Improvements to status performance on Windows.

Changed win32/path_w32.c to utilize NTFS' FindFirst..FindNext data instead of doing an lstat per file. Avoiding unnecessary directory opens and file scans reduces IO, improving overall performance. Effect is magnified due to NTFS being a kernel mode file system (as opposed to user mode).

1 files changed, 27 insertions, 0 deletions

diff --git a/src/win32/path_w32.h b/src/win32/path_w32.h
index 033afbb0f..57ce732d6 100644
--- a/src/win32/path_w32.h
+++ b/src/win32/path_w32.h
@@ -8,6 +8,7 @@
 #define INCLUDE_git_path_w32_h__
 
 #include "common.h"
+#include "vector.h"
 
 /*
  * Provides a large enough buffer to support Windows paths:  MAX_PATH is
@@ -79,4 +80,30 @@ extern int git_win32_path_to_utf8(git_win32_utf8_path dest, const wchar_t *src);
  */
 extern char *git_win32_path_8dot3_name(const char *path);
 
+#if !defined(__MINGW32__)
+/**
+ * Load all directory entries along with stat info into a vector.
+ * Performed in a single pass per directory for optimized performance on Windows.
+ *
+ * This adds four things on top of plain `git_path_dirload`:
+ *
+ * 1. Each entry in the vector is a `git_path_with_stat` struct that
+ *    contains both the path and the stat info
+ * 2. The entries will be sorted alphabetically
+ * 3. Entries that are directories will be suffixed with a '/'
+ * 4. Optionally, you can be a start and end prefix and only elements
+ *    after the start and before the end (inclusively) will be stat'ed.
+ *
+ * @param path The directory to read from
+ * @param prefix_len The trailing part of path to prefix to entry paths
+ * @param flags GIT_PATH_DIR flags from above
+ * @param start_stat As optimization, only stat values after this prefix
+ * @param end_stat As optimization, only stat values before this prefix
+ * @param contents Vector to fill with git_path_with_stat structures
+ */
+extern int git_win32_path_dirload_with_stat(const char *path, size_t prefix_len, unsigned int flags, const char *start_stat, const char *end_stat, git_vector *contents);
+#endif
+
+extern int git_win32_path_readlink_w(git_win32_path dest, const git_win32_path path);
+
 #endif