linux-kernel - RE: [PATCH v2 1/2] block: add sync_blockdev

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Date:   Wed, 6 Apr 2022 10:21:15 +0000
From:   "Yuezhang.Mo@...y.com" <Yuezhang.Mo@...y.com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     Namjae Jeon <linkinjeon@...nel.org>,
        "sj1557.seo@...sung.com" <sj1557.seo@...sung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "Andy.Wu@...y.com" <Andy.Wu@...y.com>,
        "Wataru.Aoyama@...y.com" <Wataru.Aoyama@...y.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>
Subject: RE: [PATCH v2 1/2] block: add sync_blockdev_range()

> From: Christoph Hellwig <hch@...radead.org>
> > --- a/block/bdev.c
> > +++ b/block/bdev.c
> > @@ -200,6 +200,16 @@ int sync_blockdev(struct block_device *bdev)  }
> > EXPORT_SYMBOL(sync_blockdev);
> >
> > +int sync_blockdev_range(struct block_device *bdev, loff_t lstart,
> > +loff_t lend) {
> > +	if (!bdev)
> > +		return 0;
> 
> This check isn't really needed, and I don't think we need a !CONFIG_BLOCK
> stub for this either.

sync_blockdev() and related helpers have this check and a !CONFIG_BLOCK stub.
I would like to understand the background of your comment, could you explain a little more?

Thanks.