Index: uspace/srv/bd/file_bd/file_bd.c
===================================================================
--- uspace/srv/bd/file_bd/file_bd.c	(revision fbbbb8aad83e159be5cdecf2d81e66df39150468)
+++ uspace/srv/bd/file_bd/file_bd.c	(revision 2dfd9fabc80d64906587ad9bcece47989019be15)
@@ -45,5 +45,5 @@
 #include <async.h>
 #include <as.h>
-#include <futex.h>
+#include <fibril_sync.h>
 #include <devmap.h>
 #include <sys/types.h>
@@ -57,5 +57,5 @@
 
 static dev_handle_t dev_handle;
-static atomic_t dev_futex = FUTEX_INITIALIZER;
+static fibril_mutex_t dev_lock;
 
 static int file_bd_init(const char *fname);
@@ -106,4 +106,6 @@
 	if (img == NULL)
 		return EINVAL;
+
+	fibril_mutex_initialize(&dev_lock);
 
 	return EOK;
@@ -170,21 +172,15 @@
 	size_t n_rd;
 
-	printf("file_bd_read\n");
-	futex_down(&dev_futex);
-
-	printf("seek\n");
+	fibril_mutex_lock(&dev_lock);
+
 	fseek(img, blk_idx * size, SEEK_SET);
-	printf("read\n");
 	n_rd = fread(buf, 1, size, img);
-	printf("done\n");
-
-	printf("done\n");
 
 	if (ferror(img)) {
-		futex_up(&dev_futex);
+		fibril_mutex_unlock(&dev_lock);
 		return EIO;	/* Read error */
 	}
 
-	futex_up(&dev_futex);
+	fibril_mutex_unlock(&dev_lock);
 
 	if (n_rd < size) 
@@ -198,5 +194,5 @@
 	size_t n_wr;
 
-	futex_down(&dev_futex);
+	fibril_mutex_lock(&dev_lock);
 
 	fseek(img, blk_idx * size, SEEK_SET);
@@ -204,9 +200,9 @@
 
 	if (ferror(img) || n_wr < size) {
-		futex_up(&dev_futex);
+		fibril_mutex_unlock(&dev_lock);
 		return EIO;	/* Write error */
 	}
 
-	futex_up(&dev_futex);
+	fibril_mutex_unlock(&dev_lock);
 
 	return EOK;