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

[Goffredo Baroncelli <kreijack@libero.it>]

On 08/21/2014 12:21 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...

In the past I worked on this. From my commit messages [1]

[...]
the devices "scanned" are extracted from /proc/partitions. This
should avoid to scan devices not suitable for a btrfs filesystem like cdrom
and floppy or to scan not existant devices.
[...]

Of course I (we) don't care cdrom and/or floppy, but this raises 
the question: are there other block devices which aren't showed in 
proc/partitions ? 
I am thinking to some less common hardware like
NON USB sd disk (I saw this kind of hardware, but now I don't have 
it in my hands....).

GB

[1] 0dbd99fb3e117cd5f87eda492b6b4fab1b5bea23
> 
> 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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