linux-kernel - Re: [PATCH v2] erofs: fix erofs_get_meta

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Message-ID: <f77eb3c9-37c0-24a1-1d04-784baf181ff2@huawei.com>
Date:   Mon, 23 Sep 2019 20:16:57 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Gao Xiang <gaoxiang25@...wei.com>, <linux-erofs@...ts.ozlabs.org>
CC:     LKML <linux-kernel@...r.kernel.org>, Chao Yu <chao@...nel.org>,
        Miao Xie <miaoxie@...wei.com>, Fang Wei <fangwei1@...wei.com>
Subject: Re: [PATCH v2] erofs: fix erofs_get_meta_page locking by a cleanup

On 2019/9/22 2:43, Gao Xiang wrote:
> After doing more drop_caches stress test on
> our products, I found the mistake introduced by
> a very recent cleanup [1].
> 
> The current rule is that "erofs_get_meta_page"
> should be returned with page locked (although
> it's mostly unnecessary for read-only fs after
> pages are PG_uptodate), but a fix should be
> done for this.
> 
> [1] https://lore.kernel.org/r/20190904020912.63925-26-gaoxiang25@huawei.com
> Fixes: 618f40ea026b ("erofs: use read_cache_page_gfp for erofs_get_meta_page")
> Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,