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If ubifs_garbage_collect_leb() returns -EAGAIN and ubifs_return_leb returns error, a LEB will always has a "taken" flag. In this case, set the ubifs to read-only to prevent a worse situation. Signed-off-by: Baokun Li <libaokun1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>