Date: Sat, 15 Oct 2016 18:16:21 -0500 From: Brandon J. Wandersee <brandon.wandersee@gmail.com> To: "Jason C. Wells" <jasoncwells@fastmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Filesystem Label Ambiguity Message-ID: <86pon1dwze.fsf@WorkBox.Home> In-Reply-To: <c183f0a0-4459-228a-edb8-bcd8d393ca20@fastmail.com> References: <c183f0a0-4459-228a-edb8-bcd8d393ca20@fastmail.com>
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Jason C. Wells writes: > Let's say I have three disks and each of them has a partition labelled > "volume3" i.e. /dev/ufs/volume3. > > How can I determine which of those is currently mounted? > > How does the system determine which of those to mount at boot time? Short answer: Don't do this. Long answer: The only thing I can think of is to check /dev/diskid/*. The one filesystem that *does not* have a node /dev/diskid/* will be the one that's mounted. Of course you'd then have to figure out what the ID number of each disk/partition is, which is exactly what unique partition/filesystem labels were invented to avoid. If this more than hypothetical, and you have filesystems that already have labels, they can be changed by running `tunefs -L <label>` on the unmounted partition. As for your second question, I'm pretty sure the one that will be mounted if you run mount(8) or put an entry in /etc/fstab will be whichever was first detected on start-up. -- :: Brandon J. Wandersee :: brandon.wandersee@gmail.com :: -------------------------------------------------- :: 'The best design is as little design as possible.' :: --- Dieter Rams ----------------------------------
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