Document the 'compression_type' option for qcow2, and mention that
streamOptimized vmdk supports compression, too.

Reported-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 docs/tools/qemu-img.rst | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/docs/tools/qemu-img.rst b/docs/tools/qemu-img.rst
index 15aeddc6d8..ca5a2773cf 100644
--- a/docs/tools/qemu-img.rst
+++ b/docs/tools/qemu-img.rst
@@ -106,7 +106,11 @@ by the used format or see the format descriptions below for details.
 
 .. option:: -c
 
-  Indicates that target image must be compressed (qcow format only).
+  Indicates that target image must be compressed (qcow/qcow2 and vmdk with
+  streamOptimized subformat only).
+
+  For qcow2, the compression algorithm can be specified with the ``-o
+  compression_type=...`` option (see below).
 
 .. option:: -h
 
@@ -776,7 +780,7 @@ Supported image file formats:
 
   QEMU image format, the most versatile format. Use it to have smaller
   images (useful if your filesystem does not supports holes, for example
-  on Windows), optional AES encryption, zlib based compression and
+  on Windows), optional AES encryption, zlib or zstd based compression and
   support of multiple VM snapshots.
 
   Supported options:
@@ -794,6 +798,17 @@ Supported image file formats:
   ``backing_fmt``
     Image format of the base image
 
+  ``compression_type``
+    This option configures which compression algorithm will be used for
+    compressed clusters on the image. Note that setting this option doesn't yet
+    cause the image to actually receive compressed writes. It is most commonly
+    used with the ``-c`` option of ``qemu-img convert``, but can also be used
+    with the ``compress`` filter driver or backup block jobs with compression
+    enabled.
+
+    Valid values are ``zlib`` and ``zstd``. For images that use
+    ``compat=0.10``, only ``zlib`` compression is available.
+
   ``encryption``
     If this option is set to ``on``, the image is encrypted with
     128-bit AES-CBC.
-- 
2.41.0

On Fri, Sep 01, 2023 at 12:24:30PM +0200, Kevin Wolf wrote:
> Document the 'compression_type' option for qcow2, and mention that
> streamOptimized vmdk supports compression, too.
> 
> Reported-by: Richard W.M. Jones <rjones@redhat.com>
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>

Looks good, so:

Reviewed-by: Richard W.M. Jones <rjones@redhat.com>

> ---
>  docs/tools/qemu-img.rst | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/docs/tools/qemu-img.rst b/docs/tools/qemu-img.rst
> index 15aeddc6d8..ca5a2773cf 100644
> --- a/docs/tools/qemu-img.rst
> +++ b/docs/tools/qemu-img.rst
> @@ -106,7 +106,11 @@ by the used format or see the format descriptions below for details.
>  
>  .. option:: -c
>  
> -  Indicates that target image must be compressed (qcow format only).
> +  Indicates that target image must be compressed (qcow/qcow2 and vmdk with
> +  streamOptimized subformat only).
> +
> +  For qcow2, the compression algorithm can be specified with the ``-o
> +  compression_type=...`` option (see below).
>  
>  .. option:: -h
>  
> @@ -776,7 +780,7 @@ Supported image file formats:
>  
>    QEMU image format, the most versatile format. Use it to have smaller
>    images (useful if your filesystem does not supports holes, for example
> -  on Windows), optional AES encryption, zlib based compression and
> +  on Windows), optional AES encryption, zlib or zstd based compression and
>    support of multiple VM snapshots.
>  
>    Supported options:
> @@ -794,6 +798,17 @@ Supported image file formats:
>    ``backing_fmt``
>      Image format of the base image
>  
> +  ``compression_type``
> +    This option configures which compression algorithm will be used for
> +    compressed clusters on the image. Note that setting this option doesn't yet
> +    cause the image to actually receive compressed writes. It is most commonly
> +    used with the ``-c`` option of ``qemu-img convert``, but can also be used
> +    with the ``compress`` filter driver or backup block jobs with compression
> +    enabled.
> +
> +    Valid values are ``zlib`` and ``zstd``. For images that use
> +    ``compat=0.10``, only ``zlib`` compression is available.
> +
>    ``encryption``
>      If this option is set to ``on``, the image is encrypted with
>      128-bit AES-CBC.

Rich.

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