linux-kernel - Re: More parallel atomic_open/d_splice_alias fun with NFS and possibly more FSes.

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Message-ID: <20160704000802.GH14480@ZenIV.linux.org.uk>
Date:	Mon, 4 Jul 2016 01:08:02 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Oleg Drokin <green@...uxhacker.ru>
Cc:	Mailing List <linux-kernel@...r.kernel.org>,
	"<linux-fsdevel@...r.kernel.org>" <linux-fsdevel@...r.kernel.org>
Subject: Re: More parallel atomic_open/d_splice_alias fun with NFS and
 possibly more FSes.

On Sun, Jul 03, 2016 at 07:29:46AM +0100, Al Viro wrote:

> Tentative NFS patch follows; I don't understand Lustre well enough, but it
> looks like a plausible strategy there as well.

Speaking of Lustre: WTF is
                        /* Open dentry. */
                        if (S_ISFIFO(d_inode(dentry)->i_mode)) {
                                /* We cannot call open here as it would
                                 * deadlock.
                                 */
                                if (it_disposition(it, DISP_ENQ_OPEN_REF))
                                        ptlrpc_req_finished(
                                                       (struct ptlrpc_request *)
                                                          it->d.lustre.it_data);
                                rc = finish_no_open(file, de);
                        } else {
about and why do we only do that to FIFOs?  What about symlinks or device
nodes?  Directories, for that matter...  Shouldn't that be if (!S_ISREG(...))
instead?