FFSINFO(8) System Manager's Manual FFSINFO(8) 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 std- out. EXAMPLES ffsinfo -o /var/tmp/ffsinfo -l 1023 /dev/md0 will dump /dev/md0 to /var/tmp/ffsinfo with all available information. SEE ALSO ffs(4), dumpfs(8), fsck(8), gpart(8), growfs(8), newfs(8), tunefs(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. FreeBSD 15.1 January 23, 2025 FFSINFO(8)
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