btrfs: test cleaning up of the stale device

Recreating a new filesystem or adding a device to a mounted the
filesystem should remove the device entries under its previous fsid
even when confused with different device paths to the same device.

Fixed by the kernel patch (in the ml):

  btrfs: harden identification of the stale device

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

diff --git a/tests/btrfs/254 b/tests/btrfs/254
new file mode 100755 (executable)
index 0000000..b70b9d1
--- /dev/null
+++ b/tests/btrfs/254
@@ -0,0 +1,113 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2021 Anand Jain. All Rights Reserved.
+# Copyright (c) 2021 Oracle. All Rights Reserved.
+#
+# FS QA Test No. 254
+#
+# Test if the kernel can free the stale device entries.
+#
+# Tests bug fixed by the kernel patch:
+#      btrfs: harden identification of the stale device
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+# Override the default cleanup function.
+node=$seq-test
+cleanup_dmdev()
+{
+       _dmsetup_remove $node
+}
+
+_cleanup()
+{
+       cd /
+       rm -f $tmp.*
+       rm -rf $seq_mnt > /dev/null 2>&1
+       cleanup_dmdev
+}
+
+# Import common functions.
+. ./common/filter
+. ./common/filter.btrfs
+
+# real QA test starts here
+_supported_fs btrfs
+_require_scratch_dev_pool 3
+_require_block_device $SCRATCH_DEV
+_require_dm_target linear
+_require_btrfs_forget_or_module_loadable
+_require_scratch_nocheck
+_require_command "$WIPEFS_PROG" wipefs
+
+_scratch_dev_pool_get 3
+
+setup_dmdev()
+{
+       # Some small size.
+       size=$((1024 * 1024 * 1024))
+       size_in_sector=$((size / 512))
+
+       table="0 $size_in_sector linear $SCRATCH_DEV 0"
+       _dmsetup_create $node --table "$table" || \
+               _fail "setup dm device failed"
+}
+
+# Use a known it is much easier to debug.
+uuid="--uuid 12345678-1234-1234-1234-123456789abc"
+lvdev=/dev/mapper/$node
+
+seq_mnt=$TEST_DIR/$seq.mnt
+mkdir -p $seq_mnt
+
+test_forget()
+{
+       setup_dmdev
+       dmdev=$(realpath $lvdev)
+
+       _mkfs_dev $uuid $dmdev
+
+       # Check if we can un-scan using the mapper device path.
+       $BTRFS_UTIL_PROG device scan --forget $lvdev
+
+       # Cleanup
+       $WIPEFS_PROG -a $lvdev > /dev/null 2>&1
+       $BTRFS_UTIL_PROG device scan --forget
+
+       cleanup_dmdev
+}
+
+test_add_device()
+{
+       setup_dmdev
+       dmdev=$(realpath $lvdev)
+       scratch_dev2=$(echo $SCRATCH_DEV_POOL | awk '{print $2}')
+       scratch_dev3=$(echo $SCRATCH_DEV_POOL | awk '{print $3}')
+
+       _mkfs_dev $scratch_dev3
+       _mount $scratch_dev3 $seq_mnt
+
+       _mkfs_dev $uuid -draid1 -mraid1 $lvdev $scratch_dev2
+
+       # Add device should free the device under $uuid in the kernel.
+       $BTRFS_UTIL_PROG device add -f $dmdev $seq_mnt > /dev/null 2>&1
+
+       _mount -o degraded $scratch_dev2 $SCRATCH_MNT
+
+       # Check if the missing device is shown.
+       $BTRFS_UTIL_PROG filesystem show -m $SCRATCH_MNT | \
+                                       _filter_btrfs_filesystem_show
+
+       $UMOUNT_PROG $seq_mnt
+       _scratch_unmount
+       cleanup_dmdev
+}
+
+test_forget
+test_add_device
+
+_scratch_dev_pool_put
+
+status=0
+exit

diff --git a/tests/btrfs/254.out b/tests/btrfs/254.out
new file mode 100644 (file)
index 0000000..20819cf
--- /dev/null
+++ b/tests/btrfs/254.out
@@ -0,0 +1,6 @@
+QA output created by 254
+Label: none  uuid: <UUID>
+       Total devices <NUM> FS bytes used <SIZE>
+       devid <DEVID> size <SIZE> used <SIZE> path SCRATCH_DEV
+       *** Some devices missing
+