tree 848eeafb722b9269569e94b6cfcdd6a95169fbd3
parent ab74c7b23f3770935016e3eb3ecdf1e42b73efaa
author Theodore Ts'o <tytso@mit.edu> 1594959280 -0400
committer Theodore Ts'o <tytso@mit.edu> 1596823955 -0400

ext4: add prefetch_block_bitmaps mount option

For file systems where we can afford to keep the buddy bitmaps cached,
we can speed up initial writes to large file systems by starting to
load the block allocation bitmaps as soon as the file system is
mounted.  This won't work well for _super_ large file systems, or
memory constrained systems, so we only enable this when it is
requested via a mount option.

Addresses-Google-Bug: 159488342
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>