block: Add a disk flag to block integrity profile

So far we have relied on the app tag size to determine whether a disk
has been formatted with T10 protection information or not. However, not
all target devices provide application tag storage.

Add a flag to the block integrity profile that indicates whether the
disk has been formatted with protection information.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@dev.mellanox.co.il>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c
index 801c41851a01..1e971c6f8c2b 100644
--- a/drivers/scsi/sd_dif.c
+++ b/drivers/scsi/sd_dif.c
@@ -270,7 +270,13 @@ void sd_dif_config_host(struct scsi_disk *sdkp)
                   "Enabling DIX %s protection\n", disk->integrity->name);
 
         /* Signal to block layer that we support sector tagging */
-        if (dif && type && sdkp->ATO) {
+        if (dif && type) {
+
+                disk->integrity->flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
+
+                if (!sdkp)
+                        return;
+
                 if (type == SD_DIF_TYPE3_PROTECTION)
                         disk->integrity->tag_size = sizeof(u16) + sizeof(u32);
                 else