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