tests: Fix split-brain-favorite-child-policy.t failures

Problem:
In CentOS-7, the file was receving an extra removexattr(security.ima)
FOP which changed its ctime, breaking the assumption that a particular brick
had the latest ctime based on the writevs done in the .t

Fix:
1. Compare the ctime of both files in the backend and pick the one with
the latest ctime for the fav-child policy. Also unmount the volume
before comparing, to avoid any further FOPS on the file that
can possibly modify the timestamps.

2. Added floating point handling in stat function. Thanks to Pranith for
the helping debugging the regex.

> Reviewed-on: http://review.gluster.org/16288
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
(cherry picked from commit 76fff8cb2a164b596ca67e65c99623f5b68361fd)


Change-Id: I06041a0f39a29d2593b867af8685d65c7cd99150
BUG: 1410072
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-on: http://review.gluster.org/16323
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

2 files changed, 15 insertions, 4 deletions

diff --git a/tests/basic/afr/split-brain-favorite-child-policy.t b/tests/basic/afr/split-brain-favorite-child-policy.t
index 7a14852685c..3df8e718bf0 100644
--- a/tests/basic/afr/split-brain-favorite-child-policy.t
+++ b/tests/basic/afr/split-brain-favorite-child-policy.t
@@ -42,8 +42,15 @@ TEST $CLI volume heal $V0
 cat $M0/file > /dev/null
 EXPECT "1" echo $?
 
-#We know that the first brick has latest ctime.
-LATEST_CTIME_MD5=$(md5sum $B0/${V0}0/file | cut -d\  -f1)
+# Umount to prevent further FOPS on the file, then find the brick with latest ctime.
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
+ctime1=`stat -c "%.Z"  $B0/${V0}0/file`
+ctime2=`stat -c "%.Z"  $B0/${V0}1/file`
+if (( $(echo "$ctime1 > $ctime2" | bc -l) )); then
+        LATEST_CTIME_MD5=$(md5sum $B0/${V0}0/file | cut -d\  -f1)
+else
+        LATEST_CTIME_MD5=$(md5sum $B0/${V0}1/file | cut -d\  -f1)
+fi
 TEST $CLI volume set $V0 cluster.favorite-child-policy ctime
 TEST $CLI volume start $V0 force
 EXPECT_WITHIN $PROCESS_UP_TIMEOUT "Y" glustershd_up_status
@@ -51,10 +58,13 @@ 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
 TEST $CLI volume heal $V0
 EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
+B0_MD5=$(md5sum $B0/${V0}0/file | cut -d\  -f1)
+B1_MD5=$(md5sum $B0/${V0}1/file | cut -d\  -f1)
+TEST [ "$LATEST_CTIME_MD5" == "$B0_MD5" ]
+TEST [ "$LATEST_CTIME_MD5" == "$B1_MD5" ]
+TEST glusterfs --volfile-id=/$V0 --volfile-server=$H0 $M0 --attribute-timeout=0 --entry-timeout=0
 cat $M0/file > /dev/null
 EXPECT "0" echo $?
-HEALED_MD5=$(md5sum $B0/${V0}1/file | cut -d\  -f1)
-TEST [ "$LATEST_CTIME_MD5" == "$HEALED_MD5" ]
 
 ############ Healing using favorite-child-policy = mtime #################
 TEST $CLI volume set $V0 cluster.favorite-child-policy none
diff --git a/tests/include.rc b/tests/include.rc
index b9e27063196..c00e36aed1a 100644
--- a/tests/include.rc
+++ b/tests/include.rc
@@ -414,6 +414,7 @@ stat -c %s /dev/null > /dev/null 2>&1 || {
          *%Y*) cmd="${cmd} s/%Y/`$( which stat ) -f %m $f`/g;" ;&
          *%X*) cmd="${cmd} s/%X/`$( which stat ) -f %a $f`/g;" ;&
          *%Z*) cmd="${cmd} s/%Z/`$( which stat ) -f %c $f`/g;" ;&
+         *%.Z*) cmd="${cmd} s/%.Z/`$( which stat ) -f %.9Fc $f`/g;" ;&
          *%b*) cmd="${cmd} s/%b/`$( which stat ) -f %b $f`/g;" ;&
          *%B*) cmd="${cmd} s/%B/512/g;" ;&
          *%t*) cmd="${cmd} s/%t/`$( which stat ) -f %XHr $f`/g;" ;&