From: "J. Bruce Fields" <bfields@fieldses.org>
To: Volker Lendecke <Volker.Lendecke@SerNet.DE>
Cc: linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
samba-technical@lists.samba.org,
Casey Bodley <cbodley@citi.umich.edu>
Subject: Re: [PATCH] locks: breaking read lease should not block read open
Date: Fri, 10 Jun 2011 09:48:59 -0400 [thread overview]
Message-ID: <20110610134859.GA27837@fieldses.org> (raw)
In-Reply-To: <E1QUwaT-00HRZw-74@intern.SerNet.DE>
On Fri, Jun 10, 2011 at 09:56:49AM +0200, Volker Lendecke wrote:
> On Thu, Jun 09, 2011 at 07:16:06PM -0400, J. Bruce Fields wrote:
> > The lease code behavior during the lease-breaking process is strange.
> > Fixing it completely would be complicated by the fact that the current
> > code allows a lease break to downgrade the lease instead of necessarily
> > removing it.
> >
> > But I can't see what the point of that feature is. And googling around
> > and looking at the Samba code, I can't see any evidence that anyone uses
> > it. Think we could just do away with removing the ability to downgrade
> > to satisfy a lease break?
>
> Without having looked too deeply, just let me point out that
> Samba here has a plain flaw. Early Linux Kernel versions
> that we programmed against did not properly support read
> only leases, so we did not implement that initially. If I
> remember correctly we never got around to finally do it once
> it became available. Eventually we will probably, as read
> only leases are a pretty important feature to present to
> CIFS clients.
Thanks, I didn't know that. (Or I did, and I forgot.)
When you *do* implement that, is there any chance you'd have this need
to be able to downgrade to a read lease in the case of a conflict?
--b.
next prev parent reply other threads:[~2011-06-10 13:49 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-09 23:16 [PATCH] locks: breaking read lease should not block read open J. Bruce Fields
2011-06-10 7:56 ` Volker Lendecke
2011-06-10 13:48 ` J. Bruce Fields [this message]
2011-07-21 0:07 ` J. Bruce Fields
2011-07-21 0:15 ` Jeremy Allison
2011-07-21 16:35 ` J. Bruce Fields
2011-07-29 2:27 ` J. Bruce Fields
2011-07-29 2:29 ` [PATCH 1/3] locks: minor lease cleanup J. Bruce Fields
2011-07-29 2:29 ` [PATCH 2/3] locks: move F_INPROGRESS from fl_type to fl_flags field J. Bruce Fields
2011-07-29 2:30 ` [PATCH 3/3] locks: fix tracking of inprogress lease breaks J. Bruce Fields
2011-08-19 16:04 ` [PATCH] locks: breaking read lease should not block read open J. Bruce Fields
2011-08-19 16:07 ` [PATCH 1/4] locks: minor lease cleanup J. Bruce Fields
2011-08-19 16:07 ` [PATCH 2/4] locks: move F_INPROGRESS from fl_type to fl_flags field J. Bruce Fields
2011-08-19 16:07 ` [PATCH 3/4] locks: fix tracking of inprogress lease breaks J. Bruce Fields
2011-08-19 16:07 ` [PATCH 4/4] locks: setlease cleanup J. Bruce Fields
2011-08-19 19:08 ` [PATCH] locks: breaking read lease should not block read open Jamie Lokier
2011-08-21 16:50 ` J. Bruce Fields
2011-11-21 12:46 ` Jamie Lokier
2011-11-22 21:44 ` J. Bruce Fields
2011-11-23 0:30 ` Jamie Lokier
2011-11-23 19:08 ` J. Bruce Fields
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