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

[bugzilla at redhat.com]

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



--- Comment #2 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/15100 committed in master by Pranith Kumar
Karampuri (pkarampu at redhat.com) 
------
commit cf51bc699646359be92969024a52c225e7ee55a1
Author: Ravishankar N <ravishankar at redhat.com>
Date:   Fri Aug 5 11:22:18 2016 +0000

    posix: honour fsync flags in posix_do_zerofill

    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

    So fixed it to honour the fd flags.

    Change-Id: I27ae90b429185d0af29a5e632c4a8b242075a899
    BUG: 1364449
    Signed-off-by: Ravishankar N <ravishankar at redhat.com>
    Reviewed-on: http://review.gluster.org/15100
    Reviewed-by: Prashanth Pai <ppai at redhat.com>
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Niels de Vos <ndevos at redhat.com>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>

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