kernel: start cleaning up VfsRequest

* I'm being more strict about the linked list state to hopefully ensure
  I'm not leaking any references.
* vfsreq_create was renamed to vfsreq_dispatchcopy as that name feels more
  clear. It copies its argument, and dispatches it.
* Requests for user backends are now handled more like requests for kernel
  backends - there's an accept() function that accepts a request.

1 files changed, 11 insertions, 4 deletions

diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index 9b0746a..5771b6a 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -85,7 +85,7 @@ hid_t _sys_open(const char __user *path, long len, int flags) {
 		memcpy(path_buf, path_buf + mount->prefix_len, len);
 	}
 
-	vfsreq_create((VfsReq) {
+	vfsreq_dispatchcopy((VfsReq) {
 		.type = VFSOP_OPEN,
 		.input = {
 			.kern = true,
@@ -198,7 +198,7 @@ static long simple_vfsop(
 			req.input.buf = buf;
 			req.input.len = len;
 		}
-		vfsreq_create(req);
+		vfsreq_dispatchcopy(req);
 	} else if (h->type == HANDLE_PIPE) {
 		if (vfsop == VFSOP_READ || vfsop == VFSOP_WRITE) {
 			/* already checked if this is the correct pipe end */
@@ -238,7 +238,7 @@ long _sys_remove(hid_t hid) {
 		hs_close(proc_cur->hs, hid);
 		SYSCALL_RETURN(-EACCES);
 	}
-	vfsreq_create((VfsReq) {
+	vfsreq_dispatchcopy((VfsReq) {
 		.type = VFSOP_REMOVE,
 		.id = h->file_id,
 		.caller = proc_cur,
@@ -271,7 +271,14 @@ hid_t _sys_fs_wait(char __user *buf, long max_len, struct ufs_request __user *re
 	proc_cur->awaited_req.max_len = max_len;
 	proc_cur->awaited_req.res     = res;
 
-	vfs_backend_tryaccept(backend); // sets return value
+	// TODO maybe i should use the postqueue stuff here
+	if (backend->queue) {
+		VfsReq *req = backend->queue;
+		backend->queue = req->queue_next;
+		req->queue_next = NULL;
+		vfsback_useraccept(req);
+	}
+
 	return -1; // dummy
 }