From e7d6d031e54ef1b1c7b589648a27eea84994549f Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Thu, 5 May 2022 18:31:56 +0200
Subject: kernel/vfs: rename the vfsreq funcs, merge vfsreq_finish &
 vfsreq_cancel

---
 src/kernel/vfs/request.c | 93 +++++++++++++++++++-----------------------------
 1 file changed, 37 insertions(+), 56 deletions(-)

(limited to 'src/kernel/vfs/request.c')

diff --git a/src/kernel/vfs/request.c b/src/kernel/vfs/request.c
index 7c1861d..fb196ee 100644
--- a/src/kernel/vfs/request.c
+++ b/src/kernel/vfs/request.c
@@ -6,10 +6,10 @@
 #include <kernel/vfs/root.h>
 #include <shared/mem.h>
 
-int vfs_request_create(struct vfs_request req_) {
+int vfsreq_create(struct vfs_request req_) {
 	struct vfs_request *req = kmalloc(sizeof *req);
 	memcpy(req, &req_, sizeof *req);
-	/* freed in vfs_request_finish or vfs_request_cancel */
+	/* freed in vfsreq_finish */
 
 	if (req->backend)
 		req->backend->refcount++;
@@ -20,7 +20,7 @@ int vfs_request_create(struct vfs_request req_) {
 	}
 
 	if (!req->backend || !req->backend->potential_handlers)
-		return vfs_request_finish(req, -1);
+		return vfsreq_finish(req, -1);
 
 	switch (req->backend->type) {
 		case VFS_BACK_ROOT:
@@ -39,46 +39,7 @@ int vfs_request_create(struct vfs_request req_) {
 	}
 }
 
-int vfs_backend_accept(struct vfs_backend *backend) {
-	struct vfs_request *req = backend->queue;
-	struct process *handler = backend->handler;
-	struct fs_wait_response res = {0};
-	int len = 0;
-
-	if (!handler) return -1;
-	assert(handler->state == PS_WAITS4REQUEST);
-	assert(!handler->handled_req);
-
-	if (!req) return -1;
-	backend->queue = req->queue_next;
-
-	if (req->input.buf) {
-		len = min(req->input.len, handler->awaited_req.max_len);
-		if (!virt_cpy(handler->pages, handler->awaited_req.buf, 
-					req->input.kern ? NULL : req->caller->pages, req->input.buf, len))
-			goto fail; // can't copy buffer
-	}
-
-	res.len      = len;
-	res.capacity = req->output.len;
-	res.id       = req->id;
-	res.offset   = req->offset;
-	res.op       = req->type;
-
-	if (!virt_cpy_to(handler->pages,
-				handler->awaited_req.res, &res, sizeof res))
-		goto fail; // can't copy response struct
-
-	process_transition(handler, PS_RUNNING);
-	handler->handled_req = req;
-	req->backend->handler = NULL;
-	regs_savereturn(&handler->regs, 0);
-	return 0;
-fail:
-	panic_unimplemented(); // TODO
-}
-
-int vfs_request_finish(struct vfs_request *req, int ret) {
+int vfsreq_finish(struct vfs_request *req, int ret) {
 	if (req->type == VFSOP_OPEN && ret >= 0) {
 		// open() calls need special handling
 		// we need to wrap the id returned by the VFS in a handle passed to
@@ -115,23 +76,43 @@ int vfs_request_finish(struct vfs_request *req, int ret) {
 	return ret;
 }
 
-void vfs_request_cancel(struct vfs_request *req, int ret) {
-	// TODO merge with vfs_request_finish
-	if (req->caller) {
-		assert(req->caller->state == PS_WAITS4FS);
+int vfs_backend_accept(struct vfs_backend *backend) {
+	struct vfs_request *req = backend->queue;
+	struct process *handler = backend->handler;
+	struct fs_wait_response res = {0};
+	int len = 0;
 
-		if (req->input.kern)
-			kfree(req->input.buf_kern);
+	if (!handler) return -1;
+	assert(handler->state == PS_WAITS4REQUEST);
+	assert(!handler->handled_req);
 
-		// ret must always be negative, so it won't be confused with a success
-		if (ret > 0) ret = -ret;
-		if (ret == 0) ret = -1;
-		regs_savereturn(&req->caller->regs, ret);
-		process_transition(req->caller, PS_RUNNING);
+	if (!req) return -1;
+	backend->queue = req->queue_next;
+
+	if (req->input.buf) {
+		len = min(req->input.len, handler->awaited_req.max_len);
+		if (!virt_cpy(handler->pages, handler->awaited_req.buf, 
+					req->input.kern ? NULL : req->caller->pages, req->input.buf, len))
+			goto fail; // can't copy buffer
 	}
 
-	vfs_backend_refdown(req->backend);
-	kfree(req);
+	res.len      = len;
+	res.capacity = req->output.len;
+	res.id       = req->id;
+	res.offset   = req->offset;
+	res.op       = req->type;
+
+	if (!virt_cpy_to(handler->pages,
+				handler->awaited_req.res, &res, sizeof res))
+		goto fail; // can't copy response struct
+
+	process_transition(handler, PS_RUNNING);
+	handler->handled_req = req;
+	req->backend->handler = NULL;
+	regs_savereturn(&handler->regs, 0);
+	return 0;
+fail:
+	panic_unimplemented(); // TODO
 }
 
 void vfs_backend_refdown(struct vfs_backend *b) {
-- 
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