[pve-devel] [PATCH docs v1 2/5] virtiofs: add explanation for cache=metadata behavior

[Markus Frank]

Adds a description of the `cache=metadata` mode and references the
upstream patch that introduced it.

Signed-off-by: Markus Frank <m.frank at proxmox.com>
---
 qm.adoc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/qm.adoc b/qm.adoc
index 8b9e096..74f8304 100644
--- a/qm.adoc
+++ b/qm.adoc
@@ -1315,7 +1315,9 @@ has been configured in the resource mapping. Additionally, you can set the
 `cache` option to either `always`, `never`, `metadata`, or `auto` (default:
 `auto`), depending on your requirements. How the different caching modes behave
 can be read https://lwn.net/Articles/774495/[here under the "Caching Modes"
-section].
+section]. The https://gitlab.com/virtio-fs/virtiofsd/-/commit/598ca8e[`metadata`]
+policy is similar to `never`, but it allows guests to cache filesystem metadata,
+such as dcache and attr.
 
 The `virtiofsd` supports ACL and xattr passthrough (can be enabled with the
 `expose-acl` and `expose-xattr` options), allowing the guest to access ACLs and
-- 
2.39.5