cluster/afr: Fix incorrect reporting of gfid & type mismatch

Problems:
1. When checking for type and gfid mismatch, if the type or gfid
is unknown because of missing gfid handle and the gfid xattr
it will be reported as type or gfid mismatch and the heal will
not complete.

2. If the source selected during entry heal has null gfid the same
will be sent to afr_lookup_and_heal_gfid(). In this function when
we try to assign the gfid on the bricks where it does not exist,
we are considering the same gfid and try to assign that on those
bricks. This will fail in posix_gfid_set() since the gfid sent
is null.

Fix:
If the gfid sent to afr_lookup_and_heal_gfid() is null choose a
valid gfid before proceeding to assign the gfid on the bricks
where it is missing.

In afr_selfheal_detect_gfid_and_type_mismatch(), do not report
type/gfid mismatch if the type/gfid is unknown or not set.

Change-Id: Ia06552e4dc4a9f89cb7f5302833604bd21bbf7da
fixes: bz#1729481
Signed-off-by: karthik-us <ksubrahm@redhat.com>

3 files changed, 139 insertions, 2 deletions

diff --git a/tests/bugs/replicate/bug-1722507-type-mismatch-error-handling.t b/tests/bugs/replicate/bug-1722507-type-mismatch-error-handling.t
new file mode 100644
index 00000000000..0aeaaafc84c
--- /dev/null
+++ b/tests/bugs/replicate/bug-1722507-type-mismatch-error-handling.t
@@ -0,0 +1,116 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+. $(dirname $0)/../../afr.rc
+
+cleanup;
+
+## Start and create a volume
+TEST glusterd;
+TEST pidof glusterd;
+TEST $CLI volume info;
+
+TEST $CLI volume create $V0 replica 3 $H0:$B0/${V0}{0,1,2};
+TEST $CLI volume start $V0;
+TEST $CLI volume set $V0 cluster.heal-timeout 5
+TEST $CLI volume heal $V0 disable
+EXPECT 'Started' volinfo_field $V0 'Status';
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0
+
+TEST mkdir $M0/dir
+
+##########################################################################################
+# GFID link file and the GFID is missing on one brick and all the bricks are being blamed.
+
+TEST touch $M0/dir/file
+#TEST kill_brick $V0 $H0 $B0/$V0"1"
+
+#B0 and B2 must blame B1
+setfattr -n trusted.afr.$V0-client-0 -v 0x000000000000000000000001 $B0/$V0"2"/dir
+setfattr -n trusted.afr.$V0-client-1 -v 0x000000000000000000000001 $B0/$V0"0"/dir
+setfattr -n trusted.afr.$V0-client-2 -v 0x000000000000000000000001 $B0/$V0"0"/dir
+
+# Add entry to xattrop dir to trigger index heal.
+xattrop_dir0=$(afr_get_index_path $B0/$V0"0")
+base_entry_b0=`ls $xattrop_dir0`
+gfid_str=$(gf_gfid_xattr_to_str $(gf_get_gfid_xattr $B0/$V0"0"/dir/))
+ln -s $xattrop_dir0/$base_entry_b0 $xattrop_dir0/$gfid_str
+EXPECT "^1$" get_pending_heal_count $V0
+
+# Remove the gfid xattr and the link file on one brick.
+gfid_file=$(gf_get_gfid_xattr $B0/$V0"0"/dir/file)
+gfid_str_file=$(gf_gfid_xattr_to_str $gfid_file)
+TEST setfattr -x trusted.gfid $B0/${V0}0/dir/file
+TEST rm -f $B0/${V0}0/.glusterfs/${gfid_str_file:0:2}/${gfid_str_file:2:2}/$gfid_str_file
+
+# Launch heal
+TEST $CLI volume heal $V0 enable
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "^Y$" glustershd_up_status
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 1
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 2
+
+# Wait for 2 second to force posix to consider that this is a valid file but
+# without gfid.
+sleep 2
+TEST $CLI volume heal $V0
+
+# Heal should not fail as the file is missing gfid xattr and the link file,
+# which is not actually the gfid or type mismatch.
+EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
+
+EXPECT "$gfid_file" gf_get_gfid_xattr $B0/${V0}0/dir/file
+TEST stat $B0/${V0}0/.glusterfs/${gfid_str_file:0:2}/${gfid_str_file:2:2}/$gfid_str_file
+rm -f $M0/dir/file
+
+
+###########################################################################################
+# GFID link file and the GFID is missing on two bricks and all the bricks are being blamed.
+
+TEST $CLI volume heal $V0 disable
+TEST touch $M0/dir/file
+#TEST kill_brick $V0 $H0 $B0/$V0"1"
+
+#B0 and B2 must blame B1
+setfattr -n trusted.afr.$V0-client-0 -v 0x000000000000000000000001 $B0/$V0"2"/dir
+setfattr -n trusted.afr.$V0-client-1 -v 0x000000000000000000000001 $B0/$V0"0"/dir
+setfattr -n trusted.afr.$V0-client-2 -v 0x000000000000000000000001 $B0/$V0"0"/dir
+
+# Add entry to xattrop dir to trigger index heal.
+xattrop_dir0=$(afr_get_index_path $B0/$V0"0")
+base_entry_b0=`ls $xattrop_dir0`
+gfid_str=$(gf_gfid_xattr_to_str $(gf_get_gfid_xattr $B0/$V0"0"/dir/))
+ln -s $xattrop_dir0/$base_entry_b0 $xattrop_dir0/$gfid_str
+EXPECT "^1$" get_pending_heal_count $V0
+
+# Remove the gfid xattr and the link file on two bricks.
+gfid_file=$(gf_get_gfid_xattr $B0/$V0"0"/dir/file)
+gfid_str_file=$(gf_gfid_xattr_to_str $gfid_file)
+TEST setfattr -x trusted.gfid $B0/${V0}0/dir/file
+TEST rm -f $B0/${V0}0/.glusterfs/${gfid_str_file:0:2}/${gfid_str_file:2:2}/$gfid_str_file
+TEST setfattr -x trusted.gfid $B0/${V0}1/dir/file
+TEST rm -f $B0/${V0}1/.glusterfs/${gfid_str_file:0:2}/${gfid_str_file:2:2}/$gfid_str_file
+
+# Launch heal
+TEST $CLI volume heal $V0 enable
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "^Y$" glustershd_up_status
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 1
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 2
+
+# Wait for 2 second to force posix to consider that this is a valid file but
+# without gfid.
+sleep 2
+TEST $CLI volume heal $V0
+
+# Heal should not fail as the file is missing gfid xattr and the link file,
+# which is not actually the gfid or type mismatch.
+EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
+
+EXPECT "$gfid_file" gf_get_gfid_xattr $B0/${V0}0/dir/file
+TEST stat $B0/${V0}0/.glusterfs/${gfid_str_file:0:2}/${gfid_str_file:2:2}/$gfid_str_file
+EXPECT "$gfid_file" gf_get_gfid_xattr $B0/${V0}1/dir/file
+TEST stat $B0/${V0}1/.glusterfs/${gfid_str_file:0:2}/${gfid_str_file:2:2}/$gfid_str_file
+
+cleanup
diff --git a/xlators/cluster/afr/src/afr-self-heal-common.c b/xlators/cluster/afr/src/afr-self-heal-common.c
index 298897526f7..4dc38e14099 100644
--- a/xlators/cluster/afr/src/afr-self-heal-common.c
+++ b/xlators/cluster/afr/src/afr-self-heal-common.c
@@ -55,7 +55,8 @@ afr_lookup_and_heal_gfid(xlator_t *this, inode_t *parent, const char *name,
     for (i = 0; i < priv->child_count; i++) {
         if (source == -1) {
             /* case (a) above. */
-            if (replies[i].valid && replies[i].op_ret == 0) {
+            if (replies[i].valid && replies[i].op_ret == 0 &&
+                replies[i].poststat.ia_type != IA_INVAL) {
                 ia_type = replies[i].poststat.ia_type;
                 break;
             }
@@ -63,7 +64,8 @@ afr_lookup_and_heal_gfid(xlator_t *this, inode_t *parent, const char *name,
             /* case (b) above. */
             if (i == source)
                 continue;
-            if (sources[i] && replies[i].valid && replies[i].op_ret == 0) {
+            if (sources[i] && replies[i].valid && replies[i].op_ret == 0 &&
+                replies[i].poststat.ia_type != IA_INVAL) {
                 ia_type = replies[i].poststat.ia_type;
                 break;
             }
@@ -77,6 +79,12 @@ heal:
     for (i = 0; i < priv->child_count; i++) {
         if (!replies[i].valid || replies[i].op_ret != 0)
             continue;
+
+        if (gf_uuid_is_null(gfid) &&
+            !gf_uuid_is_null(replies[i].poststat.ia_gfid) &&
+            replies[i].poststat.ia_type == ia_type)
+            gfid = replies[i].poststat.ia_gfid;
+
         if (!gf_uuid_is_null(replies[i].poststat.ia_gfid) ||
             replies[i].poststat.ia_type != ia_type)
             continue;
diff --git a/xlators/cluster/afr/src/afr-self-heal-entry.c b/xlators/cluster/afr/src/afr-self-heal-entry.c
index a6890fad9de..e07b521e0eb 100644
--- a/xlators/cluster/afr/src/afr-self-heal-entry.c
+++ b/xlators/cluster/afr/src/afr-self-heal-entry.c
@@ -246,6 +246,19 @@ afr_selfheal_detect_gfid_and_type_mismatch(xlator_t *this,
         if (replies[i].op_ret != 0)
             continue;
 
+        if (gf_uuid_is_null(replies[i].poststat.ia_gfid))
+            continue;
+
+        if (replies[i].poststat.ia_type == IA_INVAL)
+            continue;
+
+        if (ia_type == IA_INVAL || gf_uuid_is_null(gfid)) {
+            src_idx = i;
+            ia_type = replies[src_idx].poststat.ia_type;
+            gfid = &replies[src_idx].poststat.ia_gfid;
+            continue;
+        }
+
         if (gf_uuid_compare(gfid, replies[i].poststat.ia_gfid) &&
             (ia_type == replies[i].poststat.ia_type)) {
             ret = afr_gfid_split_brain_source(this, replies, inode, pargfid,