2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (C) 2014 SUSE Linux Products GmbH. All Rights Reserved.
7 # This test was motivated by btrfs issues, but it's generic enough as it
8 # doesn't use any btrfs specific features.
10 # Stress btrfs' block group allocation and deallocation while running fstrim in
11 # parallel. Part of the goal is also to get data block groups deallocated so
12 # that new metadata block groups, using the same physical device space ranges,
13 # get allocated while fstrim is running. This caused several issues ranging
14 # from invalid memory accesses, kernel crashes, metadata or data corruption,
15 # free space cache inconsistencies, free space leaks and memory leaks.
17 # These issues were fixed by the following btrfs linux kernel patches:
19 # Btrfs: fix invalid block group rbtree access after bg is removed
20 # Btrfs: fix crash caused by block group removal
21 # Btrfs: fix freeing used extents after removing empty block group
22 # Btrfs: fix race between fs trimming and block group remove/allocation
23 # Btrfs: fix race between writing free space cache and trimming
24 # Btrfs: make btrfs_abort_transaction consider existence of new block groups
25 # Btrfs: fix memory leak after block remove + trimming
26 # Btrfs: fix fs mapping extent map leak
27 # Btrfs: fix unprotected deletion from pending_chunks list
29 # The issues were found on a qemu/kvm guest with 4 virtual CPUs, 4Gb of ram and
30 # scsi-hd devices with discard support enabled (that means hole punching in the
31 # disk's image file is performed by the host).
34 _begin_fstest auto stress trim
36 # Override the default cleanup function.
42 # Import common functions.
45 # real QA test starts here
48 _require_xfs_io_command "falloc"
50 # Keep allocating and deallocating 1G of data space with the goal of creating
51 # and deleting 1 block group constantly. The intention is to race with the
55 # Wait for running subcommand before exitting so that
56 # mountpoint is not busy when we try to unmount it
57 trap "wait; exit" SIGTERM
61 $XFS_IO_PROG -f -c "falloc -k 0 1G" \
62 $SCRATCH_MNT/$name &> /dev/null
64 $XFS_IO_PROG -c "truncate 0" \
65 $SCRATCH_MNT/$name &> /dev/null
72 # Wait for running subcommand before exitting so that
73 # mountpoint is not busy when we try to unmount it
74 trap "wait; exit" SIGTERM
77 $FSTRIM_PROG $SCRATCH_MNT
81 # Create a bunch of small files that get their single extent inlined in the
82 # btree, so that we consume a lot of metadata space and get a chance of a
83 # data block group getting deleted and reused for metadata later. Sometimes
84 # the creation of all these files succeeds other times we get ENOSPC failures
85 # at some point - this depends on how fast the btrfs' cleaner kthread is
86 # notified about empty block groups, how fast it deletes them and how fast
87 # the fallocate calls happen. So we don't really care if they all succeed or
88 # not, the goal is just to keep metadata space usage growing while data block
91 # Creating 200,000 files sequentially is really slow, so speed it up a bit
92 # by doing it concurrently with 4 threads in 4 separate directories.
93 nr_files=$((50000 * LOAD_FACTOR))
98 for ((n = 0; n < 4; n++)); do
101 trap "wait; exit" SIGTERM
103 for ((i = 1; i <= $nr_files; i++)); do
104 $XFS_IO_PROG -f -c "pwrite -S 0xaa 0 3900" \
105 $SCRATCH_MNT/$n/"${prefix}_$i" &> /dev/null
106 if [ $? -ne 0 ]; then
107 echo "Failed creating file $n/${prefix}_$i" >>$seqres.full
115 wait ${create_pids[@]}
119 _scratch_mkfs >>$seqres.full 2>&1
121 _require_fs_space $SCRATCH_MNT $((10 * 1024 * 1024))
122 _require_batched_discard $SCRATCH_MNT
124 for ((i = 0; i < $((4 * $LOAD_FACTOR)); i++)); do
129 for ((i = 0; i < $((1 * $LOAD_FACTOR)); i++)); do
130 fallocate_loop "falloc_file_$i" &
131 fallocate_pids[$i]=$!
134 create_files "foobar"
136 kill ${fallocate_pids[@]}
140 # The fstests framework will now check for fs consistency with fsck.
141 # The trimming was racy and caused some btree nodes to get full of zeroes on
142 # disk, which obviously caused fs metadata corruption. The race often lead
143 # to missing free space entries in a block group's free space cache too.
145 echo "Silence is golden"