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.
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 void set_dcr_from_vol(DCR *dcr, VOL_LIST *vol);
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 */
92 set_dcr_from_vol(dcr, vol);
94 Dmsg2(100, "Want Vol=%s Slot=%d\n", vol->VolumeName, vol->Slot);
97 * If the MediaType requested for this volume is not the
98 * same as the current drive, we attempt to find the same
99 * device that was used to write the orginal volume. If
100 * found, we switch to using that device.
102 * N.B. A lot of routines rely on the dcr pointer not changing
103 * read_records.c even has multiple dcrs cached, so we take care
104 * here to release all important parts of the dcr and re-acquire
105 * them such as the block pointer (size may change), but we do
106 * not release the dcr.
108 Dmsg2(50, "MediaType dcr=%s dev=%s\n", dcr->media_type, dev->device->media_type);
109 if (dcr->media_type[0] && strcmp(dcr->media_type, dev->device->media_type) != 0) {
114 Jmsg3(jcr, M_INFO, 0, _("Changing read device. Want Media Type=\"%s\" have=\"%s\"\n"
116 dcr->media_type, dev->device->media_type, dev->print_name());
117 Dmsg3(50, "Changing read device. Want Media Type=\"%s\" have=\"%s\"\n"
119 dcr->media_type, dev->device->media_type, dev->print_name());
121 dev->dunblock(DEV_UNLOCKED);
124 memset(&rctx, 0, sizeof(RCTX));
126 jcr->reserve_msgs = New(alist(10, not_owned_by_alist));
127 rctx.any_drive = true;
128 rctx.device_name = vol->device;
129 store = new DIRSTORE;
130 memset(store, 0, sizeof(DIRSTORE));
131 store->name[0] = 0; /* No dir name */
132 bstrncpy(store->media_type, vol->MediaType, sizeof(store->media_type));
133 bstrncpy(store->pool_name, dcr->pool_name, sizeof(store->pool_name));
134 bstrncpy(store->pool_type, dcr->pool_type, sizeof(store->pool_type));
135 store->append = false;
137 clean_device(dcr); /* clean up the dcr */
140 * Search for a new device
142 stat = search_res_for_device(rctx);
143 release_reserve_messages(jcr); /* release queued messages */
144 unlock_reservations();
147 dev = dcr->dev; /* get new device pointer */
148 dev->dblock(BST_DOING_ACQUIRE);
149 dcr->VolumeName[0] = 0;
150 Jmsg(jcr, M_INFO, 0, _("Media Type change. New read device %s chosen.\n"),
152 Dmsg1(50, "Media Type change. New read device %s chosen.\n", dev->print_name());
154 bstrncpy(dcr->VolumeName, vol->VolumeName, sizeof(dcr->VolumeName));
155 bstrncpy(dcr->VolCatInfo.VolCatName, vol->VolumeName, sizeof(dcr->VolCatInfo.VolCatName));
156 bstrncpy(dcr->media_type, vol->MediaType, sizeof(dcr->media_type));
157 dcr->VolCatInfo.Slot = vol->Slot;
158 dcr->VolCatInfo.InChanger = vol->Slot > 0;
159 bstrncpy(dcr->pool_name, store->pool_name, sizeof(dcr->pool_name));
160 bstrncpy(dcr->pool_type, store->pool_type, sizeof(dcr->pool_type));
163 Jmsg1(jcr, M_FATAL, 0, _("No suitable device found to read Volume \"%s\"\n"),
165 Dmsg1(50, "No suitable device found to read Volume \"%s\"\n", vol->VolumeName);
172 if (dev->vol && dev->vol->is_swapping()) {
173 dev->vol->set_slot(vol->Slot);
174 Dmsg3(100, "swapping: slot=%d Vol=%s dev=%s\n", dev->vol->get_slot(),
175 dev->vol->vol_name, dev->print_name());
178 init_device_wait_timers(dcr);
180 tape_previously_mounted = dev->can_read() || dev->can_append() ||
182 tape_initially_mounted = tape_previously_mounted;
185 /* Volume info is always needed because of VolParts */
186 Dmsg1(150, "dir_get_volume_info vol=%s\n", dcr->VolumeName);
187 if (!dir_get_volume_info(dcr, GET_VOL_INFO_FOR_READ)) {
188 Dmsg2(150, "dir_get_vol_info failed for vol=%s: %s\n",
189 dcr->VolumeName, jcr->errmsg);
190 Jmsg1(jcr, M_WARNING, 0, "Read acquire: %s", jcr->errmsg);
192 dev->set_load(); /* set to load volume */
195 /* If not polling limit retries */
196 if (!dev->poll && retry++ > 10) {
199 dev->clear_labeled(); /* force reread of label */
200 if (job_canceled(jcr)) {
202 Mmsg1(dev->errmsg, _("Job %s canceled.\n"), edit_int64(jcr->JobId, ed1));
203 Jmsg(jcr, M_INFO, 0, dev->errmsg);
204 goto get_out; /* error return */
208 dcr->do_swapping(false/*!is_writing*/);
209 dcr->do_load(false /*!is_writing*/);
210 set_dcr_from_vol(dcr, vol); /* refresh dcr with desired volume info */
213 * This code ensures that the device is ready for
214 * reading. If it is a file, it opens it.
215 * If it is a tape, it checks the volume name
217 Dmsg1(100, "bstored: open vol=%s\n", dcr->VolumeName);
218 if (dev->open(dcr, OPEN_READ_ONLY) < 0) {
220 Jmsg3(jcr, M_WARNING, 0, _("Read open device %s Volume \"%s\" failed: ERR=%s\n"),
221 dev->print_name(), dcr->VolumeName, dev->bstrerror());
225 Dmsg1(50, "opened dev %s OK\n", dev->print_name());
227 /* Read Volume Label */
228 Dmsg0(50, "calling read-vol-label\n");
229 vol_label_status = read_dev_volume_label(dcr);
230 switch (vol_label_status) {
232 Dmsg0(50, "Got correct volume.\n");
234 dev->VolCatInfo = dcr->VolCatInfo; /* structure assignment */
237 Dmsg0(50, "IO Error\n");
239 * Send error message generated by read_dev_volume_label()
240 * only we really had a tape mounted. This supresses superfluous
241 * error messages when nothing is mounted.
243 if (tape_previously_mounted) {
244 Jmsg(jcr, M_WARNING, 0, "Read acquire: %s", jcr->errmsg);
248 Dmsg0(50, "Vol name error.\n");
249 if (dev->is_volume_to_unload()) {
252 dev->set_unload(); /* force unload of unwanted tape */
253 if (!unload_autochanger(dcr, -1)) {
254 /* at least free the device so we can re-open with correct volume */
260 Jmsg1(jcr, M_WARNING, 0, "Read acquire: %s", jcr->errmsg);
262 Dmsg0(50, "default path\n");
263 tape_previously_mounted = true;
266 * If the device requires mount, close it, so the device can be ejected.
268 if (dev->requires_mount()) {
272 /* Call autochanger only once unless ask_sysop called */
273 if (try_autochanger) {
275 Dmsg2(200, "calling autoload Vol=%s Slot=%d\n",
276 dcr->VolumeName, dcr->VolCatInfo.Slot);
277 stat = autoload_device(dcr, 0, NULL);
279 try_autochanger = false;
280 continue; /* try reading volume mounted */
284 /* Mount a specific volume and no other */
285 Dmsg0(200, "calling dir_ask_sysop\n");
286 if (!dir_ask_sysop_to_mount_volume(dcr, ST_READ)) {
287 goto get_out; /* error return */
290 /* Volume info is always needed because of VolParts */
291 Dmsg1(150, "dir_get_volume_info vol=%s\n", dcr->VolumeName);
292 if (!dir_get_volume_info(dcr, GET_VOL_INFO_FOR_READ)) {
293 Dmsg2(150, "dir_get_vol_info failed for vol=%s: %s\n",
294 dcr->VolumeName, jcr->errmsg);
295 Jmsg1(jcr, M_WARNING, 0, "Read acquire: %s", jcr->errmsg);
297 dev->set_load(); /* set to load volume */
299 try_autochanger = true; /* permit trying the autochanger again */
301 continue; /* try reading again */
307 Jmsg1(jcr, M_FATAL, 0, _("Too many errors trying to mount device %s for reading.\n"),
314 set_jcr_job_status(jcr, JS_Running);
315 dir_send_job_status(jcr);
316 Jmsg(jcr, M_INFO, 0, _("Ready to read from volume \"%s\" on device %s.\n"),
317 dcr->VolumeName, dev->print_name());
321 dcr->clear_reserved();
323 * Normally we are blocked, but in at least one error case above
324 * we are not blocked because we unsuccessfully tried changing
327 if (dev->is_blocked()) {
328 dev->dunblock(DEV_LOCKED);
330 dev->dunlock(); /* dunblock() unlock the device too */
332 Dmsg1(950, "jcr->dcr=%p\n", jcr->dcr);
336 static pthread_mutex_t acquire_lock = PTHREAD_MUTEX_INITIALIZER;
339 * Acquire device for writing. We permit multiple writers.
340 * If this is the first one, we read the label.
342 * Returns: NULL if failed for any reason
344 * Note, normally reserve_device_for_append() is called
345 * before this routine.
347 DCR *acquire_device_for_append(DCR *dcr)
349 DEVICE *dev = dcr->dev;
352 bool have_vol = false;
354 init_device_wait_timers(dcr);
356 P(acquire_lock); /* only one job at a time */
358 Dmsg1(100, "acquire_append device is %s\n", dev->is_tape()?"tape":
359 (dev->is_dvd()?"DVD":"disk"));
362 * With the reservation system, this should not happen
364 if (dev->can_read()) {
365 Jmsg1(jcr, M_FATAL, 0, _("Want to append, but device %s is busy reading.\n"), dev->print_name());
366 Dmsg1(200, "Want to append but device %s is busy reading.\n", dev->print_name());
373 * have_vol defines whether or not mount_next_write_volume should
374 * ask the Director again about what Volume to use.
376 if (dev->can_append() && dcr->is_suitable_volume_mounted() &&
377 strcmp(dcr->VolCatInfo.VolCatStatus, "Recycle") != 0) {
378 Dmsg0(190, "device already in append.\n");
380 * At this point, the correct tape is already mounted, so
381 * we do not need to do mount_next_write_volume(), unless
382 * we need to recycle the tape.
384 if (dev->num_writers == 0) {
385 memcpy(&dev->VolCatInfo, &dcr->VolCatInfo, sizeof(dev->VolCatInfo));
387 have_vol = dcr->is_tape_position_ok();
392 block_device(dev, BST_DOING_ACQUIRE);
394 Dmsg1(190, "jid=%u Do mount_next_write_vol\n", (uint32_t)jcr->JobId);
395 if (!dcr->mount_next_write_volume()) {
396 if (!job_canceled(jcr)) {
397 /* Reduce "noise" -- don't print if job canceled */
398 Jmsg(jcr, M_FATAL, 0, _("Could not ready device %s for append.\n"),
400 Dmsg1(200, "Could not ready device %s for append.\n",
407 Dmsg2(190, "Output pos=%u:%u\n", dcr->dev->file, dcr->dev->block_num);
412 dev->num_writers++; /* we are now a writer */
413 if (jcr->NumWriteVolumes == 0) {
414 jcr->NumWriteVolumes = 1;
416 dev->VolCatInfo.VolCatJobs++; /* increment number of jobs on vol */
417 Dmsg4(100, "=== nwriters=%d nres=%d vcatjob=%d dev=%s\n",
418 dev->num_writers, dev->num_reserved(), dev->VolCatInfo.VolCatJobs,
420 dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
424 dcr->clear_reserved();
427 return ok ? dcr : NULL;
431 * This job is done, so release the device. From a Unix standpoint,
432 * the device remains open.
434 * Note, if we are spooling, we may enter with the device locked.
435 * However, in all cases, unlock the device when leaving.
438 bool release_device(DCR *dcr)
441 DEVICE *dev = dcr->dev;
445 /* lock only if not already locked by this thread */
446 if (!dcr->is_dev_locked()) {
450 Dmsg2(100, "release_device device %s is %s\n", dev->print_name(), dev->is_tape()?"tape":"disk");
452 /* if device is reserved, job never started, so release the reserve here */
453 dcr->clear_reserved();
455 if (dev->can_read()) {
456 VOLUME_CAT_INFO *vol = &dev->VolCatInfo;
457 dev->clear_read(); /* clear read bit */
458 Dmsg2(150, "dir_update_vol_info. label=%d Vol=%s\n",
459 dev->is_labeled(), vol->VolCatName);
460 if (dev->is_labeled() && vol->VolCatName[0] != 0) {
461 dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
462 remove_read_volume(jcr, dcr->VolumeName);
465 } else if (dev->num_writers > 0) {
467 * Note if WEOT is set, we are at the end of the tape
468 * and may not be positioned correctly, so the
469 * job_media_record and update_vol_info have already been
470 * done, which means we skip them here.
473 Dmsg1(100, "There are %d writers in release_device\n", dev->num_writers);
474 if (dev->is_labeled()) {
475 Dmsg2(200, "dir_create_jobmedia. Release vol=%s dev=%s\n",
476 dev->VolCatInfo.VolCatName, dev->print_name());
477 if (!dev->at_weot() && !dir_create_jobmedia_record(dcr)) {
478 Jmsg2(jcr, M_FATAL, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
479 dcr->VolCatInfo.VolCatName, jcr->Job);
481 /* If no more writers, and no errors, and wrote something, write an EOF */
482 if (!dev->num_writers && dev->can_write() && dev->block_num > 0) {
484 write_ansi_ibm_labels(dcr, ANSI_EOF_LABEL, dev->VolHdr.VolumeName);
486 if (!dev->at_weot()) {
487 dev->VolCatInfo.VolCatFiles = dev->file; /* set number of files */
488 /* Note! do volume update before close, which zaps VolCatInfo */
489 dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
490 Dmsg2(200, "dir_update_vol_info. Release vol=%s dev=%s\n",
491 dev->VolCatInfo.VolCatName, dev->print_name());
493 if (dev->num_writers == 0) { /* if not being used */
494 volume_unused(dcr); /* we obviously are not using the volume */
500 * If we reach here, it is most likely because the job
501 * has failed, since the device is not in read mode and
502 * there are no writers. It was probably reserved.
507 Dmsg3(100, "%d writers, %d reserve, dev=%s\n", dev->num_writers, dev->num_reserved(),
509 debug_list_volumes("acquire:release_device()");
512 /* If no writers, close if file or !CAP_ALWAYS_OPEN */
513 if (dev->num_writers == 0 && (!dev->is_tape() || !dev->has_cap(CAP_ALWAYSOPEN))) {
514 dvd_remove_empty_part(dcr); /* get rid of any empty spool part */
518 /* Fire off Alert command and include any output */
519 if (!job_canceled(jcr) && dcr->device->alert_command) {
523 char line[MAXSTRING];
524 alert = get_pool_memory(PM_FNAME);
525 alert = edit_device_codes(dcr, alert, dcr->device->alert_command, "");
526 bpipe = open_bpipe(alert, 0, "r");
528 while (fgets(line, sizeof(line), bpipe->rfd)) {
529 Jmsg(jcr, M_ALERT, 0, _("Alert: %s"), line);
531 status = close_bpipe(bpipe);
537 Jmsg(jcr, M_ALERT, 0, _("3997 Bad alert command: %s: ERR=%s.\n"),
538 alert, be.bstrerror(status));
541 Dmsg1(400, "alert status=%d\n", status);
542 free_pool_memory(alert);
544 pthread_cond_broadcast(&dev->wait_next_vol);
545 Dmsg2(100, "JobId=%u broadcast wait_device_release at %s\n",
546 (uint32_t)jcr->JobId, bstrftimes(tbuf, sizeof(tbuf), (utime_t)time(NULL)));
547 pthread_cond_broadcast(&wait_device_release);
550 detach_dcr_from_dev(dcr);
552 if (jcr->read_dcr == dcr) {
553 jcr->read_dcr = NULL;
555 if (jcr->dcr == dcr) {
560 Dmsg2(100, "===== Device %s released by JobId=%u\n", dev->print_name(),
561 (uint32_t)jcr->JobId);
566 * Clean up the device for reuse without freeing the memory
568 bool clean_device(DCR *dcr)
571 dcr->keep_dcr = true; /* do not free the dcr */
572 ok = release_device(dcr);
573 dcr->keep_dcr = false;
578 * Create a new Device Control Record and attach
579 * it to the device (if this is a real job).
580 * Note, this has been updated so that it can be called first
581 * without a DEVICE, then a second or third time with a DEVICE,
582 * and each time, it should cleanup and point to the new device.
583 * This should facilitate switching devices.
584 * Note, each dcr must point to the controlling job (jcr). However,
585 * a job can have multiple dcrs, so we must not store in the jcr's
586 * structure as previously. The higher level routine must store
587 * this dcr in the right place
590 DCR *new_dcr(JCR *jcr, DCR *dcr, DEVICE *dev)
593 dcr = (DCR *)malloc(sizeof(DCR));
594 memset(dcr, 0, sizeof(DCR));
595 dcr->tid = pthread_self();
598 dcr->jcr = jcr; /* point back to jcr */
599 /* Set device information, possibly change device */
602 free_block(dcr->block);
604 dcr->block = new_block(dev);
606 free_record(dcr->rec);
608 dcr->rec = new_record();
609 if (dcr->attached_to_dev) {
610 detach_dcr_from_dev(dcr);
612 /* Use job spoolsize prior to device spoolsize */
613 if (jcr->spool_size) {
614 dcr->max_job_spool_size = jcr->spool_size;
616 dcr->max_job_spool_size = dev->device->max_job_spool_size;
618 dcr->device = dev->device;
620 attach_dcr_to_dev(dcr);
626 * Search the dcrs list for the given dcr. If it is found,
627 * as it should be, then remove it. Also zap the jcr pointer
628 * to the dcr if it is the same one.
630 * Note, this code will be turned on when we can write to multiple
631 * dcrs at the same time.
634 static void remove_dcr_from_dcrs(DCR *dcr)
640 int num = jcr->dcrs->size();
641 for (i=0; i < num; i++) {
642 ldcr = (DCR *)jcr->dcrs->get(i);
644 jcr->dcrs->remove(i);
645 if (jcr->dcr == dcr) {
654 static void attach_dcr_to_dev(DCR *dcr)
656 DEVICE *dev = dcr->dev;
659 if (jcr) Dmsg1(500, "JobId=%u enter attach_dcr_to_dev\n", (uint32_t)jcr->JobId);
660 if (!dcr->attached_to_dev && dev->initiated && jcr && jcr->get_JobType() != JT_SYSTEM) {
661 dev->attached_dcrs->append(dcr); /* attach dcr to device */
662 dcr->attached_to_dev = true;
663 Dmsg1(500, "JobId=%u attach_dcr_to_dev\n", (uint32_t)jcr->JobId);
667 void detach_dcr_from_dev(DCR *dcr)
669 DEVICE *dev = dcr->dev;
670 Dmsg0(500, "Enter detach_dcr_from_dev\n"); /* jcr is NULL in some cases */
672 /* Detach this dcr only if attached */
673 if (dcr->attached_to_dev && dev) {
675 dcr->unreserve_device();
676 dcr->dev->attached_dcrs->remove(dcr); /* detach dcr from device */
677 dcr->attached_to_dev = false;
678 // remove_dcr_from_dcrs(dcr); /* remove dcr from jcr list */
684 * Free up all aspects of the given dcr -- i.e. dechain it,
685 * release allocated memory, zap pointers, ...
687 void free_dcr(DCR *dcr)
691 detach_dcr_from_dev(dcr);
694 free_block(dcr->block);
697 free_record(dcr->rec);
699 if (jcr && jcr->dcr == dcr) {
705 static void set_dcr_from_vol(DCR *dcr, VOL_LIST *vol)
708 * Note, if we want to be able to work from a .bsr file only
709 * for disaster recovery, we must "simulate" reading the catalog
711 bstrncpy(dcr->VolumeName, vol->VolumeName, sizeof(dcr->VolumeName));
712 bstrncpy(dcr->VolCatInfo.VolCatName, vol->VolumeName, sizeof(dcr->VolCatInfo.VolCatName));
713 bstrncpy(dcr->media_type, vol->MediaType, sizeof(dcr->media_type));
714 dcr->VolCatInfo.Slot = vol->Slot;
715 dcr->VolCatInfo.InChanger = vol->Slot > 0;