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authorDavid S. Miller <davem@davemloft.net>2011-09-22 03:23:13 -0400
committerDavid S. Miller <davem@davemloft.net>2011-09-22 03:23:13 -0400
commit8decf868790b48a727d7e7ca164f2bcd3c1389c0 (patch)
treeb759a5f861f842af7ea76f9011b579d06e9d5508 /fs/xfs/uuid.c
parent3fc72370186be2f9d4d6ef06d99e1caa5d92c564 (diff)
parentd93dc5c4478c1fd5de85a3e8aece9aad7bbae044 (diff)
Merge branch 'master' of github.com:davem330/net
Conflicts: MAINTAINERS drivers/net/Kconfig drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c drivers/net/ethernet/broadcom/tg3.c drivers/net/wireless/iwlwifi/iwl-pci.c drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c drivers/net/wireless/rt2x00/rt2800usb.c drivers/net/wireless/wl12xx/main.c
Diffstat (limited to 'fs/xfs/uuid.c')
-rw-r--r--fs/xfs/uuid.c63
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;
+}