[Cluster-devel] [RFC dlm/next 08/10] fs: dlm: ls_recv_active semaphore to rwlock

[Alexander Aring <aahringo@redhat.com>]

This patch converts the ls_recv_active semaphore to a rwlock to not
sleep during dlm message processing.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
---
 fs/dlm/dlm_internal.h | 2 +-
 fs/dlm/lock.c         | 4 ++--
 fs/dlm/lockspace.c    | 2 +-
 fs/dlm/member.c       | 4 ++--
 fs/dlm/recoverd.c     | 4 ++--
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index 9106e20e6c20..6a1b2c806f72 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -622,7 +622,7 @@ struct dlm_ls {
 	uint64_t		ls_recover_seq;
 	struct dlm_recover	*ls_recover_args;
 	struct rw_semaphore	ls_in_recovery;	/* block local requests */
-	struct rw_semaphore	ls_recv_active;	/* block dlm_recv */
+	rwlock_t		ls_recv_active;	/* block dlm_recv */
 	struct list_head	ls_requestqueue;/* queue remote requests */
 	rwlock_t		ls_requestqueue_lock;
 	struct dlm_rcom		*ls_recover_buf;
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 1031f233a3ad..dccc0b888ca1 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -4831,7 +4831,7 @@ void dlm_receive_buffer(const union dlm_packet *p, int nodeid)
 	/* this rwsem allows dlm_ls_stop() to wait for all dlm_recv threads to
 	   be inactive (in this ls) before transitioning to recovery mode */
 
-	down_read(&ls->ls_recv_active);
+	read_lock(&ls->ls_recv_active);
 	if (hd->h_cmd == DLM_MSG)
 		dlm_receive_message(ls, &p->message, nodeid);
 	else if (hd->h_cmd == DLM_RCOM)
@@ -4839,7 +4839,7 @@ void dlm_receive_buffer(const union dlm_packet *p, int nodeid)
 	else
 		log_error(ls, "invalid h_cmd %d from %d lockspace %x",
 			  hd->h_cmd, nodeid, le32_to_cpu(hd->u.h_lockspace));
-	up_read(&ls->ls_recv_active);
+	read_unlock(&ls->ls_recv_active);
 
 	dlm_put_lockspace(ls);
 }
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index 265d69752b90..e35ea06200b5 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -552,7 +552,7 @@ static int new_lockspace(const char *name, const char *cluster,
 	ls->ls_recover_seq = get_random_u64();
 	ls->ls_recover_args = NULL;
 	init_rwsem(&ls->ls_in_recovery);
-	init_rwsem(&ls->ls_recv_active);
+	rwlock_init(&ls->ls_recv_active);
 	INIT_LIST_HEAD(&ls->ls_requestqueue);
 	rwlock_init(&ls->ls_requestqueue_lock);
 	spin_lock_init(&ls->ls_clear_proc_locks);
diff --git a/fs/dlm/member.c b/fs/dlm/member.c
index 707cebcdc533..ac1b555af9d6 100644
--- a/fs/dlm/member.c
+++ b/fs/dlm/member.c
@@ -630,7 +630,7 @@ int dlm_ls_stop(struct dlm_ls *ls)
 	 * message to the requestqueue without races.
 	 */
 
-	down_write(&ls->ls_recv_active);
+	write_lock(&ls->ls_recv_active);
 
 	/*
 	 * Abort any recovery that's in progress (see RECOVER_STOP,
@@ -654,7 +654,7 @@ int dlm_ls_stop(struct dlm_ls *ls)
 	 * requestqueue for later.
 	 */
 
-	up_write(&ls->ls_recv_active);
+	write_unlock(&ls->ls_recv_active);
 
 	/*
 	 * This in_recovery lock does two things:
diff --git a/fs/dlm/recoverd.c b/fs/dlm/recoverd.c
index 4d17491dea2f..c47bcc8be398 100644
--- a/fs/dlm/recoverd.c
+++ b/fs/dlm/recoverd.c
@@ -32,7 +32,7 @@ static int enable_locking(struct dlm_ls *ls, uint64_t seq)
 {
 	int error = -EINTR;
 
-	down_write(&ls->ls_recv_active);
+	write_lock(&ls->ls_recv_active);
 
 	spin_lock(&ls->ls_recover_lock);
 	if (ls->ls_recover_seq == seq) {
@@ -44,7 +44,7 @@ static int enable_locking(struct dlm_ls *ls, uint64_t seq)
 	}
 	spin_unlock(&ls->ls_recover_lock);
 
-	up_write(&ls->ls_recv_active);
+	write_unlock(&ls->ls_recv_active);
 	return error;
 }
 
-- 
2.31.1