commit 3635fcf3f7358f006a5025b9773034088bdd01fd
Author: Goffredo Baroncelli <kreijack@inwind.it>
Date:   Fri Oct 21 19:00:28 2011 +0200

    Ignore the error ENXIO and ENOMEDIUM during a devs scan
    
    Ignore the error ENXIO (device don't exists) and ENOMEDIUM (
    No medium found -> like a cd tray empty) in the function
    btrfs_scan_one_dir.
    This avoids spurios errors due to an empty CD or a block device node
    without a device (which is frequent in a static /dev).
    
    
    Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>

diff --git a/utils.c b/utils.c
index 86c643c..5761e47 100644
--- a/utils.c
+++ b/utils.c
@@ -997,8 +997,14 @@ again:
 		}
 		fd = open(fullpath, O_RDONLY);
 		if (fd < 0) {
-			fprintf(stderr, "failed to read %s: %s\n", fullpath,
-					strerror(errno));
+			/* ignore the following errors:
+				ENXIO (device don't exists) 
+				ENOMEDIUM (No medium found -> 
+					like a cd tray empty)
+			*/
+			if(errno != ENXIO && errno != ENOMEDIUM) 
+				fprintf(stderr, "failed to read %s: %s\n", 
+					fullpath, strerror(errno));
 			continue;
 		}
 		ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,