49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
#include "persistent-data/math_utils.h"
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#include "thin-provisioning/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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//----------------------------------------------------------------
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block_address
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thin_provisioning::get_nr_blocks(string const &path)
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{
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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) && info.st_size)
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nr_blocks = div_up<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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// 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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//----------------------------------------------------------------
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