2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
7 # Stress send running in parallel with balance and deduplication against files
8 # that belong to the snapshots used by send. The goal is to verify that these
9 # operations running in parallel do not lead to send crashing (trigger assertion
10 # failures and BUG_ONs), or send finding an inconsistent snapshot that leads to
11 # a failure (reported in dmesg/syslog). The test needs big trees (snapshots)
12 # with large differences between the parent and send snapshots in order to hit
13 # such issues with a good probability.
16 seqres=$RESULT_DIR/$seq
17 echo "QA output created by $seq"
19 status=1 # failure is the default!
20 trap "_cleanup; exit \$status" 0 1 2 3 15
28 # get standard environment, filters and checks
34 # real QA test starts here
36 _require_scratch_dedupe
41 # We at least need 8GB of free space on $SCRATCH_DEV
42 _require_scratch_size $((8 * 1024 * 1024))
44 _scratch_mkfs >>$seqres.full 2>&1
49 trap "wait; exit" SIGTERM
51 local f1=$(find $SCRATCH_MNT/snap1 -type f | shuf -n 1)
52 local f2=$(find $SCRATCH_MNT/snap2 -type f | shuf -n 1)
54 if (( RANDOM % 2 )); then
60 # Ignore errors from dedupe. We just want to test for crashes and
62 $XFS_IO_PROG -r -c "dedupe $f1 0 0 64K" $f2 &> /dev/null
67 trap "wait; exit" SIGTERM
70 for ((i = 1; i <= 5; i++)); do
79 trap "wait; exit" SIGTERM
82 # Balance only metadata block groups, since this is makes it
83 # easier to hit problems (crashes and errors) in send.
84 # Ignore errors from balance. We just want to test for crashes
86 _run_btrfs_balance_start -f -m $SCRATCH_MNT &> /dev/null
93 trap "wait; exit" SIGTERM
97 for ((i = 1; i <= $count; i++)); do
98 # Ignore errors from send. We will check for errors later in
100 $BTRFS_UTIL_PROG send -f /dev/null \
101 $SCRATCH_MNT/snap1 &> /dev/null
102 sleep $((RANDOM % 3))
108 trap "wait; exit" SIGTERM
112 for ((i = 1; i <= $count; i++)); do
113 # Ignore errors from send. We will check for errors later in
115 $BTRFS_UTIL_PROG send -f /dev/null \
116 -p $SCRATCH_MNT/snap1 $SCRATCH_MNT/snap2 &> /dev/null
117 sleep $((RANDOM % 3))
126 for ((i = 1; i <= $count; i++)); do
127 $XFS_IO_PROG -f -c "pwrite -S 0xea 0 64K" \
128 $SCRATCH_MNT/file_$((i + offset)) >/dev/null
137 for ((i = 1; i <= $count; i++)); do
138 $SETFATTR_PROG -n 'user.x1' -v $xattr_value \
139 $SCRATCH_MNT/file_$((i + offset))
143 # Number of files created before first snapshot. Must be divisable by 4.
144 nr_initial_files=40000
145 # Number of files created after the first snapshot. Must be divisable by 4.
148 # Create initial files.
149 step=$((nr_initial_files / 4))
150 for ((n = 0; n < 4; n++)); do
151 offset=$((step * $n))
152 write_files_loop $step $offset &
155 wait ${create_pids[@]}
157 $BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap1 \
160 # Add some more files, so that that are substantial differences between the
161 # two test snapshots used for an incremental send later.
164 step=$((nr_more_files / 4))
165 for ((n = 0; n < 4; n++)); do
166 offset=$((nr_initial_files + step * $n))
167 write_files_loop $step $offset &
170 wait ${create_pids[@]}
172 # Add some xattrs to all files, so that every leaf and node of the fs tree is
173 # COWed. Adding more files does only adds leafs and nodes to the tree's right
174 # side, since inode numbers are based on a counter and form the first part
175 # (objectid) of btree keys (we only modifying the right most leaf of the tree).
176 # Use large values for the xattrs to quickly increase the height of the tree.
177 xattr_value=$(printf '%0.sX' $(seq 1 3800))
179 # Split the work into 4 workers working on consecutive ranges to avoid contention
180 # on the same leafs as much as possible.
181 step=$(((nr_more_files + nr_initial_files) / 4))
182 for ((n = 0; n < 4; n++)); do
183 offset=$((step * $n))
184 set_xattrs_loop $step $offset &
187 wait ${setxattr_pids[@]}
189 $BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap2 \
213 # Check for errors messages that happen due to inconsistent snapshot caused by
214 # deduplication and balance running in parallel with send, causing btree nodes
215 # and leafs to disappear and getting reused while send is using them.
219 # BTRFS error (device sdc): did not find backref in send_root. inode=63292, \
220 # offset=0, disk_byte=5228134400 found extent=5228134400
222 # BTRFS error (device sdc): parent transid verify failed on 32243712 wanted 24 \
225 _dmesg_since_test_start | egrep -e '\bBTRFS error \(device .*?\):'