officially fixed in vanilla 2.6.27.3:
commit c068663ae65e507814545b59a8e2090f48a85613
Author: Christoph Hellwig <[EMAIL PROTECTED]>
Date:   Sun Oct 12 14:30:44 2008 +0200

    xfs: fix remount rw with unrecognized options
    
    commit 6c5e51dae2c37127e00be392f40842e08077e96a upstream
    
    When we skip unrecognized options in xfs_fs_remount we should just break
    out of the switch and not return because otherwise we may skip clearing
    the xfs-internal read-only flag.  This will only show up on some
    operations like touch because most read-only checks are done by the VFS
    which thinks this filesystem is r/w.  Eventually we should replace the
    XFS read-only flag with a helper that always checks the VFS flag to make
    sure they can never get out of sync.
    
    Bug reported and fix verified by Marcel Beister on #xfs.
    Bug fix verified by updated xfstests/189.
    
    Signed-off-by: Christoph Hellwig <[EMAIL PROTECTED]>
    Acked-by: Eric Sandeen <[EMAIL PROTECTED]>
    Signed-off-by: Timothy Shimmin <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
    Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>

-- 
8.10 intrepid alpha 6 - root file system mounted read only (XFS) 
with2.6.27-4-generic 
https://bugs.launchpad.net/bugs/273601
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