Re: mdconfig recently broken?

From: Christian S.J. Peron (csjp_at_FreeBSD.org)
Date: 08/29/05

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    Date: Mon, 29 Aug 2005 21:41:31 +0000
To: saturnero@freesbie.org

    >Hi everybody,
    >due to limited connectivity in August, I've been able to
    >update my -CURRENT box only yesterday since the first days of August
    >(iirc).
    >
    >I noticed that mdconfig -a -t vnode -f ${myfile} isn't working anymore
    >when ${myfile} is on a read-only filesystem:
    >
    >sberta:/usr/local/freesbie-clone/uzip# mdconfig -a -t vnode -f usr.uzip
    >md0
    >sberta:/usr/local/freesbie-clone/uzip# mdconfig -d -u 0
    >sberta:/usr/local/freesbie-clone/uzip# mount -fru /usr
    >sberta:/usr/local/freesbie-clone/uzip# mdconfig -a -t vnode -f usr.uzip
    >mdconfig: ioctl(/dev/mdctl): Read-only file system
    >
    >This makes impossible to use compressed filesystems on devices like
    >cdrom or read-only diskless environment. Any idea? I'm using:
    >
    >FreeBSD sberta.saturnero.sat 7.0-CURRENT FreeBSD 7.0-CURRENT #2: Sat Aug 27 18:1
    >5:39 CEST 2005 satu at sberta.saturnero.sat:/usr/obj/usr/src/sys/SBERTA i386
    >sberta:/usr/local/freesbie-clone/uzip#
    >
    >Bye and thanks in advance,
    >Dario
    >

    Come to think about it, -o readonly isnt going to help. the bottom line is,
    if the backing store is readonly, it should never be possible to write to it. 

    -- 
Christian S.J. Peron
csjp@FreeBSD.ORG
FreeBSD Committer
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