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rules: skip btrfs check if devices are not ready in 64-btrfs.rules (s…
…ystemd#8304) If any devices are marked with 'SYSTEMD_READY=0' then we shouldn't run any btrfs check on them. Indeed there's no point in running "btrfs ready" on devices that already have SYSTEMD_READY=0 set. Most probably such devices are members of a higher layer aggregate device such as dm-multipath or software RAID. Doing IO on them wastes time at best, and may cause delays, timeouts, or even hangs at worst (think active-passive multipath or degraded RAID, for example). It was initially reported at: https://bugzilla.opensuse.org/show_bug.cgi?id=872929
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