This tests is most similar to xfstests generic/405. It calls device mapper to create a thin provision device with small backing size and big virtual size. mkfs.btrfs should fail on such devices.
This test should pass after commit e805b143a4fe ("btrfs-progs: mkfs: return nozero value on thin provisioned device"). Signed-off-by: Su Yue <suy.f...@cn.fujitsu.com> --- changelog: v2: Fix a typo. Add prefixes of created devices to avoid collisions. Add quotes around the DMTHIN_* variables. Remove argument "$@" when mkfs.btrfs. --- .../test.sh | 93 +++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100755 tests/mkfs-tests/017-small-backing-size-thin-provision-device/test.sh diff --git a/tests/mkfs-tests/017-small-backing-size-thin-provision-device/test.sh b/tests/mkfs-tests/017-small-backing-size-thin-provision-device/test.sh new file mode 100755 index 000000000000..b55eb9f89fe1 --- /dev/null +++ b/tests/mkfs-tests/017-small-backing-size-thin-provision-device/test.sh @@ -0,0 +1,93 @@ +#!/bin/bash +# mkfs.btrfs must fail on a thin provision device with very small +# backing size and big virtual size. + +source "$TEST_TOP/common" + +check_prereq mkfs.btrfs + +setup_root_helper +prepare_test_dev + +# Backing data dev +DMTHIN_DATA_NAME="btrfs-progs-thin-data" +DMTHIN_DATA_DEV="/dev/mapper/$DMTHIN_DATA_NAME" +# Backing metadata dev +DMTHIN_META_NAME="btrfs-progs-thin-meta" +DMTHIN_META_DEV="/dev/mapper/$DMTHIN_META_NAME" +# Backing pool dev (combination of above) +DMTHIN_POOL_NAME="btrfs-progs-thin-pool" +DMTHIN_POOL_DEV="/dev/mapper/$DMTHIN_POOL_NAME" +# Thin volume +DMTHIN_VOL_NAME="btrfs-progs-thin-vol" +DMTHIN_VOL_DEV="/dev/mapper/$DMTHIN_VOL_NAME" + +dmthin_cleanup() +{ + # wait for device to be fully settled + run_check $SUDO_HELPER udevadm settle + run_check $SUDO_HELPER dmsetup remove "$DMTHIN_VOL_NAME" + run_check $SUDO_HELPER dmsetup remove "$DMTHIN_POOL_NAME" + run_check $SUDO_HELPER dmsetup remove "$DMTHIN_META_NAME" + run_check $SUDO_HELPER dmsetup remove "$DMTHIN_DATA_NAME" +} + +sector_size=512 # in bytes +data_dev_size=$((1 * 1024 * 1024 / $sector_size)) # 1M +virtual_size=$((1 * 1024 * 1024 * 1024 * 1024 / $sector_size)) # 1T +cluster_size=1024 # 512k in sectors +low_water=$((104857600 / $cluster_size/ $sector_size)) # 100M / $cluster_size, in sectors + +# Need to make linear metadata and data devs. From kernel docs: +# As a guide, we suggest you calculate the number of bytes to use in the +# metadata device as 48 * $data_dev_size / $data_block_size but round it up +# to 2MB (4096 sectors) if the answer is smaller. +# So do that: +meta_dev_size=$((48 * $data_dev_size / $cluster_size)) +if [ "$meta_dev_size" -lt "4096" ]; then + meta_dev_size=4096 # 2MB +fi + +meta_dev_offset=0 +total_data_dev_size=$(($meta_dev_offset + $meta_dev_size + $data_dev_size)) + +run_check truncate -s0 img +chmod a+w img +run_check truncate -s"$(($total_data_dev_size * $sector_size))" img + +dm_backing_dev=`run_check_stdout $SUDO_HELPER losetup --find --show img` + +# Metadata device +DMTHIN_META_TABLE="0 $meta_dev_size linear $dm_backing_dev $meta_dev_offset" +run_check $SUDO_HELPER dmsetup create "$DMTHIN_META_NAME" --table "$DMTHIN_META_TABLE" + +# Data device +data_dev_offset=$((meta_dev_offset + $meta_dev_size)) +DMTHIN_DATA_TABLE="0 $data_dev_size linear $dm_backing_dev $data_dev_offset" +run_check $SUDO_HELPER dmsetup create "$DMTHIN_DATA_NAME" --table "$DMTHIN_DATA_TABLE" + +# Zap the pool metadata dev +run_check dd if=/dev/zero of="$DMTHIN_META_DEV" bs=4096 count=1 + +# Thin pool +# "start length thin-pool metadata_dev data_dev data_block_size low_water_mark" +DMTHIN_POOL_TABLE="0 $data_dev_size thin-pool $DMTHIN_META_DEV $DMTHIN_DATA_DEV $cluster_size $low_water" +run_check $SUDO_HELPER dmsetup create "$DMTHIN_POOL_NAME" --table "$DMTHIN_POOL_TABLE" + +# Thin volume +pool_id=$RANDOM +run_check $SUDO_HELPER dmsetup message "$DMTHIN_POOL_DEV" 0 "create_thin $pool_id" + +# start length thin pool_dev dev_id [external_origin_dev] +DMTHIN_VOL_TABLE="0 $virtual_size thin $DMTHIN_POOL_DEV $pool_id" +run_check $SUDO_HELPER dmsetup create "$DMTHIN_VOL_NAME" --table "$DMTHIN_VOL_TABLE" + +# mkfs.btrfs should fail due to the small backing device +run_mustfail "should fail for small backing size thin provision device" \ + $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$DMTHIN_VOL_DEV" + +#cleanup +dmthin_cleanup +run_mayfail $SUDO_HELPER losetup -d "$dm_backing_dev" +run_check truncate -s0 img +rm img -- 2.17.0 -- 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