dht/rebalancer: Marking tiering migration fops

This is a follow up patch for http://review.gluster.org/#/c/10080
In the above, the suggested change in
http://review.gluster.org/#/c/10080/7/xlators/cluster/dht/src/dht-rebalance.c
doesnot work. The reason it doesnt work is promotion and demotion are done in
a multithread way. Whenever a promotion or demotion thread is called, the frame
of the old sync_op thread is not carried with it. As a result the frame->root->pid
is not set.

Solution:
When the file is getting migrated, we get a tiering.migration key_value in the
xattr dict, so that we pass  this dic key-value when we do syncop_setxattr()
to do  data migration and set the frame->root->pid GF_CLIENT_PID_TIER_DEFRAG
in dht_setxattr() just before calling dht_start_rebalance_task().

>    http://review.gluster.org/#/c/10266/
>    Change-Id: I86fef2d961b32fdd2c0c69d8512cbe846b393404
>    BUG: 1194753
>    Signed-off-by: Joseph Fernandes <josferna@redhat.com>
>    Reviewed-on: http://review.gluster.org/10266
>    Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>
>    Reviewed-by: Susant Palai <spalai@redhat.com>
>    Reviewed-by: Dan Lambright <dlambrig@redhat.com>
>    Tested-by: Gluster Build System <jenkins@build.gluster.com>

Change-Id: I6ab42b2c7a3c3e21c461d097b7558ee967b62c62
BUG: 1218959
Signed-off-by: Joseph Fernandes <josferna@redhat.com>
Reviewed-on: http://review.gluster.org/10266
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>
Reviewed-by: Susant Palai <spalai@redhat.com>
Reviewed-by: Dan Lambright <dlambrig@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Signed-off-by: Joseph Fernandes <josferna@redhat.com>
Reviewed-on: http://review.gluster.org/10601
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 1 insertions, 6 deletions

diff --git a/xlators/cluster/dht/src/dht-rebalance.c b/xlators/cluster/dht/src/dht-rebalance.c
index 5e9f4d6e1a6..11b63c8ee01 100644
--- a/xlators/cluster/dht/src/dht-rebalance.c
+++ b/xlators/cluster/dht/src/dht-rebalance.c
@@ -2711,12 +2711,7 @@ gf_defrag_start (void *data)
         if (!frame)
                 goto out;
 
-        /* If its a tiering rebalancer mark it seperately so that CTR Xlator
-         * can take appropriate action */
-        if (defrag->cmd == GF_DEFRAG_CMD_START_TIER)
-                frame->root->pid = GF_CLIENT_PID_TIER_DEFRAG;
-        else
-                frame->root->pid = GF_CLIENT_PID_DEFRAG;
+        frame->root->pid = GF_CLIENT_PID_DEFRAG;
 
         defrag->pid = frame->root->pid;