linux-kernel - Re: [PATCH v2 01/17] locks: consolidate "nolease" routines

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Message-ID: <CAABAsM6v3-f_7cco8f_F5Wpy7PWJOUywQHH7A=mZ-LyHRASZ7Q@mail.gmail.com>
Date:	Thu, 4 Sep 2014 14:25:35 -0400
From:	Trond Myklebust <trond.myklebust@...marydata.com>
To:	Jeff Layton <jeff.layton@...marydata.com>
Cc:	Devel FS Linux <linux-fsdevel@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Linux Kernel mailing list <linux-kernel@...r.kernel.org>,
	Steven Whitehouse <swhiteho@...hat.com>,
	cluster-devel <cluster-devel@...hat.com>
Subject: Re: [PATCH v2 01/17] locks: consolidate "nolease" routines

On Thu, Sep 4, 2014 at 8:49 AM, Jeff Layton <jeff.layton@...marydata.com> wrote:
> On Thu, 4 Sep 2014 08:41:51 -0400
> Trond Myklebust <trond.myklebust@...marydata.com> wrote:
>
>> On Thu, Sep 4, 2014 at 8:38 AM, Jeff Layton <jlayton@...marydata.com> wrote:
>> > GFS2 and NFS have setlease routines that always just return -EINVAL.
>> > Turn that into a generic routine that can live in fs/libfs.c.
>> >
>> > Cc: Trond Myklebust <trond.myklebust@...marydata.com>
>> > Cc: <linux-nfs@...r.kernel.org>
>> > Cc: Steven Whitehouse <swhiteho@...hat.com>
>> > Cc: <cluster-devel@...hat.com>
>> > Signed-off-by: Jeff Layton <jlayton@...marydata.com>
>> > ---
>> >  fs/gfs2/file.c     | 22 +---------------------
>> >  fs/libfs.c         | 16 ++++++++++++++++
>> >  fs/nfs/file.c      | 13 +------------
>> >  fs/nfs/internal.h  |  1 -
>> >  fs/nfs/nfs4file.c  |  2 +-
>> >  include/linux/fs.h |  1 +
>> >  6 files changed, 20 insertions(+), 35 deletions(-)
>>
>> Acked-by: Trond Myklebust <trond.myklebust@...marydata.com>
>>
>
> Thanks. While spinning this up, I did have a momentary pause to wonder
> if -ENOLCK would be a better return value here.
>
> It would make it easier to distinguish this from from "oops, I passed
> in bogus arguments". For now, I'll leave it as -EINVAL, but it's
> something to consider...
>

Actually, it looks as if when you compile with !CONFIG_FILE_LOCKING,
then fcntl_setlease() returns the value '0' (which would be
"success!"). The word "confusing" only begins to describe it all.

Cheers
  Trond
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