linux-kernel - Re: [PATCH v2 13/21] block, blksnap: functions and structures for performing block I/O operations

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Date:   Thu, 15 Dec 2022 02:06:22 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Sergei Shtepa <sergei.shtepa@...am.com>
Cc:     axboe@...nel.dk, corbet@....net, linux-block@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 13/21] block, blksnap: functions and structures for
 performing block I/O operations

> +	bio = bio_alloc_bioset(diff_region->bdev, nr_iovecs, opf, gfp_mask,
> +			       &diff_io_bioset);
> +	if (unlikely(!bio)) {
> +		if (is_nowait)
> +			ret = -EAGAIN;
> +		else
> +			ret = -ENOMEM;
> +		goto fail;

bio_alloc_bioset can't fail for the !is_nowait case.