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

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Date:   Tue, 07 Jan 2020 22:15:00 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     "Singh\, Balbir" <sblbir@...zon.com>
Cc:     "martin.petersen\@oracle.com" <martin.petersen@...cle.com>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block\@vger.kernel.org" <linux-block@...r.kernel.org>,
        "Sangaraju\, Someswarudu" <ssomesh@...zon.com>,
        "jejb\@linux.ibm.com" <jejb@...ux.ibm.com>,
        "hch\@lst.de" <hch@....de>, "axboe\@kernel.dk" <axboe@...nel.dk>,
        "mst\@redhat.com" <mst@...hat.com>,
        "linux-nvme\@lists.infradead.org" <linux-nvme@...ts.infradead.org>,
        "Chaitanya.Kulkarni\@wdc.com" <Chaitanya.Kulkarni@....com>
Subject: Re: [resend v1 5/5] drivers/scsi/sd.c: Convert to use disk_set_capacity


Balbir,

>> We already emit an SDEV_EVT_CAPACITY_CHANGE_REPORTED event if device
>> capacity changes. However, this event does not automatically cause
>> revalidation.
>
> The proposed idea is to not reinforce revalidation, unless explictly
> specified (in the thread before Bob Liu had suggestions). The goal is
> to notify user space of changes via RESIZE. SCSI sd can opt out of
> this IOW, I can remove this if you feel
> SDEV_EVT_CAPACITY_CHANGE_REPORTED is sufficient for current use cases.

I have no particular objection to the code change. I was just observing
that in the context of sd.c, RESIZE=1 is more of a "your request to
resize was successful" notification due to the requirement of an
explicit userland action in case a device reports a capacity change.

-- 
Martin K. Petersen	Oracle Linux Engineering