Re: [PATCH 10/31] ITER_PIPE: fold data_start() and pipe_space_for_user() together

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To: linux-fsdevel@xxxxxxxxxxxxxxx
Subject: Re: [PATCH 10/31] ITER_PIPE: fold data_start() and pipe_space_for_user() together
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Sun, 19 Jun 2022 03:25:27 +0100
Cc: Christoph Hellwig <hch@xxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>
In-reply-to: <20220618053538.359065-11-viro@zeniv.linux.org.uk>

On Sat, Jun 18, 2022 at 06:35:17AM +0100, Al Viro wrote:
> +	*npages = max(used - (int)pipe->max_usage, 0);

	*npages = max((int)pipe->max_usage - used, 0);

>  	if (off > 0 && off < PAGE_SIZE) { // anon and not full

References:
- Re: [RFC][PATCHES] iov_iter stuff
  - From: Al Viro
- [PATCH 01/31] splice: stop abusing iov_iter_advance() to flush a pipe
  - From: Al Viro
- [PATCH 10/31] ITER_PIPE: fold data_start() and pipe_space_for_user() together
  - From: Al Viro

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