glusterd: Implement persistent store for quota

Setting quota limits on a given directory will cause glusterd to
persist the gfid of the path in WD/vols/<volname>/quota.conf.

Also, executing 'quota remove' will cause glusterd to remove
the gfid of the given path.

This is needed for implementing the 'list-all' variant of 'quota list'
command.

To-Do:

1. Exchange quota.conf when a new node is added into the cluster;
2. Unlink quota.conf on disabling quota (?)

Change-Id: I7d75a9cdb43e4e1389ddb08ffe09b294d36f87d8
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-store.c b/xlators/mgmt/glusterd/src/glusterd-store.c
index 71c8428e..b9f4792d 100644
--- a/xlators/mgmt/glusterd/src/glusterd-store.c
+++ b/xlators/mgmt/glusterd/src/glusterd-store.c
@@ -683,6 +683,21 @@ glusterd_store_node_state_path_set (glusterd_volinfo_t *volinfo,
                   GLUSTERD_NODE_STATE_FILE);
 }
 
+static void
+glusterd_store_quota_conf_path_set (glusterd_volinfo_t *volinfo,
+                                    char *quota_conf_path, size_t len)
+{
+        char    voldirpath[PATH_MAX] = {0,};
+        GF_ASSERT (volinfo);
+        GF_ASSERT (quota_conf_path);
+        GF_ASSERT (len <= PATH_MAX);
+
+        glusterd_store_voldirpath_set (volinfo, voldirpath,
+                                       sizeof (voldirpath));
+        snprintf (quota_conf_path, len, "%s/%s", voldirpath,
+                  GLUSTERD_VOLUME_QUOTA_CONFIG);
+}
+
 int32_t
 glusterd_store_create_rbstate_shandle_on_absence (glusterd_volinfo_t *volinfo)
 {
@@ -728,6 +743,22 @@ glusterd_store_create_nodestate_sh_on_absence (glusterd_volinfo_t *volinfo)
 }
 
 int32_t
+glusterd_store_create_quota_conf_sh_on_absence (glusterd_volinfo_t *volinfo)
+{
+        char            quota_conf_path[PATH_MAX] = {0};
+        int32_t         ret                       = 0;
+
+        GF_ASSERT (volinfo);
+
+        glusterd_store_quota_conf_path_set (volinfo, quota_conf_path,
+                                            sizeof (quota_conf_path));
+        ret =
+          gf_store_handle_create_on_absence (&volinfo->quota_conf_shandle,
+                                             quota_conf_path);
+
+        return ret;
+}
+int32_t
 glusterd_store_brickinfos (glusterd_volinfo_t *volinfo, int vol_fd)
 {
         int32_t                 ret = 0;