[PATCH v1 002/104] NFSd: Avoid taking state_lock while holding inode lock in nfsd_break_one_deleg

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From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

state_lock is a heavily contended global lock. We don't want to grab
that while simultaneously holding the inode->i_lock
Instead do the list manipulations from the work queue context prior to
starting the rpc call.

Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
 fs/nfsd/nfs4callback.c | 18 ++++++++++++++++--
 fs/nfsd/nfs4state.c    | 42 ++++++++++++++++++++++++++++--------------
 fs/nfsd/state.h        |  2 ++
 3 files changed, 46 insertions(+), 16 deletions(-)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 2c73cae9899d..3d67bbf26cee 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1011,9 +1011,8 @@ static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
 		run_nfsd4_cb(cb);
 }
 
-static void nfsd4_do_callback_rpc(struct work_struct *w)
+static void nfsd4_run_callback_rpc(struct nfsd4_callback *cb)
 {
-	struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work);
 	struct nfs4_client *clp = cb->cb_clp;
 	struct rpc_clnt *clnt;
 
@@ -1031,11 +1030,25 @@ static void nfsd4_do_callback_rpc(struct work_struct *w)
 			cb->cb_ops, cb);
 }
 
+static void nfsd4_do_callback_rpc(struct work_struct *w)
+{
+	struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work);
+	nfsd4_run_callback_rpc(cb);
+}
+
 void nfsd4_init_callback(struct nfsd4_callback *cb)
 {
 	INIT_WORK(&cb->cb_work, nfsd4_do_callback_rpc);
 }
 
+static void nfsd4_do_cb_recall(struct work_struct *w)
+{
+	struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work);
+
+	nfsd4_prepare_cb_recall(cb->cb_op);
+	nfsd4_run_callback_rpc(cb);
+}
+
 void nfsd4_cb_recall(struct nfs4_delegation *dp)
 {
 	struct nfsd4_callback *cb = &dp->dl_recall;
@@ -1052,6 +1065,7 @@ void nfsd4_cb_recall(struct nfs4_delegation *dp)
 
 	INIT_LIST_HEAD(&cb->cb_per_client);
 	cb->cb_done = true;
+	INIT_WORK(&cb->cb_work, nfsd4_do_cb_recall);
 
 	run_nfsd4_cb(&dp->dl_recall);
 }
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 4e4b054a545e..42c6d6ecc77d 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -438,7 +438,9 @@ hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
 	lockdep_assert_held(&state_lock);
 
 	dp->dl_stid.sc_type = NFS4_DELEG_STID;
+	spin_lock(&fp->fi_lock);
 	list_add(&dp->dl_perfile, &fp->fi_delegations);
+	spin_unlock(&fp->fi_lock);
 	list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
 }
 
@@ -446,14 +448,18 @@ hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
 static void
 unhash_delegation(struct nfs4_delegation *dp)
 {
+	struct nfs4_file *fp = dp->dl_file;
+
 	spin_lock(&state_lock);
 	list_del_init(&dp->dl_perclnt);
-	list_del_init(&dp->dl_perfile);
 	list_del_init(&dp->dl_recall_lru);
+	spin_lock(&fp->fi_lock);
+	list_del_init(&dp->dl_perfile);
+	spin_unlock(&fp->fi_lock);
 	spin_unlock(&state_lock);
-	if (dp->dl_file) {
-		nfs4_put_deleg_lease(dp->dl_file);
-		put_nfs4_file(dp->dl_file);
+	if (fp) {
+		nfs4_put_deleg_lease(fp);
+		put_nfs4_file(fp);
 		dp->dl_file = NULL;
 	}
 }
@@ -2538,6 +2544,7 @@ static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
 	lockdep_assert_held(&state_lock);
 
 	atomic_set(&fp->fi_ref, 1);
+	spin_lock_init(&fp->fi_lock);
 	INIT_LIST_HEAD(&fp->fi_stateids);
 	INIT_LIST_HEAD(&fp->fi_delegations);
 	ihold(ino);
@@ -2783,24 +2790,31 @@ out:
 	return ret;
 }
 
-static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
+void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp)
 {
 	struct nfs4_client *clp = dp->dl_stid.sc_client;
 	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 
-	lockdep_assert_held(&state_lock);
+	/*
+	 * We can't do this in nfsd_break_deleg_cb because it is
+	 * already holding inode->i_lock
+	 */
+	spin_lock(&state_lock);
+	if (list_empty(&dp->dl_recall_lru)) {
+		dp->dl_time = get_seconds();
+		list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
+	}
+	spin_unlock(&state_lock);
+}
+
+static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
+{
 	/* We're assuming the state code never drops its reference
 	 * without first removing the lease.  Since we're in this lease
 	 * callback (and since the lease code is serialized by the kernel
 	 * lock) we know the server hasn't removed the lease yet, we know
 	 * it's safe to take a reference: */
 	atomic_inc(&dp->dl_count);
-
-	list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
-
-	/* Only place dl_time is set; protected by i_lock: */
-	dp->dl_time = get_seconds();
-
 	nfsd4_cb_recall(dp);
 }
 
@@ -2825,11 +2839,11 @@ static void nfsd_break_deleg_cb(struct file_lock *fl)
 	 */
 	fl->fl_break_time = 0;
 
-	spin_lock(&state_lock);
 	fp->fi_had_conflict = true;
+	spin_lock(&fp->fi_lock);
 	list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
 		nfsd_break_one_deleg(dp);
-	spin_unlock(&state_lock);
+	spin_unlock(&fp->fi_lock);
 }
 
 static
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 374c66283ac5..366887ab5204 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -382,6 +382,7 @@ static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
 /* nfs4_file: a file opened by some number of (open) nfs4_stateowners. */
 struct nfs4_file {
 	atomic_t		fi_ref;
+	spinlock_t		fi_lock;
 	struct hlist_node       fi_hash;    /* hash by "struct inode *" */
 	struct list_head        fi_stateids;
 	struct list_head	fi_delegations;
@@ -472,6 +473,7 @@ extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
 extern int nfsd4_create_callback_queue(void);
 extern void nfsd4_destroy_callback_queue(void);
 extern void nfsd4_shutdown_callback(struct nfs4_client *);
+extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
 							struct nfsd_net *nn);
-- 
1.9.3

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