nfs: Fix NFSv2 STATFS procedure parsing

Ticket: #5140

rust/src/nfs/log.rs

@@ -82,12 +82,18 @@ fn nfs_common_header(
     state: &NFSState, tx: &NFSTransaction, js: &mut JsonBuilder,
 ) -> Result<(), JsonError> {
     js.set_uint("version", state.nfs_version as u64)?;
-    if state.nfs_version < 4 {
+    if state.nfs_version == 3 {
         if let Some(proc) = NfsProc3::from_u(tx.procedure) {
             js.set_string("procedure", &proc.to_str().to_uppercase())?;
         } else {
             js.set_string("procedure", &format!("{}", tx.procedure))?;
         }
+    } else if state.nfs_version <= 2 {
+        if let Some(proc) = NfsProc2::from_u(tx.procedure) {
+            js.set_string("procedure", &proc.to_str().to_uppercase())?;
+        } else {
+            js.set_string("procedure", &format!("{}", tx.procedure))?;
+        }
     } else if let Some(proc) = NfsProc4::from_u(tx.procedure) {
         js.set_string("procedure", &proc.to_str().to_uppercase())?;
     } else {

rust/src/nfs/types.rs

@@ -15,6 +15,31 @@
  * 02110-1301, USA.
  */
 
+/* RFC 1094, section '2.2 Server Procedures' */
+#[repr(u32)]
+#[derive(EnumStringU32)]
+#[allow(non_camel_case_types)]
+pub enum NfsProc2 {
+    NULL = 0,
+    GETATTR = 1,
+    SETATTR = 2,
+    ROOT = 3,
+    LOOKUP = 4,
+    READLINK = 5,
+    READ = 6,
+    WRITECACHE = 7,
+    WRITE = 8,
+    CREATE = 9,
+    REMOVE = 10,
+    RENAME = 11,
+    LINK = 12,
+    SYMLINK = 13,
+    MKDIR = 14,
+    RMDIR = 15,
+    READDIR = 16,
+    STATFS = 17,
+}
+
 /* RFC 1813, section '3. Server Procedures' */
 pub const NFSPROC3_NULL: u32 = 0;
 pub const NFSPROC3_GETATTR: u32 = 1;