ceph: fix bad parent_inode calc in ceph_lookup_open

We were always getting NULL here because the intent file f_dentry is always
NULL at this point, which means we were always passing NULL to
ceph_mdsc_do_request.  In reality, this was fine, since this isn't
currently ever a write operation that needs to get strung on the dir's
unsafe list.

Use the dir explicitly, and only pass it if this open has side-effects that
a dir fsync should flush.

Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 6c90cf09060..9b667e9abf4 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -223,7 +223,6 @@ struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
         struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
         struct ceph_mds_client *mdsc = fsc->mdsc;
         struct file *file = nd->intent.open.file;
-        struct inode *parent_inode = get_dentry_parent_inode(file->f_dentry);
         struct ceph_mds_request *req;
         int err;
         int flags = nd->intent.open.flags - 1;  /* silly vfs! */
@@ -242,7 +241,9 @@ struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
                 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
         }
         req->r_locked_dir = dir;           /* caller holds dir->i_mutex */
-        err = ceph_mdsc_do_request(mdsc, parent_inode, req);
+        err = ceph_mdsc_do_request(mdsc,
+                                   (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
+                                   req);
         dentry = ceph_finish_lookup(req, dentry, err);
         if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
                 err = ceph_handle_notrace_create(dir, dentry);