From: Christian Brauner <brauner@kernel.org>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net, Jan Kara <jack@suse.cz>,
linux-fsdevel@vger.kernel.org, Josef Bacik <josef@toxicpanda.com>,
Ryusuke Konishi <konishi.ryusuke@gmail.com>,
linux-xfs@vger.kernel.org, Chris Mason <clm@fb.com>,
linux-nilfs@vger.kernel.org,
Andreas Dilger <adilger.kernel@dilger.ca>,
Al Viro <viro@zeniv.linux.org.uk>,
Jaegeuk Kim <jaegeuk@kernel.org>, David Sterba <dsterba@suse.com>,
Theodore Ts'o <tytso@mit.edu>,
linux-ext4@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
linux-btrfs@vger.kernel.org
Subject: Re: [f2fs-dev] [PATCH 11/12] xfs: drop s_umount over opening the log and RT devices
Date: Sat, 5 Aug 2023 19:13:13 +0200 [thread overview]
Message-ID: <20230805-langzeitfolgen-notation-dfd8a0175060@brauner> (raw)
In-Reply-To: <20230805161904.GM11377@frogsfrogsfrogs>
On Sat, Aug 05, 2023 at 09:19:04AM -0700, Darrick J. Wong wrote:
> On Sat, Aug 05, 2023 at 10:32:39AM +0200, Christoph Hellwig wrote:
> > On Wed, Aug 02, 2023 at 09:32:19AM -0700, Darrick J. Wong wrote:
> > > > + /* see get_tree_bdev why this is needed and safe */
> > >
> > > Which part of get_tree_bdev? Is it this?
> > >
> > > /*
> > > * s_umount nests inside open_mutex during
> > > * __invalidate_device(). blkdev_put() acquires
> > > * open_mutex and can't be called under s_umount. Drop
> > > * s_umount temporarily. This is safe as we're
> > > * holding an active reference.
> > > */
> > > up_write(&s->s_umount);
> > > blkdev_put(bdev, fc->fs_type);
> > > down_write(&s->s_umount);
> >
> > Yes. With the refactoring earlier in the series get_tree_bdev should
> > be trivial enough to not need a more specific reference. If you
> > think there's a better way to refer to it I can update the comment,
> > though.
>
> How about:
>
> /*
> * blkdev_put can't be called under s_umount, see the comment in
> * get_tree_bdev for more details
> */
>
> with that and the label name change,
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Added that comment and you rvb in-tree.
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next prev parent reply other threads:[~2023-08-05 17:13 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-02 15:41 [f2fs-dev] more blkdev_get and holder work Christoph Hellwig
2023-08-02 15:41 ` [f2fs-dev] [PATCH 01/12] fs: export setup_bdev_super Christoph Hellwig
2023-08-03 18:04 ` Christian Brauner
2023-09-04 18:11 ` patchwork-bot+f2fs
2023-08-02 15:41 ` [f2fs-dev] [PATCH 02/12] nilfs2: use setup_bdev_super to de-duplicate the mount code Christoph Hellwig
2023-08-03 11:46 ` Jan Kara
2023-08-04 2:01 ` Ryusuke Konishi
2023-08-10 11:05 ` Jan Kara
2023-08-10 16:39 ` Ryusuke Konishi
2023-08-10 18:14 ` Jan Kara
2023-08-04 5:04 ` Ryusuke Konishi
2023-08-02 15:41 ` [f2fs-dev] [PATCH 03/12] btrfs: always open the device read-only in btrfs_scan_one_device Christoph Hellwig
2023-08-02 15:41 ` [f2fs-dev] [PATCH 04/12] btrfs: open block devices after superblock creation Christoph Hellwig
2023-08-02 15:41 ` [f2fs-dev] [PATCH 05/12] ext4: make the IS_EXT2_SB/IS_EXT3_SB checks more robust Christoph Hellwig
2023-08-03 11:21 ` Jan Kara
2023-08-03 18:10 ` Christian Brauner
2023-08-04 20:34 ` Theodore Ts'o
2023-08-02 15:41 ` [f2fs-dev] [PATCH 06/12] fs: use the super_block as holder when mounting file systems Christoph Hellwig
2023-08-03 11:51 ` Jan Kara
2023-08-03 13:33 ` Jan Kara
2023-08-05 8:36 ` Christoph Hellwig
2023-08-03 18:11 ` Christian Brauner
2023-08-02 15:41 ` [f2fs-dev] [PATCH 07/12] fs: stop using get_super in fs_mark_dead Christoph Hellwig
2023-08-03 13:12 ` Jan Kara
2023-08-03 18:15 ` Christian Brauner
2023-08-02 15:41 ` [f2fs-dev] [PATCH 08/12] fs: export fs_holder_ops Christoph Hellwig
2023-08-03 13:16 ` Jan Kara
2023-08-03 18:15 ` Christian Brauner
2023-08-02 15:41 ` [f2fs-dev] [PATCH 09/12] ext4: drop s_umount over opening the log device Christoph Hellwig
2023-08-03 13:25 ` Jan Kara
2023-08-03 18:16 ` Christian Brauner
2023-08-04 20:34 ` Theodore Ts'o
2023-08-02 15:41 ` [f2fs-dev] [PATCH 10/12] ext4: use fs_holder_ops for " Christoph Hellwig
2023-08-03 13:26 ` Jan Kara
2023-08-02 15:41 ` [f2fs-dev] [PATCH 11/12] xfs: drop s_umount over opening the log and RT devices Christoph Hellwig
2023-08-02 16:32 ` Darrick J. Wong
2023-08-05 8:32 ` Christoph Hellwig
2023-08-05 10:39 ` Christian Brauner
2023-08-05 16:19 ` Darrick J. Wong
2023-08-05 17:13 ` Christian Brauner [this message]
2023-08-02 15:41 ` [f2fs-dev] [PATCH 12/12] xfs use fs_holder_ops for " Christoph Hellwig
2023-08-02 16:33 ` Darrick J. Wong
2023-08-14 10:58 ` Carlos Maiolino
2023-08-14 11:05 ` Carlos Maiolino
2023-08-04 15:39 ` [f2fs-dev] more blkdev_get and holder work Christian Brauner
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