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    SubjectProblems with large block devices in 64 bit kernels
    Andries Brouwer wrote:

    > On Wed, Sep 06, 2006 at 10:54:42PM +0200, Christian Schmid wrote:
    >
    >> I run kernel 2.6.17.11 vanilla in 64 bit mode with 32 bit emulation.
    >> model name : Intel(R) Xeon(R) CPU 5150 @ 2.66GHz
    >>
    >> Unfortunately there is no support for file-systems bigger than 2 TB in 64-bit mode with 32-bit
    emulation.
    >>
    >> erikm in #kernelnewbies told me to report it here:
    >>
    >> <Dragony> statfs("/MD2", 0xff8deca4) = -1 EOVERFLOW (Value too large for defined
    data type)
    >
    >
    >
    > Hmm. statfs uses struct statfs which has a 4-byte f_blocks field,
    > and hence cannot hold larger values. You get what you ask for.
    >
    > statfs64 uses struct statfs64 which uses an 8-byte f_blocks field.
    >
    > (And then there is statvfs.)
    >
    > Andries


    Hmm I dont think its that easy. Actually the max. value is 16 TB because of 232*4096 (block-size)
    and this works on a 32 bit kernel.

    df on 32 bit kernel:
    (See attached image. Sorry, this kernel has not the required network-driver included. Had to take a
    screenshot)

    SAME df on 64 bit kernel:
    write(1, "Filesystem 1K-blocks "..., 67Filesystem 1K-blocks Used Available
    Use% Mounted on
    ) = 67
    statfs("/", {f_type=0x58465342, f_bsize=4096, f_blocks=732384, f_bfree=508015, f_files=2939776,
    f_ffree=2901955, f_namelen=255}) = 0
    write(1, "/dev/md0 2929536 "..., 58/dev/md0 2929536 897476 2032060
    31% /
    ) = 58
    statfs("/proc", {f_type="PROC_SUPER_MAGIC", f_bsize=4096, f_blocks=0, f_bfree=0, f_files=0,
    f_ffree=0, f_namelen=255}) = 0
    statfs("/MD1", {f_type=0x58465342, f_bsize=4096, f_blocks=4407104, f_bfree=4403156,
    f_files=17638656, f_ffree=17638645, f_namelen=255}) = 0
    write(1, "/dev/md1 17628416 "..., 61/dev/md1 17628416 15792 17612624
    1% /MD1
    ) = 61
    statfs("/MD2", 0xffa30614) = -1 EOVERFLOW (Value too large for defined data type)
    write(2, "df: ", 4df: ) = 4
    write(2, "`/MD2\'", 6`/MD2') = 6
    write(2, ": Value too large for defined da"..., 39: Value too large for defined data type) = 39
    write(2, "\n", 1
    ) = 1
    statfs("/dev/pts", {f_type=0x1cd1, f_bsize=4096, f_blocks=0, f_bfree=0, f_files=0, f_ffree=0,
    f_namelen=255}) = 0
    munmap(0xf7eea000, 4096) = 0

    So its definetly something with the kernel.

    Regards,
    Christian Schmid
    [image]
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