quota: check quota reservation on remove_dquot_ref
Reserved space must being claimed before remove_dquot_ref() for a given inode. Filesystem is responsible for performing force blocks allocation in case of dealloc in ->quota_off. Let's add sanity check for that case. Do it similar to add_dquot_ref(). Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jan Kara <jack@suse.cz>
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