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, 8 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block
index 279da08f7541..8df003963d99 100644
--- a/Documentation/ABI/testing/sysfs-block
+++ b/Documentation/ABI/testing/sysfs-block
@@ -53,6 +53,14 @@ Description:
                 512 bytes of data.
 
 
+What:           /sys/block/<disk>/integrity/device_is_integrity_capable
+Date:           July 2014
+Contact:        Martin K. Petersen <martin.petersen@oracle.com>
+Description:
+                Indicates whether a storage device is capable of storing
+                integrity metadata. Set if the device is T10 PI-capable.
+
+
 What:           /sys/block/<disk>/integrity/write_generate
 Date:           June 2008
 Contact:        Martin K. Petersen <martin.petersen@oracle.com>