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Sab\u00edamos que esto omite el bloqueo adecuado (sb->s_umount) y no pasa por el procedimiento de remontaje del sistema de archivos adecuado, pero ha sido la forma en que funcion\u00f3 desde los primeros d\u00edas de ext2 y fue lo suficientemente bueno para la mitigaci\u00f3n de da\u00f1os en situaciones catastr\u00f3ficas. Recientemente, syzbot encontr\u00f3 una forma (ver enlace) de activar advertencias en el congelamiento del sistema de archivos porque el c\u00f3digo se confundi\u00f3 con SB_RDONLY cambiando bajo sus manos. Desde estos d\u00edas establecemos EXT4_FLAGS_SHUTDOWN en el superbloque, lo cual es suficiente para detener todas las modificaciones del sistema de archivos, no deber\u00eda ser necesario modificar SB_RDONLY. 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