ffs(7)

NAME

ffs - Berkeley fast file system

SYNOPSIS

In the kernel configuration file:
options FFS
options QUOTA
options SOFTUPDATES
options SUIDDIR
options UFS_ACL
options UFS_DIRHASH
options UFS_EXTATTR
options UFS_EXTATTR_AUTOSTART
In fstab(5):
/dev/disk0a     /mnt ufs rw 1 1

DESCRIPTION

The Berkeley fast file system provides facilities to store
file system
data onto a disk device. ffs has been optimized over the
years for speed and reliability and is the default FreeBSD file system.
Quotas: options QUOTA
This option allows system administrators to set limits

on disk usage
on a per-user basis. Quotas can be used only on file

systems mounted
with the quota option; see quota(1) and edquota(8).
Soft Updates: options SOFTUPDATES
The soft updates feature tracks writes to the disk and

enforces metadata update dependencies (e.g., updating free block

maps) to ensure
that the file system remains consistent.

To enable soft updates on an unmounted file system, use

the following
command:

tunefs -n enable fs

fs can be either a mount point listed in fstab(5) (e.g.,

/usr), or a
disk device (e.g., /dev/da0a).
File Ownership Inheritance: options SUIDDIR
For use in file sharing environments on networks includ

ing Microsoft
Windows and Apple Macintosh computers, this option al

lows files on
file systems mounted with the suiddir option to inherit

the ownership
of its directory, i.e., ``if it's my directory, it must

be my file.''
Access Control Lists: options UFS_ACL
Access control lists allow the association of fine

grained discretionary access control information with files and direc

tories. This
option requires the presence of the UFS_EXTATTR option,

and it is
recommended that UFS_EXTATTR_AUTOSTART is included as

well, so that
ACLs are enabled atomically upon mounting the file sys

tem.; In order to enable support for ACLs, two extended attributes; must be
available in the EXTATTR_NAMESPACE_SYSTEM namespace:; posix1e.acl_access,
which holds the access ACL, and posix1e.acl_default, which; holds the
default ACL for directories. If you are using file system; extended
attributes, the following commands may be used to allocate; space for and
create the necessary EA backing files for ACLs in the root; of each file
system. In these examples, the root file system is used;; see Extended
Attributes for more details.

mkdir -p /.attribute/system
cd /.attribute/system
extattrctl initattr -p / 388 posix1e.acl_access
extattrctl initattr -p / 388 posix1e.acl_default; On the next mount of the root file system, the attributes; will be automatically started (if UFS_EXTATTR_AUTOSTART is included in; the kernel
configuration), and ACLs will be enabled.
Directory Hashing: options UFS_DIRHASH
Implements a hash-based lookup scheme for directories in

order to
speed up accesses to very large directories.
Extended Attributes: options UFS_EXTATTR
Extended attributes allow the association of additional

arbitrary
metadata with files and directories, which can be as

signed and
retrieved from userland as well as from within the ker

nel; see
extattrctl(8).; options UFS_EXTATTR_AUTOSTART
If this option is defined, ffs will search for a

.attribute subdirectory of the file system root during the mount operation.

If found,
extended attribute support will be automatically started

for that
file system.; The following sysctl(8) MIBs are defined for use with ffs:; vfs.ffs.doasyncfree Asynchronously write out modified; i-node and
indirect blocks upon reallocating

file system
blocks to be contiguous. (De

fault: 1.)
vfs.ffs.doreallocblks Enable support for the rearrange
ment of blocks: to be contiguous. (Default: 1.)

docs.sk

comprehensive documentation repository

In section

See also

ffs(7)

NAME

SYNOPSIS

DESCRIPTION

SEE ALSO