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xfs/294: calculate space to reserve for fragmentation test

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This test requires us to fragment free space, and in part accomplishes
this by fallocating 400M of a 512M filesystem, then fallocating another
70M, and then using dd to eat remaining space.  However, it's risky to
assume the 400M figure because new features such as reflink and rmap
have per-ag metadata reservations which add to overhead.  Therefore,
reserve the 70M fragment file first, then try to fallocate 95% of the
remaining free space.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Tested-by: Yang Xu<xuyang2018.jy@cn.fujitsu.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Darrick J. Wong
2019-05-07 09:57:09 -07:00
committed by Eryu Guan
parent 3f59415858
commit d123585ea0
1 changed files with 6 additions and 5 deletions
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tests/xfs/294
+6 -5
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@@ -70,15 +70,16 @@ for I in `seq 1 100`; do
touch $SCRATCH_MNT/testdir/12345678901234567890$I;
done
# Now completely fragment freespace.
# Consume most of it:
$XFS_IO_PROG -f -c "falloc 0 400m" $SCRATCH_MNT/fillfile ||
_fail "Could not allocate space"
# File to fragment:
$XFS_IO_PROG -f -c "falloc 0 70m" $SCRATCH_MNT/fragfile ||
_fail "Could not allocate space"
# Now completely fragment freespace.
# Consume most of it:
space=$(stat -f -c '%f * %S * 95 / 100' $SCRATCH_MNT | $BC_PROG)
$XFS_IO_PROG -f -c "falloc 0 $space" $SCRATCH_MNT/fillfile ||
_fail "Could not allocate space"
df -h $SCRATCH_MNT >> $seqres.full 2>&1
# Fill remaining space; let this run to failure