specs/qcow2: Clarify that compressed clusters have the COPIED bit reset

Compressed clusters are not supposed to have the COPIED bit set, but
this is not made explicit in the specs, so let's document it.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 74552e1d6e858d3159cb0c0e188e80bc9248e337.1523376013.git.berto@igalia.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>

diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt
index feb711fb6a88187c36716518e0ed1954a6fc6eda..8e1547ded27b1bb6da4007018fde09b24c5d8765 100644 (file)
--- a/docs/interop/qcow2.txt
+++ b/docs/interop/qcow2.txt
@@ -400,10 +400,10 @@ L2 table entry:
               62:   0 for standard clusters
                     1 for compressed clusters
 
-              63:   0 for a cluster that is unused or requires COW, 1 if its
-                    refcount is exactly one. This information is only accurate
-                    in L2 tables that are reachable from the active L1
-                    table.
+              63:   0 for clusters that are unused, compressed or require COW.
+                    1 for standard clusters whose refcount is exactly one.
+                    This information is only accurate in L2 tables
+                    that are reachable from the active L1 table.
 
 Standard Cluster Descriptor: