Re: dm: add swap_slot_free_notify handler

["David Kwon (권원홍)" <wonhong.kwon@xxxxxxx>]

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@xxxxxxxxxx>
Date: 2016년 9월 22일 목요일 오전 9:14
To: David <wonhong.kwon@xxxxxxx>
Cc: <agk@xxxxxxxxxx>, <dm-devel@xxxxxxxxxx>, '이건호' <gunho.lee@xxxxxxx>
Subject: Re: dm: add swap_slot_free_notify handler

On Wed, Sep 21 2016 at  7:09pm -0400,

Wonhong Kwon <wonhong.kwon@xxxxxxx> 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@xxxxxxx>

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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