Re: ext4lazyinit reads HDD data on mount since 5.13

On 09.08.2021 04:51, Theodore Ts'o wrote:

It's a new feature which optimizes block allocations for very large
file systems.  The work being done by ext4lazyinit is to read the
block allocation bitmaps so we can cache the buddy bitmaps and how
fragmented (or not) various block groups are, which is used to
optimize the block allocator.

Thanks for the info. To revert old behavior, the filesystem should be 
mounted with -o no_prefetch_block_bitmaps

Is it safe to use this option with new optimizations? Should I expect 
only less optimal filesystem speed and no other issues?