linux-kernel - RE: [PATCH RESEND v6 2/9] dax: Introduce holder for dax

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Date:   Tue, 17 Aug 2021 01:45:28 +0000
From:   "ruansy.fnst@...itsu.com" <ruansy.fnst@...itsu.com>
To:     Jane Chu <jane.chu@...cle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        "nvdimm@...ts.linux.dev" <nvdimm@...ts.linux.dev>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>
CC:     "djwong@...nel.org" <djwong@...nel.org>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "david@...morbit.com" <david@...morbit.com>,
        "hch@....de" <hch@....de>, "agk@...hat.com" <agk@...hat.com>,
        "snitzer@...hat.com" <snitzer@...hat.com>
Subject: RE: [PATCH RESEND v6 2/9] dax: Introduce holder for dax_device


> -----Original Message-----
> From: Jane Chu <jane.chu@...cle.com>
> Subject: Re: [PATCH RESEND v6 2/9] dax: Introduce holder for dax_device
> 
> 
> On 7/30/2021 3:01 AM, Shiyang Ruan wrote:
> > --- a/drivers/dax/super.c
> > +++ b/drivers/dax/super.c
> > @@ -214,6 +214,8 @@ enum dax_device_flags {
> >    * @cdev: optional character interface for "device dax"
> >    * @host: optional name for lookups where the device path is not available
> >    * @private: dax driver private data
> > + * @holder_rwsem: prevent unregistration while holder_ops is in progress
> > + * @holder_data: holder of a dax_device: could be filesystem or mapped
> device
> >    * @flags: state and boolean properties
> 
> Perhaps add two documentary lines for @ops and @holder_ops?

OK. I'll add them in next version.

--
Thanks,
Ruan.

> >    */
> >   struct dax_device {
> > @@ -222,8 +224,11 @@ struct dax_device {
> >   	struct cdev cdev;
> >   	const char *host;
> >   	void *private;
> > +	struct rw_semaphore holder_rwsem;
> > +	void *holder_data;
> >   	unsigned long flags;
> >   	const struct dax_operations *ops;
> > +	const struct dax_holder_operations *holder_ops;
> >   };
> 
> thanks,
> -jane