glusterfs/SOURCES/0502-dht-fixing-a-permission-update-issue.patch

From 3f1eee125a35c33ecb078e5d3bfd80d80e63881d Mon Sep 17 00:00:00 2001
From: Barak Sason Rofman <bsasonro@redhat.com>
Date: Wed, 15 Jan 2020 12:02:05 +0200
Subject: [PATCH 502/511] dht - fixing a permission update issue

When bringing back a downed brick and performing lookup from the client
side, the permission on said brick aren't updated on the first lookup,
but only on the second.

This patch modifies permission update logic so the first lookup will
trigger a permission update on the downed brick.

LIMITATIONS OF THE PATCH:
As the choice of source depends on whether the directory has layout or not.
Even the directories on the newly added brick will have layout xattr[zeroed], but the same is not true for a root directory.
Hence, in case in the entire cluster only the newly added bricks are up [and others are down], then any change in permission during this time will be overwritten by the older permissions when the cluster is restarted.

Upstream:
> Reviewed-on: https://review.gluster.org/#/c/glusterfs/+/24020/
> fixes: #999
> Change-Id: Ieb70246d41e59f9cae9f70bc203627a433dfbd33
> Signed-off-by: Barak Sason Rofman <bsasonro@redhat.com>

BUG: 1663821
Change-Id: Ieb70246d41e59f9cae9f70bc203627a433dfbd33
Signed-off-by: Barak Sason Rofman <bsasonro@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/221116
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
---
 tests/bugs/bug-1064147.t                 | 71 ++++++++++++++++++++++++++++++++
 xlators/cluster/dht/src/dht-common.c     | 28 ++++++++++---
 xlators/cluster/dht/src/dht-selfheal.c   | 15 +++++--
 xlators/storage/posix/src/posix-common.c | 16 +++----
 4 files changed, 111 insertions(+), 19 deletions(-)
 create mode 100755 tests/bugs/bug-1064147.t

diff --git a/tests/bugs/bug-1064147.t b/tests/bugs/bug-1064147.t
new file mode 100755
index 0000000..617a1aa
--- /dev/null
+++ b/tests/bugs/bug-1064147.t
@@ -0,0 +1,71 @@
+#!/bin/bash
+
+. $(dirname $0)/../include.rc
+. $(dirname $0)/../volume.rc
+
+# Initialize
+#------------------------------------------------------------
+cleanup;
+
+# Start glusterd
+TEST glusterd;
+TEST pidof glusterd;
+TEST $CLI volume info;
+
+# Create a volume
+TEST $CLI volume create $V0 $H0:/${V0}{1,2};
+
+# Verify volume creation
+ EXPECT "$V0" volinfo_field $V0 'Volume Name';
+ EXPECT 'Created' volinfo_field $V0 'Status';
+
+# Start volume and verify successful start
+ TEST $CLI volume start $V0;
+ EXPECT 'Started' volinfo_field $V0 'Status';
+ TEST glusterfs -s $H0 --volfile-id=$V0 $M0
+#------------------------------------------------------------
+
+# Test case 1 - Subvolume down + Healing
+#------------------------------------------------------------
+# Kill 2nd brick process
+TEST kill -9  `ps aux | grep glusterfsd | grep ${V0}2 | grep -v grep | awk '{print $2}'`;
+
+# Change root permissions
+TEST chmod 444 $M0
+
+# Store permission for comparision
+TEST permission_new=`stat -c "%A" $M0`
+
+# Bring up the killed brick process
+TEST $CLI volume start $V0 force
+
+# Perform lookup
+sleep 5
+TEST ls $M0
+
+# Check brick permissions
+TEST brick_perm=`stat -c "%A" /${V0}2`
+TEST [ ${brick_perm} = ${permission_new} ]
+#------------------------------------------------------------
+
+# Test case 2 - Add-brick + Healing
+#------------------------------------------------------------
+# Change root permissions
+TEST chmod 777 $M0
+
+# Store permission for comparision
+TEST permission_new_2=`stat -c "%A" $M0`
+
+# Add a 3rd brick
+TEST $CLI volume add-brick $V0 $H0:/${V0}3
+
+# Perform lookup
+sleep 5
+TEST ls $M0
+
+# Check permissions on the new brick
+TEST brick_perm2=`stat -c "%A" /${V0}3`
+
+TEST [ ${brick_perm2} = ${permission_new_2} ]
+
+cleanup;
diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
index 4db89df..fe1d0ee 100644
--- a/xlators/cluster/dht/src/dht-common.c
+++ b/xlators/cluster/dht/src/dht-common.c
@@ -1363,13 +1363,29 @@ dht_lookup_dir_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
             dht_aggregate_xattr(local->xattr, xattr);
         }
 
+        if (__is_root_gfid(stbuf->ia_gfid)) {
+            ret = dht_dir_has_layout(xattr, conf->xattr_name);
+            if (ret >= 0) {
+                if (is_greater_time(local->prebuf.ia_ctime,
+                                    local->prebuf.ia_ctime_nsec,
+                                    stbuf->ia_ctime, stbuf->ia_ctime_nsec)) {
+                    /* Choose source */
+                    local->prebuf.ia_gid = stbuf->ia_gid;
+                    local->prebuf.ia_uid = stbuf->ia_uid;
+
+                    local->prebuf.ia_ctime = stbuf->ia_ctime;
+                    local->prebuf.ia_ctime_nsec = stbuf->ia_ctime_nsec;
+                    local->prebuf.ia_prot = stbuf->ia_prot;
+                }
+            }
+        }
+
         if (local->stbuf.ia_type != IA_INVAL) {
             /* This is not the first subvol to respond */
-            if (!__is_root_gfid(stbuf->ia_gfid) &&
-                ((local->stbuf.ia_gid != stbuf->ia_gid) ||
-                 (local->stbuf.ia_uid != stbuf->ia_uid) ||
-                 (is_permission_different(&local->stbuf.ia_prot,
-                                          &stbuf->ia_prot)))) {
+            if ((local->stbuf.ia_gid != stbuf->ia_gid) ||
+                (local->stbuf.ia_uid != stbuf->ia_uid) ||
+                (is_permission_different(&local->stbuf.ia_prot,
+                                         &stbuf->ia_prot))) {
                 local->need_attrheal = 1;
             }
         }
@@ -10969,7 +10985,7 @@ dht_notify(xlator_t *this, int event, void *data, ...)
                 if ((cmd == GF_DEFRAG_CMD_STATUS) ||
                     (cmd == GF_DEFRAG_CMD_STATUS_TIER) ||
                     (cmd == GF_DEFRAG_CMD_DETACH_STATUS))
-                	gf_defrag_status_get(conf, output, _gf_false);
+                    gf_defrag_status_get(conf, output, _gf_false);
                 else if (cmd == GF_DEFRAG_CMD_START_DETACH_TIER)
                     gf_defrag_start_detach_tier(defrag);
                 else if (cmd == GF_DEFRAG_CMD_DETACH_START)
diff --git a/xlators/cluster/dht/src/dht-selfheal.c b/xlators/cluster/dht/src/dht-selfheal.c
index f5dfff9..f4e17d1 100644
--- a/xlators/cluster/dht/src/dht-selfheal.c
+++ b/xlators/cluster/dht/src/dht-selfheal.c
@@ -2097,9 +2097,18 @@ dht_selfheal_directory(call_frame_t *frame, dht_selfheal_dir_cbk_t dir_cbk,
     local->selfheal.dir_cbk = dir_cbk;
     local->selfheal.layout = dht_layout_ref(this, layout);
 
-    if (local->need_attrheal && !IA_ISINVAL(local->mds_stbuf.ia_type)) {
-        /*Use the one in the mds_stbuf*/
-        local->stbuf = local->mds_stbuf;
+    if (local->need_attrheal) {
+        if (__is_root_gfid(local->stbuf.ia_gfid)) {
+            local->stbuf.ia_gid = local->prebuf.ia_gid;
+            local->stbuf.ia_uid = local->prebuf.ia_uid;
+
+            local->stbuf.ia_ctime = local->prebuf.ia_ctime;
+            local->stbuf.ia_ctime_nsec = local->prebuf.ia_ctime_nsec;
+            local->stbuf.ia_prot = local->prebuf.ia_prot;
+
+        } else if (!IA_ISINVAL(local->mds_stbuf.ia_type)) {
+            local->stbuf = local->mds_stbuf;
+        }
     }
 
     if (!__is_root_gfid(local->stbuf.ia_gfid)) {
diff --git a/xlators/storage/posix/src/posix-common.c b/xlators/storage/posix/src/posix-common.c
index c5a43a1..e5c6e62 100644
--- a/xlators/storage/posix/src/posix-common.c
+++ b/xlators/storage/posix/src/posix-common.c
@@ -598,6 +598,7 @@ posix_init(xlator_t *this)
     int force_directory = -1;
     int create_mask = -1;
     int create_directory_mask = -1;
+    char value;
 
     dir_data = dict_get(this->options, "directory");
 
@@ -654,16 +655,11 @@ posix_init(xlator_t *this)
     }
 
     /* Check for Extended attribute support, if not present, log it */
-    op_ret = sys_lsetxattr(dir_data->data, "trusted.glusterfs.test", "working",
-                           8, 0);
-    if (op_ret != -1) {
-        ret = sys_lremovexattr(dir_data->data, "trusted.glusterfs.test");
-        if (ret) {
-            gf_msg(this->name, GF_LOG_DEBUG, errno, P_MSG_INVALID_OPTION,
-                   "failed to remove xattr: "
-                   "trusted.glusterfs.test");
-        }
-    } else {
+    size = sys_lgetxattr(dir_data->data, "user.x", &value, sizeof(value));
+
+    if ((size == -1) && (errno == EOPNOTSUPP)) {
+        gf_msg(this->name, GF_LOG_DEBUG, 0, P_MSG_XDATA_GETXATTR,
+               "getxattr returned %zd", size);
         tmp_data = dict_get(this->options, "mandate-attribute");
         if (tmp_data) {
             if (gf_string2boolean(tmp_data->data, &tmp_bool) == -1) {
-- 
1.8.3.1