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Message-ID: <CAAeU0aN+Ts=SqGFEMOer=rguprDNX4Mo1Eyj+j1Y=dd-zdbkZw@mail.gmail.com> Date: Fri, 2 Jun 2017 05:46:22 -0700 From: Tahsin Erdogan <tahsin@...gle.com> To: "Darrick J. Wong" <darrick.wong@...cle.com> Cc: Jan Kara <jack@...e.com>, "Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, Dave Kleikamp <shaggy@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, Mark Fasheh <mfasheh@...sity.com>, Joel Becker <jlbec@...lplan.org>, Jens Axboe <axboe@...com>, Deepa Dinamani <deepa.kernel@...il.com>, Mike Christie <mchristi@...hat.com>, Fabian Frederick <fabf@...net.be>, linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, jfs-discussion@...ts.sourceforge.net, linux-fsdevel@...r.kernel.org, ocfs2-devel@....oracle.com, reiserfs-devel@...r.kernel.org Subject: Re: [PATCH v2 27/28] ext4: xattr inode deduplication > Hmm... normally we'd supply sbi->s_csum_seed as the second argument so > that the metadata checksum value also has the fs uuid stamped into it. I have thought about using sbi->s_csum_seed and was a little hesitant because it involves adding more complexity to e2fsprogs to handle cases like changing uuid or turning off metadata_csum. After thinking more about this, I think it is doable. > Even if you dismiss that, we usually follow the convention of > initializing the crc32c calculation with (~0U), not (0U), to strengthen > crc32c's ability to detect zeroes being injected at the start of the > stream. Agreed, using ~0 is definitely better than 0.
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