I converted this partition to run ext3 with the mount options
"nodev,ro,data=writeback,defaults" figuring that when I need to install new
packages etc, that I could just mount rw as before and that metadata-only
journalling would be ok for this partition as it really sees very little write
When I try to remount it r/w I get a log message saying:
Jul 27 09:54:29 henry kernel: EXT3-fs: cannot change data mode on remount
...even if I give the full mount option list with the remount instruction.
I can, however, remount it as ext2 read-write, but when I try to remount as
ext3 (even read only) I get the same problem.
Wierdly, "mount" lists it as being still an ext3 partition even though it has
been remounted as ext2. I can't umount /usr because kjournald is currently
listed as using the partition.
The box in question is more-or-less RedHat 7.1, with ext3-2.4-0.9.4, kernel
2.4.7 and with the following relevant package versions:
...all from rawhide rpms.
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