On Tue, 2017-04-25 at 14:39 -0700, Omar Sandoval wrote: > On Tue, Apr 25, 2017 at 01:37:45PM -0700, Bart Van Assche wrote: > > Show the SCSI CDB, .eh_eflags and .result for pending SCSI commands > > in /sys/kernel/debug/block/*/mq/*/dispatch and */rq_list. > > Only thing I noticed was that the only other caller I see has buf[70]. > No idea if that's a meaningful number. For the sake of this not getting > bike-shedded to death, Neither length is sufficient to avoid truncation of e.g. ATA pass-through commands or commands with variable length CDBs. However, from the point of view of debugging queue lockups the most useful information in a SCSI command are the first two bytes of the CDB. The chosen buffer length is definitely enough to make sure that these two bytes will be reported. Bart.
