Journaled file system: Many file systems provide journaling to prevent loss of data.
日志文件系统：许多文件系统都提供日志以防止数据丢失。
Like ext3, ext4 is a journaling file system.
和ext3一样，ext4也是一个日志文件系统。
The fourth extended journaling file system (ext4fs) is the evolution of ext3fs.
第四扩展日志文件系统（fourth extended journaling file system，ext4fs）是由 ext3fs 演化而来。
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