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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" <linux-btrfs@vger.kernel.org>
Subject: Re: [PATCH v2 0/7] btrfs-progs: Support for BG_TREE feature
Date: Tue, 22 Oct 2019 14:23:48 +0200
Message-ID: <20191022122348.GV3001@twin.jikos.cz> (raw)
In-Reply-To: <7435bf0f-ffbc-6723-4383-d780522d5af8@gmx.com>

On Tue, Oct 22, 2019 at 02:30:22PM +0800, Qu Wenruo wrote:
> BTW, there is one important compatibility problem related to all the BGI
> related features.
> 
> Although I'm putting the BG_TREE feature as incompatible feature, but in
> theory, it should be RO compatible.

It could be RO compatible yes.

> As except extent/bg tree, we *should* read the fs without any problem.
> 
> But the problem is, current btrfs mount (including btrfs-check) still
> need to go through the block group item search, even for permanent RO mount.
> 
> This get my rescue mount option patchset to be involved.
> If we have such skip_bg feature earlier, we can completely afford to
> make all these potential features as RO compatible.
> 
> 
> Now my question is,  should we put this feature still as incompatible
> feature?

In some way it would probably have to be incompat, either full or RO. As
unknown tree items are ignored, if the rest of the filesystem provides
enough information to access the data, then incompat RO sounds like the
best option. And that's probably independent of how exactly the new BGI
is done.

  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
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 [this message]
2019-10-22 12:27                     ` Qu Wenruo

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