系统关机后，嵌入式文件系统UBIFS数据丢失

Whenever I run my application on UBIFS file system and do a write operation on any file(provided file has proper read and write modes),immediately after power off and on, I see that the content written to the file is missing.The size of the file is zero.The same thing if performed on JFFS2 file system does not pose this issue.I have tried using sync command but still rarely this problem exists.Whenever I run my application on UBIFS file sys