GFS: build and documentation

@@ -0,0 +1,45 @@
+obj-$(CONFIG_GFS2_FS) += gfs2.o
+gfs2-y := \
+	acl.o \
+	bits.o \
+	bmap.o \
+	daemon.o \
+	dir.o \
+	eaops.o \
+	eattr.o \
+	glock.o \
+	glops.o \
+	inode.o \
+	ioctl.o \
+	jdata.o \
+	lm.o \
+	log.o \
+	lops.o \
+	lvb.o \
+	main.o \
+	meta_io.o \
+	mount.o \
+	ondisk.o \
+	ops_address.o \
+	ops_dentry.o \
+	ops_export.o \
+	ops_file.o \
+	ops_fstype.o \
+	ops_inode.o \
+	ops_super.o \
+	ops_vm.o \
+	page.o \
+	quota.o \
+	resize.o \
+	recovery.o \
+	rgrp.o \
+	super.o \
+	sys.o \
+	trans.o \
+	unlinked.o \
+	util.o
+
+obj-$(CONFIG_GFS2_FS) += locking/harness/
+obj-$(CONFIG_GFS2_FS) += locking/nolock/
+obj-$(CONFIG_GFS2_FS) += locking/dlm/
+

@@ -105,3 +105,4 @@ obj-$(CONFIG_HPPFS)		+= hppfs/
 obj-$(CONFIG_DEBUG_FS)		+= debugfs/
 obj-$(CONFIG_CONFIGFS_FS)	+= configfs/
 obj-$(CONFIG_OCFS2_FS)		+= ocfs2/
+obj-$(CONFIG_GFS2_FS)		+= gfs2/

@@ -359,6 +359,21 @@ config OCFS2_FS
 	          - POSIX ACLs
 	          - readpages / writepages (not user visible)
 
+config GFS2_FS
+	tristate "GFS2 file system support"
+	depends on DLM
+	select FS_POSIX_ACL
+	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.
+
 config MINIX_FS
 	tristate "Minix fs support"
 	help

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