![14
reference
? [vfs-feature]
? https://github.com/benwei/bos/tree/feature-
vfs
? [xboot]
? https://github.com/jerryjianjun/xboot
? [prex]
? https://github.com/AndrewD/prex](https://image.slidesharecdn.com/20111220-vfs-140702105706-phpapp02/85/Virtual-file-system-VFS-14-320.jpg)
![[精华回顾]讲座：How To Install Linux](https://cdn.slidesharecdn.com/ss_thumbnails/howtoinstalllinux-090922040008-phpapp02-thumbnail.jpg?width=560&fit=bounds)
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Virtual file system (VFS)
- 2. 2 Outline ? Introduce VFS ? VFS implement ? Ramfs ? Vfs/ramfs to Bos
- 3. 3 virtual file system(1/2) ls mkdir mount libc VFS cpiofs procfs arfs devfs tarfs ramfs filesystem
- 4. 4 virtual file system(2/2) ? vfs framework – vnode / file / dirent struct – mount / mkdir ? no file I/O – device model – file block struct – read / write ? no lock – no Synchronized
- 5. 5 VFS implement (call trace) ? mount->sys_mount->ramfs_mount ? mkdir->sys_mkdir->ramfs_mkdir ? open_dir->sys_opendir->ramfs_opendir ? read->sys_read->ramfs_read ? write->sys_write->ramfs_write
- 7. 7 vfs 轉換 ? 轉換vnode 到個別檔案系統的節點 – namei / lookup ? 找到對應filesystem,root point ? 分解路徑 ? 轉換 /test/test1 / /test /test/test1 Filesystem 相關
- 8. 8 mount ? “/” ,根目錄比較特別,需要直接用mount建立, 其他目錄皆需用mkdir創建 ? sys_mount掛載一個檔案系統,所有操作皆會 被轉為此檔案系統各自的操作 / ramfs /test ext2
- 11. 11 ramfs(1/2) ? vnode -> ramfs_node ? ramfs 自我組織 / /test1 /test2 /test
- 13. 13 vfs/ramfs to Bos ? Porting from prex/xboot ? Github https://github.com/benwei/bos/tree/feature- vfs ? fs – vfs – ramfs ? ls command
- 14. 14 reference ? [vfs-feature] ? https://github.com/benwei/bos/tree/feature- vfs ? [xboot] ? https://github.com/jerryjianjun/xboot ? [prex] ? https://github.com/AndrewD/prex