kernel/git/stable/linux.git/Documentation/filesystems/ocfs2.txt, branch master

docs: filesystems: convert ocfs2.txt to ReST

2020-03-02T21:04:08+00:00

- Add a SPDX header; - Adjust document title; - Some whitespace fixes and new line breaks; - Mark literal blocks as such; - Add it to filesystems/index.rst. Signed-off-by: Mauro Carvalho Chehab Acked-by: Joseph Qi Link: https://lore.kernel.org/r/e29a8120bf1d847f23fb68e915f10a7d43bed9e3.1581955849.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet

ocfs2: update web page + git tree in documentation

2015-02-28T17:57:50+00:00

We (the Ocfs2 project) recently moved the location of our ocfs2-tools git tree and project web page. The pertinent discussion can be seen here: https://oss.oracle.com/pipermail/ocfs2-devel/2015-February/010579.html The following patch updates the Ocfs2 documentation in MAINTAINERS, ocfs2.txt, and dlmfs.txt. I added our new official web page, changed the location of our tools git tree and removed the link to Joel's ancient kernel git tree - Andrew has handled our patches for a while now. Signed-off-by: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2: add a mount option journal_async_commit on ocfs2 filesystem

2015-02-10T22:30:29+00:00

Add a mount option to support JBD2 feature: JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT. When this feature is opened, journal commit block can be written to disk without waiting for descriptor blocks, which can improve journal commit performance. This option will enable 'journal_checksum' internally. Using the fs_mark benchmark, using journal_async_commit shows a 50% improvement, the files per second go up from 215.2 to 317.5. test script: fs_mark -d /mnt/ocfs2/ -s 10240 -n 1000 default: FSUse% Count Size Files/sec App Overhead 0 1000 10240 215.2 17878 with journal_async_commit option: FSUse% Count Size Files/sec App Overhead 0 1000 10240 317.5 17881 Signed-off-by: Alex Chen Signed-off-by: Weiwei Wang Reviewed-by: Joseph Qi Reviewed-by: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2: clean up mount option about atime in ocfs2.txt

2011-05-24T06:37:12+00:00

As ocfs2 supports relatime and strictatime, we need update the relative document. Atime_quantum need work with strictatime, so only show it in procfs when mount with strictatime. Signed-off-by: Tiger Yang Signed-off-by: Joel Becker

Fix common misspellings

2011-03-31T14:26:23+00:00

Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi

ocfs2: Add a mount option "coherency=*" to handle cluster coherency for O_DIRECT writes.

2010-10-11T21:14:55+00:00

Currently, the default behavior of O_DIRECT writes was allowing concurrent writing among nodes to the same file, with no cluster coherency guaranteed (no EX lock held). This can leave stale data in the cache for buffered reads on other nodes. The new mount option introduce a chance to choose two different behaviors for O_DIRECT writes: * coherency=full, as the default value, will disallow concurrent O_DIRECT writes by taking EX locks. * 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. Signed-off-by: Tristan Ye Signed-off-by: Joel Becker

ocfs2: Add dir_resv_level mount option

2010-05-06T01:18:07+00:00

The default behavior for directory reservations stays the same, but we add a mount option so people can tweak the size of directory reservations according to their workloads. Signed-off-by: Mark Fasheh Signed-off-by: Joel Becker

ocfs2: change default reservation window sizes

2010-05-06T01:18:07+00:00

The default reservation size of 4 (32-bit windows) is a bit too ambitious. Scale it back to 16 bits (resv_level=2). I have been testing various sizes on a 4-node cluster which runs a mixed workload that is heavily threaded. With a 256MB local alloc, I get *roughly* the following levels of average file fragmentation: resv_level=0 70% resv_level=1 21% resv_level=2 23% resv_level=3 24% resv_level=4 60% resv_level=5 did not test resv_level=6 60% resv_level=2 seemed like a good compromise between not letting windows be too small, but not so big that heavier workloads will immediately suffer without tuning. This patch also change the behavior of directory reservations - they now track file reservations. The previous compromise of giving directory windows only 8 bits wound up fragmenting more at some window sizes because file allocations had smaller unused windows to poach from. Signed-off-by: Mark Fasheh Signed-off-by: Joel Becker

ocfs2: allocation reservations

2010-05-06T01:17:30+00:00

This patch improves Ocfs2 allocation policy by allowing an inode to reserve a portion of the local alloc bitmap for itself. The reserved portion (allocation window) is advisory in that other allocation windows might steal it if the local alloc bitmap becomes full. Otherwise, the reservations are honored and guaranteed to be free. When the local alloc window is moved to a different portion of the bitmap, existing reservations are discarded. Reservation windows are represented internally by a red-black tree. Within that tree, each node represents the reservation window of one inode. An LRU of active reservations is also maintained. When new data is written, we allocate it from the inodes window. When all bits in a window are exhausted, we allocate a new one as close to the previous one as possible. Should we not find free space, an existing reservation is pulled off the LRU and cannibalized. Signed-off-by: Mark Fasheh

ocfs2: Refresh documentation

2009-11-13T23:45:01+00:00

Signed-off-by: Sunil Mushran Signed-off-by: Joel Becker