May be better to use /sys/fs/btrfs/<uuid>/devices to find the device
to monitor, and then monitor them with blktrace - maybe there's some
courser granularity available there, I'm not sure. The thing is, as
far as Btrfs alone is concerned, a drive can be "bad" and you're
effectively degraded, while the drive is not missing. Unless it's
physical removed or somehow dead, it'll still be seen but can produce
all kinds of mayhem.

Chris Murphy
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