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