69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
#include "base/math_utils.h"
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#include "persistent-data/file_utils.h"
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#include "persistent-data/space-maps/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 <fcntl.h>
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#include <string.h>
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#include <sstream>
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#include <unistd.h>
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using namespace base;
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using namespace bcache;
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using namespace persistent_data;
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using namespace std;
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//----------------------------------------------------------------
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bool
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persistent_data::check_for_xml(block_manager::ptr bm) {
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block_manager::read_ref b = bm->read_lock(0);
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const char *data = reinterpret_cast<const char *>(b.data());
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return (!strncmp(data, "<superblock", 11) || !strncmp(data, "<?xml", 5)
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|| !strncmp(data, "<!DOCTYPE", 9));
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}
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persistent_data::block_address
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persistent_data::get_nr_blocks(std::string const &path, sector_t block_size)
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{
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return div_down<block_address>(file_utils::get_file_length(path),
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block_size);
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}
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block_address
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persistent_data::get_nr_metadata_blocks(std::string const &path)
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{
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return get_nr_blocks(path, MD_BLOCK_SIZE);
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}
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persistent_data::block_manager::ptr
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persistent_data::open_bm(std::string const &dev_path, block_manager::mode m, bool excl)
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{
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block_address nr_blocks = get_nr_metadata_blocks(dev_path);
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return block_manager::ptr(new block_manager(dev_path, nr_blocks, 1, m, excl));
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}
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block_manager::ptr
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persistent_data::open_bm(std::string const &path) {
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block_address nr_blocks = get_nr_metadata_blocks(path);
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block_manager::mode m = block_manager::READ_ONLY;
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return block_manager::ptr(new block_manager(path, nr_blocks, 1, m));
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}
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transaction_manager::ptr
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persistent_data::open_tm(block_manager::ptr bm, block_address superblock_location) {
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auto nr_blocks = bm->get_nr_blocks();
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if (!nr_blocks)
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throw runtime_error("Metadata is not large enough for superblock.");
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space_map::ptr sm{create_core_map(nr_blocks)};
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sm->inc(superblock_location);
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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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//----------------------------------------------------------------
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