/dev/urandom is incompressible and, /dev/zero is highly compressible,
so both are less effective in testing the compress code logic in btrfs.
This patch introduces a text data generator
cat /dev/urandom | od
to populate the files where /dev/urandom is currently being used in the
btrfs test cases.
And updates the _populate_fs() with a new option -c, so to instruct
to use the compressible data to populate the file(s).
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
v2: Create a new function _ddt() to wrap up dd's text input feature
common/rc | 14 +++++++++++---
tests/btrfs/002 | 6 +++---
tests/btrfs/003 | 4 ++--
tests/btrfs/008 | 4 ++--
tests/btrfs/011 | 11 ++++-------
tests/btrfs/016 | 2 +-
tests/btrfs/022 | 6 ++----
tests/btrfs/027 | 9 +++------
8 files changed, 28 insertions(+), 28 deletions(-)
diff --git a/common/rc b/common/rc
index 862bc048de46..d7c45dda281d 100644
--- a/common/rc
+++ b/common/rc
@@ -2413,6 +2413,11 @@ _die()
exit 1
}
+_ddt()
+{
+ cat /dev/urandom | od | dd iflag=fullblock ${*}
+}
+
#takes files, randomdata
_nfiles()
{
@@ -2424,7 +2429,9 @@ _nfiles()
if [ $size -gt 0 ]; then
if [ "$2" == "false" ]; then
dd if=/dev/zero of=$file bs=1024 count=$size 2>&1 | _filter_dd
- else
+ elif [ "$2" == "comp" ]; then
+ _ddt of=$file bs=1024 count=$size 2>&1 | _filter_dd
+ else
dd if=/dev/urandom of=$file bs=1024 count=$size 2>&1 | _filter_dd
fi
fi
@@ -2468,10 +2475,10 @@ _populate_fs()
depth=2 # depth of tree from root to leaves
verbose=false
root=root # path of initial root of directory tree
- randomdata=false # -x data type urandom or zero
+ randomdata=false # -x data type urandom, zero or compressible
OPTIND=1
- while getopts "d:f:n:r:s:v:x" c
+ while getopts "d:f:n:r:s:v:x:c" c
do
case $c in
d) depth=$OPTARG;;
@@ -2481,6 +2488,7 @@ _populate_fs()
v) verbose=true;;
r) root=$OPTARG;;
x) randomdata=true;;
+ c) randomdata=comp;;
esac
done
diff --git a/tests/btrfs/002 b/tests/btrfs/002
index fce5d955dfa3..d672287328fc 100755
--- a/tests/btrfs/002
+++ b/tests/btrfs/002
@@ -92,7 +92,7 @@ _read_modify_write()
do
FSIZE=`stat -t $i | cut -d" " -f2`
dd if=$i of=/dev/null obs=$FSIZE count=1 status=noxfer 2>/dev/null &
- dd if=/dev/urandom of=$i obs=$FSIZE count=1 status=noxfer 2>/dev/null &
+ _ddt of=$i obs=$FSIZE count=1 status=noxfer 2>/dev/null &
done
wait $!
}
@@ -114,7 +114,7 @@ _fill_blk()
NBLK=`stat -c "%b" $i`
FALLOC=$(($BLKS * $NBLK))
WS=$(($FALLOC - $FSIZE))
- dd if=/dev/urandom of=$i oseek=$FSIZE obs=$WS count=1 status=noxfer 2>/dev/null &
+ _ddt of=$i oseek=$FSIZE obs=$WS count=1 status=noxfer 2>/dev/null &
done
wait $!
}
@@ -149,7 +149,7 @@ _append_file()
firstvol="$SCRATCH_MNT/sv1"
$BTRFS_UTIL_PROG subvolume create $firstvol > /dev/null || _fail "btrfs subvolume create $firstvol failed"
dirp=`mktemp -duq $firstvol/dir.XXXXXX`
-_populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10 -x
+_populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10 -c
SNAPNAME=0
_create_snap $firstvol
_save_checksum $firstvol $tmp.sv1.sum
diff --git a/tests/btrfs/003 b/tests/btrfs/003
index 51cff4644186..3ec3a2d9f998 100755
--- a/tests/btrfs/003
+++ b/tests/btrfs/003
@@ -62,7 +62,7 @@ _test_raid0()
_scratch_pool_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
_scratch_mount
dirp=`mktemp -duq $SCRATCH_MNT/dir.XXXXXX`
- _populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10
+ _populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10 -c
_scratch_unmount
}
@@ -72,7 +72,7 @@ _test_raid1()
_scratch_pool_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
_scratch_mount
dirp=`mktemp -duq $SCRATCH_MNT/dir.XXXXXX`
- _populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10
+ _populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10 -c
_scratch_unmount
}
diff --git a/tests/btrfs/008 b/tests/btrfs/008
index 019af0415d18..d08003ab8efc 100755
--- a/tests/btrfs/008
+++ b/tests/btrfs/008
@@ -69,8 +69,8 @@ work_dir="$TEST_DIR/$tmp_dir/send"
mkdir $work_dir/testdir
mkdir $work_dir/testdir/1/
mkdir $work_dir/testdir/2/
-dd if=/dev/urandom of=$work_dir/testdir/aa count=16 > /dev/null 2>&1
-dd if=/dev/urandom of=$work_dir/testdir/bb count=16 > /dev/null 2>&1
+_ddt of=$work_dir/testdir/aa count=16 > /dev/null 2>&1
+_ddt of=$work_dir/testdir/bb count=16 > /dev/null 2>&1
mkdir $work_dir/snapshots
$BTRFS_UTIL_PROG subvolume snapshot -r $work_dir $work_dir/snapshots/backup2 \
diff --git a/tests/btrfs/011 b/tests/btrfs/011
index 918742717528..28f138843bba 100755
--- a/tests/btrfs/011
+++ b/tests/btrfs/011
@@ -123,15 +123,12 @@ workout()
# 20K extents in the data chunk and fill up metadata with inline
# extents.
for i in `seq 1 500`; do
- dd if=/dev/urandom of=$SCRATCH_MNT/l$i bs=16385 count=1
- dd if=/dev/urandom of=$SCRATCH_MNT/s$i bs=3800 count=1
+ _ddt of=$SCRATCH_MNT/l$i bs=16385 count=1
+ _ddt of=$SCRATCH_MNT/s$i bs=3800 count=1
done > /dev/null 2>&1
- # /dev/urandom is slow but has the benefit that the generated
- # contents does not shrink during compression.
# Generate a template once and quickly copy it multiple times.
- # Obviously with online deduplication this will not work anymore.
- dd if=/dev/urandom of=$SCRATCH_MNT/t0 bs=1M count=1 > /dev/null 2>&1
+ _ddt of=$SCRATCH_MNT/t0 bs=1M count=1 > /dev/null 2>&1
if [ "${quick}Q" = "thoroughQ" ]; then
# The intention of this "thorough" test is to increase
@@ -220,7 +217,7 @@ btrfs_replace_test()
# generate some (slow) background traffic in parallel to the
# replace operation. It is not a problem if cat fails early
# with ENOSPC.
- cat /dev/urandom > $SCRATCH_MNT/noise 2>> $seqres.full &
+ cat /dev/urandom | od > $SCRATCH_MNT/noise 2>> $seqres.full &
noise_pid=$!
if [ "${with_cancel}Q" = "cancelQ" ]; then
diff --git a/tests/btrfs/016 b/tests/btrfs/016
index c8fc70892394..833246d304f6 100755
--- a/tests/btrfs/016
+++ b/tests/btrfs/016
@@ -66,7 +66,7 @@ mkdir $TEST_DIR/$tmp_dir
$BTRFS_UTIL_PROG subvolume create $TEST_DIR/$tmp_dir/send \
> $seqres.full 2>&1 || _fail "failed subvolume create"
-dd if=/dev/urandom of=$TEST_DIR/$tmp_dir/send/foo bs=1M count=10 >> $seqres.full \
+_ddt of=$TEST_DIR/$tmp_dir/send/foo bs=1M count=10 >> $seqres.full \
2>&1 || _fail "dd failed"
$BTRFS_UTIL_PROG subvolume snapshot -r $TEST_DIR/$tmp_dir/send \
$TEST_DIR/$tmp_dir/snap >> $seqres.full 2>&1 || _fail "failed snap"
diff --git a/tests/btrfs/022 b/tests/btrfs/022
index 9abad6c99099..b183f3db00b6 100755
--- a/tests/btrfs/022
+++ b/tests/btrfs/022
@@ -103,8 +103,7 @@ _limit_test_exceed()
_run_btrfs_util_prog quota enable $SCRATCH_MNT
subvolid=$(_btrfs_get_subvolid $SCRATCH_MNT a)
_run_btrfs_util_prog qgroup limit 5M 0/$subvolid $SCRATCH_MNT
- dd if=/dev/urandom of=$SCRATCH_MNT/a/file bs=10M count=1 >> \
- $seqres.full 2>&1
+ _ddt of=$SCRATCH_MNT/a/file bs=10M count=1 >> $seqres.full 2>&1
[ $? -ne 0 ] || _fail "quota should have limited us"
}
@@ -115,8 +114,7 @@ _limit_test_noexceed()
_run_btrfs_util_prog quota enable $SCRATCH_MNT
subvolid=$(_btrfs_get_subvolid $SCRATCH_MNT a)
_run_btrfs_util_prog qgroup limit 5M 0/$subvolid $SCRATCH_MNT
- dd if=/dev/urandom of=$SCRATCH_MNT/a/file bs=4M count=1 >> \
- $seqres.full 2>&1
+ _ddt of=$SCRATCH_MNT/a/file bs=4M count=1 >> $seqres.full 2>&1
[ $? -eq 0 ] || _fail "should have been allowed to write"
}
diff --git a/tests/btrfs/027 b/tests/btrfs/027
index 8cc2e8cb8264..46970a2918a7 100755
--- a/tests/btrfs/027
+++ b/tests/btrfs/027
@@ -81,12 +81,9 @@ run_test()
local missing_dev_id=`$BTRFS_UTIL_PROG fi show $SCRATCH_MNT | grep $missing_dev | awk '{print $2}'`
# get some data on the filesystem so there's something to replace
- dd if=/dev/urandom of="$SCRATCH_MNT"/file1 bs=1M count=1 \
- >>$seqres.full 2>&1
- dd if=/dev/urandom of="$SCRATCH_MNT"/file2 bs=1M count=2 \
- >>$seqres.full 2>&1
- dd if=/dev/urandom of="$SCRATCH_MNT"/file3 bs=1M count=4 \
- >>$seqres.full 2>&1
+ _ddt of="$SCRATCH_MNT"/file1 bs=1M count=1 >> $seqres.full 2>&1
+ _ddt of="$SCRATCH_MNT"/file2 bs=1M count=2 >> $seqres.full 2>&1
+ _ddt of="$SCRATCH_MNT"/file3 bs=1M count=4 >> $seqres.full 2>&1
# nuke a device and remount in degraded mode
_scratch_unmount
--
2.10.0
--
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