[PATCH] ceph: fix dout logs for null pointers

[xiubli@redhat.com]

From: Xiubo Li <xiubli@redhat.com>

For example, if dentry and inode is NULL, the log will be:
ceph:  lookup result=000000007a1ca695
ceph:  submit_request on 0000000041d5070e for inode 000000007a1ca695

The will be confusing without checking the corresponding code carefully.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 fs/ceph/dir.c        | 2 +-
 fs/ceph/mds_client.c | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index ffeaff5bf211..245a262ec198 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -798,7 +798,7 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
 	err = ceph_handle_snapdir(req, dentry, err);
 	dentry = ceph_finish_lookup(req, dentry, err);
 	ceph_mdsc_put_request(req);  /* will dput(dentry) */
-	dout("lookup result=%p\n", dentry);
+	dout("lookup result=%d\n", err);
 	return dentry;
 }
 
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index b6aa357f7c61..e34f159d262b 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2772,7 +2772,11 @@ int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
 		ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
 				  CEPH_CAP_PIN);
 
-	dout("submit_request on %p for inode %p\n", req, dir);
+	if (dir)
+		dout("submit_request on %p for inode %p\n", req, dir);
+	else
+		dout("submit_request on %p\n", req);
+
 	mutex_lock(&mdsc->mutex);
 	__register_request(mdsc, req, dir);
 	__do_request(mdsc, req);
-- 
2.21.0