Manual Pages  — FFS

ffs – Berkeley fast file system

SYNOPSIS DESCRIPTION Quotas Soft Updates File Ownership Inheritance Access Control Lists Directory Hashing Extended Attributes SEE ALSO

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.

Cd 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).

Cd 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: fs can be either a mount point listed in fstab(5) (e.g., /usr), or a disk device (e.g., /dev/da0a).

Cd options SUIDDIR
	For use in file sharing environments on networks including Microsoft Windows and Apple Macintosh computers, this option allows 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."

Cd options UFS_ACL
	Access control lists allow the association of fine-grained discretionary access control information with files and directories. 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 system.

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.

Cd options UFS_DIRHASH
	Implements a hash-based lookup scheme for directories in order to speed up accesses to very large directories.