Why does stat() return invalid st_dev field for btrfs ??

[Mark Lord]

Chris / list,

stat(2) seems to return invalid major/minor device info
for btrfs filesystems.

Why?  Is this a bug?

Eg.

        [~] uname -r
        2.6.31-rc6
        [~] mkfs.btrfs /dev/sdb
        
        WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
        WARNING! - see http://btrfs.wiki.kernel.org before using
        
        fs created label (null) on /dev/sdb
                nodesize 4096 leafsize 4096 sectorsize 4096 size 30.06GB
        Btrfs Btrfs v0.19
        [~] mount /dev/sdb /x -t btrfs
        [~] stat --format="%04D" /x
        0017
        [~] touch /x/junk
        [~] stat --format="%04D" /x/junk
        0017

This gives major=0x00, minor=0x17 for /dev/sdb,
which should have major=8, minor=0x10.

???
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