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ev_unset_last_byte() must be called while the fd is still valid. After a write error, dev_unset_last_byte() must be called before closing the dev and resetting the fd. In the write error path, dev_unset_last_byte() was being called after label_scan_invalidate() which meant that it would not unset the last_byte values. After a write error, dev_unset_last_byte() is now called in dev_write_bytes() before label_scan_invalidate(), instead of by the caller of dev_write_bytes(). In the common case of a successful write, the sequence is still: dev_set_last_byte(); dev_write_bytes(); dev_unset_last_byte(); Signed-off-by: Zhao Heming <heming.zhao@suse.com>