149 lines
4.0 KiB
C++
149 lines
4.0 KiB
C++
#ifndef THIN_SUPERBLOCK_H
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#define THIN_SUPERBLOCK_H
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#include "base/endian_utils.h"
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#include "persistent-data/block.h"
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#include "persistent-data/data-structures/ref_counter.h"
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//----------------------------------------------------------------
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namespace thin_provisioning {
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namespace superblock_detail {
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using namespace base;
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using namespace persistent_data;
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unsigned const SPACE_MAP_ROOT_SIZE = 128;
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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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le32 time_;
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le64 trans_id_;
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/* root for userspace's transaction (for migration and friends) */
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le64 metadata_snap_;
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__u8 data_space_map_root_[SPACE_MAP_ROOT_SIZE];
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__u8 metadata_space_map_root_[SPACE_MAP_ROOT_SIZE];
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/* 2 level btree mapping (dev_id, (dev block, time)) -> data block */
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le64 data_mapping_root_;
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/* device detail root mapping dev_id -> device_details */
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le64 device_details_root_;
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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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le64 metadata_nr_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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} __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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unsigned char uuid_[16];
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uint64_t magic_;
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uint32_t version_;
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uint32_t time_;
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uint64_t trans_id_;
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/* root for userspace's transaction (for migration and friends) */
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uint64_t metadata_snap_;
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unsigned char data_space_map_root_[SPACE_MAP_ROOT_SIZE];
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unsigned char metadata_space_map_root_[SPACE_MAP_ROOT_SIZE];
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/* 2 level btree mapping (dev_id, (dev block, time)) -> data block */
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uint64_t data_mapping_root_;
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/* device detail root mapping dev_id -> device_details */
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uint64_t device_details_root_;
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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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uint64_t metadata_nr_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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bool get_needs_check_flag() const;
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void set_needs_check_flag(bool val = true);
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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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typedef no_op_ref_counter<superblock> ref_counter;
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static void unpack(superblock_disk const &disk, superblock &core);
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static void pack(superblock const &core, 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 = 27022010;
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uint32_t const METADATA_VERSION = 2;
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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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bcache::validator::ptr superblock_validator();
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// FIXME: should we put init_superblock in here too?
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// FIXME: make the bm const, and pass by reference rather than ptr
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superblock_detail::superblock read_superblock(persistent_data::block_manager const &bm);
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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 write_superblock(persistent_data::block_manager::ptr bm,
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superblock_detail::superblock const &sb);
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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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persistent_data::block_address sb_location = superblock_detail::SUPERBLOCK_LOCATION);
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}
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//----------------------------------------------------------------
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#endif
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