posix: option to handle the shared bricks for statvfs()

Currently 'storage/posix' xlator has an option called option
`export-statfs-size no`, which exports zero as values for few
fields in `struct statvfs`. In a case of backend brick shared
between multiple brick processes, the values of these variables
should be `field_value / number-of-bricks-at-node`. This way,
even the issue of 'min-free-disk' etc at different layers would
also be handled properly when the statfs() sys call is made.

Fixes #241

Change-Id: I2e320e1fdcc819ab9173277ef3498201432c275f
Signed-off-by: Amar Tumballi <amarts@redhat.com>
Reviewed-on: https://review.gluster.org/17618
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Jeff Darcy <jeff@pl.atyp.us>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.c b/xlators/mgmt/glusterd/src/glusterd-volgen.c
index 0a0668e9ea6..1ada7232f3e 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.c
@@ -1440,6 +1440,7 @@ static int
 brick_graph_add_posix (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
                         dict_t *set_dict, glusterd_brickinfo_t *brickinfo)
 {
+        char            tmpstr[10] = {0,};
         int             ret = -1;
         gf_boolean_t    quota_enabled   = _gf_true;
         gf_boolean_t    trash_enabled   = _gf_false;
@@ -1491,6 +1492,9 @@ brick_graph_add_posix (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
         if (quota_enabled || pgfid_feat || trash_enabled)
                 xlator_set_option (xl, "update-link-count-parent",
                                    "on");
+
+        snprintf (tmpstr, sizeof (tmpstr), "%d", brickinfo->fs_share_count);
+        ret = xlator_set_option (xl, "shared-brick-count", tmpstr);
 out:
         return ret;
 }