From 140972727f77ae91085be934ca5376a66676a7c9 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 13 Nov 2024 21:45:04 -0500
Subject: kernel: vfs: Add vnode cache implementation

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/include/sys/sysctl.h |  1 +
 sys/include/sys/vnode.h  | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

(limited to 'sys/include')

diff --git a/sys/include/sys/sysctl.h b/sys/include/sys/sysctl.h
index 0f1df26..9623137 100644
--- a/sys/include/sys/sysctl.h
+++ b/sys/include/sys/sysctl.h
@@ -39,6 +39,7 @@
 #define KERN_OSTYPE         0
 #define KERN_OSRELEASE      1
 #define KERN_VERSION        2
+#define KERN_VCACHE_TYPE    3
 
 /*
  * Option types (i.e., int, string, etc) for
diff --git a/sys/include/sys/vnode.h b/sys/include/sys/vnode.h
index 3f3b011..33d5b17 100644
--- a/sys/include/sys/vnode.h
+++ b/sys/include/sys/vnode.h
@@ -31,6 +31,7 @@
 #define _SYS_VNODE_H_
 
 #include <sys/types.h>
+#include <sys/queue.h>
 #include <sys/atomic.h>
 #include <sys/sio.h>
 
@@ -44,10 +45,18 @@ struct vnode {
     void *data;
     const struct vops *vops;
     uint32_t refcount;
+    TAILQ_ENTRY(vnode) vcache_link;
 };
 
 #define vfs_vref(VP) (atomic_inc_int(&(VP)->refcount))
 
+/* vcache types */
+#if defined(_KERNEL)
+#define VCACHE_TYPE_NONE   0
+#define VCACHE_TYPE_PROC   1
+#define VCACHE_TYPE_GLOBAL 2
+#endif  /* KERNEL */
+
 /* Vnode type flags */
 #define VNON    0x00    /* Uninitialized */
 #define VREG    0x01    /* Regular file */
@@ -86,6 +95,12 @@ struct vops {
 
 extern struct vnode *g_root_vnode;
 
+int vfs_vcache_type(void);
+int vfs_vcache_migrate(int newtype);
+
+int vfs_vcache_enter(struct vnode *vp);
+struct vnode *vfs_recycle_vnode(void);
+
 int vfs_alloc_vnode(struct vnode **res, int type);
 int vfs_release_vnode(struct vnode *vp);
 
-- 
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