From: Christoph Hellwig <hch@infradead.org>
To: Jan Kara <jack@suse.cz>
Cc: Matthew Bobrowski <mbobrowski@mbobrowski.org>,
tytso@mit.edu, adilger.kernel@dilger.ca,
linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,
hch@infradead.org, david@fromorbit.com, darrick.wong@oracle.com
Subject: Re: [PATCH v4 8/8] ext4: introduce direct I/O write path using iomap infrastructure
Date: Wed, 9 Oct 2019 00:11:45 -0700 [thread overview]
Message-ID: <20191009071145.GB32281@infradead.org> (raw)
In-Reply-To: <20191008151238.GK5078@quack2.suse.cz>
On Tue, Oct 08, 2019 at 05:12:38PM +0200, Jan Kara wrote:
> Seeing how difficult it is when a filesystem wants to complete the iocb
> synchronously (regardless whether it is async or sync) and have all the
> information in one place for further processing, I think it would be the
> easiest to provide iomap_dio_rw_wait() that forces waiting for the iocb to
> complete *and* returns the appropriate return value instead of pretty
> useless EIOCBQUEUED. It is actually pretty trivial (patch attached). With
> this we can then just call iomap_dio_rw_sync() for the inode extension case
> with ->end_io doing just the unwritten extent processing and then call
> ext4_handle_inode_extension() from ext4_direct_write_iter() where we would
> have all the information we need.
>
> Christoph, Darrick, what do you think about extending iomap like in the
> attached patch (plus sample use in XFS)?
I vaguely remember suggesting something like this but Brian or Dave
convinced me it wasn't a good idea. This will require a trip to the
xfs or fsdevel archives from when the inode_dio_wait was added in XFS.
But if we decide it actully works this time around please don't add the
__ variant but just add the parameter to iomap_dio_rw directly.
next prev parent reply other threads:[~2019-10-09 7:11 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 11:32 [PATCH v4 0/8] ext4: port direct I/O to iomap infrastructure Matthew Bobrowski
2019-10-03 11:33 ` [PATCH v4 1/8] ext4: move out iomap field population into separate helper Matthew Bobrowski
2019-10-08 10:27 ` Jan Kara
2019-10-09 8:57 ` Matthew Bobrowski
2019-10-09 13:06 ` Jan Kara
2019-10-10 5:39 ` Matthew Bobrowski
2019-10-09 6:02 ` Ritesh Harjani
2019-10-09 7:07 ` Christoph Hellwig
2019-10-09 7:50 ` Ritesh Harjani
2019-10-09 9:09 ` Matthew Bobrowski
2019-10-03 11:33 ` [PATCH v4 2/8] ext4: move out IOMAP_WRITE path " Matthew Bobrowski
2019-10-08 10:31 ` Jan Kara
2019-10-09 9:18 ` Matthew Bobrowski
2019-10-09 6:22 ` Ritesh Harjani
2019-10-09 9:31 ` Matthew Bobrowski
2019-10-03 11:33 ` [PATCH v4 3/8] ext4: introduce new callback for IOMAP_REPORT operations Matthew Bobrowski
2019-10-08 10:42 ` Jan Kara
2019-10-09 9:41 ` Matthew Bobrowski
2019-10-09 6:00 ` Ritesh Harjani
2019-10-09 12:08 ` Matthew Bobrowski
2019-10-09 13:14 ` Ritesh Harjani
2019-10-03 11:34 ` [PATCH v4 4/8] ext4: introduce direct I/O read path using iomap infrastructure Matthew Bobrowski
2019-10-08 10:52 ` Jan Kara
2019-10-09 10:55 ` Matthew Bobrowski
2019-10-09 6:39 ` Ritesh Harjani
2019-10-03 11:34 ` [PATCH v4 5/8] ext4: move inode extension/truncate code out from ->iomap_end() callback Matthew Bobrowski
2019-10-08 11:25 ` Jan Kara
2019-10-09 10:18 ` Matthew Bobrowski
2019-10-09 12:51 ` Jan Kara
2019-10-10 5:44 ` Matthew Bobrowski
2019-10-09 6:27 ` Ritesh Harjani
2019-10-09 10:20 ` Matthew Bobrowski
2019-10-03 11:34 ` [PATCH v4 6/8] ext4: move inode extension checks out from ext4_iomap_alloc() Matthew Bobrowski
2019-10-08 11:27 ` Jan Kara
2019-10-09 10:21 ` Matthew Bobrowski
2019-10-09 6:30 ` Ritesh Harjani
2019-10-09 10:39 ` Matthew Bobrowski
2019-10-03 11:34 ` [PATCH v4 7/8] ext4: reorder map.m_flags checks in ext4_set_iomap() Matthew Bobrowski
2019-10-08 11:30 ` Jan Kara
2019-10-09 10:42 ` Matthew Bobrowski
2019-10-09 6:35 ` Ritesh Harjani
2019-10-09 10:43 ` Matthew Bobrowski
2019-10-03 11:35 ` [PATCH v4 8/8] ext4: introduce direct I/O write path using iomap infrastructure Matthew Bobrowski
2019-10-08 15:12 ` Jan Kara
2019-10-09 7:11 ` Christoph Hellwig [this message]
2019-10-09 13:41 ` Jan Kara
2019-10-09 11:53 ` Matthew Bobrowski
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