Re: [PATCH 0/3] btrfs-progs: remove full /dev scanning

[Eric Sandeen <sandeen@redhat.com>]

On 8/21/14, 3:44 AM, Anand Jain wrote:
> 
> 
>  A long time back there was an attempt to remove it but
>  this avoided it. Pls ref to the link in this discussion.
> 
>  https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg27272.html

Hm, I guess I don't understand this.  How is udev related to whether
or not /proc/partitions is sufficient vs. recursive /dev?

To be clear, my patchset keeps the -d / --all-devices option.

It simply discovers all devices via /proc/partitions, not via
a full /dev tree walk.

Thanks,
-Eric


> Thanks, Anand
> 
> On 08/21/2014 06:21 AM, Eric Sandeen wrote:
>> btrfs fileystem show and btrfs device scan today both have
>> the "-d" option to scan everything under /dev.  But we also
>> have a mechanism to scan everything in /proc/partitions, which
>> should always be sufficient.
>>
>> If anyone knows why we'd find something deep under /dev but
>> not in /proc/partitions, speak now or forever hold your peace...
>>
>> Tested this by running through a matrix of -d, -m, or "" args
>> for show/scan, for a 2-device fs, with and without a symlinked
>> device, with and without a symlinked mountpoint.  All output was
>> identical.
>>
>> Thanks,
>> -Eric
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