libata: add ATA_HORKAGE_NOTRIM

Some devices lose data on TRIM whether queued or not.  This patch adds
a horkage to disable TRIM.

tj: Collapsed unnecessary if() nesting.
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org

drivers/ata/libata-scsi.c

@@ -2568,7 +2568,8 @@ static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
 		rbuf[14] = (lowest_aligned >> 8) & 0x3f;
 		rbuf[15] = lowest_aligned;
 
-		if (ata_id_has_trim(args->id)) {
+		if (ata_id_has_trim(args->id) &&
+		    !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
 			rbuf[14] |= 0x80; /* LBPME */
 
 			if (ata_id_has_zero_after_trim(args->id) &&

drivers/ata/libata-transport.c

@@ -569,6 +569,8 @@ show_ata_dev_trim(struct device *dev,
 
 	if (!ata_id_has_trim(ata_dev->id))
 		mode = "unsupported";
+	else if (ata_dev->horkage & ATA_HORKAGE_NOTRIM)
+		mode = "forced_unsupported";
 	else if (ata_dev->horkage & ATA_HORKAGE_NO_NCQ_TRIM)
 			mode = "forced_unqueued";
 	else if (ata_fpdma_dsm_supported(ata_dev))

include/linux/libata.h

@@ -431,6 +431,8 @@ enum {
 	ATA_HORKAGE_WD_BROKEN_LPM = (1 << 21),	/* some WDs have broken LPM */
 	ATA_HORKAGE_ZERO_AFTER_TRIM = (1 << 22),/* guarantees zero after trim */
 	ATA_HORKAGE_NO_NCQ_LOG	= (1 << 23),	/* don't use NCQ for log read */
+	ATA_HORKAGE_NOTRIM	= (1 << 24),	/* don't use TRIM */
+
 
 	 /* DMA mask for user DMA control: User visible values; DO NOT
 	    renumber */