cifs: add fallback in is_path_accessible for old servers

commit 221d1d797202984cb874e3ed9f1388593d34ee22 upstream.

The is_path_accessible check uses a QPathInfo call, which isn't
supported by ancient win9x era servers. Fall back to an older
SMBQueryInfo call if it fails with the magic error codes.

Reported-and-Tested-by: Sandro Bonazzola <sandro.bonazzola@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index eb4c181a38f76a1def5ff9965956c243d4f42a2d..1e2d82a3a0f9067050fbb117d01371e9612ffcc8 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2253,6 +2253,11 @@ is_path_accessible(int xid, struct cifsTconInfo *tcon,
                              0 /* not legacy */, cifs_sb->local_nls,
                              cifs_sb->mnt_cifs_flags &
                                CIFS_MOUNT_MAP_SPECIAL_CHR);
+
+       if (rc == -EOPNOTSUPP || rc == -EINVAL)
+               rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
+                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
+                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
        kfree(pfile_info);
        return rc;
 }