Date: Mon, 16 Feb 2009 17:37:22 -0800 From: Marcel Moolenaar <xcllnt@mac.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: usb@freebsd.org Subject: Re: USB2+umass: root mount fails Message-ID: <6E9B5FF6-685B-427C-87A7-C95850DA5B6F@mac.com> In-Reply-To: <20090216.173544.1555327603.imp@bsdimp.com> References: <ACB7DFF1-6C8E-4936-9BD9-BB2FD375F3BB@mac.com> <20090216.161346.1176917525.imp@bsdimp.com> <741FAA3B-B91A-4A23-B47F-21141A8D0B5D@mac.com> <20090216.173544.1555327603.imp@bsdimp.com>
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On Feb 16, 2009, at 4:35 PM, M. Warner Losh wrote: > In message: <741FAA3B-B91A-4A23-B47F-21141A8D0B5D@mac.com> > Marcel Moolenaar <xcllnt@mac.com> writes: > : > : On Feb 16, 2009, at 3:13 PM, M. Warner Losh wrote: > : > : > In message: <ACB7DFF1-6C8E-4936-9BD9-BB2FD375F3BB@mac.com> > : > Marcel Moolenaar <xcllnt@mac.com> writes: > : > : Before I dig into the code, what's the current status of > : > : root mounts on USB mass storage devices? > : > > : > First, there's a kludge-o-round that is similar to your "sleep 10" > : > that you've added. It loops waiting for more devices to show up > if > : > the desired root file system hasn't appeared yet. > : > > : > There's no way for hot-plug busses to tell the kernel "I've > tried my > : > best to enumerate everything on my bus, and I'm done" > : > : Of course there is. Any and all USB hubs have a certain > : number of ports. You can trivially iterate over all of > : them and declare completion when you've tried them all. > > The hot-plug busses know. The mountroot code doesn't have a way to > wait for the hot-plug busses. Huh? root_mount_hold() and root_mount_rel() are specifically designed to inform the mountroot code that it needs to wait (or that it should go ahead and mount root). -- Marcel Moolenaar xcllnt@mac.com
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