2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2014 Red Hat, Inc. All Rights Reserved.
5 # FS QA Test No. xfs/014
7 # Test the behavior of XFS dynamic speculative preallocation at ENOSPC and
8 # EDQUOT conditions. Speculative preallocation allocates post-EOF space to files
9 # as they are extended. This test creates conditions where an fs is near a space
10 # limit with lingering, relatively significant preallocations and verifies that
11 # new writers reclaim said preallocations rather than prematurely fail with
15 seqres=$RESULT_DIR/$seq
16 echo "QA output created by $seq"
20 status=1 # failure is the default!
22 # get standard environment, filters and checks
30 umount $LOOP_MNT 2>/dev/null
31 _scratch_unmount 2>/dev/null
34 trap "_cleanup; exit \$status" 0 1 2 3 15
36 # Create a file using a repeated open, extending write and close pattern. This
37 # causes the preallocation to persist after the file is closed. Preallocation
38 # will not be reclaimed unless the inode is evicted or we hit an allocation
46 # a few file extending open-write-close cycles should be enough to
47 # trigger the fs to retain preallocation. write 256k in 32k intervals to
49 for i in $(seq 0 32768 262144); do
50 $XFS_IO_PROG -f -c "pwrite $i 32k" $file >> $seqres.full
53 # write a 4k aligned amount of data to keep the calculations simple
54 $XFS_IO_PROG -c "pwrite 0 128m" $file >> $seqres.full
56 size=`_get_filesize $file`
57 blocks=`stat -c "%b" $file`
58 blocksize=`stat -c "%B" $file`
60 prealloc_size=$((blocks * blocksize - size))
61 if [ $prealloc_size -eq 0 ]; then
62 echo "Warning: No speculative preallocation for $file." \
63 "Check use of the allocsize= mount option."
66 # keep a running total of how much preallocation we've created
67 TOTAL_PREALLOC=$((TOTAL_PREALLOC + prealloc_size))
74 # allocate all but 10MB of available space
75 freesp=`$DF_PROG -m $dir | $AWK_PROG '/^\// { print $5 - 10 }'`
76 $XFS_IO_PROG -f -c "falloc 0 ${freesp}M" $dir/spc
79 # Create several files with preallocation and consume the remaining free space
80 # via fallocate to the put the fs at ENOSPC. Create a set of background writers
81 # to write into ENOSPC and cause the preallocation to be reclaimed and
82 # reallocated to the new writers.
90 for i in $(seq 0 3); do
91 _spec_prealloc_file $dir/pre$i
94 _consume_free_space $dir
96 # consume 1/2 of the current preallocation across the set of 4 writers
97 write_size=$((TOTAL_PREALLOC / 2 / 4))
98 for i in $(seq 0 3); do
101 for i in $(seq 0 3); do
102 $XFS_IO_PROG -f -c "pwrite 0 $write_size" $dir/file.$i \
109 # Create preallocations accounted by both user and group quotas. Set the
110 # associated quota hard limits to put them at EDQUOT. Verify that a new writer
111 # reclaims the preallocated space and proceeds without error.
119 _spec_prealloc_file $dir/user
120 chown $qa_user $dir/user
122 _spec_prealloc_file $dir/group
123 chgrp $qa_group $dir/group
125 # writing to a file under both quotas means both will be reclaimed on
128 chown $qa_user $dir/file
129 chgrp $qa_group $dir/file
131 # put both quotas at EDQUOT
132 blks=`$XFS_QUOTA_PROG -xc "quota -u $qa_user" $dir | \
133 tail -n 1 | awk '{ print $2 }'`
134 $XFS_QUOTA_PROG -xc "limit -u bhard=${blks}k $qa_user" $dir
135 blks=`$XFS_QUOTA_PROG -xc "quota -g $qa_group" $dir | \
136 tail -n 1 | awk '{ print $2 }'`
137 $XFS_QUOTA_PROG -xc "limit -g bhard=${blks}k $qa_group" $dir
139 # each quota has a single file worth of preallocation to reclaim. leave
140 # some wiggle room and write to 1/3 the total.
141 write_size=$((TOTAL_PREALLOC / 3))
142 $XFS_IO_PROG -c "pwrite 0 $write_size" $dir/file >> $seqres.full
145 # real QA test starts here
149 _require_xfs_io_command "falloc"
157 echo "Silence is golden."
159 _scratch_mkfs_xfs >> $seqres.full 2>&1
162 # make sure the background eofblocks scanner doesn't interfere
163 orig_sp_time=`cat /proc/sys/fs/xfs/speculative_prealloc_lifetime`
164 echo 9999 > /proc/sys/fs/xfs/speculative_prealloc_lifetime
166 LOOP_FILE=$SCRATCH_MNT/$seq.fs
167 LOOP_MNT=$SCRATCH_MNT/$seq.mnt
169 $MKFS_XFS_PROG -d "file=1,name=$LOOP_FILE,size=10g" >> $seqres.full 2>&1
172 mount -t xfs -o loop,uquota,gquota $LOOP_FILE $LOOP_MNT || \
173 _fail "Failed to mount loop fs."
175 _test_enospc $LOOP_MNT
176 _test_edquot $LOOP_MNT
180 echo $orig_sp_time > /proc/sys/fs/xfs/speculative_prealloc_lifetime