Hi,
I've been chasing an intermittent problem with busybox's fdisk
implementation. About one command in ten was failing on me when used
with slow external USB disks on a 320MHz ARM system. The BLKRRPART
ioctl was returning device busy.
I traced it to a commented out sleep(2) in fdisk.c. With the sleep
reinstated fdisk is reliable.
I know that linux sync() is documented as not returning until the buffers
have been flushed but I think something is delaying them, possibly in the
USB stack.
--- busybox-1.18.3/util-linux/fdisk.c-orig 2011-07-11 14:51:15.000000000
+0100
+++ busybox-1.18.3/util-linux/fdisk.c 2011-07-11 14:51:52.000000000 +0100
@@ -2564,7 +2564,7 @@
printf("Calling ioctl() to re-read partition table\n");
sync();
- /* sleep(2); Huh? */
+ sleep(2);
i = ioctl_or_perror(dev_fd, BLKRRPART, NULL,
"WARNING: rereading partition table "
"failed, kernel still uses old table");
--
Bob Dunlop
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