Date: Wed, 22 Jul 2009 12:10:26 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: SCSI device not created upon a CF card plug in Message-ID: <h46oih$eh5$1@ger.gmane.org> In-Reply-To: <200907221132.35462.freebsd-stable@dino.sk> References: <20090722022027.12059.qmail@us1.tomahawkonline.net> <200907220759.22608.freebsd-stable@dino.sk> <h46fma$k5q$1@ger.gmane.org> <200907221132.35462.freebsd-stable@dino.sk>
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Milan Obuch wrote: > On Wednesday 22 July 2009 09:38:50 Ivan Voras wrote: > > [ snip ] > >>>> After the CF card is plugged in: >>>> $ ls -l /dev/ | grep da >>>> crw-r----- 1 root operator 0, 105 Jul 22 13:18 da0 >>>> crw-r----- 1 root operator 0, 106 Jul 22 13:18 da1 >>>> crw-r----- 1 root operator 0, 107 Jul 22 13:18 da2 >>>> crw-r----- 1 root operator 0, 108 Jul 22 13:18 da3 >>>> >>>> After reboot while the CF card is plugged in: >>>> $ ls -l /dev/ | grep da >>>> crw-r----- 1 root operator 0, 105 Jul 22 13:24 da0 >>>> crw-r----- 1 root operator 0, 106 Jul 22 13:24 da1 >>>> crw-r----- 1 root operator 0, 110 Jul 22 13:24 da1s1 >>>> crw-r----- 1 root operator 0, 107 Jul 22 13:24 da2 >>>> crw-r----- 1 root operator 0, 108 Jul 22 13:24 da3 >>>> >>>> My questions in this regards are: >>>> 1. Is this an error/bug in FreeBSD 7.2? >>> This is known limitation of, I think, GEOM stack. >> No, it is certainly not. What would be the point? >> > > Please re-iterate :) > > When GEOM is signalled about new device, it tries to understand data > structures - MBR, partition table, etc. The key is 'when signalled'. So this > is not limitation of GEOM per se, just missing signalling of new device/data > media arrival. Ah yes, if the reader always signals the device present but doesn't signal media insertion, it would lead to the described problem. I agree there isn't a good solution apart from polling.
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