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 write_timestamp => undef,
457 # device handling, and our current device and reservation
458 devhandling => Amanda::Taper::Scribe::DevHandling->new(
459 taperscan => $params{'taperscan'},
460 feedback => $params{'feedback'},
462 reservation => undef,
464 device_size => undef,
465 device_at_eom => undef, # device still exists, but is full
467 # callback passed to start_dump
470 # information for the current dumpfile
471 dump_header => undef,
472 retry_part_on_peom => undef,
473 allow_split => undef,
477 start_part_on_xdt_ready => 0,
480 dump_start_time => undef,
481 last_part_successful => 0,
482 started_writing => 0,
484 config_denial_message => undef,
487 return bless ($self, $class);
494 for my $rq_param qw(write_timestamp finished_cb) {
495 croak "required parameter '$rq_param' missing"
496 unless exists $params{$rq_param};
499 die "scribe already started" if $self->{'started'};
501 $self->dbg("starting");
502 $self->{'write_timestamp'} = $params{'write_timestamp'};
504 # start up the DevHandling object, making sure we know
505 # when it's done with its startup process
506 $self->{'devhandling'}->start(finished_cb => sub {
507 $self->{'started'} = 1;
508 $params{'finished_cb'}->(@_);
516 # since there's little other option than to barrel on through the
517 # quitting procedure, quit() just accumulates its error messages
518 # and, if necessary, concantenates them for the finished_cb.
521 my $steps = define_steps
522 cb_ref => \$params{'finished_cb'};
525 $self->dbg("quitting");
527 if ($self->{'xfer'}) {
528 die "Scribe cannot quit while a transfer is active";
529 # Supporting this would be complicated:
530 # - cancel the xfer and wait for it to complete
531 # - ensure that the taperscan not be started afterward
532 # and isn't required for normal Amanda operation.
535 $steps->{'release'}->();
538 step release => sub {
539 if ($self->{'reservation'}) {
540 $self->_release_reservation(finished_cb => $steps->{'released'});
542 $steps->{'stop_devhandling'}->();
546 step released => sub {
548 push @errors, "$err" if $err;
550 $self->{'reservation'} = undef;
552 $steps->{'stop_devhandling'}->();
555 step stop_devhandling => sub {
556 $self->{'devhandling'}->quit(finished_cb => $steps->{'stopped_devhandling'});
559 step stopped_devhandling => sub {
561 push @errors, "$err" if $err;
563 my $errmsg = join("; ", @errors) if @errors >= 1;
564 $params{'finished_cb'}->($errmsg);
571 # Can return a device we already have, or "peek" at the
572 # DevHandling object's device.
573 # It might not have right permission on the device.
576 if (defined $self->{'device'}) {
577 $device = $self->{'device'};
579 $device = $self->{'devhandling'}->peek_device();
584 sub check_data_path {
586 my $data_path = shift;
588 my $device = $self->get_device();
590 if (!defined $device) {
591 die "no device is available to check the datapath";
594 my $use_directtcp = $device->directtcp_supported();
597 if (!$use_directtcp) {
598 if ($data_path eq 'DIRECTTCP') {
599 return "Can't dump DIRECTTCP data-path dle to a device ('" .
600 $device->device_name .
601 "') that doesn't support it";
610 $self->{'devhandling'}->start_scan();
613 # Get a transfer destination; does not use a callback
618 for my $rq_param qw(max_memory) {
619 croak "required parameter '$rq_param' missing"
620 unless exists $params{$rq_param};
623 die "not yet started"
624 unless $self->{'write_timestamp'} and $self->{'started'};
625 die "xfer element already returned"
627 die "xfer already running"
628 if ($self->{'xfer'});
630 $self->{'xfer'} = undef;
631 $self->{'xdt'} = undef;
633 $self->{'duration'} = 0.0;
634 $self->{'nparts'} = undef;
635 $self->{'dump_start_time'} = undef;
636 $self->{'last_part_successful'} = 1;
637 $self->{'started_writing'} = 0;
638 $self->{'device_errors'} = [];
639 $self->{'config_denial_message'} = undef;
642 $self->{'dump_cb'} = undef;
643 $self->{'retry_part_on_peom'} = 1;
644 $self->{'allow_split'} = 0;
645 $self->{'start_part_on_xdt_ready'} = 0;
647 # start getting parameters together to determine what kind of splitting
648 # and caching we're going to do
649 my $part_size = $params{'part_size'} || 0;
650 my ($use_mem_cache, $disk_cache_dirname) = (0, undef);
651 my $can_cache_inform = $params{'can_cache_inform'};
652 my $part_cache_type = $params{'part_cache_type'} || 'none';
653 my $allow_split = $params{'allow_split'};
655 my $xdt_first_dev = $self->get_device();
656 if (!defined $xdt_first_dev) {
657 die "no device is available to create an xfer_dest";
659 my $leom_supported = $xdt_first_dev->property_get("leom");
660 my $use_directtcp = $xdt_first_dev->directtcp_supported();
662 # figure out the destination type we'll use, based on the circumstances
663 my ($dest_type, $dest_text);
664 if ($use_directtcp) {
665 $dest_type = 'directtcp';
666 $dest_text = "using DirectTCP";
667 } elsif ($can_cache_inform && $leom_supported) {
668 $dest_type = 'splitter';
669 $dest_text = "using LEOM (falling back to holding disk as cache)";
670 } elsif ($leom_supported) {
671 $dest_type = 'splitter';
672 $dest_text = "using LEOM detection (no caching)";
673 } elsif ($can_cache_inform) {
674 $dest_type = 'splitter';
675 $dest_text = "using cache_inform";
676 } elsif ($part_cache_type ne 'none') {
677 $dest_type = 'cacher';
679 # we'll be caching, so apply the maximum size
680 my $part_cache_max_size = $params{'part_cache_max_size'} || 0;
681 $part_size = $part_cache_max_size
682 if ($part_cache_max_size and $part_cache_max_size < $part_size);
684 # and figure out what kind of caching to apply
685 if ($part_cache_type eq 'memory') {
688 # note that we assume this has already been checked; if it's wrong,
689 # the xfer element will just fail immediately
690 $disk_cache_dirname = $params{'part_cache_dir'};
692 $dest_text = "using cache type '$part_cache_type'";
694 $dest_type = 'splitter';
695 $dest_text = "using no cache (PEOM will be fatal)";
697 # no directtcp, no caching, no cache_inform, and no LEOM, so a PEOM will be fatal
698 $self->{'retry_part_on_peom'} = 0;
702 ($can_cache_inform ||
703 !defined($part_cache_type) ||
704 $part_cache_type eq 'disk' ||
705 $part_cache_type eq 'memory' ||
707 $self->{'allow_split'} = 1;
709 $self->{'allow_split'} = 0;
712 $self->{'retry_part_on_peom'} = 0 if !$self->{'allow_split'};
714 debug("Amanda::Taper::Scribe preparing to write, part size $part_size, "
715 . "$dest_text ($dest_type) "
716 . ($leom_supported? " (LEOM supported)" : " (no LEOM)"));
718 # set the device to verbose logging if we're in debug mode
719 if ($self->{'debug'}) {
720 $xdt_first_dev->property_set("verbose", 1);
724 if ($dest_type eq 'directtcp') {
725 $xdt = Amanda::Xfer::Dest::Taper::DirectTCP->new(
726 $xdt_first_dev, $part_size);
727 $self->{'xdt_ready'} = 0; # xdt isn't ready until we get XMSG_READY
728 } elsif ($dest_type eq 'splitter') {
729 $xdt = Amanda::Xfer::Dest::Taper::Splitter->new(
730 $xdt_first_dev, $params{'max_memory'}, $part_size, $can_cache_inform);
731 $self->{'xdt_ready'} = 1; # xdt is ready immediately
733 $xdt = Amanda::Xfer::Dest::Taper::Cacher->new(
734 $xdt_first_dev, $params{'max_memory'}, $part_size,
735 $use_mem_cache, $disk_cache_dirname);
736 $self->{'xdt_ready'} = 1; # xdt is ready immediately
738 $self->{'start_part_on_xdt_ready'} = 0;
739 $self->{'xdt'} = $xdt;
748 die "no xfer dest set up; call get_xfer_dest first"
749 unless defined $self->{'xdt'};
751 # get the header ready for writing (totalparts was set by the caller)
752 $self->{'dump_header'} = $params{'dump_header'};
753 $self->{'dump_header'}->{'partnum'} = 1;
755 # set up the dump_cb for when this dump is done, and keep the xfer
756 $self->{'dump_cb'} = $params{'dump_cb'};
757 $self->{'xfer'} = $params{'xfer'};
758 $self->{'dump_start_time'} = time;
761 $self->_start_part();
768 die "no xfer dest set up; call get_xfer_dest first"
769 unless defined $self->{'xdt'};
771 # set up the dump_cb for when this dump is done, and keep the xfer
772 $self->{'dump_cb'} = $params{'dump_cb'};
773 $self->{'xfer'} = $params{'xfer'};
775 # XXX The cancel should call dump_cb, but right now the xfer stays hung in
776 # accept. So we leave the xfer to its hang, and dump_cb is called and xdt
777 # and xfer are set to undef. This should be fixed in 3.2.
779 $self->{'xfer'}->cancel();
781 $self->{'dump_cb'}->(
784 config_denial_message => undef,
789 $self->{'xdt'} = undef;
790 $self->{'xfer'} = undef;
793 sub get_bytes_written {
796 if (defined $self->{'xdt'}) {
797 return $self->{'size'} + $self->{'xdt'}->get_part_bytes_written();
799 return $self->{'size'};
806 $self->dbg("trying to start part");
808 # if the xdt isn't ready yet, wait until it is; note that the XDT is still
809 # using the device right now, so we can't even label it yet.
810 if (!$self->{'xdt_ready'}) {
811 $self->dbg("XDT not ready yet; waiting until it is");
812 $self->{'start_part_on_xdt_ready'} = 1;
816 # we need an actual, permitted device at this point, so if we don't have
817 # one, then defer this start_part call until we do. The device may still
818 # exist, but be at EOM, if the last dump failed at EOM and was not retried
820 if (!$self->{'device'} or $self->{'device_at_eom'}) {
821 # _get_new_volume calls _start_part when it has a new volume in hand
822 return $self->_get_new_volume();
825 # if the dump wasn't successful, and we're not splitting, then bail out. It's
826 # up to higher-level components to re-try this dump on a new volume, if desired.
827 # Note that this should be caught in the XMSG_PART_DONE handler -- this is just
829 if (!$self->{'last_part_successful'} and !$self->{'retry_part_on_peom'}) {
830 $self->_operation_failed(device_error => "No space left on device (uncaught)");
834 # and start writing this part
835 $self->{'started_writing'} = 1;
836 $self->dbg("resuming transfer");
837 $self->{'xdt'}->start_part(!$self->{'last_part_successful'},
838 $self->{'dump_header'});
843 my ($src, $msg, $xfer) = @_;
845 if ($msg->{'type'} == $XMSG_DONE) {
846 $self->_xmsg_done($src, $msg, $xfer);
850 # for anything else we only pay attention to messages from
852 if ($msg->{'elt'} == $self->{'xdt'}) {
853 $self->dbg("got msg from xfer dest: $msg");
854 if ($msg->{'type'} == $XMSG_PART_DONE) {
855 $self->_xmsg_part_done($src, $msg, $xfer);
856 } elsif ($msg->{'type'} == $XMSG_READY) {
857 $self->_xmsg_ready($src, $msg, $xfer);
858 } elsif ($msg->{'type'} == $XMSG_ERROR) {
859 $self->_xmsg_error($src, $msg, $xfer);
864 sub _xmsg_part_done {
866 my ($src, $msg, $xfer) = @_;
868 # this handles successful zero-byte parts as a special case - they
869 # are an implementation detail of the splitting done by the transfer
872 if ($msg->{'successful'} and $msg->{'size'} == 0) {
873 $self->dbg("not notifying for empty, successful part");
875 # double-check partnum
876 die "Part numbers do not match!"
877 unless ($self->{'dump_header'}->{'partnum'} == $msg->{'partnum'});
880 $self->{'feedback'}->scribe_notif_part_done(
881 partnum => $msg->{'partnum'},
882 fileno => $msg->{'fileno'},
883 successful => $msg->{'successful'},
884 size => $msg->{'size'},
885 duration => $msg->{'duration'});
887 # increment nparts here, so empty parts are not counted
888 $self->{'nparts'} = $msg->{'partnum'};
891 $self->{'last_part_successful'} = $msg->{'successful'};
893 if ($msg->{'successful'}) {
894 $self->{'device_size'} += $msg->{'size'};
895 $self->{'size'} += $msg->{'size'};
896 $self->{'duration'} += $msg->{'duration'};
899 if (!$msg->{'eof'}) {
900 # update the header for the next dumpfile, if this was a non-empty part
901 if ($msg->{'successful'} and $msg->{'size'} != 0) {
902 $self->{'dump_header'}->{'partnum'}++;
906 # if there's an error finishing the device, it's probably just carryover
907 # from the error the Xfer::Dest::Taper encountered while writing to the
908 # device, so we ignore it.
909 if (!$self->{'device'}->finish()) {
910 my $devname = $self->{'device'}->device_name;
911 my $errmsg = $self->{'device'}->error_or_status();
912 $self->dbg("ignoring error while finishing device '$devname': $errmsg");
915 # if the part failed..
916 if (!$msg->{'successful'} || !$self->{'allow_split'}) {
917 # if no caching was going on, then the dump has failed
918 if (!$self->{'retry_part_on_peom'}) {
919 # mark this device as at EOM, since we are not going to look
920 # for another one yet
921 $self->{'device_at_eom'} = 1;
923 my $msg = "No space left on device";
924 if ($self->{'device'}->status() != $DEVICE_STATUS_SUCCESS) {
925 $msg = $self->{'device'}->error_or_status();
927 $self->_operation_failed(device_error => "$msg, splitting not enabled");
931 # log a message for amreport
932 $self->{'feedback'}->scribe_notif_log_info(
933 message => "Will request retry of failed split part.");
936 # get a new volume, then go on to the next part
937 $self->_get_new_volume();
939 # if the part was unsuccessful, but the xfer dest has reason to believe
940 # this is not due to EOM, then the dump is done
941 if (!$msg->{'successful'}) {
942 my $msg = "unknown error while dumping";
943 if ($self->{'device'}->status() != $DEVICE_STATUS_SUCCESS) {
944 $msg = $self->{'device'}->error_or_status();
946 $self->_operation_failed(device_error => $msg);
950 # no EOM -- go on to the next part
951 $self->_start_part();
958 my ($src, $msg, $xfer) = @_;
960 $self->dbg("XDT is ready");
961 $self->{'xdt_ready'} = 1;
962 if ($self->{'start_part_on_xdt_ready'}) {
963 $self->{'start_part_on_xdt_ready'} = 0;
964 $self->_start_part();
970 my ($src, $msg, $xfer) = @_;
972 # XMSG_ERROR from the XDT is always fatal
973 $self->_operation_failed(device_error => $msg->{'message'});
978 my ($src, $msg, $xfer) = @_;
980 if ($msg->{'type'} == $XMSG_DONE) {
981 $self->dbg("transfer is complete");
991 # determine the correct final status - DONE if we're done, PARTIAL
992 # if we've started writing to the volume, otherwise FAILED
993 if (@{$self->{'device_errors'}} or $self->{'config_denial_message'}) {
994 $result = $self->{'started_writing'}? 'PARTIAL' : 'FAILED';
999 my $dump_cb = $self->{'dump_cb'};
1000 my %dump_cb_args = (
1002 device_errors => $self->{'device_errors'},
1003 config_denial_message => $self->{'config_denial_message'},
1004 size => $self->{'size'},
1005 duration => $self->{'duration'},
1006 total_duration => time - $self->{'dump_start_time'},
1007 nparts => $self->{'nparts'});
1009 # reset everything and let the original caller know we're done
1010 $self->{'xfer'} = undef;
1011 $self->{'xdt'} = undef;
1012 $self->{'dump_header'} = undef;
1013 $self->{'dump_cb'} = undef;
1014 $self->{'size'} = 0;
1015 $self->{'duration'} = 0.0;
1016 $self->{'nparts'} = undef;
1017 $self->{'dump_start_time'} = undef;
1018 $self->{'device_errors'} = [];
1019 $self->{'config_denial_message'} = undef;
1021 # and call the callback
1022 $dump_cb->(%dump_cb_args);
1025 # keyword parameters are utilities to the caller: either specify
1026 # device_error to add to the device_errors list or config_denial_message
1027 # to set the corresponding key in $self.
1028 sub _operation_failed {
1032 my $error_message = $params{'device_error'}
1033 || $params{'config_denial_message'}
1035 $self->dbg("operation failed: $error_message");
1037 # tuck the message away as desired
1038 push @{$self->{'device_errors'}}, $params{'device_error'}
1039 if defined $params{'device_error'};
1040 $self->{'config_denial_message'} = $params{'config_denial_message'}
1041 if $params{'config_denial_message'};
1043 # cancelling the xdt will eventually cause an XMSG_DONE, which will notice
1044 # the error and set the result correctly; but if there's no xfer, then we
1045 # can just call _dump_done directly.
1046 if (defined $self->{'xfer'}) {
1047 $self->dbg("cancelling the transfer: $error_message");
1049 $self->{'xfer'}->cancel();
1051 if (defined $self->{'dump_cb'}) {
1052 # _dump_done constructs the dump_cb from $self parameters
1053 $self->_dump_done();
1055 die "error with no callback to handle it: $error_message";
1060 # release the outstanding reservation, calling scribe_notif_tape_done
1062 sub _release_reservation {
1067 my ($label, $fm, $kb);
1069 # if we've already written a volume, log it
1070 if ($self->{'device'} and defined $self->{'device'}->volume_label) {
1071 $label = $self->{'device'}->volume_label();
1072 $fm = $self->{'device'}->file();
1073 $kb = $self->{'device_size'} / 1024;
1075 # log a message for amreport
1076 $self->{'feedback'}->scribe_notif_log_info(
1077 message => "tape $label kb $kb fm $fm [OK]");
1080 # finish the device if it isn't finished yet
1081 if ($self->{'device'}) {
1082 my $already_in_error = $self->{'device'}->status() != $DEVICE_STATUS_SUCCESS;
1084 if (!$self->{'device'}->finish() && !$already_in_error) {
1085 push @errors, $self->{'device'}->error_or_status();
1088 $self->{'device'} = undef;
1089 $self->{'device_at_eom'} = 0;
1091 $self->{'reservation'}->release(finished_cb => sub {
1093 push @errors, "$err" if $err;
1095 $self->{'reservation'} = undef;
1097 # notify the feedback that we've finished and released a tape
1099 return $self->{'feedback'}->scribe_notif_tape_done(
1100 volume_label => $label,
1103 finished_cb => sub {
1104 $params{'finished_cb'}->(@errors? join("; ", @errors) : undef);
1108 $params{'finished_cb'}->(@errors? join("; ", @errors) : undef);
1112 # invoke the devhandling to get a new device, with all of the requisite
1113 # notifications and checks and whatnot. On *success*, call _start_dump; on
1114 # failure, call other appropriate methods.
1115 sub _get_new_volume {
1118 # release first, if necessary
1119 if ($self->{'reservation'}) {
1120 $self->_release_reservation(finished_cb => sub {
1124 $self->_operation_failed(device_error => $error);
1126 $self->_get_new_volume();
1133 $self->{'devhandling'}->get_volume(volume_cb => sub { $self->_volume_cb(@_); });
1138 my ($scan_error, $config_denial_message, $error_denial_message,
1139 $reservation, $new_label, $access_mode, $is_new, $new_scribe) = @_;
1141 # note that we prefer the config_denial_message over the scan error. If
1142 # both occurred, then the results of the scan are immaterial -- we
1143 # shouldn't have been looking for a new volume anyway.
1145 if ($config_denial_message) {
1146 $self->_operation_failed(config_denial_message => $config_denial_message);
1150 if ($error_denial_message) {
1151 $self->_operation_failed(device_error => $error_denial_message);
1156 # Transfer the xfer to the new scribe
1157 $self->dbg("take scribe from");
1159 $new_scribe->{'dump_cb'} = $self->{'dump_cb'};
1160 $new_scribe->{'dump_header'} = $self->{'dump_header'};
1161 $new_scribe->{'retry_part_on_peom'} = $self->{'retry_part_on_peom'};
1162 $new_scribe->{'allow_split'} = $self->{'allow_split'};
1163 $new_scribe->{'split_method'} = $self->{'split_method'};
1164 $new_scribe->{'xfer'} = $self->{'xfer'};
1165 $new_scribe->{'xdt'} = $self->{'xdt'};
1166 $new_scribe->{'xdt_ready'} = $self->{'xdt_ready'};
1167 $new_scribe->{'start_part_on_xdt_ready'} = $self->{'start_part_on_xdt_ready'};
1168 $new_scribe->{'size'} = $self->{'size'};
1169 $new_scribe->{'duration'} = $self->{'duration'};
1170 $new_scribe->{'dump_start_time'} = $self->{'dump_start_time'};
1171 $new_scribe->{'last_part_successful'} = $self->{'last_part_successful'};
1172 $new_scribe->{'started_writing'} = $self->{'started_writing'};
1173 $new_scribe->{'feedback'} = $self->{'feedback'};
1174 $new_scribe->{'devhandling'}->{'feedback'} = $self->{'feedback'};
1175 $self->{'dump_header'} = undef;
1176 $self->{'dump_cb'} = undef;
1177 $self->{'xfer'} = undef;
1178 $self->{'xdt'} = undef;
1179 $self->{'xdt_ready'} = undef;
1180 $self->{'dump_start_time'} = undef;
1181 $self->{'started_writing'} = 0;
1182 $self->{'feedback'} = undef;
1183 if (defined $new_scribe->{'device'}) {
1184 $new_scribe->{'xdt'}->use_device($new_scribe->{'device'});
1187 $new_scribe->_start_part();
1193 # we had permission to use a tape, but didn't find a tape, so we need
1195 $self->{'feedback'}->scribe_notif_new_tape(
1196 error => $scan_error,
1197 volume_label => undef);
1199 $self->_operation_failed(device_error => $scan_error);
1203 $self->dbg("got new volume; writing new label");
1205 # from here on, if an error occurs, we must send scribe_notif_new_tape, and look
1207 $self->{'reservation'} = $reservation;
1208 $self->{'device_size'} = 0;
1209 my $device = $self->{'device'} = $reservation->{'device'};
1211 # turn on verbose logging now, if we need it
1212 if ($self->{'debug'}) {
1213 $reservation->{'device'}->property_set("verbose", 1);
1216 # read the label once, to get a "before" snapshot (see below)
1220 if (($device->status & ~$DEVICE_STATUS_VOLUME_UNLABELED)
1221 && !($device->status & $DEVICE_STATUS_VOLUME_UNLABELED)) {
1222 $self->{'feedback'}->scribe_notif_new_tape(
1223 error => "while reading label on new volume: " . $device->error_or_status(),
1224 volume_label => undef);
1226 return $self->_get_new_volume();
1228 $old_label = $device->volume_label;
1229 $old_timestamp = $device->volume_time;
1232 # inform the xdt about this new device before starting it
1233 $self->{'xdt'}->use_device($device);
1236 my $steps = define_steps
1239 step device_start => sub {
1240 $self->_device_start($reservation, $access_mode, $new_label, $is_new,
1241 $steps->{'device_started'});
1244 step device_started => sub {
1248 # try reading the label to see whether we erased the tape
1251 # don't worry about erasing new tapes
1253 last CHECK_READ_LABEL;
1257 $device->read_label();
1259 # does the device think something is broken now?
1260 if (($device->status & ~$DEVICE_STATUS_VOLUME_UNLABELED)
1261 and !($device->status & $DEVICE_STATUS_VOLUME_UNLABELED)) {
1263 last CHECK_READ_LABEL;
1266 # has the label changed?
1267 my $vol_label = $device->volume_label;
1268 if ((!defined $old_label and defined $vol_label)
1269 or (defined $old_label and !defined $vol_label)
1270 or (defined $old_label and $old_label ne $vol_label)) {
1272 last CHECK_READ_LABEL;
1275 # has the timestamp changed?
1276 my $vol_timestamp = $device->volume_time;
1277 if ((!defined $old_timestamp and defined $vol_timestamp)
1278 or (defined $old_timestamp and !defined $vol_timestamp)
1279 or (defined $old_timestamp and $old_timestamp ne $vol_timestamp)) {
1281 last CHECK_READ_LABEL;
1285 $self->{'feedback'}->scribe_notif_new_tape(
1286 error => "while labeling new volume: " . $device->error_or_status(),
1287 volume_label => $erased? $new_label : undef);
1289 $self->_get_new_volume();
1291 } elsif ($result != 1) {
1292 $self->{'feedback'}->scribe_notif_new_tape(
1294 volume_label => undef);
1295 $self->_get_new_volume();
1299 $new_label = $device->volume_label;
1302 $self->{'feedback'}->scribe_notif_new_tape(
1304 volume_label => $new_label);
1306 $self->{'reservation'}->set_label(label => $new_label,
1307 finished_cb => $steps->{'set_labelled'});
1310 step set_labelled => sub {
1313 $self->{'feedback'}->scribe_notif_log_info(
1314 message => "Error from set_label: $err");
1315 # fall through to start_part anyway...
1317 $self->_start_part();
1322 # return 0 for device->start error
1323 # return 1 for success
1324 # return a message for others error
1327 my ($reservation, $access_mode, $new_label, $is_new, $finished_cb) = @_;
1329 my $device = $reservation->{'device'};
1330 my $tl = $self->{'taperscan'}->{'tapelist'};
1333 if (!defined $tl) { # For Mock::Taperscan in installcheck
1334 if (!$device->start($access_mode, $new_label, $self->{'write_timestamp'})) {
1335 return $finished_cb->(0);
1337 return $finished_cb->(1);
1341 my $steps = define_steps
1342 cb_ref => \$finished_cb;
1345 return $reservation->get_meta_label(
1346 finished_cb => $steps->{'got_meta_label'});
1349 step got_meta_label => sub {
1350 my ($err, $meta) = @_;
1353 # generate the new label and write it to the tapelist file
1355 ($new_label, my $err) = $reservation->make_new_tape_label();
1356 if (!defined $new_label) {
1358 return $finished_cb->($err);
1361 ($meta, $err) = $reservation->make_new_meta_label();
1364 return $finished_cb->($err);
1367 $tl->add_tapelabel('0', $new_label, undef, $meta, $reservation->{'barcode'});
1369 $self->dbg("generate new label '$new_label'");
1370 } elsif (!defined $meta) {
1372 my $tle = $tl->lookup_tapelabel($new_label);
1373 my $meta = $tle->{'meta'};
1376 # write the label to the device
1377 if (!$device->start($access_mode, $new_label, $self->{'write_timestamp'})) {
1379 # remove the generated label from the tapelist file
1381 $tl->remove_tapelabel($new_label);
1384 return $finished_cb->(0);
1387 # rewrite the tapelist file
1389 my $tle = $tl->lookup_tapelabel($new_label);
1390 $meta = $tle->{'meta'} if !$meta && $tle->{'meta'};
1391 $tl->remove_tapelabel($new_label);
1392 $tl->add_tapelabel($self->{'write_timestamp'}, $new_label,
1393 $tle? $tle->{'comment'} : undef, 1, $meta);
1396 $reservation->set_meta_label(meta => $meta,
1397 finished_cb => $steps->{'set_meta_label'});
1400 step set_meta_label => sub {
1401 return $finished_cb->(1);
1406 my ($self, $msg) = @_;
1407 if ($self->{'debug'}) {
1408 debug("Amanda::Taper::Scribe: $msg");
1412 sub get_splitting_args_from_config {
1417 $splitting_args{'allow_split'} = 0;
1418 # if dle_splitting is false, then we don't split - easy.
1419 if (defined $params{'dle_allow_split'} and !$params{'dle_allow_split'}) {
1420 return %splitting_args;
1424 my $have_space = sub {
1425 my ($dirname, $part_size) = @_;
1428 my $fsusage = Amanda::Util::get_fs_usage($dirname);
1429 confess "$dirname" if (!$fsusage);
1431 my $avail = $fsusage->{'blocksize'} * $fsusage->{'bavail'};
1432 if ($avail < $part_size) {
1433 Amanda::Debug::debug("disk cache has $avail bytes available on $dirname, but " .
1434 "needs $part_size");
1441 # first, handle the alternate spellings for part_size and part_cache_type
1442 $params{'part_size'} = $params{'part_size_kb'} * 1024
1443 if (defined $params{'part_size_kb'});
1445 if (defined $params{'part_cache_type_enum'}) {
1446 $params{'part_cache_type'} = 'none'
1447 if ($params{'part_cache_type_enum'} == $PART_CACHE_TYPE_NONE);
1448 $params{'part_cache_type'} = 'memory'
1449 if ($params{'part_cache_type_enum'} == $PART_CACHE_TYPE_MEMORY);
1450 $params{'part_cache_type'} = 'disk'
1451 if ($params{'part_cache_type_enum'} == $PART_CACHE_TYPE_DISK);
1453 $params{'part_cache_type'} = 'unknown'
1454 unless defined $params{'part_cache_type'};
1457 # if any of the dle_* parameters are set, use those to set the part_*
1458 # parameters, which are emptied out first.
1459 if (defined $params{'dle_tape_splitsize'} or
1460 defined $params{'dle_split_diskbuffer'} or
1461 defined $params{'dle_fallback_splitsize'}) {
1463 $params{'part_size'} = $params{'dle_tape_splitsize'} || 0;
1464 $params{'part_cache_type'} = 'none';
1465 $params{'part_cache_dir'} = undef;
1466 $params{'part_cache_max_size'} = undef;
1468 # part cache type is memory unless we have a split_diskbuffer that fits the bill
1469 if ($params{'part_size'}) {
1470 $splitting_args{'allow_split'} = 1;
1471 $params{'part_cache_type'} = 'memory';
1472 if (defined $params{'dle_split_diskbuffer'}
1473 and -d $params{'dle_split_diskbuffer'}) {
1474 if ($have_space->($params{'dle_split_diskbuffer'}, $params{'part_size'})) {
1475 # disk cache checks out, so use it
1476 $params{'part_cache_type'} = 'disk';
1477 $params{'part_cache_dir'} = $params{'dle_split_diskbuffer'};
1479 my $msg = "falling back to memory buffer for splitting: " .
1480 "insufficient space in disk cache directory";
1481 $splitting_args{'warning'} = $msg;
1486 if ($params{'part_cache_type'} eq 'memory') {
1487 # fall back to 10M if fallback size is not given
1488 $params{'part_cache_max_size'} = $params{'dle_fallback_splitsize'} || 10*1024*1024;
1491 my $ps = $params{'part_size'};
1492 my $pcms = $params{'part_cache_max_size'};
1493 $ps = $pcms if (!defined $ps or (defined $pcms and $pcms < $ps));
1494 $splitting_args{'allow_split'} = 1 if ((defined $ps and $ps > 0) or
1495 $params{'leom_supported'});
1497 # fail back from 'disk' to 'none' if the disk isn't set up correctly
1498 if (defined $params{'part_cache_type'} and
1499 $params{'part_cache_type'} eq 'disk') {
1501 if (!$params{'part_cache_dir'}) {
1502 $warning = "no part-cache-dir specified; "
1503 . "using part cache type 'none'";
1504 } elsif (!-d $params{'part_cache_dir'}) {
1505 $warning = "part-cache-dir '$params{part_cache_dir} "
1506 . "does not exist; using part cache type 'none'";
1507 } elsif (!$have_space->($params{'part_cache_dir'}, $ps)) {
1508 $warning = "part-cache-dir '$params{part_cache_dir} "
1509 . "has insufficient space; using part cache type 'none'";
1512 if (defined $warning) {
1513 $splitting_args{'warning'} = $warning;
1514 $params{'part_cache_type'} = 'none';
1515 delete $params{'part_cache_dir'};
1520 $splitting_args{'part_size'} = $params{'part_size'}
1521 if defined($params{'part_size'});
1522 $splitting_args{'part_cache_type'} = $params{'part_cache_type'}
1523 if defined($params{'part_cache_type'});
1524 $splitting_args{'part_cache_dir'} = $params{'part_cache_dir'}
1525 if defined($params{'part_cache_dir'});
1526 $splitting_args{'part_cache_max_size'} = $params{'part_cache_max_size'}
1527 if defined($params{'part_cache_max_size'});
1529 return %splitting_args;
1535 package Amanda::Taper::Scribe::Feedback;
1537 sub request_volume_permission {
1541 # sure, you can have as many volumes as you want!
1542 $params{'perm_cb'}->(allow => 1);
1545 sub scribe_notif_new_tape { }
1546 sub scribe_notif_part_done { }
1547 sub scribe_notif_log_info { }
1548 sub scribe_notif_tape_done {
1552 $params{'finished_cb'}->();
1559 package Amanda::Taper::Scribe::DevHandling;
1560 use Amanda::MainLoop;
1563 # This class handles scanning for volumes, requesting permission for those
1564 # volumes (the driver likes to feel like it's in control), and providing those
1565 # volumes to the scribe on request. These can all happen independently, but
1566 # the scribe cannot begin writing to a volume until all three have finished.
1567 # That is: the scan is finished, the driver has given its permission, and the
1568 # scribe has requested a volume.
1570 # On start, the class starts scanning immediately, even though the scribe has
1571 # not requested a volume. Subsequently, a new scan does not begin until the
1572 # scribe requests a volume.
1574 # This class is "private" to Amanda::Taper::Scribe, so it is documented in
1575 # comments, rather than POD.
1577 # Create a new DevHandling object. Params are taperscan and feedback.
1583 taperscan => $params{'taperscan'},
1584 feedback => $params{'feedback'},
1586 # is a scan currently running, or completed?
1589 scan_error => undef,
1592 reservation => undef,
1594 volume_label => undef,
1596 # requests for permissiont to use a new volume
1597 request_pending => 0,
1598 request_complete => 0,
1599 request_denied => 0,
1600 config_denial_message => undef,
1601 error_denial_message => undef,
1603 volume_cb => undef, # callback for get_volume
1604 start_finished_cb => undef, # callback for start
1607 return bless ($self, $class);
1612 # Called at scribe startup, this starts the instance off with a scan.
1617 $self->{'start_finished_cb'} = $params{'finished_cb'};
1618 $self->_start_scanning();
1625 for my $rq_param qw(finished_cb) {
1626 croak "required parameter '$rq_param' mising"
1627 unless exists $params{$rq_param};
1630 # since there's little other option than to barrel on through the
1631 # quitting procedure, quit() just accumulates its error messages
1632 # and, if necessary, concantenates them for the finished_cb.
1635 my $cleanup_cb = make_cb(cleanup_cb => sub {
1637 push @errors, $error if $error;
1639 $error = join("; ", @errors) if @errors >= 1;
1641 $params{'finished_cb'}->($error);
1644 if ($self->{'reservation'}) {
1645 if ($self->{'device'}) {
1646 if (!$self->{'device'}->finish()) {
1647 push @errors, $self->{'device'}->error_or_status();
1651 $self->{'reservation'}->release(finished_cb => $cleanup_cb);
1653 $cleanup_cb->(undef);
1657 # Get an open, started device and label to start writing to. The
1658 # volume_callback takes the following arguments:
1659 # $scan_error -- error message, or undef if no error occurred
1660 # $config_denial_reason -- config-related reason request was denied, or undef
1661 # $error_denial_reason -- error-related reason request was denied, or undef
1662 # $reservation -- Amanda::Changer reservation
1663 # $device -- open, started device
1664 # It is the responsibility of the caller to close the device and release the
1665 # reservation when finished. If $scan_error or $request_denied_info are
1666 # defined, then $reservation and $device will be undef.
1671 die "already processing a volume request"
1672 if ($self->{'volume_cb'});
1674 $self->{'volume_cb'} = $params{'volume_cb'};
1676 # kick off the relevant processes, if they're not already running
1677 $self->_start_request();
1679 $self->_maybe_callback();
1682 # take a peek at the device we have, for which permission has not yet been
1683 # granted. This will be undefined before the taperscan completes AND after
1684 # the volume_cb has been called.
1688 return $self->{'device'};
1694 if (!$self->{'scan_running'} && !$self->{'reservation'}) {
1695 $self->_start_scanning();
1701 sub _start_scanning {
1704 return if $self->{'scan_running'} or $self->{'scan_finished'};
1706 $self->{'scan_running'} = 1;
1708 my $_user_msg_fn = sub {
1710 if (exists($params{'slot_result'})) {
1711 if ($params{'does_not_match_labelstr'}) {
1712 $self->{'feedback'}->scribe_notif_log_info(
1713 message => "Slot $params{'slot'} with label $params{'label'} do not match labelstr");
1714 } elsif ($params{'not_in_tapelist'}) {
1715 $self->{'feedback'}->scribe_notif_log_info(
1716 message => "Slot $params{'slot'} with label $params{'label'} is not in the tapelist");
1717 } elsif ($params{'active'}) {
1718 $self->{'feedback'}->scribe_notif_log_info(
1719 message => "Slot $params{'slot'} with label $params{'label'} is not reusable");
1720 } elsif ($params{'not_autolabel'}) {
1721 if ($params{'label'}) {
1722 $self->{'feedback'}->scribe_notif_log_info(
1723 message => "Slot $params{'slot'} with label $params{'label'} is not labelable ");
1725 $self->{'feedback'}->scribe_notif_log_info(
1726 message => "Slot $params{'slot'} without label is not labelable ");
1728 } elsif ($params{'empty'}) {
1729 $self->{'feedback'}->scribe_notif_log_info(
1730 message => "Slot $params{'slot'} is empty");
1731 } elsif ($params{'non_amanda'}) {
1732 $self->{'feedback'}->scribe_notif_log_info(
1733 message => "Slot $params{'slot'} is a non-amanda volume");
1734 } elsif ($params{'volume_error'}) {
1735 $self->{'feedback'}->scribe_notif_log_info(
1736 message => "Slot $params{'slot'} is a volume in error: $params{'err'}");
1737 } elsif ($params{'not_success'}) {
1738 $self->{'feedback'}->scribe_notif_log_info(
1739 message => "Slot $params{'slot'} is a device in error: $params{'err'}");
1740 } elsif ($params{'err'}) {
1741 $self->{'feedback'}->scribe_notif_log_info(
1742 message => "$params{'err'}");
1743 } elsif ($params{'not_labelable'}) {
1744 $self->{'feedback'}->scribe_notif_log_info(
1745 message => "Slot $params{'slot'} without label can't be labeled");
1746 } elsif (!defined $params{'label'}) {
1747 $self->{'feedback'}->scribe_notif_log_info(
1748 message => "Slot $params{'slot'} without label can be labeled");
1750 $self->{'feedback'}->scribe_notif_log_info(
1751 message => "Slot $params{'slot'} with label $params{'label'} is usable");
1756 $self->{'taperscan'}->scan(
1757 user_msg_fn => $_user_msg_fn,
1759 my ($error, $reservation, $volume_label, $access_mode, $is_new) = @_;
1761 $self->{'scan_running'} = 0;
1762 $self->{'scan_finished'} = 1;
1765 $self->{'scan_error'} = $error;
1767 $self->{'reservation'} = $reservation;
1768 $self->{'device'} = $reservation->{'device'};
1769 $self->{'volume_label'} = $volume_label;
1770 $self->{'access_mode'} = $access_mode;
1771 $self->{'is_new'} = $is_new;
1774 $self->_maybe_callback();
1778 sub _start_request {
1781 return if $self->{'request_pending'} or $self->{'request_complete'};
1783 $self->{'request_pending'} = 1;
1785 $self->{'feedback'}->request_volume_permission(
1789 $self->{'request_pending'} = 0;
1790 $self->{'request_complete'} = 1;
1791 if (defined $params{'scribe'}) {
1792 $self->{'new_scribe'} = $params{'scribe'};
1793 $self->{'scan_finished'} = 1;
1794 $self->{'request_complete'} = 1;
1795 } elsif (defined $params{'cause'}) {
1796 $self->{'request_denied'} = 1;
1797 if ($params{'cause'} eq 'config') {
1798 $self->{'config_denial_message'} = $params{'message'};
1799 } elsif ($params{'cause'} eq 'error') {
1800 $self->{'error_denial_message'} = $params{'message'};
1802 die "bad cause '" . $params{'cause'} . "'";
1804 } elsif (!defined $params{'allow'}) {
1805 die "no allow or cause defined";
1808 $self->_maybe_callback();
1812 sub _maybe_callback {
1815 # if we have any kind of error, release the reservation and come back
1817 if (($self->{'scan_error'} or $self->{'request_denied'}) and $self->{'reservation'}) {
1818 $self->{'device'} = undef;
1820 $self->{'reservation'}->release(finished_cb => sub {
1823 # so many errors, so little time..
1825 if ($self->{'scan_error'}) {
1826 warning("ignoring error releasing reservation ($error) after a scan error");
1828 $self->{'scan_error'} = $error;
1832 $self->{'reservation'} = undef;
1833 $self->_maybe_callback();
1839 # if we are just starting up, call the finished_cb given to start()
1840 if (defined $self->{'start_finished_cb'} and $self->{'scan_finished'}) {
1841 my $cb = $self->{'start_finished_cb'};
1842 $self->{'start_finished_cb'} = undef;
1844 $cb->($self->{'scan_error'});
1847 # if the volume_cb is good to get called, call it and reset to the ground state
1848 if ($self->{'volume_cb'} and (!$self->{'scan_running'} or $self->{'scan_finished'}) and $self->{'request_complete'}) {
1849 # get the cb and its arguments lined up before calling it..
1850 my $volume_cb = $self->{'volume_cb'};
1851 my @volume_cb_args = (
1852 $self->{'scan_error'},
1853 $self->{'config_denial_message'},
1854 $self->{'error_denial_message'},
1855 $self->{'reservation'},
1856 $self->{'volume_label'},
1857 $self->{'access_mode'},
1859 $self->{'new_scribe'},
1862 # reset everything and prepare for a new scan
1863 $self->{'scan_finished'} = 0;
1865 $self->{'reservation'} = undef;
1866 $self->{'device'} = undef;
1867 $self->{'volume_label'} = undef;
1869 $self->{'request_complete'} = 0;
1870 $self->{'request_denied'} = 0;
1871 $self->{'config_denial_message'} = undef;
1872 $self->{'error_denial_message'} = undef;
1873 $self->{'volume_cb'} = undef;
1874 $self->{'new_scribe'} = undef;
1876 $volume_cb->(@volume_cb_args);