| #! /bin/bash |
| # FS QA Test No. 033 |
| # |
| # This test stresses indirect block reservation for delayed allocation extents. |
| # XFS reserves extra blocks for deferred allocation of delalloc extents. These |
| # reserved blocks can be divided among more extents than anticipated if the |
| # original extent for which the blocks were reserved is split into multiple |
| # delalloc extents. If this scenario repeats, eventually some extents are left |
| # without any indirect block reservation whatsoever. This leads to assert |
| # failures and possibly other problems in XFS. |
| # |
| #----------------------------------------------------------------------- |
| # Copyright (c) 2014 Red Hat, Inc. All Rights Reserved. |
| # |
| # This program is free software; you can redistribute it and/or |
| # modify it under the terms of the GNU General Public License as |
| # published by the Free Software Foundation. |
| # |
| # This program is distributed in the hope that it would be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; if not, write the Free Software Foundation, |
| # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| #----------------------------------------------------------------------- |
| # |
| |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| here=`pwd` |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| cd / |
| rm -f $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| |
| # real QA test starts here |
| rm -f $seqres.full |
| |
| # Modify as appropriate. |
| _supported_fs generic |
| _supported_os Linux |
| _require_scratch |
| _require_xfs_io_command "fzero" |
| |
| _scratch_mkfs >/dev/null 2>&1 |
| _scratch_mount |
| |
| file=$SCRATCH_MNT/file.$seq |
| bytes=$((64 * 1024)) |
| |
| # create sequential delayed allocation |
| $XFS_IO_PROG -f -c "pwrite 0 $bytes" $file >> $seqres.full 2>&1 |
| |
| # Zero every other 4k range to split the larger delalloc extent into many more |
| # smaller extents. Use zero instead of hole punch because the former does not |
| # force writeback (and hence delalloc conversion). It can simply discard |
| # delalloc blocks and convert the ranges to unwritten. |
| endoff=$((bytes - 4096)) |
| for i in $(seq 0 8192 $endoff); do |
| $XFS_IO_PROG -c "fzero -k $i 4k" $file >> $seqres.full 2>&1 |
| done |
| |
| # now zero the opposite set to remove remaining delalloc extents |
| for i in $(seq 4096 8192 $endoff); do |
| $XFS_IO_PROG -c "fzero -k $i 4k" $file >> $seqres.full 2>&1 |
| done |
| |
| _scratch_cycle_mount |
| hexdump $file |
| |
| status=0 |
| exit |