[Bugs] [Bug 1351024] Implement API to get page aligned iobufs in iobuf.c

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1351024



--- Comment #2 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/14826 committed in release-3.7 by Pranith
Kumar Karampuri (pkarampu at redhat.com) 
------
commit af1ab7266edf91216e27484c505c78401f092e13
Author: Krutika Dhananjay <kdhananj at redhat.com>
Date:   Tue Jun 7 16:27:34 2016 +0530

    libglusterfs: Implement API that provides page-aligned iobufs

            Backport of: http://review.gluster.org/14672

    One of the consumers of a page aligned buffer would be posix's
    readv fop on O_DIRECT fds. Today the way it works is by getting
    a page-aligned buffer through calloc, pread()ing into this buffer
    and then copying its contents into a newly created iobuf's ptr.
    This results in an extra memcpy() which can be avoided if we could
    implement an api that would return an iobuf whose ptr is
    page-aligned. That way the iobuf->ptr can be directly passed to
    sys_pread() as a parameter by posix translator.

    Change-Id: Ie44c300dc773fef8e1669d609987d47dbd340ac2
    BUG: 1351024
    Signed-off-by: Krutika Dhananjay <kdhananj at redhat.com>
    Reviewed-on: http://review.gluster.org/14826
    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: Zhou Zhengping <johnzzpcrystal at gmail.com>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>

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