[sestarnix] Use IndexSet to track pending DirEntrys for labeling

Bug: 388463411
Change-Id: Ie1597935fd2d230628e3183e08c61aecf0957ccc
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1359311
Reviewed-by: Ambre Williams <[email protected]>
Fuchsia-Auto-Submit: Wez <[email protected]>
Commit-Queue: Wez <[email protected]>

Author: drwez

src/starnix/kernel/BUILD.gn

@@ -406,6 +406,7 @@ rustc_library("starnix_core") {
     "//third_party/rust_crates:fragile",
     "//third_party/rust_crates:futures",
     "//third_party/rust_crates:hkdf",
+    "//third_party/rust_crates:indexmap",
     "//third_party/rust_crates:itertools",
     "//third_party/rust_crates:linked-hash-map",
     "//third_party/rust_crates:lock_api",

src/starnix/kernel/security/selinux_hooks/mod.rs

@@ -20,6 +20,7 @@ use super::{FsNodeSecurityXattr, PermissionFlags, TaskState};
 use crate::task::{CurrentTask, FullCredentials, Task};
 use crate::vfs::{Anon, DirEntry, FileHandle, FileObject, FileSystem, FsNode, OutputBuffer};
 use audit::{Auditable, audit_decision, audit_todo_decision};
+use indexmap::IndexSet;
 use selinux::permission_check::PermissionCheck;
 use selinux::policy::FsUseType;
 use selinux::{
@@ -597,15 +598,15 @@ pub(super) struct FileObjectState {
 pub(super) struct FileSystemState {
     // Fields used prior to policy-load, to hold mount options, etc.
     mount_options: FileSystemMountOptions,
-    pending_entries: Mutex<HashSet<WeakKey<DirEntry>>>,
+    pending_entries: Mutex<IndexSet<WeakKey<DirEntry>>>,
 
     // Set once the initial policy has been loaded, taking into account `mount_options`.
     label: OnceLock<FileSystemLabel>,
 }
 
 impl FileSystemState {
     fn new(mount_options: FileSystemMountOptions) -> Self {
-        Self { mount_options, pending_entries: Mutex::new(HashSet::new()), label: OnceLock::new() }
+        Self { mount_options, pending_entries: Mutex::new(IndexSet::new()), label: OnceLock::new() }
     }
 
     /// Returns the resolved `FileSystemLabel`, or `None` if no policy has yet been loaded.