On 01.03.21 18:28, Connor Kuehl wrote:
The contents of this patch were initially developed and posted by Han
Han[1], however, it appears the original patch was not applied. Since
then, the relevant documentation has been moved and adapted to a new
format.
I've taken most of the original wording and tweaked it according to
some of the feedback from the original patch submission. I've also
adapted it to restructured text, which is the format the documentation
currently uses.
[1] https://lists.nongnu.org/archive/html/qemu-block/2019-10/msg01253.html
Reported-by: Han Han <h...@redhat.com>
Co-developed-by: Han Han <h...@redhat.com>
Fixes: https://bugzilla.redhat.com/1763105
Signed-off-by: Connor Kuehl <cku...@redhat.com>
---
docs/tools/qemu-img.rst | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/docs/tools/qemu-img.rst b/docs/tools/qemu-img.rst
index b615aa8419..5cc585dc27 100644
--- a/docs/tools/qemu-img.rst
+++ b/docs/tools/qemu-img.rst
@@ -866,6 +866,18 @@ Supported image file formats:
issue ``lsattr filename`` to check if the NOCOW flag is set or not
(Capital 'C' is NOCOW flag).
+ ``data_file``
+ Pathname that refers to a file that will store all guest data. If
+ this option is used, the qcow2 file will only contain the image's
+ metadata.
I think I would like a note here about the fact that when passing this
option to qemu-img create, the given data file will be newly created,
i.e. if it already contains data, all that data will be lost. And
perhaps also note that qemu-img amend on the other hand will only change
the reference in the qcow2 file, so the given file should already exist
and will not be overwritten.
(“Pathname that refers to a file” sounds like the file may already exist
before this operation, which may give people ideas. (Not that the ideas
were bad, it’s just that they have to take care. Referencing qemu-img
amend should give them a hint on how to do it right.))
Max
+
+ ``data_file_raw``
+ If this option is set to ``on``, QEMU will always keep the external
+ data file consistent as a standalone read-only raw image. The default
+ value is ``off``.
+
+ This option can only be enabled if ``data_file`` is set.
+
``Other``
QEMU also supports various other image file formats for
