This is a just a mechanical change, renaming and inverting the meaning of the indexing variable. "m_blockfiles_indexed" is a more straightforward name for this variable because this variable just indicates whether or not <datadir>/blocks/blk?????.dat files have been indexed in the <datadir>/blocks/index LevelDB database. The name "m_reindexing" was more confusing, it could be true even if -reindex was not specified, and false when it was specified. Also, the previous name unnecessarily required thinking about the whole reindexing process just to understand simple checks in validation code about whether blocks were indexed. The motivation for this change is to follow up on previous commits, moving away from having multiple variables called "reindex" internally, and instead naming variables individually after what they do and represent.
src/node/
The src/node/ directory contains code that needs to access node state
(state in CChain, CBlockIndex, CCoinsView, CTxMemPool, and similar
classes).
Code in src/node/ is meant to be segregated from code in
src/wallet/ and src/qt/, to ensure wallet and GUI
code changes don't interfere with node operation, to allow wallet and GUI code
to run in separate processes, and to perhaps eventually allow wallet and GUI
code to be maintained in separate source repositories.
As a rule of thumb, code in one of the src/node/,
src/wallet/, or src/qt/ directories should avoid
calling code in the other directories directly, and only invoke it indirectly
through the more limited src/interfaces/ classes.
This directory is at the moment
sparsely populated. Eventually more substantial files like
src/validation.cpp and
src/txmempool.cpp might be moved there.