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Date:   Thu, 1 Jun 2023 09:27:57 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc:     Naohiro Aota <Naohiro.Aota@wdc.com>,
        Christoph Hellwig <hch@lst.de>,
        Johannes Thumshirn <Johannes.Thumshirn@wdc.com>,
        "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: new scrub code vs zoned file systems
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References: <821003e3-b457-90ba-e733-8c2fdd0c3b3c@wdc.com> <20230531133038.GA30855@lst.de> <a59b2274-9d64-f11e-f726-9283f560a495@wdc.com> <20230531141739.GA2160@lst.de> <134e56ed-1139-a71c-54d7-b4cbc27834a9@gmx.com> <20230601044034.GA21827@lst.de> <dcc61893-c48d-e8d9-3161-7f7b965b8e8b@gmx.com> <gn6vj3mlwsm53iu4ktso2dts4ifyxaky54ivb22laq3mqy27lv@guvvxohmkxy6> <mmttvfirtcp32ruvodutdw2vnvxqdnad2gywwb6jxl7gtkzqta@xw75lfxofsso> <37a62c6c-ca9a-a6d2-37ba-249605427d08@gmx.com>
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On Thu, Jun 01, 2023 at 03:21:22PM +0800, Qu Wenruo wrote:
> Is there any function that I can go to grab the current writer pointer?

You can get the information using blkdev_report_zones, or the
"blkzoned report" command from user space.