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

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Message-ID: <ZKRFSZQglwCba9/i@casper.infradead.org>
Date:   Tue, 4 Jul 2023 17:14:01 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Jan Kara <jack@...e.cz>, linux-block@...r.kernel.org,
        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>,
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        drbd-dev@...ts.linbit.com, Gao Xiang <xiang@...nel.org>,
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        jfs-discussion@...ts.sourceforge.net,
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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 Tue, Jul 04, 2023 at 07:06:26AM -0700, Bart Van Assche wrote:
> 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?

That is all in patch 0/32.  Why repeat it?