mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Dave Chinner
9816be53e5
When a large IO is done as a single buffer, there is no guarantee that it will partially succeed when close to ENOSPC. The test assumes that the kernel is going to break the write down into smaller chunks (i.e. buffered IO breaking it down into PAGE_SIZE allocations), but certain configurations will not do this. e.g. extent size hints are set or DAX is being used) and hence the large write fails completely as there is not space for the entire allocation to be made. Hence break the final write in the test up into multiple small writes, thereby acheiving the same effect - ensuring that we can write more data after removing some space.... Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
98 lines
2.9 KiB
Bash
Executable File
98 lines
2.9 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 275
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#
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# The posix write test. When write size is larger than disk free size,
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# should write as much as possible until ENOSPC.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2011-2012 Fujitsu, 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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#
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#creator
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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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_scratch_unmount
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}
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. ./common/rc
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. ./common/filter
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# real QA test starts here
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_supported_fs generic
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_supported_os IRIX Linux
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_require_scratch
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echo "------------------------------"
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echo "write until ENOSPC test"
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echo "------------------------------"
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rm -f $seqres.full
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umount $SCRATCH_DEV 2>/dev/null
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_scratch_mkfs_sized $((2 * 1024 * 1024 * 1024)) >>$seqres.full 2>&1
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_scratch_mount
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# this file will get removed to create 256k of free space after ENOSPC
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# conditions are created.
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dd if=/dev/zero of=$SCRATCH_MNT/tmp1 bs=256K count=1 >>$seqres.full 2>&1
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[ $? -ne 0 ] && _fail "Error creating file"
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# Attempt to completely fill fs
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dd if=/dev/zero of=$SCRATCH_MNT/tmp2 bs=1M >>$seqres.full 2>&1
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sync
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dd if=/dev/zero of=$SCRATCH_MNT/tmp3 bs=4K >>$seqres.full 2>&1
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sync
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# Last effort, use O_SYNC
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dd if=/dev/zero of=$SCRATCH_MNT/tmp4 bs=4K oflag=sync >>$seqres.full 2>&1
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# Save space usage info to the full file
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echo "Pre rm space:" >> $seqres.full
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$DF_PROG $SCRATCH_MNT >>$seqres.full 2>&1
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# Should leave approx 256k free
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rm -f $SCRATCH_MNT/tmp1
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sync
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echo "Post rm space:" >> $seqres.full
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$DF_PROG $SCRATCH_MNT >>$seqres.full 2>&1
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_freespace=`$DF_PROG -k $SCRATCH_MNT | tail -n 1 | awk '{print $5}'`
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[ $_freespace -gt 1024 ] && _fail "could not sufficiently fill filesystem"
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# Try to write more than available space in chunks that will allow at least one
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# full write to succeed.
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dd if=/dev/zero of=$SCRATCH_MNT/tmp1 bs=128k count=8 >>$seqres.full 2>&1
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echo "Bytes written until ENOSPC:" >>$seqres.full
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du $SCRATCH_MNT/tmp1 >>$seqres.full
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# And at least some of it should succeed.
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_filesize=`ls -l $SCRATCH_MNT/tmp1 | awk '{print $5}'`
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[ $_filesize -lt $((128 * 1024)) ] && \
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_fail "Partial write until enospc failed; wrote $_filesize bytes."
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echo "done"
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status=0
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exit
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