ceph: do not assume r_old_dentry[_dir] always set together

Do not assume that r_old_dentry implies that r_old_dentry_dir is also
true.  Separate out the ref cleanup and make the debugs dump behave when
it is NULL.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>

diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
index 6d59006..8c6f313 100644 (file)
--- a/fs/ceph/debugfs.c
+++ b/fs/ceph/debugfs.c
@@ -102,7 +102,8 @@ static int mdsc_show(struct seq_file *s, void *p)
                                path = NULL;
                        spin_lock(&req->r_old_dentry->d_lock);
                        seq_printf(s, " #%llx/%.*s (%s)",
-                          ceph_ino(req->r_old_dentry_dir),
+                                  req->r_old_dentry_dir ?
+                                  ceph_ino(req->r_old_dentry_dir) : 0,
                                   req->r_old_dentry->d_name.len,
                                   req->r_old_dentry->d_name.name,
                                   path ? path : "");

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index f4f050a..f260bd8 100644 (file)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -528,7 +528,9 @@ void ceph_mdsc_release_request(struct kref *kref)
                iput(req->r_target_inode);
        if (req->r_dentry)
                dput(req->r_dentry);
-       if (req->r_old_dentry) {
+       if (req->r_old_dentry)
+               dput(req->r_old_dentry);
+       if (req->r_old_dentry_dir) {
                /*
                 * track (and drop pins for) r_old_dentry_dir
                 * separately, since r_old_dentry's d_parent may have
@@ -537,7 +539,6 @@ void ceph_mdsc_release_request(struct kref *kref)
                 */
                ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
                                  CEPH_CAP_PIN);
-               dput(req->r_old_dentry);
                iput(req->r_old_dentry_dir);
        }
        kfree(req->r_path1);
@@ -2053,7 +2054,7 @@ int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
                ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
        if (req->r_locked_dir)
                ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
-       if (req->r_old_dentry)
+       if (req->r_old_dentry_dir)
                ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
                                  CEPH_CAP_PIN);