Missed file from previous checkin.

diff --git a/lib/device/dev-swap.c b/lib/device/dev-swap.c
new file mode 100644 (file)
index 0000000..62c2bb5
--- /dev/null
+++ b/lib/device/dev-swap.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2009 Red Hat, Inc. All rights reserved.
+ *
+ * This file is part of LVM2.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU Lesser General Public License v.2.1.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "lib.h"
+#include "metadata.h"
+#include "xlate.h"
+#include "filter.h"
+
+#ifdef linux
+
+#define MAX_PAGESIZE   (64 * 1024)
+#define SIGNATURE_SIZE  10
+
+static int
+_swap_detect_signature(const char *buf)
+{
+       if (memcmp(buf, "SWAP-SPACE", 10) == 0 ||
+            memcmp(buf, "SWAPSPACE2", 10) == 0)
+               return 1;
+
+       if (memcmp(buf, "S1SUSPEND", 9) == 0 ||
+           memcmp(buf, "S2SUSPEND", 9) == 0 ||
+           memcmp(buf, "ULSUSPEND", 9) == 0 ||
+           memcmp(buf, "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8) == 0)
+               return 1;
+
+       return 0;
+}
+
+int dev_is_swap(struct device *dev, uint64_t *signature)
+{
+       char buf[10];
+       uint64_t size;
+       int page;
+
+       if (!dev_get_size(dev, &size)) {
+               stack;
+               return -1;
+       }
+
+       if (!dev_open(dev)) {
+               stack;
+               return -1;
+       }
+
+       *signature = 0;
+
+       for (page = 0x1000; page <= MAX_PAGESIZE; page <<= 1) {
+               /*
+                * skip 32k pagesize since this does not seem to be supported
+                */
+               if (page == 0x8000)
+                       continue;
+               if (size < page)
+                       break;
+               if (!dev_read(dev, page - SIGNATURE_SIZE,
+                             SIGNATURE_SIZE, buf)) {
+                       stack;
+                       return -1;
+               }
+               if (_swap_detect_signature(buf)) {
+                       *signature = page - SIGNATURE_SIZE;
+                       break;
+               }
+       }
+
+       if (!dev_close(dev))
+               stack;
+
+       if (*signature)
+               return 1;
+
+       return 0;
+}
+
+#endif