caching/superblock.{h,cc}
This commit is contained in:
Joe Thornber
parent
500e508c6d
commit
1e925d4cf1
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@ -48,7 +48,7 @@ PDATA_SOURCE=\
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SOURCE=\
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$(PDATA_SOURCE) \
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\
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cache/metadata_disk_structures.cc \
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caching/superblock.cc \
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\
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thin-provisioning/device_tree.cc \
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thin-provisioning/file_utils.cc \
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@ -66,7 +66,7 @@ SOURCE=\
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PDATA_OBJECTS=$(subst .cc,.o,$(SOURCE))
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CXX_PROGRAM_SOURCE=\
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cache/check.cc \
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caching/check.cc \
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\
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thin-provisioning/thin_check.cc \
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thin-provisioning/thin_dump.cc \
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@ -228,11 +228,11 @@ CACHE_CHECK_SOURCE=\
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persistent-data/space-maps/recursive.cc \
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persistent-data/space-maps/careful_alloc.cc \
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persistent-data/transaction_manager.cc \
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cache/metadata_disk_structures.cc
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caching/superblock.cc
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CACHE_CHECK_OBJECTS=$(subst .cc,.o,$(CACHE_CHECK_SOURCE))
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cache_check: $(CACHE_CHECK_OBJECTS) cache/check.o
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cache_check: $(CACHE_CHECK_OBJECTS) caching/check.o
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@echo " [LD] $@"
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$(V) $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $+ $(LIBS)
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@ -1,120 +0,0 @@
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// Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#ifndef CACHE_METADATA_DISK_STRUCTURES_H
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#define CACHE_METADATA_DISK_STRUCTURES_H
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#include "persistent-data/endian_utils.h"
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#include "persistent-data/data-structures/btree.h"
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//----------------------------------------------------------------
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// FIXME: rename to just METADATA_DISK_STRUCTURES
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namespace cache_tools {
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using namespace base; // FIXME: don't use namespaces in headers.
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unsigned const SPACE_MAP_ROOT_SIZE = 128;
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unsigned const CACHE_POLICY_NAME_SIZE = 16;
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unsigned const CACHE_POLICY_VERSION_SIZE = 3;
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typedef unsigned char __u8;
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struct superblock_disk {
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le32 csum;
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le32 flags;
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le64 blocknr;
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__u8 uuid[16];
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le64 magic;
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le32 version;
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__u8 policy_name[CACHE_POLICY_NAME_SIZE];
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le32 policy_version[CACHE_POLICY_VERSION_SIZE];
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le32 policy_hint_size;
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__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
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le64 mapping_root;
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le64 hint_root;
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le64 discard_root;
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le64 discard_block_size;
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le64 discard_nr_blocks;
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le32 data_block_size; /* in 512-byte sectors */
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le32 metadata_block_size; /* in 512-byte sectors */
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le32 cache_blocks;
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le32 compat_flags;
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le32 compat_ro_flags;
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le32 incompat_flags;
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le32 read_hits;
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le32 read_misses;
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le32 write_hits;
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le32 write_misses;
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} __attribute__ ((packed));
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struct superblock {
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uint32_t csum;
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uint32_t flags;
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uint64_t blocknr;
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__u8 uuid[16];
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uint64_t magic;
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uint32_t version;
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__u8 policy_name[CACHE_POLICY_NAME_SIZE];
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uint32_t policy_version[CACHE_POLICY_VERSION_SIZE];
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uint32_t policy_hint_size;
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__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
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uint64_t mapping_root;
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uint64_t hint_root;
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uint64_t discard_root;
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uint64_t discard_block_size;
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uint64_t discard_nr_blocks;
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uint32_t data_block_size; /* in 512-byte sectors */
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uint32_t metadata_block_size; /* in 512-byte sectors */
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uint32_t cache_blocks;
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uint32_t compat_flags;
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uint32_t compat_ro_flags;
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uint32_t incompat_flags;
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uint32_t read_hits;
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uint32_t read_misses;
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uint32_t write_hits;
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uint32_t write_misses;
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};
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struct superblock_traits {
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typedef superblock_disk disk_type;
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typedef superblock value_type;
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static void unpack(superblock_disk const &disk, superblock &value);
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static void pack(superblock const &value, superblock_disk &disk);
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};
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}
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//----------------------------------------------------------------
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#endif
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@ -0,0 +1,28 @@
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// Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#include "metadata_disk_structures.h"
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#include <string.h>
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using namespace cache_tools;
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//----------------------------------------------------------------
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//----------------------------------------------------------------
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@ -0,0 +1,35 @@
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// Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#ifndef CACHE_METADATA_DISK_STRUCTURES_H
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#define CACHE_METADATA_DISK_STRUCTURES_H
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#include "persistent-data/endian_utils.h"
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#include "persistent-data/data-structures/btree.h"
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//----------------------------------------------------------------
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// FIXME: rename to just METADATA_DISK_STRUCTURES
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namespace cache_tools {
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using namespace base; // FIXME: don't use namespaces in headers.
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}
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//----------------------------------------------------------------
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#endif
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@ -1,26 +1,7 @@
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// Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#include "caching/superblock.h"
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#include "metadata_disk_structures.h"
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#include <string.h>
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using namespace cache_tools;
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using namespace caching;
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using namespace superblock_detail;
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//----------------------------------------------------------------
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@ -110,4 +91,87 @@ superblock_traits::pack(superblock const &core, superblock_disk &disk)
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disk.write_misses = to_disk<le32>(core.write_misses);
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}
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//--------------------------------
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superblock_corruption::superblock_corruption(std::string const &desc)
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: desc_(desc)
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{
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}
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void
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superblock_corruption::visit(damage_visitor &v) const
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{
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v.visit(*this);
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}
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//--------------------------------
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namespace {
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using namespace persistent_data;
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using namespace superblock_detail;
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uint32_t const VERSION = 1;
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unsigned const SECTOR_TO_BLOCK_SHIFT = 3;
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uint32_t const SUPERBLOCK_CSUM_SEED = 9031977;
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struct sb_validator : public block_manager<>::validator {
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virtual void check(buffer<> const &b, block_address location) const {
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superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&b);
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crc32c sum(SUPERBLOCK_CSUM_SEED);
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sum.append(&sbd->flags, MD_BLOCK_SIZE - sizeof(uint32_t));
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if (sum.get_sum() != to_cpu<uint32_t>(sbd->csum))
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throw checksum_error("bad checksum in superblock");
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}
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virtual void prepare(buffer<> &b, block_address location) const {
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superblock_disk *sbd = reinterpret_cast<superblock_disk *>(&b);
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crc32c sum(SUPERBLOCK_CSUM_SEED);
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sum.append(&sbd->flags, MD_BLOCK_SIZE - sizeof(uint32_t));
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sbd->csum = to_disk<base::le32>(sum.get_sum());
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}
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};
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}
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persistent_data::block_manager<>::validator::ptr
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caching::superblock_validator()
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{
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return block_manager<>::validator::ptr(new sb_validator);
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}
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//--------------------------------
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superblock_detail::superblock
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caching::read_superblock(persistent_data::block_manager<>::ptr bm,
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persistent_data::block_address location)
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{
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using namespace superblock_detail;
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superblock sb;
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block_manager<>::read_ref r = bm->read_lock(location, superblock_validator());
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superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&r.data());
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superblock_traits::unpack(*sbd, sb);
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return sb;
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}
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superblock_detail::superblock
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caching::read_superblock(persistent_data::block_manager<>::ptr bm)
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{
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return read_superblock(bm, SUPERBLOCK_LOCATION);
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}
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void
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caching::check_superblock(persistent_data::block_manager<>::ptr bm,
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superblock_detail::damage_visitor &visitor)
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{
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using namespace superblock_detail;
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try {
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bm->read_lock(SUPERBLOCK_LOCATION, superblock_validator());
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} catch (std::exception const &e) {
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visitor.visit(superblock_corruption(e.what()));
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}
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}
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//----------------------------------------------------------------
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@ -0,0 +1,139 @@
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#ifndef CACHE_SUPERBLOCK_H
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#define CACHE_SUPERBLOCK_H
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#include "persistent-data/endian_utils.h"
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#include "persistent-data/data-structures/btree.h"
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//----------------------------------------------------------------
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namespace caching {
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namespace superblock_detail {
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using namespace base;
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unsigned const SPACE_MAP_ROOT_SIZE = 128;
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unsigned const CACHE_POLICY_NAME_SIZE = 16;
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unsigned const CACHE_POLICY_VERSION_SIZE = 3;
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typedef unsigned char __u8;
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struct superblock_disk {
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le32 csum;
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le32 flags;
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le64 blocknr;
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__u8 uuid[16];
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le64 magic;
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le32 version;
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__u8 policy_name[CACHE_POLICY_NAME_SIZE];
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le32 policy_version[CACHE_POLICY_VERSION_SIZE];
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le32 policy_hint_size;
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__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
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le64 mapping_root;
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le64 hint_root;
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le64 discard_root;
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le64 discard_block_size;
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le64 discard_nr_blocks;
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le32 data_block_size; /* in 512-byte sectors */
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le32 metadata_block_size; /* in 512-byte sectors */
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le32 cache_blocks;
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le32 compat_flags;
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le32 compat_ro_flags;
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le32 incompat_flags;
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le32 read_hits;
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le32 read_misses;
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le32 write_hits;
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le32 write_misses;
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} __attribute__ ((packed));
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struct superblock {
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uint32_t csum;
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uint32_t flags;
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uint64_t blocknr;
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__u8 uuid[16];
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uint64_t magic;
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uint32_t version;
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__u8 policy_name[CACHE_POLICY_NAME_SIZE];
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uint32_t policy_version[CACHE_POLICY_VERSION_SIZE];
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uint32_t policy_hint_size;
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__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
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uint64_t mapping_root;
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uint64_t hint_root;
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uint64_t discard_root;
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uint64_t discard_block_size;
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uint64_t discard_nr_blocks;
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uint32_t data_block_size; /* in 512-byte sectors */
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uint32_t metadata_block_size; /* in 512-byte sectors */
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uint32_t cache_blocks;
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uint32_t compat_flags;
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uint32_t compat_ro_flags;
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uint32_t incompat_flags;
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uint32_t read_hits;
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uint32_t read_misses;
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uint32_t write_hits;
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uint32_t write_misses;
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};
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struct superblock_traits {
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typedef superblock_disk disk_type;
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typedef superblock value_type;
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static void unpack(superblock_disk const &disk, superblock &value);
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static void pack(superblock const &value, superblock_disk &disk);
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};
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block_address const SUPERBLOCK_LOCATION = 0;
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uint32_t const SUPERBLOCK_MAGIC = 06142003;
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//--------------------------------
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class damage_visitor;
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struct damage {
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virtual ~damage() {}
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virtual void visit(damage_visitor &v) const = 0;
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};
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struct superblock_corruption : public damage {
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superblock_corruption(std::string const &desc);
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void visit(damage_visitor &v) const;
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std::string desc_;
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};
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class damage_visitor {
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public:
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virtual ~damage_visitor() {}
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void visit(damage const &d);
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virtual void visit(superblock_corruption const &d) = 0;
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};
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}
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persistent_data::block_manager<>::validator::ptr superblock_validator();
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superblock_detail::superblock read_superblock(persistent_data::block_manager<>::ptr bm);
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superblock_detail::superblock read_superblock(persistent_data::block_manager<>::ptr bm,
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persistent_data::block_address location);
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void check_superblock(persistent_data::block_manager<>::ptr bm,
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superblock_detail::damage_visitor &visitor);
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}
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//----------------------------------------------------------------
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#endif
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