cluster/afr : enable inspection & resolution of files in split-brain

Part 2/2 patch to enable users analyze and resolve
split-brain.

This patch enables :
1) Users to inspect the files in data and metadata split-brain.
2) Resolve the split-brain.
Both using a series of setfattr commands.

Consider a volume "test" with 2 bricks.

1) To inspect a file f1:
setfattr -n replica.split-brain-choice -v test-client-0 f1
        After the execution of this command, if no read_subvol
is found, reads will be served from test-client-0 (corresponding
to brick-0).

2) To resolve split-brain :
setfattr -n replica.split-brain-heal-finalize -v test-client-0 f1
        Execution of this command will lead to the resolution
of data and metadata split-brain with subvol mentioned in the
command (test-client-0 here) as the source and the rest as sink.

Change-Id: Ia20f3ee5abd3119e3d54fcc599f1e55ac65fd179
BUG: 1191396
Signed-off-by: Anuradha <atalur@redhat.com>
Reviewed-on: http://review.gluster.org/9743
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>

1 files changed, 2 insertions, 16 deletions

diff --git a/xlators/cluster/afr/src/afr-self-heal-common.c b/xlators/cluster/afr/src/afr-self-heal-common.c
index 2441f413f3e..21b4c4414d9 100644
--- a/xlators/cluster/afr/src/afr-self-heal-common.c
+++ b/xlators/cluster/afr/src/afr-self-heal-common.c
@@ -389,9 +389,11 @@ afr_mark_split_brain_source_sinks (call_frame_t *frame, xlator_t *this,
         local = frame->local;
         priv = this->private;
         xdata_req = local->xdata_req;
+
         ret = dict_get_int32 (xdata_req, "heal-op", &heal_op);
         if (ret)
                 goto out;
+
         for (i = 0; i < priv->child_count; i++) {
                 if (locked_on[i])
                         if (sources[i] || !sinks[i] || !healed_sinks[i]) {
@@ -468,22 +470,6 @@ out:
 
 }
 
-int
-afr_get_child_index_from_name (xlator_t *this, char *name)
-{
-        afr_private_t *priv  = this->private;
-        int            index = -1;
-
-        for (index = 0; index < priv->child_count; index++) {
-                if (!strcmp (priv->children[index]->name, name))
-                        goto out;
-        }
-        index = -1;
-out:
-        return index;
-}
-
-
 gf_boolean_t
 afr_does_witness_exist (xlator_t *this, uint64_t *witness)
 {