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  1 config XFS_FS
  2         tristate "XFS filesystem support"
  3         depends on BLOCK
  4         depends on (64BIT || LBDAF)
  5         select EXPORTFS
  6         select LIBCRC32C
  7         select FS_IOMAP
  8         help
  9           XFS is a high performance journaling filesystem which originated
 10           on the SGI IRIX platform.  It is completely multi-threaded, can
 11           support large files and large filesystems, extended attributes,
 12           variable block sizes, is extent based, and makes extensive use of
 13           Btrees (directories, extents, free space) to aid both performance
 14           and scalability.
 16           Refer to the documentation at <>
 17           for complete details.  This implementation is on-disk compatible
 18           with the IRIX version of XFS.
 20           To compile this file system support as a module, choose M here: the
 21           module will be called xfs.  Be aware, however, that if the file
 22           system of your root partition is compiled as a module, you'll need
 23           to use an initial ramdisk (initrd) to boot.
 25 config XFS_QUOTA
 26         bool "XFS Quota support"
 27         depends on XFS_FS
 28         select QUOTACTL
 29         help
 30           If you say Y here, you will be able to set limits for disk usage on
 31           a per user and/or a per group basis under XFS.  XFS considers quota
 32           information as filesystem metadata and uses journaling to provide a
 33           higher level guarantee of consistency.  The on-disk data format for
 34           quota is also compatible with the IRIX version of XFS, allowing a
 35           filesystem to be migrated between Linux and IRIX without any need
 36           for conversion.
 38           If unsure, say N.  More comprehensive documentation can be found in
 39           README.quota in the xfsprogs package.  XFS quota can be used either
 40           with or without the generic quota support enabled (CONFIG_QUOTA) -
 41           they are completely independent subsystems.
 43 config XFS_POSIX_ACL
 44         bool "XFS POSIX ACL support"
 45         depends on XFS_FS
 46         select FS_POSIX_ACL
 47         help
 48           POSIX Access Control Lists (ACLs) support permissions for users and
 49           groups beyond the owner/group/world scheme.
 51           To learn more about Access Control Lists, visit the POSIX ACLs for
 52           Linux website <>.
 54           If you don't know what Access Control Lists are, say N.
 56 config XFS_RT
 57         bool "XFS Realtime subvolume support"
 58         depends on XFS_FS
 59         help
 60           If you say Y here you will be able to mount and use XFS filesystems
 61           which contain a realtime subvolume.  The realtime subvolume is a
 62           separate area of disk space where only file data is stored.  It was
 63           originally designed to provide deterministic data rates suitable
 64           for media streaming applications, but is also useful as a generic
 65           mechanism for ensuring data and metadata/log I/Os are completely
 66           separated.  Regular file I/Os are isolated to a separate device
 67           from all other requests, and this can be done quite transparently
 68           to applications via the inherit-realtime directory inode flag.
 70           See the xfs man page in section 5 for additional information.
 72           If unsure, say N.
 74 config XFS_WARN
 75         bool "XFS Verbose Warnings"
 76         depends on XFS_FS && !XFS_DEBUG
 77         help
 78           Say Y here to get an XFS build with many additional warnings.
 79           It converts ASSERT checks to WARN, so will log any out-of-bounds
 80           conditions that occur that would otherwise be missed. It is much
 81           lighter weight than XFS_DEBUG and does not modify algorithms and will
 82           not cause the kernel to panic on non-fatal errors.
 84           However, similar to XFS_DEBUG, it is only advisable to use this if you
 85           are debugging a particular problem.
 87 config XFS_DEBUG
 88         bool "XFS Debugging support"
 89         depends on XFS_FS
 90         help
 91           Say Y here to get an XFS build with many debugging features,
 92           including ASSERT checks, function wrappers around macros,
 93           and extra sanity-checking functions in various code paths.
 95           Note that the resulting code will be HUGE and SLOW, and probably
 96           not useful unless you are debugging a particular problem.
 98           Say N unless you are an XFS developer, or you play one on TV.

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