vfs request refactor pt1

1 files changed, 43 insertions, 0 deletions

diff --git a/src/kernel/vfs/request.h b/src/kernel/vfs/request.h
new file mode 100644
index 0000000..3021c6f
--- /dev/null
+++ b/src/kernel/vfs/request.h
@@ -0,0 +1,43 @@
+#pragma once
+
+enum vfs_backend_type {
+	VFS_BACK_ROOT,
+	VFS_BACK_USER,
+};
+
+// describes something which can act as an access function
+struct vfs_backend {
+	enum vfs_backend_type type;
+
+	// only used with VFS_BACK_USER
+	struct process *handler;
+	struct process *queue;
+};
+
+enum vfs_operation {
+	VFSOP_OPEN,
+	VFSOP_WRITE,
+};
+
+// describes an in-process vfs call
+struct vfs_request {
+	enum vfs_operation type;
+	union {
+		struct {
+			char *path;
+			int path_len;
+		} open;
+		struct {
+			char __user *buf;
+			int buf_len;
+			int id; // filled in by the kernel
+		} rw;
+	};
+
+	struct process *caller;
+	struct vfs_backend *backend;
+};
+
+_Noreturn void vfs_request_create(struct vfs_request);
+_Noreturn void vfs_request_pass2handler(struct vfs_request *);
+_Noreturn void vfs_request_finish(struct vfs_request *, int ret);