libata: SCT Write Same / DSM Trim

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Correct handling of devices with sector_size other that 512 bytes.

In the case of a 4Kn device sector_size it is possible to describe a much
larger DSM Trim than the current fixed default of 512 bytes.

This patch assumes the minimum descriptor is sector_size and fills out
the descriptor accordingly.

The ACS-2 specification is quite clear that the DSM command payload is
sized as number of 512 byte transfers so a 4Kn device will operate
correctly without this patch.

Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Acked-by: Tejun Heo <tj@kernel.org>

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Shaun Tancheff 2016-08-24 13:08:14 -05:00 • committed by Tejun Heo

parent 7b20309428

commit ef2d7392c4

1 changed files with 57 additions and 28 deletions

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drivers/ata/libata-scsi.c

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