Messages in this thread | | | From | Kay Sievers <> | Date | Thu, 16 Jun 2011 19:20:07 +0200 | Subject | Re: [PATCH 1/3] [RFC] genhd: add a new attribute in device structure |
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On Thu, Jun 16, 2011 at 19:09, Kay Sievers <kay.sievers@vrfy.org> wrote: > On Thu, Jun 16, 2011 at 18:25, James Bottomley > <James.Bottomley@hansenpartnership.com> wrote: >> On Thu, 2011-06-16 at 09:14 -0700, Greg KH wrote: >> > All userspace naming will be taken care of by the usual udev rules, so >>> > for disks, something like /dev/disk/by-preferred/<fred> which would be >>> > the usual symbolic link. >>> >>> No, udev can not create such a link after the preferred name is set, as >>> it has no way of knowing that the name was set. >> >> It can if we trigger a uevent. Note: I'm not advocating this ... I'd be >> equally happy having whatever sets the kernel name create the link (or >> tickle udev to create it). We definitely require device links, though, >> to get this to work.
Guess all that would work now, including mount(8) not canonicalizing. What would happen if we mount: /dev/disk/by-pretty/foo and some tool later thinks the pretty name should better be 'bar', it writes the name to /sys, we get a uevent, the old link disappears, we get a new link, mount has no device node anymore for the mounted device ...
So we basically get a one-shot additional pretty name? Guess, the _single_ name changed anytime later just asks for serious problems. We need to set it very early to be really useful, but how, where is it coming from?
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