From: David Howells <dhowells@redhat.com>
To: Jan Kara <jack@suse.cz>
Cc: dhowells@redhat.com, Jens Axboe <axboe@kernel.dk>,
Al Viro <viro@zeniv.linux.org.uk>, Christoph Hellwig <hch@lst.de>,
Matthew Wilcox <willy@infradead.org>,
Logan Gunthorpe <logang@deltatee.com>,
Christoph Hellwig <hch@infradead.org>,
Jeff Layton <jlayton@kernel.org>,
linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 7/7] iov_iter, block: Make bio structs pin pages rather than ref'ing if appropriate
Date: Tue, 10 Jan 2023 14:42:04 +0000 [thread overview]
Message-ID: <2155893.1673361724@warthog.procyon.org.uk> (raw)
In-Reply-To: <20230109172500.bd4z2incticapm7x@quack3>
Jan Kara <jack@suse.cz> wrote:
> ... So filesystems really need DIO reads to use FOLL_PIN instead of FOLL_GET
> and consequently we need to pass information to bio completion function how
> page references should be dropped.
That information would be available in the bio struct with this patch if
necessary, though transcribed into a combination of BIO_* flags instead off
FOLL_* flags.
I wonder if there's the possibility of the filesystem that generated the bio
nicking the pages out of the bio and putting them itself.
David
next prev parent reply other threads:[~2023-01-10 14:43 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-07 0:33 [PATCH v4 0/7] iov_iter: Add extraction helpers David Howells
2023-01-07 0:33 ` [PATCH v4 1/7] iov_iter: Change the direction macros into an enum David Howells
2023-01-07 0:33 ` [PATCH v4 2/7] iov_iter: Use the direction in the iterator functions David Howells
2023-01-07 0:33 ` [PATCH v4 3/7] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction David Howells
2023-01-07 0:33 ` [PATCH v4 4/7] iov_iter: Add a function to extract a page list from an iterator David Howells
2023-01-07 0:34 ` [PATCH v4 5/7] netfs: Add a function to extract a UBUF or IOVEC into a BVEC iterator David Howells
2023-01-07 0:34 ` [PATCH v4 6/7] netfs: Add a function to extract an iterator into a scatterlist David Howells
2023-01-07 0:34 ` [PATCH v4 7/7] iov_iter, block: Make bio structs pin pages rather than ref'ing if appropriate David Howells
2023-01-09 3:54 ` Jens Axboe
2023-01-09 9:43 ` David Howells
2023-01-09 17:25 ` Jan Kara
2023-01-10 14:42 ` David Howells [this message]
2023-01-11 9:58 ` Jan Kara
2023-01-09 17:27 ` Jens Axboe
2023-01-09 17:35 ` Jan Kara
2023-01-09 21:37 ` David Howells
2023-01-09 21:57 ` Jens Axboe
2023-01-09 22:24 ` David Howells
2023-01-09 22:57 ` Jens Axboe
2023-01-10 14:37 ` David Howells
2023-01-10 21:41 ` Jens Axboe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=2155893.1673361724@warthog.procyon.org.uk \
--to=dhowells@redhat.com \
--cc=axboe@kernel.dk \
--cc=hch@infradead.org \
--cc=hch@lst.de \
--cc=jack@suse.cz \
--cc=jlayton@kernel.org \
--cc=linux-block@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=logang@deltatee.com \
--cc=viro@zeniv.linux.org.uk \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox