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From: Christoph Hellwig <hch@infradead.org>
To: Brian Foster <bfoster@redhat.com>
Cc: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org
Subject: Re: [PATCH 2/2] iomap: zero cached pages over unwritten extents on zero range
Date: Thu, 15 Oct 2020 10:49:01 +0100
Message-ID: <20201015094901.GC21420@infradead.org> (raw)
In-Reply-To: <20201012140350.950064-3-bfoster@redhat.com>

> +iomap_zero_range_skip_uncached(struct inode *inode, loff_t *pos,
> +		loff_t *count, loff_t *written)
> +{
> +	unsigned dirty_offset, bytes = 0;
> +
> +	dirty_offset = page_cache_seek_hole_data(inode, *pos, *count,
> +				SEEK_DATA);
> +	if (dirty_offset == -ENOENT)
> +		bytes = *count;
> +	else if (dirty_offset > *pos)
> +		bytes = dirty_offset - *pos;
> +
> +	if (bytes) {
> +		*pos += bytes;
> +		*count -= bytes;
> +		*written += bytes;
> +	}

I find the calling conventions weird.  why not return bytes and
keep the increments/decrements of the three variables in the caller?

  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12 14:03 [PATCH 0/2] iomap: zero dirty pages over unwritten extents Brian Foster
2020-10-12 14:03 ` [PATCH 1/2] iomap: use page dirty state to seek data " Brian Foster
2020-10-13 12:30   ` Brian Foster
2020-10-13 22:53   ` Dave Chinner
2020-10-14 12:59     ` Brian Foster
2020-10-14 22:37       ` Dave Chinner
2020-10-15  9:47   ` Christoph Hellwig
2020-10-19 16:55     ` Brian Foster
2020-10-27 18:07       ` Christoph Hellwig
2020-10-28 11:31         ` Brian Foster
2020-10-12 14:03 ` [PATCH 2/2] iomap: zero cached pages over unwritten extents on zero range Brian Foster
2020-10-15  9:49   ` Christoph Hellwig [this message]
2020-10-19 16:55     ` Brian Foster
2020-10-19 18:01       ` Brian Foster
2020-10-20 16:21         ` Brian Foster
2020-10-27 18:15           ` Christoph Hellwig
2020-10-28 11:31             ` Brian Foster
2020-10-23  1:02   ` [iomap] 11b5156248: xfstests.xfs.310.fail kernel test robot

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