This is to test if COW enabled btrfs can end up with single 4k extents when doing subpagesize buffered writes.
Signed-off-by: Liu Bo <bo.li....@oracle.com> --- tests/btrfs/027 | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/027.out | 2 ++ tests/btrfs/group | 1 + 3 files changed, 97 insertions(+) create mode 100755 tests/btrfs/027 create mode 100644 tests/btrfs/027.out diff --git a/tests/btrfs/027 b/tests/btrfs/027 new file mode 100755 index 0000000..37a9920 --- /dev/null +++ b/tests/btrfs/027 @@ -0,0 +1,94 @@ +#! /bin/bash +# FS QA Test 027 +# +# When btrfs is using cow mode, buffered writes of sub-pagesize can end up with +# single 4k extents. +# +#----------------------------------------------------------------------- +# Copyright (c) 2016 Liu Bo. All Rights Reserved. +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it would be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write the Free Software Foundation, +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +#----------------------------------------------------------------------- +# + +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" + +here=`pwd` +tmp=/tmp/$$ +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + cd / + rm -f $tmp.* + + # restore expire + echo $default_expire > /proc/sys/vm/dirty_expire_centisecs +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter + +# remove previous $seqres.full before test +rm -f $seqres.full + +# real QA test starts here + +# Modify as appropriate. +_supported_fs btrfs +_supported_os Linux +_require_scratch +_require_xfs_io_command "fiemap" + +_scratch_mkfs >> $seqres.full 2>&1 +_scratch_mount + +default_expire=`cat /proc/sys/vm/dirty_expire_centisecs` +echo 50 > /proc/sys/vm/dirty_expire_centisecs +tfile=$SCRATCH_MNT/testfile + +PAGE_SIZE=$(get_page_size) +SUBLEN=$((RANDOM % PAGE_SIZE)) + +$XFS_IO_PROG -f -c "pwrite 0 $PAGE_SIZE" $tfile > /dev/null 2>&1 +$XFS_IO_PROG -c "pwrite $PAGE_SIZE $SUBLEN" $tfile > /dev/null 2>&1 + +toff=$((PAGE_SIZE + SUBLEN)) +for ((i=0; i<10000; i++)) +do + tlen=$PAGE_SIZE + if [ $((i % 2)) = 0 ]; then + tlen=$((PAGE_SIZE * 3)) + fi + if [ $((i % 1000)) = 0 ]; then + tlen=$((RANDOM % PAGE_SIZE)) + fi + + $XFS_IO_PROG -c "pwrite $toff $tlen" $tfile > /dev/null 2>&1 + toff=$((toff + tlen)) +done + +sync + +# check for single PAGESIZE extent +$XFS_IO_PROG -c "fiemap -v" $tfile >> $seqres.full 2>&1 +$XFS_IO_PROG -c "fiemap -v" $tfile | awk '{if ($4 == 8) print $4}' + +# success, all done +status=0 +exit diff --git a/tests/btrfs/027.out b/tests/btrfs/027.out new file mode 100644 index 0000000..6050bdc --- /dev/null +++ b/tests/btrfs/027.out @@ -0,0 +1,2 @@ +QA output created by 027 +8 diff --git a/tests/btrfs/group b/tests/btrfs/group index a2fa412..f06d5fe 100644 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -29,6 +29,7 @@ 024 auto quick compress 025 auto quick send clone 026 auto quick compress prealloc +027 auto 029 auto quick clone 030 auto quick send 031 auto quick subvol clone -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html