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[PATCH v3 00/20] Separate `ref_cache` into a separate module

This is v3 of a patch series to separate the reference caching code
into a separate module that interacts with `files_ref_cache` more at
arm's length. Thanks to Stefan and Duy for their feedback about v2 [1].

This version has only minor changes since v2 (and indeed since v1 [2]):

* Rebased onto the current nd/files-backend-git-dir (there were no

* Removed redundant assignment in

    refs_verify_refname_available(): implement once for all backends

* Improved two commit messages.

This patch series is also available from my GitHub fork [3] as branch
"separate-ref-cache". These patches depend on Duy's
nd/files-backend-git-dir branch.

[1] http://public-inbox.org/git/cover.1490966385.git.mhagger@xxxxxxxxxxxx/
[2] http://public-inbox.org/git/cover.1490026594.git.mhagger@xxxxxxxxxxxx/
[3] https://github.com/mhagger/git

Michael Haggerty (20):
  get_ref_dir(): don't call read_loose_refs() for "refs/bisect"
  refs_read_raw_ref(): new function
  refs_ref_iterator_begin(): new function
  refs_verify_refname_available(): implement once for all backends
  refs_verify_refname_available(): use function in more places
  ref-cache: rename `add_ref()` to `add_ref_entry()`
  ref-cache: rename `find_ref()` to `find_ref_entry()`
  ref-cache: rename `remove_entry()` to `remove_entry_from_dir()`
  refs: split `ref_cache` code into separate files
  ref-cache: introduce a new type, ref_cache
  refs: record the ref_store in ref_cache, not ref_dir
  ref-cache: use a callback function to fill the cache
  refs: handle "refs/bisect/" in `loose_fill_ref_dir()`
  do_for_each_entry_in_dir(): eliminate `offset` argument
  get_loose_ref_dir(): function renamed from get_loose_refs()
  get_loose_ref_cache(): new function
  cache_ref_iterator_begin(): make function smarter
  commit_packed_refs(): use reference iteration
  files_pack_refs(): use reference iteration
  do_for_each_entry_in_dir(): delete function

 Makefile             |    1 +
 refs.c               |  111 ++++-
 refs.h               |    2 +-
 refs/files-backend.c | 1229 +++++++-------------------------------------------
 refs/ref-cache.c     |  523 +++++++++++++++++++++
 refs/ref-cache.h     |  267 +++++++++++
 refs/refs-internal.h |   22 +-
 7 files changed, 1066 insertions(+), 1089 deletions(-)
 create mode 100644 refs/ref-cache.c
 create mode 100644 refs/ref-cache.h