From: Christoph Hellwig <hch@lst.de>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>,
brauner@kernel.org, cem@kernel.org, dchinner@redhat.com,
hch@lst.de, ritesh.list@gmail.com, linux-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
martin.petersen@oracle.com
Subject: Re: [PATCH v2 2/7] iomap: Add zero unwritten mappings dio support
Date: Fri, 13 Dec 2024 15:47:40 +0100 [thread overview]
Message-ID: <20241213144740.GA17593@lst.de> (raw)
In-Reply-To: <20241212204007.GL6678@frogsfrogsfrogs>
On Thu, Dec 12, 2024 at 12:40:07PM -0800, Darrick J. Wong wrote:
> > However, I still think that we should be able to atomic write mixed extents,
> > even though it is a pain to implement. To that end, I could be convinced
> > again that we don't require it...
>
> Well... if you /did/ add a few entries to include/uapi/linux/fs.h for
> ways that an untorn write can fail, then we could define the programming
> interface as so:
>
> "If you receive -EBADMAP, then call fallocate(FALLOC_FL_MAKE_OVERWRITE)
> to force all the mappings to pure overwrites."
Ewwwwwwwwwwwwwwwwwwwww.
That's not a sane API in any way.
> ...since there have been a few people who have asked about that ability
> so that they can write+fdatasync without so much overhead from file
> metadata updates.
And all of them fundamentally misunderstood file system semantics and/or
used weird bypasses that are dommed to corrupt the file system sooner
or later.
next prev parent reply other threads:[~2024-12-13 14:47 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-10 12:57 [PATCH v2 0/7] large atomic writes for xfs John Garry
2024-12-10 12:57 ` [PATCH v2 1/7] iomap: Increase iomap_dio_zero() size limit John Garry
2024-12-10 12:57 ` [PATCH v2 2/7] iomap: Add zero unwritten mappings dio support John Garry
2024-12-11 23:47 ` Darrick J. Wong
2024-12-12 10:40 ` John Garry
2024-12-12 20:40 ` Darrick J. Wong
2024-12-13 10:43 ` John Garry
2024-12-13 14:47 ` Christoph Hellwig [this message]
2024-12-14 0:56 ` Darrick J. Wong
2024-12-17 7:08 ` Christoph Hellwig
2024-12-18 11:15 ` John Garry
2025-01-08 1:26 ` Darrick J. Wong
2025-01-08 11:39 ` John Garry
2025-01-08 17:42 ` Darrick J. Wong
2025-01-09 7:54 ` Christoph Hellwig
2025-01-10 11:59 ` John Garry
2024-12-10 12:57 ` [PATCH v2 3/7] iomap: Lift blocksize restriction on atomic writes John Garry
2024-12-10 12:57 ` [PATCH v2 4/7] xfs: Add extent zeroing support for " John Garry
2024-12-10 12:57 ` [PATCH v2 5/7] xfs: Switch atomic write size check in xfs_file_write_iter() John Garry
2024-12-10 12:57 ` [PATCH v2 6/7] xfs: Add RT atomic write unit max to xfs_mount John Garry
2024-12-10 12:57 ` [PATCH v2 7/7] xfs: Update xfs_get_atomic_write_attr() for large atomic writes John Garry
2024-12-13 14:38 ` [PATCH v2 0/7] large atomic writes for xfs Christoph Hellwig
2024-12-13 17:15 ` John Garry
2024-12-13 17:22 ` Christoph Hellwig
2024-12-13 17:43 ` John Garry
2024-12-14 0:42 ` Darrick J. Wong
2024-12-16 8:40 ` John Garry
2024-12-17 7:11 ` Christoph Hellwig
2024-12-17 8:23 ` John Garry
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