features/bitrot: Fail node-uuid getxattr if file is marked bad

If xattr is node-uuid and the inode is marked bad, fail getxattr
and fgetxattr with EIO. Returning EIO would result in AFR to
choose correct node-uuid coresponding to the subvolume where
the good copy of the file resides.

Change-Id: I45a42ca38f8322d2b10f3c4c48dc504521162b42
BUG: 1294786
Signed-off-by: Kotresh HR <khiremat@redhat.com>
Reviewed-on: http://review.gluster.org/13116
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>

tests/bitrot/bug-1294786.t

@@ -0,0 +1,68 @@
+#!/bin/bash
+
+. $(dirname $0)/../include.rc
+. $(dirname $0)/../volume.rc
+. $(dirname $0)/../cluster.rc
+
+function get_bitd_count_1 {
+        ps auxww | grep glusterfs | grep bitd.pid | grep -v grep | grep $H1 | wc -l
+}
+
+function get_bitd_count_2 {
+        ps auxww | grep glusterfs | grep bitd.pid | grep -v grep | grep $H2 | wc -l
+}
+
+function get_node_uuid {
+        getfattr -n trusted.glusterfs.node-uuid --only-values $M0/FILE 2>/dev/null
+}
+
+cleanup;
+
+TEST launch_cluster 2
+
+TEST $CLI_1 peer probe $H2;
+EXPECT_WITHIN $PROBE_TIMEOUT 1 peer_count;
+
+TEST $CLI_1 volume create $V0 replica 2 $H1:$B1 $H2:$B2
+EXPECT 'Created' volinfo_field_1 $V0 'Status';
+
+TEST $CLI_1 volume start $V0
+EXPECT 'Started' volinfo_field_1 $V0 'Status';
+
+uuid1=$($CLI_1 system:: uuid get | awk '{print $2}')
+uuid2=$($CLI_2 system:: uuid get | awk '{print $2}')
+
+##Mount $V0
+TEST $GFS --volfile-id=$V0 --volfile-server=$H1 $M0
+
+#Enable bitrot
+TEST $CLI_1 volume bitrot $V0 enable
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" get_bitd_count_1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" get_bitd_count_2
+
+#Create sample file
+TEST `echo "1234" > $M0/FILE`
+
+EXPECT "$uuid1" get_node_uuid;
+
+#Corrupt file from back-end
+TEST stat $B1/FILE
+echo "Corrupted data" >> $B1/FILE
+#Manually set bad-file xattr since we can't wait for an hour for scrubber.
+TEST setfattr -n trusted.bit-rot.bad-file -v 0x3100 $B1/FILE
+
+TEST $CLI_1 volume stop $V0
+TEST $CLI_1 volume start $V0
+EXPECT 'Started' volinfo_field_1 $V0 'Status';
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status_1 $V0 $H1 $B1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status_1 $V0 $H2 $B2
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status $V0 0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status $V0 1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" get_bitd_count_1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" get_bitd_count_2
+#Trigger lookup so that bitrot xlator marks file as bad in its inode context.
+TEST stat $M0/FILE
+
+EXPECT "$uuid2" get_node_uuid;
+
+cleanup;

tests/cluster.rc

@@ -170,3 +170,10 @@ function volinfo_field_2()
 
     $CLI_2 volume info $vol | grep "^$field: " | sed 's/.*: //';
 }
+
+function brick_up_status_1 {
+        local vol=$1
+        local host=$2
+        local brick=$3
+        $CLI_1 volume status $vol $host:$brick --xml | sed -ne 's/.*<status>\([01]\)<\/status>/\1/p'
+}

xlators/features/bit-rot/src/stub/bit-rot-stub.c

@@ -1605,6 +1605,17 @@ br_stub_getxattr (call_frame_t *frame, xlator_t *this,
                 goto wind;
         }
 
+        /**
+         * If xattr is node-uuid and the inode is marked bad, return EIO.
+         * Returning EIO would result in AFR to choose correct node-uuid
+         * coresponding to the subvolume * where the good copy of the
+         * file resides.
+         */
+        if (IA_ISREG (loc->inode->ia_type) && XATTR_IS_NODE_UUID (name) &&
+            br_stub_check_bad_object (this, loc->inode, &op_ret, &op_errno)) {
+                goto unwind;
+        }
+
         if (br_stub_is_internal_xattr (name))
                 goto unwind;
 
@@ -1668,6 +1679,17 @@ br_stub_fgetxattr (call_frame_t *frame, xlator_t *this,
                 goto wind;
         }
 
+        /**
+         * If xattr is node-uuid and the inode is marked bad, return EIO.
+         * Returning EIO would result in AFR to choose correct node-uuid
+         * coresponding to the subvolume * where the good copy of the
+         * file resides.
+         */
+        if (IA_ISREG (fd->inode->ia_type) && XATTR_IS_NODE_UUID (name) &&
+            br_stub_check_bad_object (this, fd->inode, &op_ret, &op_errno)) {
+                goto unwind;
+        }
+
         if (br_stub_is_internal_xattr (name))
                 goto unwind;