linux-kernel - Re: [resend v1 1/5] block/genhd: Notify udev about capacity change

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Date:   Tue, 7 Jan 2020 22:30:30 +0000
From:   "Singh, Balbir" <sblbir@...zon.com>
To:     "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "Sangaraju, Someswarudu" <ssomesh@...zon.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "hch@....de" <hch@....de>, "axboe@...nel.dk" <axboe@...nel.dk>,
        "mst@...hat.com" <mst@...hat.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "Chaitanya.Kulkarni@....com" <Chaitanya.Kulkarni@....com>
Subject: Re: [resend v1 1/5] block/genhd: Notify udev about capacity change

On Mon, 2020-01-06 at 22:32 -0500, Martin K. Petersen wrote:
> Hi Balbir,
> 
> > Allow block/genhd to notify user space (via udev) about disk size
> > changes using a new helper disk_set_capacity(), which is a wrapper on
> > top of set_capacity(). disk_set_capacity() will only notify via udev
> > if the current capacity or the target capacity is not zero.
> 
> I know set_capacity() is called all over the place making it a bit of a
> pain to audit. Is that the reason you introduced a new function instead
> of just emitting the event in set_capacity()?
> 

I did this to avoid having to enforce that set_capacity() implied a
notification. Largely to control the impact of the change by default.

Balbir Singh.