2 Bacula(R) - The Network Backup Solution
4 Copyright (C) 2000-2017 Kern Sibbald
6 The original author of Bacula is Kern Sibbald, with contributions
7 from many others, a complete list can be found in the file AUTHORS.
9 You may use this file and others of this release according to the
10 license defined in the LICENSE file, which includes the Affero General
11 Public License, v3.0 ("AGPLv3") and some additional permissions and
12 terms pursuant to its AGPLv3 Section 7.
14 This notice must be preserved when any source code is
15 conveyed and/or propagated.
17 Bacula(R) is a registered trademark of Kern Sibbald.
21 * Higher Level Device routines.
22 * Knows about Bacula tape labels and such
24 * NOTE! In general, subroutines that have the word
25 * "device" in the name do locking. Subroutines
26 * that have the word "dev" in the name do not
27 * do locking. Thus if xxx_device() calls
28 * yyy_dev(), all is OK, but if xxx_device()
29 * calls yyy_device(), everything will hang.
30 * Obviously, no zzz_dev() is allowed to call
31 * a www_device() or everything falls apart.
33 * Concerning the routines dev->rLock()() and block_device()
34 * see the end of this module for details. In general,
35 * blocking a device leaves it in a state where all threads
36 * other than the current thread block when they attempt to
37 * lock the device. They remain suspended (blocked) until the device
38 * is unblocked. So, a device is blocked during an operation
39 * that takes a long time (initialization, mounting a new
40 * volume, ...) locking a device is done for an operation
41 * that takes a short time such as writing data to the
45 * Kern Sibbald, MM, MMI
49 #include "bacula.h" /* pull in global headers */
50 #include "stored.h" /* pull in Storage Deamon headers */
52 /* Forward referenced functions */
55 * This is the dreaded moment. We either have an end of
56 * medium condition or worse, and error condition.
57 * Attempt to "recover" by obtaining a new Volume.
59 * Here are a few things to know:
60 * dcr->VolCatInfo contains the info on the "current" tape for this job.
61 * dev->VolCatInfo contains the info on the tape in the drive.
62 * The tape in the drive could have changed several times since
63 * the last time the job used it (jcr->VolCatInfo).
64 * dcr->VolumeName is the name of the current/desired tape in the drive.
66 * We enter with device locked, and
67 * exit with device locked.
69 * Note, we are called only from one place in block.c for the daemons.
70 * The btape utility calls it from btape.c.
72 * Returns: true on success
75 bool fixup_device_block_write_error(DCR *dcr, int retries)
77 char PrevVolName[MAX_NAME_LENGTH];
78 DEV_BLOCK *block = dcr->block;
79 DEV_BLOCK *ameta_block = dcr->ameta_block;
80 DEV_BLOCK *adata_block = dcr->adata_block;
83 char dt[MAX_TIME_LENGTH];
86 int blocked; /* save any previous blocked status */
88 bool save_adata = dcr->dev->adata;
92 dcr->set_ameta(); /* switch to working with ameta */
95 blocked = dev->blocked();
97 wait_time = time(NULL);
100 * If we are blocked at entry, unblock it, and set our own block status
102 if (blocked != BST_NOT_BLOCKED) {
105 block_device(dev, BST_DOING_ACQUIRE);
107 /* Continue unlocked, but leave BLOCKED */
110 bstrncpy(PrevVolName, dev->getVolCatName(), sizeof(PrevVolName));
111 bstrncpy(dev->VolHdr.PrevVolumeName, PrevVolName, sizeof(dev->VolHdr.PrevVolumeName));
113 dev->new_dcr_blocks(dcr);
115 /* Inform User about end of medium */
116 Jmsg(jcr, M_INFO, 0, _("End of medium on Volume \"%s\" Bytes=%s Blocks=%s at %s.\n"),
117 PrevVolName, edit_uint64_with_commas(dev->VolCatInfo.VolCatBytes, b1),
118 edit_uint64_with_commas(dev->VolCatInfo.VolCatBlocks, b2),
119 bstrftime(dt, sizeof(dt), time(NULL)));
121 Dmsg1(150, "set_unload dev=%s\n", dev->print_name());
124 /* Clear DCR Start/End Block/File positions */
125 dcr->VolFirstIndex = dcr->VolLastIndex = 0;
126 dcr->StartAddr = dcr->EndAddr = 0;
128 dcr->WroteVol = false;
130 if (!dcr->mount_next_write_volume()) {
131 dev->free_dcr_blocks(dcr);
133 dcr->ameta_block = ameta_block;
134 dcr->adata_block = adata_block;
138 Dmsg2(150, "must_unload=%d dev=%s\n", dev->must_unload(), dev->print_name());
140 dev->notify_newvol_in_attached_dcrs(dcr->VolumeName);
141 dev->Lock(); /* lock again */
143 dev->VolCatInfo.VolCatJobs++; /* increment number of jobs on vol */
144 if (!dir_update_volume_info(dcr, false, false)) { /* send Volume info to Director */
148 Jmsg(jcr, M_INFO, 0, _("New volume \"%s\" mounted on device %s at %s.\n"),
149 dcr->VolumeName, dev->print_name(), bstrftime(dt, sizeof(dt), time(NULL)));
152 * If this is a new tape, the label_blk will contain the
153 * label, so write it now. If this is a previously
154 * used tape, mount_next_write_volume() will return an
155 * empty label_blk, and nothing will be written.
157 Dmsg0(190, "write label block to dev\n");
158 if (!dcr->write_block_to_dev()) {
160 Pmsg1(0, _("write_block_to_device Volume label failed. ERR=%s"),
161 be.bstrerror(dev->dev_errno));
162 dev->free_dcr_blocks(dcr);
164 dcr->ameta_block = ameta_block;
165 dcr->adata_block = adata_block;
168 dev->free_dcr_blocks(dcr);
170 dcr->ameta_block = ameta_block;
171 dcr->adata_block = adata_block;
173 /* Clear NewVol now because dir_get_volume_info() already done */
174 jcr->dcr->NewVol = false;
175 set_new_volume_parameters(dcr);
177 jcr->run_time += time(NULL) - wait_time; /* correct run time for mount wait */
179 /* Write overflow block to device */
180 Dmsg0(190, "Write overflow block to dev\n");
182 dcr->set_adata(); /* try to write block we entered with */
184 if (!dcr->write_block_to_dev()) {
186 Dmsg1(0, _("write_block_to_device overflow block failed. ERR=%s"),
187 be.bstrerror(dev->dev_errno));
188 /* Note: recursive call */
189 if (retries-- <= 0 || !fixup_device_block_write_error(dcr, retries)) {
190 Jmsg2(jcr, M_FATAL, 0,
191 _("Catastrophic error. Cannot write overflow block to device %s. ERR=%s"),
192 dev->print_name(), be.bstrerror(dev->dev_errno));
200 dcr->set_ameta(); /* Do unblock ... on ameta */
203 * At this point, the device is locked and blocked.
204 * Unblock the device, restore any entry blocked condition, then
205 * return leaving the device locked (as it was on entry).
208 if (blocked != BST_NOT_BLOCKED) {
209 block_device(dev, blocked);
212 dcr->set_adata(); /* switch back to what we entered with */
214 return ok; /* device locked */
217 void set_start_vol_position(DCR *dcr)
219 DEVICE *dev = dcr->dev;
220 /* Set new start position */
221 if (dev->is_tape()) {
222 dcr->StartAddr = dcr->EndAddr = dev->get_full_addr();
225 dev = dcr->ameta_dev;
228 * Note: we only update the DCR values for ameta blocks
229 * because all the indexing (JobMedia) is done with
230 * ameta blocks/records, which may point to adata.
232 dcr->StartAddr = dcr->EndAddr = dev->get_full_addr();
237 * We have a new Volume mounted, so reset the Volume parameters
238 * concerning this job. The global changes were made earlier
239 * in the dev structure.
241 void set_new_volume_parameters(DCR *dcr)
244 Dmsg1(40, "set_new_volume_parameters dev=%s\n", dcr->dev->print_name());
246 while (dcr->VolumeName[0] == 0) {
248 wait_for_device(dcr, retries);
250 if (dir_get_volume_info(dcr, dcr->VolumeName, GET_VOL_INFO_FOR_WRITE)) {
251 dcr->dev->clear_wait();
253 Dmsg1(40, "getvolinfo failed. No new Vol: %s", jcr->errmsg);
256 set_new_file_parameters(dcr);
257 jcr->NumWriteVolumes++;
262 * We are now in a new Volume file, so reset the Volume parameters
263 * concerning this job. The global changes were made earlier
264 * in the dev structure.
266 void set_new_file_parameters(DCR *dcr)
268 set_start_vol_position(dcr);
271 Dmsg3(1000, "Reset indices Vol=%s were: FI=%d LI=%d\n", dcr->VolumeName,
272 dcr->VolFirstIndex, dcr->VolLastIndex);
273 dcr->VolFirstIndex = 0;
274 dcr->VolLastIndex = 0;
275 dcr->NewFile = false;
276 dcr->WroteVol = false;
282 * First Open of the device. Expect dev to already be initialized.
284 * This routine is used only when the Storage daemon starts
285 * and always_open is set, and in the stand-alone utility
286 * routines such as bextract.
288 * Note, opening of a normal file is deferred to later so
289 * that we can get the filename; the device_name for
290 * a file is the directory only.
292 * Returns: false on failure
295 bool first_open_device(DCR *dcr)
297 DEVICE *dev = dcr->dev;
300 Dmsg0(120, "start open_output_device()\n");
307 /* Defer opening files */
308 if (!dev->is_tape()) {
309 Dmsg0(129, "Device is file, deferring open.\n");
313 Dmsg0(129, "Opening device.\n");
314 if (!dev->open_device(dcr, OPEN_READ_ONLY)) {
315 Jmsg1(NULL, M_FATAL, 0, _("dev open failed: %s\n"), dev->errmsg);
319 Dmsg1(129, "open dev %s OK\n", dev->print_name());