On Mon, Feb 27, 2012 at 10:15:00PM +0100, Helmut Hullen wrote: > Du meintest am 27.02.12: > > >>> I've said this several times: Your expectations are wrong. You > >>> don't label partitions. > > >> Yes - now I know. > >> But I'm afraid other people also expect wrong - when I use > >> mkfs.ext[234] then this option works (in another way than with > >> "mkfs.btrfs"). > > > AFAIK, it works in the same way... that is, it labels the, in that > > case, ext2/3/4 filesystem, in this case (mkfs.btrfs), btrfs > > filesystem. > > > From the manpages: > > > mkfs.btrfs (aka mkbtrfs): > > > -L, --label name > > Specify a label for the filesystem. > > > mkfs.ext2/3/4 (aka mke2fs): > > > -L new-volume-label > > Set the volume label for the filesystem to > > new-volume-label. The maximum length of the > > volume label is 16 bytes. > > But there's a small difference: > > mke2fs -L MyLabel /dev/sdn4 > > only sets/changes the label (ok - it tests the type of the partition and > refuses labeling if the type doesn't fit).
OK, I have just tried this out. It does set the filesystem label. It also wipes the filesystem, as I expected it to. You clearly aren't doing this on existing filesystems with data in them. hrm@ruth:~ $ sudo mke2fs /dev/loop0 mke2fs 1.42 (29-Nov-2011) Filesystem label= OS type: Linux Block size=1024 (log=0) Fragment size=1024 (log=0) Stride=0 blocks, Stripe width=0 blocks 25688 inodes, 102400 blocks 5120 blocks (5.00%) reserved for the super user First data block=1 Maximum filesystem blocks=67371008 13 block groups 8192 blocks per group, 8192 fragments per group 1976 inodes per group Superblock backups stored on blocks: 8193, 24577, 40961, 57345, 73729 Allocating group tables: done Writing inode tables: done Writing superblocks and filesystem accounting information: done hrm@ruth:~ $ sudo mount /dev/loop0 /mnt hrm@ruth:~ $ sudo dd if=/dev/urandom of=/mnt/foo bs=1M count=5 5+0 records in 5+0 records out 5242880 bytes (5.2 MB) copied, 1.74158 s, 3.0 MB/s hrm@ruth:~ $ ls /mnt foo lost+found hrm@ruth:~ $ sudo umount /mnt hrm@ruth:~ $ sudo mke2fs -L newlabel /dev/loop0 mke2fs 1.42 (29-Nov-2011) Filesystem label=newlabel OS type: Linux Block size=1024 (log=0) Fragment size=1024 (log=0) Stride=0 blocks, Stripe width=0 blocks 25688 inodes, 102400 blocks 5120 blocks (5.00%) reserved for the super user First data block=1 Maximum filesystem blocks=67371008 13 block groups 8192 blocks per group, 8192 fragments per group 1976 inodes per group Superblock backups stored on blocks: 8193, 24577, 40961, 57345, 73729 Allocating group tables: done Writing inode tables: done Writing superblocks and filesystem accounting information: done hrm@ruth:~ $ sudo mount /dev/loop0 /mnt hrm@ruth:~ $ ls /mnt lost+found hrm@ruth:~ $ Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Great oxymorons of the world, no. 6: Mature Student ---
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