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From: Christoph Hellwig <hch@infradead.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	v9fs-developer@lists.sourceforge.net,
	linux-kernel@vger.kernel.org, linux-afs@lists.infradead.org,
	ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org,
	ecryptfs@vger.kernel.org, linux-um@lists.infradead.org,
	linux-mtd@lists.infradead.org,
	Richard Weinberger <richard@nod.at>,
	linux-xfs@vger.kernel.org
Subject: Re: [PATCH v2 16/16] iomap: Make readpage synchronous
Date: Fri, 16 Oct 2020 07:35:46 +0100	[thread overview]
Message-ID: <20201016063546.GA4808@infradead.org> (raw)
In-Reply-To: <20201015190312.GB20115@casper.infradead.org>

On Thu, Oct 15, 2020 at 08:03:12PM +0100, Matthew Wilcox wrote:
> I honestly don't see the problem.  We have to assign the status
> conditionally anyway so we don't overwrite an error with a subsequent
> success.

Yes, but having a potential NULL pointer to a common structure is just
waiting for trouble.

> 
> > True.  I'd still prefer the AOP_UPDATED_PAGE as the fallthrough case
> > and an explicit goto out_unlock, though.
> 
> So this?
> 
>         if (ctx.bio) {
>                 submit_bio(ctx.bio);
>                 wait_for_completion(&ctx.done);
>                 if (ret < 0)
>                         goto err;
>                 ret = blk_status_to_errno(ctx.status);
>         }
> 
>         if (ret < 0)
>                 goto err;
>         return AOP_UPDATED_PAGE;
> err:
>         unlock_page(page);
>         return ret;
> 

Looks good.

  reply	other threads:[~2020-10-16  6:35 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-09 14:30 [PATCH v2 00/16] Allow readpage to return a locked page Matthew Wilcox (Oracle)
2020-10-09 14:30 ` [PATCH v2 01/16] mm: Add AOP_UPDATED_PAGE return value Matthew Wilcox (Oracle)
2020-10-15  9:06   ` Christoph Hellwig
2020-10-15 14:06     ` Matthew Wilcox
2020-10-09 14:30 ` [PATCH v2 02/16] mm: Inline wait_on_page_read into its one caller Matthew Wilcox (Oracle)
2020-10-15  9:08   ` Christoph Hellwig
2020-10-09 14:30 ` [PATCH v2 03/16] 9p: Tell the VFS that readpage was synchronous Matthew Wilcox (Oracle)
2020-10-09 14:30 ` [PATCH v2 04/16] afs: " Matthew Wilcox (Oracle)
2020-10-09 14:30 ` [PATCH v2 05/16] ceph: " Matthew Wilcox (Oracle)
2020-10-09 14:30 ` [PATCH v2 06/16] cifs: " Matthew Wilcox (Oracle)
2020-10-09 14:30 ` [PATCH v2 07/16] cramfs: " Matthew Wilcox (Oracle)
2020-10-09 14:30 ` [PATCH v2 08/16] ecryptfs: " Matthew Wilcox (Oracle)
2020-10-09 14:30 ` [PATCH v2 09/16] fuse: " Matthew Wilcox (Oracle)
2020-10-09 14:30 ` [PATCH v2 10/16] hostfs: " Matthew Wilcox (Oracle)
2020-10-09 14:30 ` [PATCH v2 11/16] jffs2: " Matthew Wilcox (Oracle)
2020-10-09 14:31 ` [PATCH v2 12/16] ubifs: " Matthew Wilcox (Oracle)
2020-10-09 14:31 ` [PATCH v2 13/16] udf: " Matthew Wilcox (Oracle)
2020-10-09 14:31 ` [PATCH v2 14/16] vboxsf: " Matthew Wilcox (Oracle)
2020-10-09 14:31 ` [PATCH v2 15/16] iomap: Inline iomap_iop_set_range_uptodate into its one caller Matthew Wilcox (Oracle)
2020-10-15  9:08   ` Christoph Hellwig
2020-10-09 14:31 ` [PATCH v2 16/16] iomap: Make readpage synchronous Matthew Wilcox (Oracle)
2020-10-15  9:42   ` Christoph Hellwig
2020-10-15 16:43     ` Matthew Wilcox
2020-10-15 17:58       ` Christoph Hellwig
2020-10-15 19:03         ` Matthew Wilcox
2020-10-16  6:35           ` Christoph Hellwig [this message]
2020-10-15  9:02 ` [PATCH v2 00/16] Allow readpage to return a locked page Christoph Hellwig
2020-10-15 11:49   ` Matthew Wilcox

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