How to get the inode - no path_lookup

[Rishi Agrawal]

On Wed, Aug 8, 2012 at 12:46 PM, Rohan Puri <rohan.puri15 at gmail.com> wrote:

>
>
> On Tue, Aug 7, 2012 at 8:11 PM, Rishi Agrawal <rishi.b.agrawal at 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 at 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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