summaryrefslogtreecommitdiffstats
path: root/kernel/Documentation/filesystems/ocfs2.txt
diff options
context:
space:
mode:
authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/Documentation/filesystems/ocfs2.txt
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/Documentation/filesystems/ocfs2.txt')
-rw-r--r--kernel/Documentation/filesystems/ocfs2.txt106
1 files changed, 106 insertions, 0 deletions
diff --git a/kernel/Documentation/filesystems/ocfs2.txt b/kernel/Documentation/filesystems/ocfs2.txt
new file mode 100644
index 000000000..4c49e5410
--- /dev/null
+++ b/kernel/Documentation/filesystems/ocfs2.txt
@@ -0,0 +1,106 @@
+OCFS2 filesystem
+==================
+OCFS2 is a general purpose extent based shared disk cluster file
+system with many similarities to ext3. It supports 64 bit inode
+numbers, and has automatically extending metadata groups which may
+also make it attractive for non-clustered use.
+
+You'll want to install the ocfs2-tools package in order to at least
+get "mount.ocfs2" and "ocfs2_hb_ctl".
+
+Project web page: http://ocfs2.wiki.kernel.org
+Tools git tree: https://github.com/markfasheh/ocfs2-tools
+OCFS2 mailing lists: http://oss.oracle.com/projects/ocfs2/mailman/
+
+All code copyright 2005 Oracle except when otherwise noted.
+
+CREDITS:
+Lots of code taken from ext3 and other projects.
+
+Authors in alphabetical order:
+Joel Becker <joel.becker@oracle.com>
+Zach Brown <zach.brown@oracle.com>
+Mark Fasheh <mfasheh@suse.com>
+Kurt Hackel <kurt.hackel@oracle.com>
+Tao Ma <tao.ma@oracle.com>
+Sunil Mushran <sunil.mushran@oracle.com>
+Manish Singh <manish.singh@oracle.com>
+Tiger Yang <tiger.yang@oracle.com>
+
+Caveats
+=======
+Features which OCFS2 does not support yet:
+ - Directory change notification (F_NOTIFY)
+ - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease)
+
+Mount options
+=============
+
+OCFS2 supports the following mount options:
+(*) == default
+
+barrier=1 This enables/disables barriers. barrier=0 disables it,
+ barrier=1 enables it.
+errors=remount-ro(*) Remount the filesystem read-only on an error.
+errors=panic Panic and halt the machine if an error occurs.
+intr (*) Allow signals to interrupt cluster operations.
+nointr Do not allow signals to interrupt cluster
+ operations.
+noatime Do not update access time.
+relatime(*) Update atime if the previous atime is older than
+ mtime or ctime
+strictatime Always update atime, but the minimum update interval
+ is specified by atime_quantum.
+atime_quantum=60(*) OCFS2 will not update atime unless this number
+ of seconds has passed since the last update.
+ Set to zero to always update atime. This option need
+ work with strictatime.
+data=ordered (*) All data are forced directly out to the main file
+ system prior to its metadata being committed to the
+ journal.
+data=writeback Data ordering is not preserved, data may be written
+ into the main file system after its metadata has been
+ committed to the journal.
+preferred_slot=0(*) During mount, try to use this filesystem slot first. If
+ it is in use by another node, the first empty one found
+ will be chosen. Invalid values will be ignored.
+commit=nrsec (*) Ocfs2 can be told to sync all its data and metadata
+ every 'nrsec' seconds. The default value is 5 seconds.
+ This means that if you lose your power, you will lose
+ as much as the latest 5 seconds of work (your
+ filesystem will not be damaged though, thanks to the
+ journaling). This default value (or any low value)
+ will hurt performance, but it's good for data-safety.
+ Setting it to 0 will have the same effect as leaving
+ it at the default (5 seconds).
+ Setting it to very large values will improve
+ performance.
+localalloc=8(*) Allows custom localalloc size in MB. If the value is too
+ large, the fs will silently revert it to the default.
+localflocks This disables cluster aware flock.
+inode64 Indicates that Ocfs2 is allowed to create inodes at
+ any location in the filesystem, including those which
+ will result in inode numbers occupying more than 32
+ bits of significance.
+user_xattr (*) Enables Extended User Attributes.
+nouser_xattr Disables Extended User Attributes.
+acl Enables POSIX Access Control Lists support.
+noacl (*) Disables POSIX Access Control Lists support.
+resv_level=2 (*) Set how aggressive allocation reservations will be.
+ Valid values are between 0 (reservations off) to 8
+ (maximum space for reservations).
+dir_resv_level= (*) By default, directory reservations will scale with file
+ reservations - users should rarely need to change this
+ value. If allocation reservations are turned off, this
+ option will have no effect.
+coherency=full (*) Disallow concurrent O_DIRECT writes, cluster inode
+ lock will be taken to force other nodes drop cache,
+ therefore full cluster coherency is guaranteed even
+ for O_DIRECT writes.
+coherency=buffered Allow concurrent O_DIRECT writes without EX lock among
+ nodes, which gains high performance at risk of getting
+ stale data on other nodes.
+journal_async_commit Commit block can be written to disk without waiting
+ for descriptor blocks. If enabled older kernels cannot
+ mount the device. This will enable 'journal_checksum'
+ internally.