[PATCH v10 0/5] git checkout: optimise away lots of lstat() calls

Changes since version 9

--- patch 1/5 --- bug fix (missed optimisation): If we have track_flags = FL_SYMLINK|FL_DIR, and:

     cache  =>   A/B/C/D/S   (a symlink)
     name   =>   A/B/C       (a directory)

The cache would return with a (cached) FL_DIR result as expected, _but_ it would set the cache to "A/B/C", so we lose some information.

--- patch 4/5 --- bug fix: if we get a match from the cache for the name to invalidate, we reset the cache if we are not allowed to track directories (inside the invalidate_lstat_cache() function).

Kjetil Barvik (5):
  lstat_cache(): more cache effective symlink/directory detection
  lstat_cache(): introduce has_symlink_or_noent_leading_path() function
  lstat_cache(): introduce has_dirs_only_path() function
  lstat_cache(): introduce invalidate_lstat_cache() function
  lstat_cache(): introduce clear_lstat_cache() function

 cache.h        |    4 +
 entry.c        |   34 +++-----
 symlinks.c     |  263 ++++++++++++++++++++++++++++++++++++++++++++++---------
 unpack-trees.c |    4 +-
 4 files changed, 238 insertions(+), 67 deletions(-)