[Bugs] [Bug 1166020] self-heal-algorithm with option "full" doesn't heal sparse files correctly

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1166020



--- Comment #5 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9480 committed in master by Pranith Kumar
Karampuri (pkarampu at redhat.com) 
------
commit 0f84f8e8048367737a2dd6ddf0c57403e757441d
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.

    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: I787b06a553803247f43a40c00139cb483a22f9ca
    BUG: 1166020
    Signed-off-by: Ravishankar N <ravishankar at redhat.com>
    Reviewed-on: http://review.gluster.org/9480
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>
    Tested-by: Pranith Kumar Karampuri <pkarampu at redhat.com>

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