JBD

JBD takes another, and in some ways better, approach.

JBD使用另外一种（从某种意义来说是更好的）方法。

In ext3, the journaling code uses a special API called the Journaling Block Device layer, or JBD.

在ext3里，日志记录代码使用一个特殊的称为“日志记录块设备”层或JBD的API。

In this mode ( called "data= journal" mode), the JBD journals all changes to the filesystem, whether they are made to data or metadata.

在这种方式下（称之为“data=journal”方式），JBD将所有对数据和元数据的更改都记录到文件系统中。

Objective: To observe the clinical effect of Jiangya Baoshen Decoction ( JBD) in treating early kidney lesion in aged patients with hypertension.

目的：观察降压保肾康治疗老年高血压病早期肾损害的临床疗效。

Because both data and metadata are journaled, JBD can use the journal to bring both metadata and data back to a consistent state.

因为数据和元数据都被记录，JBD可以使用日志将元数据和数据恢复到一致状态。

Rather than recording spans of bytes that must be changed, JBD stores the complete modified filesystem blocks themselves.

JBD存储完整的被修改的文件系统块本身，而不是记录必定会被更改的字节范围。

It's quite a nice arrangement, and because the JBD is being developed as a separate, generic entity, it could be used to add journaling capabilities to other filesystems in the future.

这是很好的安排，因为JBD是作为一个单独的、一般实体而开发的，将来它可以用于向其它文件系统添加日志记录能力。