glusterfs.git/xlators/features/quota/src/quotad.c, branch experimental

xlator: make 'xlator_api' mandatory

2018-12-13T09:11:50+00:00

* Remove the options to load old symbol.
* keep only 'xlator_api' symbol from being exported using xlator.sym
* add xlator_api to all the xlators where its missing

NOTE: This covers all the xlators which has at least a test case
to validate its loading. If there is a translator, which doesn't
have any test, then we should probably remove that from codebase.

fixes: #164
Change-Id: Ibcdc8c9844cda6b4463d907a15813745d14c1ebb
Signed-off-by: Amar Tumballi

libglusterfs: Move devel headers under glusterfs directory

2018-12-05T21:47:04+00:00

libglusterfs devel package headers are referenced in code using
include semantics for a program, this while it works can be better
especially when dealing with out of tree xlator builds or in
general out of tree devel package usage.

Towards this, the following changes are done,
- moved all devel headers under a glusterfs directory
- Included these headers using system header notation <> in all
code outside of libglusterfs
- Included these headers using own program notation "" within
libglusterfs

This change although big, is just moving around the headers and
making it correct when including these headers from other sources.

This helps us correctly include libglusterfs includes without
namespace conflicts.

Change-Id: Id2a98854e671a7ee5d73be44da5ba1a74252423b
Updates: bz#1193929
Signed-off-by: ShyamsundarR

Quota related files: use dict_{setn|getn|deln|get_int32n|set_int32n|set_strn}

2018-09-26T04:17:30+00:00

In a previous patch (https://review.gluster.org/20769) we've
added the key length to be passed to dict_* funcs, to remove the need
to strlen() it. This patch moves some code to use it.

Please review carefully.
Compile-tested only!

updates: bz#1193929
Signed-off-by: Yaniv Kaul 

Change-Id: If4f425a9827be7c36ccfbb9761006ae824a818c6

Land part 2 of clang-format changes

2018-09-12T12:22:45+00:00

Change-Id: Ia84cc24c8924e6d22d02ac15f611c10e26db99b4
Signed-off-by: Nigel Babu

quota: fix unused variable warnings/errors

2016-08-27T11:10:34+00:00

http://review.gluster.org/14085 fixes a/the "leak" - via the
generated rpc/xdr headers - of pragmas that mask these warnings.

However 14085 won't pass the smoke test until all the warnings are
fixed.

Change-Id: Ic5c1e20468d47ccb5243b8e99f946fd31eb737b8
BUG: 1369124
Signed-off-by: Kaleb S. KEITHLEY 
Reviewed-on: http://review.gluster.org/15250
CentOS-regression: Gluster Build System 
NetBSD-regression: NetBSD Build System 
Smoke: Gluster Build System 
Reviewed-by: Manikandan Selvaganesh 
Reviewed-by: Raghavendra G

quota: setting 'read-only' option in xdata to instruct DHT to not heal

2016-04-19T07:18:30+00:00

When quota is enabled the quota enforcer tries to get the size of the
source directory by sending nameless lookup to quotad. But if the rename
is successful even on one subvol or the source layout has anomalies then
this nameless lookup in quotad tries to heal the directory which requires
a lock on as many subvols as it can. But src is already locked as part of
rename. For rename to proceed in brick it needs to complete a cluster-wide
lookup. But cluster-wide lookup in quotad is blocked on locks held by rename,
hence a deadlock. To avoid this quota sends an option in xdata which instructs
DHT not to heal.

Change-Id: I792f9322331def0b1f4e16e88deef55d0c9f17f0
BUG: 1252244
Signed-off-by: Sakshi Bansal 
Reviewed-on: http://review.gluster.org/13988
Smoke: Gluster Build System 
NetBSD-regression: NetBSD Build System 
CentOS-regression: Gluster Build System 
Tested-by: Gluster Build System 
Reviewed-by: Raghavendra G

quotad: create sock listener only after graph init is complete

2015-07-09T12:33:37+00:00

If FOPs are received before completing graph initialization,
FOP path can crash while accessing uninitialized variables

This patch fixes issue by not creating listener until
graph initialization is complete and hence not receiving
FOP request

Change-Id: I4771e376410843dff44bfe819329a4632523d266
BUG: 1240254
Signed-off-by: vmallika 
Reviewed-on: http://review.gluster.org/11552
Tested-by: NetBSD Build System 
Tested-by: Gluster Build System 
Reviewed-by: Raghavendra G

features/quota: Improvements to quota

2013-11-26T18:24:02+00:00

* Two stages of quota enforcement is done:

  Soft and hard quota Upon reaching soft quota limit on the directory
  it logs/alerts in the quota daemon log (ie DEFAULT_LOG_DIR/quotad.log)
  and no more writes allowed after hard
  quota limit. After reaching the soft-limit the daemon alerts the
  user/admin repeatively for every 'alert-time', which is
  configurable.

* Quota enforcer is moved to server-side.

  It  takes care of enforcing quota. Since enforcer doesn't have the
  cluster view, it relies on another service called
  quota-aggregator. Aggregator, on query can return the size of a
  directory based on the cluster view.

  Enforcer is always loaded in the server graph and is by passed if
  the feature is not enabled.

  Options specific to enforcer:

  server-quota - Specifies whether the feature is on/off. It is used
  to by pass the quota if turned off.

  deem-statfs - If set to on, it takes quota limits into consideration
  while estimating fs size. (df command). The algorithm followed is,
  i.   Adjust statvfs based on limit configured on root.
  ii.  If limit is set on the inode passed, use size/limits on that inode to
       populate statvfs. Otherwise, use size/limits configured on root.
  iii. Upon statvfs, update the ctx->size on the inode.
  iv.  Don't let DHT aggregate, instead take the maximum of the usages from the
       subvols of the DHT, since each of it contains the complete information.

  Enforcer also makes use of gfid-to-path conversion functionality to
  work correctly when a client like nfs predominently relies on
  nameless lookups.

* Quota Aggregator acts as a thin client to provide cluster view

  Its a lightweight *gluster client* process with no mount point,
  started upon enabling quota or restarting the volume. This is a
  single process run on each brick, which can answer queries on all
  volumes in the cluster. Its volfile stored in
  GLUSTERD_DEFAULT_WORKING_DIR/quotad/quotad.vol.

Credits:
Raghavendra Bhat        
Varun Shastry           
Shishir Gowda           
Kruthika Dhananjay      
Brian Foster            
Krishnan Parthasarathi  

Change-Id: Id1cb25b414951da34c665a55f77385d482e0f9de
BUG: 969461
Signed-off-by: Raghavendra G 
Reviewed-on: http://review.gluster.org/5952
Tested-by: Gluster Build System 
Reviewed-by: Anand Avati