[Bugs] [Bug 1361483] posix: leverage FALLOC_FL_ZERO_RANGE in zerofill fop

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1361483



--- Comment #3 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/15044 committed in release-3.8 by Pranith
Kumar Karampuri (pkarampu at redhat.com) 
------
commit fe1054110ac54750ca0333a727d83b14a98e165e
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

    Backport of http://review.gluster.org/#/c/15037/

    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: Iceaf0cbc57c52dac63540872e8538d79e8dee631
    BUG: 1361483
    Signed-off-by: Ravishankar N <ravishankar at redhat.com>
    Reviewed-on: http://review.gluster.org/15044
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>

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