Date: Sun, 20 Nov 2005 21:04:59 +0000 From: Brian Candler <B.Candler@pobox.com> To: freebsd-stable@freebsd.org Subject: Re: CF card and /dev filesystem entries Message-ID: <20051120210459.GA19861@uk.tiscali.com> In-Reply-To: <20051116165712.GB33710@slackbox.xs4all.nl> References: <20051116101200.GA2823@uk.tiscali.com> <20051116165712.GB33710@slackbox.xs4all.nl>
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On Wed, Nov 16, 2005 at 05:57:12PM +0100, Roland Smith wrote: > > However, when I insert a CF card with normal partioning I need /dev/da0s1, > > and this is not present in the /dev filesystem because the partition table > > has not been read. > <snip> > > The only way I can see to *force* the superblock to be read is to attempt to > > mount the whole device as if it were unpartitioned. This is sufficient to > > cause the /dev/da0s1 entry to appear in the /dev filesystem. > <snip> > > At this point, everything works as expected. > > > > My question is: is there an easier or more direct way to cause the partition > > table of the CF card to be read and the /dev filesystem to update? > > Try 'camcontrol rescan all' (as root). No joy. root@billdog brian# ls /dev/da0* /dev/da0 root@billdog brian# camcontrol rescan all Re-scan of bus 0 was successful Re-scan of bus 1 was successful Re-scan of bus 2 was successful Re-scan of bus 3 was successful root@billdog brian# ls /dev/da0* /dev/da0 Another suggestion was: > I think devfs is updated when a descriptor on the device > which was opended for writing is closed. But you don't > actually have to write anything. That means, the following > command should do it: > > # dd if=/dev/null of=/dev/da0 count=0 Now, that does the job: root@billdog brian# dd if=/dev/null of=/dev/da0 count=0 0+0 records in 0+0 records out 0 bytes transferred in 0.000028 secs (0 bytes/sec) root@billdog brian# ls -l /dev/da0* crw-r----- 1 root operator 0, 107 Nov 20 21:00 /dev/da0 crw-r----- 1 root operator 0, 115 Nov 20 21:00 /dev/da0s1 root@billdog brian# However, I'm not sure I actually *like* opening my CF card in such a way that I would be likely to overwrite the partition table if I hit a wrong key... Regards, Brian.
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