On Mon, Feb 27, 2012 at 10:15:00PM +0100, Helmut Hullen wrote:

Du meintest am 27.02.12:

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   I've said this several times: Your expectations are wrong. You
don't label partitions.

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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").

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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.

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From the manpages:

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mkfs.btrfs (aka mkbtrfs):

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       -L, --label name
              Specify a label for the filesystem.

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mkfs.ext2/3/4 (aka mke2fs):

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       -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.

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