BlockCache-read cache支持 (#521)

支持block cache的读缓存

user/apps/test-blockcache/.cargo/config.toml

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+[build]
+target = "x86_64-unknown-linux-musl"

user/apps/test-blockcache/.gitignore

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+/target
+Cargo.lock
+/install/

user/apps/test-blockcache/Cargo.toml

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+[package]
+name = "test-blockcache"
+version = "0.1.0"
+edition = "2021"
+description = "用于测试blockcac小程序"
+authors = [ "ZZJJWarth <2678328250@qq.com>" ]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

user/apps/test-blockcache/Makefile

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+# The toolchain we use.
+# You can get it by running DragonOS' `tools/bootstrap.sh`
+TOOLCHAIN="+nightly-2023-08-15-x86_64-unknown-linux_dragonos-gnu"
+RUSTFLAGS+="-C target-feature=+crt-static -C link-arg=-no-pie"
+
+# 如果是在dadk中编译，那么安装到dadk的安装目录中
+INSTALL_DIR?=$(DADK_CURRENT_BUILD_DIR)
+# 如果是在本地编译，那么安装到当前目录下的install目录中
+INSTALL_DIR?=./install
+
+
+run:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) run
+
+build:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) build
+
+clean:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) clean
+
+test:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) test
+
+doc:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) doc
+
+run-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) run --release
+
+build-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) build --release
+
+clean-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) clean --release
+
+test-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) test --release
+
+.PHONY: install
+install: 
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) install --path . --no-track --root $(INSTALL_DIR) --force

user/apps/test-blockcache/README.md

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+## 程序说明
+用于测试BlockCache的测试程序
+本程序生成一个文件，并开始对这个文件进行单纯的读操作（共读10000次）
+
+## 使用方法
+
+1. 打开系统的/bin目录
+2. 输入指令exec test-blockcache即可开始测试

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

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+use std::fs::File;
+use std::io::{BufReader, Read, Seek, SeekFrom, Write};
+
+fn main() -> std::io::Result<()> {
+    let file_size_bytes: u64 = 512;
+    let mut file = File::create("large_file")?;
+    file.seek(std::io::SeekFrom::Start(file_size_bytes - 1))?;
+    file.write_all(&[0])?;
+    let mut file = File::open("large_file")?;
+    // let mut reader = BufReader::new(file);
+    let mut buffer = [0; 512];
+    let mut count = 0;
+    loop {
+        count += 1;
+        file.seek(SeekFrom::Start(0))?;
+        let bytes_read = file.read_exact(&mut buffer)?;
+        if count > 10000 {
+            break;
+        }
+    }
+    Ok(())
+}