[Qemu-block] [PATCH v4 4/4] block/rbd: add deprecation documentation for filename keyvalue pairs

[Jeff Cody]

Signed-off-by: Jeff Cody <address@hidden>
---
 qemu-deprecated.texi | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 1b9c007f12..8d285b281e 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -190,6 +190,21 @@ used instead.
 In order to prevent QEMU from automatically opening an image's backing
 chain, use ``"backing": null'' instead.
 
address@hidden rbd keyvalue pair encoded filenames: "" (since 3.1.0)
+
+Options for ``rbd'' should be specified according to its runtime options,
+like other block drivers.  Legacy parsing of keyvalue pair encoded
+filenames is useful to open images with the old format for backing files;
+These image files should be updated to use the current format.
+
+Example of legacy encoding:
+
address@hidden:@{"file.driver":"rbd", "file.filename":"rbd:rbd/name"@}}
+
+The above, converted to the current supported format:
+
address@hidden:@{"file.driver":"rbd", "file.pool":"rbd", "file.image":"name"@}}
+
 @subsection vio-spapr-device device options
 
 @subsubsection "irq": "" (since 3.0.0)
-- 
2.17.1