On Thu, Feb 18, 2010 at 01:15:34AM -0500, Pavel Roskin wrote:
> On Wed, 2010-02-17 at 23:23 -0500, Pavel Roskin wrote:
>
> > The idea is to descend the directory structure from the top (i.e. the
> > directory to be removed) to look for a child that is a file or an empty
> > directory and remove it. Then start from the top and do the same until
> > the top directory has no children. Then remove the top directory.
>
> Here it is. I tested it by actually replacing the original function in
> wireless-testing. I checked unloading all wireless drivers. I also
> tested error handling by keeping a file in debugfs open while removing
> the modules.
>
> I could compile it against Linux 2.6.26, so it's portable enough for our
> purposes.
>
>
> void debugfs_remove_recursive(struct dentry *dentry)
> {
> struct dentry *last = NULL;
>
> /* Sanity checks */
> if (!dentry || !dentry->d_parent || !dentry->d_parent->d_inode)
> return;
>
> while (dentry != last) {
> struct dentry *child = dentry;
>
> /* Find a child without children */
> while (!list_empty(&child->d_subdirs))
> child = list_entry(child->d_subdirs.next, struct dentry,
> d_u.d_child);
>
> /* Bail out if we already tried to remove that entry */
> if (child == last)
> return;
>
> last = child;
> debugfs_remove(child);
> }
> }
Sweeet, thanks a lot! I've sucked this into all the respective git trees. This
means we now have backporting re-enabled on bleeding edge for kernels older
than 2.6.27 (whoopdi-free'kin-doo for those who are on those ancient kernels).
Luis
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