[v3] generic: add a test for umount racing mount
diff mbox series

Message ID 20200713204639.1271794-1-boris@bur.io
State New
Headers show
Series
  • [v3] generic: add a test for umount racing mount
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Commit Message

Boris Burkov July 13, 2020, 8:46 p.m. UTC
Test if dirtying many inodes (which can delay umount) then
unmounting and quickly mounting again causes the mount to fail.

A race, which breaks the test in btrfs, is fixed by the patch:
"btrfs: fix mount failure caused by race with umount"

Signed-off-by: Boris Burkov <boris@bur.io>
---
 tests/generic/603     | 53 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/603.out |  2 ++
 tests/generic/group   |  1 +
 3 files changed, 56 insertions(+)
 create mode 100755 tests/generic/603
 create mode 100644 tests/generic/603.out

Comments

Zorro Lang July 14, 2020, 5:21 a.m. UTC | #1
On Mon, Jul 13, 2020 at 01:46:39PM -0700, Boris Burkov wrote:
> Test if dirtying many inodes (which can delay umount) then
> unmounting and quickly mounting again causes the mount to fail.
> 
> A race, which breaks the test in btrfs, is fixed by the patch:
> "btrfs: fix mount failure caused by race with umount"
> 
> Signed-off-by: Boris Burkov <boris@bur.io>
> ---

If Eryu won't tend to change dd to XFS_IO_PROG, this version is good to me:)

Reviewed-by: Zorro Lang <zlang@redhat.com>

Thanks,
Zorro

>  tests/generic/603     | 53 +++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/603.out |  2 ++
>  tests/generic/group   |  1 +
>  3 files changed, 56 insertions(+)
>  create mode 100755 tests/generic/603
>  create mode 100644 tests/generic/603.out
> 
> diff --git a/tests/generic/603 b/tests/generic/603
> new file mode 100755
> index 00000000..8e9a80e6
> --- /dev/null
> +++ b/tests/generic/603
> @@ -0,0 +1,53 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2020 Facebook  All Rights Reserved.
> +#
> +# FS QA Test 603
> +#
> +# Evicting dirty inodes can take a long time during umount.
> +# Check that a new mount racing with such a delayed umount succeeds.
> +#
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +	cd /
> +	rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs generic
> +_supported_os Linux
> +_require_scratch
> +
> +_scratch_mkfs > /dev/null 2>&1
> +_scratch_mount
> +for i in $(seq 0 500)
> +do
> +	dd if=/dev/zero of="$SCRATCH_MNT/$i" bs=1M count=1 > /dev/null 2>&1
> +done
> +_scratch_unmount &
> +_scratch_mount
> +wait
> +
> +echo "Silence is golden"
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/603.out b/tests/generic/603.out
> new file mode 100644
> index 00000000..6810da89
> --- /dev/null
> +++ b/tests/generic/603.out
> @@ -0,0 +1,2 @@
> +QA output created by 603
> +Silence is golden
> diff --git a/tests/generic/group b/tests/generic/group
> index d9ab9a31..c0ace35b 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -605,3 +605,4 @@
>  600 auto quick quota
>  601 auto quick quota
>  602 auto quick encrypt
> +603 auto quick
> -- 
> 2.24.1
>
Eryu Guan July 19, 2020, 5:18 p.m. UTC | #2
On Mon, Jul 13, 2020 at 01:46:39PM -0700, Boris Burkov wrote:
> Test if dirtying many inodes (which can delay umount) then
> unmounting and quickly mounting again causes the mount to fail.
> 
> A race, which breaks the test in btrfs, is fixed by the patch:
> "btrfs: fix mount failure caused by race with umount"
> 
> Signed-off-by: Boris Burkov <boris@bur.io>
> ---
>  tests/generic/603     | 53 +++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/603.out |  2 ++
>  tests/generic/group   |  1 +
>  3 files changed, 56 insertions(+)
>  create mode 100755 tests/generic/603
>  create mode 100644 tests/generic/603.out
> 
> diff --git a/tests/generic/603 b/tests/generic/603
> new file mode 100755
> index 00000000..8e9a80e6
> --- /dev/null
> +++ b/tests/generic/603
> @@ -0,0 +1,53 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2020 Facebook  All Rights Reserved.
> +#
> +# FS QA Test 603
> +#
> +# Evicting dirty inodes can take a long time during umount.
> +# Check that a new mount racing with such a delayed umount succeeds.
> +#
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +	cd /
> +	rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs generic
> +_supported_os Linux
> +_require_scratch

Ah, it's fixed in v3, so ignore my first comment in the reply to v2 :)

Thanks,
Eryu

> +
> +_scratch_mkfs > /dev/null 2>&1
> +_scratch_mount
> +for i in $(seq 0 500)
> +do
> +	dd if=/dev/zero of="$SCRATCH_MNT/$i" bs=1M count=1 > /dev/null 2>&1
> +done
> +_scratch_unmount &
> +_scratch_mount
> +wait
> +
> +echo "Silence is golden"
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/603.out b/tests/generic/603.out
> new file mode 100644
> index 00000000..6810da89
> --- /dev/null
> +++ b/tests/generic/603.out
> @@ -0,0 +1,2 @@
> +QA output created by 603
> +Silence is golden
> diff --git a/tests/generic/group b/tests/generic/group
> index d9ab9a31..c0ace35b 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -605,3 +605,4 @@
>  600 auto quick quota
>  601 auto quick quota
>  602 auto quick encrypt
> +603 auto quick
> -- 
> 2.24.1

Patch
diff mbox series

diff --git a/tests/generic/603 b/tests/generic/603
new file mode 100755
index 00000000..8e9a80e6
--- /dev/null
+++ b/tests/generic/603
@@ -0,0 +1,53 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2020 Facebook  All Rights Reserved.
+#
+# FS QA Test 603
+#
+# Evicting dirty inodes can take a long time during umount.
+# Check that a new mount racing with such a delayed umount succeeds.
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os Linux
+_require_scratch
+
+_scratch_mkfs > /dev/null 2>&1
+_scratch_mount
+for i in $(seq 0 500)
+do
+	dd if=/dev/zero of="$SCRATCH_MNT/$i" bs=1M count=1 > /dev/null 2>&1
+done
+_scratch_unmount &
+_scratch_mount
+wait
+
+echo "Silence is golden"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/603.out b/tests/generic/603.out
new file mode 100644
index 00000000..6810da89
--- /dev/null
+++ b/tests/generic/603.out
@@ -0,0 +1,2 @@ 
+QA output created by 603
+Silence is golden
diff --git a/tests/generic/group b/tests/generic/group
index d9ab9a31..c0ace35b 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -605,3 +605,4 @@ 
 600 auto quick quota
 601 auto quick quota
 602 auto quick encrypt
+603 auto quick