Date: Thu, 20 Nov 2008 11:28:25 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-fs@freebsd.org Subject: Re: Unique ID for UFS? Message-ID: <gg3e2g$5ct$1@ger.gmane.org> In-Reply-To: <200811201215.42008.doconnor@gsoft.com.au> References: <200811201215.42008.doconnor@gsoft.com.au>
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[-- Attachment #1 --] Daniel O'Connor wrote: > Hi, > I am wondering if there is a unique ID generated for each UFS already? If not > would it be possible to add one somehow? > > There is glabel, but I think having a UUID embedded in the FS would be very > handy for automation andwould prevent accidents that glabel can cause. > > So, there could be a gfsid module that reads IDs from the FS (NTFS, ext2/3, > UFS) and creates device nodes to allow access. Looking at the output of dumpfs, there is an 64-bit numeric "id" field that changes from file system to file system so this might it: magic 19540119 (UFS2) time Sat Nov 15 04:16:42 2008 superblock location 65536 id [ 46ea67b4 178d71a1 ] (but judging from how the value changes on my file systems it might be related to the timestamp). If this is a usable ID, it should be trivial to make glabel create IDs nodes (i.e. /dev/ufs/46ea67b4178d71a1). [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJJTvJldnAQVacBcgRAvNpAJ0eFZo6kBsVCbpJV7q7PPMfdmXFdQCdH+tb pih+tyrDzy7Lzon82qxvHD4= =UOKJ -----END PGP SIGNATURE-----
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