[Bug 812] New: sb_bad_features2 not fixed when a filesystem is first mounted read-only

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http://oss.sgi.com/bugzilla/show_bug.cgi?id=812

           Summary: sb_bad_features2 not fixed when a filesystem is first
                    mounted read-only
           Product: Linux XFS
           Version: Current
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: XFS kernel code
        AssignedTo: xfs-masters@xxxxxxxxxxx
        ReportedBy: hch@xxxxxxx


When we mount a filesystem read-only all the superblock updates are skipped,
mostly the alignment values and the bad_features2 correction.  For the case of a
root filesystem that's always mounted read-only that means they will never be
fixed on disk.  Current kernels are smart enough to work just fine with that
except for printining noisy messages, but when going back to old kernels with
the wrong x86/x86_64 combination it could blow up.

Reported by Arkadiusz Miskiewicz <arekm@xxxxxxxx>.

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