3 * Higher Level Device routines.
4 * Knows about Bacula tape labels and such
6 * NOTE! In general, subroutines that have the word
7 * "device" in the name do locking. Subroutines
8 * that have the word "dev" in the name do not
9 * do locking. Thus if xxx_device() calls
10 * yyy_dev(), all is OK, but if xxx_device()
11 * calls yyy_device(), everything will hang.
12 * Obviously, no zzz_dev() is allowed to call
13 * a www_device() or everything falls apart.
15 * Concerning the routines lock_device() and block_device()
16 * see the end of this module for details. In general,
17 * blocking a device leaves it in a state where all threads
18 * other than the current thread block when they attempt to
19 * lock the device. They remain suspended (blocked) until the device
20 * is unblocked. So, a device is blocked during an operation
21 * that takes a long time (initialization, mounting a new
22 * volume, ...) locking a device is done for an operation
23 * that takes a short time such as writing data to the
27 * Kern Sibbald, MM, MMI
32 Copyright (C) 2000-2003 Kern Sibbald and John Walker
34 This program is free software; you can redistribute it and/or
35 modify it under the terms of the GNU General Public License as
36 published by the Free Software Foundation; either version 2 of
37 the License, or (at your option) any later version.
39 This program is distributed in the hope that it will be useful,
40 but WITHOUT ANY WARRANTY; without even the implied warranty of
41 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
42 General Public License for more details.
44 You should have received a copy of the GNU General Public
45 License along with this program; if not, write to the Free
46 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
51 #include "bacula.h" /* pull in global headers */
52 #include "stored.h" /* pull in Storage Deamon headers */
54 /* Forward referenced functions */
56 extern char my_name[];
57 extern int debug_level;
60 * This is the dreaded moment. We either have an end of
61 * medium condition or worse, and error condition.
62 * Attempt to "recover" by obtaining a new Volume.
64 * We enter with device locked, and
65 * exit with device locked.
67 * Note, we are called only from one place in block.c
69 * Returns: 1 on success
72 int fixup_device_block_write_error(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
75 char PrevVolName[MAX_NAME_LENGTH];
80 wait_time = time(NULL);
81 status_dev(dev, &stat);
82 if (!(stat & BMT_EOD)) {
83 return 0; /* this really shouldn't happen */
86 Dmsg0(100, "======= Got EOD ========\n");
88 block_device(dev, BST_DOING_ACQUIRE);
89 /* Unlock, but leave BLOCKED */
93 * Walk through all attached jcrs creating a jobmedia_record()
95 Dmsg1(100, "Walk attached jcrs. Volume=%s\n", dev->VolCatInfo.VolCatName);
96 for (JCR *mjcr=NULL; (mjcr=next_attached_jcr(dev, mjcr)); ) {
97 if (mjcr->JobId == 0) {
98 continue; /* ignore console */
100 Dmsg1(100, "create JobMedia for Job %s\n", mjcr->Job);
101 if (dev->state & ST_TAPE) {
102 mjcr->EndBlock = dev->EndBlock;
103 mjcr->EndFile = dev->EndFile;
104 Dmsg2(200, "Fixup EndFile=%u EndBlock=%u\n", mjcr->EndFile, mjcr->EndBlock);
106 mjcr->EndBlock = (uint32_t)dev->file_addr;
107 mjcr->EndFile = (uint32_t)(dev->file_addr >> 32);
109 if (!dir_create_jobmedia_record(mjcr)) {
110 Jmsg(mjcr, M_ERROR, 0, _("Could not create JobMedia record for Volume=%s Job=%s\n"),
111 dev->VolCatInfo.VolCatName, mjcr->Job);
116 mjcr->VolFirstIndex = 0; /* prevent writing jobmedia second time */
119 strcpy(dev->VolCatInfo.VolCatStatus, "Full");
120 Dmsg2(200, "Call update_vol_info Stat=%s Vol=%s\n",
121 dev->VolCatInfo.VolCatStatus, dev->VolCatInfo.VolCatName);
122 if (!dir_update_volume_info(jcr, &dev->VolCatInfo, 0)) { /* send Volume info to Director */
125 return 0; /* device locked */
127 Dmsg0(100, "Back from update_vol_info\n");
129 bstrncpy(PrevVolName, dev->VolCatInfo.VolCatName, sizeof(PrevVolName));
130 bstrncpy(dev->VolHdr.PrevVolName, PrevVolName, sizeof(dev->VolHdr.PrevVolName));
132 label_blk = new_block(dev);
134 /* Inform User about end of medium */
135 Jmsg(jcr, M_INFO, 0, _("End of medium on Volume \"%s\" Bytes=%s Blocks=%s.\n"),
136 PrevVolName, edit_uint64_with_commas(dev->VolCatInfo.VolCatBytes, b1),
137 edit_uint64_with_commas(dev->VolCatInfo.VolCatBlocks, b2));
139 if (!mount_next_write_volume(jcr, dev, label_blk, 1)) {
140 free_block(label_blk);
143 return 0; /* device locked */
145 P(dev->mutex); /* lock again */
147 Jmsg(jcr, M_INFO, 0, _("New volume \"%s\" mounted on device %s\n"),
148 jcr->VolumeName, dev_name(dev));
151 * If this is a new tape, the label_blk will contain the
152 * label, so write it now. If this is a previously
153 * used tape, mount_next_write_volume() will return an
154 * empty label_blk, and nothing will be written.
156 Dmsg0(190, "write label block to dev\n");
157 if (!write_block_to_dev(jcr, dev, label_blk)) {
158 Pmsg1(0, "write_block_to_device Volume label failed. ERR=%s",
160 free_block(label_blk);
162 return 0; /* device locked */
164 free_block(label_blk);
167 /* Update start block/file for overflow block */
169 for (JCR *mjcr=NULL; (mjcr=next_attached_jcr(dev, mjcr)); ) {
170 /* Set new start/end positions */
171 if (dev->state & ST_TAPE) {
172 mjcr->StartBlock = dev->block_num;
173 mjcr->StartFile = dev->file;
175 mjcr->StartBlock = (uint32_t)dev->file_addr;
176 mjcr->StartFile = (uint32_t)(dev->file_addr >> 32);
178 /* Set first FirstIndex for new Volume */
179 mjcr->VolFirstIndex = mjcr->JobFiles;
180 mjcr->run_time += time(NULL) - wait_time; /* correct run time */
183 /* Write overflow block to tape */
184 Dmsg0(190, "Write overflow block to dev\n");
185 if (!write_block_to_dev(jcr, dev, block)) {
186 Pmsg1(0, "write_block_to_device overflow block failed. ERR=%s",
189 return 0; /* device locked */
193 return 1; /* device locked */
198 * Open the device. Expect dev to already be initialized.
200 * This routine is used only when the Storage daemon starts
201 * and always_open is set, and in the stand-alone utility
202 * routines such as bextract.
204 * Note, opening of a normal file is deferred to later so
205 * that we can get the filename; the device_name for
206 * a file is the directory only.
208 * Retuns: 0 on failure
211 int open_device(DEVICE *dev)
213 Dmsg0(120, "start open_output_device()\n");
220 /* Defer opening files */
221 if (!dev_is_tape(dev)) {
222 Dmsg0(129, "Device is file, deferring open.\n");
227 if (!(dev->state & ST_OPENED)) {
228 Dmsg0(129, "Opening device.\n");
229 if (open_dev(dev, NULL, READ_WRITE) < 0) {
230 Emsg1(M_FATAL, 0, _("dev open failed: %s\n"), dev->errmsg);
235 Dmsg1(129, "open_dev %s OK\n", dev_name(dev));
242 * When dev_blocked is set, all threads EXCEPT thread with id no_wait_id
243 * must wait. The no_wait_id thread is out obtaining a new volume
244 * and preparing the label.
246 void _lock_device(char *file, int line, DEVICE *dev)
249 Dmsg3(100, "lock %d from %s:%d\n", dev->dev_blocked, file, line);
251 if (dev->dev_blocked && !pthread_equal(dev->no_wait_id, pthread_self())) {
252 dev->num_waiting++; /* indicate that I am waiting */
253 while (dev->dev_blocked) {
254 if ((stat = pthread_cond_wait(&dev->wait, &dev->mutex)) != 0) {
256 Emsg1(M_ABORT, 0, _("pthread_cond_wait failure. ERR=%s\n"),
260 dev->num_waiting--; /* no longer waiting */
264 void _unlock_device(char *file, int line, DEVICE *dev)
266 Dmsg2(100, "unlock from %s:%d\n", file, line);
271 * Block all other threads from using the device
272 * Device must already be locked. After this call,
273 * the device is blocked to any thread calling lock_device(),
274 * but the device is not locked (i.e. no P on device). Also,
275 * the current thread can do slip through the lock_device()
276 * calls without blocking.
278 void _block_device(char *file, int line, DEVICE *dev, int state)
280 Dmsg3(100, "block set %d from %s:%d\n", state, file, line);
281 ASSERT(dev->dev_blocked == BST_NOT_BLOCKED);
282 dev->dev_blocked = state; /* make other threads wait */
283 dev->no_wait_id = pthread_self(); /* allow us to continue */
289 * Unblock the device, and wake up anyone who went to sleep.
291 void _unblock_device(char *file, int line, DEVICE *dev)
293 Dmsg3(100, "unblock %d from %s:%d\n", dev->dev_blocked, file, line);
294 ASSERT(dev->dev_blocked);
295 dev->dev_blocked = BST_NOT_BLOCKED;
297 if (dev->num_waiting > 0) {
298 pthread_cond_broadcast(&dev->wait); /* wake them up */
303 * Enter with device locked and blocked
304 * Exit with device unlocked and blocked by us.
306 void _steal_device_lock(char *file, int line, DEVICE *dev, bsteal_lock_t *hold, int state)
308 Dmsg4(100, "steal lock. old=%d new=%d from %s:%d\n", dev->dev_blocked, state,
310 hold->dev_blocked = dev->dev_blocked;
311 hold->no_wait_id = dev->no_wait_id;
312 dev->dev_blocked = state;
313 dev->no_wait_id = pthread_self();
318 * Enter with device blocked by us but not locked
319 * Exit with device locked, and blocked by previous owner
321 void _give_back_device_lock(char *file, int line, DEVICE *dev, bsteal_lock_t *hold)
323 Dmsg4(100, "return lock. old=%d new=%d from %s:%d\n",
324 dev->dev_blocked, hold->dev_blocked, file, line);
326 dev->dev_blocked = hold->dev_blocked;
327 dev->no_wait_id = hold->no_wait_id;