2 * Routines to acquire and release a device for read/write
4 * Kern Sibbald, August MMII
9 Copyright (C) 2002-2004 Kern Sibbald and John Walker
11 This program is free software; you can redistribute it and/or
12 modify it under the terms of the GNU General Public License as
13 published by the Free Software Foundation; either version 2 of
14 the License, or (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU General Public
22 License along with this program; if not, write to the Free
23 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 #include "bacula.h" /* pull in global headers */
29 #include "stored.h" /* pull in Storage Deamon headers */
31 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
33 DCR *new_dcr(JCR *jcr, DEVICE *dev)
35 if (jcr && jcr->dcr) {
38 DCR *dcr = (DCR *)malloc(sizeof(DCR));
39 memset(dcr, 0, sizeof(DCR));
46 dcr->device = dev->device;
48 dcr->block = new_block(dev);
49 dcr->rec = new_record();
51 dcr->max_spool_size = dev->device->max_spool_size;
52 /* Attach this dcr only if dev is initialized */
53 if (dev->fd != 0 && jcr && jcr->JobType != JT_SYSTEM) {
54 dev->attached_dcrs->append(dcr);
59 void free_dcr(DCR *dcr)
62 DEVICE *dev = dcr->dev;
64 /* Detach this dcr only if the dev is initialized */
65 if (dev->fd != 0 && jcr && jcr->JobType != JT_SYSTEM) {
66 dcr->dev->attached_dcrs->remove(dcr);
69 free_block(dcr->block);
72 free_record(dcr->rec);
81 /*********************************************************************
82 * Acquire device for reading. We permit (for the moment)
83 * only one reader. We read the Volume label from the block and
84 * leave the block pointers just after the label.
86 * Returns: NULL if failed for any reason
89 DCR *acquire_device_for_read(JCR *jcr)
92 bool tape_previously_mounted;
93 bool tape_initially_mounted;
95 bool try_autochanger = true;
100 /* Called for each volume */
102 dcr = new_dcr(jcr, jcr->device->dev);
105 if (device_is_unmounted(dev)) {
106 Jmsg(jcr, M_WARNING, 0, _("device %s is BLOCKED due to user unmount.\n"),
110 block_device(dev, BST_DOING_ACQUIRE);
113 init_dev_wait_timers(dev);
114 if (dev_state(dev, ST_READ) || dev->num_writers > 0) {
115 Jmsg2(jcr, M_FATAL, 0, _("Device %s is busy. Job %d canceled.\n"),
116 dev_name(dev), jcr->JobId);
120 tape_previously_mounted = dev_state(dev, ST_READ) ||
121 dev_state(dev, ST_APPEND) ||
122 dev_state(dev, ST_LABEL);
123 tape_initially_mounted = tape_previously_mounted;
125 /* Find next Volume, if any */
128 Jmsg(jcr, M_FATAL, 0, _("No volumes specified. Job %d canceled.\n"), jcr->JobId);
132 for (i=1; i<jcr->CurVolume; i++) {
135 bstrncpy(dcr->VolumeName, vol->VolumeName, sizeof(dcr->VolumeName));
137 for (i=0; i<5; i++) {
138 dcr->dev->state &= ~ST_LABEL; /* force reread of label */
139 if (job_canceled(jcr)) {
140 Mmsg1(dev->errmsg, _("Job %d canceled.\n"), jcr->JobId);
141 goto get_out; /* error return */
144 * This code ensures that the device is ready for
145 * reading. If it is a file, it opens it.
146 * If it is a tape, it checks the volume name
148 for ( ; !(dev->state & ST_OPENED); ) {
149 Dmsg1(120, "bstored: open vol=%s\n", dcr->VolumeName);
150 if (open_dev(dev, dcr->VolumeName, OPEN_READ_ONLY) < 0) {
151 if (dev->dev_errno == EIO) { /* no tape loaded */
154 Jmsg(jcr, M_FATAL, 0, _("Open device %s volume %s failed, ERR=%s\n"),
155 dev_name(dev), dcr->VolumeName, strerror_dev(dev));
158 Dmsg1(129, "open_dev %s OK\n", dev_name(dev));
160 /****FIXME***** do not reread label if ioctl() says we are
161 * correctly possitioned. Possibly have way user can turn
162 * this optimization (to be implemented) off.
164 Dmsg0(200, "calling read-vol-label\n");
165 switch (read_dev_volume_label(dcr)) {
168 memcpy(&dev->VolCatInfo, &dcr->VolCatInfo, sizeof(dev->VolCatInfo));
172 * Send error message generated by read_dev_volume_label()
173 * only we really had a tape mounted. This supresses superfluous
174 * error messages when nothing is mounted.
176 if (tape_previously_mounted) {
177 Jmsg(jcr, M_WARNING, 0, "%s", jcr->errmsg);
181 if (tape_initially_mounted) {
182 tape_initially_mounted = false;
187 Jmsg(jcr, M_WARNING, 0, "%s", jcr->errmsg);
189 tape_previously_mounted = true;
190 Dmsg0(200, "dir_get_volume_info\n");
191 if (!dir_get_volume_info(dcr, GET_VOL_INFO_FOR_READ)) {
192 Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
194 /* Call autochanger only once unless ask_sysop called */
195 if (try_autochanger) {
197 Dmsg2(200, "calling autoload Vol=%s Slot=%d\n",
198 dcr->VolumeName, dcr->VolCatInfo.Slot);
199 stat = autoload_device(dcr, 0, NULL);
201 try_autochanger = false;
205 /* Mount a specific volume and no other */
206 Dmsg0(200, "calling dir_ask_sysop\n");
207 if (!dir_ask_sysop_to_mount_volume(dcr)) {
208 goto get_out; /* error return */
210 try_autochanger = true; /* permit using autochanger again */
211 continue; /* try reading again */
216 Jmsg1(jcr, M_FATAL, 0, _("Too many errors trying to mount device \"%s\".\n"),
221 dev->state &= ~ST_APPEND; /* clear any previous append mode */
222 dev->state |= ST_READ; /* set read mode */
223 set_jcr_job_status(jcr, JS_Running);
224 dir_send_job_status(jcr);
225 Jmsg(jcr, M_INFO, 0, _("Ready to read from volume \"%s\" on device %s.\n"),
226 dcr->VolumeName, dev_name(dev));
240 * Acquire device for writing. We permit multiple writers.
241 * If this is the first one, we read the label.
243 * Returns: NULL if failed for any reason
244 * dev if successful (may change if new dev opened)
245 * This routine must be single threaded because we may create
246 * multiple devices (for files), thus we have our own mutex
247 * on top of the device mutex.
249 DCR *acquire_device_for_append(JCR *jcr)
251 bool release = false;
252 bool recycle = false;
253 bool do_mount = false;
255 DEVICE *dev = jcr->device->dev;
257 dcr = new_dcr(jcr, dev);
258 if (device_is_unmounted(dev)) {
259 Jmsg(jcr, M_WARNING, 0, _("device %s is BLOCKED due to user unmount.\n"),
263 block_device(dev, BST_DOING_ACQUIRE);
265 P(mutex); /* lock all devices */
266 Dmsg1(190, "acquire_append device is %s\n", dev_is_tape(dev)?"tape":"disk");
268 if (dev_state(dev, ST_APPEND)) {
269 Dmsg0(190, "device already in append.\n");
271 * Device already in append mode
273 * Check if we have the right Volume mounted
274 * OK if current volume info OK
275 * OK if next volume matches current volume
276 * otherwise mount desired volume obtained from
277 * dir_find_next_appendable_volume
279 bstrncpy(dcr->VolumeName, dev->VolHdr.VolName, sizeof(dcr->VolumeName));
280 if (!dir_get_volume_info(dcr, GET_VOL_INFO_FOR_WRITE) &&
281 !(dir_find_next_appendable_volume(dcr) &&
282 strcmp(dev->VolHdr.VolName, dcr->VolumeName) == 0)) { /* wrong tape mounted */
283 Dmsg0(190, "Wrong tape mounted.\n");
284 if (dev->num_writers != 0) {
285 DEVICE *d = ((DEVRES *)dev->device)->dev;
286 uint32_t open_vols = 0;
287 for ( ; d; d=d->next) {
290 if (dev_state(dev, ST_FILE) && dev->max_open_vols > open_vols) {
291 d = init_dev(NULL, (DEVRES *)dev->device); /* init new device */
292 d->prev = dev; /* chain in new device */
295 /* Release old device */
299 free_dcr(dcr); /* release dcr pointing to old dev */
300 /* Make new device current device and lock it */
302 dcr = new_dcr(jcr, dev); /* get new dcr for new device */
304 block_device(dev, BST_DOING_ACQUIRE);
307 Jmsg(jcr, M_FATAL, 0, _("Device %s is busy writing on another Volume.\n"), dev_name(dev));
311 /* Wrong tape mounted, release it, then fall through to get correct one */
312 Dmsg0(190, "Wrong tape mounted, release and try mount.\n");
317 * At this point, the correct tape is already mounted, so
318 * we do not need to do mount_next_write_volume(), unless
319 * we need to recycle the tape.
321 recycle = strcmp(dcr->VolCatInfo.VolCatStatus, "Recycle") == 0;
322 Dmsg1(190, "Correct tape mounted. recycle=%d\n", recycle);
323 if (recycle && dev->num_writers != 0) {
324 Jmsg(jcr, M_FATAL, 0, _("Cannot recycle volume \"%s\""
325 " because it is in use by another job.\n"));
328 if (dev->num_writers == 0) {
329 memcpy(&dev->VolCatInfo, &dcr->VolCatInfo, sizeof(dev->VolCatInfo));
333 /* Not already in append mode, so mount the device */
334 Dmsg0(190, "Not in append mode, try mount.\n");
335 if (dev_state(dev, ST_READ)) {
336 Jmsg(jcr, M_FATAL, 0, _("Device %s is busy reading.\n"), dev_name(dev));
339 ASSERT(dev->num_writers == 0);
343 if (do_mount || recycle) {
344 Dmsg0(190, "Do mount_next_write_vol\n");
345 V(mutex); /* don't lock everything during mount */
346 bool mounted = mount_next_write_volume(dcr, release);
347 P(mutex); /* re-lock */
349 if (!job_canceled(jcr)) {
350 /* Reduce "noise" -- don't print if job canceled */
351 Jmsg(jcr, M_FATAL, 0, _("Could not ready device \"%s\" for append.\n"),
359 if (jcr->NumVolumes == 0) {
362 set_jcr_job_status(jcr, JS_Running);
363 dir_send_job_status(jcr);
367 * If we jump here, it is an error return because
368 * rtn_dev will still be NULL
377 V(mutex); /* unlock other threads */
382 * This job is done, so release the device. From a Unix standpoint,
383 * the device remains open.
386 bool release_device(JCR *jcr)
389 DEVICE *dev = dcr->dev;
391 Dmsg1(100, "release_device device is %s\n", dev_is_tape(dev)?"tape":"disk");
392 if (dev->can_read()) {
393 dev->clear_read(); /* clear read bit */
394 if (!dev_is_tape(dev) || !dev_cap(dev, CAP_ALWAYSOPEN)) {
395 offline_or_rewind_dev(dev);
398 /******FIXME**** send read volume usage statistics to director */
400 } else if (dev->num_writers > 0) {
402 Dmsg1(100, "There are %d writers in release_device\n", dev->num_writers);
403 if (dev->is_labeled()) {
404 Dmsg0(100, "dir_create_jobmedia_record. Release\n");
405 if (!dir_create_jobmedia_record(dcr)) {
406 Jmsg(jcr, M_FATAL, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
407 dcr->VolCatInfo.VolCatName, jcr->Job);
409 /* If no more writers, write an EOF */
410 if (!dev->num_writers && dev_can_write(dev)) {
413 dev->VolCatInfo.VolCatFiles = dev->file; /* set number of files */
414 dev->VolCatInfo.VolCatJobs++; /* increment number of jobs */
415 /* Note! do volume update before close, which zaps VolCatInfo */
416 Dmsg0(100, "dir_update_vol_info. Release0\n");
417 dir_update_volume_info(dcr, false); /* send Volume info to Director */
420 if (!dev->num_writers && (!dev_is_tape(dev) || !dev_cap(dev, CAP_ALWAYSOPEN))) {
421 offline_or_rewind_dev(dev);
425 Jmsg2(jcr, M_FATAL, 0, _("BAD ERROR: release_device %s, Volume \"%s\" not in use.\n"),
426 dev_name(dev), NPRT(dcr->VolumeName));
427 Jmsg2(jcr, M_ERROR, 0, _("num_writers=%d state=%x\n"), dev->num_writers, dev->state);
430 /* Fire off Alert command and include any output */
431 if (!job_canceled(jcr) && jcr->device->alert_command) {
435 char line[MAXSTRING];
436 alert = get_pool_memory(PM_FNAME);
437 alert = edit_device_codes(jcr, alert, jcr->device->alert_command, "");
438 bpipe = open_bpipe(alert, 0, "r");
440 while (fgets(line, sizeof(line), bpipe->rfd)) {
441 Jmsg(jcr, M_ALERT, 0, _("Alert: %s"), line);
443 status = close_bpipe(bpipe);
449 Jmsg(jcr, M_ALERT, 0, _("3997 Bad alert command: %s: ERR=%s.\n"),
450 alert, be.strerror(status));
453 Dmsg1(400, "alert status=%d\n", status);
454 free_pool_memory(alert);
456 if (dev->prev && !dev_state(dev, ST_READ) && !dev->num_writers) {
459 dev->prev->next = dev->next; /* dechain */