Merge branch 'master' into v0.7-devel

Conflicts:
	VERSION
	persistent-data/space-maps/disk.cc
	persistent-data/space-maps/disk.h

README.md

@@ -130,3 +130,28 @@ Once you've done this you can run the tests with a simple:
 Or specific tests with:
 
     cucumber features/thin_restore -n 'print help'
+
+
+Dump Metadata
+=============
+
+To dump the metadata of a live thin pool, you must first create a snapshot of
+the metadata:
+
+	$ dmsetup message vg001-mythinpool-tpool 0 reserve_metadata_snap
+
+Extract the metadata:
+
+	$ sudo bin/thin_dump -m /dev/mapper/vg001-mythinpool_tmeta
+	<superblock uuid="" time="1" transaction="2" data_block_size="128"nr_data_blocks="0">
+	    <device dev_id="1" mapped_blocks="1" transaction="0" creation_time="0" snap_time="1">
+	        <single_mapping origin_block="0" data_block="0" time="0"/>
+	    </device>
+	    <device dev_id="2" mapped_blocks="1" transaction="1" creation_time="1" snap_time="1">
+	        <single_mapping origin_block="0" data_block="0" time="0"/>
+	    </device>
+	</superblock>
+
+Finally, release the root:
+
+	$ dmsetup message vg001-mythinpool-tpool 0 release_metadata_snap

man8/thin_ls.8

@@ -19,8 +19,8 @@ This tool cannot be run on live metadata unless the \fB\-\-metadata\-snap\fP opt
 .IP "\fB\-o, \-\-format\fP"
 Give a comma separated list of the fields to be output.  Valid fields are:
 DEV, MAPPED_BLOCKS, EXCLUSIVE_BLOCKS, SHARED_BLOCKS, MAPPED_SECTORS,
-EXCLUSIVE_SECTORS, SHARED_SECTORS, MAPPED, EXCLUSIVE, SHARED, TRANSACTION
-CREATE_TIME, SNAP_TIME
+EXCLUSIVE_SECTORS, SHARED_SECTORS, MAPPED_BYTES, EXCLUSIVE_BYTES,
+SHARED_BYTES, MAPPED, EXCLUSIVE, SHARED, TRANSACTION CREATE_TIME, SNAP_TIME
 
 .IP "\fB\-\-no\-headers\fP"
 Don't output headers.

persistent-data/space-maps/disk.cc

@@ -794,4 +794,15 @@ persistent_data::index_validator() {
 	return bcache::validator::ptr(new index_block_validator());
 }
 
+block_address
+persistent_data::get_nr_blocks_in_data_sm(transaction_manager &tm, void *root)
+{
+	sm_root_disk d;
+	sm_root v;
+
+	::memcpy(&d, root, sizeof(d));
+	sm_root_traits::unpack(d, v);
+	return v.nr_blocks_;
+}
+
 //----------------------------------------------------------------

persistent-data/space-maps/disk.h

@@ -37,11 +37,14 @@ namespace persistent_data {
 	checked_space_map::ptr
 	open_metadata_sm(transaction_manager &tm, void *root);
 
-	bcache::validator::ptr
-	bitmap_validator();
+	bcache::validator::ptr bitmap_validator();
 
-	bcache::validator::ptr
-	index_validator();
+	bcache::validator::ptr index_validator();
+
+	// Get the number of data blocks with minimal IO.  Used when
+	// repairing to avoid the bulk of the space maps.
+	block_address
+	get_nr_blocks_in_data_sm(transaction_manager &tm, void *root);
 }
 
 //----------------------------------------------------------------

thin-provisioning/metadata_dumper.cc

@@ -185,8 +185,13 @@ namespace {
 						 d.creation_time_,
 						 d.snapshotted_time_);
 
-				emit_mappings(tree_root);
-
+				try {
+					emit_mappings(tree_root);
+				} catch (exception &e) {
+					cerr << e.what();
+					e_->end_device();
+					throw;
+				}
 				e_->end_device();
 
 			} else if (!repair_) {
@@ -211,6 +216,19 @@ namespace {
 		bool repair_;
 		mapping_tree_detail::damage_visitor::ptr damage_policy_;
 	};
+
+	block_address get_nr_blocks(metadata::ptr md) {
+		if (md->data_sm_)
+			return md->data_sm_->get_nr_blocks();
+
+		else if (md->sb_.blocknr_ == superblock_detail::SUPERBLOCK_LOCATION)
+			// grab from the root structure of the space map
+			return get_nr_blocks_in_data_sm(*md->tm_, &md->sb_.data_space_map_root_);
+
+		else
+			// metadata snap, we really don't know
+			return 0ull;
+	}
 }
 
 //----------------------------------------------------------------
@@ -222,16 +240,12 @@ thin_provisioning::metadata_dump(metadata::ptr md, emitter::ptr e, bool repair)
 	device_tree_detail::damage_visitor::ptr dd_policy(details_damage_policy(repair));
 	walk_device_tree(*md->details_, de, *dd_policy);
 
-	// metadata snap doesn't have the space maps so we don't know how
-	// many data blocks there are.
-	block_address nr_data_blocks = md->data_sm_ ? md->data_sm_->get_nr_blocks() : 0;
-
 	e->begin_superblock("", md->sb_.time_,
 			    md->sb_.trans_id_,
 			    md->sb_.flags_,
 			    md->sb_.version_,
 			    md->sb_.data_block_size_,
-			    nr_data_blocks,
+			    get_nr_blocks(md),
 			    boost::optional<block_address>());
 
 	{

thin-provisioning/thin_ls.cc

@@ -109,6 +109,10 @@ namespace {
 		EXCLUSIVE_SECTORS,
 		SHARED_SECTORS,
 
+		MAPPED_BYTES,
+		EXCLUSIVE_BYTES,
+		SHARED_BYTES,
+
 		MAPPED,
 		EXCLUSIVE,
 		SHARED,
@@ -128,6 +132,10 @@ namespace {
 		"EXCLUSIVE_SECTORS",
 		"SHARED_SECTORS",
 
+		"MAPPED_BYTES",
+		"EXCLUSIVE_BYTES",
+		"SHARED_BYTES",
+
 		"MAPPED",
 		"EXCLUSIVE",
 		"SHARED",
@@ -298,6 +306,8 @@ namespace {
 			    *it == SHARED_BLOCKS ||
 			    *it == EXCLUSIVE_SECTORS ||
 			    *it == SHARED_SECTORS ||
+			    *it == EXCLUSIVE_BYTES ||
+			    *it == SHARED_BYTES ||
 			    *it == EXCLUSIVE ||
 			    *it == SHARED)
 				return true;
@@ -375,6 +385,20 @@ namespace {
 					grid.field((it->second.mapped_blocks_ - exclusive) * block_size);
 					break;
 
+				case MAPPED_BYTES:
+					grid.field(it->second.mapped_blocks_ * block_size *
+					           disk_unit_multiplier(UNIT_SECTOR));
+					break;
+
+				case EXCLUSIVE_BYTES:
+					grid.field(exclusive * block_size *
+					           disk_unit_multiplier(UNIT_SECTOR));
+					break;
+
+				case SHARED_BYTES:
+					grid.field((it->second.mapped_blocks_ - exclusive) * block_size *
+					           disk_unit_multiplier(UNIT_SECTOR));
+					break;
 
 				case MAPPED:
 					grid.field(

thin-provisioning/thin_repair.cc

@@ -23,7 +23,8 @@ namespace {
 			emitter::ptr e = create_restore_emitter(new_md);
 
 			block_manager<>::ptr old_bm = open_bm(old_path, block_manager<>::READ_ONLY);
-			metadata::ptr old_md(new metadata(old_bm, false)); // we don't need to read the space maps
+
+			metadata::ptr old_md(new metadata(old_bm, false));
 			metadata_dump(old_md, e, true);
 
 		} catch (std::exception &e) {