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Fix race condition during cache attach #858

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robertbaldyga
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Fixes #839

After attaching new cache device handle all the IOs in Pass-Through mode
until all the d2c requests are completed.

Signed-off-by: Robert Baldyga <[email protected]>
Cache attach operation is not supposed to complete unless all the d2c
requests are completed, thus need to handle it asynchronously.

Signed-off-by: Robert Baldyga <[email protected]>
@robertbaldyga robertbaldyga merged commit e630b81 into Open-CAS:master Nov 25, 2024
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DC during D2C->WT transition
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