From: Trond Myklebust <trond.myklebust@primarydata.com>
To: Jan Kara <jack@suse.cz>
Cc: Brown Neil <neilb@suse.de>,
Viro Alexander <viro@zeniv.linux.org.uk>,
NFS <linux-nfs@vger.kernel.org>
Subject: Re: NFS deadlock between 'sync' and commit after unmount....
Date: Mon, 07 Apr 2014 18:09:02 -0400 [thread overview]
Message-ID: <1396908542.5563.12.camel@leira.trondhjem.org> (raw)
In-Reply-To: <20140407202750.GE23670@quack.suse.cz>
On Mon, 2014-04-07 at 22:27 +0200, Jan Kara wrote:
> Hello,
>
> On Mon 07-04-14 10:10:27, Trond Myklebust wrote:
> > The problem seems to be the use of iterate_supers(), which grabs a
> > passive reference, and conflicts with our use of an active reference in
> > the open context.
> Yeah, we cannot really do otherwise in iterate_supers() - we have to grab
> some superblock reference and we don't really want to get an active one
> since that would result in spurious EBUSY returns from umount.
BTW: By what mechanism does an active reference lead to EBUSY issues
here?
--
Trond Myklebust
Linux NFS client maintainer, PrimaryData
trond.myklebust@primarydata.com
next prev parent reply other threads:[~2014-04-07 22:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-07 3:50 NFS deadlock between 'sync' and commit after unmount NeilBrown
2014-04-07 14:10 ` Trond Myklebust
2014-04-07 20:27 ` Jan Kara
2014-04-07 22:02 ` Trond Myklebust
2014-04-07 22:35 ` Jan Kara
2014-04-07 23:07 ` Trond Myklebust
2014-04-10 21:25 ` Jan Kara
2014-04-07 22:09 ` Trond Myklebust [this message]
2014-04-07 22:32 ` Jan Kara
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=1396908542.5563.12.camel@leira.trondhjem.org \
--to=trond.myklebust@primarydata.com \
--cc=jack@suse.cz \
--cc=linux-nfs@vger.kernel.org \
--cc=neilb@suse.de \
--cc=viro@zeniv.linux.org.uk \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.