From: Jeff Layton <jlayton@kernel.org>
Date: Mon, 14 Jun 2021 19:38:39 +0000 (-0400)
Subject: ceph: don't take s_mutex in ceph_flush_snaps
X-Git-Tag: accepted/tizen/unified/20230118.172025~6860^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7732fe168edaea825ed65954712c825f4625f2ba;p=platform%2Fkernel%2Flinux-rpi.git

ceph: don't take s_mutex in ceph_flush_snaps

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Luis Henriques <lhenriques@suse.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 6fae3cb..3fe9ea3 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1531,7 +1531,7 @@ static inline int __send_flush_snap(struct inode *inode,
  * asynchronously back to the MDS once sync writes complete and dirty
  * data is written out.
  *
- * Called under i_ceph_lock.  Takes s_mutex as needed.
+ * Called under i_ceph_lock.
  */
 static void __ceph_flush_snaps(struct ceph_inode_info *ci,
 			       struct ceph_mds_session *session)
@@ -1653,7 +1653,6 @@ retry:
 	mds = ci->i_auth_cap->session->s_mds;
 	if (session && session->s_mds != mds) {
 		dout(" oops, wrong session %p mutex\n", session);
-		mutex_unlock(&session->s_mutex);
 		ceph_put_mds_session(session);
 		session = NULL;
 	}
@@ -1662,10 +1661,6 @@ retry:
 		mutex_lock(&mdsc->mutex);
 		session = __ceph_lookup_mds_session(mdsc, mds);
 		mutex_unlock(&mdsc->mutex);
-		if (session) {
-			dout(" inverting session/ino locks on %p\n", session);
-			mutex_lock(&session->s_mutex);
-		}
 		goto retry;
 	}
 
@@ -1677,12 +1672,10 @@ retry:
 out:
 	spin_unlock(&ci->i_ceph_lock);
 
-	if (psession) {
+	if (psession)
 		*psession = session;
-	} else if (session) {
-		mutex_unlock(&session->s_mutex);
+	else
 		ceph_put_mds_session(session);
-	}
 	/* we flushed them all; remove this inode from the queue */
 	spin_lock(&mdsc->snap_flush_lock);
 	list_del_init(&ci->i_snap_flush_item);
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index f8cac2a..8ca95d1 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -846,10 +846,7 @@ static void flush_snaps(struct ceph_mds_client *mdsc)
 	}
 	spin_unlock(&mdsc->snap_flush_lock);
 
-	if (session) {
-		mutex_unlock(&session->s_mutex);
-		ceph_put_mds_session(session);
-	}
+	ceph_put_mds_session(session);
 	dout("flush_snaps done\n");
 }