From 67c847f8660ed73db1017f2ca8b01bfe4eb9ba1b Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Wed, 8 Sep 2021 19:40:58 +0200
Subject: scaffolding for user fs dispatch

---
 src/kernel/vfs/backend.c | 14 ++++++++++++++
 src/kernel/vfs/backend.h |  6 +++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

(limited to 'src/kernel/vfs')

diff --git a/src/kernel/vfs/backend.c b/src/kernel/vfs/backend.c
index 9a2b777..0f684a0 100644
--- a/src/kernel/vfs/backend.c
+++ b/src/kernel/vfs/backend.c
@@ -14,6 +14,20 @@ _Noreturn void vfs_backend_dispatch(struct vfs_backend *backend, struct vfs_op o
 		case VFS_BACK_ROOT:
 			int ret = vfs_root_handler(&req);
 			vfs_backend_finish(&req, ret);
+		case VFS_BACK_USER:
+			process_current->state = PS_WAITS4FS;
+			if (backend->handler == NULL) { // backend not ready yet
+				if (backend->queue == NULL) {
+					backend->queue = process_current;
+					process_switch_any();
+				} else {
+					panic(); // TODO implement a proper queue
+				}
+			} else {
+				if (backend->handler->state != PS_WAITS4REQUEST)
+					panic(); // invalid state
+				panic(); // TODO
+			}
 		default:
 			panic();
 	}
diff --git a/src/kernel/vfs/backend.h b/src/kernel/vfs/backend.h
index fe46db1..bf16ee7 100644
--- a/src/kernel/vfs/backend.h
+++ b/src/kernel/vfs/backend.h
@@ -6,9 +6,13 @@ enum vfs_backend_type {
 	VFS_BACK_USER,
 };
 
-// describes something which can acts as an access function
+// 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;
 };
 
 // describes an in-progress vfs call
-- 
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