glusterfs/SOURCES/0478-DHT-Fixing-rebalance-failure-on-issuing-stop-command.patch

From e772bef5631017145cd0270d72a9ada1378e022a Mon Sep 17 00:00:00 2001
From: Barak Sason Rofman <bsasonro@redhat.com>
Date: Fri, 30 Oct 2020 08:27:47 +0200
Subject: [PATCH 478/478] DHT - Fixing rebalance failure on issuing stop
 command

Issuing a stop command for an ongoing rebalance process results in an error.
This issue was brought up in https://bugzilla.redhat.com/1286171 and a patch
(https://review.gluster.org/24103/) was submitted to resolve the issue.

However the submitted patch resolved only part of the
problem by reducing the number of log messages that were printed (since
rebalnace is currently a recursive process, an error message was printed
for every directory) but didn't fully resolve the root cause for the
failure.

This patch fixes the issue by modifying the code-path which handles the
termination of the rebalance process by issuing a stop command.

Upstream:
> Reviewed-on: https://github.com/gluster/glusterfs/pull/1628
> fixes: #1627
> Change-Id: I604f2b0f8b1ccb1026b8425a14200bbd1dc5bd03
> Signed-off-by: Barak Sason Rofman bsasonro@redhat.com

BUG: 1286171
Change-Id: I604f2b0f8b1ccb1026b8425a14200bbd1dc5bd03
Signed-off-by: Barak Sason Rofman <bsasonro@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/216896
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
---
 xlators/cluster/dht/src/dht-rebalance.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/xlators/cluster/dht/src/dht-rebalance.c b/xlators/cluster/dht/src/dht-rebalance.c
index abc10fc..d49a719 100644
--- a/xlators/cluster/dht/src/dht-rebalance.c
+++ b/xlators/cluster/dht/src/dht-rebalance.c
@@ -3113,12 +3113,10 @@ int static gf_defrag_get_entry(xlator_t *this, int i,
     struct dht_container *tmp_container = NULL;
 
     if (defrag->defrag_status != GF_DEFRAG_STATUS_STARTED) {
-        ret = -1;
         goto out;
     }
 
     if (dir_dfmeta->offset_var[i].readdir_done == 1) {
-        ret = 0;
         goto out;
     }
 
@@ -3135,7 +3133,6 @@ int static gf_defrag_get_entry(xlator_t *this, int i,
                               &(dir_dfmeta->equeue[i]), xattr_req, NULL);
         if (ret == 0) {
             dir_dfmeta->offset_var[i].readdir_done = 1;
-            ret = 0;
             goto out;
         }
 
@@ -3161,7 +3158,6 @@ int static gf_defrag_get_entry(xlator_t *this, int i,
 
     while (1) {
         if (defrag->defrag_status != GF_DEFRAG_STATUS_STARTED) {
-            ret = -1;
             goto out;
         }
 
@@ -3273,12 +3269,14 @@ int static gf_defrag_get_entry(xlator_t *this, int i,
     }
 
 out:
-    if (ret == 0) {
-        *container = tmp_container;
-    } else {
-        if (tmp_container) {
+    if (defrag->defrag_status == GF_DEFRAG_STATUS_STARTED) {
+        if (ret == 0) {
+            *container = tmp_container;
+        } else {
             gf_defrag_free_container(tmp_container);
         }
+    } else {
+        gf_defrag_free_container(tmp_container);
     }
 
     return ret;
@@ -3487,7 +3485,7 @@ gf_defrag_process_dir(xlator_t *this, gf_defrag_info_t *defrag, loc_t *loc,
                                       migrate_data, dir_dfmeta, xattr_req,
                                       &should_commit_hash, perrno);
 
-            if (defrag->defrag_status == GF_DEFRAG_STATUS_STOPPED) {
+            if (defrag->defrag_status != GF_DEFRAG_STATUS_STARTED) {
                 goto out;
             }
 
@@ -3947,7 +3945,7 @@ gf_defrag_fix_layout(xlator_t *this, gf_defrag_info_t *defrag, loc_t *loc,
             ret = gf_defrag_fix_layout(this, defrag, &entry_loc, fix_layout,
                                        migrate_data);
 
-            if (defrag->defrag_status == GF_DEFRAG_STATUS_STOPPED) {
+            if (defrag->defrag_status != GF_DEFRAG_STATUS_STARTED) {
                 goto out;
             }
 
@@ -4015,6 +4013,10 @@ gf_defrag_fix_layout(xlator_t *this, gf_defrag_info_t *defrag, loc_t *loc,
         (defrag->cmd != GF_DEFRAG_CMD_START_LAYOUT_FIX)) {
         ret = gf_defrag_process_dir(this, defrag, loc, migrate_data, &perrno);
 
+        if (defrag->defrag_status != GF_DEFRAG_STATUS_STARTED) {
+            goto out;
+        }
+
         if (ret && (ret != 2)) {
             if (perrno == ENOENT || perrno == ESTALE) {
                 ret = 0;
-- 
1.8.3.1