2 Bacula® - The Network Backup Solution
4 Copyright (C) 2000-2008 Free Software Foundation Europe e.V.
6 The main author of Bacula is Kern Sibbald, with contributions from
7 many others, a complete list can be found in the file AUTHORS.
8 This program is Free Software; you can redistribute it and/or
9 modify it under the terms of version two of the GNU General Public
10 License as published by the Free Software Foundation and included
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 Bacula® is a registered trademark of Kern Sibbald.
24 The licensor of Bacula is the Free Software Foundation Europe
25 (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
26 Switzerland, email:ftf@fsfeurope.org.
29 * Definitions for using the Device functions in Bacula
30 * Tape and File storage access
39 * Some details of how volume and device reservations work
42 * set_in_use() volume being used on current drive
43 * clear_in_use() no longer being used. Can be re-used or moved.
44 * set_swapping() set volume being moved to another drive
45 * is_swapping() volume is being moved to another drive
46 * clear_swapping() volume normal
49 * set_load() set to load volume
50 * needs_load() volume must be loaded (i.e. set_load done)
51 * clear_load() load done.
52 * set_unload() set to unload volume
53 * needs_unload() volume must be unloaded
54 * clear_unload() volume unloaded
56 * reservations are temporary until the drive is acquired
57 * inc_reserved() increments num of reservations
58 * dec_reserved() decrements num of reservations
59 * num_reserved() number of reservations
62 * set_reserved() sets local reserve flag and calls dev->inc_reserved()
63 * clear_reserved() clears local reserve flag and calls dev->dec_reserved()
64 * is_reserved() returns local reserved flag
65 * unreserve_device() much more complete unreservation
73 #undef DCR /* used by Bacula */
75 /* Return values from wait_for_sysop() */
84 /* Arguments to open_dev() */
86 CREATE_READ_WRITE = 1,
98 B_VTAPE_DEV, /* change to B_TAPE_DEV after init */
102 /* Generic status bits returned from status_dev() */
103 #define BMT_TAPE (1<<0) /* is tape device */
104 #define BMT_EOF (1<<1) /* just read EOF */
105 #define BMT_BOT (1<<2) /* at beginning of tape */
106 #define BMT_EOT (1<<3) /* end of tape reached */
107 #define BMT_SM (1<<4) /* DDS setmark */
108 #define BMT_EOD (1<<5) /* DDS at end of data */
109 #define BMT_WR_PROT (1<<6) /* tape write protected */
110 #define BMT_ONLINE (1<<7) /* tape online */
111 #define BMT_DR_OPEN (1<<8) /* tape door open */
112 #define BMT_IM_REP_EN (1<<9) /* immediate report enabled */
115 /* Bits for device capabilities */
116 #define CAP_EOF (1<<0) /* has MTWEOF */
117 #define CAP_BSR (1<<1) /* has MTBSR */
118 #define CAP_BSF (1<<2) /* has MTBSF */
119 #define CAP_FSR (1<<3) /* has MTFSR */
120 #define CAP_FSF (1<<4) /* has MTFSF */
121 #define CAP_EOM (1<<5) /* has MTEOM */
122 #define CAP_REM (1<<6) /* is removable media */
123 #define CAP_RACCESS (1<<7) /* is random access device */
124 #define CAP_AUTOMOUNT (1<<8) /* Read device at start to see what is there */
125 #define CAP_LABEL (1<<9) /* Label blank tapes */
126 #define CAP_ANONVOLS (1<<10) /* Mount without knowing volume name */
127 #define CAP_ALWAYSOPEN (1<<11) /* always keep device open */
128 #define CAP_AUTOCHANGER (1<<12) /* AutoChanger */
129 #define CAP_OFFLINEUNMOUNT (1<<13) /* Offline before unmount */
130 #define CAP_STREAM (1<<14) /* Stream device */
131 #define CAP_BSFATEOM (1<<15) /* Backspace file at EOM */
132 #define CAP_FASTFSF (1<<16) /* Fast forward space file */
133 #define CAP_TWOEOF (1<<17) /* Write two eofs for EOM */
134 #define CAP_CLOSEONPOLL (1<<18) /* Close device on polling */
135 #define CAP_POSITIONBLOCKS (1<<19) /* Use block positioning */
136 #define CAP_MTIOCGET (1<<20) /* Basic support for fileno and blkno */
137 #define CAP_REQMOUNT (1<<21) /* Require mount to read files back (typically: DVD) */
138 #define CAP_CHECKLABELS (1<<22) /* Check for ANSI/IBM labels */
141 #define dev_state(dev, st_state) ((dev)->state & (st_state))
143 /* Device state bits */
144 #define ST_XXXXXX (1<<0) /* was ST_OPENED */
145 #define ST_XXXXX (1<<1) /* was ST_TAPE */
146 #define ST_XXXX (1<<2) /* was ST_FILE */
147 #define ST_XXX (1<<3) /* was ST_FIFO */
148 #define ST_XX (1<<4) /* was ST_DVD */
149 #define ST_X (1<<5) /* was ST_PROG */
151 #define ST_LABEL (1<<6) /* label found */
152 #define ST_MALLOC (1<<7) /* dev packet malloc'ed in init_dev() */
153 #define ST_APPEND (1<<8) /* ready for Bacula append */
154 #define ST_READ (1<<9) /* ready for Bacula read */
155 #define ST_EOT (1<<10) /* at end of tape */
156 #define ST_WEOT (1<<11) /* Got EOT on write */
157 #define ST_EOF (1<<12) /* Read EOF i.e. zero bytes */
158 #define ST_NEXTVOL (1<<13) /* Start writing on next volume */
159 #define ST_SHORT (1<<14) /* Short block read */
160 #define ST_MOUNTED (1<<15) /* the device is mounted to the mount point */
161 #define ST_MEDIA (1<<16) /* Media found in mounted device */
162 #define ST_OFFLINE (1<<17) /* set offline by operator */
163 #define ST_PART_SPOOLED (1<<18) /* spooling part */
164 #define ST_FREESPACE_OK (1<<19) /* Have valid freespace for DVD */
167 /* Volume Catalog Information structure definition */
168 struct VOLUME_CAT_INFO {
169 /* Media info for the current Volume */
170 uint32_t VolCatJobs; /* number of jobs on this Volume */
171 uint32_t VolCatFiles; /* Number of files */
172 uint32_t VolCatBlocks; /* Number of blocks */
173 uint64_t VolCatBytes; /* Number of bytes written */
174 uint32_t VolCatParts; /* Number of parts written */
175 uint32_t VolCatMounts; /* Number of mounts this volume */
176 uint32_t VolCatErrors; /* Number of errors this volume */
177 uint32_t VolCatWrites; /* Number of writes this volume */
178 uint32_t VolCatReads; /* Number of reads this volume */
179 uint64_t VolCatRBytes; /* Number of bytes read */
180 uint32_t VolCatRecycles; /* Number of recycles this volume */
181 uint32_t EndFile; /* Last file number */
182 uint32_t EndBlock; /* Last block number */
183 int32_t LabelType; /* Bacula/ANSI/IBM */
184 int32_t Slot; /* >0=Slot loaded, 0=nothing, -1=unknown */
185 uint32_t VolCatMaxJobs; /* Maximum Jobs to write to volume */
186 uint32_t VolCatMaxFiles; /* Maximum files to write to volume */
187 uint64_t VolCatMaxBytes; /* Max bytes to write to volume */
188 uint64_t VolCatCapacityBytes; /* capacity estimate */
189 btime_t VolReadTime; /* time spent reading */
190 btime_t VolWriteTime; /* time spent writing this Volume */
191 int64_t VolMediaId; /* MediaId */
192 utime_t VolFirstWritten; /* Time of first write */
193 utime_t VolLastWritten; /* Time of last write */
194 bool InChanger; /* Set if vol in current magazine */
195 char VolCatStatus[20]; /* Volume status */
196 char VolCatName[MAX_NAME_LENGTH]; /* Desired volume to mount */
200 class DEVRES; /* Device resource defined in stored_conf.h */
201 class DCR; /* forward reference */
202 class VOLRES; /* forward reference */
205 * Device structure definition. There is one of these for
206 * each physical device. Everything here is "global" to
207 * that device and effects all jobs using the device.
211 int m_fd; /* file descriptor */
212 int m_blocked; /* set if we must wait (i.e. change tape) */
213 int m_count; /* Mutex use count -- DEBUG only */
214 pthread_t m_pid; /* Thread that locked -- DEBUG only */
215 bool m_unload; /* set when Volume must be unloaded */
216 bool m_load; /* set when Volume must be loaded */
217 int m_num_reserved; /* counter of device reservations */
218 int32_t m_slot; /* slot loaded in drive or -1 if none */
221 DEVICE * volatile swap_dev; /* Swap vol from this device */
222 dlist *attached_dcrs; /* attached DCR list */
223 pthread_mutex_t m_mutex; /* access control */
224 pthread_mutex_t spool_mutex; /* mutex for updating spool_size */
225 pthread_cond_t wait; /* thread wait variable */
226 pthread_cond_t wait_next_vol; /* wait for tape to be mounted */
227 pthread_t no_wait_id; /* this thread must not wait */
228 int dev_prev_blocked; /* previous blocked state */
229 int num_waiting; /* number of threads waiting */
230 int num_writers; /* number of writing threads */
231 int capabilities; /* capabilities mask */
232 int state; /* state mask */
233 int dev_errno; /* Our own errno */
234 int mode; /* read/write modes */
235 int openmode; /* parameter passed to open_dev (useful to reopen the device) */
236 int dev_type; /* device type */
237 bool autoselect; /* Autoselect in autochanger */
238 bool initiated; /* set when init_dev() called */
239 int label_type; /* Bacula/ANSI/IBM label types */
240 uint32_t drive_index; /* Autochanger drive index (base 0) */
241 POOLMEM *dev_name; /* Physical device name */
242 POOLMEM *prt_name; /* Name used for display purposes */
243 char *errmsg; /* nicely edited error message */
244 uint32_t block_num; /* current block number base 0 */
245 uint32_t LastBlock; /* last DEV_BLOCK number written to Volume */
246 uint32_t file; /* current file number base 0 */
247 uint64_t file_addr; /* Current file read/write address */
248 uint64_t file_size; /* Current file size */
249 uint32_t EndBlock; /* last block written */
250 uint32_t EndFile; /* last file written */
251 uint32_t min_block_size; /* min block size */
252 uint32_t max_block_size; /* max block size */
253 uint64_t max_volume_size; /* max bytes to put on one volume */
254 uint64_t max_file_size; /* max file size to put in one file on volume */
255 uint64_t volume_capacity; /* advisory capacity */
256 uint64_t max_spool_size; /* maximum spool file size */
257 uint64_t spool_size; /* current spool size for this device */
258 uint32_t max_rewind_wait; /* max secs to allow for rewind */
259 uint32_t max_open_wait; /* max secs to allow for open */
260 uint32_t max_open_vols; /* max simultaneous open volumes */
262 uint64_t max_part_size; /* max part size */
263 uint64_t part_size; /* current part size */
264 uint32_t part; /* current part number (starts at 0) */
265 uint64_t part_start; /* current part start address (relative to the whole volume) */
266 uint32_t num_dvd_parts; /* number of parts WRITTEN on the DVD */
267 /* state ST_FREESPACE_OK is set if free_space is valid */
268 uint64_t free_space; /* current free space on medium (without the current part) */
269 int free_space_errno; /* indicates errno getting freespace */
270 bool truncating; /* if set, we are currently truncating the DVD */
271 bool blank_dvd; /* if set, we have a blank DVD in the drive */
274 utime_t vol_poll_interval; /* interval between polling Vol mount */
275 DEVRES *device; /* pointer to Device Resource */
276 VOLRES *vol; /* Pointer to Volume reservation item */
277 btimer_t *tid; /* timer id */
279 VOLUME_CAT_INFO VolCatInfo; /* Volume Catalog Information */
280 VOLUME_LABEL VolHdr; /* Actual volume label */
281 char pool_name[MAX_NAME_LENGTH]; /* pool name */
282 char pool_type[MAX_NAME_LENGTH]; /* pool type */
284 char UnloadVolName[MAX_NAME_LENGTH]; /* Last wrong Volume mounted */
285 bool poll; /* set to poll Volume */
286 /* Device wait times ***FIXME*** look at durations */
294 btime_t last_timer; /* used by read/write/seek to get stats (usec) */
295 btime_t last_tick; /* contains last read/write time (usec) */
298 btime_t DevWriteTime;
299 uint64_t DevWriteBytes;
300 uint64_t DevReadBytes;
303 btime_t get_timer_count(); /* return the last timer interval (ms) */
305 int has_cap(int cap) const { return capabilities & cap; }
306 void clear_cap(int cap) { capabilities &= ~cap; }
307 void set_cap(int cap) { capabilities |= cap; }
308 int is_autochanger() const { return capabilities & CAP_AUTOCHANGER; }
309 int requires_mount() const { return capabilities & CAP_REQMOUNT; }
310 int is_removable() const { return capabilities & CAP_REM; }
311 int is_tape() const { return (dev_type == B_TAPE_DEV ||
312 dev_type == B_VTAPE_DEV); }
313 int is_file() const { return dev_type == B_FILE_DEV; }
314 int is_fifo() const { return dev_type == B_FIFO_DEV; }
315 int is_dvd() const { return dev_type == B_DVD_DEV; }
316 int is_vtl() const { return dev_type == B_VTL_DEV; }
317 int is_vtape() const { return dev_type == B_VTAPE_DEV; }
318 int is_open() const { return m_fd >= 0; }
319 int is_offline() const { return state & ST_OFFLINE; }
320 int is_labeled() const { return state & ST_LABEL; }
321 int is_mounted() const { return state & ST_MOUNTED; }
322 int is_unmountable() const { return (is_dvd() || (is_file() && is_removable())); }
323 int num_reserved() const { return m_num_reserved; };
324 int is_part_spooled() const { return state & ST_PART_SPOOLED; }
325 int have_media() const { return state & ST_MEDIA; }
326 int is_short_block() const { return state & ST_SHORT; }
327 int is_busy() const { return (state & ST_READ) || num_writers || num_reserved(); }
328 int at_eof() const { return state & ST_EOF; }
329 int at_eot() const { return state & ST_EOT; }
330 int at_weot() const { return state & ST_WEOT; }
331 int can_append() const { return state & ST_APPEND; }
332 int is_freespace_ok() const { return state & ST_FREESPACE_OK; }
334 * can_write() is meant for checking at the end of a job to see
335 * if we still have a tape (perhaps not if at end of tape
336 * and the job is canceled).
338 int can_write() const { return is_open() && can_append() &&
339 is_labeled() && !at_weot(); }
340 int can_read() const { return state & ST_READ; }
341 bool can_steal_lock() const { return m_blocked &&
342 (m_blocked == BST_UNMOUNTED ||
343 m_blocked == BST_WAITING_FOR_SYSOP ||
344 m_blocked == BST_UNMOUNTED_WAITING_FOR_SYSOP); };
345 bool waiting_for_mount() const { return
346 (m_blocked == BST_UNMOUNTED ||
347 m_blocked == BST_WAITING_FOR_SYSOP ||
348 m_blocked == BST_UNMOUNTED_WAITING_FOR_SYSOP); };
349 bool must_unload() const { return m_unload; };
350 bool must_load() const { return m_load; };
351 const char *strerror() const;
352 const char *archive_name() const;
353 const char *name() const;
354 const char *print_name() const; /* Name for display purposes */
355 void set_ateof(); /* in dev.c */
356 void set_ateot(); /* in dev.c */
357 void set_eot() { state |= ST_EOT; };
358 void set_eof() { state |= ST_EOF; };
359 void set_append() { state |= ST_APPEND; };
360 void set_labeled() { state |= ST_LABEL; };
361 inline void set_read() { state |= ST_READ; };
362 void set_offline() { state |= ST_OFFLINE; };
363 void set_mounted() { state |= ST_MOUNTED; };
364 void set_media() { state |= ST_MEDIA; };
365 void set_short_block() { state |= ST_SHORT; };
366 void set_freespace_ok() { state |= ST_FREESPACE_OK; }
367 void set_part_spooled(int val) { if (val) state |= ST_PART_SPOOLED; \
368 else state &= ~ST_PART_SPOOLED;
370 bool is_volume_to_unload() const { \
371 return m_unload && strcmp(VolHdr.VolumeName, UnloadVolName) == 0; };
372 void set_load() { m_load = true; };
373 void inc_reserved() { m_num_reserved++; }
374 void set_mounted(int val) { if (val) state |= ST_MOUNTED; \
375 else state &= ~ST_MOUNTED; };
376 void dec_reserved() { m_num_reserved--; ASSERT(m_num_reserved>=0); };
377 void clear_append() { state &= ~ST_APPEND; };
378 void clear_read() { state &= ~ST_READ; };
379 void clear_labeled() { state &= ~ST_LABEL; };
380 void clear_offline() { state &= ~ST_OFFLINE; };
381 void clear_eot() { state &= ~ST_EOT; };
382 void clear_eof() { state &= ~ST_EOF; };
383 void clear_opened() { m_fd = -1; };
384 void clear_mounted() { state &= ~ST_MOUNTED; };
385 void clear_media() { state &= ~ST_MEDIA; };
386 void clear_short_block() { state &= ~ST_SHORT; };
387 void clear_freespace_ok() { state &= ~ST_FREESPACE_OK; };
388 void clear_unload() { m_unload = false; UnloadVolName[0] = 0; };
389 void clear_load() { m_load = false; };
390 char *bstrerror(void) { return errmsg; };
391 char *print_errmsg() { return errmsg; };
392 int32_t get_slot() const { return m_slot; };
394 void set_unload(); /* in dev.c */
395 void clear_volhdr(); /* in dev.c */
396 void close(); /* in dev.c */
397 void close_part(DCR *dcr); /* in dev.c */
398 bool truncate(DCR *dcr); /* in dev.c */
399 int open(DCR *dcr, int mode); /* in dev.c */
400 void term(void); /* in dev.c */
401 ssize_t read(void *buf, size_t len); /* in dev.c */
402 ssize_t write(const void *buf, size_t len); /* in dev.c */
403 bool rewind(DCR *dcr); /* in dev.c */
404 bool mount(int timeout); /* in dev.c */
405 bool unmount(int timeout); /* in dev.c */
406 void edit_mount_codes(POOL_MEM &omsg, const char *imsg); /* in dev.c */
407 bool offline_or_rewind(); /* in dev.c */
408 bool offline(); /* in dev.c */
409 bool bsf(int count); /* in dev.c */
410 bool eod(DCR *dcr); /* in dev.c */
411 bool fsr(int num); /* in dev.c */
412 bool fsf(int num); /* in dev.c */
413 bool bsr(int num); /* in dev.c */
414 bool weof(int num); /* in dev.c */
415 void lock_door(); /* in dev.c */
416 void unlock_door(); /* in dev.c */
417 int32_t get_os_tape_file(); /* in dev.c */
418 bool scan_dir_for_volume(DCR *dcr); /* in scan.c */
419 bool reposition(DCR *dcr, uint32_t rfile, uint32_t rblock); /* in dev.c */
420 void clrerror(int func); /* in dev.c */
421 boffset_t lseek(DCR *dcr, boffset_t offset, int whence); /* in dev.c */
422 bool update_pos(DCR *dcr); /* in dev.c */
423 void set_slot(int32_t slot); /* in dev.c */
424 void clear_slot(); /* in dev.c */
427 bool update_freespace(); /* in dvd.c */
429 uint32_t get_file() const { return file; };
430 uint32_t get_block_num() const { return block_num; };
431 int fd() const { return m_fd; };
433 /* low level operations */
435 int (*d_open)(const char *pathname, int flags, ...);
436 int (*d_close)(int fd);
437 int (*d_ioctl)(int fd, ioctl_req_t request, ...);
438 ssize_t (*d_read)(int fd, void *buffer, size_t count);
439 ssize_t (*d_write)(int fd, const void *buffer, size_t count);
442 * Locking and blocking calls
445 void _r_dlock(const char *, int); /* in lock.c */
446 void _r_dunlock(const char *, int); /* in lock.c */
447 void _dlock(const char *, int); /* in lock.c */
448 void _dunlock(const char *, int); /* in lock.c */
450 void r_dlock(); /* in lock.c */
451 void r_dunlock() { dunlock(); }
452 void dlock() { P(m_mutex); }
453 void dunlock() { V(m_mutex); }
455 void dblock(int why); /* in lock.c */
456 void dunblock(bool locked=false); /* in lock.c */
457 void set_blocked(int block) { m_blocked = block; };
458 int blocked() const { return m_blocked; };
459 bool is_blocked() const { return m_blocked != BST_NOT_BLOCKED; };
460 const char *print_blocked() const; /* in dev.c */
463 bool do_mount(int mount, int timeout); /* in dev.c */
464 void set_mode(int omode); /* in dev.c */
465 void open_tape_device(DCR *dcr, int omode); /* in dev.c */
466 void open_file_device(DCR *dcr, int omode); /* in dev.c */
467 void open_dvd_device(DCR *dcr, int omode); /* in dev.c */
470 inline const char *DEVICE::strerror() const { return errmsg; }
471 inline const char *DEVICE::archive_name() const { return dev_name; }
472 inline const char *DEVICE::print_name() const { return prt_name; }
475 * Device Context (or Control) Record.
476 * There is one of these records for each Job that is using
477 * the device. Items in this record are "local" to the Job and
478 * do not affect other Jobs. Note, a job can have multiple
479 * DCRs open, each pointing to a different device.
483 bool m_dev_locked; /* set if dev already locked */
484 bool m_reserved; /* set if reserved device */
485 bool m_found_in_use; /* set if a volume found in use */
488 dlink dev_link; /* link to attach to dev */
489 JCR *jcr; /* pointer to JCR */
490 DEVICE * volatile dev; /* pointer to device */
491 DEVRES *device; /* pointer to device resource */
492 DEV_BLOCK *block; /* pointer to block */
493 DEV_RECORD *rec; /* pointer to record */
494 pthread_t tid; /* Thread running this dcr */
495 int spool_fd; /* fd if spooling */
496 bool spool_data; /* set to spool data */
497 bool spooling; /* set when actually spooling */
498 bool despooling; /* set when despooling */
499 bool despool_wait; /* waiting for despooling */
500 bool NewVol; /* set if new Volume mounted */
501 bool WroteVol; /* set if Volume written */
502 bool NewFile; /* set when EOF written */
503 bool reserved_volume; /* set if we reserved a volume */
504 bool any_volume; /* Any OK for dir_find_next... */
505 bool attached_to_dev; /* set when attached to dev */
506 bool keep_dcr; /* do not free dcr in release_dcr */
507 uint32_t VolFirstIndex; /* First file index this Volume */
508 uint32_t VolLastIndex; /* Last file index this Volume */
509 uint32_t FileIndex; /* Current File Index */
510 uint32_t EndFile; /* End file written */
511 uint32_t StartFile; /* Start write file */
512 uint32_t StartBlock; /* Start write block */
513 uint32_t EndBlock; /* Ending block written */
514 int64_t VolMediaId; /* MediaId */
515 int64_t job_spool_size; /* Current job spool size */
516 int64_t max_job_spool_size; /* Max job spool size */
517 char VolumeName[MAX_NAME_LENGTH]; /* Volume name */
518 char pool_name[MAX_NAME_LENGTH]; /* pool name */
519 char pool_type[MAX_NAME_LENGTH]; /* pool type */
520 char media_type[MAX_NAME_LENGTH]; /* media type */
521 char dev_name[MAX_NAME_LENGTH]; /* dev name */
522 int Copy; /* identical copy number */
523 int Stripe; /* RAIT stripe */
524 VOLUME_CAT_INFO VolCatInfo; /* Catalog info for desired volume */
527 bool found_in_use() const { return m_found_in_use; };
528 void set_found_in_use() { m_found_in_use = true; };
529 void clear_found_in_use() { m_found_in_use = false; };
530 bool is_reserved() const { return m_reserved; };
531 bool is_dev_locked() { return m_dev_locked; }
532 void dlock() { dev->dlock(); m_dev_locked = true; }
533 void dunlock() { m_dev_locked = false; dev->dunlock(); }
534 void dblock(int why) { dev->dblock(why); }
537 /* Methods in reserve.c */
538 void clear_reserved();
540 void unreserve_device();
542 /* Methods in vol_mgr.c */
543 bool can_i_use_volume();
544 bool can_i_write_volume();
546 /* Methods in mount.c */
547 bool mount_next_write_volume();
548 bool mount_next_read_volume();
549 void mark_volume_in_error();
550 void mark_volume_not_inchanger();
551 int try_autolabel(bool opened);
552 bool find_a_volume();
553 bool is_suitable_volume_mounted();
555 int check_volume_label(bool &ask, bool &autochanger);
556 void release_volume();
557 void do_swapping(bool is_writing);
559 bool do_load(bool is_writing);
560 bool is_tape_position_ok();
564 * Volume reservation class -- see reserve.c
567 bool m_swapping; /* set when swapping to another drive */
568 bool m_in_use; /* set when volume reserved or in use */
569 int32_t m_slot; /* slot of swapping volume */
570 uint32_t m_JobId; /* JobId for read volumes */
573 char *vol_name; /* Volume name */
574 DEVICE *dev; /* Pointer to device to which we are attached */
576 bool is_swapping() const { return m_swapping; };
577 void set_swapping() { m_swapping = true; };
578 void clear_swapping() { m_swapping = false; };
579 bool is_in_use() const { return m_in_use; };
580 void set_in_use() { m_in_use = true; };
581 void clear_in_use() { m_in_use = false; };
582 void set_slot(int32_t slot) { m_slot = slot; };
583 void clear_slot() { m_slot = -1; };
584 int32_t get_slot() const { return m_slot; };
585 uint32_t get_jobid() const { return m_JobId; };
586 void set_jobid(uint32_t JobId) { m_JobId = JobId; };
590 /* Get some definition of function to position
591 * to the end of the medium in MTEOM. System
592 * dependent. Arrgggg!