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[SCSI] sd: Update thin provisioning support

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Add support for the Thin Provisioning VPD page and use the TPU and TPWS
bits to switch between UNMAP and WRITE SAME(16) for discards.  If no TP
VPD page is present we fall back to old scheme where the max descriptor
count combined with the max lba count are used trigger UNMAP.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Martin K. Petersen
2010-09-10 01:22:07 -04:00
committed by James Bottomley
parent a36c61f902
commit 045d3fe766
2 changed files with 44 additions and 5 deletions
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3
drivers/scsi/sd.h
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@@ -63,6 +63,9 @@ struct scsi_disk {
unsigned first_scan : 1;
unsigned thin_provisioning : 1;
unsigned unmap : 1;
unsigned tpws : 1;
unsigned tpu : 1;
unsigned tpvpd : 1;
};
#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)