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);
43 /*********************************************************************
44 * Acquire device for reading.
45 * The drive should have previously been reserved by calling
46 * reserve_device_for_read(). We read the Volume label from the block and
47 * leave the block pointers just after the label.
49 * Returns: NULL if failed for any reason
52 bool acquire_device_for_read(DCR *dcr)
54 DEVICE *dev = dcr->dev;
57 bool tape_previously_mounted;
58 bool tape_initially_mounted;
60 bool try_autochanger = true;
65 Dmsg1(950, "jcr->dcr=%p\n", jcr->dcr);
66 dev->dblock(BST_DOING_ACQUIRE);
68 if (dev->num_writers > 0) {
69 Jmsg2(jcr, M_FATAL, 0, _("Acquire read: num_writers=%d not zero. Job %d canceled.\n"),
70 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;
103 * If the MediaType requested for this volume is not the
104 * same as the current drive, we attempt to find the same
105 * device that was used to write the orginal volume. If
106 * found, we switch to using that device.
108 * N.B. A lot of routines rely on the dcr pointer not changing
109 * read_records.c even has multiple dcrs cached, so we take care
110 * here to release all important parts of the dcr and re-acquire
111 * them such as the block pointer (size may change), but we do
112 * not release the dcr.
114 Dmsg2(50, "MediaType dcr=%s dev=%s\n", dcr->media_type, dev->device->media_type);
115 if (dcr->media_type[0] && strcmp(dcr->media_type, dev->device->media_type) != 0) {
120 Jmsg3(jcr, M_INFO, 0, _("Changing device. Want Media Type=\"%s\" have=\"%s\"\n"
122 dcr->media_type, dev->device->media_type, dev->print_name());
123 Dmsg3(50, "Changing device. Want Media Type=\"%s\" have=\"%s\"\n"
125 dcr->media_type, dev->device->media_type, dev->print_name());
127 dev->dunblock(DEV_UNLOCKED);
130 memset(&rctx, 0, sizeof(RCTX));
132 jcr->reserve_msgs = New(alist(10, not_owned_by_alist));
133 rctx.any_drive = true;
134 rctx.device_name = vol->device;
135 store = new DIRSTORE;
136 memset(store, 0, sizeof(DIRSTORE));
137 store->name[0] = 0; /* No dir name */
138 bstrncpy(store->media_type, vol->MediaType, sizeof(store->media_type));
139 bstrncpy(store->pool_name, dcr->pool_name, sizeof(store->pool_name));
140 bstrncpy(store->pool_type, dcr->pool_type, sizeof(store->pool_type));
141 store->append = false;
143 clean_device(dcr); /* clean up the dcr */
146 * Search for a new device
148 stat = search_res_for_device(rctx);
149 release_reserve_messages(jcr); /* release queued messages */
150 unlock_reservations();
153 dev = dcr->dev; /* get new device pointer */
154 dev->dblock(BST_DOING_ACQUIRE);
155 dcr->VolumeName[0] = 0;
156 Jmsg(jcr, M_INFO, 0, _("Media Type change. New device %s chosen.\n"),
158 Dmsg1(50, "Media Type change. New device %s chosen.\n", dev->print_name());
160 bstrncpy(dcr->VolumeName, vol->VolumeName, sizeof(dcr->VolumeName));
161 bstrncpy(dcr->VolCatInfo.VolCatName, vol->VolumeName, sizeof(dcr->VolCatInfo.VolCatName));
162 bstrncpy(dcr->media_type, vol->MediaType, sizeof(dcr->media_type));
163 dcr->VolCatInfo.Slot = vol->Slot;
164 dcr->VolCatInfo.InChanger = vol->Slot > 0;
165 bstrncpy(dcr->pool_name, store->pool_name, sizeof(dcr->pool_name));
166 bstrncpy(dcr->pool_type, store->pool_type, sizeof(dcr->pool_type));
169 Jmsg1(jcr, M_FATAL, 0, _("No suitable device found to read Volume \"%s\"\n"),
171 Dmsg1(50, "No suitable device found to read Volume \"%s\"\n", vol->VolumeName);
176 if (reserve_volume(dcr, dcr->VolumeName) == NULL) {
177 Dmsg2(100, "Could not reserve volume %s on %s\n", dcr->VolumeName,
178 dcr->dev->print_name());
179 Jmsg2(jcr, M_FATAL, 0, _("Could not reserve volume %s on %s\n"), dcr->VolumeName,
180 dcr->dev->print_name());
183 if (dev->vol && dev->vol->is_swapping()) {
184 dev->vol->set_slot(vol->Slot);
185 Dmsg3(100, "swapping: slot=%d Vol=%s dev=%s\n", dev->vol->get_slot(),
186 dev->vol->vol_name, dev->print_name());
190 init_device_wait_timers(dcr);
192 tape_previously_mounted = dev->can_read() || dev->can_append() ||
194 tape_initially_mounted = tape_previously_mounted;
197 /* Volume info is always needed because of VolParts */
198 Dmsg1(150, "dir_get_volume_info vol=%s\n", dcr->VolumeName);
199 if (!dir_get_volume_info(dcr, GET_VOL_INFO_FOR_READ)) {
200 Dmsg2(150, "dir_get_vol_info failed for vol=%s: %s\n",
201 dcr->VolumeName, jcr->errmsg);
202 Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
204 dev->set_load(); /* set to load volume */
207 /* If not polling limit retries */
208 if (!dev->poll && retry++ > 10) {
211 dev->clear_labeled(); /* force reread of label */
212 if (job_canceled(jcr)) {
214 Mmsg1(dev->errmsg, _("Job %s canceled.\n"), edit_int64(jcr->JobId, ed1));
215 Jmsg(jcr, M_INFO, 0, dev->errmsg);
216 goto get_out; /* error return */
219 dcr->do_swapping(false/*is_writing*/);
222 * This code ensures that the device is ready for
223 * reading. If it is a file, it opens it.
224 * If it is a tape, it checks the volume name
226 Dmsg1(100, "bstored: open vol=%s\n", dcr->VolumeName);
227 if (dev->open(dcr, OPEN_READ_ONLY) < 0) {
229 Jmsg3(jcr, M_WARNING, 0, _("Read open device %s Volume \"%s\" failed: ERR=%s\n"),
230 dev->print_name(), dcr->VolumeName, dev->bstrerror());
234 Dmsg1(50, "opened dev %s OK\n", dev->print_name());
236 /* Read Volume Label */
237 Dmsg0(50, "calling read-vol-label\n");
238 vol_label_status = read_dev_volume_label(dcr);
239 switch (vol_label_status) {
242 dev->VolCatInfo = dcr->VolCatInfo; /* structure assignment */
246 * Send error message generated by read_dev_volume_label()
247 * only we really had a tape mounted. This supresses superfluous
248 * error messages when nothing is mounted.
250 if (tape_previously_mounted) {
251 Jmsg(jcr, M_WARNING, 0, "%s", jcr->errmsg);
255 if (dev->is_volume_to_unload()) {
258 // if (tape_initially_mounted) {
259 tape_initially_mounted = false;
260 // goto default_path;
262 dev->set_unload(); /* force unload of unwanted tape */
263 if (!unload_autochanger(dcr, -1)) {
264 /* at least free the device so we can re-open with correct volume */
271 Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
273 tape_previously_mounted = true;
276 * If the device requires mount, close it, so the device can be ejected.
278 if (dev->requires_mount()) {
282 /* Call autochanger only once unless ask_sysop called */
283 if (try_autochanger) {
285 Dmsg2(200, "calling autoload Vol=%s Slot=%d\n",
286 dcr->VolumeName, dcr->VolCatInfo.Slot);
287 stat = autoload_device(dcr, 0, NULL);
289 try_autochanger = false;
290 continue; /* try reading volume mounted */
292 /* Try closing and re-opening */
294 if (dev->open(dcr, OPEN_READ_ONLY) >= 0) {
298 Jmsg3(jcr, M_WARNING, 0, _("Read open device %s Volume \"%s\" failed: ERR=%s\n"),
299 dev->print_name(), dcr->VolumeName, dev->bstrerror());
303 /* Mount a specific volume and no other */
304 Dmsg0(200, "calling dir_ask_sysop\n");
305 if (!dir_ask_sysop_to_mount_volume(dcr, ST_READ)) {
306 goto get_out; /* error return */
308 try_autochanger = true; /* permit using autochanger again */
309 continue; /* try reading again */
315 Jmsg1(jcr, M_FATAL, 0, _("Too many errors trying to mount device %s for reading.\n"),
322 set_jcr_job_status(jcr, JS_Running);
323 dir_send_job_status(jcr);
324 Jmsg(jcr, M_INFO, 0, _("Ready to read from volume \"%s\" on device %s.\n"),
325 dcr->VolumeName, dev->print_name());
329 dcr->clear_reserved();
331 * Normally we are blocked, but in at least one error case above
332 * we are not blocked because we unsuccessfully tried changing
335 if (dev->is_blocked()) {
336 dev->dunblock(DEV_LOCKED);
338 dev->dunlock(); /* dunblock() unlock the device too */
340 Dmsg1(950, "jcr->dcr=%p\n", jcr->dcr);
346 * Acquire device for writing. We permit multiple writers.
347 * If this is the first one, we read the label.
349 * Returns: NULL if failed for any reason
351 * Note, normally reserve_device_for_append() is called
352 * before this routine.
354 DCR *acquire_device_for_append(DCR *dcr)
356 DEVICE *dev = dcr->dev;
359 bool have_vol = false;
361 init_device_wait_timers(dcr);
363 dev->dblock(BST_DOING_ACQUIRE);
364 Dmsg1(100, "acquire_append device is %s\n", dev->is_tape()?"tape":
365 (dev->is_dvd()?"DVD":"disk"));
368 * With the reservation system, this should not happen
370 if (dev->can_read()) {
371 Jmsg1(jcr, M_FATAL, 0, _("Want to append, but device %s is busy reading.\n"), dev->print_name());
372 Dmsg1(200, "Want to append but device %s is busy reading.\n", dev->print_name());
377 * have_vol defines whether or not mount_next_write_volume should
378 * ask the Director again about what Volume to use.
380 if (dev->can_append() && dcr->is_suitable_volume_mounted() &&
381 strcmp(dcr->VolCatInfo.VolCatStatus, "Recycle") != 0) {
382 Dmsg0(190, "device already in append.\n");
384 * At this point, the correct tape is already mounted, so
385 * we do not need to do mount_next_write_volume(), unless
386 * we need to recycle the tape.
388 if (dev->num_writers == 0) {
389 memcpy(&dev->VolCatInfo, &dcr->VolCatInfo, sizeof(dev->VolCatInfo));
391 have_vol = dcr->is_tape_position_ok();
395 Dmsg1(190, "jid=%u Do mount_next_write_vol\n", (uint32_t)jcr->JobId);
396 if (!dcr->mount_next_write_volume()) {
397 if (!job_canceled(jcr)) {
398 /* Reduce "noise" -- don't print if job canceled */
399 Jmsg(jcr, M_FATAL, 0, _("Could not ready device %s for append.\n"),
401 Dmsg1(200, "Could not ready device %s for append.\n",
406 Dmsg2(190, "Output pos=%u:%u\n", dcr->dev->file, dcr->dev->block_num);
409 dev->num_writers++; /* we are now a writer */
410 if (jcr->NumWriteVolumes == 0) {
411 jcr->NumWriteVolumes = 1;
413 dev->VolCatInfo.VolCatJobs++; /* increment number of jobs on vol */
414 dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
419 dcr->clear_reserved();
420 dev->dunblock(DEV_LOCKED);
421 return ok ? dcr : NULL;
425 * This job is done, so release the device. From a Unix standpoint,
426 * the device remains open.
428 * Note, if we are spooling, we may enter with the device locked.
429 * However, in all cases, unlock the device when leaving.
432 bool release_device(DCR *dcr)
435 DEVICE *dev = dcr->dev;
439 /* lock only if not already locked by this thread */
440 if (!dcr->is_dev_locked()) {
444 Dmsg2(100, "release_device device %s is %s\n", dev->print_name(), dev->is_tape()?"tape":"disk");
446 /* if device is reserved, job never started, so release the reserve here */
447 dcr->clear_reserved();
449 if (dev->can_read()) {
450 dev->clear_read(); /* clear read bit */
451 Dmsg0(100, "dir_update_vol_info. Release0\n");
452 dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
455 } else if (dev->num_writers > 0) {
457 * Note if WEOT is set, we are at the end of the tape
458 * and may not be positioned correctly, so the
459 * job_media_record and update_vol_info have already been
460 * done, which means we skip them here.
463 Dmsg1(100, "There are %d writers in release_device\n", dev->num_writers);
464 if (dev->is_labeled()) {
465 Dmsg2(200, "dir_create_jobmedia. Release vol=%s dev=%s\n",
466 dev->VolCatInfo.VolCatName, dev->print_name());
467 if (!dev->at_weot() && !dir_create_jobmedia_record(dcr)) {
468 Jmsg(jcr, M_FATAL, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
469 dcr->VolCatInfo.VolCatName, jcr->Job);
471 /* If no more writers, and no errors, and wrote something, write an EOF */
472 if (!dev->num_writers && dev->can_write() && dev->block_num > 0) {
474 write_ansi_ibm_labels(dcr, ANSI_EOF_LABEL, dev->VolHdr.VolumeName);
476 if (!dev->at_weot()) {
477 dev->VolCatInfo.VolCatFiles = dev->file; /* set number of files */
478 /* Note! do volume update before close, which zaps VolCatInfo */
479 dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
480 Dmsg2(200, "dir_update_vol_info. Release vol=%s dev=%s\n",
481 dev->VolCatInfo.VolCatName, dev->print_name());
483 if (dev->num_writers == 0) { /* if not being used */
484 volume_unused(dcr); /* we obviously are not using the volume */
490 * If we reach here, it is most likely because the job
491 * has failed, since the device is not in read mode and
492 * there are no writers. It was probably reserved.
497 Dmsg3(100, "%d writers, %d reserve, dev=%s\n", dev->num_writers, dev->num_reserved(),
499 debug_list_volumes("acquire:release_device()");
502 /* If no writers, close if file or !CAP_ALWAYS_OPEN */
503 if (dev->num_writers == 0 && (!dev->is_tape() || !dev->has_cap(CAP_ALWAYSOPEN))) {
504 dvd_remove_empty_part(dcr); /* get rid of any empty spool part */
508 /* Fire off Alert command and include any output */
509 if (!job_canceled(jcr) && dcr->device->alert_command) {
513 char line[MAXSTRING];
514 alert = get_pool_memory(PM_FNAME);
515 alert = edit_device_codes(dcr, alert, dcr->device->alert_command, "");
516 bpipe = open_bpipe(alert, 0, "r");
518 while (fgets(line, sizeof(line), bpipe->rfd)) {
519 Jmsg(jcr, M_ALERT, 0, _("Alert: %s"), line);
521 status = close_bpipe(bpipe);
527 Jmsg(jcr, M_ALERT, 0, _("3997 Bad alert command: %s: ERR=%s.\n"),
528 alert, be.bstrerror(status));
531 Dmsg1(400, "alert status=%d\n", status);
532 free_pool_memory(alert);
534 pthread_cond_broadcast(&dev->wait_next_vol);
535 Dmsg2(100, "JobId=%u broadcast wait_device_release at %s\n",
536 (uint32_t)jcr->JobId, bstrftimes(tbuf, sizeof(tbuf), (utime_t)time(NULL)));
537 pthread_cond_broadcast(&wait_device_release);
540 detach_dcr_from_dev(dcr);
542 if (jcr->read_dcr == dcr) {
543 jcr->read_dcr = NULL;
545 if (jcr->dcr == dcr) {
550 Dmsg2(100, "===== Device %s released by JobId=%u\n", dev->print_name(),
551 (uint32_t)jcr->JobId);
556 * Clean up the device for reuse without freeing the memory
558 bool clean_device(DCR *dcr)
561 dcr->keep_dcr = true; /* do not free the dcr */
562 ok = release_device(dcr);
563 dcr->keep_dcr = false;
568 * Create a new Device Control Record and attach
569 * it to the device (if this is a real job).
570 * Note, this has been updated so that it can be called first
571 * without a DEVICE, then a second or third time with a DEVICE,
572 * and each time, it should cleanup and point to the new device.
573 * This should facilitate switching devices.
574 * Note, each dcr must point to the controlling job (jcr). However,
575 * a job can have multiple dcrs, so we must not store in the jcr's
576 * structure as previously. The higher level routine must store
577 * this dcr in the right place
580 DCR *new_dcr(JCR *jcr, DCR *dcr, DEVICE *dev)
583 dcr = (DCR *)malloc(sizeof(DCR));
584 memset(dcr, 0, sizeof(DCR));
585 dcr->tid = pthread_self();
588 dcr->jcr = jcr; /* point back to jcr */
589 /* Set device information, possibly change device */
592 free_block(dcr->block);
594 dcr->block = new_block(dev);
596 free_record(dcr->rec);
598 dcr->rec = new_record();
599 if (dcr->attached_to_dev) {
600 detach_dcr_from_dev(dcr);
602 /* Use job spoolsize prior to device spoolsize */
603 if (jcr->spool_size) {
604 dcr->max_job_spool_size = jcr->spool_size;
606 dcr->max_job_spool_size = dev->device->max_job_spool_size;
608 dcr->device = dev->device;
610 attach_dcr_to_dev(dcr);
616 * Search the dcrs list for the given dcr. If it is found,
617 * as it should be, then remove it. Also zap the jcr pointer
618 * to the dcr if it is the same one.
620 * Note, this code will be turned on when we can write to multiple
621 * dcrs at the same time.
624 static void remove_dcr_from_dcrs(DCR *dcr)
630 int num = jcr->dcrs->size();
631 for (i=0; i < num; i++) {
632 ldcr = (DCR *)jcr->dcrs->get(i);
634 jcr->dcrs->remove(i);
635 if (jcr->dcr == dcr) {
644 static void attach_dcr_to_dev(DCR *dcr)
646 DEVICE *dev = dcr->dev;
649 if (jcr) Dmsg1(500, "JobId=%u enter attach_dcr_to_dev\n", (uint32_t)jcr->JobId);
650 if (!dcr->attached_to_dev && dev->initiated && jcr && jcr->JobType != JT_SYSTEM) {
651 dev->attached_dcrs->append(dcr); /* attach dcr to device */
652 dcr->attached_to_dev = true;
653 Dmsg1(500, "JobId=%u attach_dcr_to_dev\n", (uint32_t)jcr->JobId);
657 void detach_dcr_from_dev(DCR *dcr)
659 DEVICE *dev = dcr->dev;
660 Dmsg0(500, "Enter detach_dcr_from_dev\n"); /* jcr is NULL in some cases */
662 /* Detach this dcr only if attached */
663 if (dcr->attached_to_dev && dev) {
665 dcr->unreserve_device();
666 dcr->dev->attached_dcrs->remove(dcr); /* detach dcr from device */
667 dcr->attached_to_dev = false;
668 // remove_dcr_from_dcrs(dcr); /* remove dcr from jcr list */
674 * Free up all aspects of the given dcr -- i.e. dechain it,
675 * release allocated memory, zap pointers, ...
677 void free_dcr(DCR *dcr)
681 detach_dcr_from_dev(dcr);
684 free_block(dcr->block);
687 free_record(dcr->rec);
689 if (jcr && jcr->dcr == dcr) {