1 # Copyright (c) 2009, 2010 Zmanda, Inc. All Rights Reserved.
3 # This library is free software; you can redistribute it and/or modify it
4 # under the terms of the GNU Lesser General Public License version 2.1 as
5 # published by the Free Software Foundation.
7 # This library is distributed in the hope that it will be useful, but
8 # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
9 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
10 # License for more details.
12 # You should have received a copy of the GNU Lesser General Public License
13 # along with this library; if not, write to the Free Software Foundation,
14 # Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
16 # Contact information: Zmanda Inc., 465 S. Mathilda Ave., Suite 300
17 # Sunnyvale, CA 94086, USA, or: http://www.zmanda.com
25 step start_scribe => sub {
26 my $scribe = Amanda::Taper::Scribe->new(
27 taperscan => $taperscan_algo,
28 feedback => $feedback_obj);
30 write_timestamp => $write_timestamp,
31 finished_cb => $steps->{'start_xfer'});
34 step start_xfer => sub {
36 my $xfer_dest = $scribe->get_xfer_dest(
38 max_memory => 64 * 1024,
39 can_cache_inform => 0,
40 part_size => 150 * 1024**2,
41 part_cache_type => 'disk',
42 part_cache_dir => "$tmpdir/splitbuffer",
43 part_cache_max_size => 20 * 1024**2);
44 # .. set up the rest of the transfer ..
46 my ($src, $msg, $xfer) = @_;
47 $scribe->handle_xmsg($src, $msg, $xfer);
48 # .. any other processing ..
50 # tell the scribe to start dumping via this transfer
54 dump_cb => $steps->{'dump_cb'});
59 # .. handle dump results ..
67 This package provides a high-level abstraction of Amanda's procedure for
68 writing dumpfiles to tape.
70 Amanda writes a sequence of dumpfiles to a sequence of volumes. The
71 volumes are supplied by a taperscan algorithm, which operates a changer
72 to find and load each volume. As dumpfiles are written to volumes and
73 those volumes fill up, the taperscan algorithm supplies additional
76 In order to reduce internal fragmentation within volumes, Amanda can "split"
77 dumpfiles into smaller pieces, so that the overall dumpfile can span multiple
78 volumes. Each "part" is written to the volume in sequence. If a device
79 encounters an error while writing a part, then that part is considered
80 "partial", and is rewritten from its beginning on the next volume. Some
81 devices can reliably indicate that they are full (EOM), and for these devices
82 parts are simply truncated, and the Scribe starts the next part on the next
85 To facilitate rewriting parts on devices which cannot indicate EOM, Amanda must
86 retain all of the data in a part, even after that data is written to the
87 volume. The Scribe provides several methods to support this: caching the part
88 in memory, caching the part in a special on-disk file, or relying on
89 pre-existing on-disk storage. The latter method is used when reading from
92 The details of efficiently splitting dumpfiles and rewriting parts are handled
93 by the low-level C<Amanda::Xfer::Dest::Taper> subclasses. The Scribe creates
94 an instance of the appropriate subclass and supplies it with volumes from an
95 C<Amanda::Taper::Scan> object. It calls a number of
96 C<Amanda::Taper::Scribe::Feedback> methods to indicate the status of the dump
97 process and to request permission for each additional volume.
99 =head1 OPERATING A SCRIBE
101 The C<Amanda::Taper::Scribe> constructor takes two arguments:
102 C<taperscan> and C<feedback>. The first specifies the taper scan
103 algorithm that the Scribe should use, and the second specifies the
104 C<Feedback> object that will receive notifications from the Scribe (see
107 my $scribe = Amanda::Taper::Scribe->new(
108 taperscan => $my_taperscan,
109 feedback => $my_feedback);
111 Once the object is in place, call its C<start> method.
113 =head2 START THE SCRIBE
115 Start the scribe's operation by calling its C<start> method. This will invoke
116 the taperscan algorithm and scan for a volume. The method takes two parameters:
119 write_timestamp => $ts,
120 finished_cb => $start_finished_cb);
122 The timestamp will be written to each volume written by the Scribe. The
123 C<finished_cb> will be called with a single argument - C<undef> or an error
124 message - when the Scribe is ready to start its first dump. The Scribe is
125 "ready" when it has found a device to which it can write, although it does not
126 request permission to overwrite that volume, nor start overwriting it, until
127 the first dump begins (that is, until the first call to C<start_dump>).
129 =head2 SET UP A TRANSFER
131 Once the Scribe is started, begin transferring a dumpfile. This is a
132 three-step process: first, get an C<Amanda::Xfer::Dest::Taper> object from the
133 Scribe, then start the transfer, and finally let the Scribe know that the
134 transfer has started. Note that the Scribe supplies and manages the transfer
135 destination, but the transfer itself remains the responsibility of the caller.
139 Call C<get_device> to get the first device the xfer will be working with.
141 $device = $scribe->get_device();
143 This method must be called after C<start> has completed.
145 =head3 Check device compatibily for the data path
147 Call C<check_data_path>, supplying the data_path requested by the user.
149 if (my $err = $scribe->check_data_path($data_path)) {
150 # handle error message
153 This method must be called after C<start> has completed and before
154 C<get_xfer_dest> is called. It returns C<undef> on success or an error message
155 if the supplied C<data_path> is incompatible with the device. This is mainly
156 used to detect when a DirectTCP dump is going to a non-DirectTCP device.
158 =head3 Get a Transfer Destination
160 Call C<get_xfer_dest> to get the transfer element, supplying information on how
161 the dump should be split:
163 $xdest = $scribe->get_xfer_dest(
164 allow_split => $allow_split,
165 max_memory => $max_memory,
166 # .. splitting parameters
169 This method must be called after C<start> has completed, and will always return
170 a transfer element immediately. The underlying C<Amanda::Xfer::Dest::Taper>
171 handles device streaming properly. It uses C<max_memory> bytes of memory for
174 The splitting parameters to C<get_xfer_dest> are:
180 this dle is allowed or not to split
184 the split part size to use, or 0 for no splitting
186 =item C<part_cache_type>
188 when caching, the kind of caching to perform ('disk', 'memory' or the default,
191 =item C<part_cache_dir>
193 the directory to use for disk caching
195 =item C<part_cache_max_size>
197 the maximum part size to use when caching
199 =item C<can_cache_inform>
201 true if the transfer source can call the destination's C<cache_inform> method
202 (e.g., C<Amanda::Xfer::Source::Holding>).
206 The first four of these parameters correspond exactly to the eponymous tapetype
207 configuration parameters, and have the same default values (when omitted or
208 C<undef>). The method will take this information, along with details of the
209 device it intends to use, and set up the transfer destination.
211 The utility function C<get_splitting_args_from_config> can determine the
212 appropriate C<get_xfer_dest> splitting parameters based on a
213 few Amanda configuration parameters. If a parameter was not seen in the
214 configuration, it should be omitted or passed as C<undef>. The function
215 returns a hash to pass to C<get_xfer_dest>, although that hash may have an
216 C<warning> key containing a message if there is a problem that the user
219 use Amanda::Taper::Scribe qw( get_splitting_args_from_config );
220 my %splitting_args = get_splitting_args_from_config(
221 # Amanda dumptype configuration parameters,
222 dle_allow_split => ..,
223 dle_tape_splitsize => ..,
224 dle_split_diskbuffer => ..,
225 dle_fallback_splitsize => ..,
226 dle_allow_split => ..,
227 # Amanda tapetype configuration parameters,
228 part_size => .., ## in bytes, not kb!!
229 part_size_kb => ..., ## or use this, in kb
230 part_cache_type => ..,
231 part_cache_type_enum => ..., ## one of the enums from tapetype_getconf
232 part_cache_dir => ..,
233 part_cache_max_size => ..,
235 if ($splitting_args{'error'}) { .. }
237 An C<Amanda::Taper::Scribe> object can only run one transfer at a time, so
238 do not call C<get_xfer_dest> until the C<dump_cb> for the previous C<start_dump>
241 =head3 Start the Transfer
243 Armed with the element returned by C<get_xfer_dest>, the caller should create a
244 source element and a transfer object and start the transfer. In order to
245 manage the splitting process, the Scribe needs to be informed, via its
246 C<handle_xmsg> method, of all transfer messages . This is usually accomplished
250 my ($src, $msg, $xfer) = @_;
251 $scribe->handle_xmsg($src, $msg, $xfer);
254 =head3 Inform the Scribe
256 Once the transfer has started, the Scribe is ready to begin writing parts to
257 the volume. This is the first moment at which the Scribe needs a header, too.
258 All of this is supplied to the C<start_dump> method:
263 dump_cb => $dump_cb);
265 The c<dump_header> here is the header that will be applied to all parts of the
266 dumpfile. The only field in the header that the Scribe controls is the part
267 number. The C<dump_cb> callback passed to C<start_dump> is called when the
268 dump is completely finished - either successfully or with a fatal error.
269 Unlike most callbacks, this one takes keyword arguments, since it has so many
274 device_errors => $device_errors,
275 config_denial_message => $cdm,
277 duration => $duration,
278 total_duration => $total_duration,
281 All parameters will be present on every call, although the order is not
284 The C<result> is one of C<"FAILED">, C<"PARTIAL">, or C<"DONE">. Even when
285 C<dump_cb> reports a fatal error, C<result> may be C<"PARTIAL"> if some data
286 was written successfully.
288 The C<device_error> key points to a list of errors, each given as a string,
289 that describe what went wrong to cause the dump to fail. The
290 C<config_denial_message> parrots the reason provided by C<$perm_cb> (see below)
291 for denying use of a new tape if the cause was 'config', and is C<undef>
294 The final parameters, C<size> (in bytes), C<duration>, C<total_duration> (in
295 seconds), and C<nparts> describe the total transfer, and are a sum of all of
296 the parts written to the device. Note that C<nparts> does not include any
297 empty trailing parts. Note that C<duration> does not include time spent
298 operating the changer, while C<total_duration> reflects the time from the
299 C<start_dump> call to the invocation of the C<dump_cb>.
301 =head3 Cancelling a Dump
303 After you have requested a transfer destination, the scribe is poised to begin the
304 transfer. If you cannot actually perform the transfer for some reason, you'll need
305 to go through the motions all the same, but cancel the operation immediately. That
306 can be done by calling C<cancel_dump>:
308 $scribe->cancel_dump(
310 dump_cb => $dump_cb);
314 When all of the dumpfiles are transferred, call the C<quit> method to
315 release any resources and clean up. This method takes a typical
318 $scribe->quit(finished_cb => sub {
322 =head2 GET_BYTES_WRITTEN
324 The C<get_bytes_written> returns the number of bytes written to the device at
325 the time of the call, and is meant to be used for status reporting. This value
326 is updated at least as each part is finished; for some modes of operation, it
327 is updated continuously. Notably, DirectTCP transfers do not update
332 The C<start_scan> method initiate a scan of the changer to find a usable tape.
336 The C<Amanda::Taper::Scribe::Feedback> class is intended to be
337 subclassed by the user. It provides a number of notification methods
338 that enable the historical logging and driver/taper interactions
339 required by Amanda. The parent class does nothing of interest, but
340 allows subclasses to omit methods they do not need.
342 The C<request_volume_permission> method provides a means for the caller
343 to limit the number of volumes the Scribe consumes. It is called as
345 $fb->request_volume_permission(perm_cb => $cb);
347 The C<perm_cb> is a callback which expects a hash as arguments. If C<allow>
348 is set, then the scribe is allowed to use a new volume, if C<scribe> is set,
349 then the xfer must be transfered to that scribe, otherwise a C<cause>
350 and a C<message> describing why a new volume should not be used. must be
353 perm_cb->(allow => 1);
354 perm_cb->(scribe => $new_scribe);
355 perm_cb->(cause => 'config', message => $message);
356 perm_cb->(cause => 'error', message => $message);
358 A cause of 'config' indicates that the denial is due to the user's
359 configuration, and thus should not be presented as an error. The default
360 implementation always calls C<< perm_cb->() >>.
362 All of the remaining methods are notifications, and do not take a
365 $fb->scribe_notif_new_tape(
367 volume_label => $volume_label);
369 The Scribe calls C<scribe_notif_new_tape> when a new volume is started. If the
370 C<volume_label> is undefined, then the volume was not successfully
371 relabled, and its previous contents may still be available. If C<error>
372 is defined, then no useful data was written to the volume. Note that
373 C<error> and C<volume_label> may I<both> be defined if the previous
374 contents of the volume were erased, but no useful, new data was written
377 This method will be called exactly once for every call to
378 C<request_volume_permission> that calls back with C<< perm_cb->() >>.
380 $fb->scribe_notif_tape_done(
381 volume_label => $volume_label,
383 num_files => $num_files);
385 The C<scribe_notif_tape_done> method is called after a volume is completely
386 written and its reservation has been released. Note that the scribe waits
387 until the last possible moment to release a reservation, so this may be called
388 later than expected, e.g., during a C<quit> invocation.
390 $fb->scribe_notif_part_done(
393 successful => $successful,
395 duration => $duration);
397 The Scribe calls C<scribe_notif_part_done> for each part written to the volume,
398 including partial parts. If the part was not written successfully, then
399 C<successful> is false. The C<size> is in bytes, and the C<duration> is
400 a floating-point number of seconds. If a part fails before a new device
401 file is created, then C<fileno> may be zero.
403 Finally, the Scribe sends a few historically significant trace log messages
404 via C<scribe_notif_log_info>:
406 $fb->scribe_notif_log_info(
407 message => $message);
409 A typical Feedback subclass might begin like this:
411 package main::Feedback;
412 use base 'Amanda::Taper::Scribe::Feedback';
414 sub request_volume_permission {
418 $params{'perm_cb'}->(cause => "error", message => "NO VOLUMES FOR YOU!");
423 package Amanda::Taper::Scribe;
429 use Amanda::Xfer qw( :constants );
430 use Amanda::Device qw( :constants );
432 use Amanda::Debug qw( :logging );
433 use Amanda::MainLoop;
434 use Amanda::Tapelist;
435 use Amanda::Config qw( :getconf config_dir_relative );
436 use base qw( Exporter );
438 our @EXPORT_OK = qw( get_splitting_args_from_config );
444 my $decide_debug = $Amanda::Config::debug_taper || $params{'debug'};
445 for my $rq_param (qw(taperscan feedback)) {
446 croak "required parameter '$rq_param' mising"
447 unless exists $params{$rq_param};
451 taperscan => $params{'taperscan'},
452 feedback => $params{'feedback'},
453 debug => $decide_debug,
454 eject_volume => $params{'eject_volume'},
455 write_timestamp => undef,
458 # device handling, and our current device and reservation
459 devhandling => Amanda::Taper::Scribe::DevHandling->new(
460 taperscan => $params{'taperscan'},
461 feedback => $params{'feedback'},
463 reservation => undef,
465 device_size => undef,
466 device_at_eom => undef, # device still exists, but is full
467 close_volume => undef,
469 # callback passed to start_dump
472 # information for the current dumpfile
473 dump_header => undef,
474 retry_part_on_peom => undef,
475 allow_split => undef,
479 start_part_on_xdt_ready => 0,
482 dump_start_time => undef,
483 last_part_successful => 0,
484 started_writing => 0,
486 config_denial_message => undef,
489 return bless ($self, $class);
496 for my $rq_param (qw(write_timestamp finished_cb)) {
497 croak "required parameter '$rq_param' missing"
498 unless exists $params{$rq_param};
501 die "scribe already started" if $self->{'started'};
503 $self->dbg("starting");
504 $self->{'write_timestamp'} = $params{'write_timestamp'};
506 # start up the DevHandling object, making sure we know
507 # when it's done with its startup process
508 $self->{'devhandling'}->start(finished_cb => sub {
509 $self->{'started'} = 1;
510 $params{'finished_cb'}->(@_);
518 # since there's little other option than to barrel on through the
519 # quitting procedure, quit() just accumulates its error messages
520 # and, if necessary, concantenates them for the finished_cb.
523 my $steps = define_steps
524 cb_ref => \$params{'finished_cb'};
527 $self->dbg("quitting");
529 if ($self->{'xfer'}) {
530 die "Scribe cannot quit while a transfer is active";
531 # Supporting this would be complicated:
532 # - cancel the xfer and wait for it to complete
533 # - ensure that the taperscan not be started afterward
534 # and isn't required for normal Amanda operation.
537 $steps->{'release'}->();
540 step release => sub {
541 if ($self->{'reservation'}) {
542 $self->_release_reservation(finished_cb => $steps->{'released'});
544 $steps->{'stop_devhandling'}->();
548 step released => sub {
550 push @errors, "$err" if $err;
552 $self->{'reservation'} = undef;
554 $steps->{'stop_devhandling'}->();
557 step stop_devhandling => sub {
558 $self->{'devhandling'}->quit(finished_cb => $steps->{'stopped_devhandling'});
561 step stopped_devhandling => sub {
563 push @errors, "$err" if $err;
565 my $errmsg = join("; ", @errors) if @errors >= 1;
566 $params{'finished_cb'}->($errmsg);
573 # Can return a device we already have, or "peek" at the
574 # DevHandling object's device.
575 # It might not have right permission on the device.
578 if (defined $self->{'device'}) {
579 $device = $self->{'device'};
581 $device = $self->{'devhandling'}->peek_device();
586 sub check_data_path {
588 my $data_path = shift;
590 my $device = $self->get_device();
592 if (!defined $device) {
593 die "no device is available to check the datapath";
596 my $use_directtcp = $device->directtcp_supported();
599 if (!$use_directtcp) {
600 if ($data_path eq 'DIRECTTCP') {
601 return "Can't dump DIRECTTCP data-path dle to a device ('" .
602 $device->device_name .
603 "') that doesn't support it";
612 $self->{'devhandling'}->start_scan();
615 # Get a transfer destination; does not use a callback
620 for my $rq_param (qw(max_memory)) {
621 croak "required parameter '$rq_param' missing"
622 unless exists $params{$rq_param};
625 die "not yet started"
626 unless $self->{'write_timestamp'} and $self->{'started'};
627 die "xfer element already returned"
629 die "xfer already running"
630 if ($self->{'xfer'});
632 $self->{'xfer'} = undef;
633 $self->{'xdt'} = undef;
635 $self->{'duration'} = 0.0;
636 $self->{'nparts'} = undef;
637 $self->{'dump_start_time'} = undef;
638 $self->{'last_part_successful'} = 1;
639 $self->{'started_writing'} = 0;
640 $self->{'device_errors'} = [];
641 $self->{'config_denial_message'} = undef;
644 $self->{'dump_cb'} = undef;
645 $self->{'retry_part_on_peom'} = 1;
646 $self->{'allow_split'} = 0;
647 $self->{'start_part_on_xdt_ready'} = 0;
649 # start getting parameters together to determine what kind of splitting
650 # and caching we're going to do
651 my $part_size = $params{'part_size'} || 0;
652 my ($use_mem_cache, $disk_cache_dirname) = (0, undef);
653 my $can_cache_inform = $params{'can_cache_inform'};
654 my $part_cache_type = $params{'part_cache_type'} || 'none';
655 my $allow_split = $params{'allow_split'};
657 my $xdt_first_dev = $self->get_device();
658 if (!defined $xdt_first_dev) {
659 die "no device is available to create an xfer_dest";
661 my $leom_supported = $xdt_first_dev->property_get("leom");
662 my $use_directtcp = $xdt_first_dev->directtcp_supported();
664 # figure out the destination type we'll use, based on the circumstances
665 my ($dest_type, $dest_text);
666 if ($use_directtcp) {
667 $dest_type = 'directtcp';
668 $dest_text = "using DirectTCP";
669 } elsif ($can_cache_inform && $leom_supported) {
670 $dest_type = 'splitter';
671 $dest_text = "using LEOM (falling back to holding disk as cache)";
672 } elsif ($leom_supported) {
673 $dest_type = 'splitter';
674 $dest_text = "using LEOM detection (no caching)";
675 } elsif ($can_cache_inform) {
676 $dest_type = 'splitter';
677 $dest_text = "using cache_inform";
678 } elsif ($part_cache_type ne 'none') {
679 $dest_type = 'cacher';
681 # we'll be caching, so apply the maximum size
682 my $part_cache_max_size = $params{'part_cache_max_size'} || 0;
683 $part_size = $part_cache_max_size
684 if ($part_cache_max_size and $part_cache_max_size < $part_size);
686 # and figure out what kind of caching to apply
687 if ($part_cache_type eq 'memory') {
690 # note that we assume this has already been checked; if it's wrong,
691 # the xfer element will just fail immediately
692 $disk_cache_dirname = $params{'part_cache_dir'};
694 $dest_text = "using cache type '$part_cache_type'";
696 $dest_type = 'splitter';
697 $dest_text = "using no cache (PEOM will be fatal)";
699 # no directtcp, no caching, no cache_inform, and no LEOM, so a PEOM will be fatal
700 $self->{'retry_part_on_peom'} = 0;
704 ($can_cache_inform ||
705 !defined($part_cache_type) ||
706 $part_cache_type eq 'disk' ||
707 $part_cache_type eq 'memory' ||
709 $self->{'allow_split'} = 1;
711 $self->{'allow_split'} = 0;
714 $self->{'retry_part_on_peom'} = 0 if !$self->{'allow_split'};
716 debug("Amanda::Taper::Scribe preparing to write, part size $part_size, "
717 . "$dest_text ($dest_type) "
718 . ($leom_supported? " (LEOM supported)" : " (no LEOM)"));
720 # set the device to verbose logging if we're in debug mode
721 if ($self->{'debug'}) {
722 $xdt_first_dev->property_set("verbose", 1);
726 if ($dest_type eq 'directtcp') {
727 $xdt = Amanda::Xfer::Dest::Taper::DirectTCP->new(
728 $xdt_first_dev, $part_size);
729 $self->{'xdt_ready'} = 0; # xdt isn't ready until we get XMSG_READY
730 } elsif ($dest_type eq 'splitter') {
731 $xdt = Amanda::Xfer::Dest::Taper::Splitter->new(
732 $xdt_first_dev, $params{'max_memory'}, $part_size, $can_cache_inform);
733 $self->{'xdt_ready'} = 1; # xdt is ready immediately
735 $xdt = Amanda::Xfer::Dest::Taper::Cacher->new(
736 $xdt_first_dev, $params{'max_memory'}, $part_size,
737 $use_mem_cache, $disk_cache_dirname);
738 $self->{'xdt_ready'} = 1; # xdt is ready immediately
740 $self->{'start_part_on_xdt_ready'} = 0;
741 $self->{'xdt'} = $xdt;
750 die "no xfer dest set up; call get_xfer_dest first"
751 unless defined $self->{'xdt'};
753 # get the header ready for writing (totalparts was set by the caller)
754 $self->{'dump_header'} = $params{'dump_header'};
755 $self->{'dump_header'}->{'partnum'} = 1;
757 # set up the dump_cb for when this dump is done, and keep the xfer
758 $self->{'dump_cb'} = $params{'dump_cb'};
759 $self->{'xfer'} = $params{'xfer'};
760 $self->{'dump_start_time'} = time;
763 $self->_start_part();
770 die "no xfer dest set up; call get_xfer_dest first"
771 unless defined $self->{'xdt'};
773 # set up the dump_cb for when this dump is done, and keep the xfer
774 $self->{'dump_cb'} = $params{'dump_cb'};
775 $self->{'xfer'} = $params{'xfer'};
777 # XXX The cancel should call dump_cb, but right now the xfer stays hung in
778 # accept. So we leave the xfer to its hang, and dump_cb is called and xdt
779 # and xfer are set to undef. This should be fixed in 3.2.
781 $self->{'xfer'}->cancel();
783 $self->{'dump_cb'}->(
786 config_denial_message => undef,
791 $self->{'xdt'} = undef;
792 $self->{'xfer'} = undef;
798 $self->{'close_volume'} = 1;
801 sub get_bytes_written {
804 if (defined $self->{'xdt'}) {
805 return $self->{'size'} + $self->{'xdt'}->get_part_bytes_written();
807 return $self->{'size'};
814 $self->dbg("trying to start part");
816 # if the xdt isn't ready yet, wait until it is; note that the XDT is still
817 # using the device right now, so we can't even label it yet.
818 if (!$self->{'xdt_ready'}) {
819 $self->dbg("XDT not ready yet; waiting until it is");
820 $self->{'start_part_on_xdt_ready'} = 1;
824 if ($self->{'close_volume'}) {
825 $self->{'close_volume'} = undef;
826 return $self->_get_new_volume();
829 # we need an actual, permitted device at this point, so if we don't have
830 # one, then defer this start_part call until we do. The device may still
831 # exist, but be at EOM, if the last dump failed at EOM and was not retried
833 if (!$self->{'device'} or $self->{'device_at_eom'}) {
834 # _get_new_volume calls _start_part when it has a new volume in hand
835 return $self->_get_new_volume();
838 # if the dump wasn't successful, and we're not splitting, then bail out. It's
839 # up to higher-level components to re-try this dump on a new volume, if desired.
840 # Note that this should be caught in the XMSG_PART_DONE handler -- this is just
842 if (!$self->{'last_part_successful'} and !$self->{'retry_part_on_peom'}) {
843 $self->_operation_failed(device_error => "No space left on device (uncaught)");
847 # and start writing this part
848 $self->{'started_writing'} = 1;
849 $self->dbg("resuming transfer");
850 $self->{'xdt'}->start_part(!$self->{'last_part_successful'},
851 $self->{'dump_header'});
856 my ($src, $msg, $xfer) = @_;
858 if ($msg->{'type'} == $XMSG_DONE) {
859 $self->_xmsg_done($src, $msg, $xfer);
863 # for anything else we only pay attention to messages from
865 if ($msg->{'elt'} == $self->{'xdt'}) {
866 $self->dbg("got msg from xfer dest: $msg");
867 if ($msg->{'type'} == $XMSG_PART_DONE) {
868 $self->_xmsg_part_done($src, $msg, $xfer);
869 } elsif ($msg->{'type'} == $XMSG_READY) {
870 $self->_xmsg_ready($src, $msg, $xfer);
871 } elsif ($msg->{'type'} == $XMSG_ERROR) {
872 $self->_xmsg_error($src, $msg, $xfer);
877 sub _xmsg_part_done {
879 my ($src, $msg, $xfer) = @_;
881 # this handles successful zero-byte parts as a special case - they
882 # are an implementation detail of the splitting done by the transfer
885 if ($msg->{'successful'} and $msg->{'size'} == 0) {
886 $self->dbg("not notifying for empty, successful part");
888 # double-check partnum
889 die "Part numbers do not match!"
890 unless ($self->{'dump_header'}->{'partnum'} == $msg->{'partnum'});
893 $self->{'feedback'}->scribe_notif_part_done(
894 partnum => $msg->{'partnum'},
895 fileno => $msg->{'fileno'},
896 successful => $msg->{'successful'},
897 size => $msg->{'size'},
898 duration => $msg->{'duration'});
900 # increment nparts here, so empty parts are not counted
901 $self->{'nparts'} = $msg->{'partnum'};
904 $self->{'last_part_successful'} = $msg->{'successful'};
906 if ($msg->{'successful'}) {
907 $self->{'device_size'} += $msg->{'size'};
908 $self->{'size'} += $msg->{'size'};
909 $self->{'duration'} += $msg->{'duration'};
912 if (!$msg->{'eof'}) {
913 # update the header for the next dumpfile, if this was a non-empty part
914 if ($msg->{'successful'} and $msg->{'size'} != 0) {
915 $self->{'dump_header'}->{'partnum'}++;
919 # if there's an error finishing the device, it's probably just carryover
920 # from the error the Xfer::Dest::Taper encountered while writing to the
921 # device, so we ignore it.
922 if (!$self->{'device'}->finish()) {
923 my $devname = $self->{'device'}->device_name;
924 my $errmsg = $self->{'device'}->error_or_status();
925 $self->dbg("ignoring error while finishing device '$devname': $errmsg");
928 # if the part failed..
929 if (!$msg->{'successful'} || !$self->{'allow_split'}) {
930 # if no caching was going on, then the dump has failed
931 if (!$self->{'retry_part_on_peom'}) {
932 # mark this device as at EOM, since we are not going to look
933 # for another one yet
934 $self->{'device_at_eom'} = 1;
936 my $msg = "No space left on device";
937 if ($self->{'device'}->status() != $DEVICE_STATUS_SUCCESS) {
938 $msg = $self->{'device'}->error_or_status();
940 $self->_operation_failed(device_error => "$msg, splitting not enabled");
944 # log a message for amreport
945 $self->{'feedback'}->scribe_notif_log_info(
946 message => "Will request retry of failed split part.");
949 # get a new volume, then go on to the next part
950 $self->_get_new_volume();
952 # if the part was unsuccessful, but the xfer dest has reason to believe
953 # this is not due to EOM, then the dump is done
954 if (!$msg->{'successful'}) {
955 if ($self->{'device'}->status() != $DEVICE_STATUS_SUCCESS) {
956 $msg = $self->{'device'}->error_or_status();
957 $self->_operation_failed(device_error => $msg);
959 $self->_operation_failed();
964 # no EOM -- go on to the next part
965 $self->_start_part();
972 my ($src, $msg, $xfer) = @_;
974 $self->dbg("XDT is ready");
975 $self->{'xdt_ready'} = 1;
976 if ($self->{'start_part_on_xdt_ready'}) {
977 $self->{'start_part_on_xdt_ready'} = 0;
978 $self->_start_part();
984 my ($src, $msg, $xfer) = @_;
986 # XMSG_ERROR from the XDT is always fatal
987 $self->_operation_failed(device_error => $msg->{'message'});
992 my ($src, $msg, $xfer) = @_;
994 if ($msg->{'type'} == $XMSG_DONE) {
995 $self->dbg("transfer is complete");
1005 # determine the correct final status - DONE if we're done, PARTIAL
1006 # if we've started writing to the volume, otherwise FAILED
1007 if (@{$self->{'device_errors'}} or $self->{'config_denial_message'} or
1008 !$self->{'last_part_successful'}) {
1009 $result = $self->{'started_writing'}? 'PARTIAL' : 'FAILED';
1014 my $dump_cb = $self->{'dump_cb'};
1015 my %dump_cb_args = (
1017 device_errors => $self->{'device_errors'},
1018 config_denial_message => $self->{'config_denial_message'},
1019 size => $self->{'size'},
1020 duration => $self->{'duration'},
1021 total_duration => time - $self->{'dump_start_time'},
1022 nparts => $self->{'nparts'});
1024 # reset everything and let the original caller know we're done
1025 $self->{'xfer'} = undef;
1026 $self->{'xdt'} = undef;
1027 $self->{'dump_header'} = undef;
1028 $self->{'dump_cb'} = undef;
1029 $self->{'size'} = 0;
1030 $self->{'duration'} = 0.0;
1031 $self->{'nparts'} = undef;
1032 $self->{'dump_start_time'} = undef;
1033 $self->{'device_errors'} = [];
1034 $self->{'config_denial_message'} = undef;
1036 # and call the callback
1037 $dump_cb->(%dump_cb_args);
1040 # keyword parameters are utilities to the caller: either specify
1041 # device_error to add to the device_errors list or config_denial_message
1042 # to set the corresponding key in $self.
1043 sub _operation_failed {
1047 my $error_message = $params{'device_error'}
1048 || $params{'config_denial_message'}
1050 $self->dbg("operation failed: $error_message");
1052 # tuck the message away as desired
1053 push @{$self->{'device_errors'}}, $params{'device_error'}
1054 if defined $params{'device_error'};
1055 $self->{'config_denial_message'} = $params{'config_denial_message'}
1056 if $params{'config_denial_message'};
1058 # cancelling the xdt will eventually cause an XMSG_DONE, which will notice
1059 # the error and set the result correctly; but if there's no xfer, then we
1060 # can just call _dump_done directly.
1061 if (defined $self->{'xfer'}) {
1062 $self->dbg("cancelling the transfer: $error_message");
1064 $self->{'xfer'}->cancel();
1066 if (defined $self->{'dump_cb'}) {
1067 # _dump_done constructs the dump_cb from $self parameters
1068 $self->_dump_done();
1070 die "error with no callback to handle it: $error_message";
1075 # release the outstanding reservation, calling scribe_notif_tape_done
1077 sub _release_reservation {
1083 my ($label, $fm, $kb);
1085 # if we've already written a volume, log it
1086 if ($self->{'device'} and defined $self->{'device'}->volume_label) {
1087 $do_eject = 1 if $self->{'eject_volume'};
1088 $label = $self->{'device'}->volume_label();
1089 $fm = $self->{'device'}->file();
1090 $kb = $self->{'device_size'} / 1024;
1092 # log a message for amreport
1093 $self->{'feedback'}->scribe_notif_log_info(
1094 message => "tape $label kb $kb fm $fm [OK]");
1097 # finish the device if it isn't finished yet
1098 if ($self->{'device'}) {
1099 my $already_in_error = $self->{'device'}->status() != $DEVICE_STATUS_SUCCESS;
1101 if (!$self->{'device'}->finish() && !$already_in_error) {
1102 push @errors, $self->{'device'}->error_or_status();
1105 $self->{'device'} = undef;
1106 $self->{'device_at_eom'} = 0;
1108 $self->{'reservation'}->release(eject => $do_eject, finished_cb => sub {
1110 push @errors, "$err" if $err;
1112 $self->{'reservation'} = undef;
1114 # notify the feedback that we've finished and released a tape
1116 return $self->{'feedback'}->scribe_notif_tape_done(
1117 volume_label => $label,
1120 finished_cb => sub {
1121 $params{'finished_cb'}->(@errors? join("; ", @errors) : undef);
1125 $params{'finished_cb'}->(@errors? join("; ", @errors) : undef);
1129 # invoke the devhandling to get a new device, with all of the requisite
1130 # notifications and checks and whatnot. On *success*, call _start_dump; on
1131 # failure, call other appropriate methods.
1132 sub _get_new_volume {
1135 # release first, if necessary
1136 if ($self->{'reservation'}) {
1137 $self->_release_reservation(finished_cb => sub {
1141 $self->_operation_failed(device_error => $error);
1143 $self->_get_new_volume();
1150 $self->{'devhandling'}->get_volume(volume_cb => sub { $self->_volume_cb(@_); });
1155 my ($scan_error, $config_denial_message, $error_denial_message,
1156 $reservation, $new_label, $access_mode, $is_new, $new_scribe) = @_;
1158 # note that we prefer the config_denial_message over the scan error. If
1159 # both occurred, then the results of the scan are immaterial -- we
1160 # shouldn't have been looking for a new volume anyway.
1162 if ($config_denial_message) {
1163 $self->_operation_failed(config_denial_message => $config_denial_message);
1167 if ($error_denial_message) {
1168 $self->_operation_failed(device_error => $error_denial_message);
1173 # Transfer the xfer to the new scribe
1174 $self->dbg("take scribe from");
1176 $new_scribe->{'dump_cb'} = $self->{'dump_cb'};
1177 $new_scribe->{'dump_header'} = $self->{'dump_header'};
1178 $new_scribe->{'retry_part_on_peom'} = $self->{'retry_part_on_peom'};
1179 $new_scribe->{'allow_split'} = $self->{'allow_split'};
1180 $new_scribe->{'split_method'} = $self->{'split_method'};
1181 $new_scribe->{'xfer'} = $self->{'xfer'};
1182 $new_scribe->{'xdt'} = $self->{'xdt'};
1183 $new_scribe->{'xdt_ready'} = $self->{'xdt_ready'};
1184 $new_scribe->{'start_part_on_xdt_ready'} = $self->{'start_part_on_xdt_ready'};
1185 $new_scribe->{'size'} = $self->{'size'};
1186 $new_scribe->{'duration'} = $self->{'duration'};
1187 $new_scribe->{'dump_start_time'} = $self->{'dump_start_time'};
1188 $new_scribe->{'last_part_successful'} = $self->{'last_part_successful'};
1189 $new_scribe->{'started_writing'} = $self->{'started_writing'};
1190 $new_scribe->{'feedback'} = $self->{'feedback'};
1191 $new_scribe->{'devhandling'}->{'feedback'} = $self->{'feedback'};
1192 $self->{'dump_header'} = undef;
1193 $self->{'dump_cb'} = undef;
1194 $self->{'xfer'} = undef;
1195 $self->{'xdt'} = undef;
1196 $self->{'xdt_ready'} = undef;
1197 $self->{'dump_start_time'} = undef;
1198 $self->{'started_writing'} = 0;
1199 $self->{'feedback'} = undef;
1200 if (defined $new_scribe->{'device'}) {
1201 $new_scribe->{'xdt'}->use_device($new_scribe->{'device'});
1204 $new_scribe->_start_part();
1210 # we had permission to use a tape, but didn't find a tape, so we need
1212 $self->{'feedback'}->scribe_notif_new_tape(
1213 error => $scan_error,
1214 volume_label => undef);
1216 $self->_operation_failed(device_error => $scan_error);
1220 $self->dbg("got new volume; writing new label");
1222 # from here on, if an error occurs, we must send scribe_notif_new_tape, and look
1224 $self->{'reservation'} = $reservation;
1225 $self->{'device_size'} = 0;
1226 my $device = $self->{'device'} = $reservation->{'device'};
1228 # turn on verbose logging now, if we need it
1229 if ($self->{'debug'}) {
1230 $reservation->{'device'}->property_set("verbose", 1);
1233 # read the label once, to get a "before" snapshot (see below)
1237 if (($device->status & ~$DEVICE_STATUS_VOLUME_UNLABELED)
1238 && !($device->status & $DEVICE_STATUS_VOLUME_UNLABELED)) {
1239 $self->{'feedback'}->scribe_notif_new_tape(
1240 error => "while reading label on new volume: " . $device->error_or_status(),
1241 volume_label => undef);
1243 return $self->_get_new_volume();
1245 $old_label = $device->volume_label;
1246 $old_timestamp = $device->volume_time;
1249 # inform the xdt about this new device before starting it
1250 $self->{'xdt'}->use_device($device);
1253 my $steps = define_steps
1256 step device_start => sub {
1257 $self->_device_start($reservation, $access_mode, $new_label, $is_new,
1258 $steps->{'device_started'});
1261 step device_started => sub {
1265 # try reading the label to see whether we erased the tape
1268 # don't worry about erasing new tapes
1270 last CHECK_READ_LABEL;
1274 $device->read_label();
1276 # does the device think something is broken now?
1277 if (($device->status & ~$DEVICE_STATUS_VOLUME_UNLABELED)
1278 and !($device->status & $DEVICE_STATUS_VOLUME_UNLABELED)) {
1280 last CHECK_READ_LABEL;
1283 # has the label changed?
1284 my $vol_label = $device->volume_label;
1285 if ((!defined $old_label and defined $vol_label)
1286 or (defined $old_label and !defined $vol_label)
1287 or (defined $old_label and $old_label ne $vol_label)) {
1289 last CHECK_READ_LABEL;
1292 # has the timestamp changed?
1293 my $vol_timestamp = $device->volume_time;
1294 if ((!defined $old_timestamp and defined $vol_timestamp)
1295 or (defined $old_timestamp and !defined $vol_timestamp)
1296 or (defined $old_timestamp and $old_timestamp ne $vol_timestamp)) {
1298 last CHECK_READ_LABEL;
1302 $self->{'feedback'}->scribe_notif_new_tape(
1303 error => "while labeling new volume: " . $device->error_or_status(),
1304 volume_label => $erased? $new_label : undef);
1306 $self->_get_new_volume();
1308 } elsif ($result != 1) {
1309 $self->{'feedback'}->scribe_notif_new_tape(
1311 volume_label => undef);
1312 $self->_get_new_volume();
1316 $new_label = $device->volume_label;
1319 $self->{'feedback'}->scribe_notif_new_tape(
1321 volume_label => $new_label);
1323 $self->{'reservation'}->set_label(label => $new_label,
1324 finished_cb => $steps->{'set_labelled'});
1327 step set_labelled => sub {
1330 $self->{'feedback'}->scribe_notif_log_info(
1331 message => "Error from set_label: $err");
1332 # fall through to start_part anyway...
1334 $self->_start_part();
1339 # return 0 for device->start error
1340 # return 1 for success
1341 # return a message for others error
1344 my ($reservation, $access_mode, $new_label, $is_new, $finished_cb) = @_;
1346 my $device = $reservation->{'device'};
1347 my $tl = $self->{'taperscan'}->{'tapelist'};
1350 if (!defined $tl) { # For Mock::Taperscan in installcheck
1351 if (!$device->start($access_mode, $new_label, $self->{'write_timestamp'})) {
1352 return $finished_cb->(0);
1354 return $finished_cb->(1);
1358 my $steps = define_steps
1359 cb_ref => \$finished_cb;
1362 return $reservation->get_meta_label(
1363 finished_cb => $steps->{'got_meta_label'});
1366 step got_meta_label => sub {
1367 my ($err, $meta) = @_;
1370 # generate the new label and write it to the tapelist file
1373 ($meta, $err) = $reservation->make_new_meta_label();
1376 return $finished_cb->($err);
1379 ($new_label, my $err) = $reservation->make_new_tape_label(
1381 if (!defined $new_label) {
1383 return $finished_cb->($err);
1385 $tl->add_tapelabel('0', $new_label, undef, 1, $meta,
1386 $reservation->{'barcode'});
1388 $self->dbg("generate new label '$new_label'");
1389 } elsif (!defined $meta) {
1391 my $tle = $tl->lookup_tapelabel($new_label);
1392 my $meta = $tle->{'meta'};
1395 # write the label to the device
1396 if (!$device->start($access_mode, $new_label, $self->{'write_timestamp'})) {
1398 # remove the generated label from the tapelist file
1400 $tl->remove_tapelabel($new_label);
1403 return $finished_cb->(0);
1406 # rewrite the tapelist file
1408 my $tle = $tl->lookup_tapelabel($new_label);
1409 $meta = $tle->{'meta'} if !$meta && $tle->{'meta'};
1410 $tl->remove_tapelabel($new_label);
1411 $tl->add_tapelabel($self->{'write_timestamp'}, $new_label,
1412 $tle? $tle->{'comment'} : undef, 1, $meta,
1413 $reservation->{'barcode'}, $device->block_size/1024);
1416 $reservation->set_meta_label(meta => $meta,
1417 finished_cb => $steps->{'set_meta_label'});
1420 step set_meta_label => sub {
1421 return $finished_cb->(1);
1426 my ($self, $msg) = @_;
1427 if ($self->{'debug'}) {
1428 debug("Amanda::Taper::Scribe: $msg");
1432 sub get_splitting_args_from_config {
1437 $splitting_args{'allow_split'} = 0;
1438 # if dle_splitting is false, then we don't split - easy.
1439 if (defined $params{'dle_allow_split'} and !$params{'dle_allow_split'}) {
1440 return %splitting_args;
1444 my $have_space = sub {
1445 my ($dirname, $part_size) = @_;
1448 my $fsusage = Amanda::Util::get_fs_usage($dirname);
1449 confess "$dirname" if (!$fsusage);
1451 my $avail = $fsusage->{'blocksize'} * $fsusage->{'bavail'};
1452 if ($avail < $part_size) {
1453 Amanda::Debug::debug("disk cache has $avail bytes available on $dirname, but " .
1454 "needs $part_size");
1461 # first, handle the alternate spellings for part_size and part_cache_type
1462 $params{'part_size'} = $params{'part_size_kb'} * 1024
1463 if (defined $params{'part_size_kb'});
1465 if (defined $params{'part_cache_type_enum'}) {
1466 $params{'part_cache_type'} = 'none'
1467 if ($params{'part_cache_type_enum'} == $PART_CACHE_TYPE_NONE);
1468 $params{'part_cache_type'} = 'memory'
1469 if ($params{'part_cache_type_enum'} == $PART_CACHE_TYPE_MEMORY);
1470 $params{'part_cache_type'} = 'disk'
1471 if ($params{'part_cache_type_enum'} == $PART_CACHE_TYPE_DISK);
1473 $params{'part_cache_type'} = 'unknown'
1474 unless defined $params{'part_cache_type'};
1477 # if any of the dle_* parameters are set, use those to set the part_*
1478 # parameters, which are emptied out first.
1479 if (defined $params{'dle_tape_splitsize'} or
1480 defined $params{'dle_split_diskbuffer'} or
1481 defined $params{'dle_fallback_splitsize'}) {
1483 $params{'part_size'} = $params{'dle_tape_splitsize'} || 0;
1484 $params{'part_cache_type'} = 'none';
1485 $params{'part_cache_dir'} = undef;
1486 $params{'part_cache_max_size'} = undef;
1488 # part cache type is memory unless we have a split_diskbuffer that fits the bill
1489 if ($params{'part_size'}) {
1490 $splitting_args{'allow_split'} = 1;
1491 $params{'part_cache_type'} = 'memory';
1492 if (defined $params{'dle_split_diskbuffer'}
1493 and -d $params{'dle_split_diskbuffer'}) {
1494 if ($have_space->($params{'dle_split_diskbuffer'}, $params{'part_size'})) {
1495 # disk cache checks out, so use it
1496 $params{'part_cache_type'} = 'disk';
1497 $params{'part_cache_dir'} = $params{'dle_split_diskbuffer'};
1499 my $msg = "falling back to memory buffer for splitting: " .
1500 "insufficient space in disk cache directory";
1501 $splitting_args{'warning'} = $msg;
1506 if ($params{'part_cache_type'} eq 'memory') {
1507 # fall back to 10M if fallback size is not given
1508 $params{'part_cache_max_size'} = $params{'dle_fallback_splitsize'} || 10*1024*1024;
1511 my $ps = $params{'part_size'};
1512 my $pcms = $params{'part_cache_max_size'};
1513 $ps = $pcms if (!defined $ps or (defined $pcms and $pcms < $ps));
1514 $splitting_args{'allow_split'} = 1 if ((defined $ps and $ps > 0) or
1515 $params{'leom_supported'});
1517 # fail back from 'disk' to 'none' if the disk isn't set up correctly
1518 if (defined $params{'part_cache_type'} and
1519 $params{'part_cache_type'} eq 'disk') {
1521 if (!$params{'part_cache_dir'}) {
1522 $warning = "no part-cache-dir specified; "
1523 . "using part cache type 'none'";
1524 } elsif (!-d $params{'part_cache_dir'}) {
1525 $warning = "part-cache-dir '$params{part_cache_dir} "
1526 . "does not exist; using part cache type 'none'";
1527 } elsif (!$have_space->($params{'part_cache_dir'}, $ps)) {
1528 $warning = "part-cache-dir '$params{part_cache_dir} "
1529 . "has insufficient space; using part cache type 'none'";
1532 if (defined $warning) {
1533 $splitting_args{'warning'} = $warning;
1534 $params{'part_cache_type'} = 'none';
1535 delete $params{'part_cache_dir'};
1540 $splitting_args{'part_size'} = $params{'part_size'}
1541 if defined($params{'part_size'});
1542 $splitting_args{'part_cache_type'} = $params{'part_cache_type'}
1543 if defined($params{'part_cache_type'});
1544 $splitting_args{'part_cache_dir'} = $params{'part_cache_dir'}
1545 if defined($params{'part_cache_dir'});
1546 $splitting_args{'part_cache_max_size'} = $params{'part_cache_max_size'}
1547 if defined($params{'part_cache_max_size'});
1549 return %splitting_args;
1555 package Amanda::Taper::Scribe::Feedback;
1557 sub request_volume_permission {
1561 # sure, you can have as many volumes as you want!
1562 $params{'perm_cb'}->(allow => 1);
1565 sub scribe_notif_new_tape { }
1566 sub scribe_notif_part_done { }
1567 sub scribe_notif_log_info { }
1568 sub scribe_notif_tape_done {
1572 $params{'finished_cb'}->();
1579 package Amanda::Taper::Scribe::DevHandling;
1580 use Amanda::MainLoop;
1582 use Amanda::Debug qw( :logging );
1584 # This class handles scanning for volumes, requesting permission for those
1585 # volumes (the driver likes to feel like it's in control), and providing those
1586 # volumes to the scribe on request. These can all happen independently, but
1587 # the scribe cannot begin writing to a volume until all three have finished.
1588 # That is: the scan is finished, the driver has given its permission, and the
1589 # scribe has requested a volume.
1591 # On start, the class starts scanning immediately, even though the scribe has
1592 # not requested a volume. Subsequently, a new scan does not begin until the
1593 # scribe requests a volume.
1595 # This class is "private" to Amanda::Taper::Scribe, so it is documented in
1596 # comments, rather than POD.
1598 # Create a new DevHandling object. Params are taperscan and feedback.
1604 taperscan => $params{'taperscan'},
1605 feedback => $params{'feedback'},
1607 # is a scan currently running, or completed?
1610 scan_error => undef,
1613 reservation => undef,
1615 volume_label => undef,
1617 # requests for permissiont to use a new volume
1618 request_pending => 0,
1619 request_complete => 0,
1620 request_denied => 0,
1621 config_denial_message => undef,
1622 error_denial_message => undef,
1624 volume_cb => undef, # callback for get_volume
1625 start_finished_cb => undef, # callback for start
1628 return bless ($self, $class);
1633 # Called at scribe startup, this starts the instance off with a scan.
1638 $self->{'start_finished_cb'} = $params{'finished_cb'};
1639 $self->_start_scanning();
1646 for my $rq_param (qw(finished_cb)) {
1647 croak "required parameter '$rq_param' mising"
1648 unless exists $params{$rq_param};
1651 # since there's little other option than to barrel on through the
1652 # quitting procedure, quit() just accumulates its error messages
1653 # and, if necessary, concantenates them for the finished_cb.
1656 my $cleanup_cb = make_cb(cleanup_cb => sub {
1658 push @errors, $error if $error;
1660 $error = join("; ", @errors) if @errors >= 1;
1662 $params{'finished_cb'}->($error);
1665 if ($self->{'reservation'}) {
1666 if ($self->{'device'}) {
1667 if (!$self->{'device'}->finish()) {
1668 push @errors, $self->{'device'}->error_or_status();
1672 $self->{'reservation'}->release(finished_cb => $cleanup_cb);
1674 $cleanup_cb->(undef);
1678 # Get an open, started device and label to start writing to. The
1679 # volume_callback takes the following arguments:
1680 # $scan_error -- error message, or undef if no error occurred
1681 # $config_denial_reason -- config-related reason request was denied, or undef
1682 # $error_denial_reason -- error-related reason request was denied, or undef
1683 # $reservation -- Amanda::Changer reservation
1684 # $device -- open, started device
1685 # It is the responsibility of the caller to close the device and release the
1686 # reservation when finished. If $scan_error or $request_denied_info are
1687 # defined, then $reservation and $device will be undef.
1692 die "already processing a volume request"
1693 if ($self->{'volume_cb'});
1695 $self->{'volume_cb'} = $params{'volume_cb'};
1697 # kick off the relevant processes, if they're not already running
1698 $self->_start_request();
1700 $self->_maybe_callback();
1703 # take a peek at the device we have, for which permission has not yet been
1704 # granted. This will be undefined before the taperscan completes AND after
1705 # the volume_cb has been called.
1709 return $self->{'device'};
1715 if (!$self->{'scan_running'} && !$self->{'reservation'}) {
1716 $self->_start_scanning();
1722 sub _start_scanning {
1725 return if $self->{'scan_running'} or $self->{'scan_finished'};
1727 $self->{'scan_running'} = 1;
1729 my $_user_msg_fn = sub {
1731 if (exists($params{'slot_result'})) {
1732 if ($params{'does_not_match_labelstr'}) {
1733 $self->{'feedback'}->scribe_notif_log_info(
1734 message => "Slot $params{'slot'} with label $params{'label'} do not match labelstr");
1735 } elsif ($params{'not_in_tapelist'}) {
1736 $self->{'feedback'}->scribe_notif_log_info(
1737 message => "Slot $params{'slot'} with label $params{'label'} is not in the tapelist");
1738 } elsif ($params{'active'}) {
1739 $self->{'feedback'}->scribe_notif_log_info(
1740 message => "Slot $params{'slot'} with label $params{'label'} is not reusable");
1741 } elsif ($params{'not_autolabel'}) {
1742 if ($params{'label'}) {
1743 $self->{'feedback'}->scribe_notif_log_info(
1744 message => "Slot $params{'slot'} with label $params{'label'} is not labelable ");
1746 $self->{'feedback'}->scribe_notif_log_info(
1747 message => "Slot $params{'slot'} without label is not labelable ");
1749 } elsif ($params{'empty'}) {
1750 $self->{'feedback'}->scribe_notif_log_info(
1751 message => "Slot $params{'slot'} is empty, autolabel disabled");
1752 } elsif ($params{'non_amanda'}) {
1753 $self->{'feedback'}->scribe_notif_log_info(
1754 message => "Slot $params{'slot'} is a non-amanda volume, autolabel disabled");
1755 } elsif ($params{'volume_error'}) {
1756 $self->{'feedback'}->scribe_notif_log_info(
1757 message => "Slot $params{'slot'} is a volume in error: $params{'err'}, autolabel disabled");
1758 } elsif ($params{'not_success'}) {
1759 $self->{'feedback'}->scribe_notif_log_info(
1760 message => "Slot $params{'slot'} is a device in error: $params{'err'}, autolabel disabled");
1761 } elsif ($params{'err'}) {
1762 $self->{'feedback'}->scribe_notif_log_info(
1763 message => "$params{'err'}");
1764 } elsif ($params{'not_labelable'}) {
1765 $self->{'feedback'}->scribe_notif_log_info(
1766 message => "Slot $params{'slot'} without label can't be labeled");
1767 } elsif (!defined $params{'label'}) {
1768 $self->{'feedback'}->scribe_notif_log_info(
1769 message => "Slot $params{'slot'} without label can be labeled");
1771 $self->{'feedback'}->scribe_notif_log_info(
1772 message => "Slot $params{'slot'} with label $params{'label'} is usable");
1777 $self->{'taperscan'}->scan(
1778 user_msg_fn => $_user_msg_fn,
1780 my ($error, $reservation, $volume_label, $access_mode, $is_new) = @_;
1782 $self->{'scan_running'} = 0;
1783 $self->{'scan_finished'} = 1;
1785 $self->{'scan_error'} = $error;
1786 $self->{'reservation'} = $reservation;
1787 $self->{'device'} = $reservation->{'device'} if $reservation;
1788 $self->{'volume_label'} = $volume_label;
1789 $self->{'access_mode'} = $access_mode;
1790 $self->{'is_new'} = $is_new;
1792 $self->_maybe_callback();
1796 sub _start_request {
1799 return if $self->{'request_pending'} or $self->{'request_complete'};
1801 $self->{'request_pending'} = 1;
1803 $self->{'feedback'}->request_volume_permission(
1807 $self->{'request_pending'} = 0;
1808 $self->{'request_complete'} = 1;
1809 if (defined $params{'scribe'}) {
1810 $self->{'new_scribe'} = $params{'scribe'};
1811 $self->{'scan_finished'} = 1;
1812 $self->{'request_complete'} = 1;
1813 } elsif (defined $params{'cause'}) {
1814 $self->{'request_denied'} = 1;
1815 if ($params{'cause'} eq 'config') {
1816 $self->{'config_denial_message'} = $params{'message'};
1817 } elsif ($params{'cause'} eq 'error') {
1818 $self->{'error_denial_message'} = $params{'message'};
1820 die "bad cause '" . $params{'cause'} . "'";
1822 } elsif (!defined $params{'allow'}) {
1823 die "no allow or cause defined";
1826 $self->_maybe_callback();
1830 sub _maybe_callback {
1833 # if we have any kind of error, release the reservation and come back
1835 if (($self->{'scan_error'} or $self->{'request_denied'}) and $self->{'reservation'}) {
1836 $self->{'device'} = undef;
1838 $self->{'reservation'}->release(finished_cb => sub {
1841 # so many errors, so little time..
1843 if ($self->{'scan_error'}) {
1844 warning("ignoring error releasing reservation ($error) after a scan error");
1846 $self->{'scan_error'} = $error;
1850 $self->{'reservation'} = undef;
1851 $self->_maybe_callback();
1857 # if we are just starting up, call the finished_cb given to start()
1858 if (defined $self->{'start_finished_cb'} and $self->{'scan_finished'}) {
1859 my $cb = $self->{'start_finished_cb'};
1860 $self->{'start_finished_cb'} = undef;
1862 $cb->($self->{'scan_error'});
1865 # if the volume_cb is good to get called, call it and reset to the ground state
1866 if ($self->{'volume_cb'} and (!$self->{'scan_running'} or $self->{'scan_finished'}) and $self->{'request_complete'}) {
1867 # get the cb and its arguments lined up before calling it..
1868 my $volume_cb = $self->{'volume_cb'};
1869 my @volume_cb_args = (
1870 $self->{'scan_error'},
1871 $self->{'config_denial_message'},
1872 $self->{'error_denial_message'},
1873 $self->{'reservation'},
1874 $self->{'volume_label'},
1875 $self->{'access_mode'},
1877 $self->{'new_scribe'},
1880 # reset everything and prepare for a new scan
1881 $self->{'scan_finished'} = 0;
1883 $self->{'reservation'} = undef;
1884 $self->{'device'} = undef;
1885 $self->{'volume_label'} = undef;
1887 $self->{'request_complete'} = 0;
1888 $self->{'request_denied'} = 0;
1889 $self->{'config_denial_message'} = undef;
1890 $self->{'error_denial_message'} = undef;
1891 $self->{'volume_cb'} = undef;
1892 $self->{'new_scribe'} = undef;
1894 $volume_cb->(@volume_cb_args);