linux-kernel - Re: [PATCH 08/10] block: nvme: use blk_is_valid_logical_block

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Date:   Tue, 21 Jul 2020 11:23:36 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     Maxim Levitsky <mlevitsk@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Keith Busch <kbusch@...nel.org>,
        Josef Bacik <josef@...icpanda.com>,
        "open list:BLOCK LAYER" <linux-block@...r.kernel.org>,
        Sagi Grimberg <sagi@...mberg.me>, Jens Axboe <axboe@...nel.dk>,
        "open list:NVM EXPRESS DRIVER" <linux-nvme@...ts.infradead.org>,
        "open list:SCSI CDROM DRIVER" <linux-scsi@...r.kernel.org>,
        Tejun Heo <tj@...nel.org>,
        Bart Van Assche <bvanassche@....org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Jason Wang <jasowang@...hat.com>,
        Maxim Levitsky <maximlevitsky@...il.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Colin Ian King <colin.king@...onical.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Ajay Joshi <Ajay.Joshi@....com>,
        Ming Lei <ming.lei@...hat.com>,
        "open list:SONY MEMORYSTICK SUBSYSTEM" <linux-mmc@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Satya Tangirala <satyat@...gle.com>,
        "open list:NETWORK BLOCK DEVICE (NBD)" <nbd@...er.debian.org>,
        Hou Tao <houtao1@...wei.com>, Jens Axboe <axboe@...com>,
        "open list:VIRTIO CORE AND NET DRIVERS" 
        <virtualization@...ts.linux-foundation.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Alex Dubov <oakad@...oo.com>
Subject: Re: [PATCH 08/10] block: nvme: use blk_is_valid_logical_block_size

On 2020/07/21 19:55, Maxim Levitsky wrote:
> This replaces manual checking in the driver
> 
> Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
> ---
>  drivers/nvme/host/core.c | 17 ++++++++---------
>  1 file changed, 8 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index add040168e67e..8014b3046992a 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -1849,10 +1849,16 @@ static void nvme_update_disk_info(struct gendisk *disk,
>  	unsigned short bs = 1 << ns->lba_shift;
>  	u32 atomic_bs, phys_bs, io_opt = 0;
>  
> -	if (ns->lba_shift > PAGE_SHIFT) {
> -		/* unsupported block size, set capacity to 0 later */
> +	/*
> +	 * The block layer can't support LBA sizes larger than the page size
> +	 * yet, so catch this early and don't allow block I/O.
> +	 */
> +

No need for the blank line here.

> +	if (!blk_is_valid_logical_block_size(bs)) {
>  		bs = (1 << 9);
> +		capacity = 0;>  	}
> +
>  	blk_mq_freeze_queue(disk->queue);
>  	blk_integrity_unregister(disk);
>  
> @@ -1887,13 +1893,6 @@ static void nvme_update_disk_info(struct gendisk *disk,
>  	blk_queue_io_min(disk->queue, phys_bs);
>  	blk_queue_io_opt(disk->queue, io_opt);
>  
> -	/*
> -	 * The block layer can't support LBA sizes larger than the page size
> -	 * yet, so catch this early and don't allow block I/O.
> -	 */
> -	if (ns->lba_shift > PAGE_SHIFT)
> -		capacity = 0;
> -
>  	/*
>  	 * Register a metadata profile for PI, or the plain non-integrity NVMe
>  	 * metadata masquerading as Type 0 if supported, otherwise reject block
> 

Apart from the nit above, this looks OK to me.

Reviewed-by: Damien Le Moal <damien.lemoal@....com>

-- 
Damien Le Moal
Western Digital Research