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How to configure the Linux kernel/fs

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Howto configure the Linux kernel / fs


File system configuration

File systemsEdit

EXT2Edit

  • Option: EXT2_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Second extended fs support
      Ext2 is a standard Linux file system for hard disks.
      To compile this file system support as a module, choose M here: the module will be called ext2. Be aware however that the file system of your root partition (the one containing the directory /) cannot be compiled as a module, and so this could be dangerous.
      If unsure, say Y.


  • Option: EXT2_FS_XATTR
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Ext2 extended attributes
    • depends on EXT2_FS
      Extended attributes are name:value pairs associated with inodes by the kernel or by users (see the attr(5) manual page, or visit <http://acl.bestbits.at/> for details).
      If unsure, say N.


  • Option: EXT2_FS_POSIX_ACL
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Ext2 POSIX Access Control Lists
    • depends on EXT2_FS_XATTR
    • select FS_POSIX_ACL
      Posix Access Control Lists (ACLs) support permissions for users and groups beyond the owner/group/world scheme.
      To learn more about Access Control Lists, visit the Posix ACLs for Linux website <http://acl.bestbits.at/>.
      If you don't know what Access Control Lists are, say N


  • Option: EXT2_FS_SECURITY
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Ext2 Security Labels
    • depends on EXT2_FS_XATTR
      Security labels support alternative access control models implemented by security modules like SELinux. This option enables an extended attribute handler for file security labels in the ext2 filesystem.
      If you are not using a security module that requires using extended attributes for file security labels, say N.


  • Option: EXT2_FS_XIP
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Ext2 execute in place support
    • depends on EXT2_FS
      Execute in place can be used on memory-backed block devices. If you enable this option, you can select to mount block devices which are capable of this feature without using the page cache.
      If you do not use a block device that is capable of using this, or if unsure, say N.


  • Option: FS_XIP
    • Kernel Versions: 2.6.15.6 ...
execute in place
    • (on/off)
    • depends on EXT2_FS_XIP
    • default y


EXT3Edit

  • Option: EXT3_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Ext3 journalling file system support
      This is the journaling version of the Second extended file system (often called ext3), the de facto standard Linux file system (method to organize files on a storage device) for hard disks.
      The journaling code included in this driver means you do not have to run e2fsck (file system checker) on your file systems after a crash. The journal keeps track of any changes that were being made at the time the system crashed, and can ensure that your file system is consistent without the need for a lengthy check.
      Other than adding the journal to the file system, the on-disk format of ext3 is identical to ext2. It is possible to freely switch between using the ext3 driver and the ext2 driver, as long as the file system has been cleanly unmounted, or e2fsck is run on the file system.
      To add a journal on an existing ext2 file system or change the behavior of ext3 file systems, you can use the tune2fs utility ("man tune2fs"). To modify attributes of files and directories on ext3 file systems, use chattr ("man chattr"). You need to be using e2fsprogs version 1.20 or later in order to create ext3 journals (available at <http://sourceforge.net/projects/e2fsprogs/>).
      To compile this file system support as a module, choose M here: the module will be called ext3. Be aware however that the file system of your root partition (the one containing the directory /) cannot be compiled as a module, and so this may be dangerous.


  • Option: EXT3_FS_XATTR
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Ext3 extended attributes
    • depends on EXT3_FS
    • default y
      Extended attributes are name:value pairs associated with inodes by the kernel or by users (see the attr(5) manual page, or visit <http://acl.bestbits.at/> for details).
      If unsure, say N.
      You need this for POSIX ACL support on ext3.


  • Option: EXT3_FS_POSIX_ACL
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Ext3 POSIX Access Control Lists
    • depends on EXT3_FS_XATTR
    • select FS_POSIX_ACL
      Posix Access Control Lists (ACLs) support permissions for users and groups beyond the owner/group/world scheme.
      To learn more about Access Control Lists, visit the Posix ACLs for Linux website <http://acl.bestbits.at/>.
      If you don't know what Access Control Lists are, say N


  • Option: EXT3_FS_SECURITY
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Ext3 Security Labels
    • depends on EXT3_FS_XATTR
      Security labels support alternative access control models implemented by security modules like SELinux. This option enables an extended attribute handler for file security labels in the ext3 filesystem.
      If you are not using a security module that requires using extended attributes for file security labels, say N.


  • Option: JBD
    • Kernel Versions: 2.6.15.6 ...
CONFIG_JBD could be its own option (even modular), but until there are
other users than ext3, we will simply make it be the same as CONFIG_EXT3_FS
dep_tristate ' Journal Block Device support (JBD for ext3)' CONFIG_JBD $CONFIG_EXT3_FS
    • (on/off/module)
    • default EXT3_FS
      This is a generic journaling layer for block devices. It is currently used by the ext3 file system, but it could also be used to add journal support to other file systems or block devices such as RAID or LVM.
      If you are using the ext3 file system, you need to say Y here. If you are not using ext3 then you will probably want to say N.
      To compile this device as a module, choose M here: the module will be called jbd. If you are compiling ext3 into the kernel, you cannot compile this code as a module.


  • Option: JBD_DEBUG
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JBD (ext3) debugging support
    • depends on JBD
      If you are using the ext3 journaled file system (or potentially any other file system/device using JBD), this option allows you to enable debugging output while the system is running, in order to help track down any problems you are having. By default the debugging output will be turned off.
      If you select Y here, then you will be able to turn on debugging with "echo N > /proc/sys/fs/jbd-debug", where N is a number between 1 and 5, the higher the number, the more debugging output is generated. To turn debugging off again, do echo 0 > /proc/sys/fs/jbd-debug.


  • Option: FS_MBCACHE
    • Kernel Versions: 2.6.15.6 ...
Meta block cache for Extended Attributes (ext2/ext3)
    • (on/off/module)
    • depends on EXT2_FS_XATTR || EXT3_FS_XATTR
    • default y if EXT2_FS=y || EXT3_FS=y
    • default m if EXT2_FS=m || EXT3_FS=m


ReiserFSEdit

  • Option: REISERFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Reiserfs support
      Stores not just filenames but the files themselves in a balanced tree. Uses journaling.
      Balanced trees are more efficient than traditional file system architectural foundations.
      In general, ReiserFS is as fast as ext2, but is very efficient with large directories and small files. Additional patches are needed for NFS and quotas, please see <http://www.namesys.com/> for links.
      It is more easily extended to have features currently found in database and keyword search systems than block allocation based file systems are. The next version will be so extended, and will support plugins consistent with our motto ``It takes more than a license to make source code open.
      Read <http://www.namesys.com/> to learn more about reiserfs.
      Sponsored by Threshold Networks, Emusic.com, and Bigstorage.com.
      If you like it, you can pay us to add new features to it that you need, buy a support contract, or pay us to port it to another OS.


  • Option: REISERFS_CHECK
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Enable reiserfs debug mode
    • depends on REISERFS_FS
      If you set this to Y, then ReiserFS will perform every check it can possibly imagine of its internal consistency throughout its operation. It will also go substantially slower. More than once we have forgotten that this was on, and then gone despondent over the latest benchmarks.:-) Use of this option allows our team to go all out in checking for consistency when debugging without fear of its effect on end users. If you are on the verge of sending in a bug report, say Y and you might get a useful error message. Almost everyone should say N.


  • Option: REISERFS_PROC_INFO
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Stats in /proc/fs/reiserfs
    • depends on REISERFS_FS
      Create under /proc/fs/reiserfs a hierarchy of files, displaying various ReiserFS statistics and internal data at the expense of making your kernel or module slightly larger (+8 KB). This also increases the amount of kernel memory required for each mount. Almost everyone but ReiserFS developers and people fine-tuning reiserfs or tracing problems should say N.


  • Option: REISERFS_FS_XATTR
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) ReiserFS extended attributes
    • depends on REISERFS_FS
      Extended attributes are name:value pairs associated with inodes by the kernel or by users (see the attr(5) manual page, or visit <http://acl.bestbits.at/> for details).
      If unsure, say N.


  • Option: REISERFS_FS_POSIX_ACL
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) ReiserFS POSIX Access Control Lists
    • depends on REISERFS_FS_XATTR
    • select FS_POSIX_ACL
      Posix Access Control Lists (ACLs) support permissions for users and groups beyond the owner/group/world scheme.
      To learn more about Access Control Lists, visit the Posix ACLs for Linux website <http://acl.bestbits.at/>.
      If you don't know what Access Control Lists are, say N


  • Option: REISERFS_FS_SECURITY
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) ReiserFS Security Labels
    • depends on REISERFS_FS_XATTR
      Security labels support alternative access control models implemented by security modules like SELinux. This option enables an extended attribute handler for file security labels in the ReiserFS filesystem.
      If you are not using a security module that requires using extended attributes for file security labels, say N.

JFSEdit

  • Option: JFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) JFS filesystem support
    • select NLS
      This is a port of IBM's Journaled Filesystem . More information is available in the file <file:Documentation/filesystems/jfs.txt>.
      If you do not intend to use the JFS filesystem, say N.


  • Option: JFS_POSIX_ACL
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFS POSIX Access Control Lists
    • depends on JFS_FS
    • select FS_POSIX_ACL
      Posix Access Control Lists (ACLs) support permissions for users and groups beyond the owner/group/world scheme.
      To learn more about Access Control Lists, visit the Posix ACLs for Linux website <http://acl.bestbits.at/>.
      If you don't know what Access Control Lists are, say N


  • Option: JFS_SECURITY
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFS Security Labels
    • depends on JFS_FS
      Security labels support alternative access control models implemented by security modules like SELinux. This option enables an extended attribute handler for file security labels in the jfs filesystem.
      If you are not using a security module that requires using extended attributes for file security labels, say N.


  • Option: JFS_DEBUG
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFS debugging
    • depends on JFS_FS
      If you are experiencing any problems with the JFS filesystem, say Y here. This will result in additional debugging messages to be written to the system log. Under normal circumstances, this results in very little overhead.


  • Option: JFS_STATISTICS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFS statistics
    • depends on JFS_FS
      Enabling this option will cause statistics from the JFS file system to be made available to the user in the /proc/fs/jfs/ directory.


  • Option: FS_POSIX_ACL
    • Kernel Versions: 2.6.15.6 ...
Posix ACL utility routines (for now, only ext2/ext3/jfs/reiserfs)
NOTE: you can implement Posix ACLs without these helpers (XFS does).
Never use this symbol for ifdefs.
    • (on/off)
    • default n


XFSEdit


MINIXEdit

  • Option: MINIX_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Minix fs support
      Minix is a simple operating system used in many classes about OS's. The minix file system (method to organize files on a hard disk partition or a floppy disk) was the original file system for Linux, but has been superseded by the second extended file system ext2fs. You don't want to use the minix file system on your hard disk because of certain built-in restrictions, but it is sometimes found on older Linux floppy disks. This option will enlarge your kernel by about 28 KB. If unsure, say N.
      To compile this file system support as a module, choose M here: the module will be called minix. Note that the file system of your root partition (the one containing the directory /) cannot be compiled as a module.


ROMFSEdit

  • Option: ROMFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) ROM file system support
      This is a very small read-only file system mainly intended for initial ram disks of installation disks, but it could be used for other read-only media as well. Read <file:Documentation/filesystems/romfs.txt> for details.
      To compile this file system support as a module, choose M here: the module will be called romfs. Note that the file system of your root partition (the one containing the directory /) cannot be a module.
      If you don't know whether you need it, then you don't need it: answer N.


Partition OptionsEdit

  • Option: INOTIFY
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Inotify file change notification support
    • default y
      Say Y here to enable inotify support and the associated system calls. Inotify is a file change notification system and a replacement for dnotify. Inotify fixes numerous shortcomings in dnotify and introduces several new features. It allows monitoring of both files and directories via a single open fd. Other features include multiple file events, one-shot support, and unmount notification.
      For more information, see Documentation/filesystems/inotify.txt
      If unsure, say Y.


  • Option: QUOTA
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Quota support
      If you say Y here, you will be able to set per user limits for disk usage (also called disk quotas). Currently, it works for the ext2, ext3, and reiserfs file system. ext3 also supports journalled quotas for which you don't need to run quotacheck(8) after an unclean shutdown. For further details, read the Quota mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>, or the documentation provided with the quota tools. Probably the quota support is only useful for multi user systems. If unsure, say N.


  • Option: QFMT_V1
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Old quota format support
    • depends on QUOTA
      This quota format was (is) used by kernels earlier than 2.4.22. If you have quota working and you don't want to convert to new quota format say Y here.


  • Option: QFMT_V2
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Quota format v2 support
    • depends on QUOTA
      This quota format allows using quotas with 32-bit UIDs/GIDs. If you need this functionality say Y here.


  • Option: QUOTACTL
    • Kernel Versions: 2.6.15.6 ...
    • (on/off)
    • depends on XFS_QUOTA || QUOTA
    • default y


  • Option: DNOTIFY
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Dnotify support if EMBEDDED
    • default y
      Dnotify is a directory-based per-fd file change notification system that uses signals to communicate events to user-space. There exist superior alternatives, but some applications may still rely on dnotify.
      Because of this, if unsure, say Y.


  • Option: AUTOFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Kernel automounter support
      The automounter is a tool to automatically mount remote file systems on demand. This implementation is partially kernel-based to reduce overhead in the already-mounted case; this is unlike the BSD automounter (amd), which is a pure user space daemon.
      To use the automounter you need the user-space tools from the autofs package; you can find the location in <file:Documentation/Changes>. You also want to answer Y to "NFS file system support", below.
      If you want to use the newer version of the automounter with more features, say N here and say Y to "Kernel automounter v4 support", below.
      To compile this support as a module, choose M here: the module will be called autofs.
      If you are not a part of a fairly large, distributed network, you probably do not need an automounter, and can say N here.


  • Option: AUTOFS4_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Kernel automounter version 4 support (also supports v3)
      The automounter is a tool to automatically mount remote file systems on demand. This implementation is partially kernel-based to reduce overhead in the already-mounted case; this is unlike the BSD automounter (amd), which is a pure user space daemon.
      To use the automounter you need the user-space tools from <ftp://ftp.kernel.org/pub/linux/daemons/autofs/v4/>; you also want to answer Y to "NFS file system support", below.
      To compile this support as a module, choose M here: the module will be called autofs4. You will need to add "alias autofs autofs4" to your modules configuration file.
      If you are not a part of a fairly large, distributed network or don't have a laptop which needs to dynamically reconfigure to the local network, you probably do not need an automounter, and can say N here.


  • Option: FUSE_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Filesystem in Userspace support
      With FUSE it is possible to implement a fully functional filesystem in a userspace program.
      There's also companion library: libfuse. This library along with utilities is available from the FUSE homepage: <http://fuse.sourceforge.net/>
      See <file:Documentation/filesystems/fuse.txt> for more information. See <file:Documentation/Changes> for needed library/utility version.
      If you want to develop a userspace FS, or if you want to use a filesystem based on FUSE, answer Y or M.

CD-ROM/DVD FilesystemsEdit

  • Option: ISO9660_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) ISO 9660 CDROM file system support
      This is the standard file system used on CD-ROMs. It was previously known as "High Sierra File System" and is called "hsfs" on other Unix systems. The so-called Rock-Ridge extensions which allow for long Unix filenames and symbolic links are also supported by this driver. If you have a CD-ROM drive and want to do more with it than just listen to audio CDs and watch its LEDs, say Y (and read <file:Documentation/filesystems/isofs.txt> and the CD-ROM-HOWTO, available from <http://www.tldp.org/docs.html#howto>), thereby enlarging your kernel by about 27 KB; otherwise say N.
      To compile this file system support as a module, choose M here: the module will be called isofs.


  • Option: JOLIET
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Microsoft Joliet CDROM extensions
    • depends on ISO9660_FS
    • select NLS
      Joliet is a Microsoft extension for the ISO 9660 CD-ROM file system which allows for long filenames in unicode format (unicode is the new 16 bit character code, successor to ASCII, which encodes the characters of almost all languages of the world; see <http://www.unicode.org/> for more information). Say Y here if you want to be able to read Joliet CD-ROMs under Linux.


  • Option: ZISOFS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Transparent decompression extension
    • depends on ISO9660_FS
    • select ZLIB_INFLATE
      This is a Linux-specific extension to RockRidge which lets you store data in compressed form on a CD-ROM and have it transparently decompressed when the CD-ROM is accessed. See <http://www.kernel.org/pub/linux/utils/fs/zisofs/> for the tools necessary to create such a filesystem. Say Y here if you want to be able to read such compressed CD-ROMs.


  • Option: ZISOFS_FS
    • Kernel Versions: 2.6.15.6 ...
for fs/nls/Config.in
    • (on/off/module)
    • depends on ZISOFS
    • default ISO9660_FS


  • Option: UDF_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) UDF file system support
      This is the new file system used on some CD-ROMs and DVDs. Say Y if you intend to mount DVD discs or CDRW's written in packet mode, or if written to by other UDF utilities, such as DirectCD. Please read <file:Documentation/filesystems/udf.txt>.
      To compile this file system support as a module, choose M here: the module will be called udf.
      If unsure, say N.


  • Option: UDF_NLS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off)
    • default y
    • depends on (UDF_FS=m && NLS) || (UDF_FS=y && NLS=y)


DOS/FAT/NT FilesystemsEdit

FAT (VFAT)Edit

  • Option: FAT_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Support for FAT Partations, VFAT
    • select NLS
    • Requirements:
      • NLS: native language support is required for VFAT to work properly. ADD (iso8859-1) Default NLS Option, Codepage 437 (United States, Canada), NLS ISO 8859-1 (Latin 1; Western European Languages).
        • Without this or similar setting VFAT will install, but will not work.
      If you want to use one of the FAT-based file systems (the MS-DOS and VFAT (Windows 95) file systems), then you must say Y or M here to include FAT support. You will then be able to mount partitions or diskettes with FAT-based file systems and transparently access the files on them, i.e. MSDOS files will look and behave just like all other Unix files.
      This FAT support is not a file system in itself, it only provides the foundation for the other file systems. You will have to say Y or M to at least one of "MSDOS fs support" or "VFAT fs support" in order to make use of it.
      Another way to read and write MSDOS floppies and hard drive partitions from within Linux (but not transparently) is with the mtools ("man mtools") program suite. You don't need to say Y here in order to do that.
      If you need to move large files on floppies between a DOS and a Linux box, say Y here, mount the floppy under Linux with an MSDOS file system and use GNU tar's M option. GNU tar is a program available for Unix and DOS ("man tar" or "info tar").
      It is now also becoming possible to read and write compressed FAT file systems; read <file:Documentation/filesystems/fat_cvf.txt> for details.
      The FAT support will enlarge your kernel by about 37 KB. If unsure, say Y.
      To compile this as a module, choose M here: the module will be called fat. Note that if you compile the FAT support as a module, you cannot compile any of the FAT-based file systems into the kernel—they will have to be modules as well.


  • Option: MSDOS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) MSDOS fs support
    • select FAT_FS
      This allows you to mount MSDOS partitions of your hard drive (unless they are compressed; to access compressed MSDOS partitions under Linux, you can either use the DOS emulator DOSEMU, described in the DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>, or try dmsdosfs in <ftp://ibiblio.org/pub/Linux/system/filesystems/dosfs/>. If you intend to use dosemu with a non-compressed MSDOS partition, say Y here) and MSDOS floppies. This means that file access becomes transparent, i.e. the MSDOS files look and behave just like all other Unix files.
      If you have Windows 95 or Windows NT installed on your MSDOS partitions, you should use the VFAT file system (say Y to "VFAT fs support" below), or you will not be able to see the long filenames generated by Windows 95 / Windows NT.
      This option will enlarge your kernel by about 7 KB. If unsure, answer Y. This will only work if you said Y to "DOS FAT fs support" as well. To compile this as a module, choose M here: the module will be called msdos.


  • Option: VFAT_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) VFAT (Windows-95) fs support
    • select FAT_FS
      This option provides support for normal Windows file systems with long filenames. That includes non-compressed FAT-based file systems used by Windows 95, Windows 98, Windows NT 4.0, and the Unix programs from the mtools package.
      The VFAT support enlarges your kernel by about 10 KB and it only works if you said Y to the "DOS FAT fs support" above. Please read the file <file:Documentation/filesystems/vfat.txt> for details. If unsure, say Y.
      To compile this as a module, choose M here: the module will be called vfat.


  • Option: FAT_DEFAULT_CODEPAGE
    • Kernel Versions: 2.6.15.6 ...

"Default codepage for FAT"

    • depends on MSDOS_FS || VFAT_FS
    • default 437
      This option should be set to the codepage of your FAT filesystems. It can be overridden with the "codepage" mount option. See <file:Documentation/filesystems/vfat.txt> for more information.


  • Option: FAT_DEFAULT_IOCHARSET
    • Kernel Versions: 2.6.15.6 ...

"Default iocharset for FAT"

    • depends on VFAT_FS
    • default "iso8859-1"
      Set this to the default input/output character set you'd like FAT to use. It should probably match the character set that most of your FAT filesystems use, and can be overridden with the "iocharset" mount option for FAT filesystems. Note that "utf8" is not recommended for FAT filesystems. If unsure, you shouldn't set "utf8" here. See <file:Documentation/filesystems/vfat.txt> for more information.


NTFSEdit

  • Option: NTFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) NTFS file system support
    • select NLS
      NTFS is the file system of Microsoft Windows NT, 2000, XP and 2003.
      Saying Y or M here enables read support. There is partial, but safe, write support available. For write support you must also say Y to "NTFS write support" below.
      There are also a number of user-space tools available, called ntfsprogs. These include ntfsundelete and ntfsresize, that work without NTFS support enabled in the kernel.
      This is a rewrite from scratch of Linux NTFS support and replaced the old NTFS code starting with Linux 2.5.11. A backport to the Linux 2.4 kernel series is separately available as a patch from the project web site.
      For more information see <file:Documentation/filesystems/ntfs.txt> and <http://linux-ntfs.sourceforge.net/>.
      To compile this file system support as a module, choose M here: the module will be called ntfs.
      If you are not using Windows NT, 2000, XP or 2003 in addition to Linux on your computer it is safe to say N.


  • Option: NTFS_DEBUG
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) NTFS debugging support
    • depends on NTFS_FS
      If you are experiencing any problems with the NTFS file system, say Y here. This will result in additional consistency checks to be performed by the driver as well as additional debugging messages to be written to the system log. Note that debugging messages are disabled by default. To enable them, supply the option debug_msgs=1 at the kernel command line when booting the kernel or as an option to insmod when loading the ntfs module. Once the driver is active, you can enable debugging messages by doing (as root): echo 1 > /proc/sys/fs/ntfs-debug Replacing the "1" with "0" would disable debug messages.
      If you leave debugging messages disabled, this results in little overhead, but enabling debug messages results in very significant slowdown of the system.
      When reporting bugs, please try to have available a full dump of debugging messages while the misbehaviour was occurring.


  • Option: NTFS_RW
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) NTFS write support
    • depends on NTFS_FS
      This enables the partial, but safe, write support in the NTFS driver.
      The only supported operation is overwriting existing files, without changing the file length. No file or directory creation, deletion or renaming is possible. Note only non-resident files can be written to so you may find that some very small files (<500 bytes or so) cannot be written to.
      While we cannot guarantee that it will not damage any data, we have so far not received a single report where the driver would have damaged someones data so we assume it is perfectly safe to use.
      Note: While write support is safe in this version (a rewrite from scratch of the NTFS support), it should be noted that the old NTFS write support, included in Linux 2.5.10 and before (since 1997), is not safe.
      This is currently useful with TopologiLinux. TopologiLinux is run on top of any DOS/Microsoft Windows system without partitioning your hard disk. Unlike other Linux distributions TopologiLinux does not need its own partition. For more information see <http://topologi-linux.sourceforge.net/>
      It is perfectly safe to say N here.


Pseudo filesystemsEdit

PROC FSEdit

  • Option: PROC_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) /proc file system support
    • Highly Recommended
      This is a virtual file system providing information about the status of the system. "Virtual" means that it doesn't take up any space on your hard disk: the files are created on the fly by the kernel when you try to access them. Also, you cannot read the files with older version of the program less: you need to use more or cat.
      It's totally cool; for example, "cat /proc/interrupts" gives information about what the different IRQs are used for at the moment (there is a small number of Interrupt ReQuest lines in your computer that are used by the attached devices to gain the CPU's attention—often a source of trouble if two devices are mistakenly configured to use the same IRQ). The program procinfo to display some information about your system gathered from the /proc file system.
      Before you can use the /proc file system, it has to be mounted, meaning it has to be given a location in the directory hierarchy. That location should be /proc. A command such as "mount -t proc proc /proc" or the equivalent line in /etc/fstab does the job.
      The /proc file system is explained in the file <file:Documentation/filesystems/proc.txt> and on the proc(5) manpage ("man 5 proc").
      This option will enlarge your kernel by about 67 KB. Several programs depend on this, so everyone should say Y here.


  • Option: PROC_KCORE
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) /proc/kcore support if !ARM
    • depends on PROC_FS && MMU


  • Option: PROC_VMCORE
    • Kernel Versions: 2.6.15.6 ... bool /proc/vmcore support (EXPERIMENTAL) depends on PROC_FS && EMBEDDED && EXPERIMENTAL && CRASH_DUMP help Exports the dump image of crashed kernel in ELF format.


SYSFSEdit

  • Option: SYSFS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) sysfs file system support if EMBEDDED
    • default y

sysfs filesystem is a virtual filesystem that the kernel uses to internal kernel objects, their attributes, and their to one another.

can use sysfs to ascertain useful information about the running , such as the devices the kernel has discovered on each bus and driver each is bound to. sysfs can also be used to tune devices other kernel subsystems.

system agents rely on the information in sysfs to operate. /sbin/hotplug uses device and object attributes in sysfs to assist in policy decisions, like persistantly naming devices.

is currently used by the block subsystem to mount the root . If sysfs is disabled you must specify the boot device on kernel boot command line via its major and minor numbers. For , "root=03:01" for /dev/hda1.

of embedded systems may wish to say N here to conserve space.


TMPFSEdit

  • Option: TMPFS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Virtual memory file system support (former shm fs)
      Tmpfs is a file system which keeps all files in virtual memory.
      Everything in tmpfs is temporary in the sense that no files will be created on your hard drive. The files live in memory and swap space. If you unmount a tmpfs instance, everything stored therein is lost.
      See <file:Documentation/filesystems/tmpfs.txt> for details.


  • Option: HUGETLBFS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) HugeTLB file system support
    • depends X86 || IA64 || PPC64 || SPARC64 || SUPERH || BROKEN


  • Option: HUGETLB_PAGE
    • Kernel Versions: 2.6.15.6 ...

_bool HUGETLBFS

RAMFSEdit

  • Option: RAMFS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off)
    • default y
      Ramfs is a file system which keeps all files in RAM. It allows read and write access.
      It is more of an programming example than a usable file system. If you need a file system which lives in RAM with limit checking use tmpfs.
      To compile this as a module, choose M here: the module will be called ramfs.


  • Option: RELAYFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Relayfs file system support
      Relayfs is a high-speed data relay filesystem designed to provide an efficient mechanism for tools and facilities to relay large amounts of data from kernel space to user space.
      To compile this code as a module, choose M here: the module will be called relayfs.
      If unsure, say N.


Miscellaneous filesystemsEdit

  • Option: ADFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) ADFS file system support (EXPERIMENTAL)
    • depends on EXPERIMENTAL
      The Acorn Disc Filing System is the standard file system of the RiscOS operating system which runs on Acorn's ARM-based Risc PC systems and the Acorn Archimedes range of machines. If you say Y here, Linux will be able to read from ADFS partitions on hard drives and from ADFS-formatted floppy discs. If you also want to be able to write to those devices, say Y to "ADFS write support" below.
      The ADFS partition should be the first partition (i.e., /dev/[hs]d?1) on each of your drives. Please read the file <file:Documentation/filesystems/adfs.txt> for further details.
      To compile this code as a module, choose M here: the module will be called adfs.
      If unsure, say N.


  • Option: ADFS_FS_RW
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) ADFS write support (DANGEROUS)
    • depends on ADFS_FS
      If you say Y here, you will be able to write to ADFS partitions on hard drives and ADFS-formatted floppy disks. This is experimental codes, so if you're unsure, say N.


  • Option: AFFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Amiga FFS file system support (EXPERIMENTAL)
    • depends on EXPERIMENTAL
      The Fast File System (FFS) is the common file system used on hard disks by Amiga(tm) systems since AmigaOS Version 1.3 (34.20). Say Y if you want to be able to read and write files from and to an Amiga FFS partition on your hard drive. Amiga floppies however cannot be read with this driver due to an incompatibility of the floppy controller used in an Amiga and the standard floppy controller in PCs and workstations. Read <file:Documentation/filesystems/affs.txt> and <file:fs/affs/Changes>.
      With this driver you can also mount disk files used by Bernd Schmidt's Un*X Amiga Emulator (<http://www.freiburg.linux.de/~uae/>). If you want to do this, you will also need to say Y or M to "Loop device support", above.
      To compile this file system support as a module, choose M here: the module will be called affs. If unsure, say N.


  • Option: HFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Apple Macintosh file system support (EXPERIMENTAL)
    • depends on EXPERIMENTAL
    • select NLS
      If you say Y here, you will be able to mount Macintosh-formatted floppy disks and hard drive partitions with full read-write access. Please read <file:fs/hfs/HFS.txt> to learn about the available mount options.
      To compile this file system support as a module, choose M here: the module will be called hfs.


  • Option: HFSPLUS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Apple Extended HFS file system support
    • select NLS
    • select NLS_UTF8
      If you say Y here, you will be able to mount extended format Macintosh-formatted hard drive partitions with full read-write access.
      This file system is often called HFS+ and was introduced with MacOS 8. It includes all Mac specific filesystem data such as data forks and creator codes, but it also has several UNIX style features such as file ownership and permissions.


  • Option: BEFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) BeOS file system (BeFS) support (read only) (EXPERIMENTAL)
    • depends on EXPERIMENTAL
    • select NLS
      The BeOS File System (BeFS) is the native file system of Be, Inc's BeOS. Notable features include support for arbitrary attributes on files and directories, and database-like indeces on selected attributes. (Also note that this driver doesn't make those features available at this time). It is a 64 bit filesystem, so it supports extremly large volumes and files.
      If you use this filesystem, you should also say Y to at least one of the NLS (native language support) options below.
      If you don't know what this is about, say N.
      To compile this as a module, choose M here: the module will be called befs.


  • Option: BEFS_DEBUG
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Debug BeFS
    • depends on BEFS_FS
      If you say Y here, you can use the 'debug' mount option to enable debugging output from the driver.


  • Option: BFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) BFS file system support (EXPERIMENTAL)
    • depends on EXPERIMENTAL
      Boot File System (BFS) is a file system used under SCO UnixWare to allow the bootloader access to the kernel image and other important files during the boot process. It is usually mounted under /stand and corresponds to the slice marked as "STAND" in the UnixWare partition. You should say Y if you want to read or write the files on your /stand slice from within Linux. You then also need to say Y to "UnixWare slices support", below. More information about the BFS file system is contained in the file <file:Documentation/filesystems/bfs.txt>.
      If you don't know what this is about, say N.
      To compile this as a module, choose M here: the module will be called bfs. Note that the file system of your root partition (the one containing the directory /) cannot be compiled as a module.



  • Option: EFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) EFS file system support (read only) (EXPERIMENTAL)
    • depends on EXPERIMENTAL
      EFS is an older file system used for non-ISO9660 CD-ROMs and hard disk partitions by SGI's IRIX operating system (IRIX 6.0 and newer uses the XFS file system for hard disk partitions however).
      This implementation only offers read-only access. If you don't know what all this is about, it's safe to say N. For more information about EFS see its home page at <http://aeschi.ch.eu.org/efs/>.
      To compile the EFS file system support as a module, choose M here: the module will be called efs.


  • Option: JFFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Journalling Flash File System (JFFS) support
    • depends on MTD
      JFFS is the Journaling Flash File System developed by Axis Communications in Sweden, aimed at providing a crash/powerdown-safe file system for disk-less embedded devices. Further information is available at (<http://developer.axis.com/software/jffs/>).


  • Option: JFFS_FS_VERBOSE
    • Kernel Versions: 2.6.15.6 ...

"JFFS debugging verbosity (0 = quiet, 3 = noisy)"

    • depends on JFFS_FS
    • default "0"
      Determines the verbosity level of the JFFS debugging messages.


  • Option: JFFS_PROC_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFFS stats available in /proc filesystem
    • depends on JFFS_FS && PROC_FS
      Enabling this option will cause statistics from mounted JFFS file systems to be made available to the user in the /proc/fs/jffs/ directory.


  • Option: JFFS2_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Journalling Flash File System v2 (JFFS2) support
    • select CRC32
    • depends on MTD
      JFFS2 is the second generation of the Journalling Flash File System for use on diskless embedded devices. It provides improved wear levelling, compression and support for hard links. You cannot use this on normal block devices, only on 'MTD' devices.
      Further information on the design and implementation of JFFS2 is available at <http://sources.redhat.com/jffs2/>.


  • Option: JFFS2_FS_DEBUG
    • Kernel Versions: 2.6.15.6 ...

"JFFS2 debugging verbosity (0 = quiet, 2 = noisy)"

    • depends on JFFS2_FS
    • default "0"
      This controls the amount of debugging messages produced by the JFFS2 code. Set it to zero for use in production systems. For evaluation, testing and debugging, it's advisable to set it to one. This will enable a few assertions and will print debugging messages at the KERN_DEBUG loglevel, where they won't normally be visible. Level 2 is unlikely to be useful - it enables extra debugging in certain areas which at one point needed debugging, but when the bugs were located and fixed, the detailed messages were relegated to level 2.
      If reporting bugs, please try to have available a full dump of the messages at debug level 1 while the misbehaviour was occurring.


  • Option: JFFS2_FS_WRITEBUFFER
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFFS2 write-buffering support
    • depends on JFFS2_FS
    • default y
      This enables the write-buffering support in JFFS2.
      This functionality is required to support JFFS2 on the following types of flash devices: - NAND flash - NOR flash with transparent ECC - DataFlash


  • Option: JFFS2_SUMMARY
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFFS2 summary support (EXPERIMENTAL)
    • depends on JFFS2_FS && EXPERIMENTAL
    • default n
      This feature makes it possible to use summary information for faster filesystem mount.
      The summary information can be inserted into a filesystem image by the utility 'sumtool'.
      If unsure, say 'N'.


  • Option: JFFS2_COMPRESSION_OPTIONS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Advanced compression options for JFFS2
    • depends on JFFS2_FS
    • default n
      Enabling this option allows you to explicitly choose which compression modules, if any, are enabled in JFFS2. Removing compressors and mean you cannot read existing file systems, and enabling experimental compressors can mean that you write a file system which cannot be read by a standard kernel.
      If unsure, you should _definitely_ say 'N'.


  • Option: JFFS2_ZLIB
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFFS2 ZLIB compression support if JFFS2_COMPRESSION_OPTIONS
    • select ZLIB_INFLATE
    • select ZLIB_DEFLATE
    • depends on JFFS2_FS
    • default y help Zlib is designed to be a free, general-purpose, legally unencumbered, lossless data-compression library for use on virtually any computer hardware and operating system. See <http://www.gzip.org/zlib/> for further information.
      Say 'Y' if unsure.


  • Option: JFFS2_RTIME
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFFS2 RTIME compression support if JFFS2_COMPRESSION_OPTIONS
    • depends on JFFS2_FS
    • default y help Rtime does manage to recompress already-compressed data. Say 'Y' if unsure.


  • Option: JFFS2_RUBIN
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) JFFS2 RUBIN compression support if JFFS2_COMPRESSION_OPTIONS
    • depends on JFFS2_FS
    • default n help RUBINMIPS and DYNRUBIN compressors. Say 'N' if unsure.

prompt "JFFS2 default compression mode" if JFFS2_COMPRESSION_OPTIONS default JFFS2_CMODE_PRIORITY depends on JFFS2_FS help You can set here the default compression mode of JFFS2 from the available compression modes. Don't touch if unsure.


  • Option: JFFS2_CMODE_NONE
    • Kernel Versions: 2.6.15.6 ... bool no compression help Uses no compression.


  • Option: JFFS2_CMODE_PRIORITY
    • Kernel Versions: 2.6.15.6 ... bool priority help Tries the compressors in a predefinied order and chooses the first successful one.


  • Option: JFFS2_CMODE_SIZE
    • Kernel Versions: 2.6.15.6 ... bool size (EXPERIMENTAL) help Tries all compressors and chooses the one which has the smallest result.



  • Option: CRAMFS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Compressed ROM file system support (cramfs)
    • select ZLIB_INFLATE
      Saying Y here includes support for CramFs (Compressed ROM File System). CramFs is designed to be a simple, small, and compressed file system for ROM based embedded systems. CramFs is read-only, limited to 256MB file systems (with 16MB files), and doesn't support 16/32 bits uid/gid, hard links and timestamps.
      See <file:Documentation/filesystems/cramfs.txt> and <file:fs/cramfs/README> for further information.
      To compile this as a module, choose M here: the module will be called cramfs. Note that the root file system (the one containing the directory /) cannot be compiled as a module.
      If unsure, say N.


  • Option: VXFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) FreeVxFS file system support (VERITAS VxFS(TM) compatible)
      FreeVxFS is a file system driver that support the VERITAS VxFS(TM) file system format. VERITAS VxFS(TM) is the standard file system of SCO UnixWare (and possibly others) and optionally available for Sunsoft Solaris, HP-UX and many other operating systems. Currently only readonly access is supported.
      NOTE: the file system type as used by mount(1), mount(2) and fstab(5) is 'vxfs' as it describes the file system format, not the actual driver.
      To compile this as a module, choose M here: the module will be called freevxfs. If unsure, say N.



  • Option: HPFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) OS/2 HPFS file system support
      OS/2 is IBM's operating system for PC's, the same as Warp, and HPFS is the file system used for organizing files on OS/2 hard disk partitions. Say Y if you want to be able to read files from and write files to an OS/2 HPFS partition on your hard drive. OS/2 floppies however are in regular MSDOS format, so you don't need this option in order to be able to read them. Read <file:Documentation/filesystems/hpfs.txt>.
      To compile this file system support as a module, choose M here: the module will be called hpfs. If unsure, say N.



  • Option: QNX4FS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) QNX4 file system support (read only)
      This is the file system used by the real-time operating systems QNX 4 and QNX 6 (the latter is also called QNX RTP). Further information is available at <http://www.qnx.com/>. Say Y if you intend to mount QNX hard disks or floppies. Unless you say Y to "QNX4FS read-write support" below, you will only be able to read these file systems.
      To compile this file system support as a module, choose M here: the module will be called qnx4.
      If you don't know whether you need it, then you don't need it: answer N.


  • Option: QNX4FS_RW
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) QNX4FS write support (DANGEROUS)
    • depends on QNX4FS_FS && EXPERIMENTAL && BROKEN
      Say Y if you want to test write support for QNX4 file systems.
      It's currently broken, so for now: answer N.



  • Option: SYSV_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) System V/Xenix/V7/Coherent file system support
      SCO, Xenix and Coherent are commercial Unix systems for Intel machines, and Version 7 was used on the DEC PDP-11. Saying Y here would allow you to read from their floppies and hard disk partitions.
      If you have floppies or hard disk partitions like that, it is likely that they contain binaries from those other Unix systems; in order to run these binaries, you will want to install linux-abi which is a set of kernel modules that lets you run SCO, Xenix, Wyse, UnixWare, Dell Unix and System V programs under Linux. It is available via FTP (user: ftp) from <ftp://ftp.openlinux.org/pub/people/hch/linux-abi/>). NOTE: that will work only for binaries from Intel-based systems; PDP ones will have to wait until somebody ports Linux to -11 ;-)
      If you only intend to mount files from some other Unix over the network using NFS, you don't need the System V file system support (but you need NFS file system support obviously).
      Note that this option is generally not needed for floppies, since a good portable way to transport files and directories between unixes (and even other operating systems) is given by the tar program ("man tar" or preferably "info tar"). Note also that this option has nothing whatsoever to do with the option "System V IPC". Read about the System V file system in <file:Documentation/filesystems/sysv-fs.txt>. Saying Y here will enlarge your kernel by about 27 KB.
      To compile this as a module, choose M here: the module will be called sysv.
      If you haven't heard about all of this before, it's safe to say N.



  • Option: UFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) UFS file system support (read only)
      BSD and derivate versions of Unix (such as SunOS, FreeBSD, NetBSD, OpenBSD and NeXTstep) use a file system called UFS. Some System V Unixes can create and mount hard disk partitions and diskettes using this file system as well. Saying Y here will allow you to read from these partitions; if you also want to write to them, say Y to the experimental "UFS file system write support", below. Please read the file <file:Documentation/filesystems/ufs.txt> for more information.
      The recently released UFS2 variant (used in FreeBSD 5.x) is READ-ONLY supported.
      If you only intend to mount files from some other Unix over the network using NFS, you don't need the UFS file system support (but you need NFS file system support obviously).
      Note that this option is generally not needed for floppies, since a good portable way to transport files and directories between unixes (and even other operating systems) is given by the tar program ("man tar" or preferably "info tar").
      When accessing NeXTstep files, you may need to convert them from the NeXT character set to the Latin1 character set; use the program recode ("info recode") for this purpose.
      To compile the UFS file system support as a module, choose M here: the module will be called ufs.
      If you haven't heard about all of this before, it's safe to say N.


  • Option: UFS_FS_WRITE
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) UFS file system write support (DANGEROUS)
    • depends on UFS_FS && EXPERIMENTAL
      Say Y here if you want to try writing to UFS partitions. This is experimental, so you should back up your UFS partitions beforehand.


Network File SystemsEdit

    • depends on NET


  • Option: NFS_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) NFS file system support
    • depends on INET
    • select LOCKD
    • select SUNRPC
    • select NFS_ACL_SUPPORT if NFS_V3_ACL
      If you are connected to some other (usually local) Unix computer (using SLIP, PLIP, PPP or Ethernet) and want to mount files residing on that computer (the NFS server) using the Network File Sharing protocol, say Y. "Mounting files" means that the client can access the files with usual UNIX commands as if they were sitting on the client's hard disk. For this to work, the server must run the programs nfsd and mountd (but does not need to have NFS file system support enabled in its kernel). NFS is explained in the Network Administrator's Guide, available from <http://www.tldp.org/docs.html#guide>, on its man page: "man nfs", and in the NFS-HOWTO.
      A superior but less widely used alternative to NFS is provided by the Coda file system; see "Coda file system support" below.
      If you say Y here, you should have said Y to TCP/IP networking also. This option would enlarge your kernel by about 27 KB.
      To compile this file system support as a module, choose M here: the module will be called nfs.
      If you are configuring a diskless machine which will mount its root file system over NFS at boot time, say Y here and to "Kernel level IP autoconfiguration" above and to "Root file system on NFS" below. You cannot compile this driver as a module in this case. There are two packages designed for booting diskless machines over the net: netboot, available from <http://ftp1.sourceforge.net/netboot/>, and Etherboot, available from <http://ftp1.sourceforge.net/etherboot/>.
      If you don't know what all this is about, say N.


  • Option: NFS_V3
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Provide NFSv3 client support
    • depends on NFS_FS
      Say Y here if you want your NFS client to be able to speak version 3 of the NFS protocol.
      If unsure, say Y.


  • Option: NFS_V3_ACL
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Provide client support for the NFSv3 ACL protocol extension
    • depends on NFS_V3
      Implement the NFSv3 ACL protocol extension for manipulating POSIX Access Control Lists. The server should also be compiled with the NFSv3 ACL protocol extension; see the CONFIG_NFSD_V3_ACL option.
      If unsure, say N.


  • Option: NFS_V4
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Provide NFSv4 client support (EXPERIMENTAL)
    • depends on NFS_FS && EXPERIMENTAL
    • select RPCSEC_GSS_KRB5
      Say Y here if you want your NFS client to be able to speak the newer version 4 of the NFS protocol.
      Note: Requires auxiliary userspace daemons which may be found on
//www.citi.umich.edu/projects/nfsv4/
    • If unsure, say N.


  • Option: NFS_DIRECTIO
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Allow direct I/O on NFS files (EXPERIMENTAL)
    • depends on NFS_FS && EXPERIMENTAL
      This option enables applications to perform uncached I/O on files in NFS file systems using the O_DIRECT open() flag. When O_DIRECT is set for a file, its data is not cached in the system's page cache. Data is moved to and from user-level application buffers directly. Unlike local disk-based file systems, NFS O_DIRECT has no alignment restrictions.
      Unless your program is designed to use O_DIRECT properly, you are much better off allowing the NFS client to manage data caching for you. Misusing O_DIRECT can cause poor server performance or network storms. This kernel build option defaults OFF to avoid exposing system administrators unwittingly to a potentially hazardous feature.
      For more details on NFS O_DIRECT, see fs/nfs/direct.c.
      If unsure, say N. This reduces the size of the NFS client, and causes open() to return EINVAL if a file residing in NFS is opened with the O_DIRECT flag.


  • Option: NFSD
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) NFS server support
    • depends on INET
    • select LOCKD
    • select SUNRPC
    • select EXPORTFS
    • select NFS_ACL_SUPPORT if NFSD_V3_ACL || NFSD_V2_ACL
      If you want your Linux box to act as an NFS *server*, so that other computers on your local network which support NFS can access certain directories on your box transparently, you have two options: you can use the self-contained user space program nfsd, in which case you should say N here, or you can say Y and use the kernel based NFS server. The advantage of the kernel based solution is that it is faster.
      In either case, you will need support software; the respective locations are given in the file <file:Documentation/Changes> in the NFS section.
      If you say Y here, you will get support for version 2 of the NFS protocol (NFSv2). If you also want NFSv3, say Y to the next question as well.
      Please read the NFS-HOWTO, available from <http://www.tldp.org/docs.html#howto>.
      To compile the NFS server support as a module, choose M here: the module will be called nfsd. If unsure, say N.


  • Option: NFSD_V2_ACL
    • Kernel Versions: 2.6.15.6 ...
    • (on/off)
    • depends on NFSD


  • Option: NFSD_V3
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Provide NFSv3 server support
    • depends on NFSD
      If you would like to include the NFSv3 server as well as the NFSv2 server, say Y here. If unsure, say Y.


  • Option: NFSD_V3_ACL
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Provide server support for the NFSv3 ACL protocol extension
    • depends on NFSD_V3
    • select NFSD_V2_ACL
      Implement the NFSv3 ACL protocol extension for manipulating POSIX Access Control Lists on exported file systems. NFS clients should be compiled with the NFSv3 ACL protocol extension; see the CONFIG_NFS_V3_ACL option. If unsure, say N.


  • Option: NFSD_V4
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Provide NFSv4 server support (EXPERIMENTAL)
    • depends on NFSD_V3 && EXPERIMENTAL
    • select NFSD_TCP
    • select CRYPTO_MD5
    • select CRYPTO
    • select FS_POSIX_ACL
      If you would like to include the NFSv4 server as well as the NFSv2 and NFSv3 servers, say Y here. This feature is experimental, and should only be used if you are interested in helping to test NFSv4. If unsure, say N.


  • Option: NFSD_TCP
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Provide NFS server over TCP support
    • depends on NFSD
    • default y
      If you want your NFS server to support TCP connections, say Y here. TCP connections usually perform better than the default UDP when the network is lossy or congested. If unsure, say Y.


  • Option: ROOT_NFS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Root file system on NFS
    • depends on NFS_FS=y && IP_PNP
      If you want your Linux box to mount its whole root file system (the one containing the directory /) from some other computer over the net via NFS (presumably because your box doesn't have a hard disk), say Y. Read <file:Documentation/nfsroot.txt> for details. It is likely that in this case, you also want to say Y to "Kernel level IP autoconfiguration" so that your box can discover its network address at boot time.
      Most people say N here.


  • Option: LOCKD
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module)


  • Option: LOCKD_V4
    • Kernel Versions: 2.6.15.6 ...
    • (on/off)
    • depends on NFSD_V3 || NFS_V3
    • default y


  • Option: EXPORTFS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module)


  • Option: NFS_ACL_SUPPORT
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module)
    • select FS_POSIX_ACL


  • Option: NFS_COMMON
    • Kernel Versions: 2.6.15.6 ...
    • (on/off)
    • depends on NFSD || NFS_FS
    • default y


  • Option: SUNRPC
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module)


  • Option: SUNRPC_GSS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module)


  • Option: RPCSEC_GSS_KRB5
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Secure RPC: Kerberos V mechanism (EXPERIMENTAL)
    • depends on SUNRPC && EXPERIMENTAL
    • select SUNRPC_GSS
    • select CRYPTO
    • select CRYPTO_MD5
    • select CRYPTO_DES
      Provides for secure RPC calls by means of a gss-api mechanism based on Kerberos V5. This is required for NFSv4.
      Note: Requires an auxiliary userspace daemon which may be found on
//www.citi.umich.edu/projects/nfsv4/
    • If unsure, say N.


  • Option: RPCSEC_GSS_SPKM3
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Secure RPC: SPKM3 mechanism (EXPERIMENTAL)
    • depends on SUNRPC && EXPERIMENTAL
    • select SUNRPC_GSS
    • select CRYPTO
    • select CRYPTO_MD5
    • select CRYPTO_DES
      Provides for secure RPC calls by means of a gss-api mechanism based on the SPKM3 public-key mechanism.
      Note: Requires an auxiliary userspace daemon which may be found on http://www.citi.umich.edu/projects/nfsv4/
      If unsure, say N.


  • Option: SMB_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) SMB file system support (to mount Windows shares etc.)
    • depends on INET
    • select NLS
      SMB (Server Message Block) is the protocol Windows for Workgroups (WfW), Windows 95/98, Windows NT and OS/2 Lan Manager use to share files and printers over local networks. Saying Y here allows you to mount their file systems (often called "shares" in this context) and access them just like any other Unix directory. Currently, this works only if the Windows machines use TCP/IP as the underlying transport protocol, and not NetBEUI. For details, read <file:Documentation/filesystems/smbfs.txt> and the SMB-HOWTO, available from <http://www.tldp.org/docs.html#howto>.
      Note: if you just want your box to act as an SMB *server* and make files and printing services available to Windows clients (which need to have a TCP/IP stack), you don't need to say Y here; you can use the program SAMBA (available from <ftp://ftp.samba.org/pub/samba/>) for that.
      General information about how to connect Linux, Windows machines and Macs is on the WWW at <http://www.eats.com/linux_mac_win.html>.
      To compile the SMB support as a module, choose M here: the module will be called smbfs. Most people say N, however.


  • Option: SMB_NLS_DEFAULT
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Use a default NLS
    • depends on SMB_FS
      Enabling this will make smbfs use nls translations by default. You need to specify the local charset (CONFIG_NLS_DEFAULT) in the nls settings and you need to give the default nls for the SMB server as CONFIG_SMB_NLS_REMOTE.
      The nls settings can be changed at mount time, if your smbmount supports that, using the codepage and iocharset parameters.
      smbmount from samba 2.2.0 or later supports this.


  • Option: SMB_NLS_REMOTE
    • Kernel Versions: 2.6.15.6 ...

"Default Remote NLS Option"

    • depends on SMB_NLS_DEFAULT
    • default "cp437"
      This setting allows you to specify a default value for which codepage the server uses. If this field is left blank no translations will be done by default. The local codepage/charset default to CONFIG_NLS_DEFAULT.
      The nls settings can be changed at mount time, if your smbmount supports that, using the codepage and iocharset parameters.
      smbmount from samba 2.2.0 or later supports this.


  • Option: CIFS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) CIFS support (advanced network filesystem for Samba, Window and other CIFS compliant servers)
    • depends on INET
    • select NLS
      This is the client VFS module for the Common Internet File System (CIFS) protocol which is the successor to the Server Message Block (SMB) protocol, the native file sharing mechanism for most early PC operating systems. The CIFS protocol is fully supported by file servers such as Windows 2000 (including Windows 2003, NT 4 and Windows XP) as well by Samba (which provides excellent CIFS server support for Linux and many other operating systems). Limited support for Windows ME and similar servers is provided as well. You must use the smbfs client filesystem to access older SMB servers such as OS/2 and DOS.
      The intent of the cifs module is to provide an advanced network file system client for mounting to CIFS compliant servers, including support for dfs (hierarchical name space), secure per-user session establishment, safe distributed caching (oplock), optional packet signing, Unicode and other internationalization improvements, and optional Winbind (nsswitch) integration. You do not need to enable cifs if running only a (Samba) server. It is possible to enable both smbfs and cifs (e.g. if you are using CIFS for accessing Windows 2003 and Samba 3 servers, and smbfs for accessing old servers). If you need to mount to Samba or Windows from this machine, say Y.


  • Option: CIFS_STATS
    • Kernel Versions: 2.6.15.6 ... bool CIFS statistics depends on CIFS help Enabling this option will cause statistics for each server share mounted by the cifs client to be displayed in /proc/fs/cifs/Stats


  • Option: CIFS_STATS2
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) CIFS extended statistics
    • depends on CIFS_STATS
      Enabling this option will allow more detailed statistics on SMB request timing to be displayed in /proc/fs/cifs/DebugData and also allow optional logging of slow responses to dmesg (depending on the value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details). These additional statistics may have a minor effect on performance and memory utilization.
      Unless you are a developer or are doing network performance analysis or tuning, say N.


  • Option: CIFS_XATTR
    • Kernel Versions: 2.6.15.6 ... bool CIFS extended attributes depends on CIFS help Extended attributes are name:value pairs associated with inodes by the kernel or by users (see the attr(5) manual page, or visit <http://acl.bestbits.at/> for details). CIFS maps the name of extended attributes beginning with the user namespace prefix to SMB/CIFS EAs. EAs are stored on Windows servers without the user namespace prefix, but their names are seen by Linux cifs clients prefaced by the user namespace prefix. The system namespace (used by some filesystems to store ACLs) is not supported at this time.
      If unsure, say N.


  • Option: CIFS_POSIX
    • Kernel Versions: 2.6.15.6 ... bool CIFS POSIX Extensions depends on CIFS_XATTR help Enabling this option will cause the cifs client to attempt to negotiate a newer dialect with servers, such as Samba 3.0.5 or later, that optionally can handle more POSIX like (rather than Windows like) file behavior. It also enables support for POSIX ACLs (getfacl and setfacl) to servers (such as Samba 3.10 and later) which can negotiate CIFS POSIX ACL support. If unsure, say N.


  • Option: CIFS_EXPERIMENTAL
    • Kernel Versions: 2.6.15.6 ... bool CIFS Experimental Features (EXPERIMENTAL) depends on CIFS && EXPERIMENTAL help Enables cifs features under testing. These features are experimental and currently include support for writepages (multipage writebehind performance improvements) and directory change notification i.e. fcntl(F_DNOTIFY) as well as some security improvements. Some also depend on setting at runtime the pseudo-file /proc/fs/cifs/Experimental (which is disabled by default). See the file fs/cifs/README for more details.
      If unsure, say N.


  • Option: CIFS_UPCALL
    • Kernel Versions: 2.6.15.6 ... bool CIFS Kerberos/SPNEGO advanced session setup (EXPERIMENTAL) depends on CIFS_EXPERIMENTAL select CONNECTOR help Enables an upcall mechanism for CIFS which will be used to contact userspace helper utilities to provide SPNEGO packaged Kerberos tickets which are needed to mount to certain secure servers (for which more secure Kerberos authentication is required). If unsure, say N.


  • Option: NCP_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) NCP file system support (to mount NetWare volumes)
    • depends on IPX!=n || INET
      NCP (NetWare Core Protocol) is a protocol that runs over IPX and is used by Novell NetWare clients to talk to file servers. It is to IPX what NFS is to TCP/IP, if that helps. Saying Y here allows you to mount NetWare file server volumes and to access them just like any other Unix directory. For details, please read the file <file:Documentation/filesystems/ncpfs.txt> in the kernel source and the IPX-HOWTO from <http://www.tldp.org/docs.html#howto>.
      You do not have to say Y here if you want your Linux box to act as a file *server* for Novell NetWare clients.
      General information about how to connect Linux, Windows machines and Macs is on the WWW at <http://www.eats.com/linux_mac_win.html>.
      To compile this as a module, choose M here: the module will be called ncpfs. Say N unless you are connected to a Novell network.



  • Option: CODA_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Coda file system support (advanced network fs)
    • depends on INET
      Coda is an advanced network file system, similar to NFS in that it enables you to mount file systems of a remote server and access them with regular Unix commands as if they were sitting on your hard disk. Coda has several advantages over NFS: support for disconnected operation (e.g. for laptops), read/write server replication, security model for authentication and encryption, persistent client caches and write back caching.
      If you say Y here, your Linux box will be able to act as a Coda *client*. You will need user level code as well, both for the client and server. Servers are currently user level, i.e. they need no kernel support. Please read <file:Documentation/filesystems/coda.txt> and check out the Coda home page <http://www.coda.cs.cmu.edu/>.
      To compile the coda client support as a module, choose M here: the module will be called coda.


  • Option: CODA_FS_OLD_API
    • Kernel Versions: 2.6.15.6 ...
    • (on/off) Use 96-bit Coda file identifiers
    • depends on CODA_FS
      A new kernel-userspace API had to be introduced for Coda v6.0 to support larger 128-bit file identifiers as needed by the new realms implementation.
      However this new API is not backward compatible with older clients. If you really need to run the old Coda userspace cache manager then say Y. For most cases you probably want to say N.


  • Option: AFS_FS
    • Kernel Versions: 2.6.15.6 ...
for fs/nls/Config.in
    • (on/off/module) Andrew File System support (AFS) (Experimental)
    • depends on INET && EXPERIMENTAL
    • select RXRPC
      If you say Y here, you will get an experimental Andrew File System driver. It currently only supports unsecured read-only AFS access.
      See <file:Documentation/filesystems/afs.txt> for more intormation.
      If unsure, say N.


  • Option: RXRPC
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module)


  • Option: 9P_FS
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Plan 9 Resource Sharing Support (9P2000) (Experimental)
    • depends on INET && EXPERIMENTAL
      If you say Y here, you will get experimental support for Plan 9 resource sharing via the 9P2000 protocol.
      See <http://v9fs.sf.net> for more information.
      If unsure, say N.


Partition TypesEdit





Linux Kernel Configuration

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