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Message-ID: <20231004113941.zx3jlgnt23vs453r@localhost>
Date: Wed, 4 Oct 2023 13:39:41 +0200
From: Pankaj Raghav <p.raghav@...sung.com>
To: John Garry <john.g.garry@...cle.com>
CC: <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>,
<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>,
Alan Adamson <alan.adamson@...cle.com>, <p.raghav@...sung.com>
Subject: Re: [PATCH 21/21] nvme: Support atomic writes
> +++ b/drivers/nvme/host/core.c
> @@ -1926,6 +1926,35 @@ 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);
>
> + atomic_bs = rounddown_pow_of_two(atomic_bs);
> + if (id->nsfeat & NVME_NS_FEAT_ATOMICS && id->nawupf) {
> + if (id->nabo) {
> + dev_err(ns->ctrl->device, "Support atomic NABO=%x\n",
> + id->nabo);
> + } else {
> + u32 boundary = 0;
> +
> + if (le16_to_cpu(id->nabspf))
> + boundary = (le16_to_cpu(id->nabspf) + 1) * bs;
> +
> + if (is_power_of_2(boundary) || !boundary) {
> + blk_queue_atomic_write_max_bytes(disk->queue, atomic_bs);
> + blk_queue_atomic_write_unit_min_sectors(disk->queue, 1);
> + blk_queue_atomic_write_unit_max_sectors(disk->queue,
> + atomic_bs / bs);
blk_queue_atomic_write_unit_[min| max]_sectors expects sectors (512 bytes unit)
as input but no conversion is done here from device logical block size
to SECTORs.
> + blk_queue_atomic_write_boundary_bytes(disk->queue, boundary);
> + } else {
> + dev_err(ns->ctrl->device, "Unsupported atomic boundary=0x%x\n",
> + boundary);
> + }
>
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