From: Matthew Wilcox <willy@infradead.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Joanne Koong <joannelkoong@gmail.com>,
brauner@kernel.org, miklos@szeredi.hu, djwong@kernel.org,
linux-fsdevel@vger.kernel.org, kernel-team@meta.com,
linux-xfs@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [PATCH v1 05/16] iomap: propagate iomap_read_folio() error to caller
Date: Thu, 4 Sep 2025 22:13:14 +0100 [thread overview]
Message-ID: <aLoA6nkQKGqG04pW@casper.infradead.org> (raw)
In-Reply-To: <aLktHFhtV_4seMDN@infradead.org>
On Wed, Sep 03, 2025 at 11:09:32PM -0700, Christoph Hellwig wrote:
> On Fri, Aug 29, 2025 at 04:56:16PM -0700, Joanne Koong wrote:
> > Propagate any error encountered in iomap_read_folio() back up to its
> > caller (otherwise a default -EIO will be passed up by
> > filemap_read_folio() to callers). This is standard behavior for how
> > other filesystems handle their ->read_folio() errors as well.
>
> Is it? As far as I remember we, or willy in particular has been
> trying to kill this error return - it isn't very hepful when the
> actually interesting real errors only happen on async completion
> anyway.
I killed the error return from ->readahead (formerly readpages).
By definition, nobody is interested in the error of readahead
since nobody asked for the data in those pages.
I designed an error reporting mechanism a while back that allowed the
errno to propagate from completion context to whoever was waiting
on the folio(s) that were part of a read request. I can dig that
patchset up again if there's interest.
next prev parent reply other threads:[~2025-09-04 21:13 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-29 23:56 [PATCH v1 00/16] fuse: use iomap for buffered reads + readahead Joanne Koong
2025-08-29 23:56 ` [PATCH v1 01/16] iomap: move async bio read logic into helper function Joanne Koong
2025-09-03 20:16 ` Darrick J. Wong
2025-09-04 6:00 ` Christoph Hellwig
2025-09-04 21:44 ` Joanne Koong
2025-08-29 23:56 ` [PATCH v1 02/16] iomap: rename cur_folio_in_bio to folio_unlocked Joanne Koong
2025-09-03 20:26 ` [PATCH v1 02/16] iomap: rename cur_folio_in_bio to folio_unlockedOM Darrick J. Wong
2025-09-04 6:03 ` Christoph Hellwig
2025-09-04 22:06 ` Joanne Koong
2025-09-05 15:03 ` Darrick J. Wong
2025-08-29 23:56 ` [PATCH v1 03/16] iomap: refactor read/readahead completion Joanne Koong
2025-09-04 6:05 ` Christoph Hellwig
2025-09-04 23:16 ` Joanne Koong
2025-08-29 23:56 ` [PATCH v1 04/16] iomap: use iomap_iter->private for stashing read/readahead bio Joanne Koong
2025-09-03 20:30 ` Darrick J. Wong
2025-09-04 6:07 ` Christoph Hellwig
2025-09-04 22:20 ` Joanne Koong
2025-09-04 23:15 ` Joanne Koong
2025-08-29 23:56 ` [PATCH v1 05/16] iomap: propagate iomap_read_folio() error to caller Joanne Koong
2025-09-03 20:32 ` Darrick J. Wong
2025-09-04 6:09 ` Christoph Hellwig
2025-09-04 21:13 ` Matthew Wilcox [this message]
2025-08-29 23:56 ` [PATCH v1 06/16] iomap: move read/readahead logic out of CONFIG_BLOCK guard Joanne Koong
2025-08-29 23:56 ` [PATCH v1 07/16] iomap: iterate through entire folio in iomap_readpage_iter() Joanne Koong
2025-09-03 20:43 ` Darrick J. Wong
2025-09-04 22:37 ` Joanne Koong
2025-09-04 6:14 ` Christoph Hellwig
2025-09-04 22:45 ` Joanne Koong
2025-08-29 23:56 ` [PATCH v1 08/16] iomap: rename iomap_readpage_iter() to iomap_readfolio_iter() Joanne Koong
2025-09-04 6:15 ` Christoph Hellwig
2025-09-04 22:47 ` Joanne Koong
2025-08-29 23:56 ` [PATCH v1 09/16] iomap: rename iomap_readpage_ctx struct to iomap_readfolio_ctx Joanne Koong
2025-09-03 20:44 ` Darrick J. Wong
2025-08-29 23:56 ` [PATCH v1 10/16] iomap: add iomap_start_folio_read() helper Joanne Koong
2025-09-03 20:52 ` Darrick J. Wong
2025-08-29 23:56 ` [PATCH v1 11/16] iomap: make start folio read and finish folio read public APIs Joanne Koong
2025-09-03 20:53 ` Darrick J. Wong
2025-09-04 6:15 ` Christoph Hellwig
2025-08-29 23:56 ` [PATCH v1 12/16] iomap: add iomap_read_ops for read and readahead Joanne Koong
2025-09-03 21:08 ` Darrick J. Wong
2025-09-04 20:58 ` Joanne Koong
2025-09-04 6:21 ` Christoph Hellwig
2025-09-04 21:38 ` Joanne Koong
2025-08-29 23:56 ` [PATCH v1 13/16] iomap: add a private arg " Joanne Koong
2025-08-30 1:54 ` Gao Xiang
2025-09-02 21:24 ` Joanne Koong
2025-09-03 1:55 ` Gao Xiang
2025-09-04 23:29 ` Joanne Koong
2025-09-05 2:21 ` Gao Xiang
2025-09-05 15:21 ` Darrick J. Wong
2025-09-03 21:11 ` Darrick J. Wong
2025-08-29 23:56 ` [PATCH v1 14/16] fuse: use iomap for read_folio Joanne Koong
2025-09-03 21:13 ` Darrick J. Wong
2025-08-29 23:56 ` [PATCH v1 15/16] fuse: use iomap for readahead Joanne Koong
2025-09-03 21:17 ` Darrick J. Wong
2025-09-04 19:40 ` Joanne Koong
2025-09-04 19:46 ` Joanne Koong
2025-08-29 23:56 ` [PATCH v1 16/16] fuse: remove fuse_readpages_end() null mapping check Joanne Koong
2025-09-02 9:21 ` Miklos Szeredi
2025-09-02 21:19 ` Joanne Koong
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