From 93c729aefb2596c14bbe135b0126d964342ab77b Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Fri, 17 Oct 2025 12:37:49 -0400
Subject: kern: vfs: Add 'create' virtual file operation

The create VOP allows the caller to create a node within the parent
directory of a filesystem represented by a vnode.

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 src/sys/include/os/vnode.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src/sys/include/os')

diff --git a/src/sys/include/os/vnode.h b/src/sys/include/os/vnode.h
index 1bef1e2..628ba68 100644
--- a/src/sys/include/os/vnode.h
+++ b/src/sys/include/os/vnode.h
@@ -32,6 +32,7 @@
 
 #include <sys/types.h>
 #include <sys/atomic.h>
+#include <sys/namei.h>
 
 /* Forward declarations */
 struct vnode;
@@ -82,6 +83,16 @@ struct vop_rw_data {
     struct vnode *vp;
 };
 
+/*
+ * Arguments to create an entry within a
+ * filesystem
+ *
+ * @ndp: Path component to create
+ */
+struct vop_create_args {
+    struct nameidata *ndp;
+};
+
 /*
  * Represents operations that can be performed on
  * a specific vnode. These are implemented as callbacks
@@ -89,6 +100,7 @@ struct vop_rw_data {
 struct vop {
     int(*lookup)(struct vop_lookup_args *args);
     int(*reclaim)(struct vnode *vp, int flags);
+    int(*create)(struct vop_create_args *args);
     ssize_t(*write)(struct vop_rw_data *data);
     ssize_t(*read)(struct vop_rw_data *data);
 };
@@ -176,4 +188,16 @@ ssize_t vop_read(struct vnode *vp, char *data, off_t off, size_t len);
  */
 int vop_reclaim(struct vnode *vp, int flags);
 
+/*
+ * Create a node within a specific filesystem or
+ * directory
+ *
+ * @vp: Vnode of parent directory
+ * @ndp: Namei descriptor of path component
+ *
+ * Returns zero on success, otherwise a less than zero
+ * value on failure.
+ */
+int vop_create(struct vnode *vp, struct nameidata *ndp);
+
 #endif  /* !_OS_VNODE_H_ */
-- 
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