From: Al Viro <viro@ZenIV.linux.org.uk>
To: Dave Chinner <david@fromorbit.com>
Cc: Dave Jones <davej@codemonkey.org.uk>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
linux-xfs@vger.kernel.org
Subject: Re: iov_iter_pipe warning.
Date: Sun, 10 Sep 2017 22:19:07 +0100 [thread overview]
Message-ID: <20170910211907.GF5426@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20170910211110.GM17782@dastard>
On Mon, Sep 11, 2017 at 07:11:10AM +1000, Dave Chinner wrote:
> On Sun, Sep 10, 2017 at 03:57:21AM +0100, Al Viro wrote:
> > On Sat, Sep 09, 2017 at 09:07:56PM -0400, Dave Jones wrote:
> >
> > > With this in place, I'm still seeing -EBUSY from invalidate_inode_pages2_range
> > > which doesn't end well...
> >
> > Different issue, and I'm not sure why that WARN_ON() is there in the
> > first place. Note that in a similar situation generic_file_direct_write()
> > simply buggers off and lets the caller do buffered write...
>
> XFS does not fall back to buffered IO when direct IO fails. A
> direct IO failure is indicative of a problem that needs to be fixed,
> not use a "let's hope we can hide this" fallback path. Especially in
> this case - EBUSY usually comes from the app is doing something we
> /know/ is dangerous and it's occurrence to completely timing
> dependent - if the timing is slightly different, we miss detection
> and that can lead to silent data corruption.
In this case app is a fuzzer, which is bloody well supposed to poke
into all kinds of odd usage patterns, though...
next prev parent reply other threads:[~2017-09-10 21:19 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170412152600.GP29622@ZenIV.linux.org.uk>
[not found] ` <20170412162709.bn5qfk4seues3yos@codemonkey.org.uk>
[not found] ` <20170412170723.GQ29622@ZenIV.linux.org.uk>
[not found] ` <20170412190318.srkkdytf2ebrjzrg@codemonkey.org.uk>
[not found] ` <20170421175430.GT29622@ZenIV.linux.org.uk>
[not found] ` <20170428152955.mafs3f22srmm34aw@codemonkey.org.uk>
[not found] ` <20170428164313.GK29622@ZenIV.linux.org.uk>
[not found] ` <20170428165024.ofyl2atpjwohekqa@codemonkey.org.uk>
[not found] ` <20170428172024.GL29622@ZenIV.linux.org.uk>
[not found] ` <20170807201818.kykqzexce6ap6aik@codemonkey.org.uk>
2017-08-28 20:31 ` iov_iter_pipe warning Dave Jones
2017-08-29 4:25 ` Darrick J. Wong
2017-08-30 17:05 ` Dave Jones
2017-08-30 17:13 ` Darrick J. Wong
2017-08-30 17:17 ` Dave Jones
2017-09-06 20:03 ` Dave Jones
2017-09-06 23:46 ` Dave Chinner
2017-09-07 3:48 ` Dave Jones
2017-09-07 4:33 ` Al Viro
2017-09-08 1:04 ` Al Viro
2017-09-10 1:07 ` Dave Jones
2017-09-10 2:57 ` Al Viro
2017-09-10 16:07 ` Dave Jones
2017-09-10 20:05 ` Al Viro
2017-09-10 20:07 ` Dave Jones
2017-09-10 20:33 ` Al Viro
2017-09-10 21:11 ` Dave Chinner
2017-09-10 21:19 ` Al Viro [this message]
2017-09-10 22:08 ` Dave Chinner
2017-09-10 23:07 ` Al Viro
2017-09-10 23:15 ` Al Viro
2017-09-11 0:31 ` Dave Chinner
2017-09-11 3:32 ` Al Viro
2017-09-11 6:44 ` Dave Chinner
2017-09-11 20:07 ` Al Viro
2017-09-11 20:17 ` Al Viro
2017-09-12 6:02 ` Dave Chinner
2017-09-12 11:13 ` Al Viro
2017-09-11 12:07 ` Christoph Hellwig
2017-09-11 12:51 ` Al Viro
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=20170910211907.GF5426@ZenIV.linux.org.uk \
--to=viro@zeniv.linux.org.uk \
--cc=darrick.wong@oracle.com \
--cc=davej@codemonkey.org.uk \
--cc=david@fromorbit.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-xfs@vger.kernel.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;
as well as URLs for NNTP newsgroup(s).