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-.\" Copyright (c) 2001 Networks Associates Technologies, Inc.
-.\" All rights reserved.
-.\" 
-.\" This software was developed for the FreeBSD Project by Chris
-.\" Costello at Safeport Network Services and NAI Labs, the Security
-.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
-.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
-.\" research program.
-.\" 
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. The name of the author may not be used to endorse or promote
-.\"    products derived from this software without specific prior written
-.\"    permission.
-.\" 
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\" 
-.\" $FreeBSD$
-.Dd December 26, 2001
-.Dt UFS 7
-.Sh NAME
-.Nm ufs
-.Nd UNIX file system
-.Sh SYNOPSIS
-.Cd options ENABLE_VFS_IOOPT
-.Cd options FFS
-.Cd options QUOTA
-.Cd options SUIDDIR
-.Cd options UFS_ACL
-.Cd options UFS_DIRHASH
-.Cd options UFS_EXTATTR
-.Cd options UFS_EXTATTR_AUTOSTART
-.Sh DESCRIPTION
-The UFS file system,
-based on the Berkeley fast file system
-(see
-.Xr ffs 7 ) ,
-is the default file system in the
-.Fx
-operating system.
-UFS is an advanced file system
-capable of managing large and numerous files,
-and providing support for features which
-provide added reliability as well as added features,
-such as Soft Updates, and Extended Attributes, respectively.
-The following is a more complete list of the
-optional features offered by UFS,
-and how to enable and use them.
-.Ss VFS I/O optimization
-.Bl -tag -width 2n
-.It Cd options ENABLE_VFS_IOOPT
-This option enables the IO optimization through the VM system,
-using VM operations instead of copying operations when possible.
-This option adds a sysctl MIB,
-.Em vfs.ioopt .
-The following are values and effects for
-.Em vfs.ioopt :
-.Pp
-.Bl -tag -width "Value" -offset indent -compact
-.It Em Value
-.Em Effect
-.It Li 0
-No optimization
-.It Li 1
-VM operations if a request fits
-.It Li 2
-Aggresive optimization (VM used as much as possible)
-.El
-.El
-.Ss Quotas
-.Bl -tag -width 2n
-.It 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
-.Sq quota
-option;
-see
-.Xr quota 1
-and
-.Xr edquota 8 .
-.El
-.Ss File Ownership Inheritance
-.Bl -tag -width 2n
-.It 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
-.Sq suiddir
-option
-to inherit the ownership of its directory,
-i.e.
-.Dq "If it's my directory, it must be my file."
-.El
-.Ss Access Control Lists
-.Bl -tag -width 2n
-.It Cd options UFS_ACL
-Access control lists allow the association of
-fine-grained descretionary access control information
-with files and directories.
-This option requires the presence of the
-.Dv UFS_EXTATTR
-option, and it is recommended that
-.Dv UFS_EXTATTR_AUTOSTART
-is included as well,
-so that ACLs are enabled atomically upon mounting the file system.
-.El
-.Pp
-In order to enable support for ACLs,
-two extended attributes must be available in the
-.Dv EXTATTR_NAMESPACE_SYSTEM
-namespace:
-.Dq Li posix1e.acl_access ,
-which holds the access ACL,
-and
-.Dq Li posix1e.acl_default ,
-which holds the default ACL for directories.
-If you are using UFS 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
-.Sx "Extended Attributes"
-for more details.
-.Pp
-.Bd -literal -offset indent
-mkdir -p /.attribute/system
-cd /.attribute/system
-extattrctl initattr -p / 388 posix1e.acl_access
-extattrctl initattr -p / 388 posix1e.acl_default
-.Ed
-.Pp
-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.
-.Ss Directory Hashing
-.Bl -tag -width 2n
-.It Cd options UFS_DIRHASH
-Implements a hash-based lookup scheme for UFS directories
-in order to speed up accesses to very large directories.
-.El
-.Ss Extended Attributes
-.Bl -tag -width 2n
-.It 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
-.Xr extattrctl 8 .
-.It Cd options UFS_EXTATTR_AUTOSTART
-If this option is defined,
-.Nm UFS
-will search for a
-.Dq Pa .attribute
-subdirectory of the file system root during the mount operation.
-If found, extended attribute support will be
-automatically started for that file system.
-.El
-.Sh SEE ALSO
-.Xr quota 1 ,
-.Xr acl 3 ,
-.Xr extattr 3 ,
-.Xr ffs 7 ,
-.Xr edquota 8 ,
-.Xr extattrctl 8 ,
-.Xr sysctl 8