Revise the content of root field for the mountinfo file

kernel/src/fs/path/dentry.rs

@@ -332,6 +332,27 @@ impl Dentry {
         }
         Ok(())
     }
+
+    /// Gets the absolute path name of this `Dentry` within the filesystem.
+    pub(super) fn path_name(&self) -> String {
+        let mut path_name = self.name().to_string();
+        let mut current_dir = self.this();
+
+        while let Some(parent_dir) = current_dir.parent() {
+            path_name = {
+                let parent_name = parent_dir.name();
+                if parent_name != "/" {
+                    parent_name + "/" + &path_name
+                } else {
+                    parent_name + &path_name
+                }
+            };
+            current_dir = parent_dir;
+        }
+
+        debug_assert!(path_name.starts_with('/'));
+        path_name
+    }
 }
 
 #[inherit_methods(from = "self.inode")]

kernel/src/fs/path/mod.rs

@@ -102,6 +102,8 @@ impl Path {
     /// Gets the absolute path.
     ///
     /// It will resolve the mountpoint automatically.
+    //
+    // FIXME: This method needs to be aware of the current process's root path.
     pub fn abs_path(&self) -> String {
         let mut path_name = self.effective_name();
         let mut current_dir = self.this();
@@ -126,6 +128,8 @@ impl Path {
     ///
     /// If it is the root of a mount, it will go up to the mountpoint
     /// to get the name of the mountpoint recursively.
+    //
+    // FIXME: This method needs to be aware of the current process's root path.
     fn effective_name(&self) -> String {
         if !self.is_mount_root() {
             return self.dentry.name();

kernel/src/fs/path/mount.rs

@@ -534,7 +534,7 @@ impl Mount {
             let mount_id = mount.id();
             let parent = mount.parent().and_then(|parent| parent.upgrade());
             let parent_id = parent.as_ref().map_or(mount_id, |p| p.id());
-            let root = Path::new_fs_root(mount.clone()).abs_path();
+            let root = mount.root_dentry().path_name();
             let mount_point = if let Some(parent) = parent {
                 if let Some(mount_point_dentry) = mount.mountpoint() {
                     Path::new(parent, mount_point_dentry).abs_path()

test/src/syscall/gvisor/blocklists/proc_test

@@ -35,7 +35,6 @@ ProcSysVmMmapMinAddr.HasNumericValue
 ProcSysVmOvercommitMemory.HasNumericValue
 ProcFilesystems.PresenceOfShmMaxMniAll
 ProcMounts.IsSymlink
-ProcSelfMountinfo.RequiredFieldsArePresent
 ProcSelfMounts.RequiredFieldsArePresent
 Proc.GetdentsEnoent
 Proc.PidTidIOAccounting