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authorLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 12:06:16 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 12:06:16 -0400
commit4a61f17378c2cdd9bd8f34ef8bd7422861d0c1f1 (patch)
treea2054556900af8c16fd9f5419f012dcf1ee2995a /Documentation/filesystems
parentd002ec481c24f325ed6cfcb7810d317c015dd1b5 (diff)
parent7ecdb70a0ea436c06540140242bfac6ac3babfc0 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6: (292 commits) [GFS2] Fix endian bug for de_type [GFS2] Initialize SELinux extended attributes at inode creation time. [GFS2] Move logging code into log.c (mostly) [GFS2] Mark nlink cleared so VFS sees it happen [GFS2] Two redundant casts removed [GFS2] Remove uneeded endian conversion [GFS2] Remove duplicate sb reading code [GFS2] Mark metadata reads for blktrace [GFS2] Remove iflags.h, use FS_ [GFS2] Fix code style/indent in ops_file.c [GFS2] streamline-generic_file_-interfaces-and-filemap gfs fix [GFS2] Remove readv/writev methods and use aio_read/aio_write instead (gfs bits) [GFS2] inode-diet: Eliminate i_blksize from the inode structure [GFS2] inode_diet: Replace inode.u.generic_ip with inode.i_private (gfs) [GFS2] Fix typo in last patch [GFS2] Fix direct i/o logic in filemap.c [GFS2] Fix bug in Makefiles for lock modules [GFS2] Remove (extra) fs_subsys declaration [GFS2/DLM] Fix trailing whitespace [GFS2] Tidy up meta_io code ...
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1Global File System
2------------------
3
4http://sources.redhat.com/cluster/
5
6GFS is a cluster file system. It allows a cluster of computers to
7simultaneously use a block device that is shared between them (with FC,
8iSCSI, NBD, etc). GFS reads and writes to the block device like a local
9file system, but also uses a lock module to allow the computers coordinate
10their I/O so file system consistency is maintained. One of the nifty
11features of GFS is perfect consistency -- changes made to the file system
12on one machine show up immediately on all other machines in the cluster.
13
14GFS uses interchangable inter-node locking mechanisms. Different lock
15modules can plug into GFS and each file system selects the appropriate
16lock module at mount time. Lock modules include:
17
18 lock_nolock -- allows gfs to be used as a local file system
19
20 lock_dlm -- uses a distributed lock manager (dlm) for inter-node locking
21 The dlm is found at linux/fs/dlm/
22
23In addition to interfacing with an external locking manager, a gfs lock
24module is responsible for interacting with external cluster management
25systems. Lock_dlm depends on user space cluster management systems found
26at the URL above.
27
28To use gfs as a local file system, no external clustering systems are
29needed, simply:
30
31 $ mkfs -t gfs2 -p lock_nolock -j 1 /dev/block_device
32 $ mount -t gfs2 /dev/block_device /dir
33
34GFS2 is not on-disk compatible with previous versions of GFS.
35
36The following man pages can be found at the URL above:
37 gfs2_fsck to repair a filesystem
38 gfs2_grow to expand a filesystem online
39 gfs2_jadd to add journals to a filesystem online
40 gfs2_tool to manipulate, examine and tune a filesystem
41 gfs2_quota to examine and change quota values in a filesystem
42 mount.gfs2 to help mount(8) mount a filesystem
43 mkfs.gfs2 to make a filesystem