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    SubjectRe: [Ext2-devel] [PATCH 1/2] ext2/3: Support 2^32-1 blocks(Kernel)
    On Mar 25, 2006  11:51 -0300, wrote:
    > As AMS has pointed out, the filesystem creator must be set to Hurd for
    > these inode fields to be used. Since ext2 seems to be the most
    > supported filesystem on Hurd, most of the ext2 fs used have the fs
    > creator set to Hurd.

    So, if fs creator is Linux then HURD doesn't try to use those fields?
    That would allow Linux to start using them, and if such a filesystem
    is used on HURD then it could store the translator/author/mode_high
    in the xattr space. Does it even make sense to add translator/author
    to existing files, or only at file creation time?

    That would mean that Linux would just need to check the fs creator
    field before using any of the HURD-reserved fields.

    > Regarding compatibility, there are plans to support xattr in Hurd and
    > use them for these fields, translator and author. (I can't recall what
    > i_mode_high is used for.) With respect to that, I'd appreciate if
    > there is a recommendation to every ext2 implementation (not only
    > Linux) that supports xattr, to support gnu.translator and
    > (I'll check about the i_mode_high and post about it asap.).

    Not that we will be in a rush to use these fields, but it would be good
    to know what i_mode_high is used for in case it ever becomes relevant
    for Linux we would want to keep it the same meaning as HURD.

    > There is a
    > patch by Roland McGrath for Linux that supports those besides the
    > reserved fields in case the fs creator is Hurd.

    I'm not sure what is required for supporting such EAs? I don't think
    any kernel would remove existing EAs, even if it doesn't understand

    Cheers, Andreas
    Andreas Dilger
    Principal Software Engineer
    Cluster File Systems, Inc.

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