1# SPDX-License-Identifier: GPL-2.0-only 2config GFS2_FS 3 tristate "GFS2 file system support" 4 select BUFFER_HEAD 5 select FS_POSIX_ACL 6 select CRC32 7 select LIBCRC32C 8 select QUOTACTL 9 select FS_IOMAP 10 help 11 A cluster filesystem. 12 13 Allows a cluster of computers to simultaneously use a block device 14 that is shared between them (with FC, iSCSI, NBD, etc...). GFS reads 15 and writes to the block device like a local filesystem, but also uses 16 a lock module to allow the computers coordinate their I/O so 17 filesystem consistency is maintained. One of the nifty features of 18 GFS is perfect consistency -- changes made to the filesystem on one 19 machine show up immediately on all other machines in the cluster. 20 21 To use the GFS2 filesystem in a cluster, you will need to enable 22 the locking module below. Documentation and utilities for GFS2 can 23 be found here: http://sources.redhat.com/cluster 24 25 The "nolock" lock module is now built in to GFS2 by default. If 26 you want to use the DLM, be sure to enable IPv4/6 networking. 27 28config GFS2_FS_LOCKING_DLM 29 bool "GFS2 DLM locking" 30 depends on (GFS2_FS!=n) && NET && INET && (IPV6 || IPV6=n) && \ 31 CONFIGFS_FS && SYSFS && (DLM=y || DLM=GFS2_FS) 32 help 33 Multiple node locking module for GFS2 34 35 Most users of GFS2 will require this. It provides the locking 36 interface between GFS2 and the DLM, which is required to use GFS2 37 in a cluster environment. 38