I have attached a patch adding a program that allows re-reading the partition table...

diff --git a/toys/pending/partprobe.c b/toys/pending/partprobe.c
new file mode 100644 (file)
index 0000000..2fe3bd5
--- /dev/null
+++ b/toys/pending/partprobe.c
@@ -0,0 +1,51 @@
+/* partprobe.c - Tell the kernel about partition table changes
+ *
+ * Copyright 2014 Bertold Van den Bergh <vandenbergh@bertold.org>
+ *
+ * see http://man7.org/linux/man-pages/man8/partprobe.8.html
+
+USE_PARTPROBE(NEWTOY(partprobe, NULL, TOYFLAG_SBIN))
+
+config PARTPROBE
+  bool "partprobe"
+  default n
+  help
+    partprobe - Tell the kernel about partition table changes
+       
+    usage: partprobe [devices...]
+
+    Asks the kernel to re-read the partition table on the specified
+    devices.
+*/
+
+#include "toys.h"
+
+void update_device(char* path)
+{
+  int sd_fd = open(path, 0);
+  
+  if(sd_fd < 0){
+       perror_msg("Unable to open %s", path);
+       return;
+  }
+  
+  if(ioctl(sd_fd, BLKRRPART, NULL) < 0)
+    perror_msg("ioctl (BLKRRPART) failed, old layout still used");
+  
+  close(sd_fd);
+}
+
+void partprobe_main(void)
+{
+  char** opt; 
+  if(*toys.optargs == NULL){
+    printf("No devices specified.\n");
+    exit(EXIT_FAILURE);
+  }
+  
+  for (opt = toys.optargs; *opt; opt++) {
+    update_device(*opt);
+  }
+  
+  exit(EXIT_SUCCESS);
+}