thin-provisioning-tools/caching/superblock.h

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2013-08-16 18:09:12 +05:30
#ifndef CACHE_SUPERBLOCK_H
#define CACHE_SUPERBLOCK_H
#include "persistent-data/endian_utils.h"
#include "persistent-data/data-structures/btree.h"
//----------------------------------------------------------------
namespace caching {
namespace superblock_detail {
using namespace base;
unsigned const SPACE_MAP_ROOT_SIZE = 128;
unsigned const CACHE_POLICY_NAME_SIZE = 16;
unsigned const CACHE_POLICY_VERSION_SIZE = 3;
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);
};
block_address const SUPERBLOCK_LOCATION = 0;
uint32_t const SUPERBLOCK_MAGIC = 06142003;
//--------------------------------
class damage_visitor;
struct damage {
virtual ~damage() {}
virtual void visit(damage_visitor &v) const = 0;
};
struct superblock_corruption : public damage {
superblock_corruption(std::string const &desc);
void visit(damage_visitor &v) const;
std::string desc_;
};
class damage_visitor {
public:
virtual ~damage_visitor() {}
void visit(damage const &d);
virtual void visit(superblock_corruption const &d) = 0;
};
}
persistent_data::block_manager<>::validator::ptr superblock_validator();
superblock_detail::superblock read_superblock(persistent_data::block_manager<>::ptr bm);
superblock_detail::superblock read_superblock(persistent_data::block_manager<>::ptr bm,
persistent_data::block_address location);
void write_superblock(persistent_data::block_manager<>::ptr bm,
superblock_detail::superblock const &sb);
void write_superblock(persistent_data::block_manager<>::ptr bm,
persistent_data::block_address location,
superblock_detail::superblock const &sb);
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void check_superblock(persistent_data::block_manager<>::ptr bm,
superblock_detail::damage_visitor &visitor);
}
//----------------------------------------------------------------
#endif