Christopher Haster d3f3711560 Cleaned up attributes and related logic ...

The biggest change here is to make littlefs less obsessed with the
lfs_mattr_t struct. It was limiting our flexibility and can be entirely
replaced by passing the tag + data explicitly. The remaining use of
lfs_mattr_t is specific to the commit logic, where it replaces the
lfs_mattrlist_t struct.

Other changes:
- Added global lfs_diskoff struct for embedding disk references inside
  the lfs_mattr_t.
- Reordered lfs_mattrlist_t to squeeze out some code savings
- Added commit_get for explicit access to entries from unfinished
  metadata-pairs
- Parameterized the "stop_at_commit" flag instead of hackily storing it
  in the lfs_mdir_t temporarily
- Changed return value of lfs_pred to error-only with ENOENT representing
  a missing predecessor
- Adopted const where possible

2018-10-16 05:03:44 -05:00

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