libext2fs: add ext2fs_block_alloc_stats_range()
This function is more efficient than using ext2fs_block_alloc_stats2()
for each block in a range. The efficiencies come from being able to
set a block range in the block bitmap at once, and from being update
the block group descriptors once per block group. Especially now that
we are checksuming the block group descriptors, and we are using red
black trees for the allocation bitmaps, these changes can make a huge
difference in the CPU time used by mke2fs when creating very large
file systems.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2 files changed