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improve error message when failing to stat block device

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This commit is contained in:
Thanos Makatos 2016-03-31 14:20:12 +03:00
parent 022b70f861
commit ab958ee752
1 changed files with 2 additions and 1 deletions
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3
persistent-data/file_utils.cc
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@ -21,7 +21,8 @@ persistent_data::get_nr_blocks(string const &path, sector_t block_size)
int r = ::stat(path.c_str(), &info);
if (r)
throw runtime_error("Couldn't stat dev path");
throw runtime_error("Couldn't stat dev path " + path + ": " +
strerror(errno));
if (S_ISREG(info.st_mode) && info.st_size)
nr_blocks = div_up<block_address>(info.st_size, block_size);