space map disk

2011-07-22 16:09:56 +01:00
parent 186753d443
commit a683979585
25 changed files with 1389 additions and 221 deletions
--- a/metadata_disk_structures.h
+++ b/metadata_disk_structures.h
@@ -0,0 +1,117 @@
+#ifndef METADATA_DISK_STRUCTURES_H
+#define METADATA_DISK_STRUCTURES_H
+
+#include "endian.h"
+#include "btree.h"
+
+//----------------------------------------------------------------
+
+namespace thin_provisioning {
+	using namespace base;	// FIXME: don't use namespaces in headers.
+
+	struct device_details_disk {
+		__le64 dev_size_;
+		__le64 mapped_blocks_;
+		__le64 transaction_id_;  /* when created */
+		__le32 creation_time_;
+		__le32 snapshotted_time_;
+	} __attribute__ ((packed));
+
+	struct device_details {
+		uint64_t dev_size_;
+		uint64_t mapped_blocks_;
+		uint64_t transaction_id_;  /* when created */
+		uint32_t creation_time_;
+		uint32_t snapshotted_time_;
+	};
+
+	struct device_details_traits {
+		typedef device_details_disk disk_type;
+		typedef device_details value_type;
+		typedef persistent_data::NoOpRefCounter<device_details> ref_counter;
+
+		static void unpack(device_details_disk const &disk, device_details &value);
+		static void pack(device_details const &value, device_details_disk &disk);
+	};
+
+	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_;
+		__le32 time_;
+
+		__le64 trans_id_;
+		/* root for userspace's transaction (for migration and friends) */
+		__le64 held_root_;
+
+		__u8 data_space_map_root_[SPACE_MAP_ROOT_SIZE];
+		__u8 metadata_space_map_root_[SPACE_MAP_ROOT_SIZE];
+
+		/* 2 level btree mapping (dev_id, (dev block, time)) -> data block */
+		__le64 data_mapping_root_;
+
+		/* device detail root mapping dev_id -> device_details */
+		__le64 device_details_root_;
+
+		__le32 data_block_size_; /* in 512-byte sectors */
+
+		__le32 metadata_block_size_; /* in 512-byte sectors */
+		__le64 metadata_nr_blocks_;
+
+		__le32 compat_flags_;
+		__le32 incompat_flags_;
+	} __attribute__ ((packed));
+
+	struct superblock {
+		uint32_t csum_;
+		uint32_t flags_;
+		uint64_t blocknr_;
+
+		unsigned char uuid_[16];
+		uint64_t magic_;
+		uint32_t version_;
+		uint32_t time_;
+
+		uint64_t trans_id_;
+		/* root for userspace's transaction (for migration and friends) */
+		uint64_t held_root_;
+
+		unsigned char data_space_map_root_[SPACE_MAP_ROOT_SIZE];
+		unsigned char metadata_space_map_root_[SPACE_MAP_ROOT_SIZE];
+
+		/* 2 level btree mapping (dev_id, (dev block, time)) -> data block */
+		uint64_t data_mapping_root_;
+
+		/* device detail root mapping dev_id -> device_details */
+		uint64_t device_details_root_;
+
+		uint32_t data_block_size_; /* in 512-byte sectors */
+
+		uint32_t metadata_block_size_; /* in 512-byte sectors */
+		uint64_t metadata_nr_blocks_;
+
+		uint32_t compat_flags_;
+		uint32_t incompat_flags_;
+	};
+
+	struct superblock_traits {
+		typedef superblock_disk disk_type;
+		typedef superblock value_type;
+		typedef NoOpRefCounter<superblock> ref_counter;
+
+		static void unpack(superblock_disk const &disk, superblock &value);
+		static void pack(superblock const &value, superblock_disk &disk);
+	};
+}
+
+//----------------------------------------------------------------
+
+#endif