# SPDX-License-Identifier: GPL-2.0-only

  config GFS2_FS

  	tristate "GFS2 file system support"

  	select FS_POSIX_ACL

  	select CRC32

  	select LIBCRC32C

  	select QUOTACTL

  	select FS_IOMAP

  	help

  	  A cluster filesystem.

  	  Allows a cluster of computers to simultaneously use a block device
  	  that is shared between them (with FC, iSCSI, NBD, etc...).  GFS reads
  	  and writes to the block device like a local filesystem, but also uses
  	  a lock module to allow the computers coordinate their I/O so
  	  filesystem consistency is maintained.  One of the nifty features of
  	  GFS is perfect consistency -- changes made to the filesystem on one
  	  machine show up immediately on all other machines in the cluster.

  	  To use the GFS2 filesystem in a cluster, you will need to enable
  	  the locking module below. Documentation and utilities for GFS2 can

  	  be found here: http://sources.redhat.com/cluster

  	  The "nolock" lock module is now built in to GFS2 by default. If

  	  you want to use the DLM, be sure to enable IPv4/6 networking.

  
  config GFS2_FS_LOCKING_DLM

  	bool "GFS2 DLM locking"

  	depends on (GFS2_FS!=n) && NET && INET && (IPV6 || IPV6=n) && \

  		CONFIGFS_FS && SYSFS && (DLM=y || DLM=GFS2_FS)

  	help

  	  Multiple node locking module for GFS2

  	  Most users of GFS2 will require this. It provides the locking

  	  interface between GFS2 and the DLM, which is required to use GFS2
  	  in a cluster environment.