[Bugs] [Bug 1187547] self-heal-algorithm with option "full" doesn't heal sparse files correctly

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1187547



--- Comment #2 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9515 committed in release-3.6 by Raghavendra
Bhat (raghavendra at redhat.com) 
------
commit f397d7edb85c1e4b78c4cac176dc8a0afe8cf9a8
Author: Ravishankar N <ravishankar at redhat.com>
Date:   Fri Jan 23 11:12:54 2015 +0530

    afr: Don't write to sparse regions of sink.

    Backport of http://review.gluster.org/9480

    Problem:
    When data-self-heal-algorithm is set to 'full', shd just reads from
    source and writes to sink. If source file happened to be sparse (VM
    workloads), we end up actually writing 0s to the corresponding regions
    of the sink causing it to lose its sparseness.

    Fix:
    If the source file is sparse, and the data read from source and sink are
    both zeros for that range, skip writing that range to the sink.

    Change-Id: Id23d953fe2c8c64cde5ce3530b52ef91a7583891
    BUG: 1187547
    Signed-off-by: Ravishankar N <ravishankar at redhat.com>
    Reviewed-on: http://review.gluster.org/9515
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>
    Reviewed-by: Raghavendra Bhat <raghavendra at redhat.com>

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