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 _begin_fstest auto enospc quick quota
17 # Import common functions.
21 # Override the default cleanup function.
25 umount $LOOP_MNT 2>/dev/null
26 _scratch_unmount 2>/dev/null
30 # Create a file using a repeated open, extending write and close pattern. This
31 # causes the preallocation to persist after the file is closed. Preallocation
32 # will not be reclaimed unless the inode is evicted or we hit an allocation
40 # a few file extending open-write-close cycles should be enough to
41 # trigger the fs to retain preallocation. write 256k in 32k intervals to
43 for i in $(seq 0 32768 262144); do
44 $XFS_IO_PROG -f -c "pwrite $i 32k" $file >> $seqres.full
47 # write a 4k aligned amount of data to keep the calculations simple
48 $XFS_IO_PROG -c "pwrite 0 128m" $file >> $seqres.full
50 size=`_get_filesize $file`
51 blocks=`stat -c "%b" $file`
52 blocksize=`stat -c "%B" $file`
54 prealloc_size=$((blocks * blocksize - size))
55 if [ $prealloc_size -eq 0 ]; then
56 echo "Warning: No speculative preallocation for $file." \
57 "Check use of the allocsize= mount option."
60 # keep a running total of how much preallocation we've created
61 TOTAL_PREALLOC=$((TOTAL_PREALLOC + prealloc_size))
68 # allocate all but 10MB of available space
69 freesp=`$DF_PROG -m $dir | $AWK_PROG '/^\// { print $5 - 10 }'`
70 $XFS_IO_PROG -f -c "falloc 0 ${freesp}M" $dir/spc
73 # Create several files with preallocation and consume the remaining free space
74 # via fallocate to the put the fs at ENOSPC. Create a set of background writers
75 # to write into ENOSPC and cause the preallocation to be reclaimed and
76 # reallocated to the new writers.
84 for i in $(seq 0 3); do
85 _spec_prealloc_file $dir/pre$i
88 _consume_free_space $dir
90 # consume 1/2 of the current preallocation across the set of 4 writers
91 write_size=$((TOTAL_PREALLOC / 2 / 4))
92 for i in $(seq 0 3); do
95 for i in $(seq 0 3); do
96 $XFS_IO_PROG -f -c "pwrite 0 $write_size" $dir/file.$i \
103 # Create preallocations accounted by both user and group quotas. Set the
104 # associated quota hard limits to put them at EDQUOT. Verify that a new writer
105 # reclaims the preallocated space and proceeds without error.
113 _spec_prealloc_file $dir/user
114 chown $qa_user $dir/user
116 _spec_prealloc_file $dir/group
117 chgrp $qa_group $dir/group
119 # writing to a file under both quotas means both will be reclaimed on
122 chown $qa_user $dir/file
123 chgrp $qa_group $dir/file
125 # put both quotas at EDQUOT
126 blks=`$XFS_QUOTA_PROG -xc "quota -u $qa_user" $dir | \
127 tail -n 1 | awk '{ print $2 }'`
128 $XFS_QUOTA_PROG -xc "limit -u bhard=${blks}k $qa_user" $dir
129 blks=`$XFS_QUOTA_PROG -xc "quota -g $qa_group" $dir | \
130 tail -n 1 | awk '{ print $2 }'`
131 $XFS_QUOTA_PROG -xc "limit -g bhard=${blks}k $qa_group" $dir
133 # each quota has a single file worth of preallocation to reclaim. leave
134 # some wiggle room and write to 1/3 the total.
135 write_size=$((TOTAL_PREALLOC / 3))
136 $XFS_IO_PROG -c "pwrite 0 $write_size" $dir/file >> $seqres.full
139 # real QA test starts here
143 _require_xfs_io_command "falloc"
149 echo "Silence is golden."
151 _scratch_mkfs_xfs >> $seqres.full 2>&1
154 # make sure the background eofblocks scanner doesn't interfere
155 orig_sp_time=`cat /proc/sys/fs/xfs/speculative_prealloc_lifetime`
156 echo 9999 > /proc/sys/fs/xfs/speculative_prealloc_lifetime
158 LOOP_FILE=$SCRATCH_MNT/$seq.fs
159 LOOP_MNT=$SCRATCH_MNT/$seq.mnt
161 $MKFS_XFS_PROG -d "file=1,name=$LOOP_FILE,size=10g" >> $seqres.full 2>&1
164 mount -t xfs -o loop,uquota,gquota $LOOP_FILE $LOOP_MNT || \
165 _fail "Failed to mount loop fs."
167 _test_enospc $LOOP_MNT
168 _test_edquot $LOOP_MNT
172 echo $orig_sp_time > /proc/sys/fs/xfs/speculative_prealloc_lifetime