+/*
+ * Open the directory at the root of a share
+ */
+int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
+{
+ struct cifs_open_parms oparams;
+ int rc;
+ __le16 srch_path = 0; /* Null - since an open of top of share */
+ u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+
+ mutex_lock(&tcon->prfid_mutex);
+ if (tcon->valid_root_fid) {
+ cifs_dbg(FYI, "found a cached root file handle\n");
+ memcpy(pfid, tcon->prfid, sizeof(struct cifs_fid));
+ mutex_unlock(&tcon->prfid_mutex);
+ return 0;
+ }
+
+ oparams.tcon = tcon;
+ oparams.create_options = 0;
+ oparams.desired_access = FILE_READ_ATTRIBUTES;
+ oparams.disposition = FILE_OPEN;
+ oparams.fid = pfid;
+ oparams.reconnect = false;
+
+ rc = SMB2_open(xid, &oparams, &srch_path, &oplock, NULL, NULL);
+ if (rc == 0) {
+ memcpy(tcon->prfid, pfid, sizeof(struct cifs_fid));
+ tcon->valid_root_fid = true;
+ }
+ mutex_unlock(&tcon->prfid_mutex);
+ return rc;
+}
+