udf uid/gid problem.

From: Lukasz Stelmach (stlman_at_poczta.fm)
Date: 09/29/05

  • Next message: Gerrit Huizenga: "Re: I request inclusion of SAS Transport Layer and AIC-94xx into the kernel" 
    Date:	Thu, 29 Sep 2005 20:04:38 +0200
To: LKML <linux-kernel@vger.kernel.org>

    Greetings.

    A while ago someone, please forgive me I don't remeber exactly who,
    stated here that UDF is much better than FAT for flash-drives. So I
    try to use it this way. Unfortunately there seem to be a bug in kernel
    rendering UDF on portable media completrly useless.

    A filesystem for portable media should be "userless" because one most
    probably has different uids on different machines. The first problem is
    that I am unable to use uid=/gid= options if UDF volume's root directory
    (super-block???) has an owner of uid differnet than -1. In any other
    case the on-volume owner/group takes precedence over uid=/gid= options.

    The second bug lives somewhere in writing functions. If I set the root
    (sb???) owner to -1, the uid= and gid= work until I write a single file
    onto the volume. Next time I mount the volume, with uid=/gid= of course,
    everything on it is owned by root:root.

    No.3 If I create a volum with root directory (sb???) owned root:root,
    without hacking mkudffs, and I chown(1) some files, file ownership
    information also doesn't survive unmounting.

    From what I know UDF could really be a superb filesystem for flash
    memory devices but today it is unfortunately completly useless. I might
    even forget about the ownership information, as I said it's useless or
    even harmfull on portables but setting the "root" of the volum is crucial.

    Best regards.
    PS. Please remember to CC, I'am not a subscriber. 

    -- 
Było mi bardzo miło.                    Trzecia pospolita klęska, [...]
>Łukasz<                      Już nie katolicka lecz złodziejska.  (c)PP

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  • Next message: Gerrit Huizenga: "Re: I request inclusion of SAS Transport Layer and AIC-94xx into the kernel"