Hello,
I've noticed that in several places we need to unmap metadata in buffer cache
for a range of blocks and we do it by iterating over all blocks in given range.
Let's provide a helper function for that and implement it in a way more
efficient for larger ranges of blocks. Also cleanup other uses of
unmap_unerlying_metadata(). The patches passed xfstests for ext2 and ext4.
Jens, can you merge these patches if they look fine to you?
Changes since v1:
* Improved comment describing what the function does
* Renamed function
* Added wrapper for single block users and use it
Honza
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