On Wed, Aug 8, 2012 at 12:46 PM, Rohan Puri <rohan.puri15@gmail.com> wrote:
On Tue, Aug 7, 2012 at 8:11 PM, Rishi Agrawal <rishi.b.agrawal@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
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- 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