linux-kernel - Re: [PATCH 18/21] scsi: sd: Support reading atomic properties from block limits VPD

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Date:   Fri, 29 Sep 2023 10:54:35 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     John Garry <john.g.garry@...cle.com>, axboe@...nel.dk,
        kbusch@...nel.org, hch@....de, sagi@...mberg.me,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, djwong@...nel.org,
        viro@...iv.linux.org.uk, brauner@...nel.org,
        chandan.babu@...cle.com, dchinner@...hat.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, tytso@....edu, jbongio@...gle.com,
        linux-api@...r.kernel.org
Subject: Re: [PATCH 18/21] scsi: sd: Support reading atomic properties from
 block limits VPD

On 9/29/23 03:27, John Garry wrote:
> +static void sd_config_atomic(struct scsi_disk *sdkp)
> +{
> +	unsigned int logical_block_size = sdkp->device->sector_size;
> +	struct request_queue *q = sdkp->disk->queue;
> +
> +	if (sdkp->max_atomic) {

Please use the "return early" style here to keep the indentation
level in this function low.

> +		unsigned int max_atomic = max_t(unsigned int,
> +			rounddown_pow_of_two(sdkp->max_atomic),
> +			rounddown_pow_of_two(sdkp->max_atomic_with_boundary));
> +		unsigned int unit_min = sdkp->atomic_granularity ?
> +			rounddown_pow_of_two(sdkp->atomic_granularity) :
> +			physical_block_size_sectors;
> +		unsigned int unit_max = max_atomic;
> +
> +		if (sdkp->max_atomic_boundary)
> +			unit_max = min_t(unsigned int, unit_max,
> +				rounddown_pow_of_two(sdkp->max_atomic_boundary));

Why does "rounddown_pow_of_two()" occur in the above code?

Thanks,

Bart.