fscache: make fscache_enabled() public

Make fscache_enabled() function public rather than static.
Remove unneeded fscache_is_enabled() function.
Change is_fscache_enabled() macro to call fscache_enabled().

is_fscache_enabled() now takes a pathname so that the answer
is more precise and mean "is fscache enabled for this pathname",
since fscache only stores repo-relative paths and not absolute
paths, we can avoid attempting lookups for absolute paths.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>

compat/win32/fscache.c

@@ -8,11 +8,6 @@ static volatile long enabled;
 static struct hashmap map;
 static CRITICAL_SECTION mutex;
 
-int fscache_is_enabled(void)
-{
-	return enabled;
-}
-
 /*
  * An entry in the file system cache. Used for both entire directory listings
  * and file entries.
@@ -247,7 +242,7 @@ static void fscache_clear(void)
 /*
  * Checks if the cache is enabled for the given path.
  */
-static inline int fscache_enabled(const char *path)
+int fscache_enabled(const char *path)
 {
 	return enabled > 0 && !is_absolute_path(path);
 }

compat/win32/fscache.h

@@ -4,8 +4,8 @@
 int fscache_enable(int enable);
 #define enable_fscache(x) fscache_enable(x)
 
-int fscache_is_enabled(void);
-#define is_fscache_enabled() (fscache_is_enabled())
+int fscache_enabled(const char *path);
+#define is_fscache_enabled(path) fscache_enabled(path)
 
 DIR *fscache_opendir(const char *dir);
 int fscache_lstat(const char *file_name, struct stat *buf);

dir.c

@@ -786,7 +786,7 @@ static int add_excludes(const char *fname, const char *base, int baselen,
 	size_t size = 0;
 	char *buf;
 
-	if (is_fscache_enabled()) {
+	if (is_fscache_enabled(fname)) {
 		if (lstat(fname, &st) < 0) {
 			fd = -1;
 		} else {

git-compat-util.h

@@ -1284,7 +1284,7 @@ static inline int is_missing_file_error(int errno_)
 #endif
 
 #ifndef is_fscache_enabled
-#define is_fscache_enabled() (0)
+#define is_fscache_enabled(path) (0)
 #endif
 
 extern int cmd_main(int, const char **);