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 $seq"
19 status=1 # failure is the default!
20 trap "_cleanup; exit \$status" 0 1 2 3 15
28 # get standard environment, filters and checks
34 # real QA test starts here
37 _require_scratch_dedupe
42 _scratch_mkfs >>$seqres.full 2>&1
47 trap "wait; exit" SIGTERM
49 local f1=$(find $SCRATCH_MNT/snap1 -type f | shuf -n 1)
50 local f2=$(find $SCRATCH_MNT/snap2 -type f | shuf -n 1)
52 if (( RANDOM % 2 )); then
58 # Ignore errors from dedupe. We just want to test for crashes and
60 $XFS_IO_PROG -r -c "dedupe $f1 0 0 64K" $f2 &> /dev/null
65 trap "wait; exit" SIGTERM
68 for ((i = 1; i <= 5; i++)); do
77 trap "wait; exit" SIGTERM
80 # Balance only metadata block groups, since this is makes it
81 # easier to hit problems (crashes and errors) in send.
82 # Ignore errors from balance. We just want to test for crashes
84 $BTRFS_UTIL_PROG balance start -f -m $SCRATCH_MNT &> /dev/null
91 trap "wait; exit" SIGTERM
95 for ((i = 1; i <= $count; i++)); do
96 # Ignore errors from send. We will check for errors later in
98 $BTRFS_UTIL_PROG send -f /dev/null \
99 $SCRATCH_MNT/snap1 &> /dev/null
100 sleep $((RANDOM % 3))
106 trap "wait; exit" SIGTERM
110 for ((i = 1; i <= $count; i++)); do
111 # Ignore errors from send. We will check for errors later in
113 $BTRFS_UTIL_PROG send -f /dev/null \
114 -p $SCRATCH_MNT/snap1 $SCRATCH_MNT/snap2 &> /dev/null
115 sleep $((RANDOM % 3))
124 for ((i = 1; i <= $count; i++)); do
125 $XFS_IO_PROG -f -c "pwrite -S 0xea 0 64K" \
126 $SCRATCH_MNT/file_$((i + offset)) >/dev/null
135 for ((i = 1; i <= $count; i++)); do
136 $SETFATTR_PROG -n 'user.x1' -v $xattr_value \
137 $SCRATCH_MNT/file_$((i + offset))
141 # Number of files created before first snapshot. Must be divisable by 4.
142 nr_initial_files=40000
143 # Number of files created after the first snapshot. Must be divisable by 4.
146 # Create initial files.
147 step=$((nr_initial_files / 4))
148 for ((n = 0; n < 4; n++)); do
149 offset=$((step * $n))
150 write_files_loop $step $offset &
153 wait ${create_pids[@]}
155 $BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap1 \
158 # Add some more files, so that that are substantial differences between the
159 # two test snapshots used for an incremental send later.
162 step=$((nr_more_files / 4))
163 for ((n = 0; n < 4; n++)); do
164 offset=$((nr_initial_files + step * $n))
165 write_files_loop $step $offset &
168 wait ${create_pids[@]}
170 # Add some xattrs to all files, so that every leaf and node of the fs tree is
171 # COWed. Adding more files does only adds leafs and nodes to the tree's right
172 # side, since inode numbers are based on a counter and form the first part
173 # (objectid) of btree keys (we only modifying the right most leaf of the tree).
174 # Use large values for the xattrs to quickly increase the height of the tree.
175 xattr_value=$(printf '%0.sX' $(seq 1 3800))
177 # Split the work into 4 workers working on consecutive ranges to avoid contention
178 # on the same leafs as much as possible.
179 step=$(((nr_more_files + nr_initial_files) / 4))
180 for ((n = 0; n < 4; n++)); do
181 offset=$((step * $n))
182 set_xattrs_loop $step $offset &
185 wait ${setxattr_pids[@]}
187 $BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap2 \
211 # Check for errors messages that happen due to inconsistent snapshot caused by
212 # deduplication and balance running in parallel with send, causing btree nodes
213 # and leafs to disappear and getting reused while send is using them.
217 # BTRFS error (device sdc): did not find backref in send_root. inode=63292, \
218 # offset=0, disk_byte=5228134400 found extent=5228134400
220 # BTRFS error (device sdc): parent transid verify failed on 32243712 wanted 24 \
223 _dmesg_since_test_start | egrep -e '\bBTRFS error \(device .*?\):'