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    SubjectRe: [Ext2-devel] [PATCH 2/2] ext2/3: Support 2^32-1blocks(e2fsprogs)
    On Sat, Mar 18, 2006 at 03:11:02AM -0700, Andreas Dilger wrote:
    > > As I said in my previous mail, You should specify -F option to
    > > create ext2/3 which has more than 2**31-1 blocks.
    > > It is because of the compatibility.
    > Oh, using -F for this is highly dangerous. That would allow mke2fs to
    > run on e.g. a mounted filesystem or something. Instead use an option
    > like "-E 16tb" or something.

    Agreed that we shouldn't use -F, but what's the compatibility reason?
    Supporting 2**31-1 blocks required bugfixes in the kernel and in
    e2fsprogs, yes, but if it's not a filesystem format change, but rather
    a "kernel had bugs which have now been fixed" statement, that's not
    the sort of thing where I'd think forcing the system administrator to
    add a magic command-line flag would be necessary or desirable.

    I could see printing a warning message saying that older kernels might
    have problems with this, and I could also imagine including with the
    kernel patch enabling some sort of flag that could be queried, perhaps
    via /sys/fs/ext3/32bit-nr-blocks so that if it isn't present, mke2fs
    could give a more emphatic warning that the current kernel wouldn't be
    able to deal with filesystems being created.

    - Ted
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