Re: [RFC PATCH] libata: sysfs naming option

[Hannes Reinecke <hare@suse.de>]

On 1/5/22 07:18, Damien Le Moal wrote:
> On 1/3/22 18:09, Hannes Reinecke wrote:
>> This patch adds a config option ATA_SYSFS_NAMING to align the libata
>> device names in sysfs with those in the kernel message log.
>> It adds a new dummy bus 'ata', which collects all ata device objects
>> like ata_port, ata_link, and ata_dev, and adds an 'ata' prefix to the
>> message log.
>> For consistency the 'ata_dev' name has been changed from 'ata' to 'dev';
>> as this induces a sysfs change the config option is disabled per default.
>>
>> Patch is relative to the 'for-5.17-logging' branch from Damien.
> 
> FYI, I queued the logging series in for-5.17, minus this patch.
> Everything is in for-next too to check that nothing is broken.
> 
> For this patch, as I commented, I think we can keep a backward
> compatible naming using sysfs symlinks. But I am not entirely sure if
> that can work with port-multiplier setups. Let's work on that for the
> next cycle ?
> 
Well, I'm not terribly happy about the current port multiplier 
implementation, either.
Currently they are named 'ataX.Y.0', making them the only ata objects 
with three levels. Personally I would take the PATA master/slave thingie 
as an example, and just increase the last number (such that we would 
have ata1.0, ata1.1, ata1.2 etc).
Reasoning here is that PMP is pretty much an SATA thing, and 'slave' 
drives is a PATA thing. So they'll never clash.

As for the 'ataX.Y' link; that'll require even more sysfs trickery.
Let's see if I can come up with something.
So yeah, let's hold off the patch for now.

First I need to get a PMP cable to test things out :-)

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
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