From: Al Viro <viro@ZenIV.linux.org.uk>
To: Oleg Drokin <green@linuxhacker.ru>
Cc: Mailing List <linux-kernel@vger.kernel.org>,
"<linux-fsdevel@vger.kernel.org>" <linux-fsdevel@vger.kernel.org>
Subject: Re: More parallel atomic_open/d_splice_alias fun with NFS and possibly more FSes.
Date: Tue, 5 Jul 2016 19:08:41 +0100 [thread overview]
Message-ID: <20160705180841.GO14480@ZenIV.linux.org.uk> (raw)
In-Reply-To: <6D633478-6B94-465E-84D7-C0BA59C5E5F5@linuxhacker.ru>
On Tue, Jul 05, 2016 at 12:33:09PM -0400, Oleg Drokin wrote:
> This also makes me question the whole thing some more. We are definitely in lookup
> when this hits, so the dentry is already new, yet it does not check off as
> d_in_lookup(). That also means that by skipping the ll_splice_alias we are failing
> to hash it and that causing needless lookups later?
> Looking some back into the history of commits, d_in_lookup() is to tell us
> that we are in the middle of lookup. How can we be in the middle of lookup
> path then and not have this set on a dentry? We know dentry was not
> substituted with anything here because we did not call into ll_split_alias().
> So what's going on then?
Lookup in directory locked exclusive, that's what... In unlink(), in your
testcase. And yes, this piece of 1/3 is incorrect; what I do not understand
is the logics of what you are doing with dcache in ll_splice_alias() and
in its caller ;-/
next prev parent reply other threads:[~2016-07-05 18:08 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-17 4:09 More parallel atomic_open/d_splice_alias fun with NFS and possibly more FSes Oleg Drokin
2016-06-17 4:29 ` Al Viro
2016-06-25 16:38 ` Oleg Drokin
2016-07-03 6:29 ` Al Viro
2016-07-04 0:08 ` Al Viro
2016-07-04 0:37 ` Oleg Drokin
2016-07-04 3:08 ` Al Viro
2016-07-04 3:55 ` Oleg Drokin
2016-07-05 2:25 ` Al Viro
2016-07-10 17:01 ` Oleg Drokin
2016-07-10 18:14 ` James Simmons
2016-07-11 1:01 ` Al Viro
2016-07-11 1:03 ` Al Viro
2016-07-11 22:54 ` lustre sendmsg stuff Oleg Drokin
2016-07-11 17:15 ` More parallel atomic_open/d_splice_alias fun with NFS and possibly more FSes James Simmons
2016-07-05 2:28 ` Oleg Drokin
2016-07-05 2:32 ` Oleg Drokin
2016-07-05 4:43 ` Oleg Drokin
2016-07-05 6:22 ` Oleg Drokin
2016-07-05 12:31 ` Al Viro
2016-07-05 13:51 ` Al Viro
2016-07-05 15:21 ` Oleg Drokin
2016-07-05 17:42 ` Al Viro
2016-07-05 18:12 ` Oleg Drokin
2016-07-05 16:33 ` Oleg Drokin
2016-07-05 18:08 ` Al Viro [this message]
2016-07-05 19:12 ` Oleg Drokin
2016-07-05 20:08 ` Al Viro
2016-07-05 20:21 ` Oleg Drokin
2016-07-06 0:29 ` Oleg Drokin
2016-07-06 3:20 ` Al Viro
2016-07-06 3:25 ` Oleg Drokin
2016-07-06 4:35 ` Oleg Drokin
2016-07-06 16:24 ` Oleg Drokin
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=20160705180841.GO14480@ZenIV.linux.org.uk \
--to=viro@zeniv.linux.org.uk \
--cc=green@linuxhacker.ru \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@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).