On Thu, 17 Mar 2016, Joe Thornber wrote:
> If you're skipping the mappings does the new thin_ls provide enough
> information for you?
Our primary need is the ability to specify --device-id in the o:L:d output
format (old_format.cc) with mappings. Our nightly dumps now take 50
seconds instead of 40 minutes since we only dump the dev_id's that we
need.
As for thin_ls, we're still in the 0.5.x branch, I couldn't get 0.6.x to
build on el7:
# git checkout v0.6.2-rc6
Previous HEAD position was e46bdfd... v0.6.1
HEAD is now at afb71d8... bump version
# ./configure
[...]
# make
[CXX] base/application.cc
g++: error: @LFS_FLAGS@: No such file or directory
make: *** [base/application.o] Error 1
Am I missing something trivial here?
--
Eric Wheeler
>
> - Joe
>
> On Tue, Mar 15, 2016 at 01:45:15AM +0000, Eric Wheeler wrote:
> > Hi Joe,
> >
> > Please review the patch below when you have a moment. I am interested in
> > your feedback, and also interested in having this functionality merged
> > upstream. This was written against thin-provisioning-tools.git tag
> > v0.5.6.
> >
> > We use thin_dump on live dm-thin metadata snapshots all the time. In our
> > case, we want to dump the XML for new (snapshot) volumes instead of
> > dumping the entire 16gb metadata device (37.8% used) which takes ~20-30
> > minutes instead of ~5 seconds for a single volume with --device-id.
> >
> > I started by adding --device-id to pass the `block_address dev_id` and
> > skip the call to emit_mappings() within mapping_tree_emitter::visit()
> > unless the dev_id matches --device-id as passed to thin_dump.
> >
> > It is sometimes nice to list all of the device supers without waiting for
> > emit_mappings() so I added the --skip-mappings option. This allows you to
> > get the dev_id without reading the mappings:
> > thin_dump --skip-mappings -m /dev/mapper/vg-p_tmeta
> >
> > Like `bool repair`, I added skip_mappings and dev_id as arguments to
> > thin_provisioning::metadata_dump() and passed them down to
> > mapping_tree_emitter with new members set_skip_mappings() and set_dev_id()
> > to set private attributes (default values are assigned in
> > metadata_dumper.h in case of backward compatible calls).
> >
> > We work with the device metadata in a simplified format, and without
> > superblock information:
> >
> > origin_offset:length:tdata_offset (hence, "o:L:d" or "old")
> >
> > Therefore, the output --format 'old' was added. I added the format 'null'
> > as well for benchmarking purposes so the ostream needn't write large
> > volumes of text to /dev/null.
> >
> > Benchmarks of the various formats on our sample metadata snapshot on an
> > idle machine:
> >
> > for i in xml human_readable old null; do
> > time thin_dump -m -f $i /dev/mapper/vg-p_tmeta -o /dev/null
> > done
> >
> > real user sys
> > xml 29:01.27 25:35.87 01:54.49
> > human 27:39.81 24:12.90 01:52.39
> > old 27:07.71 23:40.64 01:52.97
> > null 23:39.38 21:17.22 00:49.04
> >
> > I have this as a branch in bitbucket if you prefer to see it online:
> >
> > https://bitbucket.org/ewheelerinc/thin-provisioning-tools/branch/v0.5.6-device-id
> > or
> > git pull https://bitbucket.org/ewheelerinc/thin-provisioning-tools.git
> > v0.5.6-device-id
> >
> >
> > --
> > Eric Wheeler
> >
> >
> > diff --git a/thin-provisioning/thin_dump.cc b/thin-provisioning/thin_dump.cc
> > index 191acb5..7df5d85 100644
> > --- a/thin-provisioning/thin_dump.cc
> > +++ b/thin-provisioning/thin_dump.cc
> > @@ -22,6 +22,8 @@
> > #include <libgen.h>
> >
> > #include "human_readable_format.h"
> > +#include "old_format.h"
> > +#include "null_format.h"
> > #include "metadata_dumper.h"
> > #include "metadata.h"
> > #include "xml_format.h"
> > @@ -36,6 +38,8 @@ using namespace thin_provisioning;
> > struct flags {
> > bool find_metadata_snap;
> > bool repair;
> > + block_address dev_id;
> > + bool skip_mappings;
> > };
> >
> > namespace {
> > @@ -49,12 +53,16 @@ namespace {
> > e = create_xml_emitter(out);
> > else if (format == "human_readable")
> > e = create_human_readable_emitter(out);
> > + else if (format == "old")
> > + e = create_old_emitter(out);
> > + else if (format == "null")
> > + e = create_null_emitter(out);
> > else {
> > cerr << "unknown format '" << format << "'" <<
> > endl;
> > exit(1);
> > }
> >
> > - metadata_dump(md, e, flags.repair);
> > + metadata_dump(md, e, flags.repair, flags.skip_mappings,
> > flags.dev_id);
> >
> > } catch (std::exception &e) {
> > cerr << e.what() << endl;
> > @@ -77,10 +85,12 @@ namespace {
> > out << "Usage: " << cmd << " [options] {device|file}" << endl
> > << "Options:" << endl
> > << " {-h|--help}" << endl
> > - << " {-f|--format} {xml|human_readable}" << endl
> > + << " {-f|--format} {xml|human_readable|old|null}" << endl
> > << " {-r|--repair}" << endl
> > << " {-m|--metadata-snap} [block#]" << endl
> > << " {-o <xml file>}" << endl
> > + << " {-d device_id}" << endl
> > + << " {-s|--skip-mappings}" << endl
> > << " {-V|--version}" << endl;
> > }
> > }
> > @@ -89,17 +99,20 @@ int thin_dump_main(int argc, char **argv)
> > {
> > int c;
> > char const *output = NULL;
> > - const char shortopts[] = "hm::o:f:rV";
> > + const char shortopts[] = "hm::o:sd:f:rV";
> > char *end_ptr;
> > string format = "xml";
> > block_address metadata_snap = 0;
> > struct flags flags;
> > - flags.find_metadata_snap = flags.repair = false;
> > + flags.find_metadata_snap = flags.repair = flags.skip_mappings = false;
> > + flags.dev_id = -1;
> >
> > const struct option longopts[] = {
> > { "help", no_argument, NULL, 'h'},
> > { "metadata-snap", optional_argument, NULL, 'm' },
> > { "output", required_argument, NULL, 'o'},
> > + { "skip-mappings", no_argument, NULL, 's'},
> > + { "device-id", required_argument, NULL, 'd'},
> > { "format", required_argument, NULL, 'f' },
> > { "repair", no_argument, NULL, 'r'},
> > { "version", no_argument, NULL, 'V'},
> > @@ -120,6 +133,19 @@ int thin_dump_main(int argc, char **argv)
> > flags.repair = true;
> > break;
> >
> > + case 's':
> > + flags.skip_mappings = true;
> > + break;
> > +
> > + case 'd':
> > + flags.dev_id = strtoull(optarg, &end_ptr, 10);
> > + if (end_ptr == optarg) {
> > + cerr << "couldn't parse <device_id>" << endl;
> > + usage(cerr, basename(argv[0]));
> > + return 1;
> > + }
> > + break;
> > +
> > case 'm':
> > if (optarg) {
> > metadata_snap = strtoull(optarg, &end_ptr, 10);
> > @@ -147,6 +173,12 @@ int thin_dump_main(int argc, char **argv)
> > }
> > }
> >
> > + if (format != "old" && flags.dev_id < 0) {
> > + cerr << "Output format 'old' must specify --device-id" << endl;
> > + return 1;
> > + }
> > +
> > +
> > if (argc == optind) {
> > cerr << "No input file provided." << endl;
> > usage(cerr, basename(argv[0]));
> > diff --git a/thin-provisioning/metadata_dumper.h
> > b/thin-provisioning/metadata_dumper.h
> > index c96d22e..9d9814e 100644
> > --- a/thin-provisioning/metadata_dumper.h
> > +++ b/thin-provisioning/metadata_dumper.h
> > @@ -28,7 +28,7 @@ namespace thin_provisioning {
> > // Set the @repair flag if your metadata is corrupt, and you'd like
> > // the dumper to do it's best to recover info. If not set, any
> > // corruption encountered will cause an exception to be thrown.
> > - void metadata_dump(metadata::ptr md, emitter::ptr e, bool repair);
> > + void metadata_dump(metadata::ptr md, emitter::ptr e, bool repair, bool
> > skip_mappings = false, block_address dev_id = -1);
> > }
> >
> > //----------------------------------------------------------------
> > diff --git a/thin-provisioning/metadata_dumper.cc
> > b/thin-provisioning/metadata_dumper.cc
> > index db656ee..55cbae8 100644
> > --- a/thin-provisioning/metadata_dumper.cc
> > +++ b/thin-provisioning/metadata_dumper.cc
> > @@ -171,23 +171,31 @@ namespace {
> > dd_(dd),
> > repair_(repair),
> > damage_policy_(damage_policy) {
> > + dev_id_ = -1;
> > + skip_mappings_ = false;
> > }
> >
> > + void set_dev_id(block_address dev_id) { dev_id_ = dev_id; }
> > + void set_skip_mappings(bool skip) { skip_mappings_ = skip; }
> > +
> > void visit(btree_path const &path, block_address tree_root) {
> > block_address dev_id = path[0];
> >
> > dd_map::const_iterator it = dd_.find(path[0]);
> > if (it != dd_.end()) {
> > device_tree_detail::device_details const &d =
> > it->second;
> > - e_->begin_device(dev_id,
> > - d.mapped_blocks_,
> > - d.transaction_id_,
> > - d.creation_time_,
> > - d.snapshotted_time_);
> > + if (dev_id_ == -1UL || dev_id == dev_id_) {
> > + e_->begin_device(dev_id,
> > + d.mapped_blocks_,
> > + d.transaction_id_,
> > + d.creation_time_,
> > + d.snapshotted_time_);
> >
> > - emit_mappings(tree_root);
> > + if (!skip_mappings_)
> > + emit_mappings(tree_root);
> >
> > - e_->end_device();
> > + e_->end_device();
> > + }
> >
> > } else if (!repair_) {
> > ostringstream msg;
> > @@ -209,6 +217,8 @@ namespace {
> > emitter::ptr e_;
> > dd_map const &dd_;
> > bool repair_;
> > + block_address dev_id_;
> > + bool skip_mappings_;
> > mapping_tree_detail::damage_visitor::ptr damage_policy_;
> > };
> > }
> > @@ -216,7 +226,7 @@ namespace {
> > //----------------------------------------------------------------
> >
> > void
> > -thin_provisioning::metadata_dump(metadata::ptr md, emitter::ptr e, bool
> > repair)
> > +thin_provisioning::metadata_dump(metadata::ptr md, emitter::ptr e, bool
> > repair, bool skip_mappings, block_address dev_id)
> > {
> > details_extractor de;
> > device_tree_detail::damage_visitor::ptr
> > dd_policy(details_damage_policy(repair));
> > @@ -231,6 +241,11 @@ thin_provisioning::metadata_dump(metadata::ptr md,
> > emitter::ptr e, bool repair)
> > {
> > mapping_tree_detail::damage_visitor::ptr
> > md_policy(mapping_damage_policy(repair));
> > mapping_tree_emitter mte(md, e, de.get_details(), repair,
> > mapping_damage_policy(repair));
> > +
> > + mte.set_skip_mappings(skip_mappings);
> > +
> > + if (dev_id >= 0)
> > + mte.set_dev_id(dev_id);
> > walk_mapping_tree(*md->mappings_top_level_, mte, *md_policy);
> > }
> >
> > diff --git a/man8/thin_dump.8 b/man8/thin_dump.8
> > index 7a9f785..9e0bf9e 100644
> > --- a/man8/thin_dump.8
> > +++ b/man8/thin_dump.8
> > @@ -26,9 +26,19 @@ in order to put it back onto a metadata
> >
> > This tool cannot be run on live metadata unless the
> > \fB\-\-metadata\-snap\fP option is used.
> >
> > -.IP "\fB\-f, \-\-format\fP \fI{xml|human_readable}\fP".
> > +.IP "\fB\-f, \-\-format\fP \fI{xml|human_readable|old|null}\fP".
> > Print output in XML or human readable format.
> > -
> > +.sp
> > +The
> > +.B old
> > +format requires the --device-id option and emits in the
> > +following format, one record per line:
> > +.B offset:length:tdata_offset
> > +(hence, "o:L:d") with units in bytes.
> > +.sp
> > +The
> > +.B null
> > +format emits nothing and only walks the tree.
> > .IP "\fB\-r, \-\-repair\fP".
> > Repair the metadata whilst dumping it.
> >
> > @@ -39,6 +49,17 @@ the thin provisioning device-mapper target, else try the
> > one at block#.
> > See the thin provisioning target documentation on how to create or release
> > a metadata snapshot and retrieve the block number from the kernel.
> >
> > +.IP "\fB\-d, \-\-skip\-mappings\fP".
> > +Skip emission of the mappings. This outputs nothing if format is
> > +either of
> > +.B old
> > +or
> > +.B null
> > +.
> > +
> > +.IP "\fB\-d, \-\-device\-id\fP".
> > +Specify the device_id to be dumped.
> > +
> > .IP "\fB\-h, \-\-help\fP".
> > Print help and exit.
> >
> > diff --git a/Makefile.in b/Makefile.in
> > index e67b300..078bb53 100644
> > --- a/Makefile.in
> > +++ b/Makefile.in
> > @@ -73,6 +73,8 @@ SOURCE=\
> > persistent-data/validators.cc \
> > thin-provisioning/device_tree.cc \
> > thin-provisioning/human_readable_format.cc \
> > + thin-provisioning/old_format.cc \
> > + thin-provisioning/null_format.cc \
> > thin-provisioning/mapping_tree.cc \
> > thin-provisioning/metadata.cc \
> > thin-provisioning/metadata_checker.cc \
> > diff --git a/thin-provisioning/old_format.h b/thin-provisioning/old_format.h
> > new file mode 100644
> > index 0000000..dba69e9
> > --- /dev/null
> > +++ b/thin-provisioning/old_format.h
> > @@ -0,0 +1,34 @@
> > +// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
> > +//
> > +// This file is part of the thin-provisioning-tools source.
> > +//
> > +// thin-provisioning-tools is free software: you can redistribute it
> > +// and/or modify it under the terms of the GNU General Public License
> > +// as published by the Free Software Foundation, either version 3 of
> > +// the License, or (at your option) any later version.
> > +//
> > +// thin-provisioning-tools is distributed in the hope that it will be
> > +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
> > +// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > +// GNU General Public License for more details.
> > +//
> > +// You should have received a copy of the GNU General Public License along
> > +// with thin-provisioning-tools. If not, see
> > +// <http://www.gnu.org/licenses/>.
> > +
> > +#ifndef OLD_FORMAT_H
> > +#define OLD_FORMAT_H
> > +
> > +#include "emitter.h"
> > +
> > +#include <iosfwd>
> > +
> > +//----------------------------------------------------------------
> > +
> > +namespace thin_provisioning {
> > + emitter::ptr create_old_emitter(std::ostream &out);
> > +}
> > +
> > +//----------------------------------------------------------------
> > +
> > +#endif
> > diff --git a/thin-provisioning/old_format.cc
> > b/thin-provisioning/old_format.cc
> > new file mode 100644
> > index 0000000..52056c8
> > --- /dev/null
> > +++ b/thin-provisioning/old_format.cc
> > @@ -0,0 +1,103 @@
> > +// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
> > +//
> > +// This file is part of the thin-provisioning-tools source.
> > +//
> > +// thin-provisioning-tools is free software: you can redistribute it
> > +// and/or modify it under the terms of the GNU General Public License
> > +// as published by the Free Software Foundation, either version 3 of
> > +// the License, or (at your option) any later version.
> > +//
> > +// thin-provisioning-tools is distributed in the hope that it will be
> > +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
> > +// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > +// GNU General Public License for more details.
> > +//
> > +// You should have received a copy of the GNU General Public License along
> > +// with thin-provisioning-tools. If not, see
> > +// <http://www.gnu.org/licenses/>.
> > +
> > +#include "old_format.h"
> > +
> > +#include <iostream>
> > +#include <boost/format.hpp>
> > +
> > +using namespace std;
> > +using namespace thin_provisioning;
> > +
> > +//----------------------------------------------------------------
> > +
> > +namespace {
> > + template <typename T>
> > + std::ostream &operator << (ostream &out, boost::optional<T> const
> > &maybe) {
> > + if (maybe)
> > + out << *maybe;
> > +
> > + return out;
> > + }
> > +
> > + class old_emitter : public emitter {
> > + public:
> > + old_emitter(ostream &out)
> > + : out_(out) {
> > + }
> > +
> > + void begin_superblock(string const &uuid,
> > + uint64_t time,
> > + uint64_t trans_id,
> > + uint32_t data_block_size,
> > + uint64_t nr_data_blocks,
> > + boost::optional<uint64_t> metadata_snap) {
> > + data_block_size_ = data_block_size;
> > + }
> > +
> > + void end_superblock() {
> > + }
> > +
> > + void begin_device(uint32_t dev_id,
> > + uint64_t mapped_blocks,
> > + uint64_t trans_id,
> > + uint64_t creation_time,
> > + uint64_t snap_time) {
> > + }
> > +
> > + void end_device() {
> > + }
> > +
> > + void begin_named_mapping(string const &name) {
> > + }
> > +
> > + void end_named_mapping() {
> > + }
> > +
> > + void identifier(string const &name) {
> > + }
> > +
> > + void range_map(uint64_t origin_begin, uint64_t data_begin,
> > uint32_t time, uint64_t len) {
> > + out_ << (data_block_size_ << 9)*origin_begin
> > + << ":" << (data_block_size_ << 9)*len
> > + << ":" << (data_block_size_ << 9)*data_begin
> > + << endl;
> > + }
> > +
> > + void single_map(uint64_t origin_block, uint64_t data_block,
> > uint32_t time) {
> > + out_ << (data_block_size_ << 9)*origin_block
> > + << ":" << (data_block_size_ << 9)
> > + << ":" << (data_block_size_ << 9)*data_block
> > + << endl;
> > + }
> > +
> > + private:
> > + ostream &out_;
> > + uint64_t data_block_size_;
> > + };
> > +}
> > +
> > +//----------------------------------------------------------------
> > +
> > +thin_provisioning::emitter::ptr
> > +thin_provisioning::create_old_emitter(ostream &out)
> > +{
> > + return emitter::ptr(new old_emitter(out));
> > +}
> > +
> > +//----------------------------------------------------------------
> > diff --git a/thin-provisioning/null_format.h
> > b/thin-provisioning/null_format.h
> > new file mode 100644
> > index 0000000..2688762
> > --- /dev/null
> > +++ b/thin-provisioning/null_format.h
> > @@ -0,0 +1,34 @@
> > +// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
> > +//
> > +// This file is part of the thin-provisioning-tools source.
> > +//
> > +// thin-provisioning-tools is free software: you can redistribute it
> > +// and/or modify it under the terms of the GNU General Public License
> > +// as published by the Free Software Foundation, either version 3 of
> > +// the License, or (at your option) any later version.
> > +//
> > +// thin-provisioning-tools is distributed in the hope that it will be
> > +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
> > +// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > +// GNU General Public License for more details.
> > +//
> > +// You should have received a copy of the GNU General Public License along
> > +// with thin-provisioning-tools. If not, see
> > +// <http://www.gnu.org/licenses/>.
> > +
> > +#ifndef NULL_FORMAT_H
> > +#define NULL_FORMAT_H
> > +
> > +#include "emitter.h"
> > +
> > +#include <iosfwd>
> > +
> > +//----------------------------------------------------------------
> > +
> > +namespace thin_provisioning {
> > + emitter::ptr create_null_emitter(std::ostream &out);
> > +}
> > +
> > +//----------------------------------------------------------------
> > +
> > +#endif
> > diff --git a/thin-provisioning/null_format.cc
> > b/thin-provisioning/null_format.cc
> > new file mode 100644
> > index 0000000..b1baa7d
> > --- /dev/null
> > +++ b/thin-provisioning/null_format.cc
> > @@ -0,0 +1,92 @@
> > +// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
> > +//
> > +// This file is part of the thin-provisioning-tools source.
> > +//
> > +// thin-provisioning-tools is free software: you can redistribute it
> > +// and/or modify it under the terms of the GNU General Public License
> > +// as published by the Free Software Foundation, either version 3 of
> > +// the License, or (at your option) any later version.
> > +//
> > +// thin-provisioning-tools is distributed in the hope that it will be
> > +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
> > +// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > +// GNU General Public License for more details.
> > +//
> > +// You should have received a copy of the GNU General Public License along
> > +// with thin-provisioning-tools. If not, see
> > +// <http://www.gnu.org/licenses/>.
> > +
> > +#include "null_format.h"
> > +
> > +#include <iostream>
> > +
> > +using namespace std;
> > +using namespace thin_provisioning;
> > +
> > +//----------------------------------------------------------------
> > +
> > +namespace {
> > + template <typename T>
> > + std::ostream &operator << (ostream &out, boost::optional<T> const
> > &maybe) {
> > + if (maybe)
> > + out << *maybe;
> > +
> > + return out;
> > + }
> > +
> > + class null_emitter : public emitter {
> > + public:
> > + null_emitter(ostream &out)
> > + : out_(out) {
> > + }
> > +
> > + void begin_superblock(string const &uuid,
> > + uint64_t time,
> > + uint64_t trans_id,
> > + uint32_t data_block_size,
> > + uint64_t nr_data_blocks,
> > + boost::optional<uint64_t> metadata_snap) {
> > + }
> > +
> > + void end_superblock() {
> > + }
> > +
> > + void begin_device(uint32_t dev_id,
> > + uint64_t mapped_blocks,
> > + uint64_t trans_id,
> > + uint64_t creation_time,
> > + uint64_t snap_time) {
> > + }
> > +
> > + void end_device() {
> > + }
> > +
> > + void begin_named_mapping(string const &name) {
> > + }
> > +
> > + void end_named_mapping() {
> > + }
> > +
> > + void identifier(string const &name) {
> > + }
> > +
> > + void range_map(uint64_t origin_begin, uint64_t data_begin,
> > uint32_t time, uint64_t len) {
> > + }
> > +
> > + void single_map(uint64_t origin_block, uint64_t data_block,
> > uint32_t time) {
> > + }
> > +
> > + private:
> > + ostream &out_;
> > + };
> > +}
> > +
> > +//----------------------------------------------------------------
> > +
> > +thin_provisioning::emitter::ptr
> > +thin_provisioning::create_null_emitter(ostream &out)
> > +{
> > + return emitter::ptr(new null_emitter(out));
> > +}
> > +
> > +//----------------------------------------------------------------
> > diff --git a/thin-provisioning/null_format.h
> > b/thin-provisioning/null_format.h
> > new file mode 100644
> > index 0000000..2688762
> > --- /dev/null
> > +++ b/thin-provisioning/null_format.h
> > @@ -0,0 +1,34 @@
> > +// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
> > +//
> > +// This file is part of the thin-provisioning-tools source.
> > +//
> > +// thin-provisioning-tools is free software: you can redistribute it
> > +// and/or modify it under the terms of the GNU General Public License
> > +// as published by the Free Software Foundation, either version 3 of
> > +// the License, or (at your option) any later version.
> > +//
> > +// thin-provisioning-tools is distributed in the hope that it will be
> > +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
> > +// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > +// GNU General Public License for more details.
> > +//
> > +// You should have received a copy of the GNU General Public License along
> > +// with thin-provisioning-tools. If not, see
> > +// <http://www.gnu.org/licenses/>.
> > +
> > +#ifndef NULL_FORMAT_H
> > +#define NULL_FORMAT_H
> > +
> > +#include "emitter.h"
> > +
> > +#include <iosfwd>
> > +
> > +//----------------------------------------------------------------
> > +
> > +namespace thin_provisioning {
> > + emitter::ptr create_null_emitter(std::ostream &out);
> > +}
> > +
> > +//----------------------------------------------------------------
> > +
> > +#endif
> > diff --git a/thin-provisioning/null_format.cc
> > b/thin-provisioning/null_format.cc
> > new file mode 100644
> > index 0000000..b1baa7d
> > --- /dev/null
> > +++ b/thin-provisioning/null_format.cc
> > @@ -0,0 +1,92 @@
> > +// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
> > +//
> > +// This file is part of the thin-provisioning-tools source.
> > +//
> > +// thin-provisioning-tools is free software: you can redistribute it
> > +// and/or modify it under the terms of the GNU General Public License
> > +// as published by the Free Software Foundation, either version 3 of
> > +// the License, or (at your option) any later version.
> > +//
> > +// thin-provisioning-tools is distributed in the hope that it will be
> > +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
> > +// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > +// GNU General Public License for more details.
> > +//
> > +// You should have received a copy of the GNU General Public License along
> > +// with thin-provisioning-tools. If not, see
> > +// <http://www.gnu.org/licenses/>.
> > +
> > +#include "null_format.h"
> > +
> > +#include <iostream>
> > +
> > +using namespace std;
> > +using namespace thin_provisioning;
> > +
> > +//----------------------------------------------------------------
> > +
> > +namespace {
> > + template <typename T>
> > + std::ostream &operator << (ostream &out, boost::optional<T> const
> > &maybe) {
> > + if (maybe)
> > + out << *maybe;
> > +
> > + return out;
> > + }
> > +
> > + class null_emitter : public emitter {
> > + public:
> > + null_emitter(ostream &out)
> > + : out_(out) {
> > + }
> > +
> > + void begin_superblock(string const &uuid,
> > + uint64_t time,
> > + uint64_t trans_id,
> > + uint32_t data_block_size,
> > + uint64_t nr_data_blocks,
> > + boost::optional<uint64_t> metadata_snap) {
> > + }
> > +
> > + void end_superblock() {
> > + }
> > +
> > + void begin_device(uint32_t dev_id,
> > + uint64_t mapped_blocks,
> > + uint64_t trans_id,
> > + uint64_t creation_time,
> > + uint64_t snap_time) {
> > + }
> > +
> > + void end_device() {
> > + }
> > +
> > + void begin_named_mapping(string const &name) {
> > + }
> > +
> > + void end_named_mapping() {
> > + }
> > +
> > + void identifier(string const &name) {
> > + }
> > +
> > + void range_map(uint64_t origin_begin, uint64_t data_begin,
> > uint32_t time, uint64_t len) {
> > + }
> > +
> > + void single_map(uint64_t origin_block, uint64_t data_block,
> > uint32_t time) {
> > + }
> > +
> > + private:
> > + ostream &out_;
> > + };
> > +}
> > +
> > +//----------------------------------------------------------------
> > +
> > +thin_provisioning::emitter::ptr
> > +thin_provisioning::create_null_emitter(ostream &out)
> > +{
> > + return emitter::ptr(new null_emitter(out));
> > +}
> > +
> > +//----------------------------------------------------------------
> >
>
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