The commit is pushed to "branch-rh8-4.18.0-305.3.1.vz8.7.x-ovz" and will appear
at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-305.3.1.vz8.7.2
------>
commit 9b17869549ea9c83e6dfd1402673bd4a38ed59a7
Author: Kirill Tkhai <[email protected]>
Date: Thu Aug 5 19:09:11 2021 +0300
dm-qcow2: Avoid reading R1R2 pages if cluster is not COW
This had been enabled before COW clusters became supported
for debug purposes (to introduce R1R2 support initially).
Now, it is not needed, since that code is tested on real
compressed or internal snapshot clusters COW.
Signed-off-by: Kirill Tkhai <[email protected]>
---
drivers/md/dm-qcow2-map.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/md/dm-qcow2-map.c b/drivers/md/dm-qcow2-map.c
index 263a43a67108..64bb185ac7e9 100644
--- a/drivers/md/dm-qcow2-map.c
+++ b/drivers/md/dm-qcow2-map.c
@@ -1919,12 +1919,10 @@ static int parse_metadata(struct qcow2 *qcow2, struct
qio **qio,
return pos;
map->data_clu_pos = pos;
- if (!write)
+ if (!write || !map->clu_is_cow)
return 0;
/* Now refcounters table/block */
- if (!qcow2->hdr.nb_snapshots && !map->compressed)
- return 0;
ret = handle_r1r2_maps(qcow2, pos, qio, &map->r1,
&map->r2, map->compressed);
return ret < 0 ? ret : 0;
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