ceph: avoid inode lookup on nfs fh reconnect

If we get the inode from the MDS, we have a reference in req; don't do a
fresh lookup.

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/fs/ceph/export.c b/fs/ceph/export.c
index f1828af..a610d3d 100644 (file)
--- a/fs/ceph/export.c
+++ b/fs/ceph/export.c
@@ -107,8 +107,10 @@ static struct dentry *__fh_to_dentry(struct super_block *sb,
                req->r_ino1 = vino;
                req->r_num_caps = 1;
                err = ceph_mdsc_do_request(mdsc, NULL, req);
+               inode = req->r_target_inode;
+               if (inode)
+                       igrab(inode);
                ceph_mdsc_put_request(req);
-               inode = ceph_find_inode(sb, vino);
                if (!inode)
                        return ERR_PTR(-ESTALE);
        }
@@ -163,8 +165,10 @@ static struct dentry *__cfh_to_dentry(struct super_block *sb,
                snprintf(req->r_path2, 16, "%d", cfh->parent_name_hash);
                req->r_num_caps = 1;
                err = ceph_mdsc_do_request(mdsc, NULL, req);
+               inode = req->r_target_inode;
+               if (inode)
+                       igrab(inode);
                ceph_mdsc_put_request(req);
-               inode = ceph_find_inode(sb, vino);
                if (!inode)
                        return ERR_PTR(err ? err : -ESTALE);
        }