From: David Laight <David.Laight@ACULAB.COM>
To: 'Al Viro' <viro@zeniv.linux.org.uk>
Cc: 'Mikulas Patocka' <mpatocka@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
Matthew Wilcox <willy@infradead.org>, Jan Kara" <jack@suse.cz>,
Steven Whitehouse <swhiteho@redhat.com>,
Eric Sandeen <esandeen@redhat.com>,
Dave Chinner <dchinner@redhat.com>, Theodore Ts'o <tytso@mit.edu>,
Wang Jianchao <jianchao.wan9@gmail.com>,
"Tadakamadla,"@ml01.01.org, Rajesh@ml01.01.org,
" <rajesh.tadakamadla@hpe.com>,
"@ml01.01.org, linux-kernel@vger.kernel.org,
linux-kernel@vger.kernel.org,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>
Subject: RE: [RFC v2] nvfs: a filesystem for persistent memory
Date: Mon, 11 Jan 2021 14:54:11 +0000 [thread overview]
Message-ID: <de2f960c4fee4b7c9d4ed466b49ec97e@AcuMS.aculab.com> (raw)
In-Reply-To: <20210111144341.GZ3579531@ZenIV.linux.org.uk>
From: Al Viro <viro@ftp.linux.org.uk> On Behalf Of Al Viro
> Sent: 11 January 2021 14:44
> On Mon, Jan 11, 2021 at 11:57:08AM +0000, David Laight wrote:
> > > > > size = copy_to_iter(to, ptr, size);
> > > > > if (unlikely(!size)) {
> > > > > r = -EFAULT;
> > > > > goto ret_r;
> > > > > }
> > > > >
> > > > > pos += size;
> > > > > total += size;
> > > > > }
> > > >
> > > > David
> > >
> > > I fixed the arguments to
> > > copy_to_iter - other than that, Al's function works.
> >
>
> > Oh - the error return for copy_to_iter() is wrong.
> > It should (probably) return 'total' if it is nonzero.
>
> copy_to_iter() call there has an obvious problem
> (arguments in the wrong order), but return value is handled
> correctly. It does not do a blind return -EFAULT. RTFS...
Ah I was looking at the version I'd cut the tail off...
David
-
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prev parent reply other threads:[~2021-01-11 14:54 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 13:15 [RFC v2] nvfs: a filesystem for persistent memory Mikulas Patocka
2021-01-07 15:11 ` Expense of read_iter Matthew Wilcox
2021-01-07 16:43 ` Mingkai Dong
[not found] ` <2041983017.5681521.1610459100858.JavaMail.zimbra@sjtu.edu.cn>
2021-01-12 14:06 ` David Laight
2021-01-13 16:44 ` Mikulas Patocka
[not found] ` <1224425872.715547.1610703643424.JavaMail.zimbra@sjtu.edu.cn>
2021-01-20 4:47 ` Dave Chinner
2021-01-20 14:18 ` Jan Kara
2021-01-20 15:12 ` Mikulas Patocka
2021-01-20 15:44 ` David Laight
2021-01-21 15:47 ` Matthew Wilcox
2021-01-21 16:06 ` Mikulas Patocka
2021-01-07 18:59 ` Mikulas Patocka
2021-01-10 6:13 ` Matthew Wilcox
2021-01-10 21:19 ` Mikulas Patocka
2021-01-11 0:18 ` Matthew Wilcox
2021-01-11 21:10 ` Mikulas Patocka
2021-01-11 10:11 ` David Laight
2021-01-10 16:20 ` [RFC v2] nvfs: a filesystem for persistent memory Al Viro
2021-01-10 16:51 ` Al Viro
2021-01-10 21:14 ` Mikulas Patocka
2021-01-10 23:40 ` Al Viro
2021-01-11 11:41 ` Mikulas Patocka
2021-01-11 10:29 ` David Laight
2021-01-11 11:44 ` Mikulas Patocka
2021-01-11 11:57 ` David Laight
2021-01-11 14:43 ` Al Viro
2021-01-11 14:54 ` David Laight [this message]
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