linux-kernel - Re: [PATCH v2 07/17] nfsd: don't keep a pointer to the lease in nfs4

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Date:	Sat, 6 Sep 2014 08:33:03 -0400
From:	Jeff Layton <jeff.layton@...marydata.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 07/17] nfsd: don't keep a pointer to the lease in
 nfs4_file

On Fri, 5 Sep 2014 17:40:58 -0400
"J. Bruce Fields" <bfields@...ldses.org> wrote:

> On Thu, Sep 04, 2014 at 08:38:33AM -0400, Jeff Layton wrote:
> > Now that we don't need to pass in an actual lease pointer to
> > vfs_setlease on unlock, we can stop tracking a pointer to the lease in
> > the nfs4_file.
> > 
> > Switch all of the places that check the fi_lease to check fi_deleg_file
> > instead. We always set that at the same time so it will have the same
> > semantics.
> > 
> > Cc: J. Bruce Fields <bfields@...ldses.org>
> > Signed-off-by: Jeff Layton <jlayton@...marydata.com>
> > Reviewed-by: Christoph Hellwig <hch@....de>
> > ---
> >  fs/nfsd/nfs4state.c | 10 ++++------
> >  fs/nfsd/state.h     |  1 -
> >  2 files changed, 4 insertions(+), 7 deletions(-)
> > 
> > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> > index 0cd252916e1a..d0a6e8e022a2 100644
> > --- a/fs/nfsd/nfs4state.c
> > +++ b/fs/nfsd/nfs4state.c
> > @@ -680,11 +680,10 @@ static void nfs4_put_deleg_lease(struct nfs4_file *fp)
> >  {
> >  	lockdep_assert_held(&state_lock);
> >  
> > -	if (!fp->fi_lease)
> > +	if (!fp->fi_deleg_file)
> >  		return;
> >  	if (atomic_dec_and_test(&fp->fi_delegees)) {
> >  		vfs_setlease(fp->fi_deleg_file, F_UNLCK, NULL);
> > -		fp->fi_lease = NULL;
> >  		fput(fp->fi_deleg_file);
> >  		fp->fi_deleg_file = NULL;
> >  	}
> 
> Note the code in my for-3.18 branch is different here due to a couple
> patches I've already taken from you.
> 
> --b.
> 

Doh! Yes, I'll make sure to pull those into the topic branch where I'm
working on these and rebase on top of them. Thanks!

> > @@ -3061,8 +3060,8 @@ static void nfsd4_init_file(struct nfs4_file *fp, struct knfsd_fh *fh)
> >  	INIT_LIST_HEAD(&fp->fi_stateids);
> >  	INIT_LIST_HEAD(&fp->fi_delegations);
> >  	fh_copy_shallow(&fp->fi_fhandle, fh);
> > +	fp->fi_deleg_file = NULL;
> >  	fp->fi_had_conflict = false;
> > -	fp->fi_lease = NULL;
> >  	fp->fi_share_deny = 0;
> >  	memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
> >  	memset(fp->fi_access, 0, sizeof(fp->fi_access));
> > @@ -3803,13 +3802,12 @@ static int nfs4_setlease(struct nfs4_delegation *dp)
> >  	if (fp->fi_had_conflict)
> >  		goto out_unlock;
> >  	/* Race breaker */
> > -	if (fp->fi_lease) {
> > +	if (fp->fi_deleg_file) {
> >  		status = 0;
> >  		atomic_inc(&fp->fi_delegees);
> >  		hash_delegation_locked(dp, fp);
> >  		goto out_unlock;
> >  	}
> > -	fp->fi_lease = fl;
> >  	fp->fi_deleg_file = filp;
> >  	atomic_set(&fp->fi_delegees, 1);
> >  	hash_delegation_locked(dp, fp);
> > @@ -3842,7 +3840,7 @@ nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
> >  	spin_lock(&state_lock);
> >  	spin_lock(&fp->fi_lock);
> >  	dp->dl_stid.sc_file = fp;
> > -	if (!fp->fi_lease) {
> > +	if (!fp->fi_deleg_file) {
> >  		spin_unlock(&fp->fi_lock);
> >  		spin_unlock(&state_lock);
> >  		status = nfs4_setlease(dp);
> > diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
> > index 4a89e00d7461..64f291a25a8c 100644
> > --- a/fs/nfsd/state.h
> > +++ b/fs/nfsd/state.h
> > @@ -477,7 +477,6 @@ struct nfs4_file {
> >  	atomic_t		fi_access[2];
> >  	u32			fi_share_deny;
> >  	struct file		*fi_deleg_file;
> > -	struct file_lock	*fi_lease;
> >  	atomic_t		fi_delegees;
> >  	struct knfsd_fh		fi_fhandle;
> >  	bool			fi_had_conflict;
> > -- 
> > 1.9.3
> > 
> --
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-- 
Jeff Layton <jlayton@...marydata.com>
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