thin_show_blocks

.gitignore

@@ -15,6 +15,7 @@ thin_restore
 thin_repair
 thin_rmap
 thin_metadata_size
+thin_show_blocks
 
 cache_check
 cache_dump

Makefile.in

@@ -35,7 +35,8 @@ PROGRAMS=\
 	thin_restore \
 	thin_repair \
 	thin_rmap \
-	thin_metadata_size
+	thin_metadata_size \
+	thin_show_blocks
 
 all: $(PROGRAMS)
 
@@ -162,6 +163,7 @@ lib/libpdata.a: $(PDATA_OBJECTS)
 # Thin provisioning tools
 
 THIN_DEBUG_SOURCE=$(SOURCE)
+THIN_SHOW_BLOCKS_SOURCE=$(SOURCE)
 THIN_DUMP_SOURCE=$(SOURCE)
 THIN_REPAIR_SOURCE=$(SOURCE)
 THIN_RESTORE_SOURCE=$(SOURCE)
@@ -209,6 +211,7 @@ THIN_RMAP_SOURCE=\
 	thin-provisioning/superblock.cc
 
 THIN_DEBUG_OBJECTS=$(subst .cc,.o,$(THIN_DEBUG_SOURCE))
+THIN_SHOW_BLOCKS_OBJECTS=$(subst .cc,.o,$(THIN_SHOW_BLOCKS_SOURCE))
 THIN_DUMP_OBJECTS=$(subst .cc,.o,$(THIN_DUMP_SOURCE))
 THIN_REPAIR_OBJECTS=$(subst .cc,.o,$(THIN_REPAIR_SOURCE))
 THIN_RESTORE_OBJECTS=$(subst .cc,.o,$(THIN_RESTORE_SOURCE))
@@ -219,6 +222,10 @@ thin_debug: $(THIN_DEBUG_OBJECTS) thin-provisioning/thin_debug.o
 	@echo "    [LD]  $@"
 	$(V) $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $+ $(LIBS) $(LIBEXPAT)
 
+thin_show_blocks: $(THIN_SHOW_BLOCKS_OBJECTS) thin-provisioning/thin_show_blocks.o
+	@echo "    [LD]  $@"
+	$(V) $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $+ $(LIBS) $(LIBEXPAT)
+
 thin_repair: $(THIN_REPAIR_OBJECTS) thin-provisioning/thin_repair.o
 	@echo "    [LD]  $@"
 	$(V) $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $+ $(LIBS) $(LIBEXPAT)

persistent-data/space-maps/disk.cc

@@ -35,8 +35,6 @@ using namespace sm_disk_detail;
 //----------------------------------------------------------------
 
 namespace {
-	uint64_t const BITMAP_CSUM_XOR = 240779;
-
 	struct bitmap_block_validator : public block_manager<>::validator {
 		virtual void check(buffer<> const &b, block_address location) const {
 			bitmap_header const *data = reinterpret_cast<bitmap_header const *>(&b);
@@ -61,8 +59,6 @@ namespace {
 
 	//--------------------------------
 
-	uint64_t const INDEX_CSUM_XOR = 160478;
-
 	// FIXME: factor out the common code in these validators
 	struct index_block_validator : public block_manager<>::validator {
 		virtual void check(buffer<> const &b, block_address location) const {

persistent-data/space-maps/disk_structures.h

@@ -110,6 +110,9 @@ namespace persistent_data {
 			le32 not_used;
 			le64 blocknr;
 		} __attribute__ ((packed));
+
+		uint64_t const BITMAP_CSUM_XOR = 240779;
+		uint64_t const INDEX_CSUM_XOR = 160478;
 	}
 }
 

thin-provisioning/thin_show_blocks.cc

@@ -0,0 +1,139 @@
+#include <iostream>
+#include <getopt.h>
+#include <libgen.h>
+#include <stdlib.h>
+#include <stdexcept>
+
+#include "persistent-data/checksum.h"
+#include "persistent-data/data-structures/btree.h"
+#include "persistent-data/file_utils.h"
+#include "persistent-data/space-maps/disk_structures.h"
+#include "thin-provisioning/metadata.h"
+#include "thin-provisioning/superblock.h"
+#include "version.h"
+
+using namespace persistent_data;
+using namespace std;
+using namespace sm_disk_detail;
+using namespace thin_provisioning;
+
+//----------------------------------------------------------------
+
+namespace {
+	bool is_superblock(block_manager<>::read_ref &rr) {
+		using namespace superblock_detail;
+
+		superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&rr.data());
+		if (to_cpu<uint64_t>(sbd->magic_) == SUPERBLOCK_MAGIC) {
+			superblock sb;
+			superblock_traits::unpack(*sbd, sb);
+			cout << "metadata nr blocks: " << sb.metadata_nr_blocks_ << endl;
+
+			return true;
+		}
+
+		return false;
+	}
+
+	bool is_bitmap_block(block_manager<>::read_ref &rr) {
+		bitmap_header const *data = reinterpret_cast<bitmap_header const *>(&rr.data());
+		crc32c sum(BITMAP_CSUM_XOR);
+		sum.append(&data->not_used, MD_BLOCK_SIZE - sizeof(uint32_t));
+		return sum.get_sum() == to_cpu<uint32_t>(data->csum);
+	}
+
+	bool is_index_block(block_manager<>::read_ref &rr) {
+		metadata_index const *mi = reinterpret_cast<metadata_index const *>(&rr.data());
+		crc32c sum(INDEX_CSUM_XOR);
+		sum.append(&mi->padding_, MD_BLOCK_SIZE - sizeof(uint32_t));
+		return sum.get_sum() == to_cpu<uint32_t>(mi->csum_);
+	}
+
+	bool is_btree_node(block_manager<>::read_ref &rr) {
+		using namespace btree_detail;
+
+		disk_node const *data = reinterpret_cast<disk_node const *>(&rr.data());
+		node_header const *n = &data->header;
+		crc32c sum(BTREE_CSUM_XOR);
+		sum.append(&n->flags, MD_BLOCK_SIZE - sizeof(uint32_t));
+		return sum.get_sum() == to_cpu<uint32_t>(n->csum);
+	}
+
+	void show_blocks(string const &dev) {
+		block_manager<>::ptr bm = open_bm(dev, block_io<>::READ_ONLY);
+
+		metadata md(bm, metadata::OPEN);
+		cout << "Metadata space map: nr_blocks = " << md.metadata_sm_->get_nr_blocks()
+		     << ", nr_free_blocks = " << md.metadata_sm_->get_nr_free()
+		     << endl;
+		cout << "Data space map: nr_blocks = " << md.data_sm_->get_nr_blocks()
+		     << ", nr_free_blocks = " << md.data_sm_->get_nr_free()
+		     << endl;
+
+		block_address nr_blocks = bm->get_nr_blocks();
+		for (block_address b = 0; b < nr_blocks; b++) {
+			block_manager<>::read_ref rr = bm->read_lock(b);
+
+			if (is_superblock(rr))
+				cout << b << ": superblock" << endl;
+
+			else if (is_bitmap_block(rr))
+				cout << b << ": bitmap block" << endl;
+
+			else if (is_btree_node(rr))
+				cout << b << ": btree_node" << endl;
+
+			else
+				cout << b << ": unknown" << endl;
+		}
+	}
+
+	void usage(ostream &out, string const &progname) {
+		out << "Usage: " << progname << " {device|file}" << endl
+		    << "Options:" << endl
+		    << "  {-h|--help}" << endl
+		    << "  {-V|--version}" << endl;
+	}
+}
+
+//----------------------------------------------------------------
+
+int main(int argc, char **argv)
+{
+	int c;
+	const char shortopts[] = "hV";
+	const struct option longopts[] = {
+		{ "help", no_argument, NULL, 'h'},
+		{ "version", no_argument, NULL, 'V'},
+		{ NULL, no_argument, NULL, 0 }
+	};
+
+	while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
+		switch(c) {
+		case 'h':
+			usage(cout, basename(argv[0]));
+			return 0;
+
+		case 'V':
+			cerr << THIN_PROVISIONING_TOOLS_VERSION << endl;
+			return 0;
+		}
+	}
+
+	if (argc == optind) {
+		usage(cerr, basename(argv[0]));
+		exit(1);
+	}
+
+	try {
+		show_blocks(argv[optind]);
+
+	} catch (std::exception const &e) {
+		cerr << e.what() << endl;
+		return 1;
+	}
+
+	return 0;
+}
+
+//----------------------------------------------------------------