[PATCH 3/4] xfs/049: umount -d fails when kernel wins teardown race

[Dave Chinner <david@fromorbit.com>]

From: Dave Chinner <dchinner@redhat.com>

When /etc/mtab is linked to /proc/mounts and we are using mount time
created loop devices (i.e. mount -o loop), the unmount can fail
with this amazingly informative error message:

umount: /mnt/scratch/test2: filesystem was unmounted, but mount(8) failed: Invalid argument

What it actually means in this case is that the kernel tore down the
loop device when the last reference went away, and it did it so fast
that mount was not able to find it in /etc/mtab after the unmount
syscall. Hence it could not find the loop device it was supposed to
tear down and has a hissy fit.

This is simple to fix: mount does not need to tear down the loop
device as the kernel does it automatically. Remove the "-d" from
the umount command, and the test passes again.

There's quite a few other tests that also use umount -d - fix them
as well.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
 tests/xfs/049 | 8 ++++----
 tests/xfs/073 | 6 +++---
 tests/xfs/078 | 4 ++--
 tests/xfs/216 | 2 +-
 tests/xfs/217 | 2 +-
 tests/xfs/250 | 4 ++--
 6 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/tests/xfs/049 b/tests/xfs/049
index 04c2c75..8d4e074 100755
--- a/tests/xfs/049
+++ b/tests/xfs/049
@@ -29,8 +29,8 @@ echo "QA output created by $seq"
 _cleanup()
 {
     cd /
-    umount -d $SCRATCH_MNT/test2 > /dev/null 2>&1
-    umount -d $SCRATCH_MNT/test > /dev/null 2>&1
+    umount $SCRATCH_MNT/test2 > /dev/null 2>&1
+    umount $SCRATCH_MNT/test > /dev/null 2>&1
     rm -f $tmp.*
 
     if [ -w $seqres.full ]
@@ -123,11 +123,11 @@ rm -rf $SCRATCH_MNT/test/* >> $seqres.full 2>&1 \
     || _fail "!!! clean failed"
 
 _log "umount ext2 on xfs"
-umount -d $SCRATCH_MNT/test2 >> $seqres.full 2>&1 \
+umount $SCRATCH_MNT/test2 >> $seqres.full 2>&1 \
     || _fail "!!! umount ext2 failed"
 
 _log "umount xfs"
-umount -d $SCRATCH_MNT/test >> $seqres.full 2>&1 \
+umount $SCRATCH_MNT/test >> $seqres.full 2>&1 \
     || _fail "!!! umount xfs failed"
 
 echo "--- mounts at end (before cleanup)" >> $seqres.full
diff --git a/tests/xfs/073 b/tests/xfs/073
index f955771..38ed2cb 100755
--- a/tests/xfs/073
+++ b/tests/xfs/073
@@ -41,9 +41,9 @@ _cleanup()
 {
 	cd /
 	umount $SCRATCH_MNT 2>/dev/null
-	umount -d $imgs.loop 2>/dev/null
+	umount $imgs.loop 2>/dev/null
 	[ -d $imgs.loop ] && rmdir $imgs.loop
-	umount -d $imgs.source_dir 2>/dev/null
+	umount $imgs.source_dir 2>/dev/null
 	[ -d $imgs.source_dir ] && rm -rf $imgs.source_dir
 	rm -f $imgs.* $tmp.* /var/tmp/xfs_copy.log.*
 }
@@ -119,7 +119,7 @@ _verify_copy()
 
 	echo unmounting and removing new image
 	umount $source_dir
-	umount -d $target_dir > /dev/null 2>&1
+	umount $target_dir > /dev/null 2>&1
 	rm -f $target
 }
 
diff --git a/tests/xfs/078 b/tests/xfs/078
index f859efc..d8cb919 100755
--- a/tests/xfs/078
+++ b/tests/xfs/078
@@ -36,7 +36,7 @@ _cleanup()
 {
     cd /
     rm -f $tmp.*
-    umount -d $LOOP_MNT 2>/dev/null
+    umount $LOOP_MNT 2>/dev/null
     rmdir $LOOP_MNT
 }
 
@@ -97,7 +97,7 @@ _grow_loop()
 	$XFS_GROWFS_PROG $LOOP_MNT 2>&1 |  _filter_growfs 2>&1
 
 	echo "*** unmount"
-	umount -d $LOOP_MNT > /dev/null 2>&1
+	umount $LOOP_MNT > /dev/null 2>&1
 
 	# Large grows takes forever to check..
 	if [ "$check" -gt "0" ]
diff --git a/tests/xfs/216 b/tests/xfs/216
index 8513479..76f79ca 100755
--- a/tests/xfs/216
+++ b/tests/xfs/216
@@ -60,7 +60,7 @@ _do_mkfs()
 			-d name=$LOOP_DEV,size=${i}g |grep log
 		mount -o loop -t xfs $LOOP_DEV $LOOP_MNT
 		echo "test write" > $LOOP_MNT/test
-		umount -d $LOOP_MNT > /dev/null 2>&1
+		umount $LOOP_MNT > /dev/null 2>&1
 	done
 }
 # make large holey file
diff --git a/tests/xfs/217 b/tests/xfs/217
index ab55a30..8aacdf9 100755
--- a/tests/xfs/217
+++ b/tests/xfs/217
@@ -62,7 +62,7 @@ _do_mkfs()
 			-d name=$LOOP_DEV,size=${i}g |grep log
 		mount -o loop -t xfs $LOOP_DEV $LOOP_MNT
 		echo "test write" > $LOOP_MNT/test
-		umount -d $LOOP_MNT > /dev/null 2>&1
+		umount $LOOP_MNT > /dev/null 2>&1
 
 		# punch out the previous blocks so that we keep the amount of
 		# disk space the test requires down to a minimum.
diff --git a/tests/xfs/250 b/tests/xfs/250
index c1622a4..0cdc382 100755
--- a/tests/xfs/250
+++ b/tests/xfs/250
@@ -33,7 +33,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 _cleanup()
 {
 	cd /
-	umount -d $LOOP_MNT 2>/dev/null
+	umount $LOOP_MNT 2>/dev/null
 	rm -f $LOOP_DEV
 	rmdir $LOOP_MNT
 }
@@ -84,7 +84,7 @@ _test_loop()
 	xfs_io -f -c "resvsp 0 $fsize" $LOOP_MNT/foo | _filter_io
 
 	echo "*** unmount loop filesystem"
-	umount -d $LOOP_MNT > /dev/null 2>&1
+	umount $LOOP_MNT > /dev/null 2>&1
 
 	echo "*** check loop filesystem"
 	 _check_xfs_filesystem $LOOP_DEV none none
-- 
2.0.0