Question regarding VFS programming

From: James D Strandboge (jstrand1@rochester.rr.com)
Date: Thu Mar 07 2002 - 16:16:48 EST

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I am playing around in the VFS code (fs/namei.c), and was wondering what
is the most efficient way of finding a child subdir if I already have
the mountpoint? Currently I am doing somethine like:

<... from_nd initialization ...>

        to = kmalloc(PATH_MAX,GFP_KERNEL);
        if (to == NULL)
                goto rel_fnd;
        to[0] = '\0';

        /* build the to pathname */
        strcat (to, from_nd.dentry->d_sb->s_root->d_name.name);
        strcat (to, "/dir_to_find/");

        /* check if the directory exists */
        if (path_init(to, LOOKUP_POSITIVE, &to_nd))
                error = path_walk(to, &to_nd);
        if(!error)
                ...

This seems totally inefficient to me, but I can't seem to find a better
method. I do not want to go into the fs code (eg ext2, etc) for a
faster way-- I need to stay up high in VFS.

Thanks!

Jamie Strandboge

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