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SubjectRe: patch to have root fs on USB device (please CC)

On Sun, Jun 02, 2002 at 10:13:22PM +0200, Paul Stoeber wrote:
> It simply sleeps 10 seconds before mount_block_root().
>
> I get an 'Unable to mount root' panic if I don't apply it,
> because the attached device rolls in too late.

A while ago I made the patch below. I retries every second until the root
device appears. Advantages:
- no delay when the device is already there
- it also works if it takes longer than 10s to find the harddisk
(for example, if you plug it in later)

I don't know if it applies cleanly to current kernels.

Eric

--- linux-2.4.14-pre8-ext3/fs/super.c.orig Fri Nov 16 00:59:18 2001
+++ linux-2.4.14-pre8-ext3/fs/super.c Fri Nov 16 01:07:26 2001
@@ -1009,11 +1009,13 @@
* Allow the user to distinguish between failed open
* and bad superblock on root device.
*/
- printk ("VFS: Cannot open root device \"%s\" or %s\n",
+ printk ("VFS: Cannot open root device \"%s\" or %s, retrying in 1s.\n",
root_device_name, kdevname (ROOT_DEV));
- printk ("Please append a correct \"root=\" boot option\n");
- panic("VFS: Unable to mount root fs on %s",
- kdevname(ROOT_DEV));
+
+ /* wait 1 second and try again */
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(HZ);
+ goto retry;
}

check_disk_change(ROOT_DEV);
-
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