[PATCH][QEMU] Logdirty debug cleanup

[Ben Guthro <bguthro@virtualiron.com>]

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Restructure and add some debug messages around mapping the logdirty 
bitmap to
make it clearer which operation is failing.

Signed-off-by: Ben Guthro <bguthro@virtualron.com>
Signed-off-by: Gary Grebus <ggrebus@virtualiron.com>

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diff -r 34e634f6743d tools/ioemu/xenstore.c
--- a/tools/ioemu/xenstore.c	Mon Aug 06 15:30:36 2007 -0400
+++ b/tools/ioemu/xenstore.c	Mon Aug 06 15:30:36 2007 -0400
@@ -296,14 +296,21 @@ void xenstore_process_logdirty_event(voi
         logdirty_bitmap_size *= sizeof (unsigned long); /* bytes */
 
         /* Map the shared-memory segment */
-        if ((shmid = shmget(key, 
-                            2 * logdirty_bitmap_size, 
-                            S_IRUSR|S_IWUSR)) == -1 
-            || (seg = shmat(shmid, NULL, 0)) == (void *)-1) {
-            fprintf(logfile, "Log-dirty: can't map segment %16.16llx (%s)\n",
+	fprintf(logfile, "%s: key=%16.16llx size=%d\n", __FUNCTION__,
+		(unsigned long long)key, logdirty_bitmap_size);
+        shmid = shmget(key, 2 * logdirty_bitmap_size, S_IRUSR|S_IWUSR);
+	if (shmid == -1) {
+            fprintf(logfile, "Log-dirty: shmget failed: segment %16.16llx (%s)\n",
                     (unsigned long long) key, strerror(errno));
-            exit(1);
-        }
+	    exit(1);
+	}
+
+	seg = shmat(shmid, NULL, 0);
+	if (seg == (void *)-1) {
+            fprintf(logfile, "Log-dirty: shmat failed: segment %16.16llx (%s)\n",
+                    (unsigned long long) key, strerror(errno));
+	    exit(1);
+	}
 
         fprintf(logfile, "Log-dirty: mapped segment at %p\n", seg);
 

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