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Failed creating env: Invalid argument: Malformed URI: zenfs://nullb0

I'm running db_bench on null_blk, changing DEV to nullb0 and running sudo ./run_zenfs.sh, but I got the error message Failed creating env: Invalid argument: Malformed URI: zenfs://nullb0.

Logs:

➜ chiro@chiro-pc  ~/fs/rocksdb git:(main) ✗ sudo ./run_zenfs.sh 
+ DEV=nullb0
+ FUZZ=5
++ cat /sys/class/block/nullb0/queue/chunk_sectors
+ ZONE_SZ_SECS=262144
+ ZONE_CAP=134217728
+ BASE_FZ=127506841
+ WB_SIZE=255013682
+ TARGET_FZ_BASE=255013682
+ TARGET_FILE_SIZE_MULTIPLIER=2
+ MAX_BYTES_FOR_LEVEL_BASE=510027364
+ MAX_BACKGROUND_JOBS=8
+ MAX_BACKGROUND_COMPACTIONS=8
+ OPEN_FILES=16
+ echo deadline
+ ./plugin/zenfs/util/zenfs mkfs --zbd=nullb0 --aux_path=/tmp/zenfs_nullb0 --finish_threshold=0 --force
ZenFS file system created. Free space: 7808 MB
+ ./db_bench --fs_uri=zenfs://nullb0 --key_size=16 --value_size=800 --target_file_size_base=255013682 --write_buffer_size=255013682 --max_bytes_for_level_base=510027364 --max_bytes_for_level_multiplier=4 --use_direct_io_for_flush_and_compaction --num=1500000 --benchmarks=fillrandom,overwrite --max_background_jobs=8 --max_background_compactions=8 --open_files=16
Failed creating env: Invalid argument: Malformed URI: zenfs://nullb0

virtual-zns-doc/README.md

Line 422 in 52ebdea

 ./db_bench --fs_uri=zenfs://$DEV --key_size=16 --value_size=800 --target_file_size_base=$TARGET_FZ_BASE \ 

According to the README.md in the zenfs repository, fs_uri should be zenfs://dev:<zoned block device name> / zenfs://zonefs:<zonefs mountpoint> or zenfs://uuid:<UUID>. I changed the line to --fs_uri=zenfs://dev:nullb0 and it worked.

So maybe run_zenfs.sh needs a small fix...

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