From 652f11380e44b7c2083fa19d706f5cddf7fe0718 Mon Sep 17 00:00:00 2001
From: Ayush Ranjan <ayushranjan@google.com>
Date: Mon, 26 Oct 2020 16:13:04 -0700
Subject: [vfs] kernfs: Implement LRU cache for kernfs dentries.

Much like the VFS2 gofer client, kernfs too now caches dentries. The size of the
LRU cache is configurable via mount options.
Have adopted the same reference semantics from gofer client dentry.

Only sysfs and procfs use this LRU cache. The rest of the kernfs users (devpts,
fusefs, host, pipefs, sockfs) still use the no cache approach.

PiperOrigin-RevId: 339139835
---
 pkg/sentry/fsimpl/kernfs/BUILD | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

(limited to 'pkg/sentry/fsimpl/kernfs/BUILD')

diff --git a/pkg/sentry/fsimpl/kernfs/BUILD b/pkg/sentry/fsimpl/kernfs/BUILD
index 4de1e6922..aaad67ab8 100644
--- a/pkg/sentry/fsimpl/kernfs/BUILD
+++ b/pkg/sentry/fsimpl/kernfs/BUILD
@@ -3,6 +3,18 @@ load("//tools/go_generics:defs.bzl", "go_template_instance")
 
 licenses(["notice"])
 
+go_template_instance(
+    name = "dentry_list",
+    out = "dentry_list.go",
+    package = "kernfs",
+    prefix = "dentry",
+    template = "//pkg/ilist:generic_list",
+    types = {
+        "Element": "*Dentry",
+        "Linker": "*Dentry",
+    },
+)
+
 go_template_instance(
     name = "fstree",
     out = "fstree.go",
@@ -26,17 +38,6 @@ go_template_instance(
     },
 )
 
-go_template_instance(
-    name = "dentry_refs",
-    out = "dentry_refs.go",
-    package = "kernfs",
-    prefix = "Dentry",
-    template = "//pkg/refsvfs2:refs_template",
-    types = {
-        "T": "Dentry",
-    },
-)
-
 go_template_instance(
     name = "static_directory_refs",
     out = "static_directory_refs.go",
@@ -84,7 +85,7 @@ go_template_instance(
 go_library(
     name = "kernfs",
     srcs = [
-        "dentry_refs.go",
+        "dentry_list.go",
         "dynamic_bytes_file.go",
         "fd_impl_util.go",
         "filesystem.go",
@@ -105,6 +106,7 @@ go_library(
         "//pkg/log",
         "//pkg/refs",
         "//pkg/refsvfs2",
+        "//pkg/sentry/fs/fsutil",
         "//pkg/sentry/fs/lock",
         "//pkg/sentry/kernel/auth",
         "//pkg/sentry/kernel/time",
-- 
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