Steven Whitehouse
2006-04-21T16:14:05Z

[PATCH 13/16] GFS2: Makefiles and Kconfig

This hooks GFS2 into the kernel's build system. It also adds some
documentation. Note that the dlm has been moved to be under
fs/dlm as per Ingo Molnar's suggestion. This patch series doesn't
include the dlm however as its already in both -mm and the git
tree containing GFS2 at kernel.org.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

Documentation/filesystems/gfs2.txt | 44 +++++++++++++++++++++++++++++++++++
fs/Kconfig | 2 +
fs/Makefile | 2 +
fs/gfs2/Kconfig | 46 +++++++++++++++++++++++++++++++++++++
fs/gfs2/Makefile | 42 +++++++++++++++++++++++++++++++++
5 files changed, 136 insertions(+)

--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -323,6 +323,7 @@ config FS_POSIX_ACL
default n

source "fs/xfs/Kconfig"
+source "fs/gfs2/Kconfig"

config OCFS2_FS
tristate "OCFS2 file system support (EXPERIMENTAL)"
@@ -1824,6 +1825,7 @@ source "fs/partitions/Kconfig"
endmenu

source "fs/nls/Kconfig"
+source "fs/dlm/Kconfig"

endmenu

--- a/fs/Makefile
+++ b/fs/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_SYSFS) += sysfs/
obj-y += devpts/

obj-$(CONFIG_PROFILING) += dcookies.o
+obj-$(CONFIG_DLM) += dlm/

# Do not add any filesystems before this line
obj-$(CONFIG_REISERFS_FS) += reiserfs/
@@ -102,3 +103,4 @@ obj-$(CONFIG_HPPFS) += hppfs/
obj-$(CONFIG_DEBUG_FS) += debugfs/
obj-$(CONFIG_CONFIGFS_FS) += configfs/
obj-$(CONFIG_OCFS2_FS) += ocfs2/
+obj-$(CONFIG_GFS2_FS) += gfs2/
--- /dev/null
+++ b/fs/gfs2/Makefile
@@ -0,0 +1,42 @@
+obj-$(CONFIG_GFS2_FS) += gfs2.o
+gfs2-y := \
+ acl.o \
+ bits.o \
+ bmap.o \
+ daemon.o \
+ dir.o \
+ eaops.o \
+ eattr.o \
+ glock.o \
+ glops.o \
+ inode.o \
+ lm.o \
+ log.o \
+ lops.o \
+ locking.o \
+ lvb.o \
+ main.o \
+ meta_io.o \
+ mount.o \
+ ondisk.o \
+ ops_address.o \
+ ops_dentry.o \
+ ops_export.o \
+ ops_file.o \
+ ops_fstype.o \
+ ops_inode.o \
+ ops_super.o \
+ ops_vm.o \
+ page.o \
+ quota.o \
+ recovery.o \
+ rgrp.o \
+ super.o \
+ sys.o \
+ trans.o \
+ unlinked.o \
+ util.o
+
+obj-$(CONFIG_GFS2_FS_LOCKING_NOLOCK) += locking/nolock/
+obj-$(CONFIG_GFS2_FS_LOCKING_DLM) += locking/dlm/
+
--- /dev/null
+++ b/fs/gfs2/Kconfig
@@ -0,0 +1,46 @@
+config GFS2_FS
+ tristate "GFS2 file system support"
+ default m
+ depends on EXPERIMENTAL
+ select FS_POSIX_ACL
+ select SYSFS
+ 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.
+
+ To use the GFS2 filesystem, you will need to enable one or more of
+ the below locking modules. Documentation and utilities for GFS2 can
+ be found here: http://sources.redhat.com/cluster/gfs/
+
+config GFS2_FS_LOCKING_NOLOCK
+ tristate "GFS2 \"nolock\" locking module"
+ depends on GFS2_FS
+ help
+ Single node locking module for GFS2.
+
+ Use this module if you want to use GFS2 on a single node without
+ its clustering features. You can still take advantage of the
+ large file support, and upgrade to running a full cluster later on
+ if required.
+
+ If you will only be using GFS2 in cluster mode, you do not need this
+ module.
+
+config GFS2_FS_LOCKING_DLM
+ tristate "GFS2 DLM locking module"
+ depends on GFS2_FS
+ select DLM
+ help
+ Multiple node locking module for GFS2
+
+ Most users of GFS2 will require this module. It provides the locking
+ interface between GFS2 and the DLM, which is required to use GFS2
+ in a cluster environment.
+
--- /dev/null
+++ b/Documentation/filesystems/gfs2.txt
@@ -0,0 +1,44 @@
+Global File System
+------------------
+
+http://sources.redhat.com/cluster/
+
+GFS is a cluster file system. It 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
+file system, but also uses a lock module to allow the computers coordinate
+their I/O so file system consistency is maintained. One of the nifty
+features of GFS is perfect consistency -- changes made to the file system
+on one machine show up immediately on all other machines in the cluster.
+
+GFS uses interchangable inter-node locking mechanisms. Different lock
+modules can plug into GFS and each file system selects the appropriate
+lock module at mount time. Lock modules include:
+
+ lock_nolock -- allows gfs to be used as a local file system
+
+ lock_dlm -- uses a distributed lock manager (dlm) for inter-node locking
+ The dlm is found at linux/fs/dlm/
+
+In addition to interfacing with an external locking manager, a gfs lock
+module is responsible for interacting with external cluster management
+systems. Lock_dlm depends on user space cluster management systems found
+at the URL above.
+
+To use gfs as a local file system, no external clustering systems are
+needed, simply:
+
+ $ mkfs -t gfs2 -p lock_nolock -j 1 /dev/block_device
+ $ mount -t gfs2 /dev/block_device /dir
+
+GFS2 is not on-disk compatible with previous versions of GFS.
+
+The following man pages can be found at the URL above:
+ gfs2_mkfs to make a filesystem
+ gfs2_fsck to repair a filesystem
+ gfs2_grow to expand a filesystem online
+ gfs2_jadd to add journals to a filesystem online
+ gfs2_tool to manipulate, examine and tune a filesystem
+ gfs2_quota to examine and change quota values in a filesystem
+ mount.gfs2 to find mount options
+