linux-ext4 - Re: [PATCH 01/32] block: Provide blkdev_get_handle

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Message-ID: <bb91e76b-0bd8-a949-f8b9-868f919ebcb9@acm.org>
Date:   Tue, 4 Jul 2023 07:06:26 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Jan Kara <jack@...e.cz>, linux-block@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        Alasdair Kergon <agk@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anna Schumaker <anna@...nel.org>, Chao Yu <chao@...nel.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Dave Kleikamp <shaggy@...nel.org>,
        David Sterba <dsterba@...e.com>, dm-devel@...hat.com,
        drbd-dev@...ts.linbit.com, Gao Xiang <xiang@...nel.org>,
        Jack Wang <jinpu.wang@...os.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        jfs-discussion@...ts.sourceforge.net,
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        Joseph Qi <joseph.qi@...ux.alibaba.com>,
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        Trond Myklebust <trond.myklebust@...merspace.com>,
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Subject: Re: [PATCH 01/32] block: Provide blkdev_get_handle_* functions

On 7/4/23 05:21, Jan Kara wrote:
> +struct bdev_handle {
> +	struct block_device *bdev;
> +	void *holder;
> +};

Please explain in the patch description why a holder pointer is 
introduced in struct bdev_handle and how it relates to the bd_holder 
pointer in struct block_device. Is one of the purposes of this patch 
series perhaps to add support for multiple holders per block device?

Thanks,

Bart.