> a strace on the mount command shows that the syscall mount is executed w/o
> mount("/dev/sda5", "/mnt/", "ext2", 0xc0ed0000, 0) = 0
> As far as i know it should return EBUSY on a fs that is already mounted.
No, it shouldn't. HOWEVER, trees should be in sync (actually, there's
only one tree and only one superblock).
> Second mystery:
> the mounted /dev/hda3 contains the same data as /dev/sda5 and changes to one
> of them affect both partitions.
Please, post your /proc/mounts. Results of ls -l /dev/hda3 /dev/sda5
would also be very interesting.
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