From 06500303303ec14711b4f995e2058e12703f0f2c Mon Sep 17 00:00:00 2001
From: LoGin <longjin@DragonOS.org>
Date: Wed, 2 Aug 2023 17:33:16 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=AD=A3null=E8=AE=BE=E5=A4=87?=
 =?UTF-8?q?=E4=BB=A5=E5=8F=8Azero=E8=AE=BE=E5=A4=87=E6=97=A0=E6=B3=95open?=
 =?UTF-8?q?=E3=80=81=E8=A1=8C=E4=B8=BA=E4=B8=8D=E7=AC=A6=E5=90=88=E9=A2=84?=
 =?UTF-8?q?=E6=9C=9F=E7=9A=84=E9=97=AE=E9=A2=98=20(#314)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 kernel/src/filesystem/devfs/null_dev.rs | 18 +++++-------------
 kernel/src/filesystem/devfs/zero_dev.rs |  4 ++--
 2 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/kernel/src/filesystem/devfs/null_dev.rs b/kernel/src/filesystem/devfs/null_dev.rs
index 2a1ed6e7..b64e118c 100644
--- a/kernel/src/filesystem/devfs/null_dev.rs
+++ b/kernel/src/filesystem/devfs/null_dev.rs
@@ -70,11 +70,11 @@ impl IndexNode for LockedNullInode {
     }
 
     fn open(&self, _data: &mut FilePrivateData, _mode: &FileMode) -> Result<(), SystemError> {
-        Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)
+        return Ok(());
     }
 
     fn close(&self, _data: &mut FilePrivateData) -> Result<(), SystemError> {
-        Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)
+        return Ok(());
     }
 
     fn metadata(&self) -> Result<Metadata, SystemError> {
@@ -109,19 +109,11 @@ impl IndexNode for LockedNullInode {
     fn read_at(
         &self,
         _offset: usize,
-        len: usize,
-        buf: &mut [u8],
+        _len: usize,
+        _buf: &mut [u8],
         _data: &mut FilePrivateData,
     ) -> Result<usize, SystemError> {
-        if buf.len() < len {
-            return Err(SystemError::EINVAL);
-        }
-
-        for i in 0..len {
-            buf[i] = 0;
-        }
-
-        return Ok(len);
+        return Ok(0);
     }
 
     /// 写设备 - 应该调用设备的函数读写，而不是通过文件系统读写
diff --git a/kernel/src/filesystem/devfs/zero_dev.rs b/kernel/src/filesystem/devfs/zero_dev.rs
index fd37bda5..7385fe3c 100644
--- a/kernel/src/filesystem/devfs/zero_dev.rs
+++ b/kernel/src/filesystem/devfs/zero_dev.rs
@@ -70,11 +70,11 @@ impl IndexNode for LockedZeroInode {
     }
 
     fn open(&self, _data: &mut FilePrivateData, _mode: &FileMode) -> Result<(), SystemError> {
-        Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)
+        return Ok(());
     }
 
     fn close(&self, _data: &mut FilePrivateData) -> Result<(), SystemError> {
-        Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)
+        return Ok(());
     }
 
     fn metadata(&self) -> Result<Metadata, SystemError> {