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
OpenBSD 2.3 and then in
NetBSD
3.1. Support for searching in files was added in
NetBSD 4.0.
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.