I can't help with the call traces. But several (not all) of the hard resetting link messages are hallmark cases where the SCSI command timer default of 30 seconds looks like it's being hit while the drive itself is hung up doing a sector read recovery (multiple attempts). It's worth seeing if 'smartctl -l scterc <dev>' will report back that SCT is supported and that it's just disabled, meaning you can change this to something sane like with 'smartctl -l 70,70 <dev>' which will make the drive time out before the linux kernel command timer. That'll let Btrfs do the right thing, rather than constantly getting poked in both eyes by link resets.
Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
