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

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 3131adc..641a61a 100644 (file)
--- a/drivers/ata/libata-scsi.c
+++ b/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) &&

diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c
index d6c37bc..e2d9497 100644 (file)
--- a/drivers/ata/libata-transport.c
+++ b/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))

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 36ce37b..5c8bac6 100644 (file)
--- a/include/linux/libata.h
+++ b/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 */