From: Christoph Hellwig <hch@lst.de>
To: Dave Chinner <david@fromorbit.com>
Cc: Florian Weimer <fweimer@redhat.com>,
Christoph Hellwig <hch@lst.de>,
Matthew Wilcox <willy@infradead.org>,
Hans Holmberg <hans.holmberg@wdc.com>,
linux-xfs@vger.kernel.org, Carlos Maiolino <cem@kernel.org>,
"Darrick J . Wong" <djwong@kernel.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
libc-alpha@sourceware.org
Subject: Re: [RFC] xfs: fake fallocate success for always CoW inodes
Date: Tue, 11 Nov 2025 09:56:59 +0100 [thread overview]
Message-ID: <20251111085659.GA11723@lst.de> (raw)
In-Reply-To: <aRJK5LqJnrT5KAyH@dread.disaster.area>
On Tue, Nov 11, 2025 at 07:28:20AM +1100, Dave Chinner wrote:
> IOWs, I have no problems with COW filesystems not doing
> preallocation, but if they are going to return success they still
> need to perform all the non-allocation parts of fallocate()
> operations correctly.
>
> Again, I don't see a need for a new API here to provide
> non-destructive "truncate up only" semantics as we already have
> those semantics built into the ALLOCATE_RANGE operation...
The problem it loses the ability of an intelligent application using
the low-level Linux API to probe what is there. That might not be a
major issue, but it is an issue at least.
next prev parent reply other threads:[~2025-11-11 8:57 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-06 13:35 [RFC] xfs: fake fallocate success for always CoW inodes Hans Holmberg
2025-11-06 13:48 ` Florian Weimer
2025-11-06 13:52 ` Christoph Hellwig
2025-11-06 14:42 ` Matthew Wilcox
2025-11-06 14:46 ` Christoph Hellwig
2025-11-11 8:31 ` Hans Holmberg
2025-11-11 9:05 ` hch
2025-11-11 9:50 ` Florian Weimer
2025-11-11 13:40 ` hch
2025-11-06 16:31 ` Florian Weimer
2025-11-06 17:05 ` Christoph Hellwig
2025-11-08 12:30 ` Florian Weimer
2025-11-09 22:15 ` Dave Chinner
2025-11-10 5:27 ` Florian Weimer
2025-11-10 9:38 ` Christoph Hellwig
2025-11-10 10:03 ` Florian Weimer
2025-11-10 20:28 ` Dave Chinner
2025-11-11 8:56 ` Christoph Hellwig [this message]
2025-11-10 9:37 ` Christoph Hellwig
2025-11-10 9:44 ` Florian Weimer
2025-11-10 21:33 ` Dave Chinner
2025-11-11 9:04 ` Christoph Hellwig
2025-11-11 9:30 ` Florian Weimer
2025-11-10 9:31 ` Christoph Hellwig
2025-11-10 9:48 ` truncatat? was, " Christoph Hellwig
2025-11-10 10:00 ` Florian Weimer
2025-11-10 9:49 ` Florian Weimer
2025-11-10 9:52 ` Christoph Hellwig
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