ceph: pass parent dir ino info to build_dentry_path

In the event that we have a parent inode reference in the request, we
can use that instead of mucking about in the dcache. Pass any parent
inode info we have down to build_dentry_path so it can make use of it.

Link: http://tracker.ceph.com/issues/18148
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Yan, Zheng <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 7c2eb28..c41c6aa 100644 (file)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1795,15 +1795,15 @@ retry:
        return path;
 }
 
-static int build_dentry_path(struct dentry *dentry,
+static int build_dentry_path(struct dentry *dentry, struct inode *dir,
                             const char **ppath, int *ppathlen, u64 *pino,
                             int *pfreepath)
 {
        char *path;
-       struct inode *dir;
 
        rcu_read_lock();
-       dir = d_inode_rcu(dentry->d_parent);
+       if (!dir)
+               dir = d_inode_rcu(dentry->d_parent);
        if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
                *pino = ceph_ino(dir);
                rcu_read_unlock();
@@ -1847,8 +1847,8 @@ static int build_inode_path(struct inode *inode,
  * an explicit ino+path.
  */
 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
-                                 const char *rpath, u64 rino,
-                                 const char **ppath, int *pathlen,
+                                 struct inode *rdiri, const char *rpath,
+                                 u64 rino, const char **ppath, int *pathlen,
                                  u64 *ino, int *freepath)
 {
        int r = 0;
@@ -1858,7 +1858,8 @@ static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
                dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
                     ceph_snap(rinode));
        } else if (rdentry) {
-               r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
+               r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
+                                       freepath);
                dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
                     *ppath);
        } else if (rpath || rino) {
@@ -1891,7 +1892,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
        int ret;
 
        ret = set_request_path_attr(req->r_inode, req->r_dentry,
-                             req->r_path1, req->r_ino1.ino,
+                             req->r_locked_dir, req->r_path1, req->r_ino1.ino,
                              &path1, &pathlen1, &ino1, &freepath1);
        if (ret < 0) {
                msg = ERR_PTR(ret);
@@ -1899,6 +1900,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
        }
 
        ret = set_request_path_attr(NULL, req->r_old_dentry,
+                             req->r_old_dentry_dir,
                              req->r_path2, req->r_ino2.ino,
                              &path2, &pathlen2, &ino2, &freepath2);
        if (ret < 0) {