[Documentation] Initial setup for DFS v2 documentation structure

[Copilot]

The issue requests comprehensive Chinese documentation for DFS v2 covering file system operations (mount/unmount/format), file operations (open/close/read/write/seek), and directory operations (opendir/closedir/readdir/mkdir) with Mermaid sequence diagrams, code references, and refcount details.

Changes Made

• Created empty documentation/6.components/filesystem/dfsv2_zh.md file structure
• Analyzed DFS v2 architecture across key source files:
  • components/dfs/dfs_v2/src/dfs_file.c - File operations and descriptor management
  • components/dfs/dfs_v2/src/dfs_fs.c - Mount, unmount, mkfs implementations
  • components/dfs/dfs_v2/src/dfs_posix.c - POSIX API layer (open/close/mkdir/opendir)
  • components/dfs/dfs_v2/src/dfs_mnt.c - Mount tree management with refcounting
  • components/dfs/dfs_v2/include/ - Core data structures (dfs_file, dfs_vnode, dfs_dentry)

Status

Documentation file created but content generation incomplete due to technical issues. Follow-up required to populate with:

• Detailed operation flows with Mermaid sequence diagrams
• Code links to specific implementation points (e.g., dfs_file_open at line 565, dfs_mount at line 221)
• Reference counting behavior in mount tree and dentry operations
• Chinese language technical descriptions per RT-Thread standards

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature] 创建完整的DFS2 文档</issue_title>
<issue_description>### Describe problem solved by the proposed feature

在文档目录下创建完整的文件系统 DFS2 的文档：documentation/6.components/filesystem 目录下，加入：

• dfsv2_zh.md 中文文档
• 文档部分主要是针对 components/dfs/dfs_v2 代码，可以是 src，include，而不涉及到 components/dfs/dfs_v2/filesystems 中的代码。
• 文档部分需要覆盖到 文件系统的典型步骤，例如 装载文件系统，卸载文件系统，格式化文件系统；
• 文档部分需要覆盖到 文件操作的典型步骤，例如 文件打开，关闭，读，写，seek等；
• 文档部分需要覆盖到 目录操作的典型步骤，例如 目录打开，关闭，读取目录，seek，创建目录等；
• 每个典型步骤需要包括：
  • 对步骤的简单说明
  • 步骤的完整序列图，可以使用 mermaid sequenceDiagram 的图方式给出；
    • 在序列图上标准出关键点说明；
    • 特别关注到其中的一些refcount情况；
  • 对于图序列的完整说明，包括代码链接；

按照上述描述进行拆分工作，依次完成，特别是内容是和代码直接相关的，关键点都链接到代码具体位置。

Describe your preferred solution

No response

Describe possible alternatives

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature] 创建完整的DFS2 文档 #10865

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[github-actions]

👋 感谢您对 RT-Thread 的贡献！Thank you for your contribution to RT-Thread!

为确保代码符合 RT-Thread 的编码规范，请在你的仓库中执行以下步骤运行代码格式化工作流（如果格式化CI运行失败）。
To ensure your code complies with RT-Thread's coding style, please run the code formatting workflow by following the steps below (If the formatting of CI fails to run).

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🛠 操作步骤 | Steps

1. 前往 Actions 页面 | Go to the Actions page
   点击进入工作流 → | Click to open workflow →

2. 点击 Run workflow | Click Run workflow

• 设置需排除的文件/目录（目录请以"/"结尾）
  Set files/directories to exclude (directories should end with "/")
• 将目标分支设置为 \ Set the target branch to：copilot/create-dfs2-documentation
• 设置PR number为 \ Set the PR number to：10866

3. 等待工作流完成 | Wait for the workflow to complete
   格式化后的代码将自动推送至你的分支。
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完成后，提交将自动更新至 copilot/create-dfs2-documentation 分支，关联的 Pull Request 也会同步更新。
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如有问题欢迎联系我们，再次感谢您的贡献！💐
If you have any questions, feel free to reach out. Thanks again for your contribution!

[github-actions]

📌 Code Review Assignment

🏷️ Tag: documentation

Reviewers: @CXSforHPU @GorrayLi @lianux-mm @unicornx

Changed Files (Click to expand)

• documentation/6.components/filesystem/dfsv2_zh.md

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📊 Current Review Status (Last Updated: 2025-10-29 19:03 CST)

• ⌛ @CXSforHPU Pending Review
• ⌛ @GorrayLi Pending Review
• ⌛ @lianux-mm Pending Review
• ⌛ @unicornx Pending Review

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