linux kernel - dm-zero device mount errors -


i trying create dm-zero device , mount it,but getting following errors during mount.i have been stuck here long. appreciated.

error

mount: wrong fs type, bad option, bad superblock on /dev/mapper/zero_1, missing codepage or helper program, or other error in cases useful info found in syslog - try dmesg | tail or so

steps followed are:

  1. dmsetup create zero_1 --table '0 20000 zero'
  2. mkfs -t ext2 /dev/mapper/zero_1
  3. mount -t ext2 /dev/mapper/zero_1 /mnt

dmesg says:

[ 2547.110310] ext2-fs (dm-0): error: can't find ext2 filesystem on dev dm-0.

really? dm-zero creates device returns 0s. never see ext2 filesystem.


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