How to know the file size limit, and know if O_DIRECT is supported

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Hi all,
2 questions. Please help me.

How do I know the file size limit on a unknown filesystem?
Our application can use CIFS and record data to the remote site.
We would like to know the file size limit before we start to record, but the
"fstat" doesn't tell us about this.

And another question is how do I know if Direct I/O is usable on some
filesystem and storage?

Regards,
Colin



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