On Fri, Jan 31, 2014 at 04:32:31PM -0500, Jeff Layton wrote:

>       done_path_create(&new_path, new_dentry);
> +     path_put(&old_path);

... and the filesystem in question isn't pinned anymore, so it can be
unmounted, except that

>       if (delegated_inode) {
>               error = break_deleg_wait(&delegated_inode);

this does an iput() on delegated_inode.  And umount really doesn't
like finding pinned inodes.  Sorry, no go.

I'm going with Oleg's patch with second path_put() added.
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