From a3ef8f8ad5248e3424113871950eb9c80eeeb99e Mon Sep 17 00:00:00 2001
From: GnoCiYeH <118462160+GnoCiYeH@users.noreply.github.com>
Date: Thu, 31 Aug 2023 19:52:32 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=94=B9RamFS=E7=9B=AE=E5=89=8D?=
 =?UTF-8?q?=E5=AD=98=E5=9C=A8=E7=9A=84BUG=20(#354)?=
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* 修改RamFS目前存在的BUG
---
 kernel/src/filesystem/ramfs/mod.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/kernel/src/filesystem/ramfs/mod.rs b/kernel/src/filesystem/ramfs/mod.rs
index 3dd893b9..e2cef7c7 100644
--- a/kernel/src/filesystem/ramfs/mod.rs
+++ b/kernel/src/filesystem/ramfs/mod.rs
@@ -114,6 +114,33 @@ impl RamFS {
 }
 
 impl IndexNode for LockedRamFSInode {
+    fn truncate(&self, len: usize) -> Result<(), SystemError> {
+        let mut inode = self.0.lock();
+
+        //如果是文件夹，则报错
+        if inode.metadata.file_type == FileType::Dir {
+            return Err(SystemError::EINVAL);
+        }
+
+        //当前文件长度大于_len才进行截断，否则不操作
+        if inode.data.len() > len {
+            inode.data.resize(len, 0);
+        }
+        return Ok(());
+    }
+
+    fn close(&self, _data: &mut FilePrivateData) -> Result<(), SystemError> {
+        return Ok(());
+    }
+
+    fn open(
+        &self,
+        _data: &mut FilePrivateData,
+        _mode: &super::vfs::file::FileMode,
+    ) -> Result<(), SystemError> {
+        return Ok(());
+    }
+
     fn read_at(
         &self,
         offset: usize,