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in both `--help` text and man page
updates: bz#1679998
Change-Id: I9aa9367c6863ac8e2403255280697c9e6be26cf0
Signed-off-by: Amar Tumballi <amarts@redhat.com>
Auto invalidation is necessary when same (meta)data is shared/access
across multiple mounts. However, if (meta)data is not shared, all
relevant I/O goes through the cache of single mount and hence is
coherent with (meta)data on bricks always. So, fuse-auto-invalidation
can be disabled for this case which gives a huge performance boost for
workloads that write data and then immediately read the data they just
wrote.
From glusterfs --help,
<snip>
--auto-invalidation[=BOOL] controls whether fuse-kernel can
auto-invalidate attribute, dentry and page-cache.
Disable this only if same files/directories are
not accessed across two different mounts
concurrently [default: "on"]
</snip>
Details on how disabling auto-invalidation helped to reduce pgbench
init times can be found at [1]. Time taken for pgbench init of scale
8000 was 8340s. That will be an improvement of 86% (59280s vs 8340s)
with auto-invalidations turned off along with other
optimizations. Just disabling auto-invalidation contributed 56%
improvement by reducing the total time taken by 33260s.
[1] https://www.spinics.net/lists/gluster-devel/msg25907.html
Change-Id: I0ed730dba9064bd9c576ad1800170a21e100e1ce
Signed-off-by: Raghavendra Gowdappa <rgowdapp@redhat.com>
updates: bz#1664934
The inode LRU mechanism is moot in fuse xlator (ie. there is no
limit for the LRU list), as fuse inodes are referenced from
kernel context, and thus they can only be dropped on request of
the kernel. This might results in a high number of passive
inodes which are useless for the glusterfs client, causing a
significant memory overhead.
This change tries to remedy this by extending the LRU semantics
and allowing to set a finite limit on the fuse inode LRU.
A brief history of problem:
When gluster's inode table was designed, fuse didn't have any
'invalidate' method, which means, userspace application could
never ask kernel to send a 'forget()' fop, instead had to wait
for kernel to send it based on kernel's parameters. Inode table
remembers the number of times kernel has cached the inode based
on the 'nlookup' parameter. And 'nlookup' field is not used by
no other entry points (like server-protocol, gfapi etc).
Hence the inode_table of fuse module always has to have lru-limit
as '0', which means no limit. GlusterFS always had to keep all
inodes in memory as kernel would have had a reference to it.
Again, the reason for this is, kernel's glusterfs inode reference
was pointer of 'inode_t' structure in glusterfs. As it is a
pointer, we could never free it (to prevent segfault, or memory
corruption).
Solution:
In the inode table, handle the prune case of inodes with 'nlookup'
differently, and call a 'invalidator' method, which in this case is
fuse_invalidate(), and it sends the request to kernel for getting
the forget request.
When the kernel sends the forget, it means, it has dropped all
the reference to the inode, and it will send the forget with the
'nlookup' parameter too. We just need to make sure to reduce the
'nlookup' value we have when we get forget. That automatically
cause the relevant prune to happen.
Credits: Csaba Henk, Xavier Hernandez, Raghavendra Gowdappa, Nithya B
fixes: bz#1560969
Change-Id: Ifee0737b23b12b1426c224ec5b8f591f487d83a2
Signed-off-by: Amar Tumballi <amarts@redhat.com>
- Added kernel-writeback-cache command line and xlator
option for requesting utilisation of the writeback
cache of the kernel in FUSE_INIT (see [1]).
- Added attr-times-granularity command line and xlator
option via which granularity of the {a,m,c}time in
stat (attr) data that we support can be indicated to
kernel. This is a means to avoid divergence of the
attr times between kernel and userspace that could
occur with writeback-cache, while still maintaining
maximum time precision the FUSE server is capable of
(see [2]).
- Handling FATTR_CTIME flag in FUSE_SETATTR that
indicates presence of ctime in setattr payload.
Currently we cannot associate arbitrary ctimes to
files on backend, so we just touch them to update
their ctimes to current time. Having ctimes in setattr
payload is also a side effect of writeback cache
(see [3] and [4]).
[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4d99ff8,
"fuse: Turn writeback cache on"
[2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e27c9d3,
"fuse: fuse: add time_gran to INIT_OUT"
[3]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1e18bda,
"fuse: add .write_inode"
[4]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ab9e13f,
"fuse: allow ctime flushing to userspace"
Updates: #435
Change-Id: Id174c8e0c815c4456c35f8c53e41a6a507d91855
Signed-off-by: Csaba Henk <csaba@redhat.com>
So far the --direct-io-mode option has been presented
as of being Boolean valued. That is however not exact,
as a third behavior is chosen if the option is not
specified.
We accept now the "auto" value as an explicit choice
for the default heuristics, and indicate in the
descriptions of the option (which occur in commandline
help and in the gluterfs / mount.glusterfs man pages)
that auto is the default.
The default heuristics was briefly described in the
commandline help. We are getting rid of that, because:
- it's not the right place to provide such details;
- there is no guarantee of keeping the current heuristics
so it might go out of sync with reality;
- that is already the case to some degree, because the
description did not take into account that the default
heuristics varies between platforms (on Mac, it's just
"off"), and that xlators can also prescribe direct I/O
for the file of their choice (see change
I3fe3312cd96baa4eecfe1247ab7255b4f455f049).
Change-Id: Ia83479c0c67fe66b7fc2e0e8db5b7792d9f44b28
Signed-off-by: Csaba Henk <csaba@redhat.com>
Changes:
1. Take subdir mount option in client (mount.gluster / glusterfsd)
2. Pass the subdir mount to server-handshake (from client-handshake)
3. Handle subdir-mount dir's lookup in server-first-lookup and handle
all fops resolution accordingly with proper gfid of subdir
4. Change the auth/addr module to handle the multiple subdir entries
in option, and valid parsing.
How to use the feature:
`# mount -t glusterfs $hostname:/$volname/$subdir /$mount_point`
Or
`# mount -t glusterfs $hostname:/$volname -osubdir_mount=$subdir /$mount_point`
Option can be set like:
`# gluster volume set <volname> auth.allow "/subdir1(192.168.1.*),/(192.168.10.*),/subdir2(192.168.8.*)"`
Updates #175
Change-Id: I7ea57f76ddbe6c3862cfe02e13f89e8a39719e11
Signed-off-by: Amar Tumballi <amarts@redhat.com>
Reviewed-on: https://review.gluster.org/17141
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Also missing bang (!) in #!/bin/bash in shell scripts.
Change-Id: I567a4be8f0f31f6285550f243fe802895f6bc43b
BUG: 1336793
Reported-by: Patrick Matthäi <pmatthaei@debian.org>
Signed-off-by: Kaleb S KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/14398
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Smoke: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kotresh HR <khiremat@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Gluster doesn't SELinux mount option, so it is removed.
Change-Id: I471ad98a24b5f5d64279c805b3243cb1168dd3d1
BUG: 1274626
Signed-off-by: hari gowtham <hgowtham@redhat.com>
Reviewed-on: http://review.gluster.org/12422
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
This patch is an attempt to provide some much needed
cleanup for future maintenance of `mount.glusterfs`
- Add checks for command failures
- Spliting large code into subsequent simpler functions
- Standardized variables
- use 'bash' instead of 'sh' - since string manipulation
and variable handling is far superior
- Overall code cleanup and Copyright change to Red, Hat Inc.
- Add new style of mounting with a comma separated list
~~~
$ mount -t glusterfs <IP1/HOSTNAME1>,<IP2/HOSTNAME2>,..<IPN/HOSTNAMEN>:/<VOLUME> <MNT>
~~~
- Update age old `manpage` with new options :-)
Change-Id: I294e4d078a067d67d9a67eb8dde5eb2634cc0e45
BUG: 1040348
Signed-off-by: Harshavardhana <harsha@harshavardhana.net>
Reviewed-on: http://review.gluster.org/5931
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@gmail.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
The license message is changed to
Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
Change-Id: I07d2b63ed5fbbbd1884f1e74f2dd56013d15b0f4
BUG: 852318
Signed-off-by: Varun Shastry <vshastry@redhat.com>
Reviewed-on: http://review.gluster.org/3858
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
man 8 glusterfs
man 8 mount.glusterfs
man 8 glusterfs-volgen
Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>
BUG: 734 (keep only the working/usable code in build tree to focus more on development)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=734
