design: update metadump v2 format to reflect rt dumps
Update the metadump v2 format documentation to add realtime device
dumps.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/design/XFS_Filesystem_Structure/metadump.asciidoc b/design/XFS_Filesystem_Structure/metadump.asciidoc
index a32d642..226622c 100644
--- a/design/XFS_Filesystem_Structure/metadump.asciidoc
+++ b/design/XFS_Filesystem_Structure/metadump.asciidoc
@@ -119,7 +119,16 @@
|=====
*xmh_incompat_flags*::
-Must be zero.
+A combination of the following flags:
+
+.Metadump v2 incompat flags
+[options="header"]
+|=====
+| Flag | Description
+| +XFS_MD2_INCOMPAT_RTDEVICE+ |
+Dump contains realtime device contents.
+
+|=====
*xmh_reserved*::
Must be zero.
@@ -143,6 +152,7 @@
| Value | Description
| 0 | Data device
| 1 | External log
+| 2 | Realtime device
|=====
The lower 54 bits determine the device address from which the dump data was
