[Bugs] [Bug 1361249] posix: leverage FALLOC_FL_ZERO_RANGE in zerofill fop

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1361249



--- Comment #3 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/15037 committed in master by Pranith Kumar
Karampuri (pkarampu at redhat.com) 
------
commit 6d994661db96cad43f26d0d1e2fba31dce9a76f5
Author: Ravishankar N <ravishankar at redhat.com>
Date:   Thu Jul 28 20:42:45 2016 +0530

    posix: leverage FALLOC_FL_ZERO_RANGE in zerofill fop

    posix_zerofill() implements zerofilling of a given (offset,length) by
    doing a writev in a loop followed by an optional fsync on the file.
    fallocate(2) has a FALLOC_FL_ZERO_RANGE flag which does away with all
    this and provides the same result (from a userspace application point of
    view) with a single syscall. This patch attempts the zerofill with the
    latter and falls back to the former if it fails.

    Tested using a libgfapi based C program on XFS and observed using gdb that
    posix_zerofill()'s call to fallocate with FALLOC_FL_ZERO_RANGE was a
    success.

    Change-Id: I77e9b7de0d59c255f06b0c39c43a276990081727
    BUG: 1361249
    Signed-off-by: Ravishankar N <ravishankar at redhat.com>
    Reviewed-on: http://review.gluster.org/15037
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>

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