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由 Daniel Stodden 提交于
We cannot read backend state within bdev operations, because it risks grabbing the state change before xenbus gets to do it. Fixed by tracking deferral with a frontend switch to Closing. State exposure isn't strictly necessary, but the backends won't mind. For a 'clean' deferral this seems actually a more decent protocol than raising errors. Signed-off-by: NDaniel Stodden <daniel.stodden@citrix.com> Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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