From: Qu Wenruo <quwenruo.btrfs@gmx.com>
To: Josef Bacik <josef@toxicpanda.com>, Qu Wenruo <wqu@suse.com>,
linux-btrfs@vger.kernel.org
Subject: Re: [PATCH 2/4] btrfs: detect uninitialized btrfs_root::anon_dev for user visible subvolumes
Date: Wed, 17 Jun 2020 06:49:45 +0800 [thread overview]
Message-ID: <f1f940ba-3f1d-302a-0d28-5620286bcdc0@gmx.com> (raw)
In-Reply-To: <d17609b5-ac29-937c-763d-fc978e3f1bad@toxicpanda.com>
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On 2020/6/17 上午3:25, Josef Bacik wrote:
> On 6/15/20 10:17 PM, Qu Wenruo wrote:
>> btrfs_root::anon_dev is an indicator for different subvolume namespaces.
>> Thus it should always be initialized to an anonymous block device.
>>
>> Add a safe net to catch such uninitialized values.
>>
>> Signed-off-by: Qu Wenruo <wqu@suse.com>
>
> Can we handle stat->dev not having a device set? Or will this blow up
> in other ways? Thanks,
We can handle it without any problem, just users get confused.
As a common practice, we use different bdev as a namespace for different
subvolumes.
Without a valid bdev, some user space tools may not be able to
distinguish inodes in different subvolumes.
Thanks,
Qu
>
> Josef
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next prev parent reply other threads:[~2020-06-16 22:49 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 2:17 [PATCH 0/4] btrfs: workaround exhausted anonymous block device pool Qu Wenruo
2020-06-16 2:17 ` [PATCH 1/4] btrfs: disk-io: don't allocate anonymous block device for user invisible roots Qu Wenruo
2020-06-16 19:21 ` Josef Bacik
2020-06-16 2:17 ` [PATCH 2/4] btrfs: detect uninitialized btrfs_root::anon_dev for user visible subvolumes Qu Wenruo
2020-06-16 19:25 ` Josef Bacik
2020-06-16 22:49 ` Qu Wenruo [this message]
2020-06-16 23:32 ` Josef Bacik
2020-06-16 23:49 ` Qu Wenruo
2020-06-17 11:31 ` David Sterba
2020-06-17 13:37 ` Josef Bacik
2020-06-17 23:39 ` Qu Wenruo
2020-06-16 2:17 ` [PATCH 3/4] btrfs: preallocate anon_dev for subvolume and snapshot creation Qu Wenruo
2020-06-16 15:10 ` David Sterba
2020-06-16 22:54 ` Qu Wenruo
2020-07-01 3:25 ` Qu Wenruo
2020-07-01 17:39 ` David Sterba
2020-07-01 23:56 ` Qu Wenruo
2020-07-02 16:08 ` David Sterba
2020-07-02 23:46 ` David Sterba
2020-07-03 5:19 ` Qu Wenruo
2020-07-03 12:29 ` David Sterba
2020-07-03 12:39 ` Qu Wenruo
2020-06-16 2:17 ` [PATCH 4/4] btrfs: free anon_dev earlier to prevent exhausting anonymous block device pool Qu Wenruo
2020-06-16 19:23 ` Josef Bacik
2020-06-16 22:48 ` David Sterba
2020-06-16 23:31 ` Josef Bacik
2020-06-30 14:14 ` [PATCH 0/4] btrfs: workaround exhausted " David Sterba
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