linux-kernel - Re: [PATCH RFC v2 for-6.8/block 17/18] ext4: remove block_device

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Date:   Mon, 11 Dec 2023 18:04:03 +0100
From:   Jan Kara <jack@...e.cz>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     axboe@...nel.dk, roger.pau@...rix.com, colyli@...e.de,
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Subject: Re: [PATCH RFC v2 for-6.8/block 17/18] ext4: remove
 block_device_ejected()

On Mon 11-12-23 22:08:33, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> block_device_ejected() is added by commit bdfe0cbd746a ("Revert
> "ext4: remove block_device_ejected"") in 2015. At that time 'bdi->wb'
> is destroyed synchronized from del_gendisk(), hence if ext4 is still
> mounted, and then mark_buffer_dirty() will reference destroyed 'wb'.
> However, such problem doesn't exist anymore:
> 
> - commit d03f6cdc1fc4 ("block: Dynamically allocate and refcount
> backing_dev_info") switch bdi to use refcounting;
> - commit 13eec2363ef0 ("fs: Get proper reference for s_bdi"), will grab
> additional reference of bdi while mounting, so that 'bdi->wb' will not
> be destroyed until generic_shutdown_super().
> 
> Hence remove this dead function block_device_ejected().
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

Agreed, this should not be needed anymore. We'll see whether this is true
also in practice :). Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR