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    SubjectMounting tmpfs with symbolic gid doesn't work
    Hi,

    Mounting tmpfs with gid=<symbolic-group> doesn't work on recent kernels
    any more; the same with uid=<symbolic-username> works fine:

    rsc@isonoe:~$ mkdir troet
    rsc@isonoe:~$ sudo mount -t tmpfs -ogid=rsc none troet/
    mount: wrong fs type, bad option, bad superblock on none,
    missing codepage or other error
    In some cases useful info is found in syslog - try
    dmesg | tail or so
    rsc@isonoe:~/svn/ptxdist-trunk$ dmesg | tail -n 1
    tmpfs: Bad value 'rsc' for mount option 'gid'
    rsc@isonoe:~$ sudo mount -t tmpfs -ogid=1006 none troet/
    rsc@isonoe:~$ mount | grep troet
    none on /home/rsc/troet type tmpfs (rw,gid=1006)
    rsc@isonoe:~$ ls -ld troet/
    drwxrwxrwt 2 root 1006 40 Jan 11 12:32 troet/
    rsc@isonoe:~$ sudo umount troet/
    rsc@isonoe:~$ sudo mount -t tmpfs -ouid=1006 none troet/
    rsc@isonoe:~$ sudo umount troet/
    rsc@isonoe:~$ sudo mount -t tmpfs -ouid=rsc none troet/
    rsc@isonoe:~$ ls -ld troet/
    drwxrwxrwt 2 rsc root 40 Jan 11 12:33 troet/
    rsc@isonoe:~$ sudo umount troet/

    Tested with 2.6.19-rc6, the behaviour seems to have worked until at
    least 2.6.16. Does anyone have an idea?

    Robert
    --
    Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
    Pengutronix - Linux Solutions for Science and Industry
    Handelsregister: Amtsgericht Hildesheim, HRA 2686
    Hannoversche Str. 2, 31134 Hildesheim, Germany
    Phone: +49-5121-206917-0 | Fax: +49-5121-206917-9

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