From: "Andreas Hartmetz" <ahartmetz@web.de>
To: linux-hotplug@vger.kernel.org
Subject: Multi-card drive & partition nodes
Date: Tue, 14 Dec 2004 07:16:46 +0000 [thread overview]
Message-ID: <1805884928@web.de> (raw)
Hi list!
(system is debian-unstable latest)
I am having the following problem with my USB multi card reader:
When I plug it in, udev creates the /dev/sda to /dev/sdd nodes but
(of course) no partitions /dev/sd[a-d]n.
Now, when I insert e.g. a partitioned CompactFlash medium, there
is no device node for it and I cannot use it.
Note that this is exactly what multi-card drives are made for...
I have got some suggestions how it could be done:
-quick&dirty&crap, the "traditional" way: create some partition
nodes with any drive node. if there are too many partitions
on a single drive, user is out of luck. Ugly.
-if the [sd/hd]x node exists and partition [sd/hf]xn is tried to open,
look quick if the partition does exist. I personally think this is a good
way to do it because, as opposed to the auto-driver-loading in
devfs, no big and/or dangerous operation is necessary to find out.
Somewhat ugly, no doubt.
Probably the best solution for a non-perfect world where el cheapo
companies create stuff that "Works with Windows" (tm).
-try to get noticed of media changes and re-read partition info.
Create partition nodes accordingly.
Elegant and best adapted to the problem, but perhaps impossible.
Card reader _needs_ to tell OS "media change there-and-there"
for this to work. In a perfect world, the perfect solution ;)
I hope that I posted to the right list for this ;)
Regards, Andreas
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next reply other threads:[~2004-12-14 7:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-14 7:16 Andreas Hartmetz [this message]
2004-12-14 8:40 ` Multi-card drive & partition nodes Marco d'Itri
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