[PATCH 03/19] nvme: Enforce extended LBA format for fabrics metadata

[Max Gurtovoy <maxg@xxxxxxxxxxxx>]

An extended LBA is a larger LBA that is created when metadata associated
with the LBA is transferred contiguously with the LBA data (AKA
interleaved). The metadata may be either transferred as part of the LBA
(creating an extended LBA) or it may be transferred as a separate
contiguous buffer of data. According to the NVMeoF spec, a fabrics ctrl
supports only an Extended LBA format. Fail revalidation in case we have a
spec violation. Also initialize the integrity profile for the block device
for fabrics ctrl.

Signed-off-by: Max Gurtovoy <maxg@xxxxxxxxxxxx>
Signed-off-by: Israel Rukshin <israelr@xxxxxxxxxxxx>
---
 drivers/nvme/host/core.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 15d0863..86e39f6 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1825,7 +1825,7 @@ static void nvme_update_disk_info(struct gendisk *disk,
 	blk_mq_unfreeze_queue(disk->queue);
 }
 
-static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
+static int __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
 {
 	struct nvme_ns *ns = disk->private_data;
 
@@ -1853,11 +1853,21 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
 			ns->features |= NVME_NS_EXT_LBAS;
 
 		/*
+		 * For Fabrics, only metadata as part of extended data LBA is
+		 * supported. Fail in case of a spec violation.
+		 */
+		if (ns->ctrl->ops->flags & NVME_F_FABRICS) {
+			if (WARN_ON_ONCE(!(ns->features & NVME_NS_EXT_LBAS)))
+				return -EINVAL;
+		}
+
+		/*
 		 * For PCI, Extended logical block will be generated by the
 		 * controller.
 		 */
 		if (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED) {
-			if (!(ns->features & NVME_NS_EXT_LBAS))
+			if (ns->ctrl->ops->flags & NVME_F_FABRICS ||
+			    !(ns->features & NVME_NS_EXT_LBAS))
 				ns->features |= NVME_NS_MD_HOST_SUPPORTED;
 		}
 	}
@@ -1872,6 +1882,7 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
 		revalidate_disk(ns->head->disk);
 	}
 #endif
+	return 0;
 }
 
 static int nvme_revalidate_disk(struct gendisk *disk)
@@ -1896,7 +1907,10 @@ static int nvme_revalidate_disk(struct gendisk *disk)
 		goto free_id;
 	}
 
-	__nvme_revalidate_disk(disk, id);
+	ret = __nvme_revalidate_disk(disk, id);
+	if (ret)
+		goto free_id;
+
 	ret = nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
 	if (ret)
 		goto free_id;
@@ -3582,7 +3596,8 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
 	ns->disk = disk;
 
-	__nvme_revalidate_disk(disk, id);
+	if (__nvme_revalidate_disk(disk, id))
+		goto out_free_disk;
 
 	if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
 		ret = nvme_nvm_register(ns, disk_name, node);
@@ -3607,6 +3622,8 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	return;
  out_put_disk:
 	put_disk(ns->disk);
+ out_free_disk:
+	del_gendisk(ns->disk);
  out_unlink_ns:
 	mutex_lock(&ctrl->subsys->lock);
 	list_del_rcu(&ns->siblings);
-- 
1.8.3.1