GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  FFS (7)

NAME

ffs - Berkeley fast file system

CONTENTS

Synopsis
Description
     Quotas
     Soft Updates
     File Ownership Inheritance
     Access Control Lists
     Directory Hashing
     Extended Attributes
See Also

SYNOPSIS

In the kernel configuration file:
.Cd options FFS
.Cd options QUOTA
.Cd options SOFTUPDATES
.Cd options SUIDDIR
.Cd options UFS_ACL
.Cd options UFS_DIRHASH
.Cd options UFS_EXTATTR
.Cd 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
.Fx file system.

    Quotas

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).

    Soft Updates

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).

    File Ownership Inheritance

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."

    Access Control Lists

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.

    Directory Hashing

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

    Extended Attributes

Cd options UFS_EXTATTR
  Extended attributes allow the association of additional arbitrary metadata with files and directories, which can be assigned and retrieved from userland as well as from within the kernel; see extattrctl(8).
Cd 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. (Default: 1.)
vfs.ffs.doreallocblks
  Enable support for the rearrangement of blocks to be contiguous. (Default: 1.)

SEE ALSO

quota(1), acl(3), extattr(3), edquota(8), extattrctl(8), sysctl(8)
.Rs A Fast File System for UNIX
.Re
.Rs Soft Updates: A Technique for Eliminating Most Synchronous Writes in the Fast Filesystem
.Re
Search for    or go to Top of page |  Section 7 |  Main Index


Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.