Behaviour of mount_unionfs

From: Dario Freni (saturnero_at_freesbie.org)
Date: 05/23/05

  • Next message: Kirk McKusick: "Re: snapshots and innds" 
    Date: Mon, 23 May 2005 05:25:17 +0200
To: freesbie@gufi.org

    cupa:/mnt/freesbie# ll
    total 4
    drwxr-xr-x 2 root wheel 512 23 Mag 05:13 unionvar
    drwxr-xr-x 2 root wheel 512 23 Mag 05:13 var
    cupa:/mnt/freesbie# mdconfig -a -t vnode -f /usr/local/freesbieiso/uzip/var.uzip
    md2
    cupa:/mnt/freesbie# mount /dev/md2.uzips1a var
    cupa:/mnt/freesbie# ls -l var/
    total 40
    drwxrwxr-x 2 root operator 512 23 Mag 04:54 .snap
    drwxr-xr-x 2 root wheel 512 23 Mag 04:33 account
    drwxr-xr-x 4 root wheel 512 23 Mag 04:33 at
    drwxr-x--- 2 root wheel 512 23 Mag 04:33 backups
    drwxr-x--- 2 root wheel 512 23 Mag 04:33 crash
    drwxr-x--- 3 root wheel 512 23 Mag 04:33 cron
    drwxr-xr-x 6 root wheel 512 23 Mag 04:33 db
    dr-xr-xr-x 2 root wheel 512 23 Mag 04:33 empty
    drwxrwxr-x 2 root games 512 23 Mag 04:33 games
    drwx------ 2 root wheel 512 23 Mag 04:33 heimdal
    drwxr-xr-x 2 root wheel 512 23 Mag 04:33 log
    drwxrwxr-x 2 root mail 512 23 Mag 04:33 mail
    drwxr-xr-x 2 daemon wheel 512 23 Mag 04:33 msgs
    drwxr-xr-x 5 root wheel 512 23 Mag 04:33 named
    drwxr-xr-x 2 root wheel 512 23 Mag 04:33 preserve
    drwxr-xr-x 4 root wheel 512 23 Mag 04:48 run
    drwxrwxr-x 2 root daemon 512 23 Mag 04:33 rwho
    drwxr-xr-x 8 root wheel 512 23 Mag 04:33 spool
    drwxrwxrwt 3 root wheel 512 23 Mag 04:48 tmp
    drwxr-xr-x 2 root wheel 512 23 Mag 04:35 yp
    cupa:/mnt/freesbie# mdconfig -a -t malloc -o compress -s 16m
    md3
    cupa:/mnt/freesbie# /sbin/newfs -U /dev/md3
    /dev/md3: 16.0MB (32768 sectors) block size 16384, fragment size 2048
            using 4 cylinder groups of 4.02MB, 257 blks, 576 inodes.
            with soft updates
    super-block backups (for fsck -b #) at:
     160, 8384, 16608, 24832
    cupa:/mnt/freesbie# mount /dev/md3 unionvar/
    cupa:/mnt/freesbie# mount_unionfs unionvar/ var/
    cupa:/mnt/freesbie# ls -l var/
    total 40
    drwxrwxr-x 4 root operator 512 23 Mag 05:14 .snap
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 account
    drwxr-xr-x 6 root wheel 512 23 Mag 05:15 at
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 backups
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 crash
    drwxr-xr-x 5 root wheel 512 23 Mag 05:15 cron
    drwxr-xr-x 8 root wheel 512 23 Mag 05:15 db
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 empty
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 games
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 heimdal
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 log
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 mail
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 msgs
    drwxr-xr-x 7 root wheel 512 23 Mag 05:15 named
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 preserve
    drwxr-xr-x 6 root wheel 512 23 Mag 05:15 run
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 rwho
    drwxr-xr-x 10 root wheel 512 23 Mag 05:15 spool
    drwxr-xr-x 5 root wheel 512 23 Mag 05:15 tmp
    drwxr-xr-x 4 root wheel 512 23 Mag 05:15 yp
    cupa:/mnt/freesbie#

    With unionfs we lost (again) every kind of permission. From the man
    page I cannot realize if this really is the expected behaviour.

    Bye,
    Dario 

    -- 
Dario Freni (saturnero@freesbie.org) - satu on Azzurra
FreeSBIE developer (http://www.freesbie.org)
GPG Public key at http://www.saturnero.net/saturnero.asc

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