From fefca619c1b98f9fe27cfff0c32f39b751ee6a60 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Tue, 16 Nov 2021 20:28:00 +0100
Subject: kernel/vfs: add a capacity field to fs_wait_response

---
 src/kernel/vfs/request.c | 7 ++++---
 src/shared/syscalls.h    | 1 +
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/kernel/vfs/request.c b/src/kernel/vfs/request.c
index 9826982..f431eac 100644
--- a/src/kernel/vfs/request.c
+++ b/src/kernel/vfs/request.c
@@ -59,9 +59,10 @@ _Noreturn void vfs_request_pass2handler(struct vfs_request *req) {
 			goto fail; // can't copy buffer
 	}
 
-	res.len    = len;
-	res.id     = req->id;
-	res.offset = req->offset;
+	res.len      = len;
+	res.capacity = req->output.len;
+	res.id       = req->id;
+	res.offset   = req->offset;
 
 	if (!virt_cpy_to(handler->pages,
 				handler->awaited_req.res, &res, sizeof res))
diff --git a/src/shared/syscalls.h b/src/shared/syscalls.h
index f136ed2..8ec1a41 100644
--- a/src/shared/syscalls.h
+++ b/src/shared/syscalls.h
@@ -51,6 +51,7 @@ handle_t _syscall_fs_fork2(void);
 
 struct fs_wait_response {
 	int len; // how much was put in *buf
+	int capacity; // how much output can be accepted by the caller
 	int id;  // file id (returned by the open handler, passed to other calls)
 	int offset;
 };
-- 
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