btrfs: cleanup device states define BTRFS_DEV_STATE_FLUSH_SENT
Currently device state is being managed by each individual int variable such as struct btrfs_device::is_tgtdev_for_dev_replace. Instead of that declare btrfs_device::dev_state BTRFS_DEV_STATE_FLUSH_SENT and use the bit operations. Signed-off-by: NAnand Jain <anand.jain@oracle.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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