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From: David Sterba <dsterba@suse.cz>
To: Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc: dsterba@suse.cz, Qu Wenruo <wqu@suse.com>, linux-btrfs@vger.kernel.org
Subject: Re: [PATCH v2 0/7] btrfs-progs: Support for BG_TREE feature
Date: Wed, 16 Oct 2019 13:16:05 +0200
Message-ID: <20191016111605.GB2751@twin.jikos.cz> (raw)
In-Reply-To: <1d23e48d-8908-5e1c-0c56-7b6ccaef5d27@gmx.com>

On Tue, Oct 15, 2019 at 08:32:30AM +0800, Qu Wenruo wrote:
> > Have we settled the argument whether to use a new tree or key tricks for
> > the blocgroup data? I think we have not and will read the previous
> > discussions. For a feature like this I want to be sure we understand all
> > the pros and cons.
> > 
> Yep, we haven't settled on the whether creating a new tree, or
> re-organize the keys.
> 
> But as my last discussion said, I see no obvious pro using the existing
> extent tree to hold the new block group item keys, even we can pack them
> all together.

For me the obvious pro is minimum change to existing set of trees.

> And for backup roots, indeed I forgot to add this feature.
> But to me that's a minor point, not a show stopper.
>
> The most important aspect to me is, to allow real world user of super
> large fs to try this feature, to prove the usefulness of this design,
> other than my on-paper analyse.
> 
> That's why I'm pushing the patchset, even it may not pass any review.
> I just want to hold a up-to-date branch so that when some one needs, it
> can grab and try them themselves.

Ok that's fine and I can add the branch to for-next for ease of testing.
I'm working on a prototype that does it the bg item key way, it compiles
and creates almost correct filesystem, so I have to fix it before
posting. The patches are on top of your bg-tree feature so we could have
both in the same kernel for testing.

  reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-08  4:49 Qu Wenruo
2019-10-08  4:49 ` [PATCH v2 1/7] btrfs-progs: Refactor excluded extent functions to use fs_info Qu Wenruo
2019-10-08  9:22   ` Johannes Thumshirn
2019-10-17  2:16   ` Anand Jain
2019-10-08  4:49 ` [PATCH v2 2/7] btrfs-progs: Refactor btrfs_read_block_groups() Qu Wenruo
2019-10-17  3:23   ` Anand Jain
2019-10-17  4:33     ` Qu Wenruo
2019-10-17  5:08       ` Anand Jain
2019-10-08  4:49 ` [PATCH v2 3/7] btrfs-progs: Enable read-write ability for 'bg_tree' feature Qu Wenruo
2019-10-17  4:56   ` Anand Jain
2019-10-08  4:49 ` [PATCH v2 4/7] btrfs-progs: mkfs: Introduce -O bg-tree Qu Wenruo
2019-10-08  8:16   ` [PATCH v2.1 " Qu Wenruo
2019-10-08  4:49 ` [PATCH v2 5/7] btrfs-progs: dump-tree/dump-super: Introduce support for bg tree Qu Wenruo
2019-10-08  4:49 ` [PATCH v2 6/7] btrfs-progs: check: Introduce support for bg-tree feature Qu Wenruo
2019-10-08  4:49 ` [PATCH v2 7/7] btrfs-progs: btrfstune: Allow to enable bg-tree feature offline Qu Wenruo
2019-10-17  4:17   ` Anand Jain
2019-10-17  4:28     ` Qu Wenruo
2019-10-14 15:17 ` [PATCH v2 0/7] btrfs-progs: Support for BG_TREE feature David Sterba
2019-10-15  0:32   ` Qu Wenruo
2019-10-16 11:16     ` David Sterba [this message]
2019-10-16 11:19       ` Qu WenRuo
2019-10-18 17:27         ` David Sterba
2019-10-19  0:04           ` Qu Wenruo
2019-10-21 15:44             ` David Sterba
2019-10-22  0:49               ` Qu Wenruo
2019-10-22  6:30                 ` Qu Wenruo
2019-10-22 12:23                   ` David Sterba
2019-10-22 12:27                     ` Qu Wenruo

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