linux-kernel - Re: [PATCH v10 13/13] dm: add power-of-2 target for zoned devices with non power-of-2 zone sizes

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Date:   Tue, 16 Aug 2022 10:02:29 +0200
From:   Pankaj Raghav <p.raghav@...sung.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        <snitzer@...nel.org>, <axboe@...nel.dk>, <hch@....de>,
        <agk@...hat.com>
CC:     <linux-block@...r.kernel.org>, <Johannes.Thumshirn@....com>,
        <bvanassche@....org>, <matias.bjorling@....com>, <hare@...e.de>,
        <gost.dev@...sung.com>, <linux-nvme@...ts.infradead.org>,
        <jaegeuk@...nel.org>, <pankydev8@...il.com>,
        <linux-kernel@...r.kernel.org>, <dm-devel@...hat.com>,
        Damien Le Moal <damien.lemoal@....com>,
        Joel Granados <j.granados@...sung.com>
Subject: Re: [PATCH v10 13/13] dm: add power-of-2 target for zoned devices
 with non power-of-2 zone sizes

> 
> I think this is way better. But I would still reorganize this like this:
> 
> static int dm_po2z_map(struct dm_target *ti, struct bio *bio)
> {
>         struct dm_po2z_target *dmh = ti->private;
>         int split_io_pos;
> 
>         bio_set_dev(bio, dmh->dev->bdev);
> 
>         if (op_is_zone_mgmt(bio_op(bio)))
>                 return dm_po2z_remap_sector(dmh, bio);
> 
>         if (!bio_sectors(bio))
>                 return DM_MAPIO_REMAPPED;
> 
>         /*
>          * Read operation on the emulated zone area (between zone capacity
>          * and zone size) will fill the bio with zeroes. Any other operation
>          * in the emulated area should return an error.
>          */
>         if (!bio_in_emulated_zone_area(dmh, bio, &split_io_pos))
>                 return dm_po2z_remap_sector(dmh, bio);
> 
>         if (bio_op(bio) == REQ_OP_READ) {
>                 if (split_io_pos > 0) {
>                         dm_accept_partial_bio(bio, split_io_pos);
>                         return dm_po2z_remap_sector(dmh, bio);
>                 }
>                 return dm_po2z_read_zeroes(bio);
>         }
> 
>         return DM_MAPIO_KILL;
> }
> 
> I find the code easier to follow this way.
> 
I agree. It is definitely easier to follow. I will make these changes
and send the next version soon.
> 
>