From b3ae244e7174d981c09ad7a6a68e7909d600aaca Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Thu, 13 Sep 2012 16:04:34 -0600
Subject: [PATCH] btrfs: return EPERM upon rmdir on a subvolume

A subvolume cannot be deleted via rmdir, but the error code ENOTEMPTY
is confusing. Return EPERM instead, as this is not permitted.

Signed-off-by: David Sterba <dsterba@suse.cz>
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