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From: Andrew Morton <akpm@linux-foundation.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Naohiro Aota <naohiro.aota@wdc.com>,
	linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	linux-block@vger.kernel.org
Subject: Re: [PATCH v2] mm, swap: disallow swapon() on zoned block devices
Date: Tue, 15 Oct 2019 13:43:57 -0700	[thread overview]
Message-ID: <20191015134357.042f39a02ae438d961aa2aca@linux-foundation.org> (raw)
In-Reply-To: <20191015090641.GB7199@infradead.org>

On Tue, 15 Oct 2019 02:06:41 -0700 Christoph Hellwig <hch@infradead.org> wrote:

> > +		/*
> > +		 * Zoned block device contains zones that have
> > +		 * sequential write only restriction. For the restriction,
> > +		 * zoned block devices are not suitable for a swap device.
> > +		 * Disallow them here.
> > +		 */
> > +		if (blk_queue_is_zoned(p->bdev->bd_queue))
> 
> Please use up all 80 chars per line  Otherwise this looks fine:

I redid the text a bit as well.

--- a/mm/swapfile.c~mm-swap-disallow-swapon-on-zoned-block-devices-fix
+++ a/mm/swapfile.c
@@ -2888,10 +2888,9 @@ static int claim_swapfile(struct swap_in
 		if (error < 0)
 			return error;
 		/*
-		 * Zoned block device contains zones that have
-		 * sequential write only restriction. For the restriction,
-		 * zoned block devices are not suitable for a swap device.
-		 * Disallow them here.
+		 * Zoned block devices contain zones that have a sequential
+		 * write only restriction.  Hence zoned block devices are not
+		 * suitable for swapping.  Disallow them here.
 		 */
 		if (blk_queue_is_zoned(p->bdev->bd_queue))
 			return -EINVAL;
_


  reply	other threads:[~2019-10-15 20:44 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-15  4:38 [PATCH] mm, swap: disallow swapon() on zoned block devices Naohiro Aota
2019-10-15  7:57 ` Christoph Hellwig
2019-10-15  8:58 ` [PATCH v2] " Naohiro Aota
2019-10-15  9:06   ` Christoph Hellwig
2019-10-15 20:43     ` Andrew Morton [this message]
2019-10-15 11:35 ` Project idea: Swap to " Matthew Wilcox
2019-10-15 13:27   ` Theodore Y. Ts'o
2019-10-15 13:48   ` Hannes Reinecke
2019-10-15 14:50     ` Christopher Lameter
2019-10-15 15:09     ` Matthew Wilcox
2019-10-15 15:22       ` Hannes Reinecke

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