2 Bacula® - The Network Backup Solution
4 Copyright (C) 2002-2008 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 John Walker.
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.
29 * Routines to acquire and release a device for read/write
31 * Kern Sibbald, August MMII
36 #include "bacula.h" /* pull in global headers */
37 #include "stored.h" /* pull in Storage Deamon headers */
39 /* Forward referenced functions */
40 static void attach_dcr_to_dev(DCR *dcr);
41 static bool is_tape_position_ok(JCR *jcr, DEVICE *dev);
44 /*********************************************************************
45 * Acquire device for reading.
46 * The drive should have previously been reserved by calling
47 * reserve_device_for_read(). We read the Volume label from the block and
48 * leave the block pointers just after the label.
50 * Returns: NULL if failed for any reason
53 bool acquire_device_for_read(DCR *dcr)
55 DEVICE *dev = dcr->dev;
58 bool tape_previously_mounted;
59 bool tape_initially_mounted;
61 bool try_autochanger = true;
66 Dmsg1(950, "jcr->dcr=%p\n", jcr->dcr);
67 dev->dblock(BST_DOING_ACQUIRE);
69 if (dev->num_writers > 0) {
70 Jmsg2(jcr, M_FATAL, 0, _("Acquire read: num_writers=%d not zero. Job %d canceled.\n"),
71 dev->num_writers, jcr->JobId);
75 /* Find next Volume, if any */
79 Jmsg(jcr, M_FATAL, 0, _("No volumes specified for reading. Job %s canceled.\n"),
80 edit_int64(jcr->JobId, ed1));
84 for (i=1; i<jcr->CurReadVolume; i++) {
88 Jmsg(jcr, M_FATAL, 0, _("Logic error: no next volume to read. Numvol=%d Curvol=%d\n"),
89 jcr->NumReadVolumes, jcr->CurReadVolume);
90 goto get_out; /* should not happen */
93 * Note, if we want to be able to work from a .bsr file only
94 * for disaster recovery, we must "simulate" reading the catalog
96 bstrncpy(dcr->VolumeName, vol->VolumeName, sizeof(dcr->VolumeName));
97 bstrncpy(dcr->VolCatInfo.VolCatName, vol->VolumeName, sizeof(dcr->VolCatInfo.VolCatName));
98 bstrncpy(dcr->media_type, vol->MediaType, sizeof(dcr->media_type));
99 dcr->VolCatInfo.Slot = vol->Slot;
100 dcr->VolCatInfo.InChanger = vol->Slot > 0;
101 if (reserve_volume(dcr, dcr->VolumeName) == NULL) {
102 Dmsg2(100, "Could not reserve volume %s on %s\n", dcr->VolumeName,
103 dcr->dev->print_name());
104 Jmsg2(jcr, M_FATAL, 0, _("Could not reserve volume %s on %s\n"), dcr->VolumeName,
105 dcr->dev->print_name());
108 if (dev->vol && dev->vol->is_swapping()) {
109 dev->vol->set_slot(vol->Slot);
110 Dmsg3(100, "swapping: slot=%d Vol=%s dev=%s\n", dev->vol->get_slot(),
111 dev->vol->vol_name, dev->print_name());
115 * If the MediaType requested for this volume is not the
116 * same as the current drive, we attempt to find the same
117 * device that was used to write the orginal volume. If
118 * found, we switch to using that device.
120 * N.B. A lot of routines rely on the dcr pointer not changing
121 * read_records.c even has multiple dcrs cached, so we take care
122 * here to release all important parts of the dcr and re-acquire
123 * them such as the block pointer (size may change), but we do
124 * not release the dcr.
126 Dmsg2(50, "MediaType dcr=%s dev=%s\n", dcr->media_type, dev->device->media_type);
127 if (dcr->media_type[0] && strcmp(dcr->media_type, dev->device->media_type) != 0) {
132 Jmsg3(jcr, M_INFO, 0, _("Changing device. Want Media Type=\"%s\" have=\"%s\"\n"
134 dcr->media_type, dev->device->media_type, dev->print_name());
135 Dmsg3(50, "Changing device. Want Media Type=\"%s\" have=\"%s\"\n"
137 dcr->media_type, dev->device->media_type, dev->print_name());
139 dev->dunblock(DEV_UNLOCKED);
142 memset(&rctx, 0, sizeof(RCTX));
144 jcr->reserve_msgs = New(alist(10, not_owned_by_alist));
145 rctx.any_drive = true;
146 rctx.device_name = vol->device;
147 store = new DIRSTORE;
148 memset(store, 0, sizeof(DIRSTORE));
149 store->name[0] = 0; /* No dir name */
150 bstrncpy(store->media_type, vol->MediaType, sizeof(store->media_type));
151 bstrncpy(store->pool_name, dcr->pool_name, sizeof(store->pool_name));
152 bstrncpy(store->pool_type, dcr->pool_type, sizeof(store->pool_type));
153 store->append = false;
155 clean_device(dcr); /* clean up the dcr */
158 * Search for a new device
160 stat = search_res_for_device(rctx);
161 release_reserve_messages(jcr); /* release queued messages */
162 unlock_reservations();
165 dev = dcr->dev; /* get new device pointer */
166 dev->dblock(BST_DOING_ACQUIRE);
167 dcr->VolumeName[0] = 0;
168 Jmsg(jcr, M_INFO, 0, _("Media Type change. New device %s chosen.\n"),
170 Dmsg1(50, "Media Type change. New device %s chosen.\n", dev->print_name());
172 bstrncpy(dcr->VolumeName, vol->VolumeName, sizeof(dcr->VolumeName));
173 bstrncpy(dcr->media_type, vol->MediaType, sizeof(dcr->media_type));
174 dcr->VolCatInfo.Slot = vol->Slot;
175 bstrncpy(dcr->pool_name, store->pool_name, sizeof(dcr->pool_name));
176 bstrncpy(dcr->pool_type, store->pool_type, sizeof(dcr->pool_type));
179 Jmsg1(jcr, M_FATAL, 0, _("No suitable device found to read Volume \"%s\"\n"),
181 Dmsg1(50, "No suitable device found to read Volume \"%s\"\n", vol->VolumeName);
187 init_device_wait_timers(dcr);
189 tape_previously_mounted = dev->can_read() || dev->can_append() ||
191 tape_initially_mounted = tape_previously_mounted;
194 /* Volume info is always needed because of VolParts */
195 Dmsg0(200, "dir_get_volume_info\n");
196 if (!dir_get_volume_info(dcr, GET_VOL_INFO_FOR_READ)) {
197 Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
201 /* If not polling limit retries */
202 if (!dev->poll && retry++ > 10) {
205 dev->clear_labeled(); /* force reread of label */
206 if (job_canceled(jcr)) {
208 Mmsg1(dev->errmsg, _("Job %s canceled.\n"), edit_int64(jcr->JobId, ed1));
209 Jmsg(jcr, M_INFO, 0, dev->errmsg);
210 goto get_out; /* error return */
213 dcr->do_swapping(false/*is_writing*/);
216 * This code ensures that the device is ready for
217 * reading. If it is a file, it opens it.
218 * If it is a tape, it checks the volume name
220 Dmsg1(100, "bstored: open vol=%s\n", dcr->VolumeName);
221 if (dev->open(dcr, OPEN_READ_ONLY) < 0) {
222 Jmsg3(jcr, M_WARNING, 0, _("Read open device %s Volume \"%s\" failed: ERR=%s\n"),
223 dev->print_name(), dcr->VolumeName, dev->bstrerror());
226 Dmsg1(50, "opened dev %s OK\n", dev->print_name());
228 /* Read Volume Label */
229 Dmsg0(50, "calling read-vol-label\n");
230 vol_label_status = read_dev_volume_label(dcr);
231 switch (vol_label_status) {
234 memcpy(&dev->VolCatInfo, &dcr->VolCatInfo, sizeof(dev->VolCatInfo));
238 * Send error message generated by read_dev_volume_label()
239 * only we really had a tape mounted. This supresses superfluous
240 * error messages when nothing is mounted.
242 if (tape_previously_mounted) {
243 Jmsg(jcr, M_WARNING, 0, "%s", jcr->errmsg);
247 if (tape_initially_mounted) {
248 tape_initially_mounted = false;
251 /* If polling and got a previous bad name, ignore it */
252 if (dev->poll && strcmp(dev->BadVolName, dev->VolHdr.VolumeName) == 0) {
255 bstrncpy(dev->BadVolName, dev->VolHdr.VolumeName, sizeof(dev->BadVolName));
257 if (!unload_autochanger(dcr, -1)) {
258 /* at least free the device so we can re-open with correct volume */
263 Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
265 tape_previously_mounted = true;
268 * If the device requires mount, close it, so the device can be ejected.
270 if (dev->requires_mount()) {
274 /* Call autochanger only once unless ask_sysop called */
275 if (try_autochanger) {
277 Dmsg2(200, "calling autoload Vol=%s Slot=%d\n",
278 dcr->VolumeName, dcr->VolCatInfo.Slot);
279 stat = autoload_device(dcr, 0, NULL);
281 try_autochanger = false;
282 continue; /* try reading volume mounted */
284 /* Try closing and re-opening */
287 if (dev->open(dcr, OPEN_READ_ONLY) >= 0) {
292 /* Mount a specific volume and no other */
293 Dmsg0(200, "calling dir_ask_sysop\n");
294 if (!dir_ask_sysop_to_mount_volume(dcr, ST_READ)) {
295 goto get_out; /* error return */
297 try_autochanger = true; /* permit using autochanger again */
298 continue; /* try reading again */
303 Jmsg1(jcr, M_FATAL, 0, _("Too many errors trying to mount device %s for reading.\n"),
310 set_jcr_job_status(jcr, JS_Running);
311 dir_send_job_status(jcr);
312 Jmsg(jcr, M_INFO, 0, _("Ready to read from volume \"%s\" on device %s.\n"),
313 dcr->VolumeName, dev->print_name());
317 dcr->clear_reserved();
319 * Normally we are blocked, but in at least one error case above
320 * we are not blocked because we unsuccessfully tried changing
323 if (dev->is_blocked()) {
324 dev->dunblock(DEV_LOCKED);
326 Dmsg1(950, "jcr->dcr=%p\n", jcr->dcr);
332 * Acquire device for writing. We permit multiple writers.
333 * If this is the first one, we read the label.
335 * Returns: NULL if failed for any reason
337 * Note, normally reserve_device_for_append() is called
338 * before this routine.
340 DCR *acquire_device_for_append(DCR *dcr)
342 DEVICE *dev = dcr->dev;
346 init_device_wait_timers(dcr);
348 dev->dblock(BST_DOING_ACQUIRE);
349 Dmsg1(100, "acquire_append device is %s\n", dev->is_tape()?"tape":
350 (dev->is_dvd()?"DVD":"disk"));
353 * With the reservation system, this should not happen
355 if (dev->can_read()) {
356 Jmsg1(jcr, M_FATAL, 0, _("Want to append, but device %s is busy reading.\n"), dev->print_name());
357 Dmsg1(200, "Want to append but device %s is busy reading.\n", dev->print_name());
362 * have_vol defines whether or not mount_next_write_volume should
363 * ask the Director again about what Volume to use.
365 if (dev->can_append() && dcr->is_suitable_volume_mounted() &&
366 strcmp(dcr->VolCatInfo.VolCatStatus, "Recycle") != 0) {
367 Dmsg0(190, "device already in append.\n");
369 * At this point, the correct tape is already mounted, so
370 * we do not need to do mount_next_write_volume(), unless
371 * we need to recycle the tape.
373 if (dev->num_writers == 0) {
374 memcpy(&dev->VolCatInfo, &dcr->VolCatInfo, sizeof(dev->VolCatInfo));
376 if (!is_tape_position_ok(jcr, dev)) {
380 Dmsg1(190, "jid=%u Do mount_next_write_vol\n", (uint32_t)jcr->JobId);
381 if (!dcr->mount_next_write_volume()) {
382 if (!job_canceled(jcr)) {
383 /* Reduce "noise" -- don't print if job canceled */
384 Jmsg(jcr, M_FATAL, 0, _("Could not ready device %s for append.\n"),
386 Dmsg1(200, "Could not ready device %s for append.\n",
391 Dmsg2(190, "Output pos=%u:%u\n", dcr->dev->file, dcr->dev->block_num);
394 dev->num_writers++; /* we are now a writer */
395 if (jcr->NumWriteVolumes == 0) {
396 jcr->NumWriteVolumes = 1;
398 dev->VolCatInfo.VolCatJobs++; /* increment number of jobs on vol */
399 dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
404 dcr->clear_reserved();
405 dev->dunblock(DEV_LOCKED);
406 return ok ? dcr : NULL;
412 * Check to see if the tape position as defined by the OS is
413 * the same as our concept. If it is not, we bail out, because
414 * it means the user has probably manually rewound the tape.
415 * Note, we check only if num_writers == 0, but this code will
416 * also work fine for any number of writers. If num_writers > 0,
417 * we probably should cancel all jobs using this device, or
418 * perhaps even abort the SD, or at a minimum, mark the tape
419 * in error. Another strategy with num_writers == 0, would be
420 * to rewind the tape and do a new eod() request.
422 static bool is_tape_position_ok(JCR *jcr, DEVICE *dev)
424 if (dev->is_tape() && dev->num_writers == 0) {
425 int32_t file = dev->get_os_tape_file();
426 if (file >= 0 && file != (int32_t)dev->get_file()) {
427 Jmsg(jcr, M_FATAL, 0, _("Invalid tape position on volume \"%s\""
428 " on device %s. Expected %d, got %d\n"),
429 dev->VolHdr.VolumeName, dev->print_name(), dev->get_file(), file);
438 * This job is done, so release the device. From a Unix standpoint,
439 * the device remains open.
441 * Note, if we are spooling, we may enter with the device locked.
442 * However, in all cases, unlock the device when leaving.
445 bool release_device(DCR *dcr)
448 DEVICE *dev = dcr->dev;
451 /* lock only if not already locked by this thread */
452 if (!dcr->is_dev_locked()) {
456 Dmsg2(100, "release_device device %s is %s\n", dev->print_name(), dev->is_tape()?"tape":"disk");
458 /* if device is reserved, job never started, so release the reserve here */
459 dcr->clear_reserved();
461 if (dev->can_read()) {
462 dev->clear_read(); /* clear read bit */
463 Dmsg0(100, "dir_update_vol_info. Release0\n");
464 dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
467 } else if (dev->num_writers > 0) {
469 * Note if WEOT is set, we are at the end of the tape
470 * and may not be positioned correctly, so the
471 * job_media_record and update_vol_info have already been
472 * done, which means we skip them here.
475 Dmsg1(100, "There are %d writers in release_device\n", dev->num_writers);
476 if (dev->is_labeled()) {
477 Dmsg2(200, "dir_create_jobmedia. Release vol=%s dev=%s\n",
478 dev->VolCatInfo.VolCatName, dev->print_name());
479 if (!dev->at_weot() && !dir_create_jobmedia_record(dcr)) {
480 Jmsg(jcr, M_FATAL, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
481 dcr->VolCatInfo.VolCatName, jcr->Job);
483 /* If no more writers, and no errors, and wrote something, write an EOF */
484 if (!dev->num_writers && dev->can_write() && dev->block_num > 0) {
486 write_ansi_ibm_labels(dcr, ANSI_EOF_LABEL, dev->VolHdr.VolumeName);
488 if (!dev->at_weot()) {
489 dev->VolCatInfo.VolCatFiles = dev->file; /* set number of files */
490 /* Note! do volume update before close, which zaps VolCatInfo */
491 dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
492 Dmsg2(200, "dir_update_vol_info. Release vol=%s dev=%s\n",
493 dev->VolCatInfo.VolCatName, dev->print_name());
495 if (dev->num_writers == 0) { /* if not being used */
496 // if (!dev->is_busy()) { /* if not being used */
497 volume_unused(dcr); /* we obviously are not using the volume */
503 * If we reach here, it is most likely because the job
504 * has failed, since the device is not in read mode and
505 * there are no writers. It was probably reserved.
510 Dmsg3(100, "%d writers, %d reserve, dev=%s\n", dev->num_writers, dev->num_reserved(),
512 debug_list_volumes("acquire:release_device()");
515 /* If no writers, close if file or !CAP_ALWAYS_OPEN */
516 if (dev->num_writers == 0 && (!dev->is_tape() || !dev->has_cap(CAP_ALWAYSOPEN))) {
517 dvd_remove_empty_part(dcr); /* get rid of any empty spool part */
521 /* Fire off Alert command and include any output */
522 if (!job_canceled(jcr) && dcr->device->alert_command) {
526 char line[MAXSTRING];
527 alert = get_pool_memory(PM_FNAME);
528 alert = edit_device_codes(dcr, alert, dcr->device->alert_command, "");
529 bpipe = open_bpipe(alert, 0, "r");
531 while (fgets(line, sizeof(line), bpipe->rfd)) {
532 Jmsg(jcr, M_ALERT, 0, _("Alert: %s"), line);
534 status = close_bpipe(bpipe);
540 Jmsg(jcr, M_ALERT, 0, _("3997 Bad alert command: %s: ERR=%s.\n"),
541 alert, be.bstrerror(status));
544 Dmsg1(400, "alert status=%d\n", status);
545 free_pool_memory(alert);
547 pthread_cond_broadcast(&dev->wait_next_vol);
548 Dmsg1(100, "JobId=%u broadcast wait_device_release\n", (uint32_t)jcr->JobId);
549 pthread_cond_broadcast(&wait_device_release);
552 detach_dcr_from_dev(dcr);
554 if (jcr->read_dcr == dcr) {
555 jcr->read_dcr = NULL;
557 if (jcr->dcr == dcr) {
562 Dmsg2(100, "===== Device %s released by JobId=%u\n", dev->print_name(),
563 (uint32_t)jcr->JobId);
568 * Clean up the device for reuse without freeing the memory
570 bool clean_device(DCR *dcr)
573 dcr->keep_dcr = true; /* do not free the dcr */
574 ok = release_device(dcr);
575 dcr->keep_dcr = false;
580 * Create a new Device Control Record and attach
581 * it to the device (if this is a real job).
582 * Note, this has been updated so that it can be called first
583 * without a DEVICE, then a second or third time with a DEVICE,
584 * and each time, it should cleanup and point to the new device.
585 * This should facilitate switching devices.
586 * Note, each dcr must point to the controlling job (jcr). However,
587 * a job can have multiple dcrs, so we must not store in the jcr's
588 * structure as previously. The higher level routine must store
589 * this dcr in the right place
592 DCR *new_dcr(JCR *jcr, DCR *dcr, DEVICE *dev)
595 dcr = (DCR *)malloc(sizeof(DCR));
596 memset(dcr, 0, sizeof(DCR));
597 dcr->tid = pthread_self();
600 dcr->jcr = jcr; /* point back to jcr */
601 /* Set device information, possibly change device */
604 free_block(dcr->block);
606 dcr->block = new_block(dev);
608 free_record(dcr->rec);
610 dcr->rec = new_record();
611 if (dcr->attached_to_dev) {
612 detach_dcr_from_dev(dcr);
614 /* Use job spoolsize prior to device spoolsize */
615 if (jcr->spool_size) {
616 dcr->max_job_spool_size = jcr->spool_size;
618 dcr->max_job_spool_size = dev->device->max_job_spool_size;
620 dcr->device = dev->device;
622 attach_dcr_to_dev(dcr);
628 * Search the dcrs list for the given dcr. If it is found,
629 * as it should be, then remove it. Also zap the jcr pointer
630 * to the dcr if it is the same one.
632 * Note, this code will be turned on when we can write to multiple
633 * dcrs at the same time.
636 static void remove_dcr_from_dcrs(DCR *dcr)
642 int num = jcr->dcrs->size();
643 for (i=0; i < num; i++) {
644 ldcr = (DCR *)jcr->dcrs->get(i);
646 jcr->dcrs->remove(i);
647 if (jcr->dcr == dcr) {
656 static void attach_dcr_to_dev(DCR *dcr)
658 DEVICE *dev = dcr->dev;
661 if (jcr) Dmsg1(500, "JobId=%u enter attach_dcr_to_dev\n", (uint32_t)jcr->JobId);
662 if (!dcr->attached_to_dev && dev->initiated && jcr && jcr->JobType != JT_SYSTEM) {
663 dev->attached_dcrs->append(dcr); /* attach dcr to device */
664 dcr->attached_to_dev = true;
665 Dmsg1(500, "JobId=%u attach_dcr_to_dev\n", (uint32_t)jcr->JobId);
669 void detach_dcr_from_dev(DCR *dcr)
671 DEVICE *dev = dcr->dev;
672 Dmsg0(500, "Enter detach_dcr_from_dev\n"); /* jcr is NULL in some cases */
674 /* Detach this dcr only if attached */
675 if (dcr->attached_to_dev && dev) {
677 dcr->unreserve_device();
678 dcr->dev->attached_dcrs->remove(dcr); /* detach dcr from device */
679 dcr->attached_to_dev = false;
680 // remove_dcr_from_dcrs(dcr); /* remove dcr from jcr list */
686 * Free up all aspects of the given dcr -- i.e. dechain it,
687 * release allocated memory, zap pointers, ...
689 void free_dcr(DCR *dcr)
693 detach_dcr_from_dev(dcr);
696 free_block(dcr->block);
699 free_record(dcr->rec);
701 if (jcr && jcr->dcr == dcr) {