2 * Routines to acquire and release a device for read/write
4 * Kern Sibbald, August MMII
9 Copyright (C) 2000, 2001, 2002 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 */
32 /*********************************************************************
33 * Acquire device for reading. We permit (for the moment)
34 * only one reader. We read the Volume label from the block and
35 * leave the block pointers just after the label.
37 * Returns: 0 if failed for any reason
40 int acquire_device_for_read(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
43 int tape_previously_mounted;
46 block_device(dev, BST_DOING_ACQUIRE);
49 tape_previously_mounted = (dev->state & ST_READ) || (dev->state & ST_APPEND);
51 if (dev->state & ST_READ || dev->num_writers > 0) {
52 Jmsg1(jcr, M_FATAL, 0, _("Device %s is busy. Job cancelled.\n"), dev_name(dev));
57 if (job_cancelled(jcr)) {
58 Mmsg0(&dev->errmsg, _("Job cancelled.\n"));
59 goto get_out; /* error return */
62 * This code ensures that the device is ready for
63 * reading. If it is a file, it opens it.
64 * If it is a tape, it checks the volume name
66 for ( ; !(dev->state & ST_OPENED); ) {
67 Dmsg1(120, "bstored: open vol=%s\n", jcr->VolumeName);
68 if (open_dev(dev, jcr->VolumeName, READ_ONLY) < 0) {
69 Jmsg(jcr, M_FATAL, 0, _("Open device %s volume %s failed, ERR=%s\n"),
70 dev_name(dev), jcr->VolumeName, strerror_dev(dev));
73 Dmsg1(129, "open_dev %s OK\n", dev_name(dev));
75 /* ***FIXME*** this is probably not necessary */
76 dev->state &= ~ST_LABEL; /* force reread of label */
77 Dmsg0(200, "calling read-vol-label\n");
78 switch (read_dev_volume_label(jcr, dev, block)) {
83 * Send error message generated by read_dev_volume_label()
84 * only we really had a tape mounted. This supresses superfluous
85 * error messages when nothing is mounted.
87 if (tape_previously_mounted) {
88 Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
92 Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
94 tape_previously_mounted = 0;
95 Dmsg0(200, "dir_get_volume_info\n");
96 if (!dir_get_volume_info(jcr, 0)) {
97 Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
99 Dmsg2(200, "calling autoload Vol=%s Slot=%d\n",
100 jcr->VolumeName, jcr->VolCatInfo.Slot);
101 if (autoload_device(jcr, dev, 0, NULL)) {
104 /* Mount a specific volume and no other */
105 Dmsg0(200, "calling dir_ask_sysop\n");
106 if (!dir_ask_sysop_to_mount_volume(jcr, dev)) {
107 goto get_out; /* error return */
109 continue; /* try reading again */
114 dev->state |= ST_READ;
115 attach_jcr_to_device(dev, jcr); /* attach jcr to device */
116 stat = 1; /* good return */
126 * Acquire device for writing. We permit multiple writers.
127 * If this is the first one, we read the label.
129 * Returns: 0 if failed for any reason
132 int acquire_device_for_append(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
139 block_device(dev, BST_DOING_ACQUIRE);
141 Dmsg1(190, "acquire_append device is %s\n", dev_is_tape(dev)?"tape":"disk");
144 if (dev->state & ST_APPEND) {
146 * Device already in append mode
148 * Check if we have the right Volume mounted
149 * OK if current volume info OK
150 * OK if next volume matches current volume
151 * otherwise mount desired volume obtained from
152 * dir_find_next_appendable_volume
154 strcpy(jcr->VolumeName, dev->VolHdr.VolName);
155 if (!dir_get_volume_info(jcr, 1) ||
156 !(dir_find_next_appendable_volume(jcr) &&
157 strcmp(dev->VolHdr.VolName, jcr->VolumeName) == 0)) { /* wrong tape mounted */
158 if (dev->num_writers != 0) {
159 Jmsg(jcr, M_FATAL, 0, _("Device %s is busy writing on another Volume.\n"), dev_name(dev));
162 /* Wrong tape mounted, release it, then fall through to get correct one */
167 /* Not already in append mode, so mount the device */
168 if (dev->state & ST_READ) {
169 Jmsg(jcr, M_FATAL, 0, _("Device %s is busy reading.\n"), dev_name(dev));
172 ASSERT(dev->num_writers == 0);
177 if (!mount_next_write_volume(jcr, dev, block, release)) {
178 Jmsg(jcr, M_FATAL, 0, _("Could not ready device %s for append.\n"),
185 if (dev->num_writers > 1) {
186 Dmsg2(100, "Hey!!!! There are %d writers on device %s\n", dev->num_writers,
189 if (jcr->NumVolumes == 0) {
192 attach_jcr_to_device(dev, jcr); /* attach jcr to device */
193 stat = 1; /* good return */
203 * This job is done, so release the device. From a Unix standpoint,
204 * the device remains open.
207 int release_device(JCR *jcr, DEVICE *dev)
210 Dmsg1(100, "release_device device is %s\n", dev_is_tape(dev)?"tape":"disk");
211 if (dev->state & ST_READ) {
212 dev->state &= ~ST_READ; /* clear read bit */
213 if (!dev_is_tape(dev) || !(dev->capabilities & CAP_ALWAYSOPEN)) {
214 if (dev->capabilities & CAP_OFFLINEUNMOUNT) {
219 /******FIXME**** send read volume usage statistics to director */
221 } else if (dev->num_writers > 0) {
223 Dmsg1(100, "There are %d writers in release_device\n", dev->num_writers);
224 if (dev->num_writers == 0) {
226 Dmsg0(100, "dir_create_jobmedia_record. Release\n");
227 dir_create_jobmedia_record(jcr);
228 dev->VolCatInfo.VolCatFiles++; /* increment number of files */
229 dev->VolCatInfo.VolCatJobs++; /* increment number of jobs */
230 /* Note! do volume update before close, which zaps VolCatInfo */
231 Dmsg0(100, "dir_update_vol_info. Release\n");
232 dir_update_volume_info(jcr, &dev->VolCatInfo, 0); /* send Volume info to Director */
234 if (!dev_is_tape(dev) || !(dev->capabilities & CAP_ALWAYSOPEN)) {
235 if (dev->capabilities & CAP_OFFLINEUNMOUNT) {
241 Dmsg0(100, "dir_create_jobmedia_record. Release\n");
242 dir_create_jobmedia_record(jcr);
243 Dmsg0(100, "dir_update_vol_info. Release\n");
244 dev->VolCatInfo.VolCatJobs++; /* increment number of jobs */
245 dir_update_volume_info(jcr, &dev->VolCatInfo, 0); /* send Volume info to Director */
248 Jmsg2(jcr, M_ERROR, 0, _("BAD ERROR: release_device %s, Volume %s not in use.\n"),
249 dev_name(dev), NPRT(jcr->VolumeName));
251 detach_jcr_from_device(dev, jcr);