docs: update shared filesystem documentation and tests

(1) Update annotations documentation to reflect new shared filesystem
    options (virtio-fs, inline-virtio-fs, virtio-fs-nydus, none).
(2) Replace virtio-9p references with inline-virtio-fs in config doc.
(3) Update drop-in configuration tests to use 'none' instead of 'virtio-9p'

Signed-off-by: Alex Lyn <alex.lyn@antgroup.com>

src/libs/kata-types/src/annotations/mod.rs

@@ -257,7 +257,7 @@ pub const KATA_ANNO_CFG_HYPERVISOR_ENABLE_ROOTLESS_HYPERVISOR: &str =
     "io.katacontainers.config.hypervisor.rootless";
 
 // Hypervisor Shared File System related annotations
-/// A sandbox annotation to specify the shared file system type, either inline-virtio-fs (default), virtio-9p, virtio-fs or virtio-fs-nydus.
+/// A sandbox annotation to specify the shared file system type, either virtio-fs(default), inline-virtio-fs, virtio-fs-nydus or none.
 pub const KATA_ANNO_CFG_HYPERVISOR_SHARED_FS: &str =
     "io.katacontainers.config.hypervisor.shared_fs";
 /// A sandbox annotations to specify virtio-fs vhost-user daemon path.

src/libs/kata-types/src/config/drop_in.rs

@@ -346,7 +346,7 @@ mod drop_in_directory_handling {
 
             let dropin_override_data = r#"
                 [hypervisor.qemu]
-                shared_fs = "virtio-9p"
+                shared_fs = "none"
                 [runtime]
                 vfio_mode="vfio"
             "#;
@@ -372,7 +372,7 @@ mod drop_in_directory_handling {
             assert_eq!(config.hypervisor["qemu"].device_info.default_bridges, 4);
             assert_eq!(
                 config.hypervisor["qemu"].shared_fs.shared_fs.as_deref(),
-                Some("virtio-9p")
+                Some("none")
             );
             assert!(config.runtime.debug);
             assert!(config.runtime.sandbox_cgroup_only);

src/libs/kata-types/src/config/hypervisor/mod.rs

@@ -1418,12 +1418,13 @@ impl SecurityInfo {
     }
 }
 
-/// Configuration information for shared filesystems, such as virtio-9p and virtio-fs.
+/// Configuration information for shared filesystems, such as virtio-fs-nydus and virtio-fs.
 #[derive(Clone, Debug, Default, Deserialize, Serialize)]
 pub struct SharedFsInfo {
     /// Type of shared file system to use:
     /// - `virtio-fs` (default)
-    /// - `virtio-9p`
+    /// - `inline-virtio-fs`
+    /// - `virtio-fs-nydus`
     /// - `none` (disables shared filesystem)
     pub shared_fs: Option<String>,
 
@@ -1476,7 +1477,7 @@ impl SharedFsInfo {
     /// Adjusts the shared filesystem configuration after loading from a configuration file.
     ///
     /// Handles default values for `shared_fs` type, `virtio-fs` specific settings
-    /// (daemon path, cache mode, DAX), and `virtio-9p` msize.
+    /// (daemon path, cache mode, DAX) or `inline-virtio-fs` settings.
     pub fn adjust_config(&mut self) -> Result<()> {
         if self.shared_fs.as_deref() == Some(NO_VIRTIO_FS) {
             self.shared_fs = None;
@@ -1503,7 +1504,7 @@ impl SharedFsInfo {
     /// Validates the shared filesystem configuration.
     ///
     /// Checks the validity of the selected `shared_fs` type and
-    /// performs specific validations for `virtio-fs` and `virtio-9p` settings.
+    /// performs specific validations for `virtio-fs` and `inline-virtio-fs` settings.
     pub fn validate(&self) -> Result<()> {
         match self.shared_fs.as_deref() {
             None => Ok(()),