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EXTATTRCTL(8)		FreeBSD	System Manager's Manual		 EXTATTRCTL(8)

NAME
     extattrctl	-- manage UFS1 extended	attributes

SYNOPSIS
     extattrctl	start path
     extattrctl	stop path
     extattrctl	initattr [-f] [-p path]	attrsize attrfile
     extattrctl	showattr attrfile
     extattrctl	enable path attrnamespace attrname attrfile
     extattrctl	disable	path attrnamespace attrname

DESCRIPTION
     The extattrctl utility is the management utility for extended attributes
     over the UFS1 file	system.	 It allows the starting	and stopping of
     extended attributes on a file system, as well as initialization of
     attribute backing files, and enabling and disabling of specific extended
     attributes	on a file system.

     The first argument	on the command line indicates the operation to be per-
     formed.  Operation	must be	one of the following:

     start path
	     Start extended attribute support on the file system named using
	     path.  The	file system must be an UFS1 file system, and the
	     UFS_EXTATTR kernel	option must have been enabled.

     stop path
	     Stop extended attribute support on	the file system	named using
	     path.  Extended attribute support must previously have been
	     started.

     initattr [-f] [-p path] attrsize attrfile
	     Create and	initialize a file to use as an attribute backing file.
	     You must specify a	maximum	per-inode size for the attribute in
	     bytes in attrsize,	as well	as the file where the attribute	will
	     be	stored,	using attrfile.

	     The -f argument may be used to indicate that it is	alright	to
	     overwrite an existing attribute backing file; otherwise, if the
	     target file exists, an error will be returned.

	     The -p path argument may be used to preallocate space for all
	     attributes	rather than relying on sparse files to conserve	space.
	     This has the advantage of guaranteeing that space will be avail-
	     able for attributes when they are written,	preventing low disk
	     space conditions from denying attribute service.

	     This file should not exist	before running initattr.

     showattr attrfile
	     Show the attribute	header values in the attribute file named by
	     attrfile.

     enable path attrnamespace attrname	attrfile
	     Enable an attribute named attrname	in the namespace attrnamespace
	     on	the file system	identified using path, and backed by initial-
	     ized attribute file attrfile.  Available namespaces are "user"
	     and "system".  The	backing	file must have been initialized	using
	     initattr before its first use.  Attributes	must have been started
	     on	the file system	prior to the enabling of any attributes.

     disable path attrnamespace	attrname
	     Disable the attributed named attrname in namespace	attrnamespace
	     on	the file system	identified by path.  Available namespaces are
	     "user" and	"system".  The file system must	have attributes
	     started on	it, and	the attribute most have	been enabled using
	     enable.

EXAMPLES
	   extattrctl start /

     Start extended attributes on the root file	system.

	   extattrctl initattr 17 /.attribute/system/md5

     Create an attribute backing file in /.attribute/system/md5, and set the
     maximum size of each attribute to 17 bytes, with a	sparse file used for
     storing the attributes.

	   extattrctl enable / system md5 /.attribute/system/md5

     Enable an attribute named md5 on the root file system, backed from	the
     file /.attribute/system/md5.

	   extattrctl disable /	md5

     Disable the attribute named md5 on	the root file system.

	   extattrctl stop /

     Stop extended attributes on the root file system.

SEE ALSO
     ffs(7), getextattr(8), setextattr(8), extattr(9)

HISTORY
     Extended attribute	support	was developed as part of the TrustedBSD
     Project, and introduced in	FreeBSD	5.0.  It was developed to support
     security extensions requiring additional labels to	be associated with
     each file or directory.

AUTHORS
     Robert N M	Watson

FreeBSD	9.2			March 30, 2000			   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | HISTORY | AUTHORS

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