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authorRavishankar N <ravishankar@redhat.com>2015-03-19 12:33:51 +0000
committerVijay Bellur <vbellur@redhat.com>2015-03-19 10:45:49 -0700
commit32ed7aa5ad7049a9d85c795f997336c0366151a8 (patch)
treedd5c31dea878b803f3164b4417ac6b72ded3bbbc /xlators/mgmt/glusterd
parent61489c1725f048c2e34a08e73f0ab367bbf673c1 (diff)
afr: arbiter xlator
This patch adds the arbiter translator into the tree. This is a server side xlator used for replica 3 volumes. It sits above posix and will be loaded on the 3rd (last) brick of every afr subvolume in a replica 3 configuration. It intercepts inode read/write operations: reads are unwound with ENOTCONN, inode writes are unwound with success without actually passing them down to posix. Metadata operations are allowed to pass through. The CLI for creating a 3 way replica with arbiter is also added but kept disabled (A 'normal' 3 way replica is created instead). This patch is a part of the arbiter logic implementation for 3 way AFR, details of which can be found at http://review.gluster.org/#/c/9656/ Change-Id: I395b81f49d5da52c466daf5c8518f1bbad9c16fa BUG: 1199985 Signed-off-by: Ravishankar N <ravishankar@redhat.com> Reviewed-on: http://review.gluster.org/9840 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Diffstat (limited to 'xlators/mgmt/glusterd')
-rw-r--r--xlators/mgmt/glusterd/src/glusterd-volgen.c20
-rw-r--r--xlators/mgmt/glusterd/src/glusterd.h1
2 files changed, 21 insertions, 0 deletions
diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.c b/xlators/mgmt/glusterd/src/glusterd-volgen.c
index 79da432bafe..6f6d1095edb 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.c
@@ -1496,6 +1496,25 @@ out:
}
static int
+brick_graph_add_arbiter (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
+ dict_t *set_dict, glusterd_brickinfo_t *brickinfo)
+{
+ xlator_t *xl = NULL;
+ int ret = -1;
+
+ if (volinfo->arbiter_count != 1)
+ return 0;
+ /*TODO: Parse brickinfo and add the arbiter xlator only if brick is the
+ * last brick (i.e. 3rd brick) of the replcia pair.*/
+ xl = volgen_graph_add (graph, "features/arbiter", volinfo->volname);
+ if (!xl)
+ goto out;
+ ret = 0;
+out:
+ return ret;
+}
+
+static int
brick_graph_add_bd (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
dict_t *set_dict, glusterd_brickinfo_t *brickinfo)
{
@@ -2140,6 +2159,7 @@ static volgen_brick_xlator_t server_graph_table[] = {
{brick_graph_add_changetimerecorder, "changetimerecorder"},
{brick_graph_add_bd, "bd"},
{brick_graph_add_trash, "trash"},
+ {brick_graph_add_arbiter, "arbiter"},
{brick_graph_add_posix, "posix"},
};
diff --git a/xlators/mgmt/glusterd/src/glusterd.h b/xlators/mgmt/glusterd/src/glusterd.h
index bac1598598b..2dd6348ac7f 100644
--- a/xlators/mgmt/glusterd/src/glusterd.h
+++ b/xlators/mgmt/glusterd/src/glusterd.h
@@ -340,6 +340,7 @@ struct glusterd_volinfo_ {
int sub_count; /* backward compatibility */
int stripe_count;
int replica_count;
+ int arbiter_count;
int disperse_count;
int redundancy_count;
int subvol_count; /* Number of subvolumes in a