EXTATTRCTL(8) 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_EX- TATTR 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 over- write 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 at- tributes rather than relying on sparse files to conserve space. This has the advantage of guaranteeing that space will be available 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 initialized attribute file attrfile. Available namespaces are "user" and "sys- tem". 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(4), 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 exten- sions requiring additional labels to be associated with each file or direc- tory. AUTHORS Robert N M Watson FreeBSD 15.1 March 30, 2000 EXTATTRCTL(8)
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