linux-erofs.lists.ozlabs.org archive mirror
 help / color / mirror / Atom feed
From: Christoph Hellwig <hch@lst.de>
To: Matthew Wilcox <willy@infradead.org>
Cc: "Darrick J . Wong" <djwong@kernel.org>,
	Andreas Gruenbacher <andreas.gruenbacher@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org, linux-erofs@lists.ozlabs.org,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3] iomap: support tail packing inline read
Date: Mon, 19 Jul 2021 17:13:10 +0200	[thread overview]
Message-ID: <20210719151310.GA22355@lst.de> (raw)
In-Reply-To: <YPWUBhxhoaEp8Frn@casper.infradead.org>

On Mon, Jul 19, 2021 at 04:02:30PM +0100, Matthew Wilcox wrote:
> > +	if (iomap->type == IOMAP_INLINE) {
> > +		iomap_read_inline_data(inode, page, iomap, pos);
> > +		plen = PAGE_SIZE - poff;
> > +		goto done;
> > +	}
> 
> This is going to break Andreas' case that he just patched to work.
> GFS2 needs for there to _not_ be an iop for inline data.  That's
> why I said we need to sort out when to create an iop before moving
> the IOMAP_INLINE case below the creation of the iop.
> 
> If we're not going to do that first, then I recommend leaving the
> IOMAP_INLINE case where it is and changing it to ...
> 
> 	if (iomap->type == IOMAP_INLINE)
> 		return iomap_read_inline_data(inode, page, iomap, pos);
> 
> ... and have iomap_read_inline_data() return the number of bytes that
> it copied + zeroed (ie PAGE_SIZE - poff).

Returning the bytes is much cleaner anyway.  But we still need to deal
with the sub-page uptodate status in one form or another.

  reply	other threads:[~2021-07-19 15:23 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 14:47 Gao Xiang
2021-07-19 15:02 ` Matthew Wilcox
2021-07-19 15:13   ` Christoph Hellwig [this message]
2021-07-19 16:11     ` Gao Xiang
2021-07-19 16:31       ` Matthew Wilcox
2021-07-19 16:45         ` Gao Xiang
2021-07-19 15:29   ` Gao Xiang
2021-07-19 15:31     ` Andreas Grünbacher
2021-07-19 15:36       ` Gao Xiang
2021-07-20 11:23 ` Andreas Grünbacher
2021-07-20 12:10   ` Gao Xiang
2021-07-20 11:34 ` Andreas Grünbacher
2021-07-20 12:23   ` Gao Xiang

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=20210719151310.GA22355@lst.de \
    --to=hch@lst.de \
    --cc=andreas.gruenbacher@gmail.com \
    --cc=djwong@kernel.org \
    --cc=linux-erofs@lists.ozlabs.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=willy@infradead.org \
    --subject='Re: [PATCH v3] iomap: support tail packing inline read' \
    /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

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).