On Wed, Aug 8, 2012 at 12:46 PM, Rohan Puri <rohan.puri15@xxxxxxxxx> wrote:
On Tue, Aug 7, 2012 at 8:11 PM, Rishi Agrawal <rishi.b.agrawal@xxxxxxxxx> wrote:
Hi All,
I had a module which used the path_lookup function to print the details of any file's inode. I now want to rewrite that module in order to show some juniors how to write some code in kernel.
I am using 3.4.6 kernel, I tried finding out path_lookup but google showed that it has been removed.
I tried the following code then which did not work
.
.
.
dentry = kern_path_create(AT_FDCWD, filename, &path, 1);
if (IS_ERR(dentry)) {
printk("Failed to obtain the dentry");
return;
}
its not returning dentry
I again tried after seeing the implementation of vfs_stat function
user_path_at(AT_FDCWD, filename, lookup_flags, &path);
but this also fails.
I am using a proc interface to pass the filename, and copying the filename into a kernel buffer.
How can I get a copy of vfs inode for a file name.
Need to use vfs_path_lookup for this, present in fs/namei.c file, which would give you filled nameidata nd that contais inodes pointer.--
Regards,
Rishi Agrawal
_______________________________________________
Kernelnewbies mailing list
Kernelnewbies@xxxxxxxxxxxxxxxxx
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
- Rohan
vfs_path_lookup needs a dentry/mountpoint for the current path.
How will I get those.
/**
* vfs_path_lookup - lookup a file path relative to a dentry-vfsmount pair
* @dentry: pointer to dentry of the base directory
* @mnt: pointer to vfs mount of the base directory
* @name: pointer to file name
* @flags: lookup flags
* @path: pointer to struct path to fill
*/
--
Regards,
Rishi Agrawal
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
