btrfs: zoned: load active zone information from devices
The ZNS specification defines a limit on the number of zones that can be in the implicit open, explicit open or closed conditions. Any zone with such condition is defined as an active zone and correspond to any zone that is being written or that has been only partially written. If the maximum number of active zones is reached, we must either reset or finish some active zones before being able to chose other zones for storing data. Load queue_max_active_zones() and track the number of active zones left on the device. Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
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