From: Mark Lord <lkml@rtr.ca>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: linux-btrfs@vger.kernel.org, Chris Mason <chris.mason@oracle.com>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Why does stat() return invalid st_dev field for btrfs ??
Date: Mon, 17 Aug 2009 22:01:26 -0400 [thread overview]
Message-ID: <4A8A0B76.1030800@rtr.ca> (raw)
In-Reply-To: <ac3eb2510908171729k2e53914fu6ffe49483310aeba@mail.gmail.com>
Kay Sievers wrote:
> On Mon, Aug 17, 2009 at 22:47, Mark Lord<lkml@rtr.ca> wrote:
>> Chris / list,
>>
>> stat(2) seems to return invalid major/minor device info
>> for btrfs filesystems.
>>
>> Why? Is this a bug?
>
> This is not invalid and not a bug. It's a superblock without a device,
> and expected behavior.
>
> There is no one-to-one relation from a btrfs mountpoint to a device,
> it's a tree, and therefore therefore there can not be a single
> major/minor.
..
Sure there is for the most common case.
When there is only a single device, stat() should return that device.
When there are several, it should do something different.
But really, it should be using DM/LVM when there are multiple devices.
next prev parent reply other threads:[~2009-08-18 2:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-17 20:47 Why does stat() return invalid st_dev field for btrfs ?? Mark Lord
2009-08-17 21:15 ` Mark Lord
2009-08-17 21:52 ` Chris Ball
2009-08-17 21:59 ` Mark Lord
2009-08-17 22:03 ` Mark Lord
2009-08-18 0:29 ` Kay Sievers
2009-08-18 2:01 ` Mark Lord [this message]
2009-08-18 2:40 ` Chris Samuel
2009-08-18 21:21 ` Jens Axboe
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