linux-kernel - Re: [resend v1 5/5] drivers/scsi/sd.c: Convert to use disk_set

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Date:   Wed, 8 Jan 2020 16:06:12 +0100
From:   Christoph Hellwig <hch@....de>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Balbir Singh <sblbir@...zon.com>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
        axboe@...nel.dk, ssomesh@...zon.com, jejb@...ux.ibm.com,
        hch@....de, mst@...hat.com, Chaitanya.Kulkarni@....com
Subject: Re: [resend v1 5/5] drivers/scsi/sd.c: Convert to use
 disk_set_capacity

On Mon, Jan 06, 2020 at 10:48:30PM -0500, Martin K. Petersen wrote:
> 
> Balbir,
> 
> > diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> > index 5afb0046b12a..1a3be30b6b78 100644
> > --- a/drivers/scsi/sd.c
> > +++ b/drivers/scsi/sd.c
> > @@ -3184,7 +3184,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
> >  
> >  	sdkp->first_scan = 0;
> >  
> > -	set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
> > +	disk_set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
> >  	sd_config_write_same(sdkp);
> >  	kfree(buffer);
> 
> We already emit an SDEV_EVT_CAPACITY_CHANGE_REPORTED event if device
> capacity changes. However, this event does not automatically cause
> revalidation.

Who is looking at these sdev specific events?  (And who is looking
at the virtio/xenblk ones?)  It  makes a lot of sense to have one event
supported by all devices.  But don't ask me which one would be the best..