1config GFS2_FS 2 tristate "GFS2 file system support" 3 depends on (64BIT || LBDAF) 4 select FS_POSIX_ACL 5 select CRC32 6 select LIBCRC32C 7 select QUOTACTL 8 select FS_IOMAP 9 help 10 A cluster filesystem. 11 12 Allows a cluster of computers to simultaneously use a block device 13 that is shared between them (with FC, iSCSI, NBD, etc...). GFS reads 14 and writes to the block device like a local filesystem, but also uses 15 a lock module to allow the computers coordinate their I/O so 16 filesystem consistency is maintained. One of the nifty features of 17 GFS is perfect consistency -- changes made to the filesystem on one 18 machine show up immediately on all other machines in the cluster. 19 20 To use the GFS2 filesystem in a cluster, you will need to enable 21 the locking module below. Documentation and utilities for GFS2 can 22 be found here: http://sources.redhat.com/cluster 23 24 The "nolock" lock module is now built in to GFS2 by default. If 25 you want to use the DLM, be sure to enable IPv4/6 networking. 26 27config GFS2_FS_LOCKING_DLM 28 bool "GFS2 DLM locking" 29 depends on (GFS2_FS!=n) && NET && INET && (IPV6 || IPV6=n) && \ 30 CONFIGFS_FS && SYSFS && (DLM=y || DLM=GFS2_FS) 31 help 32 Multiple node locking module for GFS2 33 34 Most users of GFS2 will require this. It provides the locking 35 interface between GFS2 and the DLM, which is required to use GFS2 36 in a cluster environment. 37