[dm-devel] dm: add swap_slot_free_notify handler

[David Kwon (=?EUC-KR?B?sce/+Mir?=)]

Understood. Now I’m developing some target which is using this interface
locally, and I’ll send this patch again when I push this target to upstream.

From:  Mike Snitzer <snitzer at redhat.com>
Date:  2016년 9월 22일 목요일 오전 9:14
To:  David <wonhong.kwon at lge.com>
Cc:  <agk at redhat.com>, <dm-devel at redhat.com>, '이건호' <gunho.lee at lge.com>
Subject:  Re: dm: add swap_slot_free_notify handler

> On Wed, Sep 21 2016 at  7:09pm -0400,
> Wonhong Kwon <wonhong.kwon at lge.com> wrote:
> 
>>  swap_slot_free_notify callback has been added to block_device_operations to
>>  allow freeing memory allocated by RAM-based swap device like zram or zswap
>>  more aggressively.
>>  
>>  In case of device mapper, it is also required if mapped target is being
>>  used as swap device and it uses some in-memory metadata for swap entries.
>>  This patch introduces swap_slot_free_notify callback into dm_blk_ops and
>>  target device can implement its own handler to handle this via
>>  slot_free_notify in target_type.
>>  
>>  Signed-off-by: Wonhong Kwon <wonhong.kwon at lge.com>
> 
> This change to DM core only makes sense once we have an upstream DM
> target that implements slot_free_notify hook.
> 


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