Mark Lord wrote:
Tejun Heo wrote:
..
sd forces disk revalidation (and thus ordered reconfiguration) if you
change cache mode via /sys/class/scsi_disk/X\:0\:0\:0/cache_type.
That's not implemented for libata --> the emulation in libata-scsi
rejects any attempt at a MODE_SELECT command, which is what the sysfs
attr triggers.
Wasn't there a patch to implement MODE_SELECT in libata once upon a time?
A couple iterations from Douglas Gilbert, probably in linux-scsi archives...
BTW, libata needs to trap IDENTIFY*DEVICE and update its cached copy of
the identify page, whenever MODE SELECT or another independent entity
issues IDENTIFY*DEVICE.
Jeff
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