os/BlueStore: NCB fix for leaked space when bdev_async_discard is enabled
Fix calls bdev->discard_drain() before calling store_allocator() to make sure all freed space is reflected in the allocator before destaging it
The fix set a timeout for the drain call (500msec) and if expires will not store the allocator (forcing a recovery on the next startup) Fixes: https://tracker.ceph.com/issues/65298 Signed-off-by: Gabriel BenHanokh <gbenhano@redhat.com>
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