Add debugging printf to blkid's probe routine when original fs type failed

This particular bit of code has caused problems before, so make it
easier to debug problems caused by the probe verification looping
forever here.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/lib/blkid/probe.c b/lib/blkid/probe.c
index b5bcdcf..69a43b0 100644 (file)
--- a/lib/blkid/probe.c
+++ b/lib/blkid/probe.c
@@ -999,6 +999,9 @@ try_again:
                /*
                 * Zap the device filesystem information and try again
                 */
+               DBG(DEBUG_PROBE,
+                   printf("previous fs type %s not valid, "
+                          "trying full probe\n", dev->bid_type));
                iter = blkid_tag_iterate_begin(dev);
                while (blkid_tag_next(iter, &type, &value) == 0)
                        blkid_set_tag(dev, type, 0, 0);