quotad prints many logs as,

[glusterfs3.h:752:dict_to_xdr] 0-dict: key 'trusted.glusterfs.quota.size' is not sent on wire [Invalid argument]
[glusterfs3.h:752:dict_to_xdr] 0-dict: key 'volume-uuid' is not sent on wire [Invalid argument]

For quota, there is a deamon named quotad which has a rpcsvc_program
quotad_aggregator_prog that only supports v3 right now.

Quotad has two actors (LOOKUP,GETLIMIT) that contains a dict in request,
quotad just decodes the dict by dict_unserialize, those dict dates's type
is GF_DATA_TYPE_STR_OLD, which type is not supported at glusterfs v4.

Change-Id: Ib649d7a2e3c68c32dc26bc0f88923a0ba967ebd7
Updates: bz#1596787
Signed-off-by: Kinglong Mee <mijinlong@open-fs.com>

1. cli_req.dict.dict_val,
   It must be freed no metter operation error or success.
   Fix it as lookup "alloca" memory before decode.

2. args.xdata.xdata_val,
   It is allocated by "alloca", free is unneeded.

3. qd_nameless_lookup,
   It olny needs gfid, a gfs3_lookup_req argument is unneeded.

Change-Id: I746dddf7f3d1465b1885af2644afe0bcf0a5665b
fixes: bz#1656682
Signed-off-by: Kinglong Mee <mijinlong@open-fs.com>

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 <srangana@redhat.com>

Change-Id: I6f5d8140a06f3c1b2d196849299f8d483028d33b

* 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        <rabhat@redhat.com>
Varun Shastry           <vshastry@redhat.com>
Shishir Gowda           <sgowda@redhat.com>
Kruthika Dhananjay      <kdhananj@redhat.com>
Brian Foster            <bfoster@redhat.com>
Krishnan Parthasarathi  <kparthas@redhat.com>

Change-Id: Id1cb25b414951da34c665a55f77385d482e0f9de
BUG: 969461
Signed-off-by: Raghavendra G <rgowdapp@redhat.com>
Reviewed-on: http://review.gluster.org/5952
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>