (autoload_device(dcr, true/*writing*/, NULL) > 0) {
148 do_find = true; /* do find_a_volume if we retry */
150 Dmsg1(150, "autoload_dev returns %d\n", autochanger);
152 * If we autochanged to correct Volume or (we have not just
153 * released the Volume AND we can automount) we go ahead
154 * and read the label. If there is no tape in the drive,
155 * we will fail, recurse and ask the operator the next time.
157 if (!dev->must_unload() && dev->is_tape() && dev->has_cap(CAP_AUTOMOUNT)) {
158 Dmsg0(250, "(1)Ask=0\n");
159 ask = false; /* don't ask SYSOP this time */
161 /* Don't ask if not removable */
162 if (!dev->is_removable()) {
163 Dmsg0(250, "(2)Ask=0\n");
166 Dmsg2(250, "Ask=%d autochanger=%d\n", ask, autochanger);
170 if (!dir_ask_sysop_to_mount_volume(dcr, ST_APPEND)) {
171 Dmsg0(150, "Error return ask_sysop ...\n");
172 goto no_lock_bail_out;
176 if (job_canceled(jcr)) {
179 Dmsg3(150, "want vol=%s devvol=%s dev=%s\n", VolumeName,
180 dev->VolHdr.VolumeName, dev->print_name());
182 if (dev->poll && dev->has_cap(CAP_CLOSEONPOLL)) {
187 /* Ensure the device is open */
188 if (dev->has_cap(CAP_STREAM)) {
189 mode = OPEN_WRITE_ONLY;
191 mode = OPEN_READ_WRITE;
193 /* Try autolabel if enabled */
194 if (dev->open(dcr, mode) < 0) {
195 try_autolabel(false); /* try to create a new volume label */
197 while (dev->open(dcr, mode) < 0) {
198 Dmsg1(150, "open_device failed: ERR=%s\n", dev->bstrerror());
199 if ((dev->is_file() && dev->is_removable()) || dev->is_dvd()) {
201 Dmsg0(150, "call scan_dir_for_vol\n");
203 if (!dev->mount(0)) {
207 if (ok && dev->scan_dir_for_volume(dcr)) {
208 if (dev->open(dcr, mode) >= 0) {
209 break; /* got a valid volume */
212 if (ok && dev->is_dvd()) {
216 if (try_autolabel(false) == try_read_vol) {
217 break; /* created a new volume label */
219 Jmsg3(jcr, M_WARNING, 0, _("Open device %s Volume \"%s\" failed: ERR=%s\n"),
220 dev->print_name(), dcr->VolumeName, dev->bstrerror());
221 Dmsg0(50, "set_unload\n");
222 dev->set_unload(); /* force ask sysop */
224 Dmsg0(150, "goto mount_next_vol\n");
229 * Now check the volume label to make sure we have the right tape mounted
232 switch (check_volume_label(ask, autochanger)) {
234 Dmsg0(50, "set_unload\n");
235 dev->set_unload(); /* want a different Volume */
236 Dmsg0(150, "goto mount_next_vol\n");
247 * See if we have a fresh tape or a tape with data.
249 * Note, if the LabelType is PRE_LABEL, it was labeled
250 * but never written. If so, rewrite the label but set as
251 * VOL_LABEL. We rewind and return the label (reconstructed)
252 * in the block so that in the case of a new tape, data can
253 * be appended just after the block label. If we are writing
254 * a second volume, the calling routine will write the label
255 * before writing the overflow block.
257 * If the tape is marked as Recycle, we rewrite the label.
259 recycle = strcmp(dev->VolCatInfo.VolCatStatus, "Recycle") == 0;
260 if (dev->VolHdr.LabelType == PRE_LABEL || recycle) {
261 if (!rewrite_volume_label(dcr, recycle)) {
262 mark_volume_in_error();
267 * OK, at this point, we have a valid Bacula label, but
268 * we need to position to the end of the volume, since we are
269 * just now putting it into append mode.
271 Dmsg0(200, "Device previously written, moving to end of data\n");
272 Jmsg(jcr, M_INFO, 0, _("Volume \"%s\" previously written, moving to end of data.\n"),
275 if (!dev->eod(dcr)) {
276 Jmsg(jcr, M_ERROR, 0, _("Unable to position to end of data on device %s: ERR=%s\n"),
277 dev->print_name(), dev->bstrerror());
278 mark_volume_in_error();
281 if (!is_eod_valid()) {
282 Dmsg0(150, "goto mount_next_vol\n");
286 dev->VolCatInfo.VolCatMounts++; /* Update mounts */
287 Dmsg1(150, "update volinfo mounts=%d\n", dev->VolCatInfo.VolCatMounts);
288 if (!dir_update_volume_info(dcr, false, false)) {
292 /* Return an empty block */
293 empty_block(block); /* we used it for reading so set for write */
296 Dmsg1(150, "set APPEND, normal return from mount_next_write_volume. dev=%s\n",
310 * This routine is meant to be called once the first pass
311 * to ensure that we have a candidate volume to mount.
312 * Otherwise, we ask the sysop to created one.
313 * Note, the the Volumes are locked on entry.
314 * They are unlocked on failure and remain locked on
315 * success. The caller must know this!!!
317 bool DCR::find_a_volume()
320 if (!is_suitable_volume_mounted()) {
321 bool have_vol = false;
322 /* Do we have a candidate volume? */
324 bstrncpy(VolumeName, dev->vol->vol_name, sizeof(VolumeName));
325 have_vol = dir_get_volume_info(this, GET_VOL_INFO_FOR_WRITE);
328 * Get Director's idea of what tape we should have mounted.
332 Dmsg0(200, "Before dir_find_next_appendable_volume.\n");
333 while (!dir_find_next_appendable_volume(dcr)) {
334 Dmsg0(200, "not dir_find_next\n");
335 if (job_canceled(jcr)) {
340 if (!dir_ask_sysop_to_create_appendable_volume(dcr)) {
344 Dmsg0(150, "Again dir_find_next_append...\n");
351 int DCR::check_volume_label(bool &ask, bool &autochanger)
353 int vol_label_status;
355 * If we are writing to a stream device, ASSUME the volume label
358 if (dev->has_cap(CAP_STREAM)) {
359 vol_label_status = VOL_OK;
360 create_volume_label(dev, VolumeName, "Default", false /* not DVD */);
361 dev->VolHdr.LabelType = PRE_LABEL;
363 vol_label_status = read_dev_volume_label(this);
365 if (job_canceled(jcr)) {
369 Dmsg2(150, "Want dirVol=%s dirStat=%s\n", VolumeName,
370 VolCatInfo.VolCatStatus);
372 * At this point, dev->VolCatInfo has what is in the drive, if anything,
373 * and dcr->VolCatInfo has what the Director wants.
375 switch (vol_label_status) {
377 Dmsg1(150, "Vol OK name=%s\n", dev->VolHdr.VolumeName);
378 dev->VolCatInfo = VolCatInfo; /* structure assignment */
379 break; /* got a Volume */
381 VOLUME_CAT_INFO dcrVolCatInfo, devVolCatInfo;
382 char saveVolumeName[MAX_NAME_LENGTH];
384 Dmsg2(150, "Vol NAME Error Have=%s, want=%s\n", dev->VolHdr.VolumeName, VolumeName);
385 if (dev->is_volume_to_unload()) {
387 goto check_next_volume;
390 /* If not removable, Volume is broken */
391 if (!dev->is_removable()) {
392 Jmsg(jcr, M_WARNING, 0, _("Volume \"%s\" not on device %s.\n"),
393 VolumeName, dev->print_name());
394 mark_volume_in_error();
395 goto check_next_volume;
399 * OK, we got a different volume mounted. First save the
400 * requested Volume info (dcr) structure, then query if
401 * this volume is really OK. If not, put back the desired
402 * volume name, mark it not in changer and continue.
404 dcrVolCatInfo = VolCatInfo; /* structure assignment */
405 devVolCatInfo = dev->VolCatInfo; /* structure assignment */
406 /* Check if this is a valid Volume in the pool */
407 bstrncpy(saveVolumeName, VolumeName, sizeof(saveVolumeName));
408 bstrncpy(VolumeName, dev->VolHdr.VolumeName, sizeof(VolumeName));
409 if (!dir_get_volume_info(this, GET_VOL_INFO_FOR_WRITE)) {
410 POOL_MEM vol_info_msg;
411 pm_strcpy(vol_info_msg, jcr->dir_bsock->msg); /* save error message */
412 /* Restore desired volume name, note device info out of sync */
413 /* This gets the info regardless of the Pool */
414 bstrncpy(VolumeName, dev->VolHdr.VolumeName, sizeof(VolumeName));
415 if (autochanger && !dir_get_volume_info(this, GET_VOL_INFO_FOR_READ)) {
417 * If we get here, we know we cannot write on the Volume,
418 * and we know that we cannot read it either, so it
419 * is not in the autochanger.
421 mark_volume_not_inchanger();
423 dev->VolCatInfo = devVolCatInfo; /* structure assignment */
424 dev->set_unload(); /* unload this volume */
425 Jmsg(jcr, M_WARNING, 0, _("Director wanted Volume \"%s\".\n"
426 " Current Volume \"%s\" not acceptable because:\n"
428 dcrVolCatInfo.VolCatName, dev->VolHdr.VolumeName,
429 vol_info_msg.c_str());
431 /* Restore saved DCR before continuing */
432 bstrncpy(VolumeName, saveVolumeName, sizeof(VolumeName));
433 VolCatInfo = dcrVolCatInfo; /* structure assignment */
434 goto check_next_volume;
437 * This was not the volume we expected, but it is OK with
438 * the Director, so use it.
440 Dmsg1(150, "Got new Volume name=%s\n", VolumeName);
441 dev->VolCatInfo = VolCatInfo; /* structure assignment */
442 Dmsg1(100, "Call reserve_volume=%s\n", dev->VolHdr.VolumeName);
443 if (reserve_volume(this, dev->VolHdr.VolumeName) == NULL) {
444 Jmsg2(jcr, M_WARNING, 0, _("Could not reserve volume %s on %s\n"),
445 dev->VolHdr.VolumeName, dev->print_name());
447 goto check_next_volume;
449 break; /* got a Volume */
451 * At this point, we assume we have a blank tape mounted.
455 Jmsg(jcr, M_FATAL, 0, "%s", jcr->errmsg);
456 mark_volume_in_error();
457 goto check_bail_out; /* we could not write on DVD */
459 /* Fall through wanted */
461 switch (try_autolabel(true)) {
463 goto check_next_volume;
465 goto check_read_volume;
471 /* NOTE! Fall-through wanted. */
474 Dmsg0(200, "VOL_NO_MEDIA or default.\n");
475 /* Send error message */
478 Dmsg1(200, "Msg suppressed by poll: %s\n", jcr->errmsg);
481 /* Needed, so the medium can be changed */
482 if (dev->requires_mount()) {
486 goto check_next_volume;
491 return check_next_vol;
497 return check_read_vol;
502 bool DCR::is_suitable_volume_mounted()
504 /* Volume mounted? */
505 if (dev->VolHdr.VolumeName[0] == 0 || dev->swap_dev || dev->must_unload()) {
506 return false; /* no */
508 bstrncpy(VolumeName, dev->VolHdr.VolumeName, sizeof(VolumeName));
509 return dir_get_volume_info(this, GET_VOL_INFO_FOR_WRITE);
512 bool DCR::do_unload()
514 if (dev->must_unload()) {
515 Dmsg1(100, "must_unload release %s\n", dev->print_name());
521 bool DCR::do_load(bool is_writing)
523 if (dev->must_load()) {
524 Dmsg1(100, "Must load %s\n", dev->print_name());
525 if (autoload_device(this, is_writing, NULL) > 0) {
534 void DCR::do_swapping(bool is_writing)
537 * See if we are asked to swap the Volume from another device
538 * if so, unload the other device here, and attach the
539 * volume to our drive.
542 if (dev->swap_dev->must_unload()) {
544 dev->swap_dev->set_slot(dev->vol->get_slot());
546 Dmsg2(100, "Swap unloading slot=%d %s\n", dev->swap_dev->get_slot(),
547 dev->swap_dev->print_name());
548 unload_dev(this, dev->swap_dev);
551 dev->vol->clear_swapping();
552 Dmsg1(100, "=== set in_use vol=%s\n", dev->vol->vol_name);
553 dev->vol->set_in_use();
554 dev->VolHdr.VolumeName[0] = 0; /* don't yet have right Volume */
556 Dmsg1(100, "No vol on dev=%s\n", dev->print_name());
558 if (dev->swap_dev->vol) {
559 Dmsg2(100, "Vol=%s on dev=%s\n", dev->swap_dev->vol->vol_name,
560 dev->swap_dev->print_name());
562 dev->swap_dev = NULL;
568 * Check if the current position on the volume corresponds to
569 * what is in the catalog.
571 bool DCR::is_eod_valid()
574 char ed1[50], ed2[50];
575 if (dev->VolCatInfo.VolCatBytes == dev->part_start + dev->part_size) {
576 Jmsg(jcr, M_INFO, 0, _("Ready to append to end of Volume \"%s\""
577 " part=%d size=%s\n"), VolumeName,
578 dev->part, edit_uint64(dev->VolCatInfo.VolCatBytes,ed1));
580 Jmsg(jcr, M_ERROR, 0, _("Bacula cannot write on DVD Volume \"%s\" because: "
581 "The sizes do not match! Volume=%s Catalog=%s\n"),
583 edit_uint64(dev->part_start + dev->part_size, ed1),
584 edit_uint64(dev->VolCatInfo.VolCatBytes, ed2));
585 mark_volume_in_error();
588 } else if (dev->is_tape()) {
590 * Check if we are positioned on the tape at the same place
591 * that the database says we should be.
593 if (dev->VolCatInfo.VolCatFiles == dev->get_file()) {
594 Jmsg(jcr, M_INFO, 0, _("Ready to append to end of Volume \"%s\" at file=%d.\n"),
595 VolumeName, dev->get_file());
597 Jmsg(jcr, M_ERROR, 0, _("Bacula cannot write on tape Volume \"%s\" because:\n"
598 "The number of files mismatch! Volume=%u Catalog=%u\n"),
599 VolumeName, dev->get_file(), dev->VolCatInfo.VolCatFiles);
600 mark_volume_in_error();
603 } else if (dev->is_file()) {
604 char ed1[50], ed2[50];
606 pos = dev->lseek(this, (boffset_t)0, SEEK_END);
607 if (dev->VolCatInfo.VolCatBytes == (uint64_t)pos) {
608 Jmsg(jcr, M_INFO, 0, _("Ready to append to end of Volume \"%s\""
609 " size=%s\n"), VolumeName,
610 edit_uint64(dev->VolCatInfo.VolCatBytes, ed1));
612 Jmsg(jcr, M_ERROR, 0, _("Bacula cannot write on disk Volume \"%s\" because: "
613 "The sizes do not match! Volume=%s Catalog=%s\n"),
615 edit_uint64(pos, ed1),
616 edit_uint64(dev->VolCatInfo.VolCatBytes, ed2));
617 mark_volume_in_error();
626 * If permitted, we label the device, make sure we can do
627 * it by checking that the VolCatBytes is zero => not labeled,
628 * once the Volume is labeled we don't want to label another
629 * blank tape with the same name. For disk, we go ahead and
630 * label it anyway, because the OS insures that there is only
631 * one Volume with that name.
632 * As noted above, at this point dcr->VolCatInfo has what
633 * the Director wants and dev->VolCatInfo has info on the
634 * previous tape (or nothing).
637 * try_next_vol label failed, look for another volume
638 * try_read_vol labeled volume, now re-read the label
639 * try_error hard error (catalog update)
640 * try_default I couldn't do anything
642 int DCR::try_autolabel(bool opened)
646 if (dev->poll && !dev->is_tape()) {
647 return try_default; /* if polling, don't try to create new labels */
649 /* For a tape require it to be opened and read before labeling */
650 if (!opened && dev->is_tape()) {
653 if (dev->has_cap(CAP_LABEL) && (VolCatInfo.VolCatBytes == 0 ||
654 (!dev->is_tape() && strcmp(VolCatInfo.VolCatStatus,
656 Dmsg0(150, "Create volume label\n");
657 /* Create a new Volume label and write it to the device */
658 if (!write_new_volume_label_to_dev(dcr, VolumeName,
659 pool_name, false, /* no relabel */ false /* defer DVD label */)) {
660 Dmsg2(150, "write_vol_label failed. vol=%s, pool=%s\n",
661 VolumeName, pool_name);
663 mark_volume_in_error();
667 Dmsg0(150, "dir_update_vol_info. Set Append\n");
668 /* Copy Director's info into the device info */
669 dev->VolCatInfo = VolCatInfo; /* structure assignment */
670 if (!dir_update_volume_info(dcr, true, true)) { /* indicate tape labeled */
673 Jmsg(dcr->jcr, M_INFO, 0, _("Labeled new Volume \"%s\" on device %s.\n"),
674 VolumeName, dev->print_name());
675 return try_read_vol; /* read label we just wrote */
677 if (!dev->has_cap(CAP_LABEL) && VolCatInfo.VolCatBytes == 0) {
678 Jmsg(jcr, M_WARNING, 0, _("Device %s not configured to autolabel Volumes.\n"),
681 /* If not removable, Volume is broken */
682 if (!dev->is_removable()) {
683 Jmsg(jcr, M_WARNING, 0, _("Volume \"%s\" not on device %s.\n"),
684 VolumeName, dev->print_name());
685 mark_volume_in_error();
693 * Mark volume in error in catalog
695 void DCR::mark_volume_in_error()
697 Jmsg(jcr, M_INFO, 0, _("Marking Volume \"%s\" in Error in Catalog.\n"),
699 dev->VolCatInfo = VolCatInfo; /* structure assignment */
700 bstrncpy(dev->VolCatInfo.VolCatStatus, "Error", sizeof(dev->VolCatInfo.VolCatStatus));
701 Dmsg0(150, "dir_update_vol_info. Set Error.\n");
702 dir_update_volume_info(this, false, false);
704 Dmsg0(50, "set_unload\n");
705 dev->set_unload(); /* must get a new volume */
709 * The Volume is not in the correct slot, so mark this
710 * Volume as not being in the Changer.
712 void DCR::mark_volume_not_inchanger()
714 Jmsg(jcr, M_ERROR, 0, _("Autochanger Volume \"%s\" not found in slot %d.\n"
715 " Setting InChanger to zero in catalog.\n"),
716 VolCatInfo.VolCatName, VolCatInfo.Slot);
717 dev->VolCatInfo = VolCatInfo; /* structure assignment */
718 VolCatInfo.InChanger = false;
719 dev->VolCatInfo.InChanger = false;
720 Dmsg0(400, "update vol info in mount\n");
721 dir_update_volume_info(this, true, false); /* set new status */
725 * Either because we are going to hang a new volume, or because
726 * of explicit user request, we release the current volume.
728 void DCR::release_volume()
730 unload_autochanger(this, -1);
733 Jmsg0(jcr, M_ERROR, 0, _("Hey!!!!! WroteVol non-zero !!!!!\n"));
734 Pmsg0(190, "Hey!!!!! WroteVol non-zero !!!!!\n");
737 * First erase all memory of the current volume
740 dev->block_num = dev->file = 0;
741 dev->EndBlock = dev->EndFile = 0;
742 memset(&dev->VolCatInfo, 0, sizeof(dev->VolCatInfo));
744 /* Force re-read of label */
745 dev->clear_labeled();
748 dev->label_type = B_BACULA_LABEL;
751 if (dev->is_open() && (!dev->is_tape() || !dev->has_cap(CAP_ALWAYSOPEN))) {
755 /* If we have not closed the device, then at least rewind the tape */
756 if (dev->is_open()) {
757 dev->offline_or_rewind();
759 // Dmsg0(50, "set_unload\n");
760 // dev->set_unload();
761 Dmsg0(190, "release_volume\n");
767 * Check to see if the tape position as defined by the OS is
768 * the same as our concept. If it is not,
769 * it means the user has probably manually rewound the tape.
770 * Note, we check only if num_writers == 0, but this code will
771 * also work fine for any number of writers. If num_writers > 0,
772 * we probably should cancel all jobs using this device, or
773 * perhaps even abort the SD, or at a minimum, mark the tape
774 * in error. Another strategy with num_writers == 0, would be
775 * to rewind the tape and do a new eod() request.
777 bool DCR::is_tape_position_ok()
779 if (dev->is_tape() && dev->num_writers == 0) {
780 int32_t file = dev->get_os_tape_file();
781 if (file >= 0 && file != (int32_t)dev->get_file()) {
782 Jmsg(jcr, M_ERROR, 0, _("Invalid tape position on volume \"%s\""
783 " on device %s. Expected %d, got %d\n"),
784 dev->VolHdr.VolumeName, dev->print_name(), dev->get_file(), file);
786 * If the current file is greater than zero, it means we probably
787 * have some bad count of EOF marks, so mark tape in error. Otherwise
788 * the operator might have moved the tape, so we just release it
792 mark_volume_in_error();
803 * If we are reading, we come here at the end of the tape
804 * and see if there are more volumes to be mounted.
806 bool mount_next_read_volume(DCR *dcr)
808 DEVICE *dev = dcr->dev;
810 Dmsg2(90, "NumReadVolumes=%d CurReadVolume=%d\n", jcr->NumReadVolumes, jcr->CurReadVolume);
812 volume_unused(dcr); /* release current volume */
814 * End Of Tape -- mount next Volume (if another specified)
816 if (jcr->NumReadVolumes > 1 && jcr->CurReadVolume < jcr->NumReadVolumes) {
818 if (!acquire_device_for_read(dcr)) {
819 Jmsg2(jcr, M_FATAL, 0, _("Cannot open Dev=%s, Vol=%s\n"), dev->print_name(),
823 return true; /* next volume mounted */
825 Dmsg0(90, "End of Device reached.\n");