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formatstorage: Document qcow2 default version change

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Based on discussion after commit f432114d9c was pushed it was pointed
out that the documentation still mentions the older version.

Fix the documentation to state the new version and introduce ambiguity
for future updates.

Fixes: f432114d9c
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Peter Krempa 2024-03-12 12:32:52 +01:00
parent 03852c85af
commit 239cfeaf55
1 changed files with 9 additions and 4 deletions
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docs/formatstorage.rst
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@ -700,10 +700,15 @@ host filesystem. It can contain the following child elements:
Encryption <formatstorageencryption.html>`__ page for more information.
``compat``
Specify compatibility level. So far, this is only used for ``type='qcow2'``
volumes. Valid values are ``0.10`` and ``1.1`` so far, specifying QEMU
version the images should be compatible with. If the ``feature`` element is
present, 1.1 is used. :since:`Since 1.1.0` If omitted, 0.10 is used.
:since:`Since 1.1.2`
volumes. Valid values are ``0.10`` (QCOW2 v2) and ``1.1`` (QCOW2 v3) so far.
The values were meant to specify QEMU version the images should be compatible
with.
The default, if the ``feature`` element is present is ``1.1``. :since:`Since 1.1.0`
If ``feature`` is not present, ``0.10`` was used :since:`Since 1.1.2` and
:since:`Since 10.2.0` ``1.1`` is used as it's the default of ``qemu-img``.
Any tool depending on a specific version should specify this field explicitly.
``nocow``
Turn off COW of the newly created volume. So far, this is only valid for a
file image in btrfs file system. It will improve performance when the file