Hi, I am currently working on implementing a simple encrypted file system using a stackable file system WrapFS <http://wrapfs.filesystems.org/>. In order to do so, as I read in the WrapFS mailing list <http://www.fsl.cs.sunysb.edu/pipermail/wrapfs/2011-November/000058.html> one needs to implement address space operations, which I have done and posted on my github at this link <https://github.com/bawejakunal/wrapfs-addresspace-operations/blob/master/mma...> and it works fine. But now when I am trying to modify the data before being written in wrapfs_lower() function I get a blank output in files written out. Please guide where am I going wrong in modifying the data to be written and what could be the best way to decrypt it ? Thanks *Kunal Baweja* Undergraduate B.E. (Hons.) Computer Science Birla Institute Of Technology & Science, Pilani K.K. Birla Goa Campus +91 9049655665