80 lines
2.0 KiB
C++
80 lines
2.0 KiB
C++
#include "persistent-data/math_utils.h"
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#include "persistent-data/file_utils.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 base;
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using namespace bcache;
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using namespace persistent_data;
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//----------------------------------------------------------------
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block_address
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persistent_data::get_nr_blocks(string const &path, block_address block_size)
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{
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using namespace persistent_data;
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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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ostringstream out;
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out << "Couldn't stat dev path '" << path << "'";
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throw runtime_error(out.str());
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}
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if (S_ISREG(info.st_mode) && info.st_size)
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nr_blocks = div_down<block_address>(info.st_size, 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, block_size);
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} else
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// FIXME: needs a better message
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throw runtime_error("bad path");
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return nr_blocks;
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}
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block_address
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persistent_data::get_nr_metadata_blocks(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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void
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persistent_data::check_file_exists(string const &file) {
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struct stat info;
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int r = ::stat(file.c_str(), &info);
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if (r)
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throw runtime_error("Couldn't stat file");
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if (!S_ISREG(info.st_mode))
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throw runtime_error("Not a regular file");
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}
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//----------------------------------------------------------------
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