2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2009 Dave Chinner
7 # Test out ENOSPC flushing on small filesystems.
10 _begin_fstest metadata rw auto
12 # Import common functions.
15 # real QA test starts here
18 # single AG will cause xfs_repair to fail checks.
19 _require_scratch_nocheck
21 # Disable the scratch rt device to avoid test failures relating to the rt
22 # bitmap consuming all the free space in our small data device.
26 _scratch_mkfs_xfs -d size=$((32768*fsblksz)) -b size=$fsblksz >> $seqres.full 2>&1
29 # fix the reserve block pool to a known size so that the enospc calculations
31 _scratch_resvblks 1024 >> $seqres.full 2>&1
33 # on a 16MB filesystem, there's 32768x$fsblkszbyte blocks. used is:
35 # - 32+1 for the root inode cluster
36 # - 4 for the AG header
37 # - 2 for free space btrees
39 # - min(%5, 1024) = 1024 blocks for the reserve pool
40 # - about 15 blocks I can't account for right now.
41 # That leaves ~26,745 blocks free to use.
43 # Writing the following three files fill the fs almost exactly.
45 # $ df -k /mnt/scratch
46 # Filesystem 1K-blocks Used Available Use% Mounted on
47 # /dev/ubdc 13912 13908 4 100% /mnt/scratch
49 blks=$(( ($(_get_available_space $SCRATCH_MNT) / $fsblksz) - 15 ))
50 test $blks -gt 1100 || _notrun "not enough space"
51 b1=$(echo $blks | sed -e 's/[0-9][0-9][0-9]$/000/g')
52 # in case b2 begins with '0' as '098' and being treated as octal number, force
54 b2=$((10#$(echo $blks | sed -e 's/^[0-9][0-9]//g')))
55 echo "blks: $blks b1: $b1 b2: $b2" >> $seqres.full
56 dd if=/dev/zero of=$SCRATCH_MNT/fred bs=$fsblksz count=$((b1 - 1000)) 2>&1 | _filter_dd
57 dd if=/dev/zero of=$SCRATCH_MNT/fred2 bs=$fsblksz count=$b2 2>&1 | _filter_dd
58 dd if=/dev/zero of=$SCRATCH_MNT/fred3 bs=$fsblksz count=$((blks - (b1 + b2))) 2>&1 | _filter_dd
59 rm -f $SCRATCH_MNT/fred*
62 # now try a single file of that size
63 dd if=/dev/zero of=$SCRATCH_MNT/fred bs=$fsblksz count=$blks 2>&1 | _filter_dd
64 #rm -f $SCRATCH_MNT/fred*
66 echo "*** one file, a few bytes at a time"
67 # now try a single file of that size
68 dd if=/dev/zero of=$SCRATCH_MNT/fred bs=15 count=$[blks/15*$fsblksz] 2>&1 | _filter_dd
69 echo space: $(_get_available_space $SCRATCH_MNT) >> $seqres.full