这是因为JFS2在实现时使用了写独占(write - exclusive)索引节点锁，允许多个用户同时读取相同的文件。
This is due to the way in which JFS2 is implemented with a write-exclusive inode lock, allowing multiples users to read the same file simultaneously.
在发出独占锁定后，其他的读或写操作将不会再发生。
Once an exclusive lock has been issued, no other read or write operations can take place.
Quiesced Exclusive 0x4当调用表空间静默(quiesce)功能的应用程序独占(读或写)访问表空间时，该表空间就处于这种状态。
Quiesced exclusive 0x4 a table space is in this state when the application that invokes the table space quiesce function has exclusive (read or write) access to the table space.
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