linux-kernel - Re: [RFC PATCH 1/1] zram: Allow rw_page when page isn't written back.

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Message-ID: <YvG6fDHmVITsa/Kk@google.com>
Date:   Tue, 9 Aug 2022 10:38:04 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Brian Geffon <bgeffon@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        linux-kernel@...r.kernel.org,
        Suleiman Souhlal <suleiman@...gle.com>, linux-mm@...ck.org
Subject: Re: [RFC PATCH 1/1] zram: Allow rw_page when page isn't written back.

On (22/08/08 12:50), Brian Geffon wrote:
[..]
>  
>  	pr_info("setup backing device %s\n", file_name);
> @@ -722,7 +707,8 @@ static ssize_t writeback_store(struct device *dev,
>  
>  		if (zram_test_flag(zram, index, ZRAM_WB) ||
>  				zram_test_flag(zram, index, ZRAM_SAME) ||
> -				zram_test_flag(zram, index, ZRAM_UNDER_WB))
> +				zram_test_flag(zram, index, ZRAM_UNDER_WB) ||
> +				zram_test_flag(zram, index, ZRAM_NO_WB))
>  			goto next;

mark_idle() probably should also test ZRAM_NO_WB bit.