Re: [PATCH v6 10/34] mm, block: Make BIO_PAGE_REFFED/PINNED the same as FOLL_GET/PIN numerically

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To: David Howells <dhowells@xxxxxxxxxx>
Subject: Re: [PATCH v6 10/34] mm, block: Make BIO_PAGE_REFFED/PINNED the same as FOLL_GET/PIN numerically
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 17 Jan 2023 00:03:10 -0800
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Logan Gunthorpe <logang@xxxxxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <167391055339.2311931.11902422289425837725.stgit@warthog.procyon.org.uk>
References: <167391047703.2311931.8115712773222260073.stgit@warthog.procyon.org.uk> <167391055339.2311931.11902422289425837725.stgit@warthog.procyon.org.uk>

On Mon, Jan 16, 2023 at 11:09:13PM +0000, David Howells wrote:
> Make BIO_PAGE_REFFED the same as FOLL_GET and BIO_PAGE_PINNED the same as
> FOLL_PIN numerically so that the BIO_* flags can be passed directly to
> page_put_unpin().

Umm, no.  No matching entangling of flags, please.

References:
- [PATCH v6 00/34] iov_iter: Improve page extraction (ref, pin or just list)
  - From: David Howells
- [PATCH v6 10/34] mm, block: Make BIO_PAGE_REFFED/PINNED the same as FOLL_GET/PIN numerically
  - From: David Howells

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