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  • Correction: it actually gets you the size in SECTORS. Edit it and I'll upvote. Commented Jun 22, 2012 at 1:14
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    @JCCyC: BLKGETSIZE64 returns the size in bytes. See linux/fs.h, which notes "return device size in bytes". Note that BLKGETSIZE (no "64") returns it "/512". Commented Mar 3, 2013 at 23:26
  • I worked out a fuller sample partly based on this at stackoverflow.com/a/48490543/446106. To use the above snippet here, file needs to be a file descriptor (e.g. from open()), and file_size_in_bytes should be a size_t. Commented Jan 28, 2018 at 19:54
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    (Actually, file_size_in_bytes should be a 64-bit type, so it should be unsigned long long.) Commented Jan 28, 2018 at 20:17