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Android 4. 3 新支持的 fstrim TRIM 技术是如何优化设备性能的？ Android 4 3 中的 TRIM 是用 fstrim 实现的，但一般 Linux 发行版并不建议使用 fstrim 的方法，而是使用 mount ext4 分区时加上 discard 选项的办法。 因为 discard 选项会在每一个磁盘操作时同时执行 TRIM 指令，所以可能会影响到删除文件时的性能。
Ext4 文件系统概要 - 知乎 By default, ext4 inode records are 256 bytes, and (as of October 2013) the inode structure is 156 bytes (i_extra_isize = 28) The extra space between the end of the inode structure and the end of the inode record can be used to store extended attributes