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Theodore Ts'o
76c21d6815
This makes it clear when we are using "mount ; umount" versus "mount
-o remount" for most file systems. The reason for this distinction is
(a) tests may want to test the difference between what happens on the
remount versus the munt paths, (b) with tmpfs, "mount ; umount" will
cause the contents of all of the files to disappear which makes many
tests sad, and (c) some mount options may not be changed using "mount
-o remount".
Currently _scratch_mount performs "_scratch_mount ; _scratch_umount"
so mechnically rename this function to _scratch_cycle_mount. This was
done mechnically using the script fragment:
git grep "_scratch_remount" | \
awk -F: '{print $1}' | sort -u | \
xargs sed -i 's/_scratch_remount/_scratch_cycle_mount/g'
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
85 lines
2.6 KiB
Bash
Executable File
85 lines
2.6 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 033
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#
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# This test stresses indirect block reservation for delayed allocation extents.
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# XFS reserves extra blocks for deferred allocation of delalloc extents. These
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# reserved blocks can be divided among more extents than anticipated if the
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# original extent for which the blocks were reserved is split into multiple
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# delalloc extents. If this scenario repeats, eventually some extents are left
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# without any indirect block reservation whatsoever. This leads to assert
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# failures and possibly other problems in XFS.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2014 Red Hat, Inc. 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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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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# real QA test starts here
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rm -f $seqres.full
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# Modify as appropriate.
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_supported_fs generic
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_supported_os Linux
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_require_scratch
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_require_xfs_io_command "fzero"
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_scratch_mkfs >/dev/null 2>&1
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_scratch_mount
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file=$SCRATCH_MNT/file.$seq
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bytes=$((64 * 1024))
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# create sequential delayed allocation
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$XFS_IO_PROG -f -c "pwrite 0 $bytes" $file >> $seqres.full 2>&1
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# Zero every other 4k range to split the larger delalloc extent into many more
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# smaller extents. Use zero instead of hole punch because the former does not
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# force writeback (and hence delalloc conversion). It can simply discard
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# delalloc blocks and convert the ranges to unwritten.
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endoff=$((bytes - 4096))
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for i in $(seq 0 8192 $endoff); do
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$XFS_IO_PROG -c "fzero -k $i 4k" $file >> $seqres.full 2>&1
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done
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# now zero the opposite set to remove remaining delalloc extents
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for i in $(seq 4096 8192 $endoff); do
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$XFS_IO_PROG -c "fzero -k $i 4k" $file >> $seqres.full 2>&1
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done
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_scratch_cycle_mount
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hexdump $file
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status=0
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exit
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