[Bugs] [Bug 1389532] New: [RFE] Add a feature to fallocate after ftruncate

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1389532

            Bug ID: 1389532
           Summary: [RFE] Add a feature to fallocate after ftruncate
           Product: GlusterFS
           Version: mainline
         Component: posix
          Assignee: bugs at gluster.org
          Reporter: joe at julianfamily.org
                CC: bugs at gluster.org



Oversubscription of storage may not be desirable. Having users create 6 20TB
images on a 60TB brick is a disaster waiting to happen. Yes, sharding may help
mitigate that, but it would be nice to have allocation guarantees.

It seems to me that if you added an option to the posix translator where any
ftruncate would immediately be followed with an fallocate for that same size,
that guarantee could be met.

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