No. When a file system is mounted R/O, the expectation is that _no_
write access occurs on it (like with a hardware R/O device). After you
have remounted it R/O, a subsequent umount may not write to the
device. Thus you can't mark it clean afterwards. (I don't know if
anything depends on this behavior, but I think this is a common
assumption which should not be broken.)
Plus, this is not nice UI-wise: nobody expects the system to fsck
after a shutdown which looks completely OK. (People who don't know
from experience how robust ext2fs really is might go into panic :-)
olaf
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