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[PULL,19/37] specs/qcow2: Clarify that compressed clusters have the COPIED bit reset

Message ID 20180515154033.19899-20-kwolf@redhat.com
State New
Headers show
Series [PULL,01/37] block-backend: simplify blk_get_aio_context | expand

Commit Message

Kevin Wolf May 15, 2018, 3:40 p.m. UTC 
From: Alberto Garcia <berto@igalia.com>

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>
---
 docs/interop/qcow2.txt | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
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Patch

diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt
index feb711fb6a..8e1547ded2 100644
--- 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: