[PATCH] libata: add ATA_QCFLAG_IO

Add a new qc flag ATA_QCFLAG_IO.  This flag gets set for normal IO
commands originating from SCSI midlayer.  This information will be
used by EH to determine transfer speed reconfiguration.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/scsi/libata-scsi.c

@@ -1188,6 +1188,7 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicm
 	u64 block;
 	u32 n_block;
 
+	qc->flags |= ATA_QCFLAG_IO;
 	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
 
 	if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||

include/linux/libata.h

@@ -161,7 +161,8 @@ enum {
 	ATA_QCFLAG_SG		= (1 << 1), /* have s/g table? */
 	ATA_QCFLAG_SINGLE	= (1 << 2), /* no s/g, just a single buffer */
 	ATA_QCFLAG_DMAMAP	= ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
-	ATA_QCFLAG_EH_SCHEDULED = (1 << 3), /* EH scheduled */
+	ATA_QCFLAG_IO		= (1 << 3), /* standard IO command */
+	ATA_QCFLAG_EH_SCHEDULED = (1 << 4), /* EH scheduled */
 
 	/* host set flags */
 	ATA_HOST_SIMPLEX	= (1 << 0),	/* Host is simplex, one DMA channel per host_set only */