119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
#include "metadata.h"
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#include "math_utils.h"
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#include "space_map_disk.h"
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#include "space_map_core.h"
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#include <linux/fs.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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using namespace thin_provisioning;
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//----------------------------------------------------------------
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namespace {
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uint32_t const SUPERBLOCK_MAGIC = 27022010;
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uint32_t const VERSION = 1;
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unsigned const METADATA_CACHE_SIZE = 1024;
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unsigned const SECTOR_TO_BLOCK_SHIFT = 3;
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block_address get_nr_blocks(string const &path) {
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struct stat info;
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block_address nr_blocks;
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int r = ::stat(path.c_str(), &info);
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if (r)
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throw runtime_error("Couldn't stat dev path");
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if (S_ISREG(info.st_mode))
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nr_blocks = div_down<block_address>(info.st_size, MD_BLOCK_SIZE);
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else if (S_ISBLK(info.st_mode)) {
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// To get the size of a block device we need to
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// open it, and then make an ioctl call.
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int fd = ::open(path.c_str(), O_RDONLY);
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if (fd < 0)
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throw runtime_error("couldn't open block device to ascertain size");
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r = ::ioctl(fd, BLKGETSIZE64, &nr_blocks);
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if (r) {
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::close(fd);
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throw runtime_error("ioctl BLKGETSIZE64 failed");
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}
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::close(fd);
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nr_blocks = div_down<block_address>(nr_blocks, MD_BLOCK_SIZE);
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} else
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throw runtime_error("bad path");
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return nr_blocks;
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}
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transaction_manager::ptr
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open_tm(string const &dev_path) {
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block_address nr_blocks = get_nr_blocks(dev_path);
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block_manager<>::ptr bm(new block_manager<>(dev_path, nr_blocks, 8));
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space_map::ptr sm(new core_map(nr_blocks));
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transaction_manager::ptr tm(new transaction_manager(bm, sm));
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return tm;
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}
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superblock read_superblock(block_manager<>::ptr bm) {
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superblock sb;
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block_manager<>::read_ref r = bm->read_lock(SUPERBLOCK_LOCATION);
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superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&r.data());
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crc32c sum(160774); // FIXME: magic number
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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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ostringstream out;
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out << "bad checksum in superblock, calculated "
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<< sum.get_sum()
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<< ", superblock contains " << to_cpu<uint32_t>(sbd->csum_);
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throw runtime_error(out.str());
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}
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superblock_traits::unpack(*sbd, sb);
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return sb;
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}
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}
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//----------------------------------------------------------------
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metadata::metadata(std::string const &dev_path, open_type ot)
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: tm_(open_tm(dev_path)),
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sb_(read_superblock(tm_->get_bm())),
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metadata_sm_(open_metadata_sm(tm_, static_cast<void *>(&sb_.metadata_space_map_root_))),
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data_sm_(open_disk_sm(tm_, static_cast<void *>(&sb_.data_space_map_root_))),
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details_(new detail_tree(tm_, sb_.device_details_root_, device_details_traits::ref_counter())),
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mappings_top_level_(new dev_tree(tm_, sb_.data_mapping_root_, mtree_ref_counter(tm_))),
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mappings_(new mapping_tree(tm_, sb_.data_mapping_root_, block_time_ref_counter(data_sm_)))
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{
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tm_->set_sm(open_metadata_sm(tm_, sb_.metadata_space_map_root_));
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}
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#if 0
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::memset(&sb_, 0, sizeof(sb_));
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sb_.data_mapping_root_ = mappings_.get_root();
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sb_.device_details_root_ = details_.get_root();
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sb_.metadata_block_size_ = MD_BLOCK_SIZE;
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sb_.metadata_nr_blocks_ = tm_->get_bm()->get_nr_blocks();
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#endif
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void
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metadata::commit()
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{
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sb_.data_mapping_root_ = mappings_->get_root();
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sb_.device_details_root_ = details_->get_root();
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// FIXME: commit and copy the space map roots
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write_ref superblock = tm_->get_bm()->superblock(SUPERBLOCK_LOCATION);
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superblock_disk *disk = reinterpret_cast<superblock_disk *>(superblock.data());
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superblock_traits::pack(sb_, *disk);
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}
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//----------------------------------------------------------------
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