tree f3e2d1a4430cbd9353b2959e3f00b4a1906ad467
parent f68b3afe45051d43e9f9277c6f1404670e1b99d2
author Martin K. Petersen <martin.petersen@oracle.com> 1305684803 -0400
committer Jeff Garzik <jgarzik@pobox.com> 1305852361 -0400

libata: Use Maximum Write Same Length to report discard size limit

Previously we used Maximum Unmap LBA Count in the Block Limits VPD to
signal the maximum number of sectors we could handle in a single Write
Same command.

Starting with SBC3r26 the Block Limits VPD has an explicit limit on the
number of blocks in a Write Same. This means we can stop abusing a field
related to the Unmap command and let our SAT use the proper value in the
VPD (Maximum Write Same Length).

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Cc: stable@kernel.org