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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pWeCK-0009om-D9; Mon, 27 Feb 2023 14:09:48 +0000 Date: Mon, 27 Feb 2023 14:09:48 +0000 From: Matthew Wilcox To: David Howells Cc: linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org, linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-mm@kvack.org, Hugh Dickins , linux-kernel@vger.kernel.org, fstests@vger.kernel.org Subject: Re: [PATCH 4/5] afs: Zero bytes after 'oldsize' if we're expanding the file Message-ID: References: <20230202204428.3267832-5-willy@infradead.org> <20230202204428.3267832-1-willy@infradead.org> <2730679.1677505767@warthog.procyon.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2730679.1677505767@warthog.procyon.org.uk> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: D11AC18001A X-Stat-Signature: r7enjwc6fqoz6e6cn53w77mhzowa4swr X-Rspam-User: X-HE-Tag: 1677506994-924637 X-HE-Meta: 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 ZJWmSopx iGmuWqz1HCxT1sAOzLeqGkNr6yjFIenUYH1eIgWdV/4ERRQDIlQD7skFSEYi+z/kdEhONX9f3SLyASClBEvf9pYl87WxG3LcSHwoWLSoJLct4ol0GBzXEEEWN9VhOS3eRXiNcnBs987nW3CQK8DXNqSu9f/BRwx30S6fZtBjjLd/Mn17KQDmRfa+zTm0iESszzT2iRxbVqxPWBayvHBTdapuEBT9YrfyYtiYIHFbdc1J8gxo= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Feb 27, 2023 at 01:49:27PM +0000, David Howells wrote: > Matthew Wilcox (Oracle) wrote: > > > POSIX requires that "If the file size is increased, the extended area > > shall appear as if it were zero-filled". It is possible to use mmap to > > write past EOF and that data will become visible instead of zeroes. > > > > Signed-off-by: Matthew Wilcox (Oracle) > > That seems to work. Do you want me to pass it on to Linus? If not: > > Acked-by: David Howells I'll send a patch series with all of this; it doesn't seem terribly urgent. Do you think there's a similar problem for AFS that Brian noted with the generic patch?