On Wed, Aug 8, 2012 at 12:46 PM, Rohan Puri <rohan.pur...@gmail.com> wrote:
> > > On Tue, Aug 7, 2012 at 8:11 PM, Rishi Agrawal > <rishi.b.agra...@gmail.com>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@kernelnewbies.org >> 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
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