linux-kernel - Re: [PATCH] fix page_count in ->iomap_migrate

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Message-ID: <5cd9ea0d-4c1c-fd4d-4e29-0ee71ef272a0@mail.ru>
Date:   Sat, 15 Dec 2018 12:26:25 +0800
From:   Gao Xiang <hsiangkao@...l.ru>
To:     zhangjun <openzhangj@...il.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Richard Weinberger <richard@....at>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] fix page_count in ->iomap_migrate_page()


On 2018/12/14 13:56, zhangjun wrote:
> IOMAP uses PG_private a little different with buffer_head based
> filesystem.
> It uses it as marker and when set, the page counter is not incremented,
> migrate_page_move_mapping() assumes that PG_private indicates a counter
> of +1.
> so, we have to pass a extra count of -1 to migrate_page_move_mapping()
> if the flag is set.
> 
> Signed-off-by: zhangjun <openzhangj@...il.com>
> ---

I found that it fixed in
https://patchwork.kernel.org/patch/10684835/
and has been merged in
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=61c6de667263184125d5ca75e894fcad632b0dd3

It seems it has been corrected by Piotr.

Thanks,
Gao Xiang