Revision 433c63aa lib/backend.py
| b/lib/backend.py | ||
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@return: snapshot disk path |
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|
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""" |
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if disk.children: |
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if len(disk.children) == 1: |
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# only one child, let's recurse on it |
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return BlockdevSnapshot(disk.children[0]) |
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else: |
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# more than one child, choose one that matches |
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for child in disk.children: |
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if child.size == disk.size: |
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# return implies breaking the loop |
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return BlockdevSnapshot(child) |
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if disk.dev_type == constants.LD_DRBD8: |
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if not disk.children: |
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_Fail("DRBD device '%s' without backing storage cannot be snapshotted",
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disk.unique_id) |
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return BlockdevSnapshot(disk.children[0]) |
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elif disk.dev_type == constants.LD_LV: |
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r_dev = _RecursiveFindBD(disk) |
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if r_dev is not None: |
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# FIXME: choose a saner value for the snapshot size |
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# let's stay on the safe side and ask for the full size, for now |
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return r_dev.Snapshot(disk.size) |
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else: |
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