[PATCH 3.4 026/107] libata: add ATA_HORKAGE_NOTRIM

lizf
2016-03-16T08:08:43Z

From: Arne Fitzenreiter <arne_f@ipfire.org>

3.4.111-rc1 review patch. If anyone has any objections, please let me know.

------------------

commit 71d126fd28de2d4d9b7b2088dbccd7ca62fad6e0 upstream.

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>
[lizf: Backported to 3.4:
- adjust context
- drop changes to show_ata_dev_trim()]
Signed-off-by: Zefan Li <lizefan@huawei.com>
---
drivers/ata/libata-scsi.c | 3 ++-
include/linux/libata.h | 2 ++
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 15863a4..94ccbc1 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2461,7 +2461,8 @@ 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; /* TPE */

if (ata_id_has_zero_after_trim(args->id))
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 35e7f71..9736dbe 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -402,6 +402,8 @@ enum {
ATA_HORKAGE_BROKEN_FPDMA_AA = (1 << 15), /* skip AA */
ATA_HORKAGE_DUMP_ID = (1 << 16), /* dump IDENTIFY data */
ATA_HORKAGE_MAX_SEC_LBA48 = (1 << 17), /* Set max sects to 65535 */
+ ATA_HORKAGE_NOTRIM = (1 << 24), /* don't use TRIM */
+

/* DMA mask for user DMA control: User visible values; DO NOT
renumber */
--
1.9.1