cache tools wip

2013-03-15 14:59:21 +00:00
parent 12dff31358
commit 2ed1648896
5 changed files with 593 additions and 0 deletions
--- a/cache/cache_metadata_disk_structures.h
+++ b/cache/cache_metadata_disk_structures.h
@@ -0,0 +1,118 @@
+// Copyright (C) 2012 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 CACHE_METADATA_DISK_STRUCTURES_H
+#define CACHE_METADATA_DISK_STRUCTURES_H
+
+#include "endian_utils.h"
+#include "btree.h"
+
+//----------------------------------------------------------------
+
+// FIXME: rename to just METADATA_DISK_STRUCTURES
+namespace cache_tools {
+	using namespace base;	// FIXME: don't use namespaces in headers.
+
+	unsigned const SPACE_MAP_ROOT_SIZE = 128;
+
+	typedef unsigned char __u8;
+
+	struct superblock_disk {
+		__le32 csum;
+		__le32 flags;
+		__le64 blocknr;
+
+		__u8 uuid[16];
+		__le64 magic;
+		__le32 version;
+
+		__u8 policy_name[CACHE_POLICY_NAME_SIZE];
+		__le32 policy_version[CACHE_POLICY_VERSION_SIZE];
+		__le32 policy_hint_size;
+
+		__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
+
+		__le64 mapping_root;
+		__le64 hint_root;
+
+		__le64 discard_root;
+		__le64 discard_block_size;
+		__le64 discard_nr_blocks;
+
+		__le32 data_block_size; /* in 512-byte sectors */
+		__le32 metadata_block_size; /* in 512-byte sectors */
+		__le32 cache_blocks;
+
+		__le32 compat_flags_;
+		__le32 compat_ro_flags_;
+		__le32 incompat_flags_;
+
+		__le32 read_hits;
+		__le32 read_misses;
+		__le32 write_hits;
+		__le32 write_misses;
+	} __attribute__ ((packed));
+
+	struct superblock {
+		uint32_t csum;
+		uint32_t flags;
+		uint64_t blocknr;
+
+		__u8 uuid[16];
+		uint64_t magic;
+		uint32_t version;
+
+		__u8 policy_name[CACHE_POLICY_NAME_SIZE];
+		uint32_t policy_version[CACHE_POLICY_VERSION_SIZE];
+		uint32_t policy_hint_size;
+
+		__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
+
+		uint64_t mapping_root;
+		uint64_t hint_root;
+
+		uint64_t discard_root;
+		uint64_t discard_block_size;
+		uint64_t discard_nr_blocks;
+
+		uint32_t data_block_size; /* in 512-byte sectors */
+		uint32_t metadata_block_size; /* in 512-byte sectors */
+		uint32_t cache_blocks;
+
+		uint32_t compat_flags_;
+		uint32_t compat_ro_flags_;
+		uint32_t incompat_flags_;
+
+		uint32_t read_hits;
+		uint32_t read_misses;
+		uint32_t write_hits;
+		uint32_t write_misses;
+	};
+
+	struct superblock_traits {
+		typedef superblock_disk disk_type;
+		typedef superblock value_type;
+
+		static void unpack(superblock_disk const &disk, superblock &value);
+		static void pack(superblock const &value, superblock_disk &disk);
+	};
+}
+
+//----------------------------------------------------------------
+
+#endif