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From: Jeff Layton <jlayton@kernel.org>
To: ceph-devel@vger.kernel.org, idryomov@gmail.com
Subject: [PATCH 1/3] ceph: add some lockdep assertions around snaprealm handling
Date: Thu,  3 Jun 2021 12:52:29 -0400	[thread overview]
Message-ID: <20210603165231.110559-2-jlayton@kernel.org> (raw)
In-Reply-To: <20210603165231.110559-1-jlayton@kernel.org>

Turn some comments into lockdep asserts.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/snap.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index 2a63fb37778b..bc6c33d485e6 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -65,6 +65,8 @@
 void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
 			 struct ceph_snap_realm *realm)
 {
+	lockdep_assert_held_write(&mdsc->snap_rwsem);
+
 	dout("get_realm %p %d -> %d\n", realm,
 	     atomic_read(&realm->nref), atomic_read(&realm->nref)+1);
 	/*
@@ -113,6 +115,8 @@ static struct ceph_snap_realm *ceph_create_snap_realm(
 {
 	struct ceph_snap_realm *realm;
 
+	lockdep_assert_held_write(&mdsc->snap_rwsem);
+
 	realm = kzalloc(sizeof(*realm), GFP_NOFS);
 	if (!realm)
 		return ERR_PTR(-ENOMEM);
@@ -143,6 +147,8 @@ static struct ceph_snap_realm *__lookup_snap_realm(struct ceph_mds_client *mdsc,
 	struct rb_node *n = mdsc->snap_realms.rb_node;
 	struct ceph_snap_realm *r;
 
+	lockdep_assert_held_write(&mdsc->snap_rwsem);
+
 	while (n) {
 		r = rb_entry(n, struct ceph_snap_realm, node);
 		if (ino < r->ino)
@@ -176,6 +182,8 @@ static void __put_snap_realm(struct ceph_mds_client *mdsc,
 static void __destroy_snap_realm(struct ceph_mds_client *mdsc,
 				 struct ceph_snap_realm *realm)
 {
+	lockdep_assert_held_write(&mdsc->snap_rwsem);
+
 	dout("__destroy_snap_realm %p %llx\n", realm, realm->ino);
 
 	rb_erase(&realm->node, &mdsc->snap_realms);
@@ -198,6 +206,8 @@ static void __destroy_snap_realm(struct ceph_mds_client *mdsc,
 static void __put_snap_realm(struct ceph_mds_client *mdsc,
 			     struct ceph_snap_realm *realm)
 {
+	lockdep_assert_held_write(&mdsc->snap_rwsem);
+
 	dout("__put_snap_realm %llx %p %d -> %d\n", realm->ino, realm,
 	     atomic_read(&realm->nref), atomic_read(&realm->nref)-1);
 	if (atomic_dec_and_test(&realm->nref))
@@ -236,6 +246,8 @@ static void __cleanup_empty_realms(struct ceph_mds_client *mdsc)
 {
 	struct ceph_snap_realm *realm;
 
+	lockdep_assert_held_write(&mdsc->snap_rwsem);
+
 	spin_lock(&mdsc->snap_empty_lock);
 	while (!list_empty(&mdsc->snap_empty)) {
 		realm = list_first_entry(&mdsc->snap_empty,
@@ -269,6 +281,8 @@ static int adjust_snap_realm_parent(struct ceph_mds_client *mdsc,
 {
 	struct ceph_snap_realm *parent;
 
+	lockdep_assert_held_write(&mdsc->snap_rwsem);
+
 	if (realm->parent_ino == parentino)
 		return 0;
 
@@ -696,6 +710,8 @@ int ceph_update_snap_trace(struct ceph_mds_client *mdsc,
 	int err = -ENOMEM;
 	LIST_HEAD(dirty_realms);
 
+	lockdep_assert_held_write(&mdsc->snap_rwsem);
+
 	dout("update_snap_trace deletion=%d\n", deletion);
 more:
 	ceph_decode_need(&p, e, sizeof(*ri), bad);
-- 
2.31.1


  reply	other threads:[~2021-06-03 16:52 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-03 16:52 [PATCH 0/3] ceph: locking fixes for " Jeff Layton
2021-06-03 16:52 ` Jeff Layton [this message]
2021-06-21 20:05   ` [PATCH 1/3] ceph: add some lockdep assertions around " Ilya Dryomov
2021-06-21 20:51     ` Jeff Layton
2021-06-21 21:27       ` Ilya Dryomov
2021-06-03 16:52 ` [PATCH 2/3] ceph: clean up locking annotation for ceph_get_snap_realm and __lookup_snap_realm Jeff Layton
2021-06-21 20:48   ` Ilya Dryomov
2021-06-03 16:52 ` [PATCH 3/3] ceph: must hold snap_rwsem when filling inode for async create Jeff Layton
2021-06-21 19:45   ` Ilya Dryomov

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