/sys/fs/ext4/dm-3
Directories:

• /sys/fs/ext4

Files:

• delayed_allocation_blocks
• reserved_clusters
• lifetime_write_kbytes
• max_writeback_mb_bump
• extent_max_zeroout_kb
• mb_min_to_scan
• mb_stream_req
• inode_goal
• first_error_time
• err_ratelimit_burst
• msg_ratelimit_interval_ms
• mb_group_prealloc
• mb_order2_req
• msg_ratelimit_burst
• inode_readahead_blks
• err_ratelimit_interval_ms
• session_write_kbytes
• errors_count
• mb_max_to_scan
• trigger_fs_error
• warning_ratelimit_interval_ms
• warning_ratelimit_burst
• last_error_time
• mb_stats