On 5/30/13 6:49 AM, Robert Haas wrote:
On Wed, May 29, 2013 at 10:42 AM, Andres Freund <and...@2ndquadrant.com> wrote:
So we don't even know whether we can read. I think that means we need to
zero the file anyway...

Surely this is undue pessimism.

There have been many occasions where I've found the Linux kernel defining support for POSIX behavior with a NOP stub that basically says "we should make this work one day". I don't know whether the fallocate code is one of those or a fully implemented call. Based on that history, until I see a reader that validates the resulting files are good I have to assume they're not.

Greg Smith   2ndQuadrant US    g...@2ndquadrant.com   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.com

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