[Bugs] [Bug 1364449] New: posix: honour fsync flags in posix_do_zerofill

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1364449

            Bug ID: 1364449
           Summary: posix: honour fsync flags in posix_do_zerofill
           Product: GlusterFS
           Version: mainline
         Component: posix
          Assignee: bugs at gluster.org
          Reporter: ravishankar at redhat.com
                CC: bugs at gluster.org



commit 6d994661db96cad43f26d0d1e2fba31dce9a76f5 introduced fallocate +
    FALLOC_FL_ZERO_RANGE to do posix_do_zerofill but did not do an fsync if
    O_SYNC or O_DSYNC fd flags were set. Prashant Pai pointed out performing
    fallocate(2) does not remove the necessity to do fsyncs if durability is
    desired:
http://linux-fsdevel.vger.kernel.narkive.com/bDmrAUlh/fallocate-falloc-fl-punch-hole

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