# e2fsck -f -y /dev/dm-0
e2fsck 1.41.14 (22-Dec-2010)
_Fedora-16-x86_6: recovering journal
Clearing orphaned inode 162164 (uid=0, gid=0, mode=0100644, size=10898776)
Clearing orphaned inode 17442 (uid=0, gid=0, mode=0100755, size=27520)
Clearing orphaned inode 156288 (uid=0, gid=0, mode=0100755, size=291672)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
_Fedora-16-x86_6: ***** FILE SYSTEM WAS MODIFIED *****
_Fedora-16-x86_6: 96688/262144 files (0.3% non-contiguous), 672875/1048576 blocks
# e2fsck -p /dev/dm-0
_Fedora-16-x86_6: clean, 96688/262144 files, 672875/1048576 blocks
# dmsetup status
item: 0 8388608 snapshot 202424/204800 800
Subsequent mounting (read-only for safety) succeeded in showing the
I agree with Douglas that there is a significant class of non-technical
Live USB users who would benefit from a fail safe mechanism for their
content based in overlays of a read-only origin.
For example, students and teachers using the Sugar on a Stick Spin,
have been frustrated when their portfolio of work has been 'lost'
after a couple of months of classwork.
We are working to provide better file system support, viz.,
and any Device-mapper support would be much appreciated!