NAME
scan_ffs,
scan_lfs
- find FFSv1/FFSv2/LFS partitions on a disk or file
SYNOPSIS
scan_ffs
[-blv]
[-e end]
[-F file]
[-s start]
device
DESCRIPTION
scan_ffs
will take a raw disk device that covers the whole disk or a file
and will find all possible FFSv[12]/LFS partitions, independent
of block sizes on it.
It will show the file system type (FFSv1, FFSv2, or LFS), size, and
offset.
Also it has an option to show the values with a disklabel-alike
output.
The options are as follows:
- -b
-
Report every superblock found with its sector address, rather than trying
to report the partition boundaries.
This option can be useful to find the other superblocks in a partition if
the first superblock has become corrupted.
It is most useful if
device
refers to the raw device for the partition, rather than the entire disk.
- -e end
-
Where to stop searching for file systems.
The
end
argument specifies the last sector that will be searched.
Default is the last sector of
device.
- -F file
-
Path to a file containing possible partitions inside of it.
- -l
-
Print out a string looking much like the input to disklabel.
With a little massaging, this output can usually be used by
disklabel(8).
- -s start
-
Where to start searching for file systems.
This makes it easier to skip swap
partitions or other large non-UFS/FFS partitions.
The
start
argument specifies the first sector that will be searched.
Default is the first sector of
device.
- -v
-
Be verbose about what
scan_ffs
is doing, and what has been found.
The
device
argument specifies which device
scan_ffs
should scan for file systems.
scan_lfs
is just another name for the same program, both behave in exactly
the same way.
SEE ALSO
disklabel(8)
HISTORY
The
scan_ffs
program first appeared in
OpenBSD2.3
and then in
NetBSD3.1.
Support for searching in files was added in
NetBSD4.0.
AUTHORS
scan_ffs
was written for
OpenBSD
by
Niklas Hallqvist
and
Tobias Weingartner.
It was ported to
NetBSD
by
Juan Romero Pardines,
who added support for LFS/FFSv2,
partitions with fragsize/blocksize greater than
2048/16384 for FFSv1, searching on files, etc.
BUGS
Currently
scan_ffs
won't find partitions with fragsize/blocksize greater than
8192/65536.