From: Matthew Wilcox <willy@infradead.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: 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: Thu, 15 Oct 2020 20:03:12 +0100 [thread overview]
Message-ID: <20201015190312.GB20115@casper.infradead.org> (raw)
In-Reply-To: <20201015175848.GA4145@infradead.org>
On Thu, Oct 15, 2020 at 06:58:48PM +0100, Christoph Hellwig wrote:
> On Thu, Oct 15, 2020 at 05:43:33PM +0100, Matthew Wilcox wrote:
> > I prefer assigning ctx conditionally to propagating the knowledge
> > that !rac means synchronous. I've gone with this:
>
> And I really hate these kinds of conditional assignments. If the
> ->rac check is too raw please just add an explicit
>
> bool synchronous : 1;
>
> flag.
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.
> 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;
next prev parent reply other threads:[~2020-10-15 19:03 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 [this message]
2020-10-16 6:35 ` Christoph Hellwig
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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