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libata: add ATA_HORKAGE_NOTRIM 

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>
This commit is contained in:
Arne Fitzenreiter 2015-07-15 13:54:36 +02:00 committed by Zefan Li
parent 460baab8b4
commit 3330d7bdad
2 changed files with 4 additions and 1 deletions
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3
drivers/ata/libata-scsi.c
View File

@ -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))

2
include/linux/libata.h
View File

@ -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 */