Obsolete features (was Re: [PATCH 0/4] minio cleanup patches.)

[Xose Vazquez Perez <xose.vazquez@gmail.com>]

On 6/16/26 9:47 AM, Xose Vazquez Perez wrote:

> On 6/16/26 12:56 AM, Benjamin Marzinski wrote:
> 
>> On Mon, Jun 15, 2026 at 11:00:48PM +0200, Xose Vazquez Perez wrote:
>>> On 6/15/26 9:07 PM, Benjamin Marzinski wrote:
>>>
>>>> This patchset is to deprecate the rr_weight, rr_min_io_rq, and rr_min_io
>>>> multipath config options. It's a companion of the patchset to handle
>>>> their deprecation in the man pages.
>>>> https://lore.kernel.org/all/20260607103831.336833-2-xose.vazquez@gmail.com/
>>>>
>>>> It does not completely remove the minio setting code, since there are
>>>> ideas for reusing this in the future. The final patch is simply a change
>>>> to avoid a kernel warning message that I hit while testing these
>>>> patches.
> 
>>> Ben, thanks for this cleanup.
>>>
>>> I ran grep to see what remains of these options in the codebase.
>>> Could you please check if any of the following occurrences should have been
>>> removed, or if they are intended to stay for now?
>>>
>>> 8<---
>>> $ git grep -Ei "rr_weight|minio|min_io" | grep -vE "multipath.conf.5.in|deprecated"
>>>
>>
>> Good catch. It appears I misses some things.

> I ran the following command to locate previous "deprecated keywords":
> $ for i in $(git grep -h  deprecated libmultipath/dict.c | grep install_keyword | sort | uniq | awk -F\"  '{print $2}') ; do printf "\\n\n--- $i\n\n" ; git grep -i $i | grep -vE "install_keyword| multipath.conf.5.in|\.md|deprecated_handler" ; done
> 
> It looks like there is some leftover code that could also be cleaned up, such as:
> 
> --- disable_changed_wwids
> 
> libmultipath/defaults.h:#define DEFAULT_DISABLE_CHANGED_WWIDS 1
> 
> and also some checks in tests/hwtable.c.
Is this still necessary in "write_defaults : tests/hwtable.c" ?

                { "bindings_file", NULL },
                { "config_dir", NULL },
                { "multipath_dir", NULL },


Another candidate to drop is the retain_attached_hw_handler infrastructure:
  ( grep -Eir "hwhandler|hw_handler" )
Since Linux 4.3, the kernel always enforces "retain_attached_hw_handler yes".
Because this option is completely obsolete, could it be dropped from multipath-tools?


Regards.