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: 121+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-27 14:06 [RFC PATCH 0/4] vfs freeze/thaw on suspend/resume James Bottomley
2025-03-27 14:06 ` [RFC PATCH 1/4] locking/percpu-rwsem: add freezable alternative to down_read James Bottomley
2025-03-31 19:51 ` James Bottomley
2025-03-31 23:32 ` Christian Brauner
2025-04-01 1:13 ` James Bottomley
2025-04-01 11:20 ` Jan Kara
2025-04-01 12:50 ` Christian Brauner
2025-04-01 12:52 ` James Bottomley
2025-04-02 11:47 ` Jan Kara
2025-03-27 14:06 ` [RFC PATCH 2/4] vfs: make sb_start_write freezable James Bottomley
2025-03-27 17:36 ` Jan Kara
2025-03-27 14:06 ` [RFC PATCH 3/4] fs/super.c: introduce reverse superblock iterator and use it in emergency remount James Bottomley
2025-03-28 11:56 ` Christian Brauner
2025-03-28 12:38 ` James Bottomley
2025-03-28 16:15 ` [PATCH 0/6] Extend freeze support to suspend and hibernate Christian Brauner
2025-03-28 16:15 ` [PATCH 1/6] super: remove pointless s_root checks Christian Brauner
2025-03-28 16:15 ` [PATCH 2/6] super: simplify user_get_super() Christian Brauner
2025-03-28 16:15 ` [PATCH 3/6] super: skip dying superblocks early Christian Brauner
2025-03-28 16:15 ` [PATCH 4/6] super: use a common iterator (Part 1) Christian Brauner
2025-03-28 16:15 ` [PATCH 5/6] super: use common iterator (Part 2) Christian Brauner
2025-03-28 18:58 ` James Bottomley
2025-03-29 7:34 ` Christian Brauner
2025-03-28 16:15 ` [PATCH 6/6] super: add filesystem freezing helpers for suspend and hibernate Christian Brauner
2025-03-29 8:42 ` [PATCH v2 0/6] Extend freeze support to " Christian Brauner
2025-03-29 8:42 ` [PATCH v2 1/6] super: remove pointless s_root checks Christian Brauner
2025-03-31 9:57 ` Jan Kara
2025-06-11 16:26 ` Darrick J. Wong
2025-06-12 12:20 ` Christian Brauner
2025-03-29 8:42 ` [PATCH v2 2/6] super: simplify user_get_super() Christian Brauner
2025-03-31 9:58 ` Jan Kara
2025-03-29 8:42 ` [PATCH v2 3/6] super: skip dying superblocks early Christian Brauner
2025-03-31 10:00 ` Jan Kara
2025-03-29 8:42 ` [PATCH v2 4/6] super: use a common iterator (Part 1) Christian Brauner
2025-03-31 10:01 ` Jan Kara
2025-03-29 8:42 ` [PATCH v2 5/6] super: use common iterator (Part 2) Christian Brauner
2025-03-31 10:07 ` Jan Kara
2025-03-31 10:15 ` Christian Brauner
2025-03-29 8:42 ` [PATCH v2 6/6] super: add filesystem freezing helpers for suspend and hibernate Christian Brauner
2025-03-29 8:46 ` Christian Brauner
2025-03-29 11:30 ` kernel test robot
2025-03-31 10:23 ` Jan Kara
2025-03-31 10:25 ` Christian Brauner
2025-03-29 14:04 ` [PATCH v2 0/6] Extend freeze support to " James Bottomley
2025-03-29 17:02 ` James Bottomley
2025-03-30 8:33 ` Christian Brauner
2025-03-30 11:53 ` Christian Brauner
2025-03-30 14:00 ` James Bottomley
2025-03-31 9:13 ` Christian Brauner
2025-03-31 10:36 ` Jan Kara
2025-03-31 14:49 ` James Bottomley
2025-03-31 23:33 ` Christian Brauner
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
2025-03-27 14:06 ` [RFC PATCH 4/4] vfs: add filesystem freeze/thaw callbacks for power management James Bottomley
2025-03-27 18:20 ` Jan Kara
2025-03-28 14:21 ` James Bottomley
2025-03-28 14:36 ` James Bottomley
2025-03-28 10:08 ` Christian Brauner
2025-03-28 14:14 ` James Bottomley
2025-03-28 15:52 ` Christian Brauner
2025-03-28 16:15 ` James Bottomley
2025-03-29 8:23 ` Christian Brauner
2025-03-28 12:01 ` Christian Brauner
2025-03-28 14:40 ` James Bottomley
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Z_OWJqiOyVPWGq1a@infradead.org \
--to=hch@infradead.org \
--cc=James.Bottomley@hansenpartnership.com \
--cc=ardb@kernel.org \
--cc=boqun.feng@gmail.com \
--cc=brauner@kernel.org \
--cc=david@fromorbit.com \
--cc=djwong@kernel.org \
--cc=jack@suse.cz \
--cc=linux-efi@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mcgrof@kernel.org \
--cc=mingo@redhat.com \
--cc=pavel@kernel.org \
--cc=peterz@infradead.org \
--cc=rafael@kernel.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.