Linux-NFS Archive on lore.kernel.org
 help / color / Atom feed
From: Dave Chinner <david@fromorbit.com>
To: Anna Schumaker <schumaker.anna@gmail.com>
Cc: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
	olga.kornievskaia@gmail.com, linux-nfs@vger.kernel.org,
	linux-unionfs@vger.kernel.org, ceph-devel@vger.kernel.org,
	linux-cifs@vger.kernel.org
Subject: Re: [PATCH 09/11] vfs: push copy_file_ranges -EXDEV checks down
Date: Tue, 4 Dec 2018 10:40:28 +1100
Message-ID: <20181203234028.GM6311@dastard> (raw)
In-Reply-To: <679f1cda1b43fc4cfcd6cdf6dbac223b42db24c2.camel@gmail.com>

On Mon, Dec 03, 2018 at 01:53:35PM -0500, Anna Schumaker wrote:
> On Mon, 2018-12-03 at 19:34 +1100, Dave Chinner wrote:
> > From: Dave Chinner <dchinner@redhat.com>
> > 
> > We want to enable cross-filesystem copy_file_range functionality
> > where possible, so push the "same superblock only" checks down to
> > the individual filesystem callouts so they can make their own
> > decisions about cross-superblock copy offload.
....
> > diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
> > index d7766a6eb0f4..4783c0c1c49e 100644
> > --- a/fs/nfs/nfs4file.c
> > +++ b/fs/nfs/nfs4file.c
> > @@ -133,16 +133,20 @@ static ssize_t nfs4_copy_file_range(struct file
> > *file_in, loff_t pos_in,
> >  				    struct file *file_out, loff_t pos_out,
> >  				    size_t count, unsigned int flags)
> >  {
> > -	ssize_t ret;
> > +	ssize_t ret = -EXDEV;
> >  
> >  	if (file_inode(file_in) == file_inode(file_out))
> >  		return -EINVAL;
> > -retry:
> > -	ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
> > -	if (ret == -EAGAIN)
> > -		goto retry;
> >  
> > -	if (ret == -EOPNOTSUPP)
> > +	/* only offload copy if superblock is the same */
> > +	if (file_inode(file_in)->i_sb == file_inode(file_out)->i_sb) {
> > +		do {
> > +			ret = nfs42_proc_copy(file_in, pos_in, file_out,
> > +					pos_out, count);
> > +		} while (ret == -EAGAIN);
> 
> I'm not convinced we can actually return -EAGAIN from nfs42_proc_copy().  The
> nfs_get_lock_context() function doesn't return it, and if _nfs42_proc_copy()
> returns -EAGAIN it's immediately retried by nfs42_proc_copy() instead of
> returning.

Not really my concern, nor something that should be fixed in this
patchset. i.e. the function does the same thing before and after
this patch, so whether EAGAIN can occurr or not is irrelevant to
this patchset....

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

  parent reply index

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-03  8:34 [PATCH 0/11] fs: fixes for major copy_file_range() issues Dave Chinner
2018-12-03  8:34 ` [PATCH 01/11] vfs: copy_file_range source range over EOF should fail Dave Chinner
2018-12-03 12:46   ` Amir Goldstein
2018-12-04 15:13     ` Christoph Hellwig
2018-12-04 21:29       ` Dave Chinner
2018-12-04 21:47         ` Olga Kornievskaia
2018-12-04 22:31           ` Dave Chinner
2018-12-05 16:51             ` bfields
2019-05-20  9:10             ` Amir Goldstein
2019-05-20 13:12               ` Olga Kornievskaia
2019-05-20 13:36                 ` Amir Goldstein
2019-05-20 13:58                   ` Olga Kornievskaia
2019-05-20 14:02                     ` Amir Goldstein
2018-12-05 14:12         ` Christoph Hellwig
2018-12-05 21:08           ` Dave Chinner
2018-12-05 21:30             ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 02/11] vfs: introduce generic_copy_file_range() Dave Chinner
2018-12-03 10:03   ` Amir Goldstein
2018-12-03 23:00     ` Dave Chinner
2018-12-04 15:14   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 03/11] vfs: no fallback for ->copy_file_range Dave Chinner
2018-12-03 10:22   ` Amir Goldstein
2018-12-03 23:02     ` Dave Chinner
2018-12-06  4:16       ` Amir Goldstein
2018-12-06 21:30         ` Dave Chinner
2018-12-07  5:38           ` Amir Goldstein
2018-12-03 18:23   ` Anna Schumaker
2018-12-04 15:16   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 04/11] vfs: add missing checks to copy_file_range Dave Chinner
2018-12-03 12:42   ` Amir Goldstein
2018-12-03 19:04   ` Darrick J. Wong
2018-12-03 21:33   ` Olga Kornievskaia
2018-12-03 23:04     ` Dave Chinner
2018-12-04 15:18   ` Christoph Hellwig
2018-12-12 11:31   ` Luis Henriques
2018-12-12 16:42     ` Darrick J. Wong
2018-12-12 18:55     ` Olga Kornievskaia
2018-12-12 19:42       ` Matthew Wilcox
2018-12-12 20:22         ` Olga Kornievskaia
2018-12-13 10:29           ` Luis Henriques
2018-12-03  8:34 ` [PATCH 05/11] vfs: use inode_permission in copy_file_range() Dave Chinner
2018-12-03 12:47   ` Amir Goldstein
2018-12-03 18:18   ` Darrick J. Wong
2018-12-03 23:55     ` Dave Chinner
2018-12-05 17:28       ` bfields
2018-12-03 18:53   ` Eric Biggers
2018-12-04 15:19   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 06/11] vfs: copy_file_range needs to strip setuid bits Dave Chinner
2018-12-03 12:51   ` Amir Goldstein
2018-12-04 15:21   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 07/11] vfs: copy_file_range should update file timestamps Dave Chinner
2018-12-03 10:47   ` Amir Goldstein
2018-12-03 17:33     ` Olga Kornievskaia
2018-12-03 18:22       ` Darrick J. Wong
2018-12-03 23:19     ` Dave Chinner
2018-12-04 15:24   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 08/11] vfs: push EXDEV check down into ->remap_file_range Dave Chinner
2018-12-03 11:04   ` Amir Goldstein
2018-12-03 19:11     ` Darrick J. Wong
2018-12-03 23:37       ` Dave Chinner
2018-12-03 23:58         ` Darrick J. Wong
2018-12-04  9:17           ` Amir Goldstein
2018-12-03 23:34     ` Dave Chinner
2018-12-03 18:24   ` Darrick J. Wong
2018-12-04  8:18   ` Olga Kornievskaia
2018-12-03  8:34 ` [PATCH 09/11] vfs: push copy_file_ranges -EXDEV checks down Dave Chinner
2018-12-03 12:36   ` Amir Goldstein
2018-12-03 17:58   ` Olga Kornievskaia
2018-12-03 18:53   ` Anna Schumaker
2018-12-03 19:27     ` Olga Kornievskaia
2018-12-03 23:40     ` Dave Chinner [this message]
2018-12-04 15:43   ` Christoph Hellwig
2018-12-04 22:18     ` Dave Chinner
2018-12-04 23:33       ` Olga Kornievskaia
2018-12-05 14:09       ` Christoph Hellwig
2018-12-05 17:01         ` Olga Kornievskaia
2018-12-03  8:34 ` [PATCH 10/11] vfs: allow generic_copy_file_range to copy across devices Dave Chinner
2018-12-03 12:54   ` Amir Goldstein
2018-12-03  8:34 ` [PATCH 11/11] ovl: allow cross-device copy_file_range calls Dave Chinner
2018-12-03 12:55   ` Amir Goldstein
2018-12-03  8:39 ` [PATCH 12/11] man-pages: copy_file_range updates Dave Chinner
2018-12-03 13:05   ` Amir Goldstein
2019-05-21  5:52   ` Amir Goldstein

Reply instructions:

You may reply publically 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=20181203234028.GM6311@dastard \
    --to=david@fromorbit.com \
    --cc=ceph-devel@vger.kernel.org \
    --cc=linux-cifs@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-nfs@vger.kernel.org \
    --cc=linux-unionfs@vger.kernel.org \
    --cc=linux-xfs@vger.kernel.org \
    --cc=olga.kornievskaia@gmail.com \
    --cc=schumaker.anna@gmail.com \
    /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

Linux-NFS Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-nfs/0 linux-nfs/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-nfs linux-nfs/ https://lore.kernel.org/linux-nfs \
		linux-nfs@vger.kernel.org linux-nfs@archiver.kernel.org
	public-inbox-index linux-nfs


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-nfs


AGPL code for this site: git clone https://public-inbox.org/ public-inbox