2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2018 Red Hat Inc. All Rights Reserved.
7 # Race test running out of data space with concurrent discard operation on
10 # If a user constructs a test that loops repeatedly over below steps on
11 # dm-thin, block allocation can fail due to discards not having completed
12 # yet (Fixed by a685557 dm thin: handle running out of data space vs
13 # concurrent discard):
14 # 1) fill thin device via filesystem file
18 # And this maybe cause a deadlock when racing a fstrim with a filesystem
19 # (XFS) shutdown. (Fixed by 8c81dd46ef3c Force log to disk before reading
20 # the AGF during a fstrim)
23 _begin_fstest auto thin trim
25 # Override the default cleanup function.
33 # Import common functions.
37 # real QA test starts here
39 _require_scratch_nocheck
40 _require_dm_target thin-pool
42 # The unlink below will result in new metadata blocks for btrfs because of CoW,
43 # and since we've filled the thinp device it'll return EIO, which will make
44 # btrfs flip read only, making it fail this test when it just won't work right
45 # for us in the first place.
46 test $FSTYP == "btrfs" && _notrun "btrfs doesn't work that way lol"
48 # Require underlying device support discard
49 _scratch_mkfs >>$seqres.full 2>&1
51 _require_batched_discard $SCRATCH_MNT
54 # Create a thin pool and a *slightly smaller* thin volume, it's helpful
55 # to reproduce the bug
56 BACKING_SIZE=$((128 * 1024 * 1024 / 512)) # 128M
57 VIRTUAL_SIZE=$((BACKING_SIZE + 1024)) # 128M + 1k
58 CLUSTER_SIZE=$((64 * 1024 / 512)) # 64K
60 _dmthin_init $BACKING_SIZE $VIRTUAL_SIZE $CLUSTER_SIZE 0
65 # There're two bugs at here, one is dm-thin bug, the other is filesystem
66 # (XFS especially) bug. The dm-thin bug can't handle running out of data
67 # space with concurrent discard well. Then the dm-thin bug cause fs unmount
68 # hang when racing a fstrim with a filesystem shutdown.
70 # If both of two bugs haven't been fixed, below test maybe cause deadlock.
71 # Else if the fs bug has been fixed, but the dm-thin bug hasn't. below test
72 # will cause the test fail (no deadlock).
73 # Else the test will pass.
74 for ((i=0; i<20; i++)); do
75 $XFS_IO_PROG -f -c "pwrite -b 64k 0 256M" \
76 $SCRATCH_MNT/testfile &>/dev/null
77 rm -f $SCRATCH_MNT/testfile
78 $FSTRIM_PROG $SCRATCH_MNT
84 echo "Silence is golden"