--- Josef Sipek <jsipek@xxxxxxxxxxxxxxxxx> wrote: > On Thu, Aug 03, 2006 at 11:09:10PM -0700, UZAIR > LAKHANI wrote: > ... > > (1) Finding out the meanings of FIST_FILTER_SCA > and > > The stackable filesystem changes the size of the > data: for example, gzipfs > takes n bytes and compresses them to m bytes. > > > FIST_FILTER_DATA > > Data gets transformed, but the size is the same: for > example, rot13fs takes > n bytes and runs them though rot13, the result is > still n bytes. > > > (3) When I update some file in the actual fs e.g. > a > > file in the folder on ext3 file system, the > changes > > done there are not reflected on the same file on > > wrapper fs but the vice versa is working > correctly. > > That is an artifact of how the Linux VFS works. When > you modify a file > though wrapfs (or any other stackable file system) > the wrapfs code gets > called. It then calls the lower file system code on > your behalf. When you > modify the lower file directly, ext3 gets the > called, but since Linux has no > way for this change to be announced up the stack, > wrapfs happily uses the > old, cached data. If you have ideas about how to > solve this, please share > them - right now, there is a lot of work being done > to get Unionfs (ours) > and eCryptfs into the vanilla linux kernel. > Hello All, Thanks for the reply. Can you please tell me where VFS caches the data, I have an idea about the dentry and inode cache but how VFS caches the actual data. Can you please give some details. Thanks, Uzair Lakhani, Karachi, Pakistan. > Jeff. > > -- > Linux, n.: > Generous programmers from around the world all > join forces to help you > shoot yourself in the foot for free. > - > To unsubscribe from this list: send the line > "unsubscribe linux-fsdevel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at > http://vger.kernel.org/majordomo-info.html > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
