From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: "Darrick J. Wong" <djwong@kernel.org>,
jane.chu@oracle.com, linux-xfs@vger.kernel.org,
hch@infradead.org, dan.j.williams@intel.com,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 3/5] vfs: add a zero-initialization mode to fallocate
Date: Tue, 21 Sep 2021 09:31:43 +0100 [thread overview]
Message-ID: <YUmYbxW70Ub2ytOc@infradead.org> (raw)
In-Reply-To: <20210921004431.GO1756565@dread.disaster.area>
On Tue, Sep 21, 2021 at 10:44:31AM +1000, Dave Chinner wrote:
> I think this wants to be a behavioural modifier for existing
> operations rather than an operation unto itself. i.e. similar to how
> KEEP_SIZE modifies ALLOC behaviour but doesn't fundamentally alter
> the guarantees ALLOC provides userspace.
>
> In this case, the change of behaviour over ZERO_RANGE is that we
> want physical zeros to be written instead of the filesystem
> optimising away the physical zeros by manipulating the layout
> of the file.
Yes.
> Then we have and API that looks like:
>
> ALLOC - allocate space efficiently
> ALLOC | INIT - allocate space by writing zeros to it
> ZERO - zero data and preallocate space efficiently
> ZERO | INIT - zero range by writing zeros to it
>
> Which seems to cater for all the cases I know of where physically
> writing zeros instead of allocating unwritten extents is the
> preferred behaviour of fallocate()....
Agreed. I'm not sure INIT is really the right name, but I can't come
up with a better idea offhand.
next prev parent reply other threads:[~2021-09-21 8:32 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-18 1:30 [PATCHSET RFC v2 jane 0/5] vfs: enable userspace to reset damaged file storage Darrick J. Wong
2021-09-18 1:30 ` [PATCH 1/5] dax: prepare pmem for use by zero-initializing contents and clearing poisons Darrick J. Wong
2021-09-18 16:54 ` riteshh
2021-09-20 17:22 ` Darrick J. Wong
2021-09-21 4:07 ` riteshh
2021-09-22 18:26 ` Darrick J. Wong
2021-09-22 19:47 ` riteshh
2021-09-22 20:26 ` Dan Williams
2021-09-21 8:34 ` Christoph Hellwig
2021-09-22 18:10 ` Darrick J. Wong
2021-09-18 1:30 ` [PATCH 2/5] iomap: use accelerated zeroing on a block device to zero a file range Darrick J. Wong
2021-09-18 16:55 ` riteshh
2021-09-21 8:29 ` Christoph Hellwig
2021-09-22 18:53 ` Darrick J. Wong
2021-09-21 22:33 ` Dave Chinner
2021-09-22 18:54 ` Darrick J. Wong
2021-09-18 1:31 ` [PATCH 3/5] vfs: add a zero-initialization mode to fallocate Darrick J. Wong
2021-09-18 16:58 ` riteshh
2021-09-20 17:52 ` Eric Biggers
2021-09-20 18:06 ` Darrick J. Wong
2021-09-21 0:44 ` Dave Chinner
2021-09-21 8:31 ` Christoph Hellwig [this message]
2021-09-22 2:16 ` Dan Williams
2021-09-22 2:38 ` Darrick J. Wong
2021-09-22 3:59 ` Dave Chinner
2021-09-22 4:13 ` Darrick J. Wong
2021-09-22 5:49 ` Dave Chinner
2021-09-22 21:27 ` Darrick J. Wong
2021-09-23 0:02 ` Darrick J. Wong
2021-09-23 0:44 ` Darrick J. Wong
2021-09-23 1:42 ` Dave Chinner
2021-09-23 2:43 ` Dan Williams
2021-09-23 5:42 ` Dan Williams
2021-09-23 22:54 ` Dave Chinner
2021-09-24 1:18 ` Dan Williams
2021-09-24 1:21 ` Jane Chu
2021-09-24 1:35 ` Darrick J. Wong
2021-09-27 21:07 ` Dave Chinner
2021-09-27 21:57 ` Jane Chu
2021-09-28 0:08 ` Dan Williams
2021-09-22 5:28 ` riteshh
2021-09-18 1:31 ` [PATCH 4/5] xfs: implement FALLOC_FL_ZEROINIT_RANGE Darrick J. Wong
2021-09-18 1:31 ` [PATCH 5/5] ext4: " Darrick J. Wong
2021-09-18 17:07 ` riteshh
2021-09-20 18:11 ` Darrick J. Wong
2021-09-21 6:10 ` riteshh
2021-09-18 18:05 ` [PATCHSET RFC v2 jane 0/5] vfs: enable userspace to reset damaged file storage Dan Williams
2021-09-23 0:51 ` Darrick J. Wong
2021-09-23 1:17 ` Dan Williams
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