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ffs (7)
  • ffs (3) ( Solaris man: Библиотечные вызовы )
  • ffs (3) ( FreeBSD man: Библиотечные вызовы )
  • ffs (3) ( Русские man: Библиотечные вызовы )
  • ffs (3) ( Linux man: Библиотечные вызовы )
  • ffs (3) ( POSIX man: Библиотечные вызовы )
  • >> ffs (7) ( FreeBSD man: Макропакеты и соглашения )

  • BSD mandoc
     

    NAME

    
    
    ffs
    
     - Berkeley fast file system
    
     
    

    SYNOPSIS

    In the kernel configuration file: options FFS options QUOTA options SOFTUPDATES options SUIDDIR options UFS_ACL options UFS_DIRHASH options UFS_EXTATTR 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. has been optimized over the years for speed and reliability and is the default Fx file system.  

    Quotas

    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

    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

    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

    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 Sx 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

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

     

    Extended Attributes

    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).
    options UFS_EXTATTR_AUTOSTART
    If this option is defined, 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 :

    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)
    M. McKusick W. Joy S. Leffler R. Fabry August 1984 "A Fast File System for UNIX" "ACM Transactions on Computer Systems" 2 3 181-197
    M. McKusick June 2000 "Soft Updates: A Technique for Eliminating Most Synchronous Writes in the Fast Filesystem" "Proceedings of the Freenix Track at the 1999 Usenix Annual Technical Conference" 71-84


     

    Index

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


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