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Date: Tue, 12 Jan 2021 13:36:33 -0800 From: Andres Freund <andres@...razel.de> To: "Darrick J. Wong" <darrick.wong@...cle.com> Cc: Andreas Dilger <adilger@...ger.ca>, Christoph Hellwig <hch@...radead.org>, Avi Kivity <avi@...lladb.com>, linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org, linux-block@...r.kernel.org Subject: Re: fallocate(FALLOC_FL_ZERO_RANGE_BUT_REALLY) to avoid unwritten extents? Hi, On 2021-01-12 13:14:45 -0800, Darrick J. Wong wrote: > ALLOCSP64 can only allocate pre-zeroed blocks as part of extending EOF, > whereas a new FZERO flag means that we can pre-zero an arbitrary range > of bytes in a file. I don't know if Avi or Andres' usecases demand that > kind of flexibilty but I know I'd rather go for the more powerful > interface. Postgres/I don't at the moment have a need to allocate "written" zeroed space anywhere but EOF. I can see some potential uses for more flexible pre-zeroing in the future though, but not very near term. Greetings, Andres Freund
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