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| author |   Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-02-17 17:12:05 +0100 |
|---|---|---|
| committer |   Jonathan Corbet <corbet@lwn.net> | 2020-03-02 14:03:18 -0700 |
| commit | 720c2fc1ec7cb36bfc5326603522bc3955534773 (patch) | |
| tree | c04bfa22dc84c9aa7d9c7e29c7a7b3555129fba6 /Documentation/filesystems/gfs2.rst | |
| parent | docs: filesystems: convert f2fs.txt to ReST (diff) | |
| download | linux-dev-720c2fc1ec7cb36bfc5326603522bc3955534773.tar.xz linux-dev-720c2fc1ec7cb36bfc5326603522bc3955534773.zip | |
docs: filesystems: convert gfs2.txt to ReST
- Add a SPDX header;
- Adjust document title;
- Some whitespace fixes and new line breaks;
- Mark literal blocks as such;
- Add table markups;
- Add it to filesystems/index.rst.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Bob Peterson <rpeterso@redhat.com>
Link: https://lore.kernel.org/r/6d7a296de025bcfed7a229da7f8cc1678944f304.1581955849.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/filesystems/gfs2.rst')
| -rw-r--r-- | Documentation/filesystems/gfs2.rst | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/Documentation/filesystems/gfs2.rst b/Documentation/filesystems/gfs2.rst new file mode 100644 index 000000000000..8d1ab589ce18 --- /dev/null +++ b/Documentation/filesystems/gfs2.rst @@ -0,0 +1,53 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================== +Global File System +================== + +https://fedorahosted.org/cluster/wiki/HomePage + +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 interchangeable inter-node locking mechanisms, the currently +supported mechanisms are: + + 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/ + +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 + +If you are using Fedora, you need to install the gfs2-utils package +and, for lock_dlm, you will also need to install the cman package +and write a cluster.conf as per the documentation. For F17 and above +cman has been replaced by the dlm package. + +GFS2 is not on-disk compatible with previous versions of GFS, but it +is pretty close. + +The following man pages can be found at the URL above: + + ============ ============================================= + fsck.gfs2 to repair a filesystem + gfs2_grow to expand a filesystem online + gfs2_jadd to add journals to a filesystem online + tunegfs2 to manipulate, examine and tune a filesystem + gfs2_convert to convert a gfs filesystem to gfs2 in-place + mkfs.gfs2 to make a filesystem + ============ ============================================= |