tag-returning: Adopted tag-returnn in mdir lookups

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- lfs3_mdir_lookupnext
- lfs3_mdir_lookup

Like btree lookups, mdir lookups are also tag-inspection heavy, so we
see some nice savings:

           code          stack          ctx
  before: 36520           2352          656
  after:  36348 (-0.5%)   2336 (-0.7%)  656 (+0.0%)

lfs3_mdir_lookup also highlights how tag-returns help reduce API noise
around the tag mask bits. lfs3_mdir_lookup's tag out-pointer doesn't
really make sense with the default non-masked tags, and moving it to the
return position hides it aways a bit.

...

This commit is contained in:

Christopher Haster

2025-07-17 15:44:47 -05:00

parent 100fb66d37

commit bfab282b9e

2 changed files with 551 additions and 368 deletions

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tests/test_mtree.toml

+402 -206

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