Newbie question about xfs_db with the response message "unexpected XFS SB magic number 0x2e524d46"

[Hxsrmeng <hxsrmeng@gmail.com>]

OpenSUSE10.2. and 2.6.22-rc7-default XFS
1)
I'd like to run "xfs_db -f -c "sb 0" -c "p" ./myfile | egrep
'agcount|inopblog|agblklog'" to see the three values.
I mounted my xfs_disk.
Then I run : 
               xfs_db -f -c "sb 0" -c "p" ./loop | egrep
'agcount|inopblog|agblklog'
It said:
               xfs_db: unexpected XFS SB magic number 0x2e524d46
               Floating point exception
I don't know what the problem is.
But if I umount my xfs_disk, 
Then I run 
              xfs_db {my_xfs_device}
              xfs_db>sb
              xfs_db>p
It's OK.But I can not see things about ./myfile now, since my xfs_disk is
umounted.
2)
I have to umount my xfs_disk before I use xfs_db, correct?
3)
If I want to read the inode content of a file, say, myfile, I should 
"ls -li myfile" to get the inode number of myfile
Then 
"xfs_db> inode <inode number>" to read the content of inode
Is what I said correct?
Thanks in advance.



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