Review Request: better handling of Removable property for volumes in soliddevice engine

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This review has been submitted with commit 928a77d199e76bda7008b4cfdfd42587f6138452 by Alberto Villa to branch master.

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On Sept. 9, 2012, 7:28 a.m., Andriy Gapon wrote:
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> (Updated Sept. 9, 2012, 7:28 a.m.)
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> Review request for Plasma, Solid and Alberto Villa.
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> Description
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> Currently the code in SolidDeviceEngine::populateDeviceData sets volume's Removable property in straightforward fashion:
> - tries to cast volume's (immediate) parent device to Solid::StorageDrive
> - if that succeeds, checks isHotpluggable() and isRemovable() properties of the parent
> The problem is that there could be intermediate devices in solid device hierarchy between the volume and its Solid::StorageDrive ancestor, for example partition-type devices.
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> The proposed code walks up the hierarchy to try harder to find Solid::StorageDrive ancestor of a given device.
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> BTW, I think that getAncestorOfType() helper function introduced in the proposed change can be useful for other code too, so it might make sense to nominate it for inclusion into Solid API.
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> Diffs
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>   plasma/generic/dataengines/soliddevice/soliddeviceengine.cpp 608da25 
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> Diff: http://git.reviewboard.kde.org/r/105432/diff/
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> Testing
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> Thanks,
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> Andriy Gapon
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