Re: [PATCH v20 29/32] block: Replace BIO_NO_PAGE_REF with BIO_PAGE_REFFED with inverted logic

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To: David Howells <dhowells@xxxxxxxxxx>
Subject: Re: [PATCH v20 29/32] block: Replace BIO_NO_PAGE_REF with BIO_PAGE_REFFED with inverted logic
From: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Date: Fri, 19 May 2023 21:26:07 -0400
Cc: Jens Axboe <axboe@xxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxxxx>, Logan Gunthorpe <logang@xxxxxxxxxxxx>, Hillf Danton <hdanton@xxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Christoph Hellwig <hch@xxxxxx>, John Hubbard <jhubbard@xxxxxxxxxx>
In-reply-to: <20230519074047.1739879-30-dhowells@redhat.com>
References: <20230519074047.1739879-1-dhowells@redhat.com> <20230519074047.1739879-30-dhowells@redhat.com>

On Fri, May 19, 2023 at 08:40:44AM +0100, David Howells wrote:
> From: Christoph Hellwig <hch@xxxxxx>
> 
> Replace BIO_NO_PAGE_REF with a BIO_PAGE_REFFED flag that has the inverted
> meaning is only set when a page reference has been acquired that needs to
> be released by bio_release_pages().

What was the motivation for this patch?

Follow-Ups:
- Re: [PATCH v20 29/32] block: Replace BIO_NO_PAGE_REF with BIO_PAGE_REFFED with inverted logic
  - From: Christoph Hellwig

References:
- [PATCH v20 00/32] splice, block: Use page pinning and kill ITER_PIPE
  - From: David Howells
- [PATCH v20 29/32] block: Replace BIO_NO_PAGE_REF with BIO_PAGE_REFFED with inverted logic
  - From: David Howells

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