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ext4: Test for s_inodes_count overflow during fs resize
Test for overflow of s_inodes_count during filesystem resizing. Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Jan Kara
Eryu Guan
Executable
+123
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#! /bin/bash
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# FS QA Test 033
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#
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# Test s_inodes_count overflow for huge filesystems. This bug was fixed
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# by commit "ext4: Forbid overflowing inode count when resizing".
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2018 Jan Kara, SUSE. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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umount $SCRATCH_MNT >/dev/null 2>&1
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_dmhugedisk_cleanup
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cd /
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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. ./common/dmhugedisk
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs ext4
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_supported_os Linux
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_require_scratch_nocheck
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_require_dmhugedisk
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_require_dumpe2fs
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_require_command "$RESIZE2FS_PROG" resize2fs
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# Figure out whether device is large enough
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devsize=$(blockdev --getsize64 $SCRATCH_DEV)
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if [ $devsize -lt 4294967296 ]; then
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_notrun "Too small scratch device, need at least 4G"
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fi
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# Figure out block size
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echo "Figure out block size"
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_scratch_mkfs >/dev/null 2>&1
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_scratch_mount >> $seqres.full
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blksz="$(_get_block_size $SCRATCH_MNT)"
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_scratch_unmount
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inodes_per_group=$((blksz*8))
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group_blocks=$((blksz*8))
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# Number of groups to overflow s_inodes_count
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limit_groups=$(((1<<32)/inodes_per_group))
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# Create device huge enough so that overflowing inode count is possible.
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# Set chunk size to 16 sectors. Group descriptors with META_BG feature
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# are rather sparse and that leads to huge overallocation especially with
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# 1k blocksize.
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echo "Format huge device"
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_dmhugedisk_init $(((limit_groups + 16)*group_blocks*(blksz/512))) 16
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# Start with small fs
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group_count=$((limit_groups - 16))
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_mkfs_dev -N $((group_count*inodes_per_group)) -b $blksz \
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$DMHUGEDISK_DEV $((group_count*group_blocks))
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_mount $DMHUGEDISK_DEV $SCRATCH_MNT
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echo "Initial fs dump" >> $seqres.full
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$DUMPE2FS_PROG -h $DMHUGEDISK_DEV >> $seqres.full 2>&1
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# This should fail, s_inodes_count would just overflow!
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echo "Resizing to inode limit + 1..."
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$RESIZE2FS_PROG $DMHUGEDISK_DEV $((limit_groups*group_blocks)) >> $seqres.full 2>&1
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if [ $? -eq 0 ]; then
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echo "Resizing succeeded but it should fail!"
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exit
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fi
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# This should succeed, we are maxing out inodes
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echo "Resizing to max group count..."
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$RESIZE2FS_PROG $DMHUGEDISK_DEV $(((limit_groups-1)*group_blocks)) >> $seqres.full 2>&1
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if [ $? -ne 0 ]; then
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echo "Resizing failed!"
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exit
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fi
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echo "Fs dump after resize" >> $seqres.full
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$DUMPE2FS_PROG -h $DMHUGEDISK_DEV >> $seqres.full 2>&1
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# This should fail, s_inodes_count would overflow by quite a bit!
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echo "Resizing to device size..."
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$RESIZE2FS_PROG $DMHUGEDISK_DEV >> $seqres.full 2>&1
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if [ $? -eq 0 ]; then
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echo "Resizing succeeded but it should fail!"
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exit
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fi
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# success, all done
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status=0
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exit
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@@ -0,0 +1,6 @@
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QA output created by 033
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Figure out block size
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Format huge device
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Resizing to inode limit + 1...
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Resizing to max group count...
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Resizing to device size...
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@@ -35,6 +35,7 @@
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030 auto quick dax
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031 auto quick dax
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032 auto quick ioctl resize
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033 auto ioctl resize
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271 auto rw quick
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301 aio auto ioctl rw stress defrag
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302 aio auto ioctl rw stress defrag
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