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Date: Tue, 3 Feb 2015 10:54:33 +0900
From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linux-MM <linux-mm@kvack.org>, Nitin Gupta <ngupta@vflare.org>,
        Jerome Marchand <jmarchan@redhat.com>,
        Ganesh Mahendran <opensource.ganesh@gmail.com>
Subject: Re: [PATCH v1 2/2] zram: remove init_lock in zram_make_request
Message-ID: <20150203015433.GA454@swordfish>
References: <20150202034100.GF6402@blaptop>
 <20150202055923.GA332@swordfish>
 <20150202061812.GJ6402@blaptop>
 <20150202070604.GA666@swordfish>
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On (02/02/15 16:06), Sergey Senozhatsky wrote:
> So, guys, how about doing it differently, in less lines of code,
> hopefully. Don't move reset_store()'s work to zram_reset_device().
> Instead, move
> 
> 	set_capacity(zram->disk, 0);
> 	revalidate_disk(zram->disk);
> 
> out from zram_reset_device() to reset_store(). this two function are
> executed only when called from reset_store() anyway. this also will let
> us drop `bool reset capacity' param from zram_reset_device().
> 
> 
> so we will do in reset_store()
> 
> 	mutex_lock(bdev->bd_mutex);
> 
> 	fsync_bdev(bdev);
> 	zram_reset_device(zram);
> 	set_capacity(zram->disk, 0);
> 
> 	mutex_unlock(&bdev->bd_mutex);
> 
> 	revalidate_disk(zram->disk);
> 	bdput(bdev);
> 
> 
> 
> and change zram_reset_device(zram, false) call to simply zram_reset_device(zram)
> in __exit zram_exit(void).
> 

Hello,

Minchan, Ganesh, I sent a patch last night, with the above solution.
looks ok to you?

Minchan, I think I'll send my small struct zram clean-up patch after
your init_lock patch. what's your opinion?

	-ss