From: "J.C. Wren" <jcwren@jcwren.com>
To: linux-hotplug@vger.kernel.org
Subject: udev synchronization problems
Date: Thu, 15 Sep 2005 01:50:04 +0000 [thread overview]
Message-ID: <4328D34C.7070008@jcwren.com> (raw)
Forgive me if this has been addressed before. I did some googling
for answers, but either there are none, or more likely, I am not using
the correct search terms for useful results.
I have a script to create compact flash cards for an application.
It worked well until I switched from devfs to udev.
The script is pretty basic. sfdisk, mke2fs, tune2fs, mount, cp,
umount. I run into errors where sfdisk completes, then mke2fs complains
that /dev/hde1 (hde is the PCMCIA CF card) doesn't exist. Or sometimes
it gets past that, and tune2fs complains /dev/hde1 doesn't exist.
As near as I can tell, it's because udevd doesn't react fast enough
(from my scripts perspective) and present /dev/hde1 once it's been
created. So I tried a few things. I put a loop in the script waiting
for /dev/hde1 to become present. Didn't fix it. Added some 'sleep 1'
commands. Didn't fix it. Tried a while loop that waited for /dev/hde1
to become present in /proc/partitions. Didn't fix it. However, running
these commands by hand almost always succeed.
Is there some reliable way to determine that /dev/hde1 is *really*
there, and ready for action?
I've tried 2.6.12-gentoo-r10, 2.6.13 (vanilla), both against udev
068 and 069.
I've been through the udev utilities, didn't see anything that
looked like it was what I neeed. Is there a handy command that makes
sure things are flushed and updated before the next action can take place?
I'll cheerfully take a solution, or go back to Google if someone can
tell me what sort of search terms would be relevant.
Thanks,
--jc
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next reply other threads:[~2005-09-15 1:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-15 1:50 J.C. Wren [this message]
2005-09-15 15:34 ` udev synchronization problems Kay Sievers
2005-09-19 16:51 ` J.C. Wren
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