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Date: Wed, 15 Jan 2020 20:55:02 +0000 From: David Howells <dhowells@...hat.com> To: Andreas Dilger <adilger@...ger.ca> Cc: dhowells@...hat.com, Christoph Hellwig <hch@....de>, Qu Wenruo <quwenruo.btrfs@....com>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Al Viro <viro@...iv.linux.org.uk>, "Theodore Y. Ts'o" <tytso@....edu>, "Darrick J. Wong" <darrick.wong@...cle.com>, Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, David Sterba <dsterba@...e.com>, linux-ext4 <linux-ext4@...r.kernel.org>, linux-xfs <linux-xfs@...r.kernel.org>, linux-btrfs <linux-btrfs@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: Problems with determining data presence by examining extents? Andreas Dilger <adilger@...ger.ca> wrote: > I think what is needed here is an fadvise/ioctl that tells the filesystem > "don't allocate blocks unless actually written" for that file. Yeah - and it would probably need to find its way onto disk so that its effect is persistent and visible to out-of-kernel tools. It would also have to say that blocks of zeros shouldn't be optimised away. David
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