1 files changed, 63 insertions, 0 deletions

diff --git a/fs/xfs/uuid.c b/fs/xfs/uuid.c
new file mode 100644
index 000000000000..b83f76b6d410
--- /dev/null
+++ b/fs/xfs/uuid.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <xfs.h>
+
+/* IRIX interpretation of an uuid_t */
+typedef struct {
+        __be32  uu_timelow;
+        __be16  uu_timemid;
+        __be16  uu_timehi;
+        __be16  uu_clockseq;
+        __be16  uu_node[3];
+} xfs_uu_t;
+
+/*
+ * uuid_getnodeuniq - obtain the node unique fields of a UUID.
+ *
+ * This is not in any way a standard or condoned UUID function;
+ * it just something that's needed for user-level file handles.
+ */
+void
+uuid_getnodeuniq(uuid_t *uuid, int fsid [2])
+{
+        xfs_uu_t *uup = (xfs_uu_t *)uuid;
+
+        fsid[0] = (be16_to_cpu(uup->uu_clockseq) << 16) |
+                   be16_to_cpu(uup->uu_timemid);
+        fsid[1] = be32_to_cpu(uup->uu_timelow);
+}
+
+int
+uuid_is_nil(uuid_t *uuid)
+{
+        int     i;
+        char    *cp = (char *)uuid;
+
+        if (uuid == NULL)
+                return 0;
+        /* implied check of version number here... */
+        for (i = 0; i < sizeof *uuid; i++)
+                if (*cp++) return 0;    /* not nil */
+        return 1;       /* is nil */
+}
+
+int
+uuid_equal(uuid_t *uuid1, uuid_t *uuid2)
+{
+        return memcmp(uuid1, uuid2, sizeof(uuid_t)) ? 0 : 1;
+}