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qcow2: Prohibit backing file changes in 'qemu-img amend'

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This was deprecated back in bc5ee6da7 (qcow2: Deprecate use of
qemu-img amend to change backing file), and no one in the meantime has
given any reasons why it should be supported.  Time to make change
attempts a hard error (but for convenience, specifying the _same_
backing chain is not forbidden).  Update a couple of iotests to match.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210503213600.569128-2-eblake@redhat.com>
Reviewed-by: Connor Kuehl <ckuehl@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2021-05-03 14:35:59 -07:00 • committed by Kevin Wolf
parent 2842ff2d81
commit 5a385bf5c5
6 changed files with 25 additions and 24 deletions
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12
docs/system/removed-features.rst
View file

@ -491,6 +491,18 @@ topologies described with -smp include all possible cpus, i.e.
The ``enforce-config-section`` property was replaced by the
``-global migration.send-configuration={on|off}`` option.
qemu-img amend to adjust backing file (removed in 6.1)
''''''''''''''''''''''''''''''''''''''''''''''''''''''
The use of ``qemu-img amend`` to modify the name or format of a qcow2
backing image was never fully documented or tested, and interferes
with other amend operations that need access to the original backing
image (such as deciding whether a v3 zero cluster may be left
unallocated when converting to a v2 image). Any changes to the
backing chain should be performed with ``qemu-img rebase -u`` either
before or after the remaining changes being performed by amend, as
appropriate.
Block devices
-------------