Writing with directio to a LTFS DM managed file system fails.
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martin-petermann commented
When writing with O_DIRECT to a LTFS DM managed file system fails the write call fails with
EINVAL fd is attached to an object which is unsuitable for writing; or the file was opened with the O_DIRECT flag, and either the address specified in buf, the value specified in count, or the current file offset is not suitably aligned.
Probably an issue with memory alignment.