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JFFS2 on NAND flash uses a page buffer. It is flushed to the flash when it is full, or when you do fsync, sync or umount. Well obviously a node was partly written to flash and the end of the node remained in the cache and was never written. This means you lost some data。 It is a warning only. The remainder of the file system will probably still work. Only the last operation s) before reboot are lost. If I umount / before rebooting, I don't have one more error message at the next reboot. This is correct procedure if you don't want to lose any data. 如果不想出现这个警告，可以采用fsync、sync或者umount操作将不满足页缓冲的数据强制写入文件系统。
