[PATCH 2/3] xfs: fix quota tests to adapt to realtime quota

Darrick J. Wong
2025-01-16T23:40:17Z

Fix or limit the scope of tests so that we can turn on testing for
realtime quotas.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
common/quota | 25 +++++++++++++++++++++++++
tests/generic/219 | 1 +
tests/generic/230 | 1 +
tests/generic/305 | 1 +
tests/generic/326 | 1 +
tests/generic/327 | 1 +
tests/generic/328 | 1 +
tests/generic/566 | 4 +++-
tests/generic/587 | 1 +
tests/generic/603 | 1 +
tests/generic/691 | 2 ++
tests/generic/710 | 4 +++-
tests/xfs/050 | 2 ++
tests/xfs/096 | 4 ++++
tests/xfs/106 | 1 +
tests/xfs/108 | 2 ++
tests/xfs/152 | 1 +
tests/xfs/153 | 2 ++
tests/xfs/161 | 1 +
tests/xfs/213 | 1 +
tests/xfs/214 | 1 +
tests/xfs/220 | 2 ++
tests/xfs/299 | 2 ++
tests/xfs/330 | 1 +
tests/xfs/434 | 1 +
tests/xfs/435 | 1 +
tests/xfs/440 | 3 +++
tests/xfs/441 | 1 +
tests/xfs/442 | 1 +
tests/xfs/508 | 2 ++
tests/xfs/511 | 10 +++++++++-
tests/xfs/720 | 5 +++++
32 files changed, 84 insertions(+), 3 deletions(-)

diff --git a/common/quota b/common/quota
index 6735d0fec48991..2f5ccd2fa17363 100644
--- a/common/quota
+++ b/common/quota
@@ -436,5 +436,30 @@ _restore_project_quota()
sed -i "/:$id$/d" /etc/projid
}

+# Reconfigure the mounted fs as needed so that we can test the VFS quota
+# utilities. They do not support realtime block limits or reporting, so
+# we forcibly inhibit rtinherit on XFS filesystems.
+_force_vfs_quota_testing()
+{
+ local mount="${1:-$TEST_DIR}"
+
+ test "$FSTYP" = "xfs" && _xfs_force_bdev data "$mount"
+}
+
+# Does the mounted scratch filesystem have a realtime volume where quota works?
+# Returns nonzero if any of the above are false.
+_scratch_supports_rtquota()
+{
+ case "$FSTYP" in
+ "xfs")
+ if [ "$USE_EXTERNAL" = yes ] && [ -n "$SCRATCH_RTDEV" ]; then
+ _xfs_scratch_supports_rtquota
+ return
+ fi
+ esac
+
+ return 1
+}
+
# make sure this script returns success
/bin/true
diff --git a/tests/generic/219 b/tests/generic/219
index d72aa745fdfcf1..cc2ec119eb4298 100755
--- a/tests/generic/219
+++ b/tests/generic/219
@@ -92,6 +92,7 @@ test_accounting()
_scratch_unmount 2>/dev/null
_scratch_mkfs >> $seqres.full 2>&1
_scratch_mount "-o usrquota,grpquota"
+_force_vfs_quota_testing $SCRATCH_MNT
quotacheck -u -g $SCRATCH_MNT 2>/dev/null
quotaon $SCRATCH_MNT 2>/dev/null
_scratch_unmount
diff --git a/tests/generic/230 b/tests/generic/230
index 18e20f4b2e9439..a8caf5a808c3c7 100755
--- a/tests/generic/230
+++ b/tests/generic/230
@@ -100,6 +100,7 @@ _qmount_option 'defaults'

_scratch_mkfs >> $seqres.full 2>&1
_scratch_mount "-o usrquota,grpquota"
+_force_vfs_quota_testing $SCRATCH_MNT
BLOCK_SIZE=$(_get_file_block_size $SCRATCH_MNT)
quotacheck -u -g $SCRATCH_MNT 2>/dev/null
quotaon $SCRATCH_MNT 2>/dev/null
diff --git a/tests/generic/305 b/tests/generic/305
index 6ccbb3d07c70c2..373abf57037ed6 100755
--- a/tests/generic/305
+++ b/tests/generic/305
@@ -26,6 +26,7 @@ echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
export MOUNT_OPTIONS="-o usrquota,grpquota $MOUNT_OPTIONS"
_scratch_mount >> $seqres.full 2>&1
+_force_vfs_quota_testing $SCRATCH_MNT
quotacheck -u -g $SCRATCH_MNT 2> /dev/null
quotaon $SCRATCH_MNT 2> /dev/null

diff --git a/tests/generic/326 b/tests/generic/326
index 321e7dc6a8e54c..d16e95aabaecd5 100755
--- a/tests/generic/326
+++ b/tests/generic/326
@@ -27,6 +27,7 @@ echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
export MOUNT_OPTIONS="-o usrquota,grpquota $MOUNT_OPTIONS"
_scratch_mount >> $seqres.full 2>&1
+_force_vfs_quota_testing $SCRATCH_MNT
quotacheck -u -g $SCRATCH_MNT 2> /dev/null
quotaon $SCRATCH_MNT 2> /dev/null

diff --git a/tests/generic/327 b/tests/generic/327
index 18cfcd1f655bd7..9102cbd6841072 100755
--- a/tests/generic/327
+++ b/tests/generic/327
@@ -25,6 +25,7 @@ echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
export MOUNT_OPTIONS="-o usrquota,grpquota $MOUNT_OPTIONS"
_scratch_mount >> $seqres.full 2>&1
+_force_vfs_quota_testing $SCRATCH_MNT
quotacheck -u -g $SCRATCH_MNT 2> /dev/null
quotaon $SCRATCH_MNT 2> /dev/null

diff --git a/tests/generic/328 b/tests/generic/328
index fa33bdb78dba12..db785475db87d6 100755
--- a/tests/generic/328
+++ b/tests/generic/328
@@ -26,6 +26,7 @@ echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
export MOUNT_OPTIONS="-o usrquota,grpquota $MOUNT_OPTIONS"
_scratch_mount >> $seqres.full 2>&1
+_force_vfs_quota_testing $SCRATCH_MNT
quotacheck -u -g $SCRATCH_MNT 2> /dev/null
quotaon $SCRATCH_MNT 2> /dev/null

diff --git a/tests/generic/566 b/tests/generic/566
index a41e04852ed88c..a6ec82fd36d8bb 100755
--- a/tests/generic/566
+++ b/tests/generic/566
@@ -35,7 +35,9 @@ _qmount
dir="$SCRATCH_MNT/dummy"
mkdir -p $dir
chown $qa_user $dir
-$XFS_QUOTA_PROG -x -c "limit -g bsoft=100k bhard=100k $qa_user" $SCRATCH_MNT
+_scratch_supports_rtquota && \
+ extra_limits="rtbsoft=100k rtbhard=100k"
+$XFS_QUOTA_PROG -x -c "limit -g bsoft=100k bhard=100k $extra_limits $qa_user" $SCRATCH_MNT

$XFS_IO_PROG -f -c 'pwrite -S 0x58 0 1m' $dir/foo >> $seqres.full
chown $qa_user "${dir}/foo"
diff --git a/tests/generic/587 b/tests/generic/587
index 466596799431f7..49fcade72790d6 100755
--- a/tests/generic/587
+++ b/tests/generic/587
@@ -56,6 +56,7 @@ _scratch_mkfs > $seqres.full
# This test must have user quota enabled
_qmount_option usrquota
_qmount >> $seqres.full
+_force_vfs_quota_testing $SCRATCH_MNT

testfile=$SCRATCH_MNT/test-$seq
touch $testfile
diff --git a/tests/generic/603 b/tests/generic/603
index b199f801a8f03f..9b5e824577b382 100755
--- a/tests/generic/603
+++ b/tests/generic/603
@@ -120,6 +120,7 @@ _scratch_mkfs >$seqres.full 2>&1
_scratch_enable_pquota
_qmount_option "usrquota,grpquota,prjquota"
_qmount
+_force_vfs_quota_testing $SCRATCH_MNT
_require_prjquota $SCRATCH_DEV
BLOCK_SIZE=$(_get_file_block_size $SCRATCH_MNT)
rm -rf $SCRATCH_MNT/t
diff --git a/tests/generic/691 b/tests/generic/691
index 30ae4a1e384a05..fa682fb73b0417 100755
--- a/tests/generic/691
+++ b/tests/generic/691
@@ -39,6 +39,7 @@ _scratch_mkfs >$seqres.full 2>&1
_scratch_enable_pquota
_qmount_option "prjquota"
_qmount
+_force_vfs_quota_testing $SCRATCH_MNT
_require_prjquota $SCRATCH_DEV

filter_quota()
@@ -66,6 +67,7 @@ exercise()
_scratch_enable_pquota
fi
_qmount
+ _force_vfs_quota_testing $SCRATCH_MNT
if [ "$type" = "P" ];then
_create_project_quota $SCRATCH_MNT/t $projid $qa_user
file=$SCRATCH_MNT/t/testfile
diff --git a/tests/generic/710 b/tests/generic/710
index 072cddf570f444..16f7276d3d4b04 100755
--- a/tests/generic/710
+++ b/tests/generic/710
@@ -32,7 +32,9 @@ $XFS_IO_PROG -f -c 'pwrite -S 0x59 0 64k -b 64k' -c 'truncate 256k' $SCRATCH_MNT
chown nobody $SCRATCH_MNT/b

# Set up a quota limit
-$XFS_QUOTA_PROG -x -c "limit -u bhard=70k nobody" $SCRATCH_MNT
+_scratch_supports_rtquota && \
+ extra_limits="rtbhard=70k"
+$XFS_QUOTA_PROG -x -c "limit -u bhard=70k $extra_limits nobody" $SCRATCH_MNT

echo before exchangerange >> $seqres.full
$XFS_QUOTA_PROG -x -c 'report -a' $SCRATCH_MNT >> $seqres.full
diff --git a/tests/xfs/050 b/tests/xfs/050
index 1e40ab90a843e8..46c60a4bdd6b66 100755
--- a/tests/xfs/050
+++ b/tests/xfs/050
@@ -33,6 +33,7 @@ _scratch_mkfs >/dev/null 2>&1
orig_mntopts="$MOUNT_OPTIONS"
_qmount_option "uquota"
_scratch_mount
+_force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage
bsize=$(_get_file_block_size $SCRATCH_MNT)
# needs quota enabled to compute the number of metadata dir files
HIDDEN_QUOTA_FILES=$(_xfs_calc_hidden_quota_files $SCRATCH_MNT)
@@ -75,6 +76,7 @@ _exercise()
. $tmp.mkfs

_qmount
+ _force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage

# Figure out whether we're doing large allocations
# (bail out if they're so large they stuff the test up)
diff --git a/tests/xfs/096 b/tests/xfs/096
index f1f5d562d4fa18..4c4fdfa12ef840 100755
--- a/tests/xfs/096
+++ b/tests/xfs/096
@@ -20,6 +20,10 @@ _require_scratch
_require_xfs_quota
_require_xfs_nocrc

+if [ "$USE_EXTERNAL" = yes ] && [ -n "$SCRATCH_RTDEV" ]; then
+ _notrun "Realtime quotas not supported on V4 filesystems"
+fi
+
function option_string()
{
VAL=$1
diff --git a/tests/xfs/106 b/tests/xfs/106
index 10cbd1052bbc89..108cd0b8c3061a 100755
--- a/tests/xfs/106
+++ b/tests/xfs/106
@@ -195,6 +195,7 @@ test_xfs_quota()
{
_qmount_option $1
_qmount
+ _force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage

if [ $type == "p" ]; then
_require_prjquota $SCRATCH_DEV
diff --git a/tests/xfs/108 b/tests/xfs/108
index 149d76eeb17a42..8adc63d4e56e4f 100755
--- a/tests/xfs/108
+++ b/tests/xfs/108
@@ -63,6 +63,7 @@ test_accounting()
export MOUNT_OPTIONS="-opquota"
_scratch_mkfs_xfs >> $seqres.full
_qmount
+_force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage
_require_prjquota $SCRATCH_DEV

rm -f $tmp.projects $seqres.full
@@ -70,6 +71,7 @@ _scratch_unmount 2>/dev/null
_scratch_mkfs_xfs | _filter_mkfs 2>$tmp.mkfs
cat $tmp.mkfs >>$seqres.full
_scratch_mount
+_force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage

uid=1
gid=2
diff --git a/tests/xfs/152 b/tests/xfs/152
index 94428b35d22a87..7ba00c4bfac9ff 100755
--- a/tests/xfs/152
+++ b/tests/xfs/152
@@ -240,6 +240,7 @@ qmount_idmapped()
{
wipe_mounts
_try_scratch_mount || _fail "qmount failed"
+ _force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage

mkdir -p "${SCRATCH_MNT}/unmapped"
mkdir -p "${SCRATCH_MNT}/idmapped"
diff --git a/tests/xfs/153 b/tests/xfs/153
index 2ce22b8c44b298..27db71e7738d08 100755
--- a/tests/xfs/153
+++ b/tests/xfs/153
@@ -38,6 +38,7 @@ _scratch_mkfs >/dev/null 2>&1
orig_mntopts="$MOUNT_OPTIONS"
_qmount_option "uquota"
_scratch_mount
+_force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage
bsize=$(_get_file_block_size $SCRATCH_MNT)
# needs quota enabled to compute the number of metadata dir files
HIDDEN_QUOTA_FILES=$(_xfs_calc_hidden_quota_files $SCRATCH_MNT)
@@ -80,6 +81,7 @@ run_tests()
. $tmp.mkfs

_qmount
+ _force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage

# Figure out whether we're doing large allocations
# (bail out if they're so large they stuff the test up)
diff --git a/tests/xfs/161 b/tests/xfs/161
index e13a646a5053bd..c35bcabb5eda90 100755
--- a/tests/xfs/161
+++ b/tests/xfs/161
@@ -36,6 +36,7 @@ _qmount_option "usrquota"
_scratch_xfs_db -c 'version' -c 'sb 0' -c 'p' >> $seqres.full
_scratch_mount >> $seqres.full

+_xfs_force_bdev data $SCRATCH_MNT

min_blksz=65536
file_blksz=$(_get_file_block_size "$SCRATCH_MNT")
diff --git a/tests/xfs/213 b/tests/xfs/213
index 7b27e3c09a815a..a9e97ee01cabce 100755
--- a/tests/xfs/213
+++ b/tests/xfs/213
@@ -28,6 +28,7 @@ echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
export MOUNT_OPTIONS="-o usrquota,grpquota $MOUNT_OPTIONS"
_scratch_mount >> $seqres.full 2>&1
+_force_vfs_quota_testing $SCRATCH_MNT # repquota
quotacheck -u -g $SCRATCH_MNT 2> /dev/null
quotaon $SCRATCH_MNT 2> /dev/null

diff --git a/tests/xfs/214 b/tests/xfs/214
index f2f23b3fb33f5d..c316a92baa4404 100755
--- a/tests/xfs/214
+++ b/tests/xfs/214
@@ -29,6 +29,7 @@ echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
export MOUNT_OPTIONS="-o usrquota,grpquota $MOUNT_OPTIONS"
_scratch_mount >> $seqres.full 2>&1
+_force_vfs_quota_testing $SCRATCH_MNT # repquota
quotacheck -u -g $SCRATCH_MNT 2> /dev/null
quotaon $SCRATCH_MNT 2> /dev/null

diff --git a/tests/xfs/220 b/tests/xfs/220
index f89c976fb850af..d34764301b9e06 100755
--- a/tests/xfs/220
+++ b/tests/xfs/220
@@ -37,6 +37,7 @@ _scratch_mkfs_xfs >/dev/null 2>&1

# mount with quotas enabled
_scratch_mount -o uquota
+_force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage

# turn off quota
$XFS_QUOTA_PROG -x -c off $SCRATCH_DEV
@@ -49,6 +50,7 @@ _scratch_mkfs_xfs >/dev/null 2>&1

# mount with quotas enabled
_scratch_mount -o uquota
+_force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage

# turn off quota accounting...
$XFS_QUOTA_PROG -x -c off $SCRATCH_DEV
diff --git a/tests/xfs/299 b/tests/xfs/299
index 3986f8fb904e5d..9f8b6631ccabfb 100755
--- a/tests/xfs/299
+++ b/tests/xfs/299
@@ -153,6 +153,7 @@ projid_file="$tmp.projid"
echo "*** user, group, and project"
_qmount_option "uquota,gquota,pquota"
_qmount
+_force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage

bsize=$(_get_file_block_size $SCRATCH_MNT)
HIDDEN_QUOTA_FILES=$(_xfs_calc_hidden_quota_files $SCRATCH_MNT)
@@ -180,6 +181,7 @@ cat $tmp.mkfs >>$seqres.full
echo "*** uqnoenforce, gqnoenforce, and pqnoenforce"
_qmount_option "uqnoenforce,gqnoenforce,pqnoenforce"
_qmount
+_force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage
_exercise uno
_exercise gno
_exercise pno
diff --git a/tests/xfs/330 b/tests/xfs/330
index 30c09ff5906e12..ca74929b1d26fc 100755
--- a/tests/xfs/330
+++ b/tests/xfs/330
@@ -36,6 +36,7 @@ echo "Format and mount"
_scratch_mkfs > "$seqres.full" 2>&1
export MOUNT_OPTIONS="-o usrquota,grpquota $MOUNT_OPTIONS"
_scratch_mount >> "$seqres.full" 2>&1
+_force_vfs_quota_testing $SCRATCH_MNT # golden output encodes block usage
HIDDEN_QUOTA_FILES=$(_xfs_calc_hidden_quota_files $SCRATCH_MNT)
quotacheck -u -g $SCRATCH_MNT 2> /dev/null
quotaon $SCRATCH_MNT 2> /dev/null
diff --git a/tests/xfs/434 b/tests/xfs/434
index fe609b138d732b..2dec1b084e0801 100755
--- a/tests/xfs/434
+++ b/tests/xfs/434
@@ -44,6 +44,7 @@ _scratch_mount -o noquota >> "$seqres.full" 2>&1

testdir="$SCRATCH_MNT/test-$seq"
blksz=65536
+_require_congruent_file_oplen $SCRATCH_MNT $blksz
blks=3
mkdir "$testdir"

diff --git a/tests/xfs/435 b/tests/xfs/435
index 22c02fbd1289bb..c1d6a40e00fc1f 100755
--- a/tests/xfs/435
+++ b/tests/xfs/435
@@ -35,6 +35,7 @@ _scratch_mount -o quota >> "$seqres.full" 2>&1

testdir="$SCRATCH_MNT/test-$seq"
blksz=65536
+_require_congruent_file_oplen $SCRATCH_MNT $blksz
blks=3
mkdir "$testdir"

diff --git a/tests/xfs/440 b/tests/xfs/440
index c0b6756ba97665..8c283fd28bbf9e 100755
--- a/tests/xfs/440
+++ b/tests/xfs/440
@@ -32,6 +32,9 @@ echo "Format and mount"
_scratch_mkfs > "$seqres.full" 2>&1
_scratch_mount "-o usrquota,grpquota" >> "$seqres.full" 2>&1

+# Make sure all our files are on the data device
+_xfs_force_bdev data $SCRATCH_MNT
+
echo "Create files"
$XFS_IO_PROG -c "cowextsize 1m" $SCRATCH_MNT
touch $SCRATCH_MNT/a $SCRATCH_MNT/force_fsgqa
diff --git a/tests/xfs/441 b/tests/xfs/441
index ca3c576ad9cc66..a64da1d815047b 100755
--- a/tests/xfs/441
+++ b/tests/xfs/441
@@ -31,6 +31,7 @@ check_quota() {
echo "Format and mount (noquota)"
_scratch_mkfs > "$seqres.full" 2>&1
_scratch_mount "-o noquota" >> $seqres.full 2>&1
+_force_vfs_quota_testing $SCRATCH_MNT # _check_quota_usage uses repquota

echo "Create files"
_pwrite_byte 0x58 0 1m $SCRATCH_MNT/a >> $seqres.full
diff --git a/tests/xfs/442 b/tests/xfs/442
index 08f0aac40433ee..9bb055ce4d02de 100755
--- a/tests/xfs/442
+++ b/tests/xfs/442
@@ -60,6 +60,7 @@ _qmount_option "usrquota,grpquota,prjquota"
# tests now have separate faster-running regression tests.
_scratch_mkfs_sized $((1600 * 1048576)) > $seqres.full 2>&1
_scratch_mount >> $seqres.full 2>&1
+_force_vfs_quota_testing $SCRATCH_MNT # _check_quota_usage uses repquota

nr_cpus=$((LOAD_FACTOR * 4))
nr_ops=$((25000 * TIME_FACTOR))
diff --git a/tests/xfs/508 b/tests/xfs/508
index 1bd13e98c9f641..df38dd3fbd50e4 100755
--- a/tests/xfs/508
+++ b/tests/xfs/508
@@ -57,6 +57,8 @@ _require_prjquota $SCRATCH_DEV
mkdir $SCRATCH_MNT/dir
$QUOTA_CMD -x -c 'project -s test' $SCRATCH_MNT >>$seqres.full 2>&1
$QUOTA_CMD -x -c 'limit -p bsoft=10m bhard=20m test' $SCRATCH_MNT
+_scratch_supports_rtquota && \
+ $QUOTA_CMD -x -c 'limit -p rtbsoft=10m rtbhard=20m test' $SCRATCH_MNT

# test the Project inheritance bit is a directory only flag, and it's set on
# directory by default. Expect no complain about "project inheritance flag is
diff --git a/tests/xfs/511 b/tests/xfs/511
index a942e92e3af32d..0c7e137203ddb7 100755
--- a/tests/xfs/511
+++ b/tests/xfs/511
@@ -38,11 +38,19 @@ $XFS_IO_PROG -f -c "pwrite 0 65536" -c syncfs $SCRATCH_MNT/t/file >>$seqres.full
quota_cmd="$XFS_QUOTA_PROG -x"
$quota_cmd -c "project -s -p $SCRATCH_MNT/t 42" $SCRATCH_MNT >/dev/null 2>&1
$quota_cmd -c 'limit -p isoft=53 bsoft=100m 42' $SCRATCH_MNT
+_scratch_supports_rtquota && \
+ $quota_cmd -c 'limit -p rtbsoft=100m 42' $SCRATCH_MNT
+
+# The golden output for this test was written with the assumption that the file
+# allocation unit divides 64k evenly, so the file block usage would be exactly
+# 64k. On realtime filesystems this isn't always true (e.g. -rextsize=28k) so
+# we'll accept the space usage being the same as what du reports for the file.
+file_nblocks=$(du -B 1024 $SCRATCH_MNT/t/file | awk '{print $1}')

# The itotal and size should be 53 and 102400(k), as above project quota limit.
# The isued and used should be 2 and 64(k), as this case takes.
df -k --output=file,itotal,iused,size,used $SCRATCH_MNT/t | \
- _filter_scratch | _filter_spaces
+ _filter_scratch | _filter_spaces | sed -e "s|$file_nblocks$|64|"

# success, all done
status=0
diff --git a/tests/xfs/720 b/tests/xfs/720
index 97b3d2579cbd7f..565373bef71e88 100755
--- a/tests/xfs/720
+++ b/tests/xfs/720
@@ -30,6 +30,11 @@ _scratch_mkfs > "$seqres.full" 2>&1
_qmount_option usrquota
_qmount

+# This test tries to exceed quota limits by creating an N>2 block bmbt, setting
+# the block limit to 2N, and rebuilding the bmbt. Hence we must force the
+# files to be created on the data device.
+_xfs_force_bdev data $SCRATCH_MNT
+
blocksize=$(_get_block_size $SCRATCH_MNT)
alloc_unit=$(_get_file_block_size $SCRATCH_MNT)