linux-kernel - Re: [resend v1 4/5] drivers/nvme/host/core.c: Convert to use disk_set

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Date:   Sat, 4 Jan 2020 22:27:39 +0000
From:   Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
To:     Balbir Singh <sblbir@...zon.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
CC:     "axboe@...nel.dk" <axboe@...nel.dk>,
        "ssomesh@...zon.com" <ssomesh@...zon.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "hch@....de" <hch@....de>, "mst@...hat.com" <mst@...hat.com>
Subject: Re: [resend v1 4/5] drivers/nvme/host/core.c: Convert to use
 disk_set_capacity

Quick question here if user executes nvme ns-rescan /dev/nvme1
will following code result in triggering uevent(s) for
the namespace(s( for which there is no change in the size ?

If so is that an expected behavior ?

On 01/01/2020 11:54 PM, Balbir Singh wrote:
> block/genhd provides disk_set_capacity() for sending
> RESIZE notifications via uevents. This notification is
> newly added to NVME devices
>
> Signed-off-by: Balbir Singh <sblbir@...zon.com>
> ---
>   drivers/nvme/host/core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 667f18f465be..cb214e914fc2 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -1808,7 +1808,7 @@ static void nvme_update_disk_info(struct gendisk *disk,
>   	    ns->lba_shift > PAGE_SHIFT)
>   		capacity = 0;
>
> -	set_capacity(disk, capacity);
> +	disk_set_capacity(disk, capacity);
>
>   	nvme_config_discard(disk, ns);
>   	nvme_config_write_zeroes(disk, ns);
>