From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Tahsin Erdogan <tahsin@google.com>
Cc: Jan Kara <jack@suse.com>, "Theodore Ts'o" <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
Dave Kleikamp <shaggy@kernel.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Mark Fasheh <mfasheh@versity.com>,
Joel Becker <jlbec@evilplan.org>, Jens Axboe <axboe@fb.com>,
Deepa Dinamani <deepa.kernel@gmail.com>,
Mike Christie <mchristi@redhat.com>,
Fabian Frederick <fabf@skynet.be>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
jfs-discussion@lists.sourceforge.net,
linux-fsdevel@vger.kernel.org, ocfs2-devel@oss.oracle.com,
reiserfs-devel@vger.kernel.org
Subject: Re: [PATCH v2 27/28] ext4: xattr inode deduplication
Date: Fri, 2 Jun 2017 10:59:35 -0700 [thread overview]
Message-ID: <20170602175935.GB5626@birch.djwong.org> (raw)
In-Reply-To: <CAAeU0aN+Ts=SqGFEMOer=rguprDNX4Mo1Eyj+j1Y=dd-zdbkZw@mail.gmail.com>
On Fri, Jun 02, 2017 at 05:46:22AM -0700, Tahsin Erdogan wrote:
> > 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.
e2fsprogs already has code to walk the fs to rewrite/remove checksums,
so it shouldn't be too much effort to tap into that to rewrite the
ea_info hash.
> > 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.
--D
next prev parent reply other threads:[~2017-06-02 18:00 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-31 8:14 [PATCH 01/28] ext4: xattr-in-inode support Tahsin Erdogan
2017-05-31 8:14 ` [PATCH 02/28] ext4: fix lockdep warning about recursive inode locking Tahsin Erdogan
2017-05-31 8:14 ` [PATCH 03/28] ext4: lock inode before calling ext4_orphan_add() Tahsin Erdogan
2017-05-31 8:14 ` [PATCH 04/28] ext4: do not set posix acls on xattr inodes Tahsin Erdogan
2017-05-31 8:14 ` [PATCH 05/28] ext4: attach jinode after creation of xattr inode Tahsin Erdogan
2017-05-31 8:14 ` [PATCH 06/28] ext4: ea_inode owner should be the same as the inode owner Tahsin Erdogan
2017-05-31 8:14 ` [PATCH 07/28] ext4: call journal revoke when freeing ea_inode blocks Tahsin Erdogan
2017-05-31 16:12 ` Darrick J. Wong
2017-05-31 21:01 ` Tahsin Erdogan
2017-06-05 22:08 ` Andreas Dilger
2017-05-31 8:14 ` [PATCH 08/28] ext4: fix ref counting for ea_inode Tahsin Erdogan
2017-05-31 8:14 ` [PATCH 09/28] ext4: extended attribute value size limit is enforced by vfs Tahsin Erdogan
2017-05-31 16:03 ` Darrick J. Wong
2017-05-31 16:13 ` Tahsin Erdogan
2017-05-31 8:14 ` [PATCH 10/28] ext4: change ext4_xattr_inode_iget() signature Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 11/28] ext4: clean up ext4_xattr_inode_get() Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 12/28] ext4: add missing le32_to_cpu(e_value_inum) conversions Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 13/28] ext4: ext4_xattr_value_same() should return false for external data Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 14/28] ext4: fix ext4_xattr_make_inode_space() value size calculation Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 15/28] ext4: fix ext4_xattr_move_to_block() Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 16/28] ext4: fix ext4_xattr_cmp() Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 17/28] ext4: fix credits calculation for xattr inode Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 18/28] ext4: retry storing value in external inode with xattr block too Tahsin Erdogan
2017-06-20 8:56 ` [PATCH v2 18/31] " Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 19/28] ext4: ext4_xattr_delete_inode() should return accurate errors Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 20/28] ext4: improve journal credit handling in set xattr paths Tahsin Erdogan
2017-06-20 8:59 ` [PATCH v2 20/31] " Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 21/28] ext4: modify ext4_xattr_ino_array to hold struct inode * Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 22/28] ext4: move struct ext4_xattr_inode_array to xattr.h Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 23/28] mbcache: make mbcache more generic Tahsin Erdogan
2017-06-15 7:41 ` Jan Kara
2017-06-15 18:25 ` Tahsin Erdogan
2017-06-19 8:50 ` Jan Kara
2017-06-20 9:01 ` [PATCH v2 23/31] mbcache: make mbcache naming " Tahsin Erdogan
2017-06-21 17:43 ` Andreas Dilger
2017-06-21 18:33 ` Andreas Dilger
2017-06-21 21:39 ` Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 24/28] ext4: rename mb block cache functions Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 25/28] ext4: add ext4_is_quota_file() Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 26/28] ext4: cleanup transaction restarts during inode deletion Tahsin Erdogan
2017-06-14 14:17 ` [PATCH v2 " Tahsin Erdogan
2017-06-15 0:11 ` Andreas Dilger
2017-06-20 9:04 ` [PATCH v3 " Tahsin Erdogan
2017-06-20 9:29 ` Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 27/28] ext4: xattr inode deduplication Tahsin Erdogan
2017-05-31 15:40 ` kbuild test robot
2017-05-31 15:50 ` kbuild test robot
2017-05-31 16:00 ` Darrick J. Wong
2017-05-31 22:33 ` [PATCH v2 " Tahsin Erdogan
2017-06-02 5:41 ` Darrick J. Wong
2017-06-02 12:46 ` Tahsin Erdogan
2017-06-02 17:59 ` Darrick J. Wong [this message]
2017-06-02 23:35 ` [PATCH v3 " Tahsin Erdogan
2017-06-14 14:34 ` [PATCH v4 " Tahsin Erdogan
2017-05-31 8:15 ` [PATCH 28/28] quota: add extra inode count to dquot transfer functions Tahsin Erdogan
2017-06-15 7:57 ` Jan Kara
2017-06-17 1:50 ` Tahsin Erdogan
2017-06-19 9:03 ` Jan Kara
2017-06-19 11:46 ` Tahsin Erdogan
2017-06-19 12:36 ` Jan Kara
2017-06-20 9:12 ` [PATCH v2 28/31] quota: add get_inode_usage callback to transfer multi-inode charges Tahsin Erdogan
2017-06-20 12:01 ` Tahsin Erdogan
2017-06-20 15:28 ` Jan Kara
2017-06-20 18:08 ` [PATCH v3 " Tahsin Erdogan
2017-06-21 4:48 ` Theodore Ts'o
2017-06-21 11:22 ` Tahsin Erdogan
2017-06-20 9:53 ` [PATCH 28/28] quota: add extra inode count to dquot transfer functions Tahsin Erdogan
2017-05-31 16:42 ` [PATCH 01/28] ext4: xattr-in-inode support Darrick J. Wong
2017-05-31 19:59 ` Tahsin Erdogan
2017-06-01 15:50 ` [PATCH v2 " Tahsin Erdogan
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