From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Lord <lkml@rtr.ca>
Subject: Why does stat() return invalid st_dev field for btrfs ??
Date: Mon, 17 Aug 2009 16:47:22 -0400
Message-ID: <4A89C1DA.6040601@rtr.ca>
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To: linux-btrfs@vger.kernel.org, Chris Mason <chris.mason@oracle.com>
Return-path: <linux-btrfs-owner@vger.kernel.org>
List-ID: <linux-btrfs.vger.kernel.org>

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.

???