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exFAT文件系统在 Linux 7.2 中通过 IOmap 获得更好的性能

  • 2026-06-29 06:50:41
exFAT文件系统在 Linux 7.2 中通过 IOmap 获得更好的性能

开源开发者 Namjae Jeon 除了负责维护新的 NTFS 驱动，也负责继续维护 exFAT 驱动。该文件系统也是微软开发的，在可移动存储介质很受欢迎。

Linux 7.2 针对 exFAT 文件系统的改进相当令人兴奋，其中包括完成了IOmap 转换移植。Linux 上的 exFAT 文件系统现在已经适配使用 IOmap 基础设施支持缓冲 I/O、直接 I/O，以及 LLSEEK SEEK_HOLE/SEEK_DATA 功能。IOmap 是 Linux 用于将文件逻辑偏移映射到物理存储块的框架，用以替代内核中先前的 buffer head 机制。IOmap 也用于处理文件系统其他常见操作。

将 exFAT 转换为在这些通用操作使用 IOmap 的补丁，带来了非常显著的性能提升：

该 exFAT 拉取请求已经合并到 Linux 7.2 中，同时还包含大量修复和其他代码改进。仅这一项 IOmap 转换带来的性能增强，就足以成为 exFAT 用户值得更新的内容。

对我们开发者意味着什么呢？双系统从Linux访问Windows分区更快更稳定，还有些读SD卡/移动硬盘和虚拟机的场合也用得上。
参考

https://www.phoronix.com/news/Linux-7.2-exFAT

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  1. CONNECT:[ UseTime:0.000945s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001467s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003103s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.018528s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000916s ]
  6. SELECT * FROM `set` [ RunTime:0.000265s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000646s ]
  8. SELECT * FROM `article` WHERE `id` = 501452 LIMIT 1 [ RunTime:0.017391s ]
  9. UPDATE `article` SET `lasttime` = 1783021735 WHERE `id` = 501452 [ RunTime:0.011196s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.006686s ]
  11. SELECT * FROM `article` WHERE `id` < 501452 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.018576s ]
  12. SELECT * FROM `article` WHERE `id` > 501452 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007478s ]
  13. SELECT * FROM `article` WHERE `id` < 501452 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006737s ]
  14. SELECT * FROM `article` WHERE `id` < 501452 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.047376s ]
  15. SELECT * FROM `article` WHERE `id` < 501452 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.025589s ]
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