99 lines
3.5 KiB
Bash
Executable File
99 lines
3.5 KiB
Bash
Executable File
#!/bin/bash
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# mkfs.btrfs must fail on a thin provision device with very small backing size
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# and big virtual size.
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source "$TEST_TOP/common" || exit
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check_prereq mkfs.btrfs
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check_global_prereq udevadm
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check_dm_target_support linear
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check_dm_target_support thin thin-pool
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setup_root_helper
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prepare_test_dev
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# Backing data dev
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DMTHIN_DATA_NAME="btrfs-progs-thin-data"
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DMTHIN_DATA_DEV="/dev/mapper/$DMTHIN_DATA_NAME"
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# Backing metadata dev
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DMTHIN_META_NAME="btrfs-progs-thin-meta"
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DMTHIN_META_DEV="/dev/mapper/$DMTHIN_META_NAME"
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# Backing pool dev (combination of above)
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DMTHIN_POOL_NAME="btrfs-progs-thin-pool"
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DMTHIN_POOL_DEV="/dev/mapper/$DMTHIN_POOL_NAME"
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# Thin volume
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DMTHIN_VOL_NAME="btrfs-progs-thin-vol"
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DMTHIN_VOL_DEV="/dev/mapper/$DMTHIN_VOL_NAME"
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dmthin_cleanup()
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{
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# wait for device to be fully settled
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run_check $SUDO_HELPER udevadm settle
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run_check $SUDO_HELPER dmsetup remove "$DMTHIN_VOL_NAME"
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run_check $SUDO_HELPER dmsetup remove "$DMTHIN_POOL_NAME"
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run_check $SUDO_HELPER dmsetup remove "$DMTHIN_META_NAME"
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run_check $SUDO_HELPER dmsetup remove "$DMTHIN_DATA_NAME"
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}
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sector_size=512 # in bytes
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data_dev_size=$((1 * 1024 * 1024 / $sector_size)) # 1M
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virtual_size=$((1 * 1024 * 1024 * 1024 * 1024 / $sector_size)) # 1T
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cluster_size=1024 # 512k in sectors
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low_water=$((104857600 / $cluster_size/ $sector_size)) # 100M / $cluster_size, in sectors
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# Need to make linear metadata and data devs. From kernel docs:
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# As a guide, we suggest you calculate the number of bytes to use in the
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# metadata device as 48 * $data_dev_size / $data_block_size but round it up
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# to 2MB (4096 sectors) if the answer is smaller.
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# So do that:
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meta_dev_size=$((48 * $data_dev_size / $cluster_size))
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if [ "$meta_dev_size" -lt "4096" ]; then
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meta_dev_size=4096 # 2MB
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fi
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meta_dev_offset=0
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total_data_dev_size=$(($meta_dev_offset + $meta_dev_size + $data_dev_size))
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_mktemp_local img
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run_check truncate -s"$(($total_data_dev_size * $sector_size))" img
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dm_backing_dev=`run_check_stdout $SUDO_HELPER losetup --find --show img`
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if ! [ -b "$dm_backing_dev" ]; then
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_fail "cannot create backing device"
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fi
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# Metadata device
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DMTHIN_META_TABLE="0 $meta_dev_size linear $dm_backing_dev $meta_dev_offset"
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run_check $SUDO_HELPER dmsetup create "$DMTHIN_META_NAME" --table "$DMTHIN_META_TABLE"
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# Data device
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data_dev_offset=$((meta_dev_offset + $meta_dev_size))
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DMTHIN_DATA_TABLE="0 $data_dev_size linear $dm_backing_dev $data_dev_offset"
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run_check $SUDO_HELPER dmsetup create "$DMTHIN_DATA_NAME" --table "$DMTHIN_DATA_TABLE"
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# Zap the pool metadata dev
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run_check $SUDO_HELPER dd if=/dev/zero of="$DMTHIN_META_DEV" bs=4096 count=1
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# Thin pool
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# "start length thin-pool metadata_dev data_dev data_block_size low_water_mark"
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DMTHIN_POOL_TABLE="0 $data_dev_size thin-pool $DMTHIN_META_DEV $DMTHIN_DATA_DEV $cluster_size $low_water"
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run_check $SUDO_HELPER dmsetup create "$DMTHIN_POOL_NAME" --table "$DMTHIN_POOL_TABLE"
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# Thin volume
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pool_id=$RANDOM
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run_check $SUDO_HELPER dmsetup message "$DMTHIN_POOL_DEV" 0 "create_thin $pool_id"
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# start length thin pool_dev dev_id [external_origin_dev]
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DMTHIN_VOL_TABLE="0 $virtual_size thin $DMTHIN_POOL_DEV $pool_id"
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run_check $SUDO_HELPER dmsetup create "$DMTHIN_VOL_NAME" --table "$DMTHIN_VOL_TABLE"
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# mkfs.btrfs should fail due to the small backing device, the initial discard
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# is disabled
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run_mustfail "should fail for small backing size thin provision device" \
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$SUDO_HELPER "$TOP/mkfs.btrfs" -K -f "$DMTHIN_VOL_DEV"
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dmthin_cleanup
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run_mayfail $SUDO_HELPER losetup -d "$dm_backing_dev"
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rm -- img
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