NAME¶
ffsinfo —
dump all meta information of
an existing ufs file system
SYNOPSIS¶
ffsinfo |
[-g
cylinder_group]
[-i inode]
[-l level]
[-o
outfile] special |
file |
DESCRIPTION¶
The
ffsinfo utility extends the
dumpfs(8)
utility.
The output is appended to the file
outfile. Also expect the
output file to be rather large. Up to 2 percent of the size of the specified
file system is not uncommon.
The following options are available:
- -g
cylinder_group
- This restricts the dump to information about this cylinder
group only. Here 0 means the first cylinder group
and -1 the last one.
- -i
inode
- This restricts the dump to information about this
particular inode only. Here the minimum acceptable inode is
2. If this option is omitted but a cylinder group is
defined then only inodes within that cylinder group are dumped.
- -l
level
- The level of detail which will be dumped. This value
defaults to 255 and is the “bitwise or”
of the following table:
- 0x001
- initial superblock
- 0x002
- superblock copies in each
cylinder group
- 0x004
- cylinder group summary in
initial cylinder group
- 0x008
- cylinder group
information
- 0x010
- inode allocation
bitmap
- 0x020
- fragment allocation
bitmap
- 0x040
- cluster maps and
summary
- 0x100
- inode information
- 0x200
- indirect block dump
- -o
outfile
- This sets the output filename where the dump is written to,
and must be specified. If - is provided, output will be
sent to stdout.
EXAMPLES¶
ffsinfo -o /var/tmp/ffsinfo -l 1023
/dev/vinum/testvol
will dump
/dev/vinum/testvol to
/var/tmp/ffsinfo with all available information.
SEE ALSO¶
disklabel(8),
dumpfs(8),
fsck(8),
growfs(8),
newfs(8),
tunefs(8),
vinum(8)
HISTORY¶
The
ffsinfo utility first appeared in
FreeBSD
4.4.
AUTHORS¶
Christoph Herrmann ⟨chm@FreeBSD.org⟩
Thomas-Henning von Kamptz
⟨tomsoft@FreeBSD.org⟩
The GROWFS team ⟨growfs@Tomsoft.COM⟩
BUGS¶
Snapshots are handled like plain files. They should get their own level to
provide for independent control of the amount of what gets dumped. It probably
also makes sense to some extend to dump the snapshot as a file system.