2 * Routines to acquire and release a device for read/write
4 * Kern Sibbald, August MMII
9 Copyright (C) 2002-2003 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 /*********************************************************************
34 * Acquire device for reading. We permit (for the moment)
35 * only one reader. We read the Volume label from the block and
36 * leave the block pointers just after the label.
38 * Returns: 0 if failed for any reason
41 int acquire_device_for_read(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
44 int tape_previously_mounted;
49 block_device(dev, BST_DOING_ACQUIRE);
52 tape_previously_mounted = (dev->state & ST_READ) || (dev->state & ST_APPEND);
54 if (dev->state & ST_READ || dev->num_writers > 0) {
55 Jmsg1(jcr, M_FATAL, 0, _("Device %s is busy. Job canceled.\n"), dev_name(dev));
59 /* Find next Volume, if any */
62 Jmsg(jcr, M_FATAL, 0, _("No volumes specified. Job canceled.\n"));
66 for (int i=1; i<jcr->CurVolume; i++) {
69 pm_strcpy(&jcr->VolumeName, vol->VolumeName);
71 for (int i=0; i<5; i++) {
72 if (job_canceled(jcr)) {
73 Mmsg0(&dev->errmsg, _("Job canceled.\n"));
74 goto get_out; /* error return */
77 * This code ensures that the device is ready for
78 * reading. If it is a file, it opens it.
79 * If it is a tape, it checks the volume name
81 for ( ; !(dev->state & ST_OPENED); ) {
82 Dmsg1(120, "bstored: open vol=%s\n", jcr->VolumeName);
83 if (open_dev(dev, jcr->VolumeName, READ_ONLY) < 0) {
84 Jmsg(jcr, M_FATAL, 0, _("Open device %s volume %s failed, ERR=%s\n"),
85 dev_name(dev), jcr->VolumeName, strerror_dev(dev));
88 Dmsg1(129, "open_dev %s OK\n", dev_name(dev));
90 dev->state &= ~ST_LABEL; /* force reread of label */
91 Dmsg0(200, "calling read-vol-label\n");
92 switch (read_dev_volume_label(jcr, dev, block)) {
98 * Send error message generated by read_dev_volume_label()
99 * only we really had a tape mounted. This supresses superfluous
100 * error messages when nothing is mounted.
102 if (tape_previously_mounted) {
103 Jmsg(jcr, M_WARNING, 0, "%s", jcr->errmsg);
107 Jmsg(jcr, M_WARNING, 0, "%s", jcr->errmsg);
109 tape_previously_mounted = 1;
111 invalidate_slot_in_catalog(jcr);
113 Dmsg0(200, "dir_get_volume_info\n");
114 if (!dir_get_volume_info(jcr, 0)) {
115 Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
117 /* Call autochanger only once unless ask_sysop called */
119 Dmsg2(200, "calling autoload Vol=%s Slot=%d\n",
120 jcr->VolumeName, jcr->VolCatInfo.Slot);
121 if ((autochanger=autoload_device(jcr, dev, 0, NULL))) {
125 /* Mount a specific volume and no other */
126 Dmsg0(200, "calling dir_ask_sysop\n");
127 if (!dir_ask_sysop_to_mount_volume(jcr, dev)) {
128 goto get_out; /* error return */
130 autochanger = 0; /* permit using autochanger again */
131 continue; /* try reading again */
136 Jmsg1(jcr, M_FATAL, 0, _("Too many errors trying to mount device \"%s\".\n"),
141 dev->state |= ST_READ;
142 attach_jcr_to_device(dev, jcr); /* attach jcr to device */
143 if ((dev->state & ST_TAPE) && vol->start_file > 0) {
144 Dmsg1(200, "====== Got start_file = %d\n", vol->start_file);
145 Jmsg(jcr, M_INFO, 0, _("Forward spacing to file %d.\n"), vol->start_file);
146 fsf_dev(dev, vol->start_file);
157 * Acquire device for writing. We permit multiple writers.
158 * If this is the first one, we read the label.
160 * Returns: NULL if failed for any reason
161 * dev if successful (may change if new dev opened)
162 * This routine must be single threaded because we may create
163 * multiple devices (for files), thus we have our own mutex
164 * on top of the device mutex.
166 DEVICE * acquire_device_for_append(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
170 DEVICE *rtn_dev = NULL;
173 block_device(dev, BST_DOING_ACQUIRE);
175 P(mutex); /* lock all devices */
176 Dmsg1(190, "acquire_append device is %s\n", dev_is_tape(dev)?"tape":"disk");
179 if (dev->state & ST_APPEND) {
181 * Device already in append mode
183 * Check if we have the right Volume mounted
184 * OK if current volume info OK
185 * OK if next volume matches current volume
186 * otherwise mount desired volume obtained from
187 * dir_find_next_appendable_volume
189 strcpy(jcr->VolumeName, dev->VolHdr.VolName);
190 if (!dir_get_volume_info(jcr, 1) &&
191 !(dir_find_next_appendable_volume(jcr) &&
192 strcmp(dev->VolHdr.VolName, jcr->VolumeName) == 0)) { /* wrong tape mounted */
193 if (dev->num_writers != 0) {
194 DEVICE *d = ((DEVRES *)dev->device)->dev;
195 uint32_t open_vols = 0;
196 for ( ; d; d=d->next) {
199 if (dev->state & ST_FILE && dev->max_open_vols > open_vols) {
200 d = init_dev(NULL, (DEVRES *)dev->device); /* init new device */
201 d->prev = dev; /* chain in new device */
204 /* Release old device */
208 /* Make new device current device and lock it */
211 block_device(dev, BST_DOING_ACQUIRE);
214 Jmsg(jcr, M_FATAL, 0, _("Device %s is busy writing on another Volume.\n"), dev_name(dev));
218 /* Wrong tape mounted, release it, then fall through to get correct one */
223 /* Not already in append mode, so mount the device */
224 if (dev->state & ST_READ) {
225 Jmsg(jcr, M_FATAL, 0, _("Device %s is busy reading.\n"), dev_name(dev));
228 ASSERT(dev->num_writers == 0);
233 if (!mount_next_write_volume(jcr, dev, block, release)) {
234 Jmsg(jcr, M_FATAL, 0, _("Could not ready device %s for append.\n"),
241 if (dev->num_writers > 1) {
242 Dmsg2(100, "Hey!!!! There are %d writers on device %s\n", dev->num_writers,
245 if (jcr->NumVolumes == 0) {
248 attach_jcr_to_device(dev, jcr); /* attach jcr to device */
249 rtn_dev = dev; /* return device */
255 V(mutex); /* unlock other threads */
260 * This job is done, so release the device. From a Unix standpoint,
261 * the device remains open.
264 int release_device(JCR *jcr, DEVICE *dev)
267 Dmsg1(100, "release_device device is %s\n", dev_is_tape(dev)?"tape":"disk");
268 if (dev->state & ST_READ) {
269 dev->state &= ~ST_READ; /* clear read bit */
270 if (!dev_is_tape(dev) || !dev_cap(dev, CAP_ALWAYSOPEN)) {
271 if (dev_cap(dev, CAP_OFFLINEUNMOUNT)) {
276 /******FIXME**** send read volume usage statistics to director */
278 } else if (dev->num_writers > 0) {
280 if (dev->state & ST_TAPE) {
281 jcr->EndBlock = dev->EndBlock;
282 jcr->EndFile = dev->EndFile;
283 Dmsg2(200, "Release device: EndFile=%u EndBlock=%u\n", jcr->EndFile, jcr->EndBlock);
285 jcr->EndBlock = (uint32_t)dev->file_addr;
286 jcr->EndFile = (uint32_t)(dev->file_addr >> 32);
288 Dmsg1(100, "There are %d writers in release_device\n", dev->num_writers);
289 if (dev->num_writers == 0) {
290 Dmsg0(100, "dir_create_jobmedia_record. Release\n");
291 dir_create_jobmedia_record(jcr);
293 dev->VolCatInfo.VolCatFiles = dev->file; /* set number of files */
294 dev->VolCatInfo.VolCatJobs++; /* increment number of jobs */
295 /* Note! do volume update before close, which zaps VolCatInfo */
296 Dmsg0(200, "dir_update_vol_info. Release0\n");
297 dir_update_volume_info(jcr, &dev->VolCatInfo, 0); /* send Volume info to Director */
299 if (!dev_is_tape(dev) || !dev_cap(dev, CAP_ALWAYSOPEN)) {
300 if (dev_cap(dev, CAP_OFFLINEUNMOUNT)) {
306 Dmsg0(100, "dir_create_jobmedia_record. Release\n");
307 dir_create_jobmedia_record(jcr);
308 Dmsg0(200, "dir_update_vol_info. Release1\n");
309 dev->VolCatInfo.VolCatFiles = dev->file; /* set number of files */
310 dev->VolCatInfo.VolCatJobs++; /* increment number of jobs */
311 dir_update_volume_info(jcr, &dev->VolCatInfo, 0); /* send Volume info to Director */
314 Jmsg2(jcr, M_ERROR, 0, _("BAD ERROR: release_device %s, Volume %s not in use.\n"),
315 dev_name(dev), NPRT(jcr->VolumeName));
317 detach_jcr_from_device(dev, jcr);
318 if (dev->prev && !(dev->state & ST_READ) && dev->num_writers == 0) {
321 dev->prev->next = dev->next; /* dechain */