Re: File change notification along with user
On Wed, Oct 12, 2011 at 11:30 AM, Abhijit Pawar apawar.li...@gmail.comwrote: On 10/12/2011 10:50 AM, V.Ravikumar wrote: Other than fanotify , I can achieve my requirement through a driver/module. If this can be achieved through a driver/module please provide me inputs to start. Thanks, Ravi On Wed, Sep 21, 2011 at 10:27 AM, rohan puri rohan.pur...@gmail.comwrote: On Wed, Sep 21, 2011 at 10:03 AM, V.Ravikumar ravikumar.valla...@gmail.com wrote: Hi all, Is it possible to write a module/driver which notifies file/directory change asynchronously along with user name(or with uid) who modified it. inotify will do change notification but it will not provide uid who modified/created the file. audit and inotify combination can work, but I'm looking for a better option than this. Please help me. Thanks, Ravi ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies You can have a look at fanotify. Refer http://lwn.net/Articles/339253/ Regards, Rohan Puri ___ Kernelnewbies mailing listKernelnewbies@kernelnewbies.orghttp://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies Hi Ravi, As mentioned in the article, you can start looking at fsnotify code in the kernel. What we need is like something inserted between the VFS Layer and the filesystem driver which will tell you what is going on. Regards, Abhijit Pawar Thank you Abhijit for your response. Previously I had gone through the inotify code (ie fsnotify). What I've observed is, there are inotify patches *(with fsnotify_ prefix )* in every file I/O system calls implementation. So what I understood is we can not achieve file change notification without patching the existing kernel source code. ie I can not achieve this using a simple device driver kind of mechanism. Please correct me if I'm wrong. Regards, Ravi ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: File change notification along with user
On Wed, Oct 12, 2011 at 12:17 PM, V.Ravikumar ravikumar.valla...@gmail.comwrote: On Wed, Oct 12, 2011 at 12:04 PM, rohan puri rohan.pur...@gmail.comwrote: On Wed, Oct 12, 2011 at 10:50 AM, V.Ravikumar ravikumar.valla...@gmail.com wrote: Other than fanotify , I can achieve my requirement through a driver/module. If this can be achieved through a driver/module please provide me inputs to start. Thanks, Ravi On Wed, Sep 21, 2011 at 10:27 AM, rohan puri rohan.pur...@gmail.comwrote: On Wed, Sep 21, 2011 at 10:03 AM, V.Ravikumar ravikumar.valla...@gmail.com wrote: Hi all, Is it possible to write a module/driver which notifies file/directory change asynchronously along with user name(or with uid) who modified it. inotify will do change notification but it will not provide uid who modified/created the file. audit and inotify combination can work, but I'm looking for a better option than this. Please help me. Thanks, Ravi ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies You can have a look at fanotify. Refer http://lwn.net/Articles/339253/ Regards, Rohan Puri Hi Ravi, See, first of all if you want to notify file/dir change you need to the control after the invocation of that i_ops or f_ops. So there are two ways in which you can do : - 1. Easy recommended : - Write a stackable file system module. The aim of this module will be to intercept vfs-calls on files/dirs then call the underlying file systems specific operations. Now after completion of this operation, you would generate the change event here which will be used to notify. Note : - stackable file system research work was done by Professor *Erez Zadok. * refer ecryptfs for an example. This is more helpful for me. 2. Complex not recommended : - Instead of writing a stackable file system, you hook the mount sys call to get the control of the fs related structs. Then replace the original i_ops and f_ops pointer with your own defined ops. save the originals somewhere. Then when from user-space when some change operation is called, internally your ops will be called and now you call the original stored one and contruct the notification events Even I've this in my mind. As it is not recommended,I had dropped this choice 3. See if the module making use of LSM infrastructure will be able to do this or not. Regards, Rohan Puri Hi Rohan Thank you for your valuable inputs. I will through the ecryptfs Thanks Ravi Hi Ravi, Good :). One more thing about that first approach, that stackable file system has to be mounted on the top-level directory, for which (sub-dirs and files) you need the notifications. This acts as the stacking trigger point. Was just keen to know, where are you requiring it? Regards, Rohan Puri ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: File change notification along with user
Other than fanotify , I can achieve my requirement through a driver/module. If this can be achieved through a driver/module please provide me inputs to start. Thanks, Ravi On Wed, Sep 21, 2011 at 10:27 AM, rohan puri rohan.pur...@gmail.com wrote: On Wed, Sep 21, 2011 at 10:03 AM, V.Ravikumar ravikumar.valla...@gmail.com wrote: Hi all, Is it possible to write a module/driver which notifies file/directory change asynchronously along with user name(or with uid) who modified it. inotify will do change notification but it will not provide uid who modified/created the file. audit and inotify combination can work, but I'm looking for a better option than this. Please help me. Thanks, Ravi ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies You can have a look at fanotify. Refer http://lwn.net/Articles/339253/ Regards, Rohan Puri ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
File change notification along with user
Hi all, Is it possible to write a module/driver which notifies file/directory change asynchronously along with user name(or with uid) who modified it. inotify will do change notification but it will not provide uid who modified/created the file. audit and inotify combination can work, but I'm looking for a better option than this. Please help me. Thanks, Ravi ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: File change notification along with user
On Wed, Sep 21, 2011 at 10:03 AM, V.Ravikumar ravikumar.valla...@gmail.comwrote: Hi all, Is it possible to write a module/driver which notifies file/directory change asynchronously along with user name(or with uid) who modified it. inotify will do change notification but it will not provide uid who modified/created the file. audit and inotify combination can work, but I'm looking for a better option than this. Please help me. Thanks, Ravi ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies You can have a look at fanotify. Refer http://lwn.net/Articles/339253/ Regards, Rohan Puri ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
