From: Christoph Hellwig <hch@infradead.org>
To: Christian Brauner <brauner@kernel.org>
Cc: Jan Kara <jack@suse.cz>,
linux-fsdevel@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
James Bottomley <James.Bottomley@hansenpartnership.com>,
mcgrof@kernel.org, hch@infradead.org, david@fromorbit.com,
rafael@kernel.org, djwong@kernel.org, pavel@kernel.org,
peterz@infradead.org, mingo@redhat.com, will@kernel.org,
boqun.feng@gmail.com
Subject: Re: [PATCH] fs: allow nesting with FREEZE_EXCL
Date: Mon, 7 Apr 2025 02:08:54 -0700 [thread overview]
Message-ID: <Z_OWJqiOyVPWGq1a@infradead.org> (raw)
In-Reply-To: <20250404-work-freeze-v1-1-31f9a26f7bc9@kernel.org>
On Fri, Apr 04, 2025 at 12:24:09PM +0200, Christian Brauner wrote:
> If hibernation races with filesystem freezing (e.g. DM reconfiguration),
> then hibernation need not freeze a filesystem because it's already
> frozen but userspace may thaw the filesystem before hibernation actually
> happens.
>
> If the race happens the other way around, DM reconfiguration may
> unexpectedly fail with EBUSY.
>
> So allow FREEZE_EXCL to nest with other holders. An exclusive freezer
> cannot be undone by any of the other concurrent freezers.
What is FREEZE_EXCL? I can't find it anywhere including in linux-next.
next prev parent reply other threads:[~2025-04-07 9:08 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20250329-work-freeze-v2-0-a47af37ecc3d@kernel.org>
2025-03-31 12:42 ` [PATCH 0/2] efivarfs: support freeze/thaw Christian Brauner
2025-03-31 12:42 ` [PATCH 1/2] libfs: export find_next_child() Christian Brauner
2025-03-31 12:42 ` [PATCH 2/2] efivarfs: support freeze/thaw Christian Brauner
2025-03-31 14:46 ` James Bottomley
2025-03-31 15:03 ` Christian Brauner
2025-04-01 19:31 ` James Bottomley
2025-04-02 7:44 ` Christian Brauner
2025-03-31 14:05 ` [PATCH 0/2] " Ard Biesheuvel
2025-04-01 0:32 ` [PATCH 0/6] power: wire-up filesystem freeze/thaw with suspend/resume Christian Brauner
2025-04-01 0:32 ` [PATCH 1/6] ext4: replace kthread freezing with auto fs freezing Christian Brauner
2025-04-01 9:16 ` Jan Kara
2025-04-01 9:35 ` Christian Brauner
2025-04-01 10:08 ` Jan Kara
2025-04-01 0:32 ` [PATCH 2/6] btrfs: " Christian Brauner
2025-04-01 0:32 ` [PATCH 3/6] xfs: " Christian Brauner
2025-04-01 1:11 ` Dave Chinner
2025-04-01 7:17 ` Christian Brauner
2025-04-01 11:35 ` Dave Chinner
2025-04-01 12:45 ` Christian Brauner
2025-04-01 0:32 ` [PATCH 4/6] fs: add owner of freeze/thaw Christian Brauner
2025-04-01 0:32 ` [PATCH 5/6] fs: allow pagefault based writers to be frozen Christian Brauner
2025-04-01 0:32 ` [PATCH 6/6] power: freeze filesystems during suspend/resume Christian Brauner
2025-04-01 8:16 ` [PATCH 0/6] power: wire-up filesystem freeze/thaw with suspend/resume Christian Brauner
2025-04-01 9:32 ` Jan Kara
2025-04-01 13:03 ` Christian Brauner
2025-04-01 16:57 ` Jan Kara
2025-04-02 14:07 ` [PATCH v2 0/4] " Christian Brauner
2025-04-02 14:07 ` [PATCH v2 1/4] fs: add owner of freeze/thaw Christian Brauner
2025-04-03 14:56 ` Jan Kara
2025-04-03 19:33 ` Christian Brauner
2025-04-04 10:24 ` [PATCH] fs: allow nesting with FREEZE_EXCL Christian Brauner
2025-04-07 9:08 ` Christoph Hellwig [this message]
2025-05-07 11:18 ` Jan Kara
2025-05-09 10:38 ` Christian Brauner
2025-04-02 14:07 ` [PATCH v2 2/4] fs: allow all writers to be frozen Christian Brauner
2025-04-02 15:32 ` Christian Brauner
2025-04-02 16:03 ` James Bottomley
2025-04-02 16:13 ` Christian Brauner
2025-04-03 14:59 ` Jan Kara
2025-04-02 14:07 ` [PATCH v2 3/4] power: freeze filesystems during suspend/resume Christian Brauner
2025-04-03 16:29 ` Jan Kara
2025-04-02 14:07 ` [PATCH v2 4/4] kernfs: add warning about implementing freeze/thaw Christian Brauner
2025-04-03 15:00 ` Jan Kara
2025-07-20 19:23 ` [PATCH v2 0/4] power: wire-up filesystem freeze/thaw with suspend/resume Askar Safin
2025-07-21 12:09 ` Jan Kara
2025-08-04 5:31 ` Miklos Szeredi
2025-08-04 6:02 ` Askar Safin
2025-08-04 6:51 ` Sergey Senozhatsky
2025-04-01 14:14 ` [PATCH 0/6] " Peter Zijlstra
2025-04-01 14:40 ` Christian Brauner
2025-04-01 14:59 ` Peter Zijlstra
2025-04-01 17:02 ` James Bottomley
2025-04-02 7:46 ` Christian Brauner
2025-04-08 15:43 ` James Bottomley
2025-04-08 17:09 ` Luis Chamberlain
2025-04-08 17:20 ` Luis Chamberlain
2025-04-08 17:26 ` James Bottomley
2025-04-08 17:24 ` James Bottomley
2025-04-09 7:17 ` Christian Brauner
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