From 8ebf44dca970f200aabdbdeb8afda6a60df07da6 Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Wed, 1 Apr 2026 18:57:59 +0100
Subject: [PATCH] libfs: add support for special files not backed by a
 filesystem

---
 lib/libfs/file.c            | 5 +++++
 lib/libfs/include/fs/file.h | 1 +
 lib/libfs/interface/seek.c  | 2 +-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/libfs/file.c b/lib/libfs/file.c
index 9c927c5..3bb36de 100644
--- a/lib/libfs/file.c
+++ b/lib/libfs/file.c
@@ -1,5 +1,10 @@
 #include "file.h"
 
+void fs_file_set_ops(struct fs_file *f, const struct fs_file_ops *ops)
+{
+	f->f_ops = ops;
+}
+
 struct fs_inode *fs_file_get_inode(const struct fs_file *f)
 {
 	return f->f_inode;
diff --git a/lib/libfs/include/fs/file.h b/lib/libfs/include/fs/file.h
index b28ed8c..4d796d8 100644
--- a/lib/libfs/include/fs/file.h
+++ b/lib/libfs/include/fs/file.h
@@ -23,6 +23,7 @@ struct fs_file_ops {
 		*f_readdir)(struct fs_file *, struct xpc_buffer *, off_t *);
 };
 
+extern void fs_file_set_ops(struct fs_file *f, const struct fs_file_ops *ops);
 extern struct fs_inode *fs_file_get_inode(const struct fs_file *f);
 extern size_t fs_file_get_cursor(const struct fs_file *f);
 extern enum fs_status fs_file_read(
diff --git a/lib/libfs/interface/seek.c b/lib/libfs/interface/seek.c
index bc494f6..fe26af4 100644
--- a/lib/libfs/interface/seek.c
+++ b/lib/libfs/interface/seek.c
@@ -39,7 +39,7 @@ extern kern_status_t fs_msg_seek(
 		return KERN_OK;
 	}
 
-	if (new_offset > f->f_inode->i_size) {
+	if (f->f_inode && new_offset > f->f_inode->i_size) {
 		*out_err = EINVAL;
 		return KERN_OK;
 	}