添加mount系统调用 (#561)

* Modify dadk config to switch NovaShell revision

* finish primary build of mount(2), usable now

* 使用read_from_cstr函数优化代码可读性 , 针对文件系统新增错误EUNSUPFS

* small changes

* 添加系统调用文档

* cargo fmt

* Revert "small changes"

This reverts commit e1991314ce.

* 修复用户程序参数传入错误

* Revert "small changes"

This reverts commit e1991314ce.

* 解决合并冲突，最终提交

* 将dadk_config切换为相对路径以修复依赖问题

* Update settings.json

* Delete user/apps/test-mount/LICENSE

* 换用更好的c字符串读取函数，优化系统调用函数注释，修复错误处理bug，删除无用文件，修改测试程序readme

* 修改用户程序readme

* 代码格式化，初级版本

* 初级版本，未实现文件系统管理器，未支持设备挂载

* 为文件系统添加name方法，返回文件系统名字字符串，为挂载查询服务

* mount系统调用：添加统一文件系统初始化管理器

* null

* 解除冲突

* 删除无用kdebug

user/apps/test-mount/.gitignore

@@ -0,0 +1,3 @@
+/target
+Cargo.lock
+/install/

user/apps/test-mount/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "test-mount"
+version = "0.1.0"
+edition = "2021"
+description = "test the new mount syscall"
+authors = [ "xiaolin2004 <1553367438@qq.com>" ]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+libc="0.2"

user/apps/test-mount/Makefile

@@ -0,0 +1,56 @@
+TOOLCHAIN="+nightly-2023-08-15-x86_64-unknown-linux-gnu"
+RUSTFLAGS+=""
+
+ifdef DADK_CURRENT_BUILD_DIR
+# 如果是在dadk中编译，那么安装到dadk的安装目录中
+	INSTALL_DIR = $(DADK_CURRENT_BUILD_DIR)
+else
+# 如果是在本地编译，那么安装到当前目录下的install目录中
+	INSTALL_DIR = ./install
+endif
+
+ifeq ($(ARCH), x86_64)
+	export RUST_TARGET=x86_64-unknown-linux-musl
+else ifeq ($(ARCH), riscv64)
+	export RUST_TARGET=riscv64gc-unknown-linux-gnu
+else 
+# 默认为x86_86，用于本地编译
+	export RUST_TARGET=x86_64-unknown-linux-musl
+endif
+
+run:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) run --target $(RUST_TARGET)
+
+build:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) build --target $(RUST_TARGET)
+
+clean:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) clean --target $(RUST_TARGET)
+
+test:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) test --target $(RUST_TARGET)
+
+doc:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) doc --target $(RUST_TARGET)
+
+fmt:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) fmt
+
+fmt-check:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) fmt --check
+
+run-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) run --target $(RUST_TARGET) --release
+
+build-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) build --target $(RUST_TARGET) --release
+
+clean-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) clean --target $(RUST_TARGET) --release
+
+test-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) test --target $(RUST_TARGET) --release
+
+.PHONY: install
+install:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) install --target $(RUST_TARGET) --path . --no-track --root $(INSTALL_DIR) --force

user/apps/test-mount/README.md

@@ -0,0 +1,3 @@
+# test-mount
+
+用于测试mount系统调用的用户程序

user/apps/test-mount/src/main.rs

@@ -0,0 +1,17 @@
+use core::ffi::{c_char, c_void};
+use libc::{mount, MS_BIND};
+
+fn main() {
+    let source = b"\0".as_ptr() as *const c_char;
+    let target = b"/mnt/tmp\0".as_ptr() as *const c_char;
+    let fstype = b"ramfs\0".as_ptr() as *const c_char;
+    let flags = MS_BIND;
+    let data = std::ptr::null() as *const c_void;
+    let result = unsafe { mount(source, target, fstype, flags, data) };
+
+    if result == 0 {
+        println!("Mount successful");
+    } else {
+        println!("Mount failed");
+    }
+}