Hello Rohan , Thanks a lot for help. :) On 12/29/11, rohan puri <rohan.puri15@xxxxxxxxx> wrote: > On Thu, Dec 29, 2011 at 6:02 PM, Gaurav Saxena > <grvsaxena419@xxxxxxxxx>wrote: > >> On 12/29/11, Rajat Sharma <fs.rajat@xxxxxxxxx> wrote: >> > well ecryptfs which ships with mainline linux kernel is based upon >> > stackable approach (wrapfs), do you call it hack? :) >> Ok. I will try to use wrapfs but it seems its quite old and inactive >> too. I would have to write a new filesystem extending wrapfs it seems. >> I would work upon it and ask for help when I get problems. :) >> Thanks a lot for helping me. >> > >> > On Thu, Dec 29, 2011 at 5:36 PM, Gaurav Saxena <grvsaxena419@xxxxxxxxx> >> > wrote: >> >> On 12/29/11, Rajat Sharma <fs.rajat@xxxxxxxxx> wrote: >> >>> Well kprobe is: >> >>> >> >>> 1. meant to instrument debugging while developing >> >>> 2. Is configured with kernel configuration parameters which you can >> >>> not guarantee to be configured on deployment site. >> >>> 3. slower as it works with debugger break point instruction and single >> >>> stepping mode. >> >>> 4. probing into an instruction and altering behavior might not scale >> >>> across kernel version and interface changes. >> >>> >> >>> But yes, you can technically capture any kernel instruction's virtual >> >>> address and probe into it. Building solution on top of such >> >>> instrumentation -- HACK!! :) >> >> Ok Thanks. I see it will be real slow then as its only a debugging >> >> mechanism, I also found a hack which uses a kprobe based approach and >> >> adds a jump code to beginning of system calls. Yes I agree with you , >> >> I don't want hack which needs to be changed with kernel versions or >> >> depends on configuration of kernel. >> >> I will give a try to wrapfs today. :) Is it too a hack ? >> >>> >> >>> Did you try looking for LSM as well? >> >> LSM projects like SELinux ? Actually they need kernel rebuild/ >> >> reinstall thus I would try not to go for such options. >> >>> >> >>> -Rajat >> >>> >> >> >> >> -- >> >> Thanks and Regards , >> >> Gaurav >> > >> >> >> -- >> Thanks and Regards , >> Gaurav >> -- >> 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 >> > > Just to let you know, you can make use of > http://gauravnaigaonkar.web.officelive.com/Documents/hw2.txt as a reference > on how to write a stackable file system. This is for linux kernel version > 2.6.26 > > Regards, > Rohan Puri > -- Thanks and Regards , Gaurav -- 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
