kern: vfs: Add namei() prototype function

Introduce a namei() prototype function to build upon when implementing
core namei() logic. The prototype simply implemenets the path parsing
and mimicks a UNIX-like (shell) namei output.

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/src/sys/include/sys/namei.h b/src/sys/include/sys/namei.h
new file mode 100644
index 0000000..588dbd3
--- /dev/null
+++ b/src/sys/include/sys/namei.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SYS_NAMEI_H_
+#define _SYS_NAMEI_H_ 1
+
+#include <os/vnode.h>
+
+/*
+ * Represents namei data that can be used for
+ * looking up files
+ *
+ * @path: Full path to lookup
+ * @flags: Flags to use
+ * @vp: Vnode result is written here
+ */
+struct nameidata {
+    const char *path;
+    uint32_t flags;
+    struct vnode *vp;
+};
+
+#if defined(_KERNEL)
+int namei(struct nameidata *ndp);
+#endif  /* _KERNEL */
+#endif  /* !_SYS_NAMEI_H_ */